Add OwnedWindowHandle to avoid lifetime on WindowHandle<'_>

* Use icrate's window structs and enums

* Properly implement protocols

* Use icrate's NSWindow

We were previously using undocumented methods on `NSWindowTabGroup`

* Use icrate's NSApplication

And clean up some doc comments regarding NSApplication

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        toolchain: [stable, nightly, '1.65.0']
+        toolchain: [stable, nightly, '1.70.0']
         platform:
           # Note: Make sure that we test all the `docs.rs` targets defined in Cargo.toml!
           - { name: 'Windows 64bit MSVC', target: x86_64-pc-windows-msvc,   os: windows-latest,  }
@@ -43,10 +43,10 @@ jobs:
           - { name: 'web',                target: wasm32-unknown-unknown,   os: ubuntu-latest,   }
         exclude:
           # Android is tested on stable-3
-          - toolchain: '1.65.0'
+          - toolchain: '1.70.0'
             platform: { name: 'Android', target: aarch64-linux-android, os: ubuntu-latest, options: '--package=winit --features=android-native-activity', cmd: 'apk --' }
         include:
-          - toolchain: '1.69.0'
+          - toolchain: '1.70.0'
             platform: { name: 'Android', target: aarch64-linux-android, os: ubuntu-latest, options: '--package=winit --features=android-native-activity', cmd: 'apk --' }
 
     env:
@@ -120,7 +120,7 @@ jobs:
     - name: Build tests
       if: >
         !contains(matrix.platform.target, 'redox') &&
-        matrix.toolchain != '1.65.0'
+        matrix.toolchain != '1.70.0'
       run: cargo $CMD test --no-run $OPTIONS
 
     - name: Run tests
@@ -129,7 +129,7 @@ jobs:
         !contains(matrix.platform.target, 'ios') &&
         !contains(matrix.platform.target, 'wasm32') &&
         !contains(matrix.platform.target, 'redox') &&
-        matrix.toolchain != '1.65.0'
+        matrix.toolchain != '1.70.0'
       run: cargo $CMD test $OPTIONS
 
     - name: Lint with clippy
@@ -139,7 +139,7 @@ jobs:
     - name: Build tests with serde enabled
       if: >
         !contains(matrix.platform.target, 'redox') &&
-        matrix.toolchain != '1.65.0'
+        matrix.toolchain != '1.70.0'
       run: cargo $CMD test --no-run $OPTIONS --features serde
 
     - name: Run tests with serde enabled
@@ -148,7 +148,7 @@ jobs:
         !contains(matrix.platform.target, 'ios') &&
         !contains(matrix.platform.target, 'wasm32') &&
         !contains(matrix.platform.target, 'redox') &&
-        matrix.toolchain != '1.65.0'
+        matrix.toolchain != '1.70.0'
       run: cargo $CMD test $OPTIONS --features serde
 
     # See restore step above

CHANGELOG.md

@@ -11,37 +11,18 @@ Unreleased` header.
 
 # Unreleased
 
-# 0.29.10
-
-- On Web, account for canvas being focused already before event loop starts.
-- On Web, increase cursor position accuracy.
-
-# 0.29.9
-
-- On X11, fix `NotSupported` error not propagated when creating event loop.
-- On Wayland, fix resize not issued when scale changes
-- On X11 and Wayland, fix arrow up on keypad reported as `ArrowLeft`.
-- On macOS, report correct logical key when Ctrl or Cmd is pressed.
-
-# 0.29.8
-
-- On X11, fix IME input lagging behind.
-- On X11, fix `ModifiersChanged` not sent from xdotool-like input
-- On X11, fix keymap not updated from xmodmap.
-- On X11, reduce the amount of time spent fetching screen resources.
-- On Wayland, fix `Window::request_inner_size` being overwritten by resize.
-- On Wayland, fix `Window::inner_size` not using the correct rounding.
-
-# 0.29.7
-
-- On X11, fix `Xft.dpi` reload during runtime.
-- On X11, fix window minimize.
-
-# 0.29.6
-
+- On Windows, macOS, X11, Wayland and Web, implement setting images as cursors. See the `custom_cursors.rs` example.
+  - Add `Window::set_custom_cursor`
+  - Add `CustomCursor`
+  - Add `CustomCursor::from_rgba` to allow creating cursor images from RGBA data.
+  - Add `CustomCursorExtWebSys::from_url` to allow loading cursor images from URLs.
+- On macOS, add services menu.
+- **Breaking:** On Web, remove queuing fullscreen request in absence of transient activation.
+- On Web, fix setting cursor icon overriding cursor visibility.
 - On Web, fix context menu not being disabled by `with_prevent_default(true)`.
-- On Wayland, fix `WindowEvent::Destroyed` not being delivered after destroying window.
-- Fix `EventLoopExtRunOnDemand::run_on_demand` not working for consequent invocation
+- **Breaking:** On Web, return `RawWindowHandle::WebCanvas` instead of `RawWindowHandle::Web`.
+- **Breaking:** On Web, macOS and iOS, return `HandleError::Unavailable` when a window handle is not available.
+- **Breaking:** Bump MSRV from `1.65` to `1.70`.
 
 # 0.29.5
 

CONTRIBUTING.md

@@ -20,7 +20,7 @@ your description of the issue as detailed as possible:
 
 When making a code contribution to winit, before opening your pull request, please make sure that:
 
-- your patch builds with Winit's minimal supported rust version - Rust 1.65.
+- your patch builds with Winit's minimal supported rust version - Rust 1.70.
 - you tested your modifications on all the platforms impacted, or if not possible, detail which platforms
   were not tested, and what should be tested, so that a maintainer or another contributor can test them
 - you updated any relevant documentation in winit

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "winit"
-version = "0.29.10"
+version = "0.29.5"
 authors = ["The winit contributors", "Pierre Krieger <pierre.krieger1708@gmail.com>"]
 description = "Cross-platform window creation library."
 edition = "2021"
@@ -10,7 +10,7 @@ readme = "README.md"
 repository = "https://github.com/rust-windowing/winit"
 documentation = "https://docs.rs/winit"
 categories = ["gui"]
-rust-version = "1.65.0"
+rust-version = "1.70.0"
 
 [package.metadata.docs.rs]
 features = [
@@ -66,7 +66,7 @@ log = "0.4"
 mint = { version = "0.5.6", optional = true }
 once_cell = "1.12"
 rwh_04 = { package = "raw-window-handle", version = "0.4", optional = true }
-rwh_05 = { package = "raw-window-handle", version = "0.5.2", features = ["std"], optional = true }
+rwh_05 = { package = "raw-window-handle", version = "0.5", features = ["std"], optional = true }
 rwh_06 = { package = "raw-window-handle", version = "0.6", features = ["std"], optional = true }
 serde = { version = "1", optional = true, features = ["serde_derive"] }
 smol_str = "0.2.0"
@@ -86,13 +86,13 @@ ndk-sys = "0.5.0"
 
 [target.'cfg(any(target_os = "ios", target_os = "macos"))'.dependencies]
 core-foundation = "0.9.3"
-objc2 = "0.4.1"
+objc2 = "0.5.0"
 
 [target.'cfg(target_os = "macos")'.dependencies]
 core-graphics = "0.23.1"
 
 [target.'cfg(target_os = "macos")'.dependencies.icrate]
-version = "0.0.4"
+version = "0.1.0"
 features = [
     "dispatch",
     "Foundation",
@@ -105,10 +105,31 @@ features = [
     "Foundation_NSProcessInfo",
     "Foundation_NSThread",
     "Foundation_NSNumber",
+    "AppKit",
+    "AppKit_NSAppearance",
+    "AppKit_NSApplication",
+    "AppKit_NSBitmapImageRep",
+    "AppKit_NSButton",
+    "AppKit_NSColor",
+    "AppKit_NSControl",
+    "AppKit_NSCursor",
+    "AppKit_NSEvent",
+    "AppKit_NSGraphicsContext",
+    "AppKit_NSImage",
+    "AppKit_NSImageRep",
+    "AppKit_NSMenu",
+    "AppKit_NSMenuItem",
+    "AppKit_NSPasteboard",
+    "AppKit_NSResponder",
+    "AppKit_NSScreen",
+    "AppKit_NSTextInputContext",
+    "AppKit_NSView",
+    "AppKit_NSWindow",
+    "AppKit_NSWindowTabGroup",
 ]
 
 [target.'cfg(target_os = "ios")'.dependencies.icrate]
-version = "0.0.4"
+version = "0.1.0"
 features = [
     "dispatch",
     "Foundation",
@@ -179,6 +200,7 @@ version = "0.3.64"
 features = [
     'AbortController',
     'AbortSignal',
+    'Blob',
     'console',
     'CssStyleDeclaration',
     'Document',
@@ -190,6 +212,11 @@ features = [
     'FocusEvent',
     'HtmlCanvasElement',
     'HtmlElement',
+    'HtmlImageElement',
+    'ImageBitmap',
+    'ImageBitmapOptions',
+    'ImageBitmapRenderingContext',
+    'ImageData',
     'IntersectionObserver',
     'IntersectionObserverEntry',
     'KeyboardEvent',
@@ -199,6 +226,7 @@ features = [
     'Node',
     'PageTransitionEvent',
     'PointerEvent',
+    'PremultiplyAlpha',
     'ResizeObserver',
     'ResizeObserverBoxOptions',
     'ResizeObserverEntry',
@@ -206,7 +234,8 @@ features = [
     'ResizeObserverSize',
     'VisibilityState',
     'Window',
-    'WheelEvent'
+    'WheelEvent',
+    'Url',
 ]
 
 [target.'cfg(target_family = "wasm")'.dependencies]

FEATURES.md

@@ -106,6 +106,7 @@ If your PR makes notable changes to Winit's features, please update this section
 - **Cursor locking**: Locking the cursor inside the window so it cannot move.
 - **Cursor confining**: Confining the cursor to the window bounds so it cannot leave them.
 - **Cursor icon**: Changing the cursor icon or hiding the cursor.
+- **Cursor image**: Changing the cursor to your own image.
 - **Cursor hittest**: Handle or ignore mouse events for a window.
 - **Touch events**: Single-touch events.
 - **Touch pressure**: Touch events contain information about the amount of force being applied.
@@ -206,6 +207,7 @@ Legend:
 |Cursor locking          |❌       |✔️      |❌       |✔️          |**N/A**|**N/A**|✔️        |❌      |
 |Cursor confining        |✔️       |❌      |✔️       |✔️          |**N/A**|**N/A**|❌       |❌      |
 |Cursor icon             |✔️       |✔️      |✔️       |✔️          |**N/A**|**N/A**|✔️        |**N/A** |
+|Cursor image            |✔️       |✔️      |✔️       |✔️          |**N/A**|**N/A**|✔️        |**N/A** |
 |Cursor hittest          |✔️       |✔️      |✔️       |✔️          |**N/A**|**N/A**|❌        |❌      |
 |Touch events            |✔️       |❌      |✔️       |✔️          |✔️    |✔️     |✔️        |**N/A** |
 |Touch pressure          |✔️       |❌      |❌       |❌          |❌    |✔️     |✔️        |**N/A** |

README.md

@@ -6,7 +6,7 @@
 
 ```toml
 [dependencies]
-winit = "0.29.10"
+winit = "0.29.5"
 ```
 
 ## [Documentation](https://docs.rs/winit)
@@ -42,7 +42,7 @@ Winit provides the following features, which can be enabled in your `Cargo.toml`
 
 ## MSRV Policy
 
-This crate's Minimum Supported Rust Version (MSRV) is **1.65**. Changes to
+This crate's Minimum Supported Rust Version (MSRV) is **1.70**. Changes to
 the MSRV will be accompanied by a minor version bump.
 
 As a **tentative** policy, the upper bound of the MSRV is given by the following
@@ -156,7 +156,7 @@ For more details, refer to these `android-activity` [example applications](https
 
 If your application is currently based on `NativeActivity` via the `ndk-glue` crate and building with `cargo apk`, then the minimal changes would be:
 1. Remove `ndk-glue` from your `Cargo.toml`
-2. Enable the `"android-native-activity"` feature for Winit: `winit = { version = "0.29.10", features = [ "android-native-activity" ] }`
+2. Enable the `"android-native-activity"` feature for Winit: `winit = { version = "0.29.5", features = [ "android-native-activity" ] }`
 3. Add an `android_main` entrypoint (as above), instead of using the '`[ndk_glue::main]` proc macro from `ndk-macros` (optionally add a dependency on `android_logger` and initialize logging as above).
 4. Pass a clone of the `AndroidApp` that your application receives to Winit when building your event loop (as shown above).
 

clippy.toml

@@ -6,6 +6,7 @@ disallowed-methods = [
     { path = "web_sys::HtmlCanvasElement::set_height", reason = "Winit shouldn't touch the internal canvas size" },
     { path = "web_sys::Window::document", reason = "cache this to reduce calls to JS" },
     { path = "web_sys::Window::get_computed_style", reason = "cache this to reduce calls to JS" },
+    { path = "web_sys::HtmlElement::style", reason = "cache this to reduce calls to JS" },
     { path = "web_sys::Element::request_fullscreen", reason = "Doesn't account for compatibility with Safari" },
     { path = "web_sys::Document::exit_fullscreen", reason = "Doesn't account for compatibility with Safari" },
     { path = "web_sys::Document::fullscreen_element", reason = "Doesn't account for compatibility with Safari" },

examples/child_window.rs

@@ -17,7 +17,7 @@ fn main() -> Result<(), impl std::error::Error> {
         dpi::{LogicalPosition, LogicalSize, Position},
         event::{ElementState, Event, KeyEvent, WindowEvent},
         event_loop::{EventLoop, EventLoopWindowTarget},
-        raw_window_handle::HasRawWindowHandle,
+        raw_window_handle::HasWindowHandle,
         window::{Window, WindowBuilder, WindowId},
     };
 
@@ -26,14 +26,13 @@ fn main() -> Result<(), impl std::error::Error> {
         event_loop: &EventLoopWindowTarget<()>,
         windows: &mut HashMap<WindowId, Window>,
     ) {
-        let parent = parent.raw_window_handle().unwrap();
+        let parent = parent.window_handle().unwrap();
         let mut builder = WindowBuilder::new()
             .with_title("child window")
             .with_inner_size(LogicalSize::new(200.0f32, 200.0f32))
             .with_position(Position::Logical(LogicalPosition::new(0.0, 0.0)))
             .with_visible(true);
-        // `with_parent_window` is unsafe. Parent window must be a valid window.
-        builder = unsafe { builder.with_parent_window(Some(parent)) };
+        builder = builder.with_parent_window(Some(parent));
         let child_window = builder.build(event_loop).unwrap();
 
         let id = child_window.id();

examples/custom_cursors.rs

@@ -0,0 +1,94 @@
+#![allow(clippy::single_match, clippy::disallowed_methods)]
+
+#[cfg(not(wasm_platform))]
+use simple_logger::SimpleLogger;
+use winit::{
+    event::{ElementState, Event, KeyEvent, WindowEvent},
+    event_loop::{EventLoop, EventLoopWindowTarget},
+    keyboard::Key,
+    window::{CustomCursor, WindowBuilder},
+};
+
+fn decode_cursor<T>(bytes: &[u8], window_target: &EventLoopWindowTarget<T>) -> CustomCursor {
+    let img = image::load_from_memory(bytes).unwrap().to_rgba8();
+    let samples = img.into_flat_samples();
+    let (_, w, h) = samples.extents();
+    let (w, h) = (w as u16, h as u16);
+    let builder = CustomCursor::from_rgba(samples.samples, w, h, w / 2, h / 2).unwrap();
+
+    builder.build(window_target)
+}
+
+#[cfg(not(wasm_platform))]
+#[path = "util/fill.rs"]
+mod fill;
+
+fn main() -> Result<(), impl std::error::Error> {
+    #[cfg(not(wasm_platform))]
+    SimpleLogger::new()
+        .with_level(log::LevelFilter::Info)
+        .init()
+        .unwrap();
+    #[cfg(wasm_platform)]
+    console_log::init_with_level(log::Level::Debug).unwrap();
+
+    let event_loop = EventLoop::new().unwrap();
+    let builder = WindowBuilder::new().with_title("A fantastic window!");
+    #[cfg(wasm_platform)]
+    let builder = {
+        use winit::platform::web::WindowBuilderExtWebSys;
+        builder.with_append(true)
+    };
+    let window = builder.build(&event_loop).unwrap();
+
+    let mut cursor_idx = 0;
+    let mut cursor_visible = true;
+
+    let custom_cursors = [
+        decode_cursor(include_bytes!("data/cross.png"), &event_loop),
+        decode_cursor(include_bytes!("data/cross2.png"), &event_loop),
+    ];
+
+    event_loop.run(move |event, _elwt| match event {
+        Event::WindowEvent { event, .. } => match event {
+            WindowEvent::KeyboardInput {
+                event:
+                    KeyEvent {
+                        state: ElementState::Pressed,
+                        logical_key: key,
+                        ..
+                    },
+                ..
+            } => match key.as_ref() {
+                Key::Character("1") => {
+                    log::debug!("Setting cursor to {:?}", cursor_idx);
+                    window.set_custom_cursor(&custom_cursors[cursor_idx]);
+                    cursor_idx = (cursor_idx + 1) % 2;
+                }
+                Key::Character("2") => {
+                    log::debug!("Setting cursor icon to default");
+                    window.set_cursor_icon(Default::default());
+                }
+                Key::Character("3") => {
+                    cursor_visible = !cursor_visible;
+                    log::debug!("Setting cursor visibility to {:?}", cursor_visible);
+                    window.set_cursor_visible(cursor_visible);
+                }
+                _ => {}
+            },
+            WindowEvent::RedrawRequested => {
+                #[cfg(not(wasm_platform))]
+                fill::fill_window(&window);
+            }
+            WindowEvent::CloseRequested => {
+                #[cfg(not(wasm_platform))]
+                _elwt.exit();
+            }
+            _ => (),
+        },
+        Event::AboutToWait => {
+            window.request_redraw();
+        }
+        _ => {}
+    })
+}

examples/util/fill.rs

@@ -7,30 +7,17 @@
 //! The `softbuffer` crate is used, largely because of its ease of use. `glutin` or `wgpu` could
 //! also be used to fill the window buffer, but they are more complicated to use.
 
-#[allow(unused_imports)]
-pub use platform::cleanup_window;
-pub use platform::fill_window;
+use winit::window::Window;
 
 #[cfg(all(feature = "rwh_05", not(any(target_os = "android", target_os = "ios"))))]
-mod platform {
+pub(super) fn fill_window(window: &Window) {
+    use softbuffer::{Context, Surface};
     use std::cell::RefCell;
     use std::collections::HashMap;
     use std::mem::ManuallyDrop;
     use std::num::NonZeroU32;
-
-    use softbuffer::{Context, Surface};
-    use winit::window::Window;
     use winit::window::WindowId;
 
-    thread_local! {
-        // NOTE: You should never do things like that, create context and drop it before
-        // you drop the event loop. We do this for brevity to not blow up examples. We use
-        // ManuallyDrop to prevent destructors from running.
-        //
-        // A static, thread-local map of graphics contexts to open windows.
-        static GC: ManuallyDrop<RefCell<Option<GraphicsContext>>> = ManuallyDrop::new(RefCell::new(None));
-    }
-
     /// The graphics context used to draw to a window.
     struct GraphicsContext {
         /// The global softbuffer context.
@@ -48,69 +35,55 @@ mod platform {
             }
         }
 
-        fn create_surface(&mut self, window: &Window) -> &mut Surface {
-            self.surfaces.entry(window.id()).or_insert_with(|| {
-                unsafe { Surface::new(&self.context, window) }
+        fn surface(&mut self, w: &Window) -> &mut Surface {
+            self.surfaces.entry(w.id()).or_insert_with(|| {
+                unsafe { Surface::new(&self.context, w) }
                     .expect("Failed to create a softbuffer surface")
             })
         }
-
-        fn destroy_surface(&mut self, window: &Window) {
-            self.surfaces.remove(&window.id());
-        }
     }
 
-    pub fn fill_window(window: &Window) {
-        GC.with(|gc| {
-            let size = window.inner_size();
-            let (Some(width), Some(height)) =
-                (NonZeroU32::new(size.width), NonZeroU32::new(size.height))
-            else {
-                return;
-            };
-
-            // Either get the last context used or create a new one.
-            let mut gc = gc.borrow_mut();
-            let surface = gc
-                .get_or_insert_with(|| GraphicsContext::new(window))
-                .create_surface(window);
-
-            // Fill a buffer with a solid color.
-            const DARK_GRAY: u32 = 0xFF181818;
-
-            surface
-                .resize(width, height)
-                .expect("Failed to resize the softbuffer surface");
-
-            let mut buffer = surface
-                .buffer_mut()
-                .expect("Failed to get the softbuffer buffer");
-            buffer.fill(DARK_GRAY);
-            buffer
-                .present()
-                .expect("Failed to present the softbuffer buffer");
-        })
+    thread_local! {
+        // NOTE: You should never do things like that, create context and drop it before
+        // you drop the event loop. We do this for brevity to not blow up examples. We use
+        // ManuallyDrop to prevent destructors from running.
+        //
+        // A static, thread-local map of graphics contexts to open windows.
+        static GC: ManuallyDrop<RefCell<Option<GraphicsContext>>> = ManuallyDrop::new(RefCell::new(None));
     }
 
-    #[allow(dead_code)]
-    pub fn cleanup_window(window: &Window) {
-        GC.with(|gc| {
-            let mut gc = gc.borrow_mut();
-            if let Some(context) = gc.as_mut() {
-                context.destroy_surface(window);
-            }
-        });
-    }
+    GC.with(|gc| {
+        let size = window.inner_size();
+        let (Some(width), Some(height)) =
+            (NonZeroU32::new(size.width), NonZeroU32::new(size.height))
+        else {
+            return;
+        };
+
+        // Either get the last context used or create a new one.
+        let mut gc = gc.borrow_mut();
+        let surface = gc
+            .get_or_insert_with(|| GraphicsContext::new(window))
+            .surface(window);
+
+        // Fill a buffer with a solid color.
+        const DARK_GRAY: u32 = 0xFF181818;
+
+        surface
+            .resize(width, height)
+            .expect("Failed to resize the softbuffer surface");
+
+        let mut buffer = surface
+            .buffer_mut()
+            .expect("Failed to get the softbuffer buffer");
+        buffer.fill(DARK_GRAY);
+        buffer
+            .present()
+            .expect("Failed to present the softbuffer buffer");
+    })
 }
 
 #[cfg(not(all(feature = "rwh_05", not(any(target_os = "android", target_os = "ios")))))]
-mod platform {
-    pub fn fill_window(_window: &winit::window::Window) {
-        // No-op on mobile platforms.
-    }
-
-    #[allow(dead_code)]
-    pub fn cleanup_window(_window: &winit::window::Window) {
-        // No-op on mobile platforms.
-    }
+pub(super) fn fill_window(_window: &Window) {
+    // No-op on mobile platforms.
 }

examples/window_on_demand.rs

@@ -40,7 +40,6 @@ fn main() -> Result<(), impl std::error::Error> {
                         window_id,
                     } if window.id() == window_id => {
                         println!("--------------------------------------------------------- Window {idx} CloseRequested");
-                        fill::cleanup_window(window);
                         app.window = None;
                     }
                     Event::AboutToWait => window.request_redraw(),

src/cursor.rs

@@ -0,0 +1,278 @@
+use core::fmt;
+use std::hash::Hasher;
+use std::sync::Arc;
+use std::{error::Error, hash::Hash};
+
+use crate::event_loop::EventLoopWindowTarget;
+use crate::platform_impl::{self, PlatformCustomCursor, PlatformCustomCursorBuilder};
+
+/// The maximum width and height for a cursor when using [`CustomCursor::from_rgba`].
+pub const MAX_CURSOR_SIZE: u16 = 2048;
+
+const PIXEL_SIZE: usize = 4;
+
+/// Use a custom image as a cursor (mouse pointer).
+///
+/// ## Platform-specific
+///
+/// **Web**: Some browsers have limits on cursor sizes usually at 128x128.
+///
+/// # Example
+///
+/// ```no_run
+/// use winit::{
+///     event::{Event, WindowEvent},
+///     event_loop::{ControlFlow, EventLoop},
+///     window::{CustomCursor, Window},
+/// };
+///
+/// let mut event_loop = EventLoop::new().unwrap();
+///
+/// let w = 10;
+/// let h = 10;
+/// let rgba = vec![255; (w * h * 4) as usize];
+///
+/// #[cfg(not(target_family = "wasm"))]
+/// let builder = CustomCursor::from_rgba(rgba, w, h, w / 2, h / 2).unwrap();
+///
+/// #[cfg(target_family = "wasm")]
+/// let builder = {
+///     use winit::platform::web::CustomCursorExtWebSys;
+///     CustomCursor::from_url(String::from("http://localhost:3000/cursor.png"), 0, 0)
+/// };
+///
+/// let custom_cursor = builder.build(&event_loop);
+///
+/// let window = Window::new(&event_loop).unwrap();
+/// window.set_custom_cursor(&custom_cursor);
+/// ```
+#[derive(Clone, Debug, Eq, Hash, PartialEq)]
+pub struct CustomCursor {
+    /// Platforms should make sure this is cheap to clone.
+    pub(crate) inner: PlatformCustomCursor,
+}
+
+impl CustomCursor {
+    /// Creates a new cursor from an rgba buffer.
+    ///
+    /// ## Platform-specific
+    ///
+    /// - **Web:** Setting cursor could be delayed due to the creation of `Blob` objects,
+    ///   which are async by nature.
+    pub fn from_rgba(
+        rgba: impl Into<Vec<u8>>,
+        width: u16,
+        height: u16,
+        hotspot_x: u16,
+        hotspot_y: u16,
+    ) -> Result<CustomCursorBuilder, BadImage> {
+        Ok(CustomCursorBuilder {
+            inner: PlatformCustomCursorBuilder::from_rgba(
+                rgba.into(),
+                width,
+                height,
+                hotspot_x,
+                hotspot_y,
+            )?,
+        })
+    }
+}
+
+/// Builds a [`CustomCursor`].
+///
+/// See [`CustomCursor`] for more details.
+#[derive(Debug)]
+pub struct CustomCursorBuilder {
+    pub(crate) inner: PlatformCustomCursorBuilder,
+}
+
+impl CustomCursorBuilder {
+    pub fn build<T>(self, window_target: &EventLoopWindowTarget<T>) -> CustomCursor {
+        CustomCursor {
+            inner: PlatformCustomCursor::build(self.inner, &window_target.p),
+        }
+    }
+}
+
+/// An error produced when using [`CustomCursor::from_rgba`] with invalid arguments.
+#[derive(Debug, Clone)]
+pub enum BadImage {
+    /// Produced when the image dimensions are larger than [`MAX_CURSOR_SIZE`]. This doesn't
+    /// guarantee that the cursor will work, but should avoid many platform and device specific
+    /// limits.
+    TooLarge { width: u16, height: u16 },
+    /// Produced when the length of the `rgba` argument isn't divisible by 4, thus `rgba` can't be
+    /// safely interpreted as 32bpp RGBA pixels.
+    ByteCountNotDivisibleBy4 { byte_count: usize },
+    /// Produced when the number of pixels (`rgba.len() / 4`) isn't equal to `width * height`.
+    /// At least one of your arguments is incorrect.
+    DimensionsVsPixelCount {
+        width: u16,
+        height: u16,
+        width_x_height: u64,
+        pixel_count: u64,
+    },
+    /// Produced when the hotspot is outside the image bounds
+    HotspotOutOfBounds {
+        width: u16,
+        height: u16,
+        hotspot_x: u16,
+        hotspot_y: u16,
+    },
+}
+
+impl fmt::Display for BadImage {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            BadImage::TooLarge { width, height } => write!(f,
+                "The specified dimensions ({width:?}x{height:?}) are too large. The maximum is {MAX_CURSOR_SIZE:?}x{MAX_CURSOR_SIZE:?}.",
+            ),
+            BadImage::ByteCountNotDivisibleBy4 { byte_count } => write!(f,
+                "The length of the `rgba` argument ({byte_count:?}) isn't divisible by 4, making it impossible to interpret as 32bpp RGBA pixels.",
+            ),
+            BadImage::DimensionsVsPixelCount {
+                width,
+                height,
+                width_x_height,
+                pixel_count,
+            } => write!(f,
+                "The specified dimensions ({width:?}x{height:?}) don't match the number of pixels supplied by the `rgba` argument ({pixel_count:?}). For those dimensions, the expected pixel count is {width_x_height:?}.",
+            ),
+            BadImage::HotspotOutOfBounds {
+                width,
+                height,
+                hotspot_x,
+                hotspot_y,
+            } => write!(f,
+                "The specified hotspot ({hotspot_x:?}, {hotspot_y:?}) is outside the image bounds ({width:?}x{height:?}).",
+            ),
+        }
+    }
+}
+
+impl Error for BadImage {}
+
+/// Platforms export this directly as `PlatformCustomCursorBuilder` if they need to only work with images.
+#[derive(Debug)]
+pub(crate) struct OnlyCursorImageBuilder(pub(crate) CursorImage);
+
+#[allow(dead_code)]
+impl OnlyCursorImageBuilder {
+    pub(crate) fn from_rgba(
+        rgba: Vec<u8>,
+        width: u16,
+        height: u16,
+        hotspot_x: u16,
+        hotspot_y: u16,
+    ) -> Result<Self, BadImage> {
+        CursorImage::from_rgba(rgba, width, height, hotspot_x, hotspot_y).map(Self)
+    }
+}
+
+/// Platforms export this directly as `PlatformCustomCursor` if they don't implement caching.
+#[derive(Debug, Clone)]
+pub(crate) struct OnlyCursorImage(pub(crate) Arc<CursorImage>);
+
+impl Hash for OnlyCursorImage {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        Arc::as_ptr(&self.0).hash(state);
+    }
+}
+
+impl PartialEq for OnlyCursorImage {
+    fn eq(&self, other: &Self) -> bool {
+        Arc::ptr_eq(&self.0, &other.0)
+    }
+}
+
+impl Eq for OnlyCursorImage {}
+
+#[allow(dead_code)]
+impl OnlyCursorImage {
+    fn build<T>(
+        builder: OnlyCursorImageBuilder,
+        _: &platform_impl::EventLoopWindowTarget<T>,
+    ) -> Self {
+        Self(Arc::new(builder.0))
+    }
+}
+
+#[derive(Debug)]
+#[allow(dead_code)]
+pub(crate) struct CursorImage {
+    pub(crate) rgba: Vec<u8>,
+    pub(crate) width: u16,
+    pub(crate) height: u16,
+    pub(crate) hotspot_x: u16,
+    pub(crate) hotspot_y: u16,
+}
+
+impl CursorImage {
+    pub(crate) fn from_rgba(
+        rgba: Vec<u8>,
+        width: u16,
+        height: u16,
+        hotspot_x: u16,
+        hotspot_y: u16,
+    ) -> Result<Self, BadImage> {
+        if width > MAX_CURSOR_SIZE || height > MAX_CURSOR_SIZE {
+            return Err(BadImage::TooLarge { width, height });
+        }
+
+        if rgba.len() % PIXEL_SIZE != 0 {
+            return Err(BadImage::ByteCountNotDivisibleBy4 {
+                byte_count: rgba.len(),
+            });
+        }
+
+        let pixel_count = (rgba.len() / PIXEL_SIZE) as u64;
+        let width_x_height = width as u64 * height as u64;
+        if pixel_count != width_x_height {
+            return Err(BadImage::DimensionsVsPixelCount {
+                width,
+                height,
+                width_x_height,
+                pixel_count,
+            });
+        }
+
+        if hotspot_x >= width || hotspot_y >= height {
+            return Err(BadImage::HotspotOutOfBounds {
+                width,
+                height,
+                hotspot_x,
+                hotspot_y,
+            });
+        }
+
+        Ok(CursorImage {
+            rgba,
+            width,
+            height,
+            hotspot_x,
+            hotspot_y,
+        })
+    }
+}
+
+// Platforms that don't support cursors will export this as `PlatformCustomCursor`.
+#[derive(Debug, Clone, Hash, PartialEq, Eq)]
+pub(crate) struct NoCustomCursor;
+
+#[allow(dead_code)]
+impl NoCustomCursor {
+    pub(crate) fn from_rgba(
+        rgba: Vec<u8>,
+        width: u16,
+        height: u16,
+        hotspot_x: u16,
+        hotspot_y: u16,
+    ) -> Result<Self, BadImage> {
+        CursorImage::from_rgba(rgba, width, height, hotspot_x, hotspot_y)?;
+        Ok(Self)
+    }
+
+    fn build<T>(self, _: &platform_impl::EventLoopWindowTarget<T>) -> NoCustomCursor {
+        self
+    }
+}

src/lib.rs

@@ -172,6 +172,7 @@ extern crate bitflags;
 pub mod dpi;
 #[macro_use]
 pub mod error;
+mod cursor;
 pub mod event;
 pub mod event_loop;
 mod icon;

src/platform/macos.rs

@@ -1,5 +1,6 @@
 use std::os::raw::c_void;
 
+use icrate::Foundation::MainThreadMarker;
 use objc2::rc::Id;
 
 use crate::{
@@ -365,7 +366,9 @@ impl MonitorHandleExtMacOS for MonitorHandle {
     }
 
     fn ns_screen(&self) -> Option<*mut c_void> {
-        self.inner.ns_screen().map(|s| Id::as_ptr(&s) as _)
+        // SAFETY: We only use the marker to get a pointer
+        let mtm = unsafe { MainThreadMarker::new_unchecked() };
+        self.inner.ns_screen(mtm).map(|s| Id::as_ptr(&s) as _)
     }
 }
 

src/platform/pump_events.rs

@@ -155,19 +155,19 @@ pub trait EventLoopExtPumpEvents {
     /// - **Windows**: The implementation will use `PeekMessage` when checking for
     ///   window messages to avoid blocking your external event loop.
     ///
-    /// - **MacOS**: The implementation works in terms of stopping the global `NSApp`
+    /// - **MacOS**: The implementation works in terms of stopping the global application
     ///   whenever the application `RunLoop` indicates that it is preparing to block
     ///   and wait for new events.
     ///
     ///   This is very different to the polling APIs that are available on other
     ///   platforms (the lower level polling primitives on MacOS are private
-    ///   implementation details for `NSApp` which aren't accessible to application
-    ///   developers)
+    ///   implementation details for `NSApplication` which aren't accessible to
+    ///   application developers)
     ///
     ///   It's likely this will be less efficient than polling on other OSs and
-    ///   it also means the `NSApp` is stopped while outside of the Winit
+    ///   it also means the `NSApplication` is stopped while outside of the Winit
     ///   event loop - and that's observable (for example to crates like `rfd`)
-    ///   because the `NSApp` is global state.
+    ///   because the `NSApplication` is global state.
     ///
     ///   If you render outside of Winit you are likely to see window resizing artifacts
     ///   since MacOS expects applications to render synchronously during any `drawRect`

src/platform/run_on_demand.rs

@@ -76,14 +76,6 @@ impl<T> EventLoopExtRunOnDemand for EventLoop<T> {
     where
         F: FnMut(Event<Self::UserEvent>, &EventLoopWindowTarget<Self::UserEvent>),
     {
-        self.event_loop.window_target().clear_exit();
         self.event_loop.run_on_demand(event_handler)
     }
 }
-
-impl<T> EventLoopWindowTarget<T> {
-    /// Clear exit status.
-    pub(crate) fn clear_exit(&self) {
-        self.p.clear_exit()
-    }
-}

src/platform/web.rs

@@ -27,9 +27,12 @@
 //! [`border`]: https://developer.mozilla.org/en-US/docs/Web/CSS/border
 //! [`padding`]: https://developer.mozilla.org/en-US/docs/Web/CSS/padding
 
+use crate::cursor::CustomCursorBuilder;
 use crate::event::Event;
 use crate::event_loop::EventLoop;
 use crate::event_loop::EventLoopWindowTarget;
+use crate::platform_impl::PlatformCustomCursorBuilder;
+use crate::window::CustomCursor;
 use crate::window::{Window, WindowBuilder};
 use crate::SendSyncWrapper;
 
@@ -200,3 +203,24 @@ pub enum PollStrategy {
     #[default]
     Scheduler,
 }
+
+pub trait CustomCursorExtWebSys {
+    /// Creates a new cursor from a URL pointing to an image.
+    /// It uses the [url css function](https://developer.mozilla.org/en-US/docs/Web/CSS/url),
+    /// but browser support for image formats is inconsistent. Using [PNG] is recommended.
+    ///
+    /// [PNG]: https://en.wikipedia.org/wiki/PNG
+    fn from_url(url: String, hotspot_x: u16, hotspot_y: u16) -> CustomCursorBuilder;
+}
+
+impl CustomCursorExtWebSys for CustomCursor {
+    fn from_url(url: String, hotspot_x: u16, hotspot_y: u16) -> CustomCursorBuilder {
+        CustomCursorBuilder {
+            inner: PlatformCustomCursorBuilder::Url {
+                url,
+                hotspot_x,
+                hotspot_y,
+            },
+        }
+    }
+}

src/platform_impl/android/mod.rs

@@ -713,10 +713,6 @@ impl<T: 'static> EventLoopWindowTarget<T> {
         self.exit.set(true)
     }
 
-    pub(crate) fn clear_exit(&self) {
-        self.exit.set(false)
-    }
-
     pub(crate) fn exiting(&self) -> bool {
         self.exit.get()
     }
@@ -755,6 +751,18 @@ impl DeviceId {
 #[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
 pub struct PlatformSpecificWindowBuilderAttributes;
 
+#[derive(Debug, Clone)]
+pub(crate) struct OwnedWindowHandle {}
+
+impl OwnedWindowHandle {
+    #[cfg(feature = "rwh_06")]
+    pub(crate) fn new_parent_window(_handle: rwh_06::WindowHandle<'_>) -> Self {
+        // Parent windows are currently unsupported, though owned window
+        // handles would be implementable.
+        Self {}
+    }
+}
+
 pub(crate) struct Window {
     app: AndroidApp,
     redraw_requester: RedrawRequester,
@@ -910,6 +918,8 @@ impl Window {
 
     pub fn set_cursor_icon(&self, _: window::CursorIcon) {}
 
+    pub(crate) fn set_custom_cursor(&self, _: PlatformCustomCursor) {}
+
     pub fn set_cursor_position(&self, _: Position) -> Result<(), error::ExternalError> {
         Err(error::ExternalError::NotSupported(
             error::NotSupportedError::new(),
@@ -1035,6 +1045,8 @@ impl Display for OsError {
     }
 }
 
+pub(crate) use crate::cursor::NoCustomCursor as PlatformCustomCursor;
+pub(crate) use crate::cursor::NoCustomCursor as PlatformCustomCursorBuilder;
 pub(crate) use crate::icon::NoIcon as PlatformIcon;
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]

src/platform_impl/ios/mod.rs

@@ -73,10 +73,12 @@ pub(crate) use self::{
         EventLoop, EventLoopProxy, EventLoopWindowTarget, PlatformSpecificEventLoopAttributes,
     },
     monitor::{MonitorHandle, VideoMode},
-    window::{PlatformSpecificWindowBuilderAttributes, Window, WindowId},
+    window::{OwnedWindowHandle, PlatformSpecificWindowBuilderAttributes, Window, WindowId},
 };
 
 use self::uikit::UIScreen;
+pub(crate) use crate::cursor::NoCustomCursor as PlatformCustomCursor;
+pub(crate) use crate::cursor::NoCustomCursor as PlatformCustomCursorBuilder;
 pub(crate) use crate::icon::NoIcon as PlatformIcon;
 pub(crate) use crate::platform_impl::Fullscreen;
 

src/platform_impl/ios/monitor.rs

@@ -8,6 +8,7 @@ use std::{
 use icrate::Foundation::{MainThreadBound, MainThreadMarker, NSInteger};
 use objc2::mutability::IsRetainable;
 use objc2::rc::Id;
+use objc2::Message;
 
 use super::uikit::{UIScreen, UIScreenMode};
 use crate::{
@@ -20,16 +21,15 @@ use crate::{
 #[derive(Debug)]
 struct MainThreadBoundDelegateImpls<T>(MainThreadBound<Id<T>>);
 
-impl<T: IsRetainable> Clone for MainThreadBoundDelegateImpls<T> {
+impl<T: IsRetainable + Message> Clone for MainThreadBoundDelegateImpls<T> {
     fn clone(&self) -> Self {
-        Self(
-            self.0
-                .get_on_main(|inner, mtm| MainThreadBound::new(Id::clone(inner), mtm)),
-        )
+        Self(MainThreadMarker::run_on_main(|mtm| {
+            MainThreadBound::new(Id::clone(self.0.get(mtm)), mtm)
+        }))
     }
 }
 
-impl<T: IsRetainable> hash::Hash for MainThreadBoundDelegateImpls<T> {
+impl<T: IsRetainable + Message> hash::Hash for MainThreadBoundDelegateImpls<T> {
     fn hash<H: hash::Hasher>(&self, state: &mut H) {
         // SAFETY: Marker only used to get the pointer
         let mtm = unsafe { MainThreadMarker::new_unchecked() };
@@ -37,7 +37,7 @@ impl<T: IsRetainable> hash::Hash for MainThreadBoundDelegateImpls<T> {
     }
 }
 
-impl<T: IsRetainable> PartialEq for MainThreadBoundDelegateImpls<T> {
+impl<T: IsRetainable + Message> PartialEq for MainThreadBoundDelegateImpls<T> {
     fn eq(&self, other: &Self) -> bool {
         // SAFETY: Marker only used to get the pointer
         let mtm = unsafe { MainThreadMarker::new_unchecked() };
@@ -45,7 +45,7 @@ impl<T: IsRetainable> PartialEq for MainThreadBoundDelegateImpls<T> {
     }
 }
 
-impl<T: IsRetainable> Eq for MainThreadBoundDelegateImpls<T> {}
+impl<T: IsRetainable + Message> Eq for MainThreadBoundDelegateImpls<T> {}
 
 #[derive(Debug, PartialEq, Eq, Hash, Clone)]
 pub struct VideoMode {
@@ -100,11 +100,9 @@ pub struct MonitorHandle {
 
 impl Clone for MonitorHandle {
     fn clone(&self) -> Self {
-        Self {
-            ui_screen: self
-                .ui_screen
-                .get_on_main(|inner, mtm| MainThreadBound::new(inner.clone(), mtm)),
-        }
+        MainThreadMarker::run_on_main(|mtm| Self {
+            ui_screen: MainThreadBound::new(self.ui_screen.get(mtm).clone(), mtm),
+        })
     }
 }
 
@@ -168,16 +166,16 @@ impl MonitorHandle {
     }
 
     pub fn name(&self) -> Option<String> {
-        self.ui_screen.get_on_main(|ui_screen, mtm| {
+        MainThreadMarker::run_on_main(|mtm| {
             let main = UIScreen::main(mtm);
-            if *ui_screen == main {
+            if *self.ui_screen(mtm) == main {
                 Some("Primary".to_string())
-            } else if *ui_screen == main.mirroredScreen() {
+            } else if *self.ui_screen(mtm) == main.mirroredScreen() {
                 Some("Mirrored".to_string())
             } else {
                 UIScreen::screens(mtm)
                     .iter()
-                    .position(|rhs| rhs == &**ui_screen)
+                    .position(|rhs| rhs == &**self.ui_screen(mtm))
                     .map(|idx| idx.to_string())
             }
         })
@@ -186,31 +184,32 @@ impl MonitorHandle {
     pub fn size(&self) -> PhysicalSize<u32> {
         let bounds = self
             .ui_screen
-            .get_on_main(|ui_screen, _| ui_screen.nativeBounds());
+            .get_on_main(|ui_screen| ui_screen.nativeBounds());
         PhysicalSize::new(bounds.size.width as u32, bounds.size.height as u32)
     }
 
     pub fn position(&self) -> PhysicalPosition<i32> {
         let bounds = self
             .ui_screen
-            .get_on_main(|ui_screen, _| ui_screen.nativeBounds());
+            .get_on_main(|ui_screen| ui_screen.nativeBounds());
         (bounds.origin.x as f64, bounds.origin.y as f64).into()
     }
 
     pub fn scale_factor(&self) -> f64 {
         self.ui_screen
-            .get_on_main(|ui_screen, _| ui_screen.nativeScale()) as f64
+            .get_on_main(|ui_screen| ui_screen.nativeScale()) as f64
     }
 
     pub fn refresh_rate_millihertz(&self) -> Option<u32> {
         Some(
             self.ui_screen
-                .get_on_main(|ui_screen, _| refresh_rate_millihertz(ui_screen)),
+                .get_on_main(|ui_screen| refresh_rate_millihertz(ui_screen)),
         )
     }
 
     pub fn video_modes(&self) -> impl Iterator<Item = VideoMode> {
-        self.ui_screen.get_on_main(|ui_screen, mtm| {
+        MainThreadMarker::run_on_main(|mtm| {
+            let ui_screen = self.ui_screen(mtm);
             // Use Ord impl of RootVideoMode
 
             let modes: BTreeSet<_> = ui_screen
@@ -230,8 +229,12 @@ impl MonitorHandle {
     }
 
     pub fn preferred_video_mode(&self) -> VideoMode {
-        self.ui_screen.get_on_main(|ui_screen, mtm| {
-            VideoMode::new(ui_screen.clone(), ui_screen.preferredMode().unwrap(), mtm)
+        MainThreadMarker::run_on_main(|mtm| {
+            VideoMode::new(
+                self.ui_screen(mtm).clone(),
+                self.ui_screen(mtm).preferredMode().unwrap(),
+                mtm,
+            )
         })
     }
 }

src/platform_impl/ios/view.rs

@@ -1,12 +1,12 @@
 #![allow(clippy::unnecessary_cast)]
 use std::cell::Cell;
-use std::ptr::NonNull;
 
 use icrate::Foundation::{CGFloat, CGRect, MainThreadMarker, NSObject, NSObjectProtocol, NSSet};
-use objc2::declare::{Ivar, IvarDrop};
 use objc2::rc::Id;
 use objc2::runtime::AnyClass;
-use objc2::{declare_class, extern_methods, msg_send, msg_send_id, mutability, ClassType};
+use objc2::{
+    declare_class, extern_methods, msg_send, msg_send_id, mutability, ClassType, DeclaredClass,
+};
 
 use super::app_state::{self, EventWrapper};
 use super::uikit::{
@@ -37,6 +37,8 @@ declare_class!(
         const NAME: &'static str = "WinitUIView";
     }
 
+    impl DeclaredClass for WinitView {}
+
     unsafe impl WinitView {
         #[method(drawRect:)]
         fn draw_rect(&self, rect: CGRect) {
@@ -274,11 +276,7 @@ pub struct ViewControllerState {
 }
 
 declare_class!(
-    pub(crate) struct WinitViewController {
-        state: IvarDrop<Box<ViewControllerState>, "_state">,
-    }
-
-    mod view_controller_ivars;
+    pub(crate) struct WinitViewController;
 
     unsafe impl ClassType for WinitViewController {
         #[inherits(UIResponder, NSObject)]
@@ -287,28 +285,8 @@ declare_class!(
         const NAME: &'static str = "WinitUIViewController";
     }
 
-    unsafe impl WinitViewController {
-        #[method(init)]
-        unsafe fn init(this: *mut Self) -> Option<NonNull<Self>> {
-            let this: Option<&mut Self> = msg_send![super(this), init];
-            this.map(|this| {
-                // These are set in WinitViewController::new, it's just to set them
-                // to _something_.
-                Ivar::write(
-                    &mut this.state,
-                    Box::new(ViewControllerState {
-                        prefers_status_bar_hidden: Cell::new(false),
-                        preferred_status_bar_style: Cell::new(UIStatusBarStyle::Default),
-                        prefers_home_indicator_auto_hidden: Cell::new(false),
-                        supported_orientations: Cell::new(UIInterfaceOrientationMask::All),
-                        preferred_screen_edges_deferring_system_gestures: Cell::new(
-                            UIRectEdge::NONE,
-                        ),
-                    }),
-                );
-                NonNull::from(this)
-            })
-        }
+    impl DeclaredClass for WinitViewController {
+        type Ivars = ViewControllerState;
     }
 
     unsafe impl WinitViewController {
@@ -319,27 +297,27 @@ declare_class!(
 
         #[method(prefersStatusBarHidden)]
         fn prefers_status_bar_hidden(&self) -> bool {
-            self.state.prefers_status_bar_hidden.get()
+            self.ivars().prefers_status_bar_hidden.get()
         }
 
         #[method(preferredStatusBarStyle)]
         fn preferred_status_bar_style(&self) -> UIStatusBarStyle {
-            self.state.preferred_status_bar_style.get()
+            self.ivars().preferred_status_bar_style.get()
         }
 
         #[method(prefersHomeIndicatorAutoHidden)]
         fn prefers_home_indicator_auto_hidden(&self) -> bool {
-            self.state.prefers_home_indicator_auto_hidden.get()
+            self.ivars().prefers_home_indicator_auto_hidden.get()
         }
 
         #[method(supportedInterfaceOrientations)]
         fn supported_orientations(&self) -> UIInterfaceOrientationMask {
-            self.state.supported_orientations.get()
+            self.ivars().supported_orientations.get()
         }
 
         #[method(preferredScreenEdgesDeferringSystemGestures)]
         fn preferred_screen_edges_deferring_system_gestures(&self) -> UIRectEdge {
-            self.state
+            self.ivars()
                 .preferred_screen_edges_deferring_system_gestures
                 .get()
         }
@@ -348,17 +326,17 @@ declare_class!(
 
 impl WinitViewController {
     pub(crate) fn set_prefers_status_bar_hidden(&self, val: bool) {
-        self.state.prefers_status_bar_hidden.set(val);
+        self.ivars().prefers_status_bar_hidden.set(val);
         self.setNeedsStatusBarAppearanceUpdate();
     }
 
     pub(crate) fn set_preferred_status_bar_style(&self, val: UIStatusBarStyle) {
-        self.state.preferred_status_bar_style.set(val);
+        self.ivars().preferred_status_bar_style.set(val);
         self.setNeedsStatusBarAppearanceUpdate();
     }
 
     pub(crate) fn set_prefers_home_indicator_auto_hidden(&self, val: bool) {
-        self.state.prefers_home_indicator_auto_hidden.set(val);
+        self.ivars().prefers_home_indicator_auto_hidden.set(val);
         let os_capabilities = app_state::os_capabilities();
         if os_capabilities.home_indicator_hidden {
             self.setNeedsUpdateOfHomeIndicatorAutoHidden();
@@ -368,7 +346,7 @@ impl WinitViewController {
     }
 
     pub(crate) fn set_preferred_screen_edges_deferring_system_gestures(&self, val: UIRectEdge) {
-        self.state
+        self.ivars()
             .preferred_screen_edges_deferring_system_gestures
             .set(val);
         let os_capabilities = app_state::os_capabilities();
@@ -401,7 +379,7 @@ impl WinitViewController {
                     | UIInterfaceOrientationMask::PortraitUpsideDown
             }
         };
-        self.state.supported_orientations.set(mask);
+        self.ivars().supported_orientations.set(mask);
         UIViewController::attemptRotationToDeviceOrientation();
     }
 
@@ -411,7 +389,15 @@ impl WinitViewController {
         platform_attributes: &PlatformSpecificWindowBuilderAttributes,
         view: &UIView,
     ) -> Id<Self> {
-        let this: Id<Self> = unsafe { msg_send_id![Self::alloc(), init] };
+        // These are set properly below, we just to set them to something in the meantime.
+        let this = Self::alloc().set_ivars(ViewControllerState {
+            prefers_status_bar_hidden: Cell::new(false),
+            preferred_status_bar_style: Cell::new(UIStatusBarStyle::Default),
+            prefers_home_indicator_auto_hidden: Cell::new(false),
+            supported_orientations: Cell::new(UIInterfaceOrientationMask::All),
+            preferred_screen_edges_deferring_system_gestures: Cell::new(UIRectEdge::NONE),
+        });
+        let this: Id<Self> = unsafe { msg_send_id![super(this), init] };
 
         this.set_prefers_status_bar_hidden(platform_attributes.prefers_status_bar_hidden);
 
@@ -446,6 +432,8 @@ declare_class!(
         const NAME: &'static str = "WinitUIWindow";
     }
 
+    impl DeclaredClass for WinitUIWindow {}
+
     unsafe impl WinitUIWindow {
         #[method(becomeKeyWindow)]
         fn become_key_window(&self) {
@@ -518,6 +506,8 @@ declare_class!(
         const NAME: &'static str = "WinitApplicationDelegate";
     }
 
+    impl DeclaredClass for WinitApplicationDelegate {}
+
     // UIApplicationDelegate protocol
     unsafe impl WinitApplicationDelegate {
         #[method(application:didFinishLaunchingWithOptions:)]

src/platform_impl/ios/window.rs

@@ -17,7 +17,7 @@ use crate::{
     icon::Icon,
     platform::ios::{ScreenEdge, StatusBarStyle, ValidOrientations},
     platform_impl::platform::{
-        app_state, monitor, EventLoopWindowTarget, Fullscreen, MonitorHandle,
+        app_state, monitor, EventLoopWindowTarget, Fullscreen, MonitorHandle, PlatformCustomCursor,
     },
     window::{
         CursorGrabMode, CursorIcon, ImePurpose, ResizeDirection, Theme, UserAttentionType,
@@ -25,6 +25,19 @@ use crate::{
     },
 };
 
+#[derive(Debug, Clone)]
+pub(crate) struct OwnedWindowHandle {}
+
+impl OwnedWindowHandle {
+    #[cfg(feature = "rwh_06")]
+    pub(crate) fn new_parent_window(_handle: rwh_06::WindowHandle<'_>) -> Self {
+        // Parent windows are currently unsupported, though owned window
+        // handles would be implementable (would work similar to macOS).
+        warn!("parent windows are unsupported on iOS");
+        Self {}
+    }
+}
+
 pub struct Inner {
     window: Id<WinitUIWindow>,
     view_controller: Id<WinitViewController>,
@@ -177,6 +190,10 @@ impl Inner {
         debug!("`Window::set_cursor_icon` ignored on iOS")
     }
 
+    pub(crate) fn set_custom_cursor(&self, _: PlatformCustomCursor) {
+        debug!("`Window::set_custom_cursor` ignored on iOS")
+    }
+
     pub fn set_cursor_position(&self, _position: Position) -> Result<(), ExternalError> {
         Err(ExternalError::NotSupported(NotSupportedError::new()))
     }
@@ -355,14 +372,14 @@ impl Inner {
     }
 
     #[cfg(feature = "rwh_06")]
-    pub fn raw_window_handle_rwh_06(&self) -> Result<rwh_06::RawWindowHandle, rwh_06::HandleError> {
+    pub fn raw_window_handle_rwh_06(&self) -> rwh_06::RawWindowHandle {
         let mut window_handle = rwh_06::UiKitWindowHandle::new({
             let ui_view = Id::as_ptr(&self.view) as _;
             std::ptr::NonNull::new(ui_view).expect("Id<T> should never be null")
         });
         window_handle.ui_view_controller =
             std::ptr::NonNull::new(Id::as_ptr(&self.view_controller) as _);
-        Ok(rwh_06::RawWindowHandle::UiKit(window_handle))
+        rwh_06::RawWindowHandle::UiKit(window_handle)
     }
 
     #[cfg(feature = "rwh_06")]
@@ -516,7 +533,19 @@ impl Window {
     }
 
     pub(crate) fn maybe_wait_on_main<R: Send>(&self, f: impl FnOnce(&Inner) -> R + Send) -> R {
-        self.inner.get_on_main(|inner, _mtm| f(inner))
+        self.inner.get_on_main(|inner| f(inner))
+    }
+
+    #[cfg(feature = "rwh_06")]
+    #[inline]
+    pub(crate) fn raw_window_handle_rwh_06(
+        &self,
+    ) -> Result<rwh_06::RawWindowHandle, rwh_06::HandleError> {
+        if let Some(mtm) = MainThreadMarker::new() {
+            Ok(self.inner.get(mtm).raw_window_handle_rwh_06())
+        } else {
+            Err(rwh_06::HandleError::Unavailable)
+        }
     }
 }
 

src/platform_impl/linux/common/keymap.rs

@@ -504,7 +504,7 @@ pub fn keysym_to_key(keysym: u32) -> Key {
         keysyms::KP_F4 => NamedKey::F4,
         keysyms::KP_Home => NamedKey::Home,
         keysyms::KP_Left => NamedKey::ArrowLeft,
-        keysyms::KP_Up => NamedKey::ArrowUp,
+        keysyms::KP_Up => NamedKey::ArrowLeft,
         keysyms::KP_Right => NamedKey::ArrowRight,
         keysyms::KP_Down => NamedKey::ArrowDown,
         // keysyms::KP_Prior => NamedKey::PageUp,

src/platform_impl/linux/mod.rs

@@ -40,6 +40,8 @@ pub use x11::XNotSupported;
 #[cfg(x11_platform)]
 use x11::{util::WindowType as XWindowType, X11Error, XConnection, XError};
 
+pub(crate) use crate::cursor::OnlyCursorImage as PlatformCustomCursor;
+pub(crate) use crate::cursor::OnlyCursorImageBuilder as PlatformCustomCursorBuilder;
 pub(crate) use crate::icon::RgbaIcon as PlatformIcon;
 pub(crate) use crate::platform_impl::Fullscreen;
 
@@ -139,6 +141,43 @@ impl fmt::Display for OsError {
     }
 }
 
+#[derive(Debug, Clone)]
+#[allow(dead_code)]
+pub(crate) enum OwnedWindowHandle {
+    #[cfg(x11_platform)]
+    X(x11rb::protocol::xproto::Window),
+    #[cfg(wayland_platform)]
+    Wayland,
+}
+
+impl OwnedWindowHandle {
+    #[cfg(feature = "rwh_06")]
+    pub(crate) fn new_parent_window(handle: rwh_06::WindowHandle<'_>) -> Self {
+        // TODO: Do we need to do something extra to extend the lifetime of
+        // the window lives beyond the passed-in handle?
+        match handle.as_raw() {
+            #[cfg(x11_platform)]
+            rwh_06::RawWindowHandle::Xlib(handle) => {
+                Self::X(handle.window as x11rb::protocol::xproto::Window)
+            }
+            #[cfg(x11_platform)]
+            rwh_06::RawWindowHandle::Xcb(handle) => Self::X(handle.window.get()),
+            #[cfg(wayland_platform)]
+            rwh_06::RawWindowHandle::Wayland(_handle) => {
+                // Wayland does not currently support parent windows, but it
+                // could support owned handles.
+                Self::Wayland
+            }
+            #[cfg(not(x11_platform))]
+            handle => panic!("invalid window handle {handle:?} on Wayland"),
+            #[cfg(not(wayland_platform))]
+            handle => panic!("invalid window handle {handle:?} on X11"),
+            #[cfg(all(x11_platform, wayland_platform))]
+            handle => panic!("invalid window handle {handle:?} on X11 or Wayland"),
+        }
+    }
+}
+
 pub(crate) enum Window {
     #[cfg(x11_platform)]
     X(x11::Window),
@@ -424,6 +463,11 @@ impl Window {
         x11_or_wayland!(match self; Window(w) => w.set_cursor_icon(cursor))
     }
 
+    #[inline]
+    pub(crate) fn set_custom_cursor(&self, cursor: PlatformCustomCursor) {
+        x11_or_wayland!(match self; Window(w) => w.set_custom_cursor(cursor))
+    }
+
     #[inline]
     pub fn set_cursor_grab(&self, mode: CursorGrabMode) -> Result<(), ExternalError> {
         x11_or_wayland!(match self; Window(window) => window.set_cursor_grab(mode))
@@ -784,7 +828,7 @@ impl<T: 'static> EventLoop<T> {
             #[cfg(wayland_platform)]
             Backend::Wayland => EventLoop::new_wayland_any_thread().map_err(Into::into),
             #[cfg(x11_platform)]
-            Backend::X => EventLoop::new_x11_any_thread().map_err(Into::into),
+            Backend::X => Ok(EventLoop::new_x11_any_thread().unwrap()),
         }
     }
 
@@ -794,10 +838,10 @@ impl<T: 'static> EventLoop<T> {
     }
 
     #[cfg(x11_platform)]
-    fn new_x11_any_thread() -> Result<EventLoop<T>, EventLoopError> {
+    fn new_x11_any_thread() -> Result<EventLoop<T>, XNotSupported> {
         let xconn = match X11_BACKEND.lock().unwrap().as_ref() {
             Ok(xconn) => xconn.clone(),
-            Err(_) => return Err(EventLoopError::NotSupported(NotSupportedError::new())),
+            Err(err) => return Err(err.clone()),
         };
 
         Ok(EventLoop::X(x11::EventLoop::new(xconn)))
@@ -918,10 +962,6 @@ impl<T> EventLoopWindowTarget<T> {
         x11_or_wayland!(match self; Self(evlp) => evlp.control_flow())
     }
 
-    pub(crate) fn clear_exit(&self) {
-        x11_or_wayland!(match self; Self(evlp) => evlp.clear_exit())
-    }
-
     pub(crate) fn exit(&self) {
         x11_or_wayland!(match self; Self(evlp) => evlp.exit())
     }

src/platform_impl/linux/wayland/event_loop/mod.rs

@@ -16,7 +16,7 @@ use sctk::reexports::calloop_wayland_source::WaylandSource;
 use sctk::reexports::client::globals;
 use sctk::reexports::client::{Connection, QueueHandle};
 
-use crate::dpi::LogicalSize;
+use crate::dpi::{LogicalSize, PhysicalSize};
 use crate::error::{EventLoopError, OsError as RootOsError};
 use crate::event::{Event, InnerSizeWriter, StartCause, WindowEvent};
 use crate::event_loop::{
@@ -34,7 +34,7 @@ use sink::EventSink;
 
 use super::state::{WindowCompositorUpdate, WinitState};
 use super::window::state::FrameCallbackState;
-use super::{logical_to_physical_rounded, DeviceId, WaylandError, WindowId};
+use super::{DeviceId, WaylandError, WindowId};
 
 type WaylandDispatcher = calloop::Dispatcher<'static, WaylandSource<WinitState>, WinitState>;
 
@@ -356,13 +356,15 @@ impl<T: 'static> EventLoop<T> {
 
         for mut compositor_update in compositor_updates.drain(..) {
             let window_id = compositor_update.window_id;
-            if compositor_update.scale_changed {
-                let (physical_size, scale_factor) = self.with_state(|state| {
+            if let Some(scale_factor) = compositor_update.scale_factor {
+                let physical_size = self.with_state(|state| {
                     let windows = state.windows.get_mut();
-                    let window = windows.get(&window_id).unwrap().lock().unwrap();
-                    let scale_factor = window.scale_factor();
-                    let size = logical_to_physical_rounded(window.inner_size(), scale_factor);
-                    (size, scale_factor)
+                    let mut window = windows.get(&window_id).unwrap().lock().unwrap();
+
+                    // Set the new scale factor.
+                    window.set_scale_factor(scale_factor);
+                    let window_size = compositor_update.size.unwrap_or(window.inner_size());
+                    logical_to_physical_rounded(window_size, scale_factor)
                 });
 
                 // Stash the old window size.
@@ -384,32 +386,30 @@ impl<T: 'static> EventLoop<T> {
 
                 let physical_size = *new_inner_size.lock().unwrap();
                 drop(new_inner_size);
+                let new_logical_size = physical_size.to_logical(scale_factor);
 
                 // Resize the window when user altered the size.
                 if old_physical_size != physical_size {
                     self.with_state(|state| {
                         let windows = state.windows.get_mut();
                         let mut window = windows.get(&window_id).unwrap().lock().unwrap();
-
-                        let new_logical_size: LogicalSize<f64> =
-                            physical_size.to_logical(scale_factor);
                         window.request_inner_size(new_logical_size.into());
                     });
-
-                    // Make it queue resize.
-                    compositor_update.resized = true;
                 }
+
+                // Make it queue resize.
+                compositor_update.size = Some(new_logical_size);
             }
 
-            // NOTE: Rescale changed the physical size which winit operates in, thus we should
-            // resize.
-            if compositor_update.resized || compositor_update.scale_changed {
+            if let Some(size) = compositor_update.size.take() {
                 let physical_size = self.with_state(|state| {
                     let windows = state.windows.get_mut();
                     let window = windows.get(&window_id).unwrap().lock().unwrap();
 
                     let scale_factor = window.scale_factor();
-                    let size = logical_to_physical_rounded(window.inner_size(), scale_factor);
+                    let physical_size = logical_to_physical_rounded(size, scale_factor);
+
+                    // TODO could probably bring back size reporting optimization.
 
                     // Mark the window as needed a redraw.
                     state
@@ -420,7 +420,7 @@ impl<T: 'static> EventLoop<T> {
                         .redraw_requested
                         .store(true, Ordering::Relaxed);
 
-                    size
+                    physical_size
                 });
 
                 callback(
@@ -467,44 +467,44 @@ impl<T: 'static> EventLoop<T> {
         });
 
         for window_id in window_ids.drain(..) {
-            let event = self.with_state(|state| {
+            let request_redraw = self.with_state(|state| {
                 let window_requests = state.window_requests.get_mut();
                 if window_requests.get(&window_id).unwrap().take_closed() {
                     mem::drop(window_requests.remove(&window_id));
                     mem::drop(state.windows.get_mut().remove(&window_id));
-                    return Some(WindowEvent::Destroyed);
+                    false
+                } else {
+                    let mut window = state
+                        .windows
+                        .get_mut()
+                        .get_mut(&window_id)
+                        .unwrap()
+                        .lock()
+                        .unwrap();
+
+                    if window.frame_callback_state() == FrameCallbackState::Requested {
+                        false
+                    } else {
+                        // Reset the frame callbacks state.
+                        window.frame_callback_reset();
+                        let mut redraw_requested = window_requests
+                            .get(&window_id)
+                            .unwrap()
+                            .take_redraw_requested();
+
+                        // Redraw the frame while at it.
+                        redraw_requested |= window.refresh_frame();
+
+                        redraw_requested
+                    }
                 }
-
-                let mut window = state
-                    .windows
-                    .get_mut()
-                    .get_mut(&window_id)
-                    .unwrap()
-                    .lock()
-                    .unwrap();
-
-                if window.frame_callback_state() == FrameCallbackState::Requested {
-                    return None;
-                }
-
-                // Reset the frame callbacks state.
-                window.frame_callback_reset();
-                let mut redraw_requested = window_requests
-                    .get(&window_id)
-                    .unwrap()
-                    .take_redraw_requested();
-
-                // Redraw the frame while at it.
-                redraw_requested |= window.refresh_frame();
-
-                redraw_requested.then_some(WindowEvent::RedrawRequested)
             });
 
-            if let Some(event) = event {
+            if request_redraw {
                 callback(
                     Event::WindowEvent {
                         window_id: crate::window::WindowId(window_id),
-                        event,
+                        event: WindowEvent::RedrawRequested,
                     },
                     &self.window_target,
                 );
@@ -629,34 +629,6 @@ pub struct EventLoopWindowTarget<T> {
 }
 
 impl<T> EventLoopWindowTarget<T> {
-    pub(crate) fn set_control_flow(&self, control_flow: ControlFlow) {
-        self.control_flow.set(control_flow)
-    }
-
-    pub(crate) fn control_flow(&self) -> ControlFlow {
-        self.control_flow.get()
-    }
-
-    pub(crate) fn exit(&self) {
-        self.exit.set(Some(0))
-    }
-
-    pub(crate) fn clear_exit(&self) {
-        self.exit.set(None)
-    }
-
-    pub(crate) fn exiting(&self) -> bool {
-        self.exit.get().is_some()
-    }
-
-    pub(crate) fn set_exit_code(&self, code: i32) {
-        self.exit.set(Some(code))
-    }
-
-    pub(crate) fn exit_code(&self) -> Option<i32> {
-        self.exit.get()
-    }
-
     #[inline]
     pub fn listen_device_events(&self, _allowed: DeviceEvents) {}
 
@@ -684,3 +656,10 @@ impl<T> EventLoopWindowTarget<T> {
         .into())
     }
 }
+
+// The default routine does floor, but we need round on Wayland.
+fn logical_to_physical_rounded(size: LogicalSize<u32>, scale_factor: f64) -> PhysicalSize<u32> {
+    let width = size.width as f64 * scale_factor;
+    let height = size.height as f64 * scale_factor;
+    (width.round(), height.round()).into()
+}

src/platform_impl/linux/wayland/mod.rs

@@ -9,7 +9,6 @@ use sctk::reexports::client::globals::{BindError, GlobalError};
 use sctk::reexports::client::protocol::wl_surface::WlSurface;
 use sctk::reexports::client::{self, ConnectError, DispatchError, Proxy};
 
-use crate::dpi::{LogicalSize, PhysicalSize};
 pub use crate::platform_impl::platform::{OsError, WindowId};
 pub use event_loop::{EventLoop, EventLoopProxy, EventLoopWindowTarget};
 pub use output::{MonitorHandle, VideoMode};
@@ -77,10 +76,3 @@ impl DeviceId {
 fn make_wid(surface: &WlSurface) -> WindowId {
     WindowId(surface.id().as_ptr() as u64)
 }
-
-/// The default routine does floor, but we need round on Wayland.
-fn logical_to_physical_rounded(size: LogicalSize<u32>, scale_factor: f64) -> PhysicalSize<u32> {
-    let width = size.width as f64 * scale_factor;
-    let height = size.height as f64 * scale_factor;
-    (width.round(), height.round()).into()
-}

src/platform_impl/linux/wayland/output.rs

@@ -4,6 +4,7 @@ use sctk::reexports::client::Proxy;
 use sctk::output::OutputData;
 
 use crate::dpi::{LogicalPosition, PhysicalPosition, PhysicalSize};
+use crate::event_loop::ControlFlow;
 use crate::platform_impl::platform::VideoMode as PlatformVideoMode;
 
 use super::event_loop::EventLoopWindowTarget;
@@ -23,6 +24,30 @@ impl<T> EventLoopWindowTarget<T> {
         // There's no primary monitor on Wayland.
         None
     }
+
+    pub(crate) fn set_control_flow(&self, control_flow: ControlFlow) {
+        self.control_flow.set(control_flow)
+    }
+
+    pub(crate) fn control_flow(&self) -> ControlFlow {
+        self.control_flow.get()
+    }
+
+    pub(crate) fn exit(&self) {
+        self.exit.set(Some(0))
+    }
+
+    pub(crate) fn exiting(&self) -> bool {
+        self.exit.get().is_some()
+    }
+
+    pub(crate) fn set_exit_code(&self, code: i32) {
+        self.exit.set(Some(code))
+    }
+
+    pub(crate) fn exit_code(&self) -> Option<i32> {
+        self.exit.get()
+    }
 }
 
 #[derive(Clone, Debug)]

src/platform_impl/linux/wayland/state.rs

@@ -19,22 +19,25 @@ use sctk::seat::SeatState;
 use sctk::shell::xdg::window::{Window, WindowConfigure, WindowHandler};
 use sctk::shell::xdg::XdgShell;
 use sctk::shell::WaylandSurface;
+use sctk::shm::slot::SlotPool;
 use sctk::shm::{Shm, ShmHandler};
 use sctk::subcompositor::SubcompositorState;
 
-use crate::platform_impl::wayland::event_loop::sink::EventSink;
-use crate::platform_impl::wayland::output::MonitorHandle;
-use crate::platform_impl::wayland::seat::{
+use crate::dpi::LogicalSize;
+use crate::platform_impl::OsError;
+
+use super::event_loop::sink::EventSink;
+use super::output::MonitorHandle;
+use super::seat::{
     PointerConstraintsState, RelativePointerState, TextInputState, WinitPointerData,
     WinitPointerDataExt, WinitSeatState,
 };
-use crate::platform_impl::wayland::types::kwin_blur::KWinBlurManager;
-use crate::platform_impl::wayland::types::wp_fractional_scaling::FractionalScalingManager;
-use crate::platform_impl::wayland::types::wp_viewporter::ViewporterState;
-use crate::platform_impl::wayland::types::xdg_activation::XdgActivationState;
-use crate::platform_impl::wayland::window::{WindowRequests, WindowState};
-use crate::platform_impl::wayland::{WaylandError, WindowId};
-use crate::platform_impl::OsError;
+use super::types::kwin_blur::KWinBlurManager;
+use super::types::wp_fractional_scaling::FractionalScalingManager;
+use super::types::wp_viewporter::ViewporterState;
+use super::types::xdg_activation::XdgActivationState;
+use super::window::{WindowRequests, WindowState};
+use super::{WaylandError, WindowId};
 
 /// Winit's Wayland state.
 pub struct WinitState {
@@ -56,6 +59,9 @@ pub struct WinitState {
     /// The shm for software buffers, such as cursors.
     pub shm: Shm,
 
+    /// The pool where custom cursors are allocated.
+    pub custom_cursor_pool: Arc<Mutex<SlotPool>>,
+
     /// The XDG shell that is used for widnows.
     pub xdg_shell: XdgShell,
 
@@ -151,13 +157,17 @@ impl WinitState {
                 (None, None)
             };
 
+        let shm = Shm::bind(globals, queue_handle).map_err(WaylandError::Bind)?;
+        let custom_cursor_pool = Arc::new(Mutex::new(SlotPool::new(2, &shm).unwrap()));
+
         Ok(Self {
             registry_state,
             compositor_state: Arc::new(compositor_state),
             subcompositor_state: subcompositor_state.map(Arc::new),
             output_state,
             seat_state,
-            shm: Shm::bind(globals, queue_handle).map_err(WaylandError::Bind)?,
+            shm,
+            custom_cursor_pool,
 
             xdg_shell: XdgShell::bind(globals, queue_handle).map_err(WaylandError::Bind)?,
             xdg_activation: XdgActivationState::bind(globals, queue_handle).ok(),
@@ -217,7 +227,7 @@ impl WinitState {
 
             // Update the scale factor right away.
             window.lock().unwrap().set_scale_factor(scale_factor);
-            self.window_compositor_updates[pos].scale_changed = true;
+            self.window_compositor_updates[pos].scale_factor = Some(scale_factor);
         } else if let Some(pointer) = self.pointer_surfaces.get(&surface.id()) {
             // Get the window, where the pointer resides right now.
             let focused_window = match pointer.pointer().winit_data().focused_window() {
@@ -281,7 +291,9 @@ impl WindowHandler for WinitState {
         };
 
         // Populate the configure to the window.
-        self.window_compositor_updates[pos].resized |= self
+        //
+        // XXX the size on the window will be updated right before dispatching the size to the user.
+        let new_size = self
             .windows
             .get_mut()
             .get_mut(&window_id)
@@ -294,6 +306,12 @@ impl WindowHandler for WinitState {
                 &self.subcompositor_state,
                 &mut self.events_sink,
             );
+
+        // NOTE: Only update when the value is `Some` to not override consequent configures with
+        // the same sizes.
+        if new_size.is_some() {
+            self.window_compositor_updates[pos].size = new_size;
+        }
     }
 }
 
@@ -387,10 +405,10 @@ pub struct WindowCompositorUpdate {
     pub window_id: WindowId,
 
     /// New window size.
-    pub resized: bool,
+    pub size: Option<LogicalSize<u32>>,
 
     /// New scale factor.
-    pub scale_changed: bool,
+    pub scale_factor: Option<f64>,
 
     /// Close the window.
     pub close_window: bool,
@@ -400,8 +418,8 @@ impl WindowCompositorUpdate {
     fn new(window_id: WindowId) -> Self {
         Self {
             window_id,
-            resized: false,
-            scale_changed: false,
+            size: None,
+            scale_factor: None,
             close_window: false,
         }
     }

src/platform_impl/linux/wayland/types/cursor.rs

@@ -0,0 +1,56 @@
+use cursor_icon::CursorIcon;
+
+use sctk::reexports::client::protocol::wl_shm::Format;
+use sctk::shm::slot::{Buffer, SlotPool};
+
+use crate::cursor::CursorImage;
+
+#[derive(Debug)]
+pub enum SelectedCursor {
+    Named(CursorIcon),
+    Custom(CustomCursor),
+}
+
+impl Default for SelectedCursor {
+    fn default() -> Self {
+        Self::Named(Default::default())
+    }
+}
+
+#[derive(Debug)]
+pub struct CustomCursor {
+    pub buffer: Buffer,
+    pub w: i32,
+    pub h: i32,
+    pub hotspot_x: i32,
+    pub hotspot_y: i32,
+}
+
+impl CustomCursor {
+    pub(crate) fn new(pool: &mut SlotPool, image: &CursorImage) -> Self {
+        let (buffer, canvas) = pool
+            .create_buffer(
+                image.width as i32,
+                image.height as i32,
+                4 * (image.width as i32),
+                Format::Argb8888,
+            )
+            .unwrap();
+
+        for (canvas_chunk, rgba_chunk) in canvas.chunks_exact_mut(4).zip(image.rgba.chunks_exact(4))
+        {
+            canvas_chunk[0] = rgba_chunk[2];
+            canvas_chunk[1] = rgba_chunk[1];
+            canvas_chunk[2] = rgba_chunk[0];
+            canvas_chunk[3] = rgba_chunk[3];
+        }
+
+        CustomCursor {
+            buffer,
+            w: image.width as i32,
+            h: image.height as i32,
+            hotspot_x: image.hotspot_x as i32,
+            hotspot_y: image.hotspot_y as i32,
+        }
+    }
+}

src/platform_impl/linux/wayland/types/mod.rs

@@ -1,5 +1,6 @@
 //! Wayland protocol implementation boilerplate.
 
+pub mod cursor;
 pub mod kwin_blur;
 pub mod wp_fractional_scaling;
 pub mod wp_viewporter;

src/platform_impl/linux/wayland/window/mod.rs

@@ -20,8 +20,8 @@ use crate::error::{ExternalError, NotSupportedError, OsError as RootOsError};
 use crate::event::{Ime, WindowEvent};
 use crate::event_loop::AsyncRequestSerial;
 use crate::platform_impl::{
-    Fullscreen, MonitorHandle as PlatformMonitorHandle, OsError, PlatformIcon,
-    PlatformSpecificWindowBuilderAttributes as PlatformAttributes,
+    Fullscreen, MonitorHandle as PlatformMonitorHandle, OsError, PlatformCustomCursor,
+    PlatformIcon, PlatformSpecificWindowBuilderAttributes as PlatformAttributes,
 };
 use crate::window::{
     CursorGrabMode, CursorIcon, ImePurpose, ResizeDirection, Theme, UserAttentionType,
@@ -280,7 +280,7 @@ impl Window {
     pub fn inner_size(&self) -> PhysicalSize<u32> {
         let window_state = self.window_state.lock().unwrap();
         let scale_factor = window_state.scale_factor();
-        super::logical_to_physical_rounded(window_state.inner_size(), scale_factor)
+        window_state.inner_size().to_physical(scale_factor)
     }
 
     #[inline]
@@ -308,7 +308,7 @@ impl Window {
     pub fn outer_size(&self) -> PhysicalSize<u32> {
         let window_state = self.window_state.lock().unwrap();
         let scale_factor = window_state.scale_factor();
-        super::logical_to_physical_rounded(window_state.outer_size(), scale_factor)
+        window_state.outer_size().to_physical(scale_factor)
     }
 
     #[inline]
@@ -506,6 +506,14 @@ impl Window {
         self.window_state.lock().unwrap().set_cursor(cursor);
     }
 
+    #[inline]
+    pub(crate) fn set_custom_cursor(&self, cursor: PlatformCustomCursor) {
+        self.window_state
+            .lock()
+            .unwrap()
+            .set_custom_cursor(&cursor.0);
+    }
+
     #[inline]
     pub fn set_cursor_visible(&self, visible: bool) {
         self.window_state

src/platform_impl/linux/wayland/window/state.rs

@@ -1,7 +1,7 @@
 //! The state of the window, which is shared with the event-loop.
 
 use std::num::NonZeroU32;
-use std::sync::{Arc, Weak};
+use std::sync::{Arc, Mutex, Weak};
 use std::time::Duration;
 
 use log::{info, warn};
@@ -18,21 +18,24 @@ use sctk::reexports::protocols::wp::text_input::zv3::client::zwp_text_input_v3::
 use sctk::reexports::protocols::wp::viewporter::client::wp_viewport::WpViewport;
 use sctk::reexports::protocols::xdg::shell::client::xdg_toplevel::ResizeEdge as XdgResizeEdge;
 
-use sctk::compositor::{CompositorState, Region};
-use sctk::seat::pointer::ThemedPointer;
+use sctk::compositor::{CompositorState, Region, SurfaceData, SurfaceDataExt};
+use sctk::seat::pointer::{PointerDataExt, ThemedPointer};
 use sctk::shell::xdg::window::{DecorationMode, Window, WindowConfigure};
 use sctk::shell::xdg::XdgSurface;
 use sctk::shell::WaylandSurface;
+use sctk::shm::slot::SlotPool;
 use sctk::shm::Shm;
 use sctk::subcompositor::SubcompositorState;
 use wayland_protocols_plasma::blur::client::org_kde_kwin_blur::OrgKdeKwinBlur;
 
+use crate::cursor::CursorImage;
 use crate::dpi::{LogicalPosition, LogicalSize, PhysicalSize, Size};
 use crate::error::{ExternalError, NotSupportedError};
 use crate::event::WindowEvent;
 use crate::platform_impl::wayland::event_loop::sink::EventSink;
+use crate::platform_impl::wayland::make_wid;
+use crate::platform_impl::wayland::types::cursor::{CustomCursor, SelectedCursor};
 use crate::platform_impl::wayland::types::kwin_blur::KWinBlurManager;
-use crate::platform_impl::wayland::{logical_to_physical_rounded, make_wid};
 use crate::platform_impl::WindowId;
 use crate::window::{CursorGrabMode, CursorIcon, ImePurpose, ResizeDirection, Theme};
 
@@ -60,14 +63,16 @@ pub struct WindowState {
     /// The `Shm` to set cursor.
     pub shm: WlShm,
 
+    // A shared pool where to allocate custom cursors.
+    custom_cursor_pool: Arc<Mutex<SlotPool>>,
+
     /// The last received configure.
     pub last_configure: Option<WindowConfigure>,
 
     /// The pointers observed on the window.
     pub pointers: Vec<Weak<ThemedPointer<WinitPointerData>>>,
 
-    /// Cursor icon.
-    pub cursor_icon: CursorIcon,
+    selected_cursor: SelectedCursor,
 
     /// Wether the cursor is visible.
     pub cursor_visible: bool,
@@ -178,7 +183,7 @@ impl WindowState {
             connection,
             csd_fails: false,
             cursor_grab_mode: GrabState::new(),
-            cursor_icon: CursorIcon::Default,
+            selected_cursor: Default::default(),
             cursor_visible: true,
             decorate: true,
             fractional_scale,
@@ -197,6 +202,7 @@ impl WindowState {
             resizable: true,
             scale_factor: 1.,
             shm: winit_state.shm.wl_shm().clone(),
+            custom_cursor_pool: winit_state.custom_cursor_pool.clone(),
             size: initial_size.to_logical(1.),
             stateless_size: initial_size.to_logical(1.),
             initial_size: Some(initial_size),
@@ -256,7 +262,7 @@ impl WindowState {
         shm: &Shm,
         subcompositor: &Option<Arc<SubcompositorState>>,
         event_sink: &mut EventSink,
-    ) -> bool {
+    ) -> Option<LogicalSize<u32>> {
         // NOTE: when using fractional scaling or wl_compositor@v6 the scaling
         // should be delivered before the first configure, thus apply it to
         // properly scale the physical sizes provided by the users.
@@ -368,9 +374,9 @@ impl WindowState {
 
         if state_change_requires_resize || new_size != self.inner_size() {
             self.resize(new_size);
-            true
+            Some(new_size)
         } else {
-            false
+            None
         }
     }
 
@@ -616,7 +622,10 @@ impl WindowState {
     /// Reload the cursor style on the given window.
     pub fn reload_cursor_style(&mut self) {
         if self.cursor_visible {
-            self.set_cursor(self.cursor_icon);
+            match &self.selected_cursor {
+                SelectedCursor::Named(icon) => self.set_cursor(*icon),
+                SelectedCursor::Custom(cursor) => self.apply_custom_cursor(cursor),
+            }
         } else {
             self.set_cursor_visible(self.cursor_visible);
         }
@@ -647,7 +656,7 @@ impl WindowState {
             self.resize(inner_size.to_logical(self.scale_factor()))
         }
 
-        logical_to_physical_rounded(self.inner_size(), self.scale_factor())
+        self.inner_size().to_physical(self.scale_factor())
     }
 
     /// Resize the window to the new inner size.
@@ -702,10 +711,8 @@ impl WindowState {
     }
 
     /// Set the cursor icon.
-    ///
-    /// Providing `None` will hide the cursor.
     pub fn set_cursor(&mut self, cursor_icon: CursorIcon) {
-        self.cursor_icon = cursor_icon;
+        self.selected_cursor = SelectedCursor::Named(cursor_icon);
 
         if !self.cursor_visible {
             return;
@@ -718,6 +725,54 @@ impl WindowState {
         })
     }
 
+    /// Set the custom cursor icon.
+    pub(crate) fn set_custom_cursor(&mut self, cursor: &CursorImage) {
+        let cursor = {
+            let mut pool = self.custom_cursor_pool.lock().unwrap();
+            CustomCursor::new(&mut pool, cursor)
+        };
+
+        if self.cursor_visible {
+            self.apply_custom_cursor(&cursor);
+        }
+
+        self.selected_cursor = SelectedCursor::Custom(cursor);
+    }
+
+    fn apply_custom_cursor(&self, cursor: &CustomCursor) {
+        self.apply_on_poiner(|pointer, _| {
+            let surface = pointer.surface();
+
+            let scale = surface
+                .data::<SurfaceData>()
+                .unwrap()
+                .surface_data()
+                .scale_factor();
+
+            surface.set_buffer_scale(scale);
+            surface.attach(Some(cursor.buffer.wl_buffer()), 0, 0);
+            if surface.version() >= 4 {
+                surface.damage_buffer(0, 0, cursor.w, cursor.h);
+            } else {
+                surface.damage(0, 0, cursor.w / scale, cursor.h / scale);
+            }
+            surface.commit();
+
+            let serial = pointer
+                .pointer()
+                .data::<WinitPointerData>()
+                .and_then(|data| data.pointer_data().latest_enter_serial())
+                .unwrap();
+
+            pointer.pointer().set_cursor(
+                serial,
+                Some(surface),
+                cursor.hotspot_x / scale,
+                cursor.hotspot_y / scale,
+            );
+        });
+    }
+
     /// Set maximum inner window size.
     pub fn set_min_inner_size(&mut self, size: Option<LogicalSize<u32>>) {
         // Ensure that the window has the right minimum size.
@@ -852,7 +907,10 @@ impl WindowState {
         self.cursor_visible = cursor_visible;
 
         if self.cursor_visible {
-            self.set_cursor(self.cursor_icon);
+            match &self.selected_cursor {
+                SelectedCursor::Named(icon) => self.set_cursor(*icon),
+                SelectedCursor::Custom(cursor) => self.apply_custom_cursor(cursor),
+            }
         } else {
             for pointer in self.pointers.iter().filter_map(|pointer| pointer.upgrade()) {
                 let latest_enter_serial = pointer.pointer().winit_data().latest_enter_serial();

src/platform_impl/linux/x11/event_processor.rs

@@ -1,5 +1,5 @@
 use std::{
-    cell::{Cell, RefCell},
+    cell::RefCell,
     collections::HashMap,
     os::raw::{c_char, c_int, c_long, c_ulong},
     rc::Rc,
@@ -56,8 +56,6 @@ pub(super) struct EventProcessor<T: 'static> {
     pub(super) first_touch: Option<u64>,
     // Currently focused window belonging to this process
     pub(super) active_window: Option<xproto::Window>,
-    /// Latest modifiers we've sent for the user to trigger change in event.
-    pub(super) modifiers: Cell<ModifiersState>,
     pub(super) is_composing: bool,
 }
 
@@ -996,7 +994,12 @@ impl<T: 'static> EventProcessor<T> {
 
                             let modifiers: crate::keyboard::ModifiersState =
                                 self.kb_state.mods_state().into();
-                            self.send_modifiers(modifiers, &mut callback);
+                            if !modifiers.is_empty() {
+                                callback(Event::WindowEvent {
+                                    window_id,
+                                    event: WindowEvent::ModifiersChanged(modifiers.into()),
+                                });
+                            }
 
                             // The deviceid for this event is for a keyboard instead of a pointer,
                             // so we have to do a little extra work.
@@ -1058,7 +1061,12 @@ impl<T: 'static> EventProcessor<T> {
                             // window regains focus.
                             self.held_key_press = None;
 
-                            self.send_modifiers(ModifiersState::empty(), &mut callback);
+                            callback(Event::WindowEvent {
+                                window_id,
+                                event: WindowEvent::ModifiersChanged(
+                                    ModifiersState::empty().into(),
+                                ),
+                            });
 
                             if let Some(window) = self.with_window(window, Arc::clone) {
                                 window.shared_state_lock().has_focus = false;
@@ -1272,14 +1280,8 @@ impl<T: 'static> EventProcessor<T> {
                                 && (keycodes_changed || geometry_changed)
                             {
                                 unsafe { self.kb_state.init_with_x11_keymap() };
-                                let modifiers = self.kb_state.mods_state();
-                                self.send_modifiers(modifiers.into(), &mut callback);
                             }
                         }
-                        ffi::XkbMapNotify => {
-                            unsafe { self.kb_state.init_with_x11_keymap() };
-                            self.send_modifiers(self.kb_state.mods_state().into(), &mut callback);
-                        }
                         ffi::XkbStateNotify => {
                             let xev =
                                 unsafe { &*(xev as *const _ as *const ffi::XkbStateNotifyEvent) };
@@ -1287,9 +1289,7 @@ impl<T: 'static> EventProcessor<T> {
                             // Set the timestamp.
                             wt.xconn.set_timestamp(xev.time as xproto::Timestamp);
 
-                            // NOTE: Modifiers could update without a prior event updating them,
-                            // thus diffing the state before and after is not reliable.
-
+                            let prev_mods = self.kb_state.mods_state();
                             self.kb_state.update_modifiers(
                                 xev.base_mods,
                                 xev.latched_mods,
@@ -1298,8 +1298,17 @@ impl<T: 'static> EventProcessor<T> {
                                 xev.latched_group as u32,
                                 xev.locked_group as u32,
                             );
-
-                            self.send_modifiers(self.kb_state.mods_state().into(), &mut callback);
+                            let new_mods = self.kb_state.mods_state();
+                            if prev_mods != new_mods {
+                                if let Some(window) = self.active_window {
+                                    callback(Event::WindowEvent {
+                                        window_id: mkwid(window),
+                                        event: WindowEvent::ModifiersChanged(
+                                            Into::<ModifiersState>::into(new_mods).into(),
+                                        ),
+                                    });
+                                }
+                            }
                         }
                         _ => {}
                     }
@@ -1311,7 +1320,7 @@ impl<T: 'static> EventProcessor<T> {
         }
 
         // Handle IME requests.
-        while let Ok(request) = self.ime_receiver.try_recv() {
+        if let Ok(request) = self.ime_receiver.try_recv() {
             let mut ime = wt.ime.borrow_mut();
             match request {
                 ImeRequest::Position(window_id, x, y) => {
@@ -1323,64 +1332,48 @@ impl<T: 'static> EventProcessor<T> {
             }
         }
 
-        // Drain IME events.
-        while let Ok((window, event)) = self.ime_event_receiver.try_recv() {
-            let window_id = mkwid(window as xproto::Window);
-            match event {
-                ImeEvent::Enabled => {
+        let (window, event) = match self.ime_event_receiver.try_recv() {
+            Ok((window, event)) => (window as xproto::Window, event),
+            Err(_) => return,
+        };
+
+        match event {
+            ImeEvent::Enabled => {
+                callback(Event::WindowEvent {
+                    window_id: mkwid(window),
+                    event: WindowEvent::Ime(Ime::Enabled),
+                });
+            }
+            ImeEvent::Start => {
+                self.is_composing = true;
+                callback(Event::WindowEvent {
+                    window_id: mkwid(window),
+                    event: WindowEvent::Ime(Ime::Preedit("".to_owned(), None)),
+                });
+            }
+            ImeEvent::Update(text, position) => {
+                if self.is_composing {
                     callback(Event::WindowEvent {
-                        window_id,
-                        event: WindowEvent::Ime(Ime::Enabled),
-                    });
-                }
-                ImeEvent::Start => {
-                    self.is_composing = true;
-                    callback(Event::WindowEvent {
-                        window_id,
-                        event: WindowEvent::Ime(Ime::Preedit("".to_owned(), None)),
-                    });
-                }
-                ImeEvent::Update(text, position) => {
-                    if self.is_composing {
-                        callback(Event::WindowEvent {
-                            window_id,
-                            event: WindowEvent::Ime(Ime::Preedit(text, Some((position, position)))),
-                        });
-                    }
-                }
-                ImeEvent::End => {
-                    self.is_composing = false;
-                    // Issue empty preedit on `Done`.
-                    callback(Event::WindowEvent {
-                        window_id,
-                        event: WindowEvent::Ime(Ime::Preedit(String::new(), None)),
-                    });
-                }
-                ImeEvent::Disabled => {
-                    self.is_composing = false;
-                    callback(Event::WindowEvent {
-                        window_id,
-                        event: WindowEvent::Ime(Ime::Disabled),
+                        window_id: mkwid(window),
+                        event: WindowEvent::Ime(Ime::Preedit(text, Some((position, position)))),
                     });
                 }
             }
-        }
-    }
-
-    /// Send modifiers for the active window.
-    ///
-    /// The event won't be send when the `modifiers` match the previosly `sent` modifiers value.
-    fn send_modifiers<F: FnMut(Event<T>)>(&self, modifiers: ModifiersState, callback: &mut F) {
-        let window_id = match self.active_window {
-            Some(window) => mkwid(window),
-            None => return,
-        };
-
-        if self.modifiers.replace(modifiers) != modifiers {
-            callback(Event::WindowEvent {
-                window_id,
-                event: WindowEvent::ModifiersChanged(self.modifiers.get().into()),
-            });
+            ImeEvent::End => {
+                self.is_composing = false;
+                // Issue empty preedit on `Done`.
+                callback(Event::WindowEvent {
+                    window_id: mkwid(window),
+                    event: WindowEvent::Ime(Ime::Preedit(String::new(), None)),
+                });
+            }
+            ImeEvent::Disabled => {
+                self.is_composing = false;
+                callback(Event::WindowEvent {
+                    window_id: mkwid(window),
+                    event: WindowEvent::Ime(Ime::Disabled),
+                });
+            }
         }
     }
 
@@ -1420,9 +1413,6 @@ impl<T: 'static> EventProcessor<T> {
         F: FnMut(Event<T>),
     {
         let wt = get_xtarget(&self.target);
-        wt.xconn
-            .reload_database()
-            .expect("failed to reload Xft database");
 
         // In the future, it would be quite easy to emit monitor hotplug events.
         let prev_list = {

src/platform_impl/linux/x11/ime/callbacks.rs

@@ -79,9 +79,9 @@ pub(crate) unsafe fn set_destroy_callback(
 #[allow(clippy::enum_variant_names)]
 enum ReplaceImError {
     // Boxed to prevent large error type
-    MethodOpenFailed(#[allow(dead_code)] Box<PotentialInputMethods>),
-    ContextCreationFailed(#[allow(dead_code)] ImeContextCreationError),
-    SetDestroyCallbackFailed(#[allow(dead_code)] XError),
+    MethodOpenFailed(Box<PotentialInputMethods>),
+    ContextCreationFailed(ImeContextCreationError),
+    SetDestroyCallbackFailed(XError),
 }
 
 // Attempt to replace current IM (which may or may not be presently valid) with a new one. This

src/platform_impl/linux/x11/ime/input_method.rs

@@ -159,9 +159,9 @@ impl InputMethodResult {
 
 #[derive(Debug, Clone)]
 enum GetXimServersError {
-    XError(#[allow(dead_code)] XError),
-    GetPropertyError(#[allow(dead_code)] util::GetPropertyError),
-    InvalidUtf8(#[allow(dead_code)] IntoStringError),
+    XError(XError),
+    GetPropertyError(util::GetPropertyError),
+    InvalidUtf8(IntoStringError),
 }
 
 impl From<util::GetPropertyError> for GetXimServersError {

src/platform_impl/linux/x11/ime/mod.rs

@@ -48,7 +48,7 @@ pub enum ImeRequest {
 pub(crate) enum ImeCreationError {
     // Boxed to prevent large error type
     OpenFailure(Box<PotentialInputMethods>),
-    SetDestroyCallbackFailed(#[allow(dead_code)] XError),
+    SetDestroyCallbackFailed(XError),
 }
 
 pub(crate) struct Ime {

src/platform_impl/linux/x11/mod.rs

@@ -346,7 +346,6 @@ impl<T: 'static> EventLoop<T> {
             held_key_press: None,
             first_touch: None,
             active_window: None,
-            modifiers: Default::default(),
             is_composing: false,
         };
 
@@ -365,9 +364,7 @@ impl<T: 'static> EventLoop<T> {
             .xconn
             .select_xkb_events(
                 0x100, // Use the "core keyboard device"
-                xkb::EventType::NEW_KEYBOARD_NOTIFY
-                    | xkb::EventType::MAP_NOTIFY
-                    | xkb::EventType::STATE_NOTIFY,
+                xkb::EventType::NEW_KEYBOARD_NOTIFY | xkb::EventType::STATE_NOTIFY,
             )
             .unwrap();
 
@@ -755,10 +752,6 @@ impl<T> EventLoopWindowTarget<T> {
         self.exit.set(Some(0))
     }
 
-    pub(crate) fn clear_exit(&self) {
-        self.exit.set(None)
-    }
-
     pub(crate) fn exiting(&self) -> bool {
         self.exit.get().is_some()
     }

src/platform_impl/linux/x11/monitor.rs

@@ -234,8 +234,7 @@ impl XConnection {
 
     fn query_monitor_list(&self) -> Result<Vec<MonitorHandle>, X11Error> {
         let root = self.default_root();
-        let resources =
-            ScreenResources::from_connection(self.xcb_connection(), root, self.randr_version())?;
+        let resources = ScreenResources::from_connection(self.xcb_connection(), root)?;
 
         // Pipeline all of the get-crtc requests.
         let mut crtc_cookies = Vec::with_capacity(resources.crtcs().len());
@@ -285,16 +284,22 @@ impl XConnection {
 
     pub fn available_monitors(&self) -> Result<Vec<MonitorHandle>, X11Error> {
         let mut monitors_lock = self.monitor_handles.lock().unwrap();
-        match *monitors_lock {
-            Some(ref monitors) => Ok(monitors.clone()),
-            None => {
-                let monitors = self.query_monitor_list()?;
-                if !DISABLE_MONITOR_LIST_CACHING {
-                    *monitors_lock = Some(monitors.clone());
-                }
-                Ok(monitors)
-            }
-        }
+        (*monitors_lock)
+            .as_ref()
+            .cloned()
+            .map(Ok)
+            .or_else(|| {
+                self.query_monitor_list()
+                    .map(|mon_list| {
+                        let monitors = Some(mon_list);
+                        if !DISABLE_MONITOR_LIST_CACHING {
+                            (*monitors_lock) = monitors.clone();
+                        }
+                        monitors
+                    })
+                    .transpose()
+            })
+            .unwrap()
     }
 
     #[inline]
@@ -344,9 +349,10 @@ impl ScreenResources {
     pub(crate) fn from_connection(
         conn: &impl x11rb::connection::Connection,
         root: &x11rb::protocol::xproto::Screen,
-        (major_version, minor_version): (u32, u32),
     ) -> Result<Self, X11Error> {
-        if (major_version == 1 && minor_version >= 3) || major_version > 1 {
+        let version = conn.randr_query_version(0, 0)?.reply()?;
+
+        if (version.major_version == 1 && version.minor_version >= 3) || version.major_version > 1 {
             let reply = conn
                 .randr_get_screen_resources_current(root.root)?
                 .reply()?;

src/platform_impl/linux/x11/util/cursor.rs

@@ -1,9 +1,8 @@
-use std::ffi::CString;
-use std::iter;
+use std::{ffi::CString, iter, slice, sync::Arc};
 
 use x11rb::connection::Connection;
 
-use crate::window::CursorIcon;
+use crate::{cursor::CursorImage, window::CursorIcon};
 
 use super::*;
 
@@ -20,6 +19,11 @@ impl XConnection {
             .expect("Failed to set cursor");
     }
 
+    pub(crate) fn set_custom_cursor(&self, window: xproto::Window, cursor: &CustomCursor) {
+        self.update_cursor(window, cursor.inner.cursor)
+            .expect("Failed to set cursor");
+    }
+
     fn create_empty_cursor(&self) -> ffi::Cursor {
         let data = 0;
         let pixmap = unsafe {
@@ -87,3 +91,74 @@ impl XConnection {
         Ok(())
     }
 }
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum SelectedCursor {
+    Custom(CustomCursor),
+    Named(CursorIcon),
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct CustomCursor {
+    inner: Arc<CustomCursorInner>,
+}
+
+impl CustomCursor {
+    pub(crate) unsafe fn new(xconn: &Arc<XConnection>, image: &CursorImage) -> Self {
+        unsafe {
+            let ximage =
+                (xconn.xcursor.XcursorImageCreate)(image.width as i32, image.height as i32);
+            if ximage.is_null() {
+                panic!("failed to allocate cursor image");
+            }
+            (*ximage).xhot = image.hotspot_x as u32;
+            (*ximage).yhot = image.hotspot_y as u32;
+            (*ximage).delay = 0;
+
+            let dst = slice::from_raw_parts_mut((*ximage).pixels, image.rgba.len() / 4);
+            for (dst, chunk) in dst.iter_mut().zip(image.rgba.chunks_exact(4)) {
+                *dst = (chunk[0] as u32) << 16
+                    | (chunk[1] as u32) << 8
+                    | (chunk[2] as u32)
+                    | (chunk[3] as u32) << 24;
+            }
+
+            let cursor = (xconn.xcursor.XcursorImageLoadCursor)(xconn.display, ximage);
+            (xconn.xcursor.XcursorImageDestroy)(ximage);
+            Self {
+                inner: Arc::new(CustomCursorInner {
+                    xconn: xconn.clone(),
+                    cursor,
+                }),
+            }
+        }
+    }
+}
+
+#[derive(Debug)]
+struct CustomCursorInner {
+    xconn: Arc<XConnection>,
+    cursor: ffi::Cursor,
+}
+
+impl Drop for CustomCursorInner {
+    fn drop(&mut self) {
+        unsafe {
+            (self.xconn.xlib.XFreeCursor)(self.xconn.display, self.cursor);
+        }
+    }
+}
+
+impl PartialEq for CustomCursorInner {
+    fn eq(&self, other: &Self) -> bool {
+        self.cursor == other.cursor
+    }
+}
+
+impl Eq for CustomCursorInner {}
+
+impl Default for SelectedCursor {
+    fn default() -> Self {
+        SelectedCursor::Named(Default::default())
+    }
+}

src/platform_impl/linux/x11/util/mod.rs

@@ -13,7 +13,7 @@ mod randr;
 mod window_property;
 mod wm;
 
-pub use self::{geometry::*, hint::*, input::*, window_property::*, wm::*};
+pub use self::{cursor::*, geometry::*, hint::*, input::*, window_property::*, wm::*};
 
 use std::{
     mem::{self, MaybeUninit},

src/platform_impl/linux/x11/window.rs

@@ -7,9 +7,10 @@ use std::{
     sync::{Arc, Mutex, MutexGuard},
 };
 
+use cursor_icon::CursorIcon;
 use x11rb::{
     connection::Connection,
-    properties::{WmHints, WmSizeHints, WmSizeHintsSpecification},
+    properties::{WmHints, WmHintsState, WmSizeHints, WmSizeHintsSpecification},
     protocol::{
         randr,
         shape::SK,
@@ -29,17 +30,20 @@ use crate::{
             atoms::*, xinput_fp1616_to_float, MonitorHandle as X11MonitorHandle, WakeSender,
             X11Error,
         },
-        Fullscreen, MonitorHandle as PlatformMonitorHandle, OsError, PlatformIcon,
-        PlatformSpecificWindowBuilderAttributes, VideoMode as PlatformVideoMode,
+        OwnedWindowHandle as PlatformOwnedWindowHandle,
+        Fullscreen, MonitorHandle as PlatformMonitorHandle, OsError, PlatformCustomCursor,
+        PlatformIcon, PlatformSpecificWindowBuilderAttributes, VideoMode as PlatformVideoMode,
     },
     window::{
-        CursorGrabMode, CursorIcon, ImePurpose, ResizeDirection, Theme, UserAttentionType,
-        WindowAttributes, WindowButtons, WindowLevel,
+        CursorGrabMode, ImePurpose, ResizeDirection, Theme, UserAttentionType, WindowAttributes,
+        WindowButtons, WindowLevel,
     },
 };
 
 use super::{
-    ffi, util, CookieResultExt, EventLoopWindowTarget, ImeRequest, ImeSender, VoidCookie, WindowId,
+    ffi,
+    util::{self, CustomCursor, SelectedCursor},
+    CookieResultExt, EventLoopWindowTarget, ImeRequest, ImeSender, VoidCookie, WindowId,
     XConnection,
 };
 
@@ -126,7 +130,7 @@ pub(crate) struct UnownedWindow {
     root: xproto::Window,               // never changes
     #[allow(dead_code)]
     screen_id: i32, // never changes
-    cursor: Mutex<CursorIcon>,
+    selected_cursor: Mutex<SelectedCursor>,
     cursor_grabbed_mode: Mutex<CursorGrabMode>,
     #[allow(clippy::mutex_atomic)]
     cursor_visible: Mutex<bool>,
@@ -154,15 +158,12 @@ impl UnownedWindow {
     ) -> Result<UnownedWindow, RootOsError> {
         let xconn = &event_loop.xconn;
         let atoms = xconn.atoms();
-        #[cfg(feature = "rwh_06")]
-        let root = match window_attrs.parent_window.0 {
-            Some(rwh_06::RawWindowHandle::Xlib(handle)) => handle.window as xproto::Window,
-            Some(rwh_06::RawWindowHandle::Xcb(handle)) => handle.window.get(),
-            Some(raw) => unreachable!("Invalid raw window handle {raw:?} on X11"),
+        let root = match window_attrs.parent_window {
+            Some(PlatformOwnedWindowHandle::X(handle)) => handle,
+            #[cfg(wayland_platform)]
+            Some(handle) => panic!("invalid window handle {handle:?} on X11"),
             None => event_loop.root,
         };
-        #[cfg(not(feature = "rwh_06"))]
-        let root = event_loop.root;
 
         let mut monitors = leap!(xconn.available_monitors());
         let guessed_monitor = if monitors.is_empty() {
@@ -355,7 +356,7 @@ impl UnownedWindow {
             visual,
             root,
             screen_id,
-            cursor: Default::default(),
+            selected_cursor: Default::default(),
             cursor_grabbed_mode: Mutex::new(CursorGrabMode::None),
             cursor_visible: Mutex::new(true),
             ime_sender: Mutex::new(event_loop.ime_sender.clone()),
@@ -987,7 +988,7 @@ impl UnownedWindow {
                     xproto::EventMask::SUBSTRUCTURE_REDIRECT
                         | xproto::EventMask::SUBSTRUCTURE_NOTIFY,
                 ),
-                [3u32, 0, 0, 0, 0],
+                [WmHintsState::Iconic as u32, 0, 0, 0, 0],
             )
         } else {
             self.xconn.send_client_msg(
@@ -1535,13 +1536,29 @@ impl UnownedWindow {
 
     #[inline]
     pub fn set_cursor_icon(&self, cursor: CursorIcon) {
-        let old_cursor = replace(&mut *self.cursor.lock().unwrap(), cursor);
+        let old_cursor = replace(
+            &mut *self.selected_cursor.lock().unwrap(),
+            SelectedCursor::Named(cursor),
+        );
+
         #[allow(clippy::mutex_atomic)]
-        if cursor != old_cursor && *self.cursor_visible.lock().unwrap() {
+        if SelectedCursor::Named(cursor) != old_cursor && *self.cursor_visible.lock().unwrap() {
             self.xconn.set_cursor_icon(self.xwindow, Some(cursor));
         }
     }
 
+    #[inline]
+    pub(crate) fn set_custom_cursor(&self, cursor: PlatformCustomCursor) {
+        let new_cursor = unsafe { CustomCursor::new(&self.xconn, &cursor.0) };
+
+        #[allow(clippy::mutex_atomic)]
+        if *self.cursor_visible.lock().unwrap() {
+            self.xconn.set_custom_cursor(self.xwindow, &new_cursor);
+        }
+
+        *self.selected_cursor.lock().unwrap() = SelectedCursor::Custom(new_cursor);
+    }
+
     #[inline]
     pub fn set_cursor_grab(&self, mode: CursorGrabMode) -> Result<(), ExternalError> {
         let mut grabbed_lock = self.cursor_grabbed_mode.lock().unwrap();
@@ -1628,13 +1645,23 @@ impl UnownedWindow {
             return;
         }
         let cursor = if visible {
-            Some(*self.cursor.lock().unwrap())
+            Some((*self.selected_cursor.lock().unwrap()).clone())
         } else {
             None
         };
         *visible_lock = visible;
         drop(visible_lock);
-        self.xconn.set_cursor_icon(self.xwindow, cursor);
+        match cursor {
+            Some(SelectedCursor::Custom(cursor)) => {
+                self.xconn.set_custom_cursor(self.xwindow, &cursor);
+            }
+            Some(SelectedCursor::Named(cursor)) => {
+                self.xconn.set_cursor_icon(self.xwindow, Some(cursor));
+            }
+            None => {
+                self.xconn.set_cursor_icon(self.xwindow, None);
+            }
+        }
     }
 
     #[inline]

src/platform_impl/linux/x11/xdisplay.rs

@@ -4,19 +4,14 @@ use std::{
     fmt, ptr,
     sync::{
         atomic::{AtomicU32, Ordering},
-        Arc, Mutex, RwLock, RwLockReadGuard,
+        Arc, Mutex,
     },
 };
 
 use crate::window::CursorIcon;
 
 use super::{atoms::Atoms, ffi, monitor::MonitorHandle};
-use x11rb::{
-    connection::Connection,
-    protocol::{randr::ConnectionExt as _, xproto},
-    resource_manager,
-    xcb_ffi::XCBConnection,
-};
+use x11rb::{connection::Connection, protocol::xproto, resource_manager, xcb_ffi::XCBConnection};
 
 /// A connection to an X server.
 pub(crate) struct XConnection {
@@ -50,10 +45,7 @@ pub(crate) struct XConnection {
     pub monitor_handles: Mutex<Option<Vec<MonitorHandle>>>,
 
     /// The resource database.
-    database: RwLock<resource_manager::Database>,
-
-    /// RandR version.
-    randr_version: (u32, u32),
+    database: resource_manager::Database,
 
     pub latest_error: Mutex<Option<XError>>,
     pub cursor_cache: Mutex<HashMap<Option<CursorIcon>, ffi::Cursor>>,
@@ -112,13 +104,6 @@ impl XConnection {
         let database = resource_manager::new_from_default(&xcb)
             .map_err(|e| XNotSupported::XcbConversionError(Arc::new(e)))?;
 
-        // Load the RandR version.
-        let randr_version = xcb
-            .randr_query_version(1, 3)
-            .expect("failed to request XRandR version")
-            .reply()
-            .expect("failed to query XRandR version");
-
         Ok(XConnection {
             xlib,
             xcursor,
@@ -130,9 +115,8 @@ impl XConnection {
             timestamp: AtomicU32::new(0),
             latest_error: Mutex::new(None),
             monitor_handles: Mutex::new(None),
-            database: RwLock::new(database),
+            database,
             cursor_cache: Default::default(),
-            randr_version: (randr_version.major_version, randr_version.minor_version),
         })
     }
 
@@ -147,11 +131,6 @@ impl XConnection {
         }
     }
 
-    #[inline]
-    pub fn randr_version(&self) -> (u32, u32) {
-        self.randr_version
-    }
-
     /// Get the underlying XCB connection.
     #[inline]
     pub fn xcb_connection(&self) -> &XCBConnection {
@@ -180,16 +159,8 @@ impl XConnection {
 
     /// Get the resource database.
     #[inline]
-    pub fn database(&self) -> RwLockReadGuard<'_, resource_manager::Database> {
-        self.database.read().unwrap_or_else(|e| e.into_inner())
-    }
-
-    /// Reload the resource database.
-    #[inline]
-    pub fn reload_database(&self) -> Result<(), super::X11Error> {
-        let database = resource_manager::new_from_default(self.xcb_connection())?;
-        *self.database.write().unwrap_or_else(|e| e.into_inner()) = database;
-        Ok(())
+    pub fn database(&self) -> &resource_manager::Database {
+        &self.database
     }
 
     /// Get the latest timestamp.

src/platform_impl/macos/app.rs

@@ -1,23 +1,30 @@
 #![allow(clippy::unnecessary_cast)]
 
+use icrate::AppKit::{
+    NSApplication, NSEvent, NSEventModifierFlagCommand, NSEventTypeKeyUp, NSEventTypeLeftMouseDown,
+    NSEventTypeLeftMouseDragged, NSEventTypeLeftMouseUp, NSEventTypeMouseMoved,
+    NSEventTypeOtherMouseDown, NSEventTypeOtherMouseDragged, NSEventTypeOtherMouseUp,
+    NSEventTypeRightMouseDown, NSEventTypeRightMouseDragged, NSEventTypeRightMouseUp, NSResponder,
+};
 use icrate::Foundation::NSObject;
-use objc2::{declare_class, msg_send, mutability, ClassType};
+use objc2::{declare_class, msg_send, mutability, ClassType, DeclaredClass};
 
-use super::appkit::{NSApplication, NSEvent, NSEventModifierFlags, NSEventType, NSResponder};
+use super::event::flags_contains;
 use super::{app_state::AppState, DEVICE_ID};
 use crate::event::{DeviceEvent, ElementState, Event};
 
 declare_class!(
-    #[derive(Debug, PartialEq, Eq, Hash)]
     pub(super) struct WinitApplication;
 
     unsafe impl ClassType for WinitApplication {
         #[inherits(NSResponder, NSObject)]
         type Super = NSApplication;
-        type Mutability = mutability::InteriorMutable;
+        type Mutability = mutability::MainThreadOnly;
         const NAME: &'static str = "WinitApplication";
     }
 
+    impl DeclaredClass for WinitApplication {}
+
     unsafe impl WinitApplication {
         // Normally, holding Cmd + any key never sends us a `keyUp` event for that key.
         // Overriding `sendEvent:` like this fixes that. (https://stackoverflow.com/a/15294196)
@@ -27,13 +34,13 @@ declare_class!(
             // For posterity, there are some undocumented event types
             // (https://github.com/servo/cocoa-rs/issues/155)
             // but that doesn't really matter here.
-            let event_type = event.type_();
-            let modifier_flags = event.modifierFlags();
-            if event_type == NSEventType::NSKeyUp
-                && modifier_flags.contains(NSEventModifierFlags::NSCommandKeyMask)
+            let event_type = unsafe { event.r#type() };
+            let modifier_flags = unsafe { event.modifierFlags() };
+            if event_type == NSEventTypeKeyUp
+                && flags_contains(modifier_flags, NSEventModifierFlagCommand)
             {
                 if let Some(key_window) = self.keyWindow() {
-                    unsafe { key_window.sendEvent(event) };
+                    key_window.sendEvent(event);
                 }
             } else {
                 maybe_dispatch_device_event(event);
@@ -44,14 +51,15 @@ declare_class!(
 );
 
 fn maybe_dispatch_device_event(event: &NSEvent) {
-    let event_type = event.type_();
+    let event_type = unsafe { event.r#type() };
+    #[allow(non_upper_case_globals)]
     match event_type {
-        NSEventType::NSMouseMoved
-        | NSEventType::NSLeftMouseDragged
-        | NSEventType::NSOtherMouseDragged
-        | NSEventType::NSRightMouseDragged => {
-            let delta_x = event.deltaX() as f64;
-            let delta_y = event.deltaY() as f64;
+        NSEventTypeMouseMoved
+        | NSEventTypeLeftMouseDragged
+        | NSEventTypeOtherMouseDragged
+        | NSEventTypeRightMouseDragged => {
+            let delta_x = unsafe { event.deltaX() } as f64;
+            let delta_y = unsafe { event.deltaY() } as f64;
 
             if delta_x != 0.0 {
                 queue_device_event(DeviceEvent::Motion {
@@ -73,17 +81,15 @@ fn maybe_dispatch_device_event(event: &NSEvent) {
                 });
             }
         }
-        NSEventType::NSLeftMouseDown
-        | NSEventType::NSRightMouseDown
-        | NSEventType::NSOtherMouseDown => {
+        NSEventTypeLeftMouseDown | NSEventTypeRightMouseDown | NSEventTypeOtherMouseDown => {
             queue_device_event(DeviceEvent::Button {
-                button: event.buttonNumber() as u32,
+                button: unsafe { event.buttonNumber() } as u32,
                 state: ElementState::Pressed,
             });
         }
-        NSEventType::NSLeftMouseUp | NSEventType::NSRightMouseUp | NSEventType::NSOtherMouseUp => {
+        NSEventTypeLeftMouseUp | NSEventTypeRightMouseUp | NSEventTypeOtherMouseUp => {
             queue_device_event(DeviceEvent::Button {
-                button: event.buttonNumber() as u32,
+                button: unsafe { event.buttonNumber() } as u32,
                 state: ElementState::Released,
             });
         }

src/platform_impl/macos/app_delegate.rs

@@ -1,54 +1,41 @@
-use std::ptr::NonNull;
-
-use icrate::Foundation::NSObject;
-use objc2::declare::{IvarBool, IvarEncode};
+use icrate::AppKit::{NSApplicationActivationPolicy, NSApplicationDelegate};
+use icrate::Foundation::{MainThreadMarker, NSObject, NSObjectProtocol};
 use objc2::rc::Id;
 use objc2::runtime::AnyObject;
-use objc2::{declare_class, msg_send, msg_send_id, mutability, ClassType};
+use objc2::{declare_class, msg_send_id, mutability, ClassType, DeclaredClass};
 
 use super::app_state::AppState;
-use super::appkit::NSApplicationActivationPolicy;
+
+#[derive(Debug)]
+pub(super) struct State {
+    activation_policy: NSApplicationActivationPolicy,
+    default_menu: bool,
+    activate_ignoring_other_apps: bool,
+}
 
 declare_class!(
-    #[derive(Debug)]
-    pub(super) struct ApplicationDelegate {
-        activation_policy: IvarEncode<NSApplicationActivationPolicy, "_activation_policy">,
-        default_menu: IvarBool<"_default_menu">,
-        activate_ignoring_other_apps: IvarBool<"_activate_ignoring_other_apps">,
-    }
-
-    mod ivars;
+    pub(super) struct ApplicationDelegate;
 
     unsafe impl ClassType for ApplicationDelegate {
         type Super = NSObject;
-        type Mutability = mutability::InteriorMutable;
+        type Mutability = mutability::MainThreadOnly;
         const NAME: &'static str = "WinitApplicationDelegate";
     }
 
-    unsafe impl ApplicationDelegate {
-        #[method(initWithActivationPolicy:defaultMenu:activateIgnoringOtherApps:)]
-        unsafe fn init(
-            this: *mut Self,
-            activation_policy: NSApplicationActivationPolicy,
-            default_menu: bool,
-            activate_ignoring_other_apps: bool,
-        ) -> Option<NonNull<Self>> {
-            let this: Option<&mut Self> = unsafe { msg_send![super(this), init] };
-            this.map(|this| {
-                *this.activation_policy = activation_policy;
-                *this.default_menu = default_menu;
-                *this.activate_ignoring_other_apps = activate_ignoring_other_apps;
-                NonNull::from(this)
-            })
-        }
+    impl DeclaredClass for ApplicationDelegate {
+        type Ivars = State;
+    }
 
+    unsafe impl NSObjectProtocol for ApplicationDelegate {}
+
+    unsafe impl NSApplicationDelegate for ApplicationDelegate {
         #[method(applicationDidFinishLaunching:)]
         fn did_finish_launching(&self, _sender: Option<&AnyObject>) {
             trace_scope!("applicationDidFinishLaunching:");
             AppState::launched(
-                *self.activation_policy,
-                *self.default_menu,
-                *self.activate_ignoring_other_apps,
+                self.ivars().activation_policy,
+                self.ivars().default_menu,
+                self.ivars().activate_ignoring_other_apps,
             );
         }
 
@@ -63,17 +50,16 @@ declare_class!(
 
 impl ApplicationDelegate {
     pub(super) fn new(
+        mtm: MainThreadMarker,
         activation_policy: NSApplicationActivationPolicy,
         default_menu: bool,
         activate_ignoring_other_apps: bool,
     ) -> Id<Self> {
-        unsafe {
-            msg_send_id![
-                Self::alloc(),
-                initWithActivationPolicy: activation_policy,
-                defaultMenu: default_menu,
-                activateIgnoringOtherApps: activate_ignoring_other_apps,
-            ]
-        }
+        let this = mtm.alloc().set_ivars(State {
+            activation_policy,
+            default_menu,
+            activate_ignoring_other_apps,
+        });
+        unsafe { msg_send_id![super(this), init] }
     }
 }

src/platform_impl/macos/app_state.rs

@@ -12,13 +12,14 @@ use std::{
 };
 
 use core_foundation::runloop::{CFRunLoopGetMain, CFRunLoopWakeUp};
-use icrate::Foundation::{is_main_thread, NSSize};
+use icrate::AppKit::{NSApplication, NSApplicationActivationPolicy};
+use icrate::Foundation::{is_main_thread, MainThreadMarker, NSSize};
 use objc2::rc::{autoreleasepool, Id};
 use once_cell::sync::Lazy;
 
-use super::appkit::{NSApp, NSApplication, NSApplicationActivationPolicy, NSEvent};
 use super::{
-    event_loop::PanicInfo, menu, observer::EventLoopWaker, util::Never, window::WinitWindow,
+    event::dummy_event, event_loop::PanicInfo, menu, observer::EventLoopWaker, util::Never,
+    window::WinitWindow,
 };
 use crate::{
     dpi::PhysicalSize,
@@ -57,14 +58,14 @@ impl<T> EventLoopHandler<T> {
     where
         F: FnOnce(&mut EventLoopHandler<T>, RefMut<'_, dyn FnMut(Event<T>, &RootWindowTarget<T>)>),
     {
-        // The `NSApp` and our `HANDLER` are global state and so it's possible that
-        // we could get a delegate callback after the application has exit an
+        // `NSApplication` and our `HANDLER` are global state and so it's possible
+        // that we could get a delegate callback after the application has exit an
         // `EventLoop`. If the loop has been exit then our weak `self.callback`
         // will fail to upgrade.
         //
         // We don't want to panic or output any verbose logging if we fail to
         // upgrade the weak reference since it might be valid that the application
-        // re-starts the `NSApp` after exiting a Winit `EventLoop`
+        // re-starts the `NSApplication` after exiting a Winit `EventLoop`
         if let Some(callback) = self.callback.upgrade() {
             let callback = callback.borrow_mut();
             (f)(self, callback);
@@ -144,9 +145,9 @@ impl Handler {
 
     /// `true` after `ApplicationDelegate::applicationDidFinishLaunching` called
     ///
-    /// NB: This is global / `NSApp` state and since the app will only be launched
-    /// once but an `EventLoop` may be run more than once then only the first
-    /// `EventLoop` will observe the `NSApp` before it is launched.
+    /// NB: This is global / `NSApplication` state and since the app will only
+    /// be launched once but an `EventLoop` may be run more than once then only
+    /// the first `EventLoop` will observe the application before it is launched.
     fn is_launched(&self) -> bool {
         self.launched.load(Ordering::Acquire)
     }
@@ -158,8 +159,8 @@ impl Handler {
 
     /// `true` if an `EventLoop` is currently running
     ///
-    /// NB: This is global / `NSApp` state and may persist beyond the lifetime of
-    /// a running `EventLoop`.
+    /// NB: This is global / `NSApplication` state and may persist beyond the
+    /// lifetime of a running `EventLoop`.
     ///
     /// # Caveat
     /// This is only intended to be called from the main thread
@@ -167,7 +168,7 @@ impl Handler {
         self.running.load(Ordering::Relaxed)
     }
 
-    /// Set when an `EventLoop` starts running, after the `NSApp` is launched
+    /// Set when an `EventLoop` starts running, after the `NSApplication` is launched
     ///
     /// # Caveat
     /// This is only intended to be called from the main thread
@@ -180,8 +181,8 @@ impl Handler {
     /// Since an `EventLoop` may be run more than once we need make sure to reset the
     /// `control_flow` state back to `Poll` each time the loop exits.
     ///
-    /// Note: that if the `NSApp` has been launched then that state is preserved, and we won't
-    /// need to re-launch the app if subsequent EventLoops are run.
+    /// Note: that if the `NSApplication` has been launched then that state is preserved,
+    /// and we won't need to re-launch the app if subsequent EventLoops are run.
     ///
     /// # Caveat
     /// This is only intended to be called from the main thread
@@ -209,10 +210,6 @@ impl Handler {
         self.exit.store(true, Ordering::Relaxed)
     }
 
-    pub fn clear_exit(&self) {
-        self.exit.store(false, Ordering::Relaxed)
-    }
-
     pub fn exiting(&self) -> bool {
         self.exit.load(Ordering::Relaxed)
     }
@@ -396,7 +393,7 @@ impl AppState {
     }
 
     // If `pump_events` is called to progress the event loop then we bootstrap the event
-    // loop via `[NSApp run]` but will use `CFRunLoopRunInMode` for subsequent calls to
+    // loop via `-[NSAppplication run]` but will use `CFRunLoopRunInMode` for subsequent calls to
     // `pump_events`
     pub fn request_stop_on_launch() {
         HANDLER.request_stop_app_on_launch();
@@ -438,10 +435,6 @@ impl AppState {
         HANDLER.exit()
     }
 
-    pub fn clear_exit() {
-        HANDLER.clear_exit()
-    }
-
     pub fn exiting() -> bool {
         HANDLER.exiting()
     }
@@ -467,13 +460,15 @@ impl AppState {
         create_default_menu: bool,
         activate_ignoring_other_apps: bool,
     ) {
-        let app = NSApp();
+        let mtm = MainThreadMarker::new().unwrap();
+        let app = NSApplication::sharedApplication(mtm);
         // We need to delay setting the activation policy and activating the app
         // until `applicationDidFinishLaunching` has been called. Otherwise the
         // menu bar is initially unresponsive on macOS 10.15.
         app.setActivationPolicy(activation_policy);
 
         window_activation_hack(&app);
+        #[allow(deprecated)]
         app.activateIgnoringOtherApps(activate_ignoring_other_apps);
 
         HANDLER.set_launched();
@@ -481,21 +476,22 @@ impl AppState {
         if create_default_menu {
             // The menubar initialization should be before the `NewEvents` event, to allow
             // overriding of the default menu even if it's created
-            menu::initialize();
+            menu::initialize(&app);
         }
 
         Self::start_running();
 
-        // If the `NSApp` is being launched via `EventLoop::pump_events()` then we'll
+        // If the application is being launched via `EventLoop::pump_events()` then we'll
         // want to stop the app once it is launched (and return to the external loop)
         //
         // In this case we still want to consider Winit's `EventLoop` to be "running",
         // so we call `start_running()` above.
         if HANDLER.should_stop_app_on_launch() {
             // Note: the original idea had been to only stop the underlying `RunLoop`
-            // for the app but that didn't work as expected (`[NSApp run]` effectively
-            // ignored the attempt to stop the RunLoop and re-started it.). So we
-            // return from `pump_events` by stopping the `NSApp`
+            // for the app but that didn't work as expected (`-[NSApplication run]`
+            // effectively ignored the attempt to stop the RunLoop and re-started it).
+            //
+            // So we return from `pump_events` by stopping the application.
             Self::stop();
         }
     }
@@ -597,11 +593,12 @@ impl AppState {
     }
 
     pub fn stop() {
-        let app = NSApp();
+        let mtm = MainThreadMarker::new().unwrap();
+        let app = NSApplication::sharedApplication(mtm);
         autoreleasepool(|_| {
             app.stop(None);
             // To stop event loop immediately, we need to post some event here.
-            app.postEvent_atStart(&NSEvent::dummy(), true);
+            app.postEvent_atStart(&dummy_event().unwrap(), true);
         });
     }
 

src/platform_impl/macos/appkit/appearance.rs

@@ -1,28 +0,0 @@
-use icrate::Foundation::{NSArray, NSObject, NSString};
-use objc2::rc::Id;
-use objc2::{extern_class, extern_methods, mutability, ClassType};
-
-extern_class!(
-    #[derive(Debug, PartialEq, Eq, Hash)]
-    pub(crate) struct NSAppearance;
-
-    unsafe impl ClassType for NSAppearance {
-        type Super = NSObject;
-        type Mutability = mutability::InteriorMutable;
-    }
-);
-
-type NSAppearanceName = NSString;
-
-extern_methods!(
-    unsafe impl NSAppearance {
-        #[method_id(appearanceNamed:)]
-        pub fn appearanceNamed(name: &NSAppearanceName) -> Id<Self>;
-
-        #[method_id(bestMatchFromAppearancesWithNames:)]
-        pub fn bestMatchFromAppearancesWithNames(
-            &self,
-            appearances: &NSArray<NSAppearanceName>,
-        ) -> Id<NSAppearanceName>;
-    }
-);

src/platform_impl/macos/appkit/application.rs

@@ -1,140 +0,0 @@
-use icrate::Foundation::{MainThreadMarker, NSArray, NSInteger, NSObject, NSUInteger};
-use objc2::rc::Id;
-use objc2::runtime::AnyObject;
-use objc2::{extern_class, extern_methods, msg_send_id, mutability, ClassType};
-use objc2::{Encode, Encoding};
-
-use super::{NSAppearance, NSEvent, NSMenu, NSResponder, NSWindow};
-
-extern_class!(
-    #[derive(Debug, PartialEq, Eq, Hash)]
-    pub(crate) struct NSApplication;
-
-    unsafe impl ClassType for NSApplication {
-        #[inherits(NSObject)]
-        type Super = NSResponder;
-        type Mutability = mutability::InteriorMutable;
-    }
-);
-
-pub(crate) fn NSApp() -> Id<NSApplication> {
-    // TODO: Only allow access from main thread
-    NSApplication::shared(unsafe { MainThreadMarker::new_unchecked() })
-}
-
-extern_methods!(
-    unsafe impl NSApplication {
-        /// This can only be called on the main thread since it may initialize
-        /// the application and since it's parameters may be changed by the main
-        /// thread at any time (hence it is only safe to access on the main thread).
-        pub fn shared(_mtm: MainThreadMarker) -> Id<Self> {
-            let app: Option<_> = unsafe { msg_send_id![Self::class(), sharedApplication] };
-            // SAFETY: `sharedApplication` always initializes the app if it isn't already
-            unsafe { app.unwrap_unchecked() }
-        }
-
-        #[method_id(currentEvent)]
-        pub fn currentEvent(&self) -> Option<Id<NSEvent>>;
-
-        #[method(postEvent:atStart:)]
-        pub fn postEvent_atStart(&self, event: &NSEvent, front_of_queue: bool);
-
-        #[method(presentationOptions)]
-        pub fn presentationOptions(&self) -> NSApplicationPresentationOptions;
-
-        #[method_id(windows)]
-        pub fn windows(&self) -> Id<NSArray<NSWindow>>;
-
-        #[method_id(keyWindow)]
-        pub fn keyWindow(&self) -> Option<Id<NSWindow>>;
-
-        // TODO: NSApplicationDelegate
-        #[method(setDelegate:)]
-        pub fn setDelegate(&self, delegate: &AnyObject);
-
-        #[method(setPresentationOptions:)]
-        pub fn setPresentationOptions(&self, options: NSApplicationPresentationOptions);
-
-        #[method(hide:)]
-        pub fn hide(&self, sender: Option<&AnyObject>);
-
-        #[method(orderFrontCharacterPalette:)]
-        #[allow(dead_code)]
-        pub fn orderFrontCharacterPalette(&self, sender: Option<&AnyObject>);
-
-        #[method(hideOtherApplications:)]
-        pub fn hideOtherApplications(&self, sender: Option<&AnyObject>);
-
-        #[method(stop:)]
-        pub fn stop(&self, sender: Option<&AnyObject>);
-
-        #[method(activateIgnoringOtherApps:)]
-        pub fn activateIgnoringOtherApps(&self, ignore: bool);
-
-        #[method(requestUserAttention:)]
-        pub fn requestUserAttention(&self, type_: NSRequestUserAttentionType) -> NSInteger;
-
-        #[method(setActivationPolicy:)]
-        pub fn setActivationPolicy(&self, policy: NSApplicationActivationPolicy) -> bool;
-
-        #[method(setMainMenu:)]
-        pub fn setMainMenu(&self, menu: &NSMenu);
-
-        #[method_id(effectiveAppearance)]
-        pub fn effectiveAppearance(&self) -> Id<NSAppearance>;
-
-        #[method(setAppearance:)]
-        pub fn setAppearance(&self, appearance: Option<&NSAppearance>);
-
-        #[method(run)]
-        pub unsafe fn run(&self);
-    }
-);
-
-#[allow(dead_code)]
-#[repr(isize)] // NSInteger
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-pub enum NSApplicationActivationPolicy {
-    NSApplicationActivationPolicyRegular = 0,
-    NSApplicationActivationPolicyAccessory = 1,
-    NSApplicationActivationPolicyProhibited = 2,
-    NSApplicationActivationPolicyERROR = -1,
-}
-
-unsafe impl Encode for NSApplicationActivationPolicy {
-    const ENCODING: Encoding = NSInteger::ENCODING;
-}
-
-bitflags! {
-    #[derive(Debug, Clone, Copy)]
-    pub struct NSApplicationPresentationOptions: NSUInteger {
-        const NSApplicationPresentationDefault = 0;
-        const NSApplicationPresentationAutoHideDock = 1 << 0;
-        const NSApplicationPresentationHideDock = 1 << 1;
-        const NSApplicationPresentationAutoHideMenuBar = 1 << 2;
-        const NSApplicationPresentationHideMenuBar = 1 << 3;
-        const NSApplicationPresentationDisableAppleMenu = 1 << 4;
-        const NSApplicationPresentationDisableProcessSwitching = 1 << 5;
-        const NSApplicationPresentationDisableForceQuit = 1 << 6;
-        const NSApplicationPresentationDisableSessionTermination = 1 << 7;
-        const NSApplicationPresentationDisableHideApplication = 1 << 8;
-        const NSApplicationPresentationDisableMenuBarTransparency = 1 << 9;
-        const NSApplicationPresentationFullScreen = 1 << 10;
-        const NSApplicationPresentationAutoHideToolbar = 1 << 11;
-    }
-}
-
-unsafe impl Encode for NSApplicationPresentationOptions {
-    const ENCODING: Encoding = NSUInteger::ENCODING;
-}
-
-#[repr(usize)] // NSUInteger
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-pub enum NSRequestUserAttentionType {
-    NSCriticalRequest = 0,
-    NSInformationalRequest = 10,
-}
-
-unsafe impl Encode for NSRequestUserAttentionType {
-    const ENCODING: Encoding = NSUInteger::ENCODING;
-}

src/platform_impl/macos/appkit/button.rs

@@ -1,15 +0,0 @@
-use icrate::Foundation::NSObject;
-use objc2::{extern_class, mutability, ClassType};
-
-use super::{NSControl, NSResponder, NSView};
-
-extern_class!(
-    #[derive(Debug, PartialEq, Eq, Hash)]
-    pub(crate) struct NSButton;
-
-    unsafe impl ClassType for NSButton {
-        #[inherits(NSView, NSResponder, NSObject)]
-        type Super = NSControl;
-        type Mutability = mutability::InteriorMutable;
-    }
-);

src/platform_impl/macos/appkit/color.rs

@@ -1,28 +0,0 @@
-use icrate::Foundation::NSObject;
-use objc2::rc::Id;
-use objc2::{extern_class, extern_methods, mutability, ClassType};
-
-extern_class!(
-    /// An object that stores color data and sometimes opacity (alpha value).
-    ///
-    /// <https://developer.apple.com/documentation/appkit/nscolor?language=objc>
-    #[derive(Debug, PartialEq, Eq, Hash)]
-    pub(crate) struct NSColor;
-
-    unsafe impl ClassType for NSColor {
-        type Super = NSObject;
-        type Mutability = mutability::InteriorMutable;
-    }
-);
-
-// SAFETY: Documentation clearly states:
-// > Color objects are immutable and thread-safe
-unsafe impl Send for NSColor {}
-unsafe impl Sync for NSColor {}
-
-extern_methods!(
-    unsafe impl NSColor {
-        #[method_id(clearColor)]
-        pub fn clear() -> Id<Self>;
-    }
-);

src/platform_impl/macos/appkit/control.rs

@@ -1,25 +0,0 @@
-use icrate::Foundation::NSObject;
-use objc2::{extern_class, extern_methods, mutability, ClassType};
-
-use super::{NSResponder, NSView};
-
-extern_class!(
-    #[derive(Debug, PartialEq, Eq, Hash)]
-    pub(crate) struct NSControl;
-
-    unsafe impl ClassType for NSControl {
-        #[inherits(NSResponder, NSObject)]
-        type Super = NSView;
-        type Mutability = mutability::InteriorMutable;
-    }
-);
-
-extern_methods!(
-    unsafe impl NSControl {
-        #[method(setEnabled:)]
-        pub fn setEnabled(&self, enabled: bool);
-
-        #[method(isEnabled)]
-        pub fn isEnabled(&self) -> bool;
-    }
-);

src/platform_impl/macos/appkit/cursor.rs

@@ -1,241 +0,0 @@
-use once_cell::sync::Lazy;
-
-use icrate::ns_string;
-use icrate::Foundation::{
-    NSData, NSDictionary, NSNumber, NSObject, NSObjectProtocol, NSPoint, NSString,
-};
-use objc2::rc::{DefaultId, Id};
-use objc2::runtime::Sel;
-use objc2::{extern_class, extern_methods, msg_send_id, mutability, sel, ClassType};
-
-use super::NSImage;
-use crate::window::CursorIcon;
-
-extern_class!(
-    /// <https://developer.apple.com/documentation/appkit/nscursor?language=objc>
-    #[derive(Debug, PartialEq, Eq, Hash)]
-    pub(crate) struct NSCursor;
-
-    unsafe impl ClassType for NSCursor {
-        type Super = NSObject;
-        type Mutability = mutability::InteriorMutable;
-    }
-);
-
-// SAFETY: NSCursor is immutable, stated here:
-// https://developer.apple.com/documentation/appkit/nscursor/1527062-image?language=objc
-unsafe impl Send for NSCursor {}
-unsafe impl Sync for NSCursor {}
-
-macro_rules! def_cursor {
-    {$(
-        $(#[$($m:meta)*])*
-        pub fn $name:ident();
-    )*} => {$(
-        $(#[$($m)*])*
-        pub fn $name() -> Id<Self> {
-            unsafe { msg_send_id![Self::class(), $name] }
-        }
-    )*};
-}
-
-macro_rules! def_undocumented_cursor {
-    {$(
-        $(#[$($m:meta)*])*
-        pub fn $name:ident();
-    )*} => {$(
-        $(#[$($m)*])*
-        pub fn $name() -> Id<Self> {
-            unsafe { Self::from_selector(sel!($name)).unwrap_or_else(|| Default::default()) }
-        }
-    )*};
-}
-
-extern_methods!(
-    /// Documented cursors
-    unsafe impl NSCursor {
-        def_cursor!(
-            pub fn arrowCursor();
-            pub fn pointingHandCursor();
-            pub fn openHandCursor();
-            pub fn closedHandCursor();
-            pub fn IBeamCursor();
-            pub fn IBeamCursorForVerticalLayout();
-            pub fn dragCopyCursor();
-            pub fn dragLinkCursor();
-            pub fn operationNotAllowedCursor();
-            pub fn contextualMenuCursor();
-            pub fn crosshairCursor();
-            pub fn resizeRightCursor();
-            pub fn resizeUpCursor();
-            pub fn resizeLeftCursor();
-            pub fn resizeDownCursor();
-            pub fn resizeLeftRightCursor();
-            pub fn resizeUpDownCursor();
-        );
-
-        // Creating cursors should be thread-safe, though using them for anything probably isn't.
-        pub fn new(image: &NSImage, hotSpot: NSPoint) -> Id<Self> {
-            unsafe { msg_send_id![Self::alloc(), initWithImage: image, hotSpot: hotSpot] }
-        }
-
-        pub fn invisible() -> Id<Self> {
-            // 16x16 GIF data for invisible cursor
-            // You can reproduce this via ImageMagick.
-            // $ convert -size 16x16 xc:none cursor.gif
-            static CURSOR_BYTES: &[u8] = &[
-                0x47, 0x49, 0x46, 0x38, 0x39, 0x61, 0x10, 0x00, 0x10, 0x00, 0xF0, 0x00, 0x00, 0x00,
-                0x00, 0x00, 0x00, 0x00, 0x00, 0x21, 0xF9, 0x04, 0x01, 0x00, 0x00, 0x00, 0x00, 0x2C,
-                0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x10, 0x00, 0x00, 0x02, 0x0E, 0x84, 0x8F, 0xA9,
-                0xCB, 0xED, 0x0F, 0xA3, 0x9C, 0xB4, 0xDA, 0x8B, 0xB3, 0x3E, 0x05, 0x00, 0x3B,
-            ];
-
-            static CURSOR: Lazy<Id<NSCursor>> = Lazy::new(|| {
-                // TODO: Consider using `dataWithBytesNoCopy:`
-                let data = NSData::with_bytes(CURSOR_BYTES);
-                let image = NSImage::new_with_data(&data);
-                NSCursor::new(&image, NSPoint::new(0.0, 0.0))
-            });
-
-            CURSOR.clone()
-        }
-    }
-
-    /// Undocumented cursors
-    unsafe impl NSCursor {
-        #[method(respondsToSelector:)]
-        fn class_responds_to(sel: Sel) -> bool;
-
-        #[method_id(performSelector:)]
-        unsafe fn from_selector_unchecked(sel: Sel) -> Id<Self>;
-
-        unsafe fn from_selector(sel: Sel) -> Option<Id<Self>> {
-            if Self::class_responds_to(sel) {
-                Some(unsafe { Self::from_selector_unchecked(sel) })
-            } else {
-                warn!("Cursor `{:?}` appears to be invalid", sel);
-                None
-            }
-        }
-
-        def_undocumented_cursor!(
-            // Undocumented cursors: https://stackoverflow.com/a/46635398/5435443
-            pub fn _helpCursor();
-            pub fn _zoomInCursor();
-            pub fn _zoomOutCursor();
-            pub fn _windowResizeNorthEastCursor();
-            pub fn _windowResizeNorthWestCursor();
-            pub fn _windowResizeSouthEastCursor();
-            pub fn _windowResizeSouthWestCursor();
-            pub fn _windowResizeNorthEastSouthWestCursor();
-            pub fn _windowResizeNorthWestSouthEastCursor();
-
-            // While these two are available, the former just loads a white arrow,
-            // and the latter loads an ugly deflated beachball!
-            // pub fn _moveCursor();
-            // pub fn _waitCursor();
-
-            // An even more undocumented cursor...
-            // https://bugs.eclipse.org/bugs/show_bug.cgi?id=522349
-            pub fn busyButClickableCursor();
-        );
-    }
-
-    /// Webkit cursors
-    unsafe impl NSCursor {
-        // Note that loading `busybutclickable` with this code won't animate
-        // the frames; instead you'll just get them all in a column.
-        unsafe fn load_webkit_cursor(name: &NSString) -> Id<Self> {
-            // Snatch a cursor from WebKit; They fit the style of the native
-            // cursors, and will seem completely standard to macOS users.
-            //
-            // https://stackoverflow.com/a/21786835/5435443
-            let root = ns_string!("/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/Resources/cursors");
-            let cursor_path = root.stringByAppendingPathComponent(name);
-
-            let pdf_path = cursor_path.stringByAppendingPathComponent(ns_string!("cursor.pdf"));
-            let image = NSImage::new_by_referencing_file(&pdf_path);
-
-            // TODO: Handle PLists better
-            let info_path = cursor_path.stringByAppendingPathComponent(ns_string!("info.plist"));
-            let info: Id<NSDictionary<NSObject, NSObject>> = unsafe {
-                msg_send_id![
-                    <NSDictionary<NSObject, NSObject>>::class(),
-                    dictionaryWithContentsOfFile: &*info_path,
-                ]
-            };
-            let mut x = 0.0;
-            if let Some(n) = info.get(&*ns_string!("hotx")) {
-                if n.is_kind_of::<NSNumber>() {
-                    let ptr: *const NSObject = n;
-                    let ptr: *const NSNumber = ptr.cast();
-                    x = unsafe { &*ptr }.as_cgfloat()
-                }
-            }
-            let mut y = 0.0;
-            if let Some(n) = info.get(&*ns_string!("hotx")) {
-                if n.is_kind_of::<NSNumber>() {
-                    let ptr: *const NSObject = n;
-                    let ptr: *const NSNumber = ptr.cast();
-                    y = unsafe { &*ptr }.as_cgfloat()
-                }
-            }
-
-            let hotspot = NSPoint::new(x, y);
-            Self::new(&image, hotspot)
-        }
-
-        pub fn moveCursor() -> Id<Self> {
-            unsafe { Self::load_webkit_cursor(ns_string!("move")) }
-        }
-
-        pub fn cellCursor() -> Id<Self> {
-            unsafe { Self::load_webkit_cursor(ns_string!("cell")) }
-        }
-    }
-);
-
-impl NSCursor {
-    pub fn from_icon(icon: CursorIcon) -> Id<Self> {
-        match icon {
-            CursorIcon::Default => Default::default(),
-            CursorIcon::Pointer => Self::pointingHandCursor(),
-            CursorIcon::Grab => Self::openHandCursor(),
-            CursorIcon::Grabbing => Self::closedHandCursor(),
-            CursorIcon::Text => Self::IBeamCursor(),
-            CursorIcon::VerticalText => Self::IBeamCursorForVerticalLayout(),
-            CursorIcon::Copy => Self::dragCopyCursor(),
-            CursorIcon::Alias => Self::dragLinkCursor(),
-            CursorIcon::NotAllowed | CursorIcon::NoDrop => Self::operationNotAllowedCursor(),
-            CursorIcon::ContextMenu => Self::contextualMenuCursor(),
-            CursorIcon::Crosshair => Self::crosshairCursor(),
-            CursorIcon::EResize => Self::resizeRightCursor(),
-            CursorIcon::NResize => Self::resizeUpCursor(),
-            CursorIcon::WResize => Self::resizeLeftCursor(),
-            CursorIcon::SResize => Self::resizeDownCursor(),
-            CursorIcon::EwResize | CursorIcon::ColResize => Self::resizeLeftRightCursor(),
-            CursorIcon::NsResize | CursorIcon::RowResize => Self::resizeUpDownCursor(),
-            CursorIcon::Help => Self::_helpCursor(),
-            CursorIcon::ZoomIn => Self::_zoomInCursor(),
-            CursorIcon::ZoomOut => Self::_zoomOutCursor(),
-            CursorIcon::NeResize => Self::_windowResizeNorthEastCursor(),
-            CursorIcon::NwResize => Self::_windowResizeNorthWestCursor(),
-            CursorIcon::SeResize => Self::_windowResizeSouthEastCursor(),
-            CursorIcon::SwResize => Self::_windowResizeSouthWestCursor(),
-            CursorIcon::NeswResize => Self::_windowResizeNorthEastSouthWestCursor(),
-            CursorIcon::NwseResize => Self::_windowResizeNorthWestSouthEastCursor(),
-            // This is the wrong semantics for `Wait`, but it's the same as
-            // what's used in Safari and Chrome.
-            CursorIcon::Wait | CursorIcon::Progress => Self::busyButClickableCursor(),
-            CursorIcon::Move | CursorIcon::AllScroll => Self::moveCursor(),
-            CursorIcon::Cell => Self::cellCursor(),
-            _ => Default::default(),
-        }
-    }
-}
-
-impl DefaultId for NSCursor {
-    fn default_id() -> Id<Self> {
-        Self::arrowCursor()
-    }
-}

src/platform_impl/macos/appkit/event.rs

@@ -1,308 +0,0 @@
-use std::os::raw::c_ushort;
-
-use icrate::Foundation::{
-    CGFloat, NSCopying, NSInteger, NSObject, NSPoint, NSString, NSTimeInterval, NSUInteger,
-};
-use objc2::encode::{Encode, Encoding};
-use objc2::rc::Id;
-use objc2::{extern_class, extern_methods, mutability, ClassType};
-
-extern_class!(
-    #[derive(Debug, PartialEq, Eq, Hash)]
-    pub(crate) struct NSEvent;
-
-    unsafe impl ClassType for NSEvent {
-        type Super = NSObject;
-        type Mutability = mutability::InteriorMutable;
-    }
-);
-
-// > Safely handled only on the same thread, whether that be the main thread
-// > or a secondary thread; otherwise you run the risk of having events get
-// > out of sequence.
-// <https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/CocoaFundamentals/AddingBehaviortoaCocoaProgram/AddingBehaviorCocoa.html#//apple_ref/doc/uid/TP40002974-CH5-SW47>
-// <https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/Multithreading/ThreadSafetySummary/ThreadSafetySummary.html#//apple_ref/doc/uid/10000057i-CH12-123383>
-
-extern_methods!(
-    unsafe impl NSEvent {
-        #[method_id(
-            otherEventWithType:
-            location:
-            modifierFlags:
-            timestamp:
-            windowNumber:
-            context:
-            subtype:
-            data1:
-            data2:
-        )]
-        unsafe fn otherEventWithType(
-            type_: NSEventType,
-            location: NSPoint,
-            flags: NSEventModifierFlags,
-            time: NSTimeInterval,
-            window_num: NSInteger,
-            context: Option<&NSObject>, // NSGraphicsContext
-            subtype: NSEventSubtype,
-            data1: NSInteger,
-            data2: NSInteger,
-        ) -> Id<Self>;
-
-        pub fn dummy() -> Id<Self> {
-            unsafe {
-                Self::otherEventWithType(
-                    NSEventType::NSApplicationDefined,
-                    NSPoint::new(0.0, 0.0),
-                    NSEventModifierFlags::empty(),
-                    0.0,
-                    0,
-                    None,
-                    NSEventSubtype::NSWindowExposedEventType,
-                    0,
-                    0,
-                )
-            }
-        }
-
-        #[method_id(
-            keyEventWithType:
-            location:
-            modifierFlags:
-            timestamp:
-            windowNumber:
-            context:
-            characters:
-            charactersIgnoringModifiers:
-            isARepeat:
-            keyCode:
-        )]
-        pub fn keyEventWithType(
-            type_: NSEventType,
-            location: NSPoint,
-            modifier_flags: NSEventModifierFlags,
-            timestamp: NSTimeInterval,
-            window_num: NSInteger,
-            context: Option<&NSObject>,
-            characters: &NSString,
-            characters_ignoring_modifiers: &NSString,
-            is_a_repeat: bool,
-            scancode: c_ushort,
-        ) -> Id<Self>;
-
-        #[method(locationInWindow)]
-        pub fn locationInWindow(&self) -> NSPoint;
-
-        // TODO: MainThreadMarker
-        #[method(pressedMouseButtons)]
-        pub fn pressedMouseButtons() -> NSUInteger;
-
-        #[method(modifierFlags)]
-        pub fn modifierFlags(&self) -> NSEventModifierFlags;
-
-        #[method(type)]
-        pub fn type_(&self) -> NSEventType;
-
-        #[method(keyCode)]
-        pub fn key_code(&self) -> c_ushort;
-
-        #[method(magnification)]
-        pub fn magnification(&self) -> CGFloat;
-
-        #[method(phase)]
-        pub fn phase(&self) -> NSEventPhase;
-
-        #[method(momentumPhase)]
-        pub fn momentumPhase(&self) -> NSEventPhase;
-
-        #[method(deltaX)]
-        pub fn deltaX(&self) -> CGFloat;
-
-        #[method(deltaY)]
-        pub fn deltaY(&self) -> CGFloat;
-
-        #[method(buttonNumber)]
-        pub fn buttonNumber(&self) -> NSInteger;
-
-        #[method(scrollingDeltaX)]
-        pub fn scrollingDeltaX(&self) -> CGFloat;
-
-        #[method(scrollingDeltaY)]
-        pub fn scrollingDeltaY(&self) -> CGFloat;
-
-        #[method(hasPreciseScrollingDeltas)]
-        pub fn hasPreciseScrollingDeltas(&self) -> bool;
-
-        #[method(rotation)]
-        pub fn rotation(&self) -> f32;
-
-        #[method(pressure)]
-        pub fn pressure(&self) -> f32;
-
-        #[method(stage)]
-        pub fn stage(&self) -> NSInteger;
-
-        #[method(isARepeat)]
-        pub fn is_a_repeat(&self) -> bool;
-
-        #[method(windowNumber)]
-        pub fn window_number(&self) -> NSInteger;
-
-        #[method(timestamp)]
-        pub fn timestamp(&self) -> NSTimeInterval;
-
-        #[method_id(characters)]
-        pub fn characters(&self) -> Option<Id<NSString>>;
-
-        #[method_id(charactersIgnoringModifiers)]
-        pub fn charactersIgnoringModifiers(&self) -> Option<Id<NSString>>;
-
-        pub fn lshift_pressed(&self) -> bool {
-            let raw_modifiers = self.modifierFlags().bits() as u32;
-            raw_modifiers & NX_DEVICELSHIFTKEYMASK != 0
-        }
-
-        pub fn rshift_pressed(&self) -> bool {
-            let raw_modifiers = self.modifierFlags().bits() as u32;
-            raw_modifiers & NX_DEVICERSHIFTKEYMASK != 0
-        }
-
-        pub fn lctrl_pressed(&self) -> bool {
-            let raw_modifiers = self.modifierFlags().bits() as u32;
-            raw_modifiers & NX_DEVICELCTLKEYMASK != 0
-        }
-
-        pub fn rctrl_pressed(&self) -> bool {
-            let raw_modifiers = self.modifierFlags().bits() as u32;
-            raw_modifiers & NX_DEVICERCTLKEYMASK != 0
-        }
-
-        pub fn lalt_pressed(&self) -> bool {
-            let raw_modifiers = self.modifierFlags().bits() as u32;
-            raw_modifiers & NX_DEVICELALTKEYMASK != 0
-        }
-
-        pub fn ralt_pressed(&self) -> bool {
-            let raw_modifiers = self.modifierFlags().bits() as u32;
-            raw_modifiers & NX_DEVICERALTKEYMASK != 0
-        }
-
-        pub fn lcmd_pressed(&self) -> bool {
-            let raw_modifiers = self.modifierFlags().bits() as u32;
-            raw_modifiers & NX_DEVICELCMDKEYMASK != 0
-        }
-
-        pub fn rcmd_pressed(&self) -> bool {
-            let raw_modifiers = self.modifierFlags().bits() as u32;
-            raw_modifiers & NX_DEVICERCMDKEYMASK != 0
-        }
-    }
-);
-
-unsafe impl NSCopying for NSEvent {}
-
-// The values are from the https://github.com/apple-oss-distributions/IOHIDFamily/blob/19666c840a6d896468416ff0007040a10b7b46b8/IOHIDSystem/IOKit/hidsystem/IOLLEvent.h#L258-L259
-const NX_DEVICELCTLKEYMASK: u32 = 0x00000001;
-const NX_DEVICELSHIFTKEYMASK: u32 = 0x00000002;
-const NX_DEVICERSHIFTKEYMASK: u32 = 0x00000004;
-const NX_DEVICELCMDKEYMASK: u32 = 0x00000008;
-const NX_DEVICERCMDKEYMASK: u32 = 0x00000010;
-const NX_DEVICELALTKEYMASK: u32 = 0x00000020;
-const NX_DEVICERALTKEYMASK: u32 = 0x00000040;
-const NX_DEVICERCTLKEYMASK: u32 = 0x00002000;
-
-bitflags! {
-    #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-    pub struct NSEventModifierFlags: NSUInteger {
-        const NSAlphaShiftKeyMask                     = 1 << 16;
-        const NSShiftKeyMask                          = 1 << 17;
-        const NSControlKeyMask                        = 1 << 18;
-        const NSAlternateKeyMask                      = 1 << 19;
-        const NSCommandKeyMask                        = 1 << 20;
-        const NSNumericPadKeyMask                     = 1 << 21;
-        const NSHelpKeyMask                           = 1 << 22;
-        const NSFunctionKeyMask                       = 1 << 23;
-        const NSDeviceIndependentModifierFlagsMask    = 0xffff0000;
-    }
-}
-
-unsafe impl Encode for NSEventModifierFlags {
-    const ENCODING: Encoding = NSUInteger::ENCODING;
-}
-
-bitflags! {
-    #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-    pub struct NSEventPhase: NSUInteger {
-       const NSEventPhaseNone        = 0;
-       const NSEventPhaseBegan       = 0x1 << 0;
-       const NSEventPhaseStationary  = 0x1 << 1;
-       const NSEventPhaseChanged     = 0x1 << 2;
-       const NSEventPhaseEnded       = 0x1 << 3;
-       const NSEventPhaseCancelled   = 0x1 << 4;
-       const NSEventPhaseMayBegin    = 0x1 << 5;
-    }
-}
-
-unsafe impl Encode for NSEventPhase {
-    const ENCODING: Encoding = NSUInteger::ENCODING;
-}
-
-#[allow(dead_code)]
-#[repr(i16)] // short
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-pub enum NSEventSubtype {
-    // TODO: Not sure what these values are
-    // NSMouseEventSubtype           = NX_SUBTYPE_DEFAULT,
-    // NSTabletPointEventSubtype     = NX_SUBTYPE_TABLET_POINT,
-    // NSTabletProximityEventSubtype = NX_SUBTYPE_TABLET_PROXIMITY
-    // NSTouchEventSubtype           = NX_SUBTYPE_MOUSE_TOUCH,
-    NSWindowExposedEventType = 0,
-    NSApplicationActivatedEventType = 1,
-    NSApplicationDeactivatedEventType = 2,
-    NSWindowMovedEventType = 4,
-    NSScreenChangedEventType = 8,
-    NSAWTEventType = 16,
-}
-
-unsafe impl Encode for NSEventSubtype {
-    const ENCODING: Encoding = i16::ENCODING;
-}
-
-#[allow(dead_code)]
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-#[repr(usize)] // NSUInteger
-pub enum NSEventType {
-    NSLeftMouseDown = 1,
-    NSLeftMouseUp = 2,
-    NSRightMouseDown = 3,
-    NSRightMouseUp = 4,
-    NSMouseMoved = 5,
-    NSLeftMouseDragged = 6,
-    NSRightMouseDragged = 7,
-    NSMouseEntered = 8,
-    NSMouseExited = 9,
-    NSKeyDown = 10,
-    NSKeyUp = 11,
-    NSFlagsChanged = 12,
-    NSAppKitDefined = 13,
-    NSSystemDefined = 14,
-    NSApplicationDefined = 15,
-    NSPeriodic = 16,
-    NSCursorUpdate = 17,
-    NSScrollWheel = 22,
-    NSTabletPoint = 23,
-    NSTabletProximity = 24,
-    NSOtherMouseDown = 25,
-    NSOtherMouseUp = 26,
-    NSOtherMouseDragged = 27,
-    NSEventTypeGesture = 29,
-    NSEventTypeMagnify = 30,
-    NSEventTypeSwipe = 31,
-    NSEventTypeRotate = 18,
-    NSEventTypeBeginGesture = 19,
-    NSEventTypeEndGesture = 20,
-    NSEventTypePressure = 34,
-}
-
-unsafe impl Encode for NSEventType {
-    const ENCODING: Encoding = NSUInteger::ENCODING;
-}

src/platform_impl/macos/appkit/image.rs

@@ -1,36 +0,0 @@
-use icrate::Foundation::{NSData, NSObject, NSString};
-use objc2::rc::Id;
-use objc2::{extern_class, extern_methods, msg_send_id, mutability, ClassType};
-
-extern_class!(
-    // TODO: Can this be mutable?
-    #[derive(Debug, PartialEq, Eq, Hash)]
-    pub(crate) struct NSImage;
-
-    unsafe impl ClassType for NSImage {
-        type Super = NSObject;
-        type Mutability = mutability::InteriorMutable;
-    }
-);
-
-// Documented Thread-Unsafe, but:
-// > One thread can create an NSImage object, draw to the image buffer,
-// > and pass it off to the main thread for drawing. The underlying image
-// > cache is shared among all threads.
-// <https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/Multithreading/ThreadSafetySummary/ThreadSafetySummary.html#//apple_ref/doc/uid/10000057i-CH12-126728>
-//
-// So really only unsafe to mutate on several threads.
-unsafe impl Send for NSImage {}
-unsafe impl Sync for NSImage {}
-
-extern_methods!(
-    unsafe impl NSImage {
-        pub fn new_by_referencing_file(path: &NSString) -> Id<Self> {
-            unsafe { msg_send_id![Self::alloc(), initByReferencingFile: path] }
-        }
-
-        pub fn new_with_data(data: &NSData) -> Id<Self> {
-            unsafe { msg_send_id![Self::alloc(), initWithData: data] }
-        }
-    }
-);

src/platform_impl/macos/appkit/menu.rs

@@ -1,25 +0,0 @@
-use icrate::Foundation::NSObject;
-use objc2::rc::Id;
-use objc2::{extern_class, extern_methods, mutability, ClassType};
-
-use super::NSMenuItem;
-
-extern_class!(
-    #[derive(Debug, PartialEq, Eq, Hash)]
-    pub(crate) struct NSMenu;
-
-    unsafe impl ClassType for NSMenu {
-        type Super = NSObject;
-        type Mutability = mutability::InteriorMutable;
-    }
-);
-
-extern_methods!(
-    unsafe impl NSMenu {
-        #[method_id(new)]
-        pub fn new() -> Id<Self>;
-
-        #[method(addItem:)]
-        pub fn addItem(&self, item: &NSMenuItem);
-    }
-);

src/platform_impl/macos/appkit/menu_item.rs

@@ -1,43 +0,0 @@
-use icrate::Foundation::{NSObject, NSString};
-use objc2::rc::Id;
-use objc2::runtime::Sel;
-use objc2::{extern_class, extern_methods, msg_send_id, mutability, ClassType};
-
-use super::{NSEventModifierFlags, NSMenu};
-
-extern_class!(
-    #[derive(Debug, PartialEq, Eq, Hash)]
-    pub(crate) struct NSMenuItem;
-
-    unsafe impl ClassType for NSMenuItem {
-        type Super = NSObject;
-        type Mutability = mutability::InteriorMutable;
-    }
-);
-
-extern_methods!(
-    unsafe impl NSMenuItem {
-        #[method_id(new)]
-        pub fn new() -> Id<Self>;
-
-        pub fn newWithTitle(title: &NSString, action: Sel, key_equivalent: &NSString) -> Id<Self> {
-            unsafe {
-                msg_send_id![
-                    Self::alloc(),
-                    initWithTitle: title,
-                    action: action,
-                    keyEquivalent: key_equivalent,
-                ]
-            }
-        }
-
-        #[method_id(separatorItem)]
-        pub fn separatorItem() -> Id<Self>;
-
-        #[method(setKeyEquivalentModifierMask:)]
-        pub fn setKeyEquivalentModifierMask(&self, mask: NSEventModifierFlags);
-
-        #[method(setSubmenu:)]
-        pub fn setSubmenu(&self, submenu: &NSMenu);
-    }
-);

src/platform_impl/macos/appkit/mod.rs

@@ -1,66 +0,0 @@
-//! Safe bindings for the AppKit framework.
-//!
-//! These are split out from the rest of `winit` to make safety easier to review.
-//! In the future, these should probably live in another crate like `cacao`.
-//!
-//! TODO: Main thread safety.
-// Objective-C methods have different conventions, and it's much easier to
-// understand if we just use the same names
-#![allow(non_snake_case)]
-#![allow(clippy::too_many_arguments)]
-#![allow(clippy::enum_variant_names)]
-#![allow(non_upper_case_globals)]
-
-mod appearance;
-mod application;
-mod button;
-mod color;
-mod control;
-mod cursor;
-mod event;
-mod image;
-mod menu;
-mod menu_item;
-mod pasteboard;
-mod responder;
-mod screen;
-mod tab_group;
-mod text_input_client;
-mod text_input_context;
-mod version;
-mod view;
-mod window;
-
-pub(crate) use self::appearance::NSAppearance;
-pub(crate) use self::application::{
-    NSApp, NSApplication, NSApplicationActivationPolicy, NSApplicationPresentationOptions,
-    NSRequestUserAttentionType,
-};
-pub(crate) use self::button::NSButton;
-pub(crate) use self::color::NSColor;
-pub(crate) use self::control::NSControl;
-pub(crate) use self::cursor::NSCursor;
-#[allow(unused_imports)]
-pub(crate) use self::event::{
-    NSEvent, NSEventModifierFlags, NSEventPhase, NSEventSubtype, NSEventType,
-};
-pub(crate) use self::image::NSImage;
-pub(crate) use self::menu::NSMenu;
-pub(crate) use self::menu_item::NSMenuItem;
-pub(crate) use self::pasteboard::{NSFilenamesPboardType, NSPasteboard, NSPasteboardType};
-pub(crate) use self::responder::NSResponder;
-#[allow(unused_imports)]
-pub(crate) use self::screen::{NSDeviceDescriptionKey, NSScreen};
-pub(crate) use self::tab_group::NSWindowTabGroup;
-pub(crate) use self::text_input_client::NSTextInputClient;
-pub(crate) use self::text_input_context::NSTextInputContext;
-pub(crate) use self::version::NSAppKitVersion;
-pub(crate) use self::view::{NSTrackingRectTag, NSView};
-pub(crate) use self::window::{
-    NSBackingStoreType, NSWindow, NSWindowButton, NSWindowLevel, NSWindowOcclusionState,
-    NSWindowOrderingMode, NSWindowSharingType, NSWindowStyleMask, NSWindowTabbingMode,
-    NSWindowTitleVisibility,
-};
-
-#[link(name = "AppKit", kind = "framework")]
-extern "C" {}

src/platform_impl/macos/appkit/pasteboard.rs

@@ -1,26 +0,0 @@
-use icrate::Foundation::{NSObject, NSString};
-use objc2::rc::Id;
-use objc2::{extern_class, extern_methods, mutability, ClassType};
-
-extern_class!(
-    #[derive(Debug, PartialEq, Eq, Hash)]
-    pub(crate) struct NSPasteboard;
-
-    unsafe impl ClassType for NSPasteboard {
-        type Super = NSObject;
-        type Mutability = mutability::InteriorMutable;
-    }
-);
-
-extern_methods!(
-    unsafe impl NSPasteboard {
-        #[method_id(propertyListForType:)]
-        pub fn propertyListForType(&self, type_: &NSPasteboardType) -> Id<NSObject>;
-    }
-);
-
-pub type NSPasteboardType = NSString;
-
-extern "C" {
-    pub static NSFilenamesPboardType: &'static NSPasteboardType;
-}

src/platform_impl/macos/appkit/responder.rs

@@ -1,23 +0,0 @@
-use icrate::Foundation::{NSArray, NSObject};
-use objc2::{extern_class, extern_methods, mutability, ClassType};
-
-use super::NSEvent;
-
-extern_class!(
-    #[derive(Debug, PartialEq, Eq, Hash)]
-    pub struct NSResponder;
-
-    unsafe impl ClassType for NSResponder {
-        type Super = NSObject;
-        type Mutability = mutability::InteriorMutable;
-    }
-);
-
-// Documented as "Thread-Unsafe".
-
-extern_methods!(
-    unsafe impl NSResponder {
-        #[method(interpretKeyEvents:)]
-        pub(crate) unsafe fn interpretKeyEvents(&self, events: &NSArray<NSEvent>);
-    }
-);

src/platform_impl/macos/appkit/screen.rs

@@ -1,65 +0,0 @@
-use icrate::ns_string;
-use icrate::Foundation::{CGFloat, NSArray, NSDictionary, NSNumber, NSObject, NSRect, NSString};
-use objc2::rc::Id;
-use objc2::runtime::AnyObject;
-use objc2::{extern_class, extern_methods, mutability, ClassType};
-
-extern_class!(
-    #[derive(Debug, PartialEq, Eq, Hash)]
-    pub(crate) struct NSScreen;
-
-    unsafe impl ClassType for NSScreen {
-        type Super = NSObject;
-        type Mutability = mutability::InteriorMutable;
-    }
-);
-
-// TODO: Main thread marker!
-
-extern_methods!(
-    unsafe impl NSScreen {
-        /// The application object must have been created.
-        #[method_id(mainScreen)]
-        pub fn main() -> Option<Id<Self>>;
-
-        /// The application object must have been created.
-        #[method_id(screens)]
-        pub fn screens() -> Id<NSArray<Self>>;
-
-        #[method(frame)]
-        pub fn frame(&self) -> NSRect;
-
-        #[method(visibleFrame)]
-        pub fn visibleFrame(&self) -> NSRect;
-
-        #[method_id(deviceDescription)]
-        pub fn deviceDescription(&self) -> Id<NSDictionary<NSDeviceDescriptionKey, AnyObject>>;
-
-        pub fn display_id(&self) -> u32 {
-            let key = ns_string!("NSScreenNumber");
-
-            objc2::rc::autoreleasepool(|_| {
-                let device_description = self.deviceDescription();
-
-                // Retrieve the CGDirectDisplayID associated with this screen
-                //
-                // SAFETY: The value from @"NSScreenNumber" in deviceDescription is guaranteed
-                // to be an NSNumber. See documentation for `deviceDescription` for details:
-                // <https://developer.apple.com/documentation/appkit/nsscreen/1388360-devicedescription?language=objc>
-                let obj = device_description
-                    .get(key)
-                    .expect("failed getting screen display id from device description");
-                let obj: *const AnyObject = obj;
-                let obj: *const NSNumber = obj.cast();
-                let obj: &NSNumber = unsafe { &*obj };
-
-                obj.as_u32()
-            })
-        }
-
-        #[method(backingScaleFactor)]
-        pub fn backingScaleFactor(&self) -> CGFloat;
-    }
-);
-
-pub type NSDeviceDescriptionKey = NSString;

src/platform_impl/macos/appkit/tab_group.rs

@@ -1,31 +0,0 @@
-use icrate::Foundation::{NSArray, NSObject};
-use objc2::rc::Id;
-use objc2::{extern_class, extern_methods, mutability, ClassType};
-
-use super::NSWindow;
-
-extern_class!(
-    #[derive(Debug, PartialEq, Eq, Hash)]
-    pub(crate) struct NSWindowTabGroup;
-
-    unsafe impl ClassType for NSWindowTabGroup {
-        type Super = NSObject;
-        type Mutability = mutability::InteriorMutable;
-    }
-);
-
-extern_methods!(
-    unsafe impl NSWindowTabGroup {
-        #[method(selectNextTab)]
-        pub fn selectNextTab(&self);
-
-        #[method(selectPreviousTab)]
-        pub fn selectPreviousTab(&self);
-
-        #[method_id(windows)]
-        pub fn tabbedWindows(&self) -> Option<Id<NSArray<NSWindow>>>;
-
-        #[method(setSelectedWindow:)]
-        pub fn setSelectedWindow(&self, window: &NSWindow);
-    }
-);

src/platform_impl/macos/appkit/text_input_client.rs

@@ -1,9 +0,0 @@
-use objc2::{extern_protocol, ProtocolType};
-
-extern_protocol!(
-    pub(crate) unsafe trait NSTextInputClient {
-        // TODO: Methods
-    }
-
-    unsafe impl ProtocolType for dyn NSTextInputClient {}
-);

src/platform_impl/macos/appkit/text_input_context.rs

@@ -1,29 +0,0 @@
-use icrate::Foundation::{NSObject, NSString};
-use objc2::rc::Id;
-use objc2::{extern_class, extern_methods, mutability, ClassType};
-
-type NSTextInputSourceIdentifier = NSString;
-
-extern_class!(
-    /// Main-Thread-Only!
-    #[derive(Debug, PartialEq, Eq, Hash)]
-    pub(crate) struct NSTextInputContext;
-
-    unsafe impl ClassType for NSTextInputContext {
-        type Super = NSObject;
-        type Mutability = mutability::InteriorMutable;
-    }
-);
-
-extern_methods!(
-    unsafe impl NSTextInputContext {
-        #[method(invalidateCharacterCoordinates)]
-        pub fn invalidateCharacterCoordinates(&self);
-
-        #[method(discardMarkedText)]
-        pub fn discardMarkedText(&self);
-
-        #[method_id(selectedKeyboardInputSource)]
-        pub fn selectedKeyboardInputSource(&self) -> Option<Id<NSTextInputSourceIdentifier>>;
-    }
-);

src/platform_impl/macos/appkit/version.rs

@@ -1,62 +0,0 @@
-#[repr(transparent)]
-#[derive(PartialEq, PartialOrd, Debug, Clone, Copy)]
-pub struct NSAppKitVersion(f64);
-
-#[allow(dead_code)]
-#[allow(non_upper_case_globals)]
-impl NSAppKitVersion {
-    pub fn current() -> Self {
-        extern "C" {
-            static NSAppKitVersionNumber: NSAppKitVersion;
-        }
-
-        unsafe { NSAppKitVersionNumber }
-    }
-
-    pub fn floor(self) -> Self {
-        Self(self.0.floor())
-    }
-
-    pub const NSAppKitVersionNumber10_0: Self = Self(577.0);
-    pub const NSAppKitVersionNumber10_1: Self = Self(620.0);
-    pub const NSAppKitVersionNumber10_2: Self = Self(663.0);
-    pub const NSAppKitVersionNumber10_2_3: Self = Self(663.6);
-    pub const NSAppKitVersionNumber10_3: Self = Self(743.0);
-    pub const NSAppKitVersionNumber10_3_2: Self = Self(743.14);
-    pub const NSAppKitVersionNumber10_3_3: Self = Self(743.2);
-    pub const NSAppKitVersionNumber10_3_5: Self = Self(743.24);
-    pub const NSAppKitVersionNumber10_3_7: Self = Self(743.33);
-    pub const NSAppKitVersionNumber10_3_9: Self = Self(743.36);
-    pub const NSAppKitVersionNumber10_4: Self = Self(824.0);
-    pub const NSAppKitVersionNumber10_4_1: Self = Self(824.1);
-    pub const NSAppKitVersionNumber10_4_3: Self = Self(824.23);
-    pub const NSAppKitVersionNumber10_4_4: Self = Self(824.33);
-    pub const NSAppKitVersionNumber10_4_7: Self = Self(824.41);
-    pub const NSAppKitVersionNumber10_5: Self = Self(949.0);
-    pub const NSAppKitVersionNumber10_5_2: Self = Self(949.27);
-    pub const NSAppKitVersionNumber10_5_3: Self = Self(949.33);
-    pub const NSAppKitVersionNumber10_6: Self = Self(1038.0);
-    pub const NSAppKitVersionNumber10_7: Self = Self(1138.0);
-    pub const NSAppKitVersionNumber10_7_2: Self = Self(1138.23);
-    pub const NSAppKitVersionNumber10_7_3: Self = Self(1138.32);
-    pub const NSAppKitVersionNumber10_7_4: Self = Self(1138.47);
-    pub const NSAppKitVersionNumber10_8: Self = Self(1187.0);
-    pub const NSAppKitVersionNumber10_9: Self = Self(1265.0);
-    pub const NSAppKitVersionNumber10_10: Self = Self(1343.0);
-    pub const NSAppKitVersionNumber10_10_2: Self = Self(1344.0);
-    pub const NSAppKitVersionNumber10_10_3: Self = Self(1347.0);
-    pub const NSAppKitVersionNumber10_10_4: Self = Self(1348.0);
-    pub const NSAppKitVersionNumber10_10_5: Self = Self(1348.0);
-    pub const NSAppKitVersionNumber10_10_Max: Self = Self(1349.0);
-    pub const NSAppKitVersionNumber10_11: Self = Self(1404.0);
-    pub const NSAppKitVersionNumber10_11_1: Self = Self(1404.13);
-    pub const NSAppKitVersionNumber10_11_2: Self = Self(1404.34);
-    pub const NSAppKitVersionNumber10_11_3: Self = Self(1404.34);
-    pub const NSAppKitVersionNumber10_12: Self = Self(1504.0);
-    pub const NSAppKitVersionNumber10_12_1: Self = Self(1504.60);
-    pub const NSAppKitVersionNumber10_12_2: Self = Self(1504.76);
-    pub const NSAppKitVersionNumber10_13: Self = Self(1561.0);
-    pub const NSAppKitVersionNumber10_13_1: Self = Self(1561.1);
-    pub const NSAppKitVersionNumber10_13_2: Self = Self(1561.2);
-    pub const NSAppKitVersionNumber10_13_4: Self = Self(1561.4);
-}

src/platform_impl/macos/appkit/view.rs

@@ -1,95 +0,0 @@
-use std::ffi::c_void;
-use std::num::NonZeroIsize;
-use std::ptr;
-
-use icrate::Foundation::{NSObject, NSPoint, NSRect};
-use objc2::rc::Id;
-use objc2::runtime::AnyObject;
-use objc2::{extern_class, extern_methods, mutability, ClassType};
-
-use super::{NSCursor, NSResponder, NSTextInputContext, NSWindow};
-
-extern_class!(
-    #[derive(Debug, PartialEq, Eq, Hash)]
-    pub(crate) struct NSView;
-
-    unsafe impl ClassType for NSView {
-        #[inherits(NSObject)]
-        type Super = NSResponder;
-        type Mutability = mutability::InteriorMutable;
-    }
-);
-
-// Documented as "Main Thread Only".
-// > generally thread safe, although operations on views such as creating,
-// > resizing, and moving should happen on the main thread.
-// <https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/CocoaFundamentals/AddingBehaviortoaCocoaProgram/AddingBehaviorCocoa.html#//apple_ref/doc/uid/TP40002974-CH5-SW47>
-//
-// > If you want to use a thread to draw to a view, bracket all drawing code
-// > between the lockFocusIfCanDraw and unlockFocus methods of NSView.
-// <https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/Multithreading/ThreadSafetySummary/ThreadSafetySummary.html#//apple_ref/doc/uid/10000057i-CH12-123351-BBCFIIEB>
-
-extern_methods!(
-    /// Getter methods
-    unsafe impl NSView {
-        #[method(frame)]
-        pub fn frame(&self) -> NSRect;
-
-        #[method(bounds)]
-        pub fn bounds(&self) -> NSRect;
-
-        #[method_id(inputContext)]
-        pub fn inputContext(
-            &self,
-            // _mtm: MainThreadMarker,
-        ) -> Option<Id<NSTextInputContext>>;
-
-        #[method(hasMarkedText)]
-        pub fn hasMarkedText(&self) -> bool;
-
-        #[method(convertPoint:fromView:)]
-        pub fn convertPoint_fromView(&self, point: NSPoint, view: Option<&NSView>) -> NSPoint;
-
-        #[method_id(window)]
-        pub fn window(&self) -> Option<Id<NSWindow>>;
-    }
-
-    unsafe impl NSView {
-        #[method(setWantsBestResolutionOpenGLSurface:)]
-        pub fn setWantsBestResolutionOpenGLSurface(&self, value: bool);
-
-        #[method(setWantsLayer:)]
-        pub fn setWantsLayer(&self, wants_layer: bool);
-
-        #[method(setPostsFrameChangedNotifications:)]
-        pub fn setPostsFrameChangedNotifications(&self, value: bool);
-
-        #[method(removeTrackingRect:)]
-        pub fn removeTrackingRect(&self, tag: NSTrackingRectTag);
-
-        #[method(addTrackingRect:owner:userData:assumeInside:)]
-        unsafe fn inner_addTrackingRect(
-            &self,
-            rect: NSRect,
-            owner: &AnyObject,
-            user_data: *mut c_void,
-            assume_inside: bool,
-        ) -> Option<NSTrackingRectTag>;
-
-        pub fn add_tracking_rect(&self, rect: NSRect, assume_inside: bool) -> NSTrackingRectTag {
-            // SAFETY: The user data is NULL, so it is valid
-            unsafe { self.inner_addTrackingRect(rect, self, ptr::null_mut(), assume_inside) }
-                .expect("failed creating tracking rect")
-        }
-
-        #[method(addCursorRect:cursor:)]
-        // NSCursor safe to take by shared reference since it is already immutable
-        pub fn addCursorRect(&self, rect: NSRect, cursor: &NSCursor);
-
-        #[method(setHidden:)]
-        pub fn setHidden(&self, hidden: bool);
-    }
-);
-
-/// <https://developer.apple.com/documentation/appkit/nstrackingrecttag?language=objc>
-pub type NSTrackingRectTag = NonZeroIsize; // NSInteger, but non-zero!

src/platform_impl/macos/appkit/window.rs

@@ -1,440 +0,0 @@
-use icrate::Foundation::{
-    CGFloat, NSArray, NSInteger, NSObject, NSPoint, NSRect, NSSize, NSString, NSUInteger,
-};
-use objc2::encode::{Encode, Encoding};
-use objc2::rc::Id;
-use objc2::runtime::AnyObject;
-use objc2::{extern_class, extern_methods, mutability, ClassType};
-
-use super::{
-    NSButton, NSColor, NSEvent, NSPasteboardType, NSResponder, NSScreen, NSView, NSWindowTabGroup,
-};
-
-extern_class!(
-    /// Main-Thread-Only!
-    #[derive(Debug, PartialEq, Eq, Hash)]
-    pub struct NSWindow;
-
-    unsafe impl ClassType for NSWindow {
-        #[inherits(NSObject)]
-        type Super = NSResponder;
-        type Mutability = mutability::InteriorMutable;
-    }
-);
-
-// Documented as "Main Thread Only", but:
-// > Thread safe in that you can create and manage them on a secondary thread.
-// <https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/CocoaFundamentals/AddingBehaviortoaCocoaProgram/AddingBehaviorCocoa.html#//apple_ref/doc/uid/TP40002974-CH5-SW47>
-// <https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/Multithreading/ThreadSafetySummary/ThreadSafetySummary.html#//apple_ref/doc/uid/10000057i-CH12-123364>
-//
-// So could in theory be `Send`, and perhaps also `Sync` - but we would like
-// interior mutability on windows, since that's just much easier, and in that
-// case, they can't be!
-
-extern_methods!(
-    unsafe impl NSWindow {
-        #[method(frame)]
-        pub(crate) fn frame(&self) -> NSRect;
-
-        #[method(windowNumber)]
-        pub(crate) fn windowNumber(&self) -> NSInteger;
-
-        #[method(backingScaleFactor)]
-        pub(crate) fn backingScaleFactor(&self) -> CGFloat;
-
-        #[method_id(contentView)]
-        pub(crate) fn contentView(&self) -> Id<NSView>;
-
-        #[method(setContentView:)]
-        pub(crate) fn setContentView(&self, view: &NSView);
-
-        #[method(setInitialFirstResponder:)]
-        pub(crate) fn setInitialFirstResponder(&self, view: &NSView);
-
-        #[method(makeFirstResponder:)]
-        #[must_use]
-        pub(crate) fn makeFirstResponder(&self, responder: Option<&NSResponder>) -> bool;
-
-        #[method(contentRectForFrameRect:)]
-        pub(crate) fn contentRectForFrameRect(&self, windowFrame: NSRect) -> NSRect;
-
-        #[method_id(screen)]
-        pub(crate) fn screen(&self) -> Option<Id<NSScreen>>;
-
-        #[method(setContentSize:)]
-        pub(crate) fn setContentSize(&self, contentSize: NSSize);
-
-        #[method(setFrameTopLeftPoint:)]
-        pub(crate) fn setFrameTopLeftPoint(&self, point: NSPoint);
-
-        #[method(setMinSize:)]
-        pub(crate) fn setMinSize(&self, minSize: NSSize);
-
-        #[method(setMaxSize:)]
-        pub(crate) fn setMaxSize(&self, maxSize: NSSize);
-
-        #[method(setResizeIncrements:)]
-        pub(crate) fn setResizeIncrements(&self, increments: NSSize);
-
-        #[method(contentResizeIncrements)]
-        pub(crate) fn contentResizeIncrements(&self) -> NSSize;
-
-        #[method(setContentResizeIncrements:)]
-        pub(crate) fn setContentResizeIncrements(&self, increments: NSSize);
-
-        #[method(setFrame:display:)]
-        pub(crate) fn setFrame_display(&self, frameRect: NSRect, flag: bool);
-
-        #[method(setMovable:)]
-        pub(crate) fn setMovable(&self, movable: bool);
-
-        #[method(setSharingType:)]
-        pub(crate) fn setSharingType(&self, sharingType: NSWindowSharingType);
-
-        #[method(setTabbingMode:)]
-        pub(crate) fn setTabbingMode(&self, tabbingMode: NSWindowTabbingMode);
-
-        #[method(setOpaque:)]
-        pub(crate) fn setOpaque(&self, opaque: bool);
-
-        #[method(hasShadow)]
-        pub(crate) fn hasShadow(&self) -> bool;
-
-        #[method(setHasShadow:)]
-        pub(crate) fn setHasShadow(&self, has_shadow: bool);
-
-        #[method(setIgnoresMouseEvents:)]
-        pub(crate) fn setIgnoresMouseEvents(&self, ignores: bool);
-
-        #[method(setBackgroundColor:)]
-        pub(crate) fn setBackgroundColor(&self, color: &NSColor);
-
-        #[method(styleMask)]
-        pub(crate) fn styleMask(&self) -> NSWindowStyleMask;
-
-        #[method(setStyleMask:)]
-        pub(crate) fn setStyleMask(&self, mask: NSWindowStyleMask);
-
-        #[method(registerForDraggedTypes:)]
-        pub(crate) fn registerForDraggedTypes(&self, types: &NSArray<NSPasteboardType>);
-
-        #[method(makeKeyAndOrderFront:)]
-        pub(crate) fn makeKeyAndOrderFront(&self, sender: Option<&AnyObject>);
-
-        #[method(orderFront:)]
-        pub(crate) fn orderFront(&self, sender: Option<&AnyObject>);
-
-        #[method(miniaturize:)]
-        pub(crate) fn miniaturize(&self, sender: Option<&AnyObject>);
-
-        #[method(deminiaturize:)]
-        pub(crate) fn deminiaturize(&self, sender: Option<&AnyObject>);
-
-        #[method(toggleFullScreen:)]
-        pub(crate) fn toggleFullScreen(&self, sender: Option<&AnyObject>);
-
-        #[method(orderOut:)]
-        pub(crate) fn orderOut(&self, sender: Option<&AnyObject>);
-
-        #[method(zoom:)]
-        pub(crate) fn zoom(&self, sender: Option<&AnyObject>);
-
-        #[method(selectNextKeyView:)]
-        pub(crate) fn selectNextKeyView(&self, sender: Option<&AnyObject>);
-
-        #[method(selectPreviousKeyView:)]
-        pub(crate) fn selectPreviousKeyView(&self, sender: Option<&AnyObject>);
-
-        #[method_id(firstResponder)]
-        pub(crate) fn firstResponder(&self) -> Option<Id<NSResponder>>;
-
-        #[method_id(standardWindowButton:)]
-        pub(crate) fn standardWindowButton(&self, kind: NSWindowButton) -> Option<Id<NSButton>>;
-
-        #[method(setTitle:)]
-        pub(crate) fn setTitle(&self, title: &NSString);
-
-        #[method_id(title)]
-        pub(crate) fn title_(&self) -> Id<NSString>;
-
-        #[method(setReleasedWhenClosed:)]
-        pub(crate) fn setReleasedWhenClosed(&self, val: bool);
-
-        #[method(setAcceptsMouseMovedEvents:)]
-        pub(crate) fn setAcceptsMouseMovedEvents(&self, val: bool);
-
-        #[method(setTitlebarAppearsTransparent:)]
-        pub(crate) fn setTitlebarAppearsTransparent(&self, val: bool);
-
-        #[method(setTitleVisibility:)]
-        pub(crate) fn setTitleVisibility(&self, visibility: NSWindowTitleVisibility);
-
-        #[method(setMovableByWindowBackground:)]
-        pub(crate) fn setMovableByWindowBackground(&self, val: bool);
-
-        #[method(setLevel:)]
-        pub(crate) fn setLevel(&self, level: NSWindowLevel);
-
-        #[method(setAllowsAutomaticWindowTabbing:)]
-        pub(crate) fn setAllowsAutomaticWindowTabbing(val: bool);
-
-        #[method(setTabbingIdentifier:)]
-        pub(crate) fn setTabbingIdentifier(&self, identifier: &NSString);
-
-        #[method(setDocumentEdited:)]
-        pub(crate) fn setDocumentEdited(&self, val: bool);
-
-        #[method(occlusionState)]
-        pub(crate) fn occlusionState(&self) -> NSWindowOcclusionState;
-
-        #[method(center)]
-        pub(crate) fn center(&self);
-
-        #[method(isResizable)]
-        pub(crate) fn isResizable(&self) -> bool;
-
-        #[method(isMiniaturizable)]
-        pub(crate) fn isMiniaturizable(&self) -> bool;
-
-        #[method(hasCloseBox)]
-        pub(crate) fn hasCloseBox(&self) -> bool;
-
-        #[method(isMiniaturized)]
-        pub(crate) fn isMiniaturized(&self) -> bool;
-
-        #[method(isVisible)]
-        pub(crate) fn isVisible(&self) -> bool;
-
-        #[method(isKeyWindow)]
-        pub(crate) fn isKeyWindow(&self) -> bool;
-
-        #[method(isZoomed)]
-        pub(crate) fn isZoomed(&self) -> bool;
-
-        #[method(allowsAutomaticWindowTabbing)]
-        pub(crate) fn allowsAutomaticWindowTabbing() -> bool;
-
-        #[method(selectNextTab)]
-        pub(crate) fn selectNextTab(&self);
-
-        #[method_id(tabbingIdentifier)]
-        pub(crate) fn tabbingIdentifier(&self) -> Id<NSString>;
-
-        #[method_id(tabGroup)]
-        pub(crate) fn tabGroup(&self) -> Option<Id<NSWindowTabGroup>>;
-
-        #[method(isDocumentEdited)]
-        pub(crate) fn isDocumentEdited(&self) -> bool;
-
-        #[method(close)]
-        pub(crate) fn close(&self);
-
-        #[method(performWindowDragWithEvent:)]
-        // TODO: Can this actually accept NULL?
-        pub(crate) fn performWindowDragWithEvent(&self, event: Option<&NSEvent>);
-
-        #[method(invalidateCursorRectsForView:)]
-        pub(crate) fn invalidateCursorRectsForView(&self, view: &NSView);
-
-        #[method(setDelegate:)]
-        pub(crate) fn setDelegate(&self, delegate: Option<&NSObject>);
-
-        #[method(sendEvent:)]
-        pub(crate) unsafe fn sendEvent(&self, event: &NSEvent);
-
-        #[method(addChildWindow:ordered:)]
-        pub(crate) unsafe fn addChildWindow(&self, child: &NSWindow, ordered: NSWindowOrderingMode);
-    }
-);
-
-#[allow(dead_code)]
-#[repr(isize)] // NSInteger
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-pub enum NSWindowTitleVisibility {
-    #[doc(alias = "NSWindowTitleVisible")]
-    Visible = 0,
-    #[doc(alias = "NSWindowTitleHidden")]
-    Hidden = 1,
-}
-
-unsafe impl Encode for NSWindowTitleVisibility {
-    const ENCODING: Encoding = NSInteger::ENCODING;
-}
-
-#[allow(dead_code)]
-#[repr(usize)] // NSUInteger
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-pub enum NSWindowButton {
-    #[doc(alias = "NSWindowCloseButton")]
-    Close = 0,
-    #[doc(alias = "NSWindowMiniaturizeButton")]
-    Miniaturize = 1,
-    #[doc(alias = "NSWindowZoomButton")]
-    Zoom = 2,
-    #[doc(alias = "NSWindowToolbarButton")]
-    Toolbar = 3,
-    #[doc(alias = "NSWindowDocumentIconButton")]
-    DocumentIcon = 4,
-    #[doc(alias = "NSWindowDocumentVersionsButton")]
-    DocumentVersions = 6,
-    #[doc(alias = "NSWindowFullScreenButton")]
-    #[deprecated = "Deprecated since macOS 10.12"]
-    FullScreen = 7,
-}
-
-unsafe impl Encode for NSWindowButton {
-    const ENCODING: Encoding = NSUInteger::ENCODING;
-}
-
-// CGWindowLevel.h
-//
-// Note: There are two different things at play in this header:
-// `CGWindowLevel` and `CGWindowLevelKey`.
-//
-// It seems like there was a push towards using "key" values instead of the
-// raw window level values, and then you were supposed to use
-// `CGWindowLevelForKey` to get the actual level.
-//
-// But the values that `NSWindowLevel` has are compiled in, and as such has
-// to remain ABI compatible, so they're safe for us to hardcode as well.
-#[allow(dead_code)]
-mod window_level {
-    const kCGNumReservedWindowLevels: i32 = 16;
-    const kCGNumReservedBaseWindowLevels: i32 = 5;
-
-    pub const kCGBaseWindowLevel: i32 = i32::MIN;
-    pub const kCGMinimumWindowLevel: i32 = kCGBaseWindowLevel + kCGNumReservedBaseWindowLevels;
-    pub const kCGMaximumWindowLevel: i32 = i32::MAX - kCGNumReservedWindowLevels;
-
-    pub const kCGDesktopWindowLevel: i32 = kCGMinimumWindowLevel + 20;
-    pub const kCGDesktopIconWindowLevel: i32 = kCGDesktopWindowLevel + 20;
-    pub const kCGBackstopMenuLevel: i32 = -20;
-    pub const kCGNormalWindowLevel: i32 = 0;
-    pub const kCGFloatingWindowLevel: i32 = 3;
-    pub const kCGTornOffMenuWindowLevel: i32 = 3;
-    pub const kCGModalPanelWindowLevel: i32 = 8;
-    pub const kCGUtilityWindowLevel: i32 = 19;
-    pub const kCGDockWindowLevel: i32 = 20;
-    pub const kCGMainMenuWindowLevel: i32 = 24;
-    pub const kCGStatusWindowLevel: i32 = 25;
-    pub const kCGPopUpMenuWindowLevel: i32 = 101;
-    pub const kCGOverlayWindowLevel: i32 = 102;
-    pub const kCGHelpWindowLevel: i32 = 200;
-    pub const kCGDraggingWindowLevel: i32 = 500;
-    pub const kCGScreenSaverWindowLevel: i32 = 1000;
-    pub const kCGAssistiveTechHighWindowLevel: i32 = 1500;
-    pub const kCGCursorWindowLevel: i32 = kCGMaximumWindowLevel - 1;
-}
-use window_level::*;
-
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-#[repr(transparent)]
-pub struct NSWindowLevel(pub NSInteger);
-
-#[allow(dead_code)]
-impl NSWindowLevel {
-    #[doc(alias = "BelowNormalWindowLevel")]
-    pub const BELOW_NORMAL: Self = Self((kCGNormalWindowLevel - 1) as _);
-    #[doc(alias = "NSNormalWindowLevel")]
-    pub const Normal: Self = Self(kCGNormalWindowLevel as _);
-    #[doc(alias = "NSFloatingWindowLevel")]
-    pub const Floating: Self = Self(kCGFloatingWindowLevel as _);
-    #[doc(alias = "NSTornOffMenuWindowLevel")]
-    pub const TornOffMenu: Self = Self(kCGTornOffMenuWindowLevel as _);
-    #[doc(alias = "NSModalPanelWindowLevel")]
-    pub const ModalPanel: Self = Self(kCGModalPanelWindowLevel as _);
-    #[doc(alias = "NSMainMenuWindowLevel")]
-    pub const MainMenu: Self = Self(kCGMainMenuWindowLevel as _);
-    #[doc(alias = "NSStatusWindowLevel")]
-    pub const Status: Self = Self(kCGStatusWindowLevel as _);
-    #[doc(alias = "NSPopUpMenuWindowLevel")]
-    pub const PopUpMenu: Self = Self(kCGPopUpMenuWindowLevel as _);
-    #[doc(alias = "NSScreenSaverWindowLevel")]
-    pub const ScreenSaver: Self = Self(kCGScreenSaverWindowLevel as _);
-}
-
-unsafe impl Encode for NSWindowLevel {
-    const ENCODING: Encoding = NSInteger::ENCODING;
-}
-
-bitflags! {
-    #[derive(Clone, Copy)]
-    pub struct NSWindowOcclusionState: NSUInteger {
-        const NSWindowOcclusionStateVisible = 1 << 1;
-    }
-}
-
-unsafe impl Encode for NSWindowOcclusionState {
-    const ENCODING: Encoding = NSUInteger::ENCODING;
-}
-
-bitflags! {
-    #[derive(Debug, Clone, Copy)]
-    pub struct NSWindowStyleMask: NSUInteger {
-        const NSBorderlessWindowMask      = 0;
-        const NSTitledWindowMask          = 1 << 0;
-        const NSClosableWindowMask        = 1 << 1;
-        const NSMiniaturizableWindowMask  = 1 << 2;
-        const NSResizableWindowMask       = 1 << 3;
-        const NSTexturedBackgroundWindowMask  = 1 << 8;
-        const NSUnifiedTitleAndToolbarWindowMask  = 1 << 12;
-        const NSFullScreenWindowMask      = 1 << 14;
-        const NSFullSizeContentViewWindowMask = 1 << 15;
-    }
-}
-
-unsafe impl Encode for NSWindowStyleMask {
-    const ENCODING: Encoding = NSUInteger::ENCODING;
-}
-
-#[allow(dead_code)]
-#[repr(usize)] // NSUInteger
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-pub enum NSBackingStoreType {
-    NSBackingStoreRetained = 0,
-    NSBackingStoreNonretained = 1,
-    NSBackingStoreBuffered = 2,
-}
-
-unsafe impl Encode for NSBackingStoreType {
-    const ENCODING: Encoding = NSUInteger::ENCODING;
-}
-
-#[allow(dead_code)]
-#[repr(usize)] // NSUInteger
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-pub enum NSWindowSharingType {
-    NSWindowSharingNone = 0,
-    NSWindowSharingReadOnly = 1,
-    NSWindowSharingReadWrite = 2,
-}
-
-unsafe impl Encode for NSWindowSharingType {
-    const ENCODING: Encoding = NSUInteger::ENCODING;
-}
-
-#[allow(dead_code)]
-#[repr(isize)] // NSInteger
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-pub enum NSWindowOrderingMode {
-    NSWindowAbove = 1,
-    NSWindowBelow = -1,
-    NSWindowOut = 0,
-}
-
-unsafe impl Encode for NSWindowOrderingMode {
-    const ENCODING: Encoding = NSInteger::ENCODING;
-}
-
-#[allow(dead_code)]
-#[repr(isize)] // NSInteger
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-pub enum NSWindowTabbingMode {
-    NSWindowTabbingModeAutomatic = 0,
-    NSWindowTabbingModeDisallowed = 2,
-    NSWindowTabbingModePreferred = 1,
-}
-
-unsafe impl Encode for NSWindowTabbingMode {
-    const ENCODING: Encoding = NSInteger::ENCODING;
-}

src/platform_impl/macos/cursor.rs

@@ -0,0 +1,228 @@
+use icrate::AppKit::{NSBitmapImageRep, NSCursor, NSDeviceRGBColorSpace, NSImage};
+use icrate::Foundation::{
+    ns_string, NSData, NSDictionary, NSNumber, NSObject, NSObjectProtocol, NSPoint, NSSize,
+    NSString,
+};
+use objc2::rc::Id;
+use objc2::runtime::Sel;
+use objc2::{msg_send_id, sel, ClassType};
+use once_cell::sync::Lazy;
+use std::ffi::c_uchar;
+use std::slice;
+
+use super::EventLoopWindowTarget;
+use crate::cursor::CursorImage;
+use crate::cursor::OnlyCursorImageBuilder;
+use crate::window::CursorIcon;
+
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+pub struct CustomCursor(pub(crate) Id<NSCursor>);
+
+// SAFETY: NSCursor is immutable and thread-safe
+// TODO(madsmtm): Put this logic in icrate itself
+unsafe impl Send for CustomCursor {}
+unsafe impl Sync for CustomCursor {}
+
+impl CustomCursor {
+    pub(crate) fn build<T>(
+        cursor: OnlyCursorImageBuilder,
+        _: &EventLoopWindowTarget<T>,
+    ) -> CustomCursor {
+        Self(cursor_from_image(&cursor.0))
+    }
+}
+
+pub(crate) fn cursor_from_image(cursor: &CursorImage) -> Id<NSCursor> {
+    let width = cursor.width;
+    let height = cursor.height;
+
+    let bitmap = unsafe {
+        NSBitmapImageRep::initWithBitmapDataPlanes_pixelsWide_pixelsHigh_bitsPerSample_samplesPerPixel_hasAlpha_isPlanar_colorSpaceName_bytesPerRow_bitsPerPixel(
+            NSBitmapImageRep::alloc(),
+            std::ptr::null_mut::<*mut c_uchar>(),
+            width as isize,
+            height as isize,
+            8,
+            4,
+            true,
+            false,
+            NSDeviceRGBColorSpace,
+            width as isize * 4,
+            32,
+        ).unwrap()
+    };
+    let bitmap_data = unsafe { slice::from_raw_parts_mut(bitmap.bitmapData(), cursor.rgba.len()) };
+    bitmap_data.copy_from_slice(&cursor.rgba);
+
+    let image = unsafe {
+        NSImage::initWithSize(NSImage::alloc(), NSSize::new(width.into(), height.into()))
+    };
+    unsafe { image.addRepresentation(&bitmap) };
+
+    let hotspot = NSPoint::new(cursor.hotspot_x as f64, cursor.hotspot_y as f64);
+
+    NSCursor::initWithImage_hotSpot(NSCursor::alloc(), &image, hotspot)
+}
+
+pub(crate) fn default_cursor() -> Id<NSCursor> {
+    NSCursor::arrowCursor()
+}
+
+unsafe fn try_cursor_from_selector(sel: Sel) -> Option<Id<NSCursor>> {
+    let cls = NSCursor::class();
+    if cls.responds_to(sel) {
+        let cursor: Id<NSCursor> = unsafe { msg_send_id![cls, performSelector: sel] };
+        Some(cursor)
+    } else {
+        warn!("cursor `{sel}` appears to be invalid");
+        None
+    }
+}
+
+macro_rules! def_undocumented_cursor {
+    {$(
+        $(#[$($m:meta)*])*
+        fn $name:ident();
+    )*} => {$(
+        $(#[$($m)*])*
+        #[allow(non_snake_case)]
+        fn $name() -> Id<NSCursor> {
+            unsafe { try_cursor_from_selector(sel!($name)).unwrap_or_else(|| default_cursor()) }
+        }
+    )*};
+}
+
+def_undocumented_cursor!(
+    // Undocumented cursors: https://stackoverflow.com/a/46635398/5435443
+    fn _helpCursor();
+    fn _zoomInCursor();
+    fn _zoomOutCursor();
+    fn _windowResizeNorthEastCursor();
+    fn _windowResizeNorthWestCursor();
+    fn _windowResizeSouthEastCursor();
+    fn _windowResizeSouthWestCursor();
+    fn _windowResizeNorthEastSouthWestCursor();
+    fn _windowResizeNorthWestSouthEastCursor();
+
+    // While these two are available, the former just loads a white arrow,
+    // and the latter loads an ugly deflated beachball!
+    // pub fn _moveCursor();
+    // pub fn _waitCursor();
+
+    // An even more undocumented cursor...
+    // https://bugs.eclipse.org/bugs/show_bug.cgi?id=522349
+    fn busyButClickableCursor();
+);
+
+// Note that loading `busybutclickable` with this code won't animate
+// the frames; instead you'll just get them all in a column.
+unsafe fn load_webkit_cursor(name: &NSString) -> Id<NSCursor> {
+    // Snatch a cursor from WebKit; They fit the style of the native
+    // cursors, and will seem completely standard to macOS users.
+    //
+    // https://stackoverflow.com/a/21786835/5435443
+    let root = ns_string!("/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/Resources/cursors");
+    let cursor_path = root.stringByAppendingPathComponent(name);
+
+    let pdf_path = cursor_path.stringByAppendingPathComponent(ns_string!("cursor.pdf"));
+    let image = NSImage::initByReferencingFile(NSImage::alloc(), &pdf_path).unwrap();
+
+    // TODO: Handle PLists better
+    let info_path = cursor_path.stringByAppendingPathComponent(ns_string!("info.plist"));
+    let info: Id<NSDictionary<NSObject, NSObject>> = unsafe {
+        msg_send_id![
+            <NSDictionary<NSObject, NSObject>>::class(),
+            dictionaryWithContentsOfFile: &*info_path,
+        ]
+    };
+    let mut x = 0.0;
+    if let Some(n) = info.get(&*ns_string!("hotx")) {
+        if n.is_kind_of::<NSNumber>() {
+            let ptr: *const NSObject = n;
+            let ptr: *const NSNumber = ptr.cast();
+            x = unsafe { &*ptr }.as_cgfloat()
+        }
+    }
+    let mut y = 0.0;
+    if let Some(n) = info.get(&*ns_string!("hotx")) {
+        if n.is_kind_of::<NSNumber>() {
+            let ptr: *const NSObject = n;
+            let ptr: *const NSNumber = ptr.cast();
+            y = unsafe { &*ptr }.as_cgfloat()
+        }
+    }
+
+    let hotspot = NSPoint::new(x, y);
+    NSCursor::initWithImage_hotSpot(NSCursor::alloc(), &image, hotspot)
+}
+
+fn webkit_move() -> Id<NSCursor> {
+    unsafe { load_webkit_cursor(ns_string!("move")) }
+}
+
+fn webkit_cell() -> Id<NSCursor> {
+    unsafe { load_webkit_cursor(ns_string!("cell")) }
+}
+
+pub(crate) fn invisible_cursor() -> Id<NSCursor> {
+    // 16x16 GIF data for invisible cursor
+    // You can reproduce this via ImageMagick.
+    // $ convert -size 16x16 xc:none cursor.gif
+    static CURSOR_BYTES: &[u8] = &[
+        0x47, 0x49, 0x46, 0x38, 0x39, 0x61, 0x10, 0x00, 0x10, 0x00, 0xF0, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x21, 0xF9, 0x04, 0x01, 0x00, 0x00, 0x00, 0x00, 0x2C, 0x00, 0x00,
+        0x00, 0x00, 0x10, 0x00, 0x10, 0x00, 0x00, 0x02, 0x0E, 0x84, 0x8F, 0xA9, 0xCB, 0xED, 0x0F,
+        0xA3, 0x9C, 0xB4, 0xDA, 0x8B, 0xB3, 0x3E, 0x05, 0x00, 0x3B,
+    ];
+
+    static CURSOR: Lazy<CustomCursor> = Lazy::new(|| {
+        // TODO: Consider using `dataWithBytesNoCopy:`
+        let data = NSData::with_bytes(CURSOR_BYTES);
+        let image = NSImage::initWithData(NSImage::alloc(), &data).unwrap();
+        let hotspot = NSPoint::new(0.0, 0.0);
+        CustomCursor(NSCursor::initWithImage_hotSpot(
+            NSCursor::alloc(),
+            &image,
+            hotspot,
+        ))
+    });
+
+    CURSOR.0.clone()
+}
+
+pub(crate) fn cursor_from_icon(icon: CursorIcon) -> Id<NSCursor> {
+    match icon {
+        CursorIcon::Default => default_cursor(),
+        CursorIcon::Pointer => NSCursor::pointingHandCursor(),
+        CursorIcon::Grab => NSCursor::openHandCursor(),
+        CursorIcon::Grabbing => NSCursor::closedHandCursor(),
+        CursorIcon::Text => NSCursor::IBeamCursor(),
+        CursorIcon::VerticalText => NSCursor::IBeamCursorForVerticalLayout(),
+        CursorIcon::Copy => NSCursor::dragCopyCursor(),
+        CursorIcon::Alias => NSCursor::dragLinkCursor(),
+        CursorIcon::NotAllowed | CursorIcon::NoDrop => NSCursor::operationNotAllowedCursor(),
+        CursorIcon::ContextMenu => NSCursor::contextualMenuCursor(),
+        CursorIcon::Crosshair => NSCursor::crosshairCursor(),
+        CursorIcon::EResize => NSCursor::resizeRightCursor(),
+        CursorIcon::NResize => NSCursor::resizeUpCursor(),
+        CursorIcon::WResize => NSCursor::resizeLeftCursor(),
+        CursorIcon::SResize => NSCursor::resizeDownCursor(),
+        CursorIcon::EwResize | CursorIcon::ColResize => NSCursor::resizeLeftRightCursor(),
+        CursorIcon::NsResize | CursorIcon::RowResize => NSCursor::resizeUpDownCursor(),
+        CursorIcon::Help => _helpCursor(),
+        CursorIcon::ZoomIn => _zoomInCursor(),
+        CursorIcon::ZoomOut => _zoomOutCursor(),
+        CursorIcon::NeResize => _windowResizeNorthEastCursor(),
+        CursorIcon::NwResize => _windowResizeNorthWestCursor(),
+        CursorIcon::SeResize => _windowResizeSouthEastCursor(),
+        CursorIcon::SwResize => _windowResizeSouthWestCursor(),
+        CursorIcon::NeswResize => _windowResizeNorthEastSouthWestCursor(),
+        CursorIcon::NwseResize => _windowResizeNorthWestSouthEastCursor(),
+        // This is the wrong semantics for `Wait`, but it's the same as
+        // what's used in Safari and Chrome.
+        CursorIcon::Wait | CursorIcon::Progress => busyButClickableCursor(),
+        CursorIcon::Move | CursorIcon::AllScroll => webkit_move(),
+        CursorIcon::Cell => webkit_cell(),
+        _ => default_cursor(),
+    }
+}

src/platform_impl/macos/event.rs

@@ -4,10 +4,15 @@ use core_foundation::{
     base::CFRelease,
     data::{CFDataGetBytePtr, CFDataRef},
 };
-use icrate::Foundation::MainThreadMarker;
+use icrate::AppKit::{
+    NSEvent, NSEventModifierFlagCommand, NSEventModifierFlagControl, NSEventModifierFlagOption,
+    NSEventModifierFlagShift, NSEventModifierFlags, NSEventSubtypeWindowExposed,
+    NSEventTypeApplicationDefined,
+};
+use icrate::Foundation::{MainThreadMarker, NSPoint};
+use objc2::rc::Id;
 use smol_str::SmolStr;
 
-use super::appkit::{NSEvent, NSEventModifierFlags};
 use crate::{
     event::{ElementState, KeyEvent, Modifiers},
     keyboard::{
@@ -39,7 +44,6 @@ impl KeyEventExtModifierSupplement for KeyEvent {
     }
 }
 
-/// Ignores ALL modifiers.
 pub fn get_modifierless_char(scancode: u16) -> Key {
     let mut string = [0; 16];
     let input_source;
@@ -98,10 +102,8 @@ pub fn get_modifierless_char(scancode: u16) -> Key {
     Key::Character(SmolStr::new(chars))
 }
 
-// Ignores all modifiers except for SHIFT (yes, even ALT is ignored).
 fn get_logical_key_char(ns_event: &NSEvent, modifierless_chars: &str) -> Key {
-    let string = ns_event
-        .charactersIgnoringModifiers()
+    let string = unsafe { ns_event.charactersIgnoringModifiers() }
         .map(|s| s.to_string())
         .unwrap_or_default();
     if string.is_empty() {
@@ -124,22 +126,14 @@ pub(crate) fn create_key_event(
     use ElementState::{Pressed, Released};
     let state = if is_press { Pressed } else { Released };
 
-    let scancode = ns_event.key_code();
+    let scancode = unsafe { ns_event.keyCode() };
     let mut physical_key =
         key_override.unwrap_or_else(|| PhysicalKey::from_scancode(scancode as u32));
 
-    // NOTE: The logical key should heed both SHIFT and ALT if possible.
-    // For instance:
-    // * Pressing the A key: logical key should be "a"
-    // * Pressing SHIFT A: logical key should be "A"
-    // * Pressing CTRL SHIFT A: logical key should also be "A"
-    // This is not easy to tease out of `NSEvent`, but we do our best.
-
     let text_with_all_modifiers: Option<SmolStr> = if key_override.is_some() {
         None
     } else {
-        let characters = ns_event
-            .characters()
+        let characters = unsafe { ns_event.characters() }
             .map(|s| s.to_string())
             .unwrap_or_default();
         if characters.is_empty() {
@@ -155,29 +149,21 @@ pub(crate) fn create_key_event(
 
     let key_from_code = code_to_key(physical_key, scancode);
     let (logical_key, key_without_modifiers) = if matches!(key_from_code, Key::Unidentified(_)) {
-        // `get_modifierless_char/key_without_modifiers` ignores ALL modifiers.
         let key_without_modifiers = get_modifierless_char(scancode);
 
-        let modifiers = NSEvent::modifierFlags(ns_event);
-        let has_ctrl = modifiers.contains(NSEventModifierFlags::NSControlKeyMask);
-        let has_cmd = modifiers.contains(NSEventModifierFlags::NSCommandKeyMask);
+        let modifiers = unsafe { ns_event.modifierFlags() };
+        let has_ctrl = flags_contains(modifiers, NSEventModifierFlagControl);
 
         let logical_key = match text_with_all_modifiers.as_ref() {
-            // Only checking for ctrl and cmd here, not checking for alt because we DO want to
+            // Only checking for ctrl here, not checking for alt because we DO want to
             // include its effect in the key. For example if -on the Germay layout- one
             // presses alt+8, the logical key should be "{"
             // Also not checking if this is a release event because then this issue would
             // still affect the key release.
-            Some(text) if !has_ctrl && !has_cmd => {
-                // Character heeding both SHIFT and ALT.
-                Key::Character(text.clone())
-            }
-
+            Some(text) if !has_ctrl => Key::Character(text.clone()),
             _ => match key_without_modifiers.as_ref() {
-                // Character heeding just SHIFT, ignoring ALT.
                 Key::Character(ch) => get_logical_key_char(ns_event, ch),
-
-                // Character ignoring ALL modifiers.
+                // Don't try to get text for events which likely don't have it.
                 _ => key_without_modifiers.clone(),
             },
         };
@@ -328,42 +314,84 @@ pub fn extra_function_key_to_code(scancode: u16, string: &str) -> PhysicalKey {
     }
 }
 
+// The values are from the https://github.com/apple-oss-distributions/IOHIDFamily/blob/19666c840a6d896468416ff0007040a10b7b46b8/IOHIDSystem/IOKit/hidsystem/IOLLEvent.h#L258-L259
+const NX_DEVICELCTLKEYMASK: NSEventModifierFlags = 0x00000001;
+const NX_DEVICELSHIFTKEYMASK: NSEventModifierFlags = 0x00000002;
+const NX_DEVICERSHIFTKEYMASK: NSEventModifierFlags = 0x00000004;
+const NX_DEVICELCMDKEYMASK: NSEventModifierFlags = 0x00000008;
+const NX_DEVICERCMDKEYMASK: NSEventModifierFlags = 0x00000010;
+const NX_DEVICELALTKEYMASK: NSEventModifierFlags = 0x00000020;
+const NX_DEVICERALTKEYMASK: NSEventModifierFlags = 0x00000040;
+const NX_DEVICERCTLKEYMASK: NSEventModifierFlags = 0x00002000;
+
+pub(super) fn flags_contains(flags: NSEventModifierFlags, value: NSEventModifierFlags) -> bool {
+    flags & value == value
+}
+
+pub(super) fn lalt_pressed(event: &NSEvent) -> bool {
+    flags_contains(unsafe { event.modifierFlags() }, NX_DEVICELALTKEYMASK)
+}
+
+pub(super) fn ralt_pressed(event: &NSEvent) -> bool {
+    flags_contains(unsafe { event.modifierFlags() }, NX_DEVICERALTKEYMASK)
+}
+
 pub(super) fn event_mods(event: &NSEvent) -> Modifiers {
-    let flags = event.modifierFlags();
+    let flags = unsafe { event.modifierFlags() };
     let mut state = ModifiersState::empty();
     let mut pressed_mods = ModifiersKeys::empty();
 
     state.set(
         ModifiersState::SHIFT,
-        flags.contains(NSEventModifierFlags::NSShiftKeyMask),
+        flags_contains(flags, NSEventModifierFlagShift),
+    );
+    pressed_mods.set(
+        ModifiersKeys::LSHIFT,
+        flags_contains(flags, NX_DEVICELSHIFTKEYMASK),
+    );
+    pressed_mods.set(
+        ModifiersKeys::RSHIFT,
+        flags_contains(flags, NX_DEVICERSHIFTKEYMASK),
     );
-
-    pressed_mods.set(ModifiersKeys::LSHIFT, event.lshift_pressed());
-    pressed_mods.set(ModifiersKeys::RSHIFT, event.rshift_pressed());
 
     state.set(
         ModifiersState::CONTROL,
-        flags.contains(NSEventModifierFlags::NSControlKeyMask),
+        flags_contains(flags, NSEventModifierFlagControl),
+    );
+    pressed_mods.set(
+        ModifiersKeys::LCONTROL,
+        flags_contains(flags, NX_DEVICELCTLKEYMASK),
+    );
+    pressed_mods.set(
+        ModifiersKeys::RCONTROL,
+        flags_contains(flags, NX_DEVICERCTLKEYMASK),
     );
-
-    pressed_mods.set(ModifiersKeys::LCONTROL, event.lctrl_pressed());
-    pressed_mods.set(ModifiersKeys::RCONTROL, event.rctrl_pressed());
 
     state.set(
         ModifiersState::ALT,
-        flags.contains(NSEventModifierFlags::NSAlternateKeyMask),
+        flags_contains(flags, NSEventModifierFlagOption),
+    );
+    pressed_mods.set(
+        ModifiersKeys::LALT,
+        flags_contains(flags, NX_DEVICELALTKEYMASK),
+    );
+    pressed_mods.set(
+        ModifiersKeys::RALT,
+        flags_contains(flags, NX_DEVICERALTKEYMASK),
     );
-
-    pressed_mods.set(ModifiersKeys::LALT, event.lalt_pressed());
-    pressed_mods.set(ModifiersKeys::RALT, event.ralt_pressed());
 
     state.set(
         ModifiersState::SUPER,
-        flags.contains(NSEventModifierFlags::NSCommandKeyMask),
+        flags_contains(flags, NSEventModifierFlagCommand),
+    );
+    pressed_mods.set(
+        ModifiersKeys::LSUPER,
+        flags_contains(flags, NX_DEVICELCMDKEYMASK),
+    );
+    pressed_mods.set(
+        ModifiersKeys::RSUPER,
+        flags_contains(flags, NX_DEVICERCMDKEYMASK),
     );
-
-    pressed_mods.set(ModifiersKeys::LSUPER, event.lcmd_pressed());
-    pressed_mods.set(ModifiersKeys::RSUPER, event.rcmd_pressed());
 
     Modifiers {
         state,
@@ -371,6 +399,22 @@ pub(super) fn event_mods(event: &NSEvent) -> Modifiers {
     }
 }
 
+pub(super) fn dummy_event() -> Option<Id<NSEvent>> {
+    unsafe {
+        NSEvent::otherEventWithType_location_modifierFlags_timestamp_windowNumber_context_subtype_data1_data2(
+            NSEventTypeApplicationDefined,
+            NSPoint::new(0.0, 0.0),
+            0, // Empty NSEventModifierFlags
+            0.0,
+            0,
+            None,
+            NSEventSubtypeWindowExposed,
+            0,
+            0,
+        )
+    }
+}
+
 impl PhysicalKeyExtScancode for PhysicalKey {
     fn to_scancode(self) -> Option<u32> {
         let code = match self {

src/platform_impl/macos/event_loop.rs

@@ -17,12 +17,18 @@ use core_foundation::runloop::{
     kCFRunLoopCommonModes, CFRunLoopAddSource, CFRunLoopGetMain, CFRunLoopSourceContext,
     CFRunLoopSourceCreate, CFRunLoopSourceRef, CFRunLoopSourceSignal, CFRunLoopWakeUp,
 };
-use icrate::Foundation::MainThreadMarker;
-use objc2::rc::{autoreleasepool, Id};
-use objc2::runtime::NSObjectProtocol;
+use icrate::AppKit::{
+    NSApplication, NSApplicationActivationPolicyAccessory, NSApplicationActivationPolicyProhibited,
+    NSApplicationActivationPolicyRegular, NSWindow,
+};
+use icrate::Foundation::{MainThreadMarker, NSObjectProtocol};
 use objc2::{msg_send_id, ClassType};
+use objc2::{
+    rc::{autoreleasepool, Id},
+    runtime::ProtocolObject,
+};
 
-use super::appkit::{NSApp, NSApplication, NSApplicationActivationPolicy, NSEvent, NSWindow};
+use super::event::dummy_event;
 use crate::{
     error::EventLoopError,
     event::Event,
@@ -116,10 +122,6 @@ impl<T: 'static> EventLoopWindowTarget<T> {
         AppState::exit()
     }
 
-    pub(crate) fn clear_exit(&self) {
-        AppState::clear_exit()
-    }
-
     pub(crate) fn exiting(&self) -> bool {
         AppState::exiting()
     }
@@ -127,19 +129,19 @@ impl<T: 'static> EventLoopWindowTarget<T> {
 
 impl<T> EventLoopWindowTarget<T> {
     pub(crate) fn hide_application(&self) {
-        NSApplication::shared(self.mtm).hide(None)
+        NSApplication::sharedApplication(self.mtm).hide(None)
     }
 
     pub(crate) fn hide_other_applications(&self) {
-        NSApplication::shared(self.mtm).hideOtherApplications(None)
+        NSApplication::sharedApplication(self.mtm).hideOtherApplications(None)
     }
 
     pub(crate) fn set_allows_automatic_window_tabbing(&self, enabled: bool) {
-        NSWindow::setAllowsAutomaticWindowTabbing(enabled)
+        NSWindow::setAllowsAutomaticWindowTabbing(enabled, self.mtm)
     }
 
     pub(crate) fn allows_automatic_window_tabbing(&self) -> bool {
-        NSWindow::allowsAutomaticWindowTabbing()
+        NSWindow::allowsAutomaticWindowTabbing(self.mtm)
     }
 }
 
@@ -200,20 +202,20 @@ impl<T> EventLoop<T> {
             panic!("`winit` requires control over the principal class. You must create the event loop before other parts of your application initialize NSApplication");
         }
 
-        use NSApplicationActivationPolicy::*;
         let activation_policy = match attributes.activation_policy {
             ActivationPolicy::Regular => NSApplicationActivationPolicyRegular,
             ActivationPolicy::Accessory => NSApplicationActivationPolicyAccessory,
             ActivationPolicy::Prohibited => NSApplicationActivationPolicyProhibited,
         };
         let delegate = ApplicationDelegate::new(
+            mtm,
             activation_policy,
             attributes.default_menu,
             attributes.activate_ignoring_other_apps,
         );
 
         autoreleasepool(|_| {
-            app.setDelegate(&delegate);
+            app.setDelegate(Some(ProtocolObject::from_ref(&*delegate)));
         });
 
         let panic_info: Rc<PanicInfo> = Default::default();
@@ -311,7 +313,7 @@ impl<T> EventLoop<T> {
 
                 // While the app is running it's possible that we catch a panic
                 // to avoid unwinding across an objective-c ffi boundary, which
-                // will lead to us stopping the `NSApp` and saving the
+                // will lead to us stopping the `NSApplication` and saving the
                 // `PanicInfo` so that we can resume the unwind at a controlled,
                 // safe point in time.
                 if let Some(panic) = self.panic_info.take() {
@@ -359,8 +361,6 @@ impl<T> EventLoop<T> {
         self._callback = Some(Rc::clone(&callback));
 
         autoreleasepool(|_| {
-            let app = NSApp();
-
             // A bit of juggling with the callback references to make sure
             // that `self.callback` is the only owner of the callback.
             let weak_cb: Weak<_> = Rc::downgrade(&callback);
@@ -381,25 +381,24 @@ impl<T> EventLoop<T> {
             // catch panics to make sure we can't unwind without clearing the set callback
             // (which would leave the global `AppState` in an undefined, unsafe state)
             let catch_result = catch_unwind(AssertUnwindSafe(|| {
-                // As a special case, if the `NSApp` hasn't been launched yet then we at least run
+                // As a special case, if the application hasn't been launched yet then we at least run
                 // the loop until it has fully launched.
                 if !AppState::is_launched() {
                     debug_assert!(!AppState::is_running());
 
                     AppState::request_stop_on_launch();
                     unsafe {
-                        app.run();
+                        self.app.run();
                     }
 
-                    // Note: we dispatch `NewEvents(Init)` + `Resumed` events after the `NSApp` has launched
+                    // Note: we dispatch `NewEvents(Init)` + `Resumed` events after the application has launched
                 } else if !AppState::is_running() {
-                    // Even though the NSApp may have been launched, it's possible we aren't running
+                    // Even though the application may have been launched, it's possible we aren't running
                     // if the `EventLoop` was run before and has since exited. This indicates that
                     // we just starting to re-run the same `EventLoop` again.
                     AppState::start_running(); // Set is_running = true + dispatch `NewEvents(Init)` + `Resumed`
                 } else {
-                    // Only run the NSApp for as long as the given `Duration` allows so we
-                    // don't block the external loop.
+                    // Only run for as long as the given `Duration` allows so we don't block the external loop.
                     match timeout {
                         Some(Duration::ZERO) => {
                             AppState::set_wait_timeout(None);
@@ -419,13 +418,13 @@ impl<T> EventLoop<T> {
                     }
                     AppState::set_stop_app_on_redraw_requested(true);
                     unsafe {
-                        app.run();
+                        self.app.run();
                     }
                 }
 
                 // While the app is running it's possible that we catch a panic
                 // to avoid unwinding across an objective-c ffi boundary, which
-                // will lead to us stopping the `NSApp` and saving the
+                // will lead to us stopping the application and saving the
                 // `PanicInfo` so that we can resume the unwind at a controlled,
                 // safe point in time.
                 if let Some(panic) = self.panic_info.take() {
@@ -463,6 +462,7 @@ impl<T> EventLoop<T> {
 /// happens, stops the `sharedApplication`
 #[inline]
 pub fn stop_app_on_panic<F: FnOnce() -> R + UnwindSafe, R>(
+    mtm: MainThreadMarker,
     panic_info: Weak<PanicInfo>,
     f: F,
 ) -> Option<R> {
@@ -477,11 +477,11 @@ pub fn stop_app_on_panic<F: FnOnce() -> R + UnwindSafe, R>(
                 let panic_info = panic_info.upgrade().unwrap();
                 panic_info.set_panic(e);
             }
-            let app = NSApp();
+            let app = NSApplication::sharedApplication(mtm);
             app.stop(None);
             // Posting a dummy event to get `stop` to take effect immediately.
             // See: https://stackoverflow.com/questions/48041279/stopping-the-nsapplication-main-event-loop/48064752#48064752
-            app.postEvent_atStart(&NSEvent::dummy(), true);
+            app.postEvent_atStart(&dummy_event().unwrap(), true);
             None
         }
     }

src/platform_impl/macos/ffi.rs

@@ -210,3 +210,45 @@ extern "C" {
         unicodeString: *mut UniChar,
     ) -> OSStatus;
 }
+
+// CGWindowLevel.h
+//
+// Note: There are two different things at play in this header:
+// `CGWindowLevel` and `CGWindowLevelKey`.
+//
+// It seems like there was a push towards using "key" values instead of the
+// raw window level values, and then you were supposed to use
+// `CGWindowLevelForKey` to get the actual level.
+//
+// But the values that `NSWindowLevel` has are compiled in, and as such has
+// to remain ABI compatible, so they're safe for us to hardcode as well.
+#[allow(dead_code, non_upper_case_globals)]
+mod window_level {
+    const kCGNumReservedWindowLevels: i32 = 16;
+    const kCGNumReservedBaseWindowLevels: i32 = 5;
+
+    pub const kCGBaseWindowLevel: i32 = i32::MIN;
+    pub const kCGMinimumWindowLevel: i32 = kCGBaseWindowLevel + kCGNumReservedBaseWindowLevels;
+    pub const kCGMaximumWindowLevel: i32 = i32::MAX - kCGNumReservedWindowLevels;
+
+    pub const kCGDesktopWindowLevel: i32 = kCGMinimumWindowLevel + 20;
+    pub const kCGDesktopIconWindowLevel: i32 = kCGDesktopWindowLevel + 20;
+    pub const kCGBackstopMenuLevel: i32 = -20;
+    pub const kCGNormalWindowLevel: i32 = 0;
+    pub const kCGFloatingWindowLevel: i32 = 3;
+    pub const kCGTornOffMenuWindowLevel: i32 = 3;
+    pub const kCGModalPanelWindowLevel: i32 = 8;
+    pub const kCGUtilityWindowLevel: i32 = 19;
+    pub const kCGDockWindowLevel: i32 = 20;
+    pub const kCGMainMenuWindowLevel: i32 = 24;
+    pub const kCGStatusWindowLevel: i32 = 25;
+    pub const kCGPopUpMenuWindowLevel: i32 = 101;
+    pub const kCGOverlayWindowLevel: i32 = 102;
+    pub const kCGHelpWindowLevel: i32 = 200;
+    pub const kCGDraggingWindowLevel: i32 = 500;
+    pub const kCGScreenSaverWindowLevel: i32 = 1000;
+    pub const kCGAssistiveTechHighWindowLevel: i32 = 1500;
+    pub const kCGCursorWindowLevel: i32 = kCGMaximumWindowLevel - 1;
+}
+
+pub use window_level::*;

src/platform_impl/macos/menu.rs

@@ -1,36 +1,49 @@
-use icrate::ns_string;
-use icrate::Foundation::{NSProcessInfo, NSString};
+use icrate::AppKit::{
+    NSApplication, NSEventModifierFlagCommand, NSEventModifierFlagOption, NSEventModifierFlags,
+    NSMenu, NSMenuItem,
+};
+use icrate::Foundation::{ns_string, MainThreadMarker, NSProcessInfo, NSString};
 use objc2::rc::Id;
 use objc2::runtime::Sel;
 use objc2::sel;
 
-use super::appkit::{NSApp, NSEventModifierFlags, NSMenu, NSMenuItem};
-
 struct KeyEquivalent<'a> {
     key: &'a NSString,
     masks: Option<NSEventModifierFlags>,
 }
 
-pub fn initialize() {
-    let menubar = NSMenu::new();
-    let app_menu_item = NSMenuItem::new();
+pub fn initialize(app: &NSApplication) {
+    let mtm = MainThreadMarker::from(app);
+    let menubar = NSMenu::new(mtm);
+    let app_menu_item = NSMenuItem::new(mtm);
     menubar.addItem(&app_menu_item);
 
-    let app_menu = NSMenu::new();
+    let app_menu = NSMenu::new(mtm);
     let process_name = NSProcessInfo::processInfo().processName();
 
     // About menu item
     let about_item_title = ns_string!("About ").stringByAppendingString(&process_name);
-    let about_item = menu_item(&about_item_title, sel!(orderFrontStandardAboutPanel:), None);
+    let about_item = menu_item(
+        mtm,
+        &about_item_title,
+        Some(sel!(orderFrontStandardAboutPanel:)),
+        None,
+    );
+
+    // Services menu item
+    let services_menu = NSMenu::new(mtm);
+    let services_item = menu_item(mtm, ns_string!("Services"), None, None);
+    services_item.setSubmenu(Some(&services_menu));
 
     // Seperator menu item
-    let sep_first = NSMenuItem::separatorItem();
+    let sep_first = NSMenuItem::separatorItem(mtm);
 
     // Hide application menu item
     let hide_item_title = ns_string!("Hide ").stringByAppendingString(&process_name);
     let hide_item = menu_item(
+        mtm,
         &hide_item_title,
-        sel!(hide:),
+        Some(sel!(hide:)),
         Some(KeyEquivalent {
             key: ns_string!("h"),
             masks: None,
@@ -40,28 +53,33 @@ pub fn initialize() {
     // Hide other applications menu item
     let hide_others_item_title = ns_string!("Hide Others");
     let hide_others_item = menu_item(
+        mtm,
         hide_others_item_title,
-        sel!(hideOtherApplications:),
+        Some(sel!(hideOtherApplications:)),
         Some(KeyEquivalent {
             key: ns_string!("h"),
-            masks: Some(
-                NSEventModifierFlags::NSAlternateKeyMask | NSEventModifierFlags::NSCommandKeyMask,
-            ),
+            masks: Some(NSEventModifierFlagOption | NSEventModifierFlagCommand),
         }),
     );
 
     // Show applications menu item
     let show_all_item_title = ns_string!("Show All");
-    let show_all_item = menu_item(show_all_item_title, sel!(unhideAllApplications:), None);
+    let show_all_item = menu_item(
+        mtm,
+        show_all_item_title,
+        Some(sel!(unhideAllApplications:)),
+        None,
+    );
 
     // Seperator menu item
-    let sep = NSMenuItem::separatorItem();
+    let sep = NSMenuItem::separatorItem(mtm);
 
     // Quit application menu item
     let quit_item_title = ns_string!("Quit ").stringByAppendingString(&process_name);
     let quit_item = menu_item(
+        mtm,
         &quit_item_title,
-        sel!(terminate:),
+        Some(sel!(terminate:)),
         Some(KeyEquivalent {
             key: ns_string!("q"),
             masks: None,
@@ -70,27 +88,31 @@ pub fn initialize() {
 
     app_menu.addItem(&about_item);
     app_menu.addItem(&sep_first);
+    app_menu.addItem(&services_item);
     app_menu.addItem(&hide_item);
     app_menu.addItem(&hide_others_item);
     app_menu.addItem(&show_all_item);
     app_menu.addItem(&sep);
     app_menu.addItem(&quit_item);
-    app_menu_item.setSubmenu(&app_menu);
+    app_menu_item.setSubmenu(Some(&app_menu));
 
-    let app = NSApp();
-    app.setMainMenu(&menubar);
+    unsafe { app.setServicesMenu(Some(&services_menu)) };
+    app.setMainMenu(Some(&menubar));
 }
 
 fn menu_item(
+    mtm: MainThreadMarker,
     title: &NSString,
-    selector: Sel,
+    selector: Option<Sel>,
     key_equivalent: Option<KeyEquivalent<'_>>,
 ) -> Id<NSMenuItem> {
     let (key, masks) = match key_equivalent {
         Some(ke) => (ke.key, ke.masks),
         None => (ns_string!(""), None),
     };
-    let item = NSMenuItem::newWithTitle(title, selector, key);
+    let item = unsafe {
+        NSMenuItem::initWithTitle_action_keyEquivalent(mtm.alloc(), title, selector, key)
+    };
     if let Some(masks) = masks {
         item.setKeyEquivalentModifierMask(masks)
     }

src/platform_impl/macos/mod.rs

@@ -4,7 +4,7 @@ mod util;
 mod app;
 mod app_delegate;
 mod app_state;
-mod appkit;
+mod cursor;
 mod event;
 mod event_loop;
 mod ffi;
@@ -27,7 +27,9 @@ pub(crate) use self::{
 };
 use crate::event::DeviceId as RootDeviceId;
 
-pub(crate) use self::window::Window;
+pub(crate) use self::cursor::CustomCursor as PlatformCustomCursor;
+pub(crate) use self::window::{OwnedWindowHandle, Window};
+pub(crate) use crate::cursor::OnlyCursorImageBuilder as PlatformCustomCursorBuilder;
 pub(crate) use crate::icon::NoIcon as PlatformIcon;
 pub(crate) use crate::platform_impl::Fullscreen;
 

src/platform_impl/macos/monitor.rs

@@ -10,9 +10,10 @@ use core_foundation::{
 use core_graphics::display::{
     CGDirectDisplayID, CGDisplay, CGDisplayBounds, CGDisplayCopyDisplayMode,
 };
-use objc2::rc::Id;
+use icrate::AppKit::NSScreen;
+use icrate::Foundation::{ns_string, MainThreadMarker, NSNumber};
+use objc2::{rc::Id, runtime::AnyObject};
 
-use super::appkit::NSScreen;
 use super::ffi;
 use crate::dpi::{PhysicalPosition, PhysicalSize};
 
@@ -210,10 +211,12 @@ impl MonitorHandle {
     }
 
     pub fn scale_factor(&self) -> f64 {
-        match self.ns_screen() {
-            Some(screen) => screen.backingScaleFactor() as f64,
-            None => 1.0, // default to 1.0 when we can't find the screen
-        }
+        MainThreadMarker::run_on_main(|mtm| {
+            match self.ns_screen(mtm) {
+                Some(screen) => screen.backingScaleFactor() as f64,
+                None => 1.0, // default to 1.0 when we can't find the screen
+            }
+        })
     }
 
     pub fn refresh_rate_millihertz(&self) -> Option<u32> {
@@ -303,10 +306,10 @@ impl MonitorHandle {
         }
     }
 
-    pub(crate) fn ns_screen(&self) -> Option<Id<NSScreen>> {
+    pub(crate) fn ns_screen(&self, mtm: MainThreadMarker) -> Option<Id<NSScreen>> {
         let uuid = unsafe { ffi::CGDisplayCreateUUIDFromDisplayID(self.0) };
-        NSScreen::screens().into_iter().find(|screen| {
-            let other_native_id = screen.display_id();
+        NSScreen::screens(mtm).into_iter().find(|screen| {
+            let other_native_id = get_display_id(screen);
             let other_uuid = unsafe {
                 ffi::CGDisplayCreateUUIDFromDisplayID(other_native_id as CGDirectDisplayID)
             };
@@ -314,3 +317,25 @@ impl MonitorHandle {
         })
     }
 }
+
+pub(crate) fn get_display_id(screen: &NSScreen) -> u32 {
+    let key = ns_string!("NSScreenNumber");
+
+    objc2::rc::autoreleasepool(|_| {
+        let device_description = screen.deviceDescription();
+
+        // Retrieve the CGDirectDisplayID associated with this screen
+        //
+        // SAFETY: The value from @"NSScreenNumber" in deviceDescription is guaranteed
+        // to be an NSNumber. See documentation for `deviceDescription` for details:
+        // <https://developer.apple.com/documentation/appkit/nsscreen/1388360-devicedescription?language=objc>
+        let obj = device_description
+            .get(key)
+            .expect("failed getting screen display id from device description");
+        let obj: *const AnyObject = obj;
+        let obj: *const NSNumber = obj.cast();
+        let obj: &NSNumber = unsafe { &*obj };
+
+        obj.as_u32()
+    })
+}

src/platform_impl/macos/observer.rs

@@ -21,6 +21,7 @@ use core_foundation::runloop::{
     CFRunLoopObserverRef, CFRunLoopRef, CFRunLoopTimerCreate, CFRunLoopTimerInvalidate,
     CFRunLoopTimerRef, CFRunLoopTimerSetNextFireDate,
 };
+use icrate::Foundation::MainThreadMarker;
 
 unsafe fn control_flow_handler<F>(panic_info: *mut c_void, f: F)
 where
@@ -36,7 +37,8 @@ where
     // However we want to keep that weak reference around after the function.
     std::mem::forget(info_from_raw);
 
-    stop_app_on_panic(Weak::clone(&panic_info), move || {
+    let mtm = MainThreadMarker::new().unwrap();
+    stop_app_on_panic(mtm, Weak::clone(&panic_info), move || {
         let _ = &panic_info;
         f(panic_info.0)
     });

src/platform_impl/macos/view.rs

@@ -1,25 +1,27 @@
 #![allow(clippy::unnecessary_cast)]
-use std::boxed::Box;
 use std::cell::{Cell, RefCell};
 use std::collections::{HashMap, VecDeque};
-use std::ptr::NonNull;
+use std::ptr;
 
-use icrate::Foundation::{
-    NSArray, NSAttributedString, NSAttributedStringKey, NSCopying, NSMutableAttributedString,
-    NSObject, NSObjectProtocol, NSPoint, NSRange, NSRect, NSSize, NSString, NSUInteger,
+use icrate::AppKit::{
+    NSApplication, NSCursor, NSEvent, NSEventPhaseBegan, NSEventPhaseCancelled,
+    NSEventPhaseChanged, NSEventPhaseEnded, NSEventPhaseMayBegin, NSResponder, NSTextInputClient,
+    NSTrackingRectTag, NSView,
+};
+use icrate::Foundation::{
+    MainThreadMarker, NSArray, NSAttributedString, NSAttributedStringKey, NSCopying,
+    NSMutableAttributedString, NSObject, NSObjectProtocol, NSPoint, NSRange, NSRect, NSSize,
+    NSString, NSUInteger,
 };
-use objc2::declare::{Ivar, IvarDrop};
 use objc2::rc::{Id, WeakId};
 use objc2::runtime::{AnyObject, Sel};
-use objc2::{class, declare_class, msg_send, msg_send_id, mutability, sel, ClassType};
-
-use super::{
-    appkit::{
-        NSApp, NSCursor, NSEvent, NSEventPhase, NSResponder, NSTextInputClient, NSTrackingRectTag,
-        NSView,
-    },
-    event::{code_to_key, code_to_location},
+use objc2::{
+    class, declare_class, msg_send, msg_send_id, mutability, sel, ClassType, DeclaredClass,
 };
+
+use super::cursor::{default_cursor, invisible_cursor};
+use super::event::{code_to_key, code_to_location};
+use super::event::{lalt_pressed, ralt_pressed};
 use crate::{
     dpi::{LogicalPosition, LogicalSize},
     event::{
@@ -49,7 +51,7 @@ impl Default for CursorState {
     fn default() -> Self {
         Self {
             visible: true,
-            cursor: Default::default(),
+            cursor: default_cursor(),
         }
     }
 }
@@ -140,93 +142,50 @@ pub struct ViewState {
 
     marked_text: RefCell<Id<NSMutableAttributedString>>,
     accepts_first_mouse: bool,
+
+    // Weak reference because the window keeps a strong reference to the view
+    _ns_window: WeakId<WinitWindow>,
 }
 
 declare_class!(
-    #[derive(Debug)]
-    #[allow(non_snake_case)]
-    pub(super) struct WinitView {
-        // Weak reference because the window keeps a strong reference to the view
-        _ns_window: IvarDrop<Box<WeakId<WinitWindow>>, "__ns_window">,
-        state: IvarDrop<Box<ViewState>, "_state">,
-    }
-
-    mod ivars;
+    pub(super) struct WinitView;
 
     unsafe impl ClassType for WinitView {
         #[inherits(NSResponder, NSObject)]
         type Super = NSView;
-        type Mutability = mutability::InteriorMutable;
+        type Mutability = mutability::MainThreadOnly;
         const NAME: &'static str = "WinitView";
     }
 
-    unsafe impl WinitView {
-        #[method(initWithId:acceptsFirstMouse:)]
-        unsafe fn init_with_id(
-            this: *mut Self,
-            window: &WinitWindow,
-            accepts_first_mouse: bool,
-        ) -> Option<NonNull<Self>> {
-            let this: Option<&mut Self> = unsafe { msg_send![super(this), init] };
-            this.map(|this| {
-                let state = ViewState {
-                    accepts_first_mouse,
-                    ..Default::default()
-                };
-
-                Ivar::write(
-                    &mut this._ns_window,
-                    Box::new(WeakId::new(&window.retain())),
-                );
-                Ivar::write(&mut this.state, Box::new(state));
-
-                this.setPostsFrameChangedNotifications(true);
-
-                let notification_center: &AnyObject =
-                    unsafe { msg_send![class!(NSNotificationCenter), defaultCenter] };
-                // About frame change
-                let frame_did_change_notification_name =
-                    NSString::from_str("NSViewFrameDidChangeNotification");
-                #[allow(clippy::let_unit_value)]
-                unsafe {
-                    let _: () = msg_send![
-                        notification_center,
-                        addObserver: &*this,
-                        selector: sel!(frameDidChange:),
-                        name: &*frame_did_change_notification_name,
-                        object: &*this,
-                    ];
-                }
-
-                *this.state.input_source.borrow_mut() = this.current_input_source();
-                NonNull::from(this)
-            })
-        }
+    impl DeclaredClass for WinitView {
+        type Ivars = ViewState;
     }
 
     unsafe impl WinitView {
         #[method(viewDidMoveToWindow)]
         fn view_did_move_to_window(&self) {
             trace_scope!("viewDidMoveToWindow");
-            if let Some(tracking_rect) = self.state.tracking_rect.take() {
+            if let Some(tracking_rect) = self.ivars().tracking_rect.take() {
                 self.removeTrackingRect(tracking_rect);
             }
 
             let rect = self.frame();
-            let tracking_rect = self.add_tracking_rect(rect, false);
-            self.state.tracking_rect.set(Some(tracking_rect));
+            let tracking_rect = unsafe { self.addTrackingRect_owner_userData_assumeInside(rect, self, ptr::null_mut(), false) };
+            assert_ne!(tracking_rect, 0, "failed adding tracking rect");
+            self.ivars().tracking_rect.set(Some(tracking_rect));
         }
 
         #[method(frameDidChange:)]
         fn frame_did_change(&self, _event: &NSEvent) {
             trace_scope!("frameDidChange:");
-            if let Some(tracking_rect) = self.state.tracking_rect.take() {
+            if let Some(tracking_rect) = self.ivars().tracking_rect.take() {
                 self.removeTrackingRect(tracking_rect);
             }
 
             let rect = self.frame();
-            let tracking_rect = self.add_tracking_rect(rect, false);
-            self.state.tracking_rect.set(Some(tracking_rect));
+            let tracking_rect = unsafe { self.addTrackingRect_owner_userData_assumeInside(rect, self, ptr::null_mut(), false) };
+            assert_ne!(tracking_rect, 0, "failed adding tracking rect");
+            self.ivars().tracking_rect.set(Some(tracking_rect));
 
             // Emit resize event here rather than from windowDidResize because:
             // 1. When a new window is created as a tab, the frame size may change without a window resize occurring.
@@ -241,7 +200,7 @@ declare_class!(
             trace_scope!("drawRect:");
 
             // It's a workaround for https://github.com/rust-windowing/winit/issues/2640, don't replace with `self.window_id()`.
-            if let Some(window) = self._ns_window.load() {
+            if let Some(window) = self.ivars()._ns_window.load() {
                 AppState::handle_redraw(WindowId(window.id()));
             }
 
@@ -270,12 +229,12 @@ declare_class!(
         fn reset_cursor_rects(&self) {
             trace_scope!("resetCursorRects");
             let bounds = self.bounds();
-            let cursor_state = self.state.cursor_state.borrow();
+            let cursor_state = self.ivars().cursor_state.borrow();
             // We correctly invoke `addCursorRect` only from inside `resetCursorRects`
             if cursor_state.visible {
-                self.addCursorRect(bounds, &cursor_state.cursor);
+                self.addCursorRect_cursor(bounds, &cursor_state.cursor);
             } else {
-                self.addCursorRect(bounds, &NSCursor::invisible());
+                self.addCursorRect_cursor(bounds, &invisible_cursor());
             }
         }
     }
@@ -284,13 +243,13 @@ declare_class!(
         #[method(hasMarkedText)]
         fn has_marked_text(&self) -> bool {
             trace_scope!("hasMarkedText");
-            self.state.marked_text.borrow().length() > 0
+            self.ivars().marked_text.borrow().length() > 0
         }
 
         #[method(markedRange)]
         fn marked_range(&self) -> NSRange {
             trace_scope!("markedRange");
-            let length = self.state.marked_text.borrow().length();
+            let length = self.ivars().marked_text.borrow().length();
             if length > 0 {
                 NSRange::new(0, length)
             } else {
@@ -333,19 +292,19 @@ declare_class!(
             };
 
             // Update marked text.
-            *self.state.marked_text.borrow_mut() = marked_text;
+            *self.ivars().marked_text.borrow_mut() = marked_text;
 
             // Notify IME is active if application still doesn't know it.
-            if self.state.ime_state.get() == ImeState::Disabled {
-                *self.state.input_source.borrow_mut() = self.current_input_source();
+            if self.ivars().ime_state.get() == ImeState::Disabled {
+                *self.ivars().input_source.borrow_mut() = self.current_input_source();
                 self.queue_event(WindowEvent::Ime(Ime::Enabled));
             }
 
-            if self.hasMarkedText() {
-                self.state.ime_state.set(ImeState::Preedit);
+            if unsafe { self.hasMarkedText() } {
+                self.ivars().ime_state.set(ImeState::Preedit);
             } else {
                 // In case the preedit was cleared, set IME into the Ground state.
-                self.state.ime_state.set(ImeState::Ground);
+                self.ivars().ime_state.set(ImeState::Ground);
             }
 
             // Empty string basically means that there's no preedit, so indicate that by sending
@@ -363,15 +322,15 @@ declare_class!(
         #[method(unmarkText)]
         fn unmark_text(&self) {
             trace_scope!("unmarkText");
-            *self.state.marked_text.borrow_mut() = NSMutableAttributedString::new();
+            *self.ivars().marked_text.borrow_mut() = NSMutableAttributedString::new();
 
             let input_context = self.inputContext().expect("input context");
             input_context.discardMarkedText();
 
             self.queue_event(WindowEvent::Ime(Ime::Preedit(String::new(), None)));
             if self.is_ime_enabled() {
-                // Leave the Preedit self.state
-                self.state.ime_state.set(ImeState::Ground);
+                // Leave the Preedit self.ivars()
+                self.ivars().ime_state.set(ImeState::Ground);
             } else {
                 warn!("Expected to have IME enabled when receiving unmarkText");
             }
@@ -410,9 +369,9 @@ declare_class!(
             let content_rect = window.contentRectForFrameRect(window.frame());
             let base_x = content_rect.origin.x as f64;
             let base_y = (content_rect.origin.y + content_rect.size.height) as f64;
-            let x = base_x + self.state.ime_position.get().x;
-            let y = base_y - self.state.ime_position.get().y;
-            let LogicalSize { width, height } = self.state.ime_size.get();
+            let x = base_x + self.ivars().ime_position.get().x;
+            let y = base_y - self.ivars().ime_position.get().y;
+            let LogicalSize { width, height } = self.ivars().ime_size.get();
             NSRect::new(NSPoint::new(x as _, y as _), NSSize::new(width, height))
         }
 
@@ -434,10 +393,10 @@ declare_class!(
             let is_control = string.chars().next().map_or(false, |c| c.is_control());
 
             // Commit only if we have marked text.
-            if self.hasMarkedText() && self.is_ime_enabled() && !is_control {
+            if unsafe { self.hasMarkedText() } && self.is_ime_enabled() && !is_control {
                 self.queue_event(WindowEvent::Ime(Ime::Preedit(String::new(), None)));
                 self.queue_event(WindowEvent::Ime(Ime::Commit(string)));
-                self.state.ime_state.set(ImeState::Commited);
+                self.ivars().ime_state.set(ImeState::Commited);
             }
         }
 
@@ -449,15 +408,15 @@ declare_class!(
             // We shouldn't forward any character from just commited text, since we'll end up sending
             // it twice with some IMEs like Korean one. We'll also always send `Enter` in that case,
             // which is not desired given it was used to confirm IME input.
-            if self.state.ime_state.get() == ImeState::Commited {
+            if self.ivars().ime_state.get() == ImeState::Commited {
                 return;
             }
 
-            self.state.forward_key_to_app.set(true);
+            self.ivars().forward_key_to_app.set(true);
 
-            if self.hasMarkedText() && self.state.ime_state.get() == ImeState::Preedit {
+            if unsafe { self.hasMarkedText() } && self.ivars().ime_state.get() == ImeState::Preedit {
                 // Leave preedit so that we also report the key-up for this key.
-                self.state.ime_state.set(ImeState::Ground);
+                self.ivars().ime_state.set(ImeState::Ground);
             }
         }
     }
@@ -467,19 +426,19 @@ declare_class!(
         fn key_down(&self, event: &NSEvent) {
             trace_scope!("keyDown:");
             {
-                let mut prev_input_source = self.state.input_source.borrow_mut();
+                let mut prev_input_source = self.ivars().input_source.borrow_mut();
                 let current_input_source = self.current_input_source();
                 if *prev_input_source != current_input_source && self.is_ime_enabled() {
                     *prev_input_source = current_input_source;
                     drop(prev_input_source);
-                    self.state.ime_state.set(ImeState::Disabled);
+                    self.ivars().ime_state.set(ImeState::Disabled);
                     self.queue_event(WindowEvent::Ime(Ime::Disabled));
                 }
             }
 
             // Get the characters from the event.
-            let old_ime_state = self.state.ime_state.get();
-            self.state.forward_key_to_app.set(false);
+            let old_ime_state = self.ivars().ime_state.get();
+            self.ivars().forward_key_to_app.set(false);
             let event = replace_event(event, self.window().option_as_alt());
 
             // The `interpretKeyEvents` function might call
@@ -488,32 +447,32 @@ declare_class!(
             // we must send the `KeyboardInput` event during IME if it triggered
             // `doCommandBySelector`. (doCommandBySelector means that the keyboard input
             // is not handled by IME and should be handled by the application)
-            if self.state.ime_allowed.get() {
+            if self.ivars().ime_allowed.get() {
                 let events_for_nsview = NSArray::from_slice(&[&*event]);
                 unsafe { self.interpretKeyEvents(&events_for_nsview) };
 
                 // If the text was commited we must treat the next keyboard event as IME related.
-                if self.state.ime_state.get() == ImeState::Commited {
+                if self.ivars().ime_state.get() == ImeState::Commited {
                     // Remove any marked text, so normal input can continue.
-                    *self.state.marked_text.borrow_mut() = NSMutableAttributedString::new();
+                    *self.ivars().marked_text.borrow_mut() = NSMutableAttributedString::new();
                 }
             }
 
             self.update_modifiers(&event, false);
 
-            let had_ime_input = match self.state.ime_state.get() {
+            let had_ime_input = match self.ivars().ime_state.get() {
                 ImeState::Commited => {
                     // Allow normal input after the commit.
-                    self.state.ime_state.set(ImeState::Ground);
+                    self.ivars().ime_state.set(ImeState::Ground);
                     true
                 }
                 ImeState::Preedit => true,
                 // `key_down` could result in preedit clear, so compare old and current state.
-                _ => old_ime_state != self.state.ime_state.get(),
+                _ => old_ime_state != self.ivars().ime_state.get(),
             };
 
-            if !had_ime_input || self.state.forward_key_to_app.get() {
-                let key_event = create_key_event(&event, true, event.is_a_repeat(), None);
+            if !had_ime_input || self.ivars().forward_key_to_app.get() {
+                let key_event = create_key_event(&event, true, unsafe { event.isARepeat() }, None);
                 self.queue_event(WindowEvent::KeyboardInput {
                     device_id: DEVICE_ID,
                     event: key_event,
@@ -531,7 +490,7 @@ declare_class!(
 
             // We want to send keyboard input when we are currently in the ground state.
             if matches!(
-                self.state.ime_state.get(),
+                self.ivars().ime_state.get(),
                 ImeState::Ground | ImeState::Disabled
             ) {
                 self.queue_event(WindowEvent::KeyboardInput {
@@ -575,14 +534,15 @@ declare_class!(
         // https://bugs.eclipse.org/bugs/show_bug.cgi?id=300620#c6
         #[method(cancelOperation:)]
         fn cancel_operation(&self, _sender: Option<&AnyObject>) {
+            let mtm = MainThreadMarker::from(self);
             trace_scope!("cancelOperation:");
 
-            let event = NSApp()
+            let event = NSApplication::sharedApplication(mtm)
                 .currentEvent()
                 .expect("could not find current event");
 
             self.update_modifiers(&event, false);
-            let event = create_key_event(&event, true, event.is_a_repeat(), None);
+            let event = create_key_event(&event, true, unsafe { event.isARepeat() }, None);
 
             self.queue_event(WindowEvent::KeyboardInput {
                 device_id: DEVICE_ID,
@@ -679,8 +639,8 @@ declare_class!(
             self.mouse_motion(event);
 
             let delta = {
-                let (x, y) = (event.scrollingDeltaX(), event.scrollingDeltaY());
-                if event.hasPreciseScrollingDeltas() {
+                let (x, y) = unsafe { (event.scrollingDeltaX(), event.scrollingDeltaY()) };
+                if unsafe { event.hasPreciseScrollingDeltas() } {
                     let delta = LogicalPosition::new(x, y).to_physical(self.scale_factor());
                     MouseScrollDelta::PixelDelta(delta)
                 } else {
@@ -692,18 +652,19 @@ declare_class!(
             // be mutually exclusive anyhow, which is why the API is rather incoherent). If no momentum
             // phase is recorded (or rather, the started/ended cases of the momentum phase) then we
             // report the touch phase.
-            let phase = match event.momentumPhase() {
-                NSEventPhase::NSEventPhaseMayBegin | NSEventPhase::NSEventPhaseBegan => {
+            #[allow(non_upper_case_globals)]
+            let phase = match unsafe { event.momentumPhase() } {
+                NSEventPhaseMayBegin | NSEventPhaseBegan => {
                     TouchPhase::Started
                 }
-                NSEventPhase::NSEventPhaseEnded | NSEventPhase::NSEventPhaseCancelled => {
+                NSEventPhaseEnded | NSEventPhaseCancelled => {
                     TouchPhase::Ended
                 }
-                _ => match event.phase() {
-                    NSEventPhase::NSEventPhaseMayBegin | NSEventPhase::NSEventPhaseBegan => {
+                _ => match unsafe { event.phase() } {
+                    NSEventPhaseMayBegin | NSEventPhaseBegan => {
                         TouchPhase::Started
                     }
-                    NSEventPhase::NSEventPhaseEnded | NSEventPhase::NSEventPhaseCancelled => {
+                    NSEventPhaseEnded | NSEventPhaseCancelled => {
                         TouchPhase::Ended
                     }
                     _ => TouchPhase::Moved,
@@ -724,17 +685,18 @@ declare_class!(
         fn magnify_with_event(&self, event: &NSEvent) {
             trace_scope!("magnifyWithEvent:");
 
-            let phase = match event.phase() {
-                NSEventPhase::NSEventPhaseBegan => TouchPhase::Started,
-                NSEventPhase::NSEventPhaseChanged => TouchPhase::Moved,
-                NSEventPhase::NSEventPhaseCancelled => TouchPhase::Cancelled,
-                NSEventPhase::NSEventPhaseEnded => TouchPhase::Ended,
+            #[allow(non_upper_case_globals)]
+            let phase = match unsafe { event.phase() } {
+                NSEventPhaseBegan => TouchPhase::Started,
+                NSEventPhaseChanged => TouchPhase::Moved,
+                NSEventPhaseCancelled => TouchPhase::Cancelled,
+                NSEventPhaseEnded => TouchPhase::Ended,
                 _ => return,
             };
 
             self.queue_event(WindowEvent::TouchpadMagnify {
                 device_id: DEVICE_ID,
-                delta: event.magnification(),
+                delta: unsafe { event.magnification() },
                 phase,
             });
         }
@@ -752,17 +714,18 @@ declare_class!(
         fn rotate_with_event(&self, event: &NSEvent) {
             trace_scope!("rotateWithEvent:");
 
-            let phase = match event.phase() {
-                NSEventPhase::NSEventPhaseBegan => TouchPhase::Started,
-                NSEventPhase::NSEventPhaseChanged => TouchPhase::Moved,
-                NSEventPhase::NSEventPhaseCancelled => TouchPhase::Cancelled,
-                NSEventPhase::NSEventPhaseEnded => TouchPhase::Ended,
+            #[allow(non_upper_case_globals)]
+            let phase = match unsafe { event.phase() } {
+                NSEventPhaseBegan => TouchPhase::Started,
+                NSEventPhaseChanged => TouchPhase::Moved,
+                NSEventPhaseCancelled => TouchPhase::Cancelled,
+                NSEventPhaseEnded => TouchPhase::Ended,
                 _ => return,
             };
 
             self.queue_event(WindowEvent::TouchpadRotate {
                 device_id: DEVICE_ID,
-                delta: event.rotation(),
+                delta: unsafe { event.rotation() },
                 phase,
             });
         }
@@ -775,8 +738,8 @@ declare_class!(
 
             self.queue_event(WindowEvent::TouchpadPressure {
                 device_id: DEVICE_ID,
-                pressure: event.pressure(),
-                stage: event.stage() as i64,
+                pressure: unsafe { event.pressure() },
+                stage: unsafe { event.stage() } as i64,
             });
         }
 
@@ -792,20 +755,41 @@ declare_class!(
         #[method(acceptsFirstMouse:)]
         fn accepts_first_mouse(&self, _event: &NSEvent) -> bool {
             trace_scope!("acceptsFirstMouse:");
-            self.state.accepts_first_mouse
+            self.ivars().accepts_first_mouse
         }
     }
 );
 
 impl WinitView {
     pub(super) fn new(window: &WinitWindow, accepts_first_mouse: bool) -> Id<Self> {
+        let mtm = MainThreadMarker::from(window);
+        let this = mtm.alloc().set_ivars(ViewState {
+            accepts_first_mouse,
+            _ns_window: WeakId::new(&window.retain()),
+            ..Default::default()
+        });
+        let this: Id<Self> = unsafe { msg_send_id![super(this), init] };
+
+        this.setPostsFrameChangedNotifications(true);
+        let notification_center: &AnyObject =
+            unsafe { msg_send![class!(NSNotificationCenter), defaultCenter] };
+        // About frame change
+        let frame_did_change_notification_name =
+            NSString::from_str("NSViewFrameDidChangeNotification");
+        #[allow(clippy::let_unit_value)]
         unsafe {
-            msg_send_id![
-                Self::alloc(),
-                initWithId: window,
-                acceptsFirstMouse: accepts_first_mouse,
-            ]
+            let _: () = msg_send![
+                notification_center,
+                addObserver: &*this,
+                selector: sel!(frameDidChange:),
+                name: &*frame_did_change_notification_name,
+                object: &*this,
+            ];
         }
+
+        *this.ivars().input_source.borrow_mut() = this.current_input_source();
+
+        this
     }
 
     fn window(&self) -> Id<WinitWindow> {
@@ -814,7 +798,10 @@ impl WinitView {
         // (which is incompatible with `frameDidChange:`)
         //
         // unsafe { msg_send_id![self, window] }
-        self._ns_window.load().expect("view to have a window")
+        self.ivars()
+            ._ns_window
+            .load()
+            .expect("view to have a window")
     }
 
     fn window_id(&self) -> WindowId {
@@ -842,7 +829,7 @@ impl WinitView {
     }
 
     fn is_ime_enabled(&self) -> bool {
-        !matches!(self.state.ime_state.get(), ImeState::Disabled)
+        !matches!(self.ivars().ime_state.get(), ImeState::Disabled)
     }
 
     fn current_input_source(&self) -> String {
@@ -854,7 +841,7 @@ impl WinitView {
     }
 
     pub(super) fn set_cursor_icon(&self, icon: Id<NSCursor>) {
-        let mut cursor_state = self.state.cursor_state.borrow_mut();
+        let mut cursor_state = self.ivars().cursor_state.borrow_mut();
         cursor_state.cursor = icon;
     }
 
@@ -862,7 +849,7 @@ impl WinitView {
     ///
     /// Returns whether the state changed.
     pub(super) fn set_cursor_visible(&self, visible: bool) -> bool {
-        let mut cursor_state = self.state.cursor_state.borrow_mut();
+        let mut cursor_state = self.ivars().cursor_state.borrow_mut();
         if visible != cursor_state.visible {
             cursor_state.visible = visible;
             true
@@ -872,19 +859,19 @@ impl WinitView {
     }
 
     pub(super) fn set_ime_allowed(&self, ime_allowed: bool) {
-        if self.state.ime_allowed.get() == ime_allowed {
+        if self.ivars().ime_allowed.get() == ime_allowed {
             return;
         }
-        self.state.ime_allowed.set(ime_allowed);
-        if self.state.ime_allowed.get() {
+        self.ivars().ime_allowed.set(ime_allowed);
+        if self.ivars().ime_allowed.get() {
             return;
         }
 
         // Clear markedText
-        *self.state.marked_text.borrow_mut() = NSMutableAttributedString::new();
+        *self.ivars().marked_text.borrow_mut() = NSMutableAttributedString::new();
 
-        if self.state.ime_state.get() != ImeState::Disabled {
-            self.state.ime_state.set(ImeState::Disabled);
+        if self.ivars().ime_state.get() != ImeState::Disabled {
+            self.ivars().ime_state.set(ImeState::Disabled);
             self.queue_event(WindowEvent::Ime(Ime::Disabled));
         }
     }
@@ -894,17 +881,17 @@ impl WinitView {
         position: LogicalPosition<f64>,
         size: LogicalSize<f64>,
     ) {
-        self.state.ime_position.set(position);
-        self.state.ime_size.set(size);
+        self.ivars().ime_position.set(position);
+        self.ivars().ime_size.set(size);
         let input_context = self.inputContext().expect("input context");
         input_context.invalidateCharacterCoordinates();
     }
 
     /// Reset modifiers and emit a synthetic ModifiersChanged event if deemed necessary.
     pub(super) fn reset_modifiers(&self) {
-        if !self.state.modifiers.get().state().is_empty() {
-            self.state.modifiers.set(Modifiers::default());
-            self.queue_event(WindowEvent::ModifiersChanged(self.state.modifiers.get()));
+        if !self.ivars().modifiers.get().state().is_empty() {
+            self.ivars().modifiers.set(Modifiers::default());
+            self.queue_event(WindowEvent::ModifiersChanged(self.ivars().modifiers.get()));
         }
     }
 
@@ -913,8 +900,8 @@ impl WinitView {
         use ElementState::{Pressed, Released};
 
         let current_modifiers = event_mods(ns_event);
-        let prev_modifiers = self.state.modifiers.get();
-        self.state.modifiers.set(current_modifiers);
+        let prev_modifiers = self.ivars().modifiers.get();
+        self.ivars().modifiers.set(current_modifiers);
 
         // This function was called form the flagsChanged event, which is triggered
         // when the user presses/releases a modifier even if the same kind of modifier
@@ -925,8 +912,8 @@ impl WinitView {
         // later will work though, since the flags are attached to the event and contain valid
         // information.
         'send_event: {
-            if is_flags_changed_event && ns_event.key_code() != 0 {
-                let scancode = ns_event.key_code();
+            if is_flags_changed_event && unsafe { ns_event.keyCode() } != 0 {
+                let scancode = unsafe { ns_event.keyCode() };
                 let physical_key = PhysicalKey::from_scancode(scancode as u32);
 
                 // We'll correct the `is_press` later.
@@ -943,7 +930,7 @@ impl WinitView {
                 event.location = code_to_location(physical_key);
                 let location_mask = ModLocationMask::from_location(event.location);
 
-                let mut phys_mod_state = self.state.phys_modifiers.borrow_mut();
+                let mut phys_mod_state = self.ivars().phys_modifiers.borrow_mut();
                 let phys_mod = phys_mod_state
                     .entry(key)
                     .or_insert(ModLocationMask::empty());
@@ -1021,7 +1008,7 @@ impl WinitView {
             return;
         }
 
-        self.queue_event(WindowEvent::ModifiersChanged(self.state.modifiers.get()));
+        self.queue_event(WindowEvent::ModifiersChanged(self.ivars().modifiers.get()));
     }
 
     fn mouse_click(&self, event: &NSEvent, button_state: ElementState) {
@@ -1037,7 +1024,7 @@ impl WinitView {
     }
 
     fn mouse_motion(&self, event: &NSEvent) {
-        let window_point = event.locationInWindow();
+        let window_point = unsafe { event.locationInWindow() };
         let view_point = self.convertPoint_fromView(window_point, None);
         let view_rect = self.frame();
 
@@ -1046,7 +1033,7 @@ impl WinitView {
             || view_point.x > view_rect.size.width
             || view_point.y > view_rect.size.height
         {
-            let mouse_buttons_down = NSEvent::pressedMouseButtons();
+            let mouse_buttons_down = unsafe { NSEvent::pressedMouseButtons() };
             if mouse_buttons_down == 0 {
                 // Point is outside of the client area (view) and no buttons are pressed
                 return;
@@ -1073,7 +1060,7 @@ fn mouse_button(event: &NSEvent) -> MouseButton {
     // For the other events, it's always set to 0.
     // MacOS only defines the left, right and middle buttons, 3..=31 are left as generic buttons,
     // but 3 and 4 are very commonly used as Back and Forward by hardware vendors and applications.
-    match event.buttonNumber() {
+    match unsafe { event.buttonNumber() } {
         0 => MouseButton::Left,
         1 => MouseButton::Right,
         2 => MouseButton::Middle,
@@ -1089,30 +1076,35 @@ fn mouse_button(event: &NSEvent) -> MouseButton {
 fn replace_event(event: &NSEvent, option_as_alt: OptionAsAlt) -> Id<NSEvent> {
     let ev_mods = event_mods(event).state;
     let ignore_alt_characters = match option_as_alt {
-        OptionAsAlt::OnlyLeft if event.lalt_pressed() => true,
-        OptionAsAlt::OnlyRight if event.ralt_pressed() => true,
+        OptionAsAlt::OnlyLeft if lalt_pressed(event) => true,
+        OptionAsAlt::OnlyRight if ralt_pressed(event) => true,
         OptionAsAlt::Both if ev_mods.alt_key() => true,
         _ => false,
     } && !ev_mods.control_key()
         && !ev_mods.super_key();
 
     if ignore_alt_characters {
-        let ns_chars = event
-            .charactersIgnoringModifiers()
-            .expect("expected characters to be non-null");
+        let ns_chars = unsafe {
+            event
+                .charactersIgnoringModifiers()
+                .expect("expected characters to be non-null")
+        };
 
-        NSEvent::keyEventWithType(
-            event.type_(),
-            event.locationInWindow(),
-            event.modifierFlags(),
-            event.timestamp(),
-            event.window_number(),
-            None,
-            &ns_chars,
-            &ns_chars,
-            event.is_a_repeat(),
-            event.key_code(),
-        )
+        unsafe {
+            NSEvent::keyEventWithType_location_modifierFlags_timestamp_windowNumber_context_characters_charactersIgnoringModifiers_isARepeat_keyCode(
+                event.r#type(),
+                event.locationInWindow(),
+                event.modifierFlags(),
+                event.timestamp(),
+                event.windowNumber(),
+                None,
+                &ns_chars,
+                &ns_chars,
+                event.isARepeat(),
+                event.keyCode(),
+            )
+            .unwrap()
+        }
     } else {
         event.copy()
     }

src/platform_impl/macos/window.rs

@@ -3,8 +3,6 @@
 use std::collections::VecDeque;
 use std::f64;
 use std::ops;
-use std::os::raw::c_void;
-use std::ptr::NonNull;
 use std::sync::{Mutex, MutexGuard};
 
 use crate::{
@@ -17,14 +15,13 @@ use crate::{
     platform::macos::{OptionAsAlt, WindowExtMacOS},
     platform_impl::platform::{
         app_state::AppState,
-        appkit::NSWindowOrderingMode,
         event_loop::EventLoopWindowTarget,
         ffi,
         monitor::{self, MonitorHandle, VideoMode},
         util,
         view::WinitView,
         window_delegate::WinitWindowDelegate,
-        Fullscreen, OsError,
+        Fullscreen, OsError, PlatformCustomCursor,
     },
     window::{
         CursorGrabMode, CursorIcon, ImePurpose, ResizeDirection, Theme, UserAttentionType,
@@ -32,22 +29,30 @@ use crate::{
     },
 };
 use core_graphics::display::{CGDisplay, CGPoint};
+use icrate::AppKit::{
+    NSAppKitVersionNumber, NSAppKitVersionNumber10_12, NSAppearance, NSApplication,
+    NSApplicationPresentationAutoHideDock, NSApplicationPresentationAutoHideMenuBar,
+    NSApplicationPresentationFullScreen, NSApplicationPresentationHideDock,
+    NSApplicationPresentationHideMenuBar, NSApplicationPresentationOptions, NSBackingStoreBuffered,
+    NSColor, NSCriticalRequest, NSFilenamesPboardType, NSInformationalRequest, NSResponder,
+    NSScreen, NSView, NSWindow, NSWindowAbove, NSWindowCloseButton, NSWindowFullScreenButton,
+    NSWindowLevel, NSWindowMiniaturizeButton, NSWindowSharingNone, NSWindowSharingReadOnly,
+    NSWindowStyleMask, NSWindowStyleMaskBorderless, NSWindowStyleMaskClosable,
+    NSWindowStyleMaskFullSizeContentView, NSWindowStyleMaskMiniaturizable,
+    NSWindowStyleMaskResizable, NSWindowStyleMaskTitled, NSWindowTabbingModePreferred,
+    NSWindowTitleHidden, NSWindowZoomButton,
+};
 use icrate::Foundation::{
-    CGFloat, MainThreadBound, MainThreadMarker, NSArray, NSCopying, NSInteger, NSObject, NSPoint,
-    NSRect, NSSize, NSString,
+    CGFloat, MainThreadBound, MainThreadMarker, NSArray, NSCopying, NSObject, NSPoint, NSRect,
+    NSSize, NSString,
 };
-use objc2::declare::{Ivar, IvarDrop};
 use objc2::rc::{autoreleasepool, Id};
-use objc2::{declare_class, msg_send, msg_send_id, mutability, sel, ClassType};
+use objc2::{declare_class, msg_send, msg_send_id, mutability, sel, ClassType, DeclaredClass};
 
-use super::appkit::{
-    NSApp, NSAppKitVersion, NSAppearance, NSApplicationPresentationOptions, NSBackingStoreType,
-    NSColor, NSCursor, NSFilenamesPboardType, NSRequestUserAttentionType, NSResponder, NSScreen,
-    NSView, NSWindow, NSWindowButton, NSWindowLevel, NSWindowSharingType, NSWindowStyleMask,
-    NSWindowTabbingMode, NSWindowTitleVisibility,
-};
-use super::ffi::CGSMainConnectionID;
-use super::ffi::CGSSetWindowBackgroundBlurRadius;
+use super::cursor::cursor_from_icon;
+use super::ffi::kCGFloatingWindowLevel;
+use super::ffi::{kCGNormalWindowLevel, CGSMainConnectionID, CGSSetWindowBackgroundBlurRadius};
+use super::monitor::get_display_id;
 
 pub(crate) struct Window {
     window: MainThreadBound<Id<WinitWindow>>,
@@ -58,7 +63,7 @@ pub(crate) struct Window {
 impl Drop for Window {
     fn drop(&mut self) {
         self.window
-            .get_on_main(|window, _| autoreleasepool(|_| window.close()))
+            .get_on_main(|window| autoreleasepool(|_| window.close()))
     }
 }
 
@@ -70,7 +75,8 @@ impl Window {
     ) -> Result<Self, RootOsError> {
         let mtm = MainThreadMarker::new()
             .expect("windows can only be created on the main thread on macOS");
-        let (window, _delegate) = autoreleasepool(|_| WinitWindow::new(attributes, pl_attribs))?;
+        let (window, _delegate) =
+            autoreleasepool(|_| WinitWindow::new(attributes, pl_attribs, mtm))?;
         Ok(Window {
             window: MainThreadBound::new(window, mtm),
             _delegate: MainThreadBound::new(_delegate, mtm),
@@ -86,7 +92,19 @@ impl Window {
         &self,
         f: impl FnOnce(&WinitWindow) -> R + Send,
     ) -> R {
-        self.window.get_on_main(|window, _mtm| f(window))
+        self.window.get_on_main(|window| f(window))
+    }
+
+    #[cfg(feature = "rwh_06")]
+    #[inline]
+    pub(crate) fn raw_window_handle_rwh_06(
+        &self,
+    ) -> Result<rwh_06::RawWindowHandle, rwh_06::HandleError> {
+        if let Some(mtm) = MainThreadMarker::new() {
+            Ok(self.window.get(mtm).raw_window_handle_rwh_06())
+        } else {
+            Err(rwh_06::HandleError::Unavailable)
+        }
     }
 }
 
@@ -111,6 +129,54 @@ impl From<u64> for WindowId {
     }
 }
 
+#[derive(Debug)]
+pub(crate) struct OwnedWindowHandle {
+    ns_view: MainThreadBound<Id<NSView>>,
+}
+
+impl Clone for OwnedWindowHandle {
+    fn clone(&self) -> Self {
+        Self {
+            ns_view: MainThreadMarker::run_on_main(|mtm| {
+                MainThreadBound::new(self.ns_view.get(mtm).clone(), mtm)
+            }),
+        }
+    }
+}
+
+impl OwnedWindowHandle {
+    #[cfg(feature = "rwh_06")]
+    pub(crate) fn new_parent_window(handle: rwh_06::WindowHandle<'_>) -> Self {
+        let mtm =
+            MainThreadMarker::new().expect("can only have handles on macOS on the main thread");
+        let ns_view = match handle.as_raw() {
+            rwh_06::RawWindowHandle::AppKit(handle) => {
+                // SAFETY: Taking `WindowHandle<'_>` ensures that the pointer is valid.
+                // Unwrap is fine, since the pointer comes from `NonNull`.
+                unsafe { Id::retain(handle.ns_view.as_ptr().cast()) }.unwrap()
+            }
+            handle => panic!("invalid window handle {handle:?} on macOS"),
+        };
+        Self {
+            ns_view: MainThreadBound::new(ns_view, mtm),
+        }
+    }
+
+    #[cfg(feature = "rwh_06")]
+    pub(crate) fn raw_window_handle(&self) -> Result<rwh_06::RawWindowHandle, rwh_06::HandleError> {
+        if let Some(mtm) = MainThreadMarker::new() {
+            let window_handle = rwh_06::AppKitWindowHandle::new({
+                let ptr = Id::as_ptr(self.ns_view.get(mtm)) as *mut _;
+                std::ptr::NonNull::new(ptr).expect("Id<T> should never be null")
+            });
+            let handle = rwh_06::RawWindowHandle::AppKit(window_handle);
+            Ok(handle)
+        } else {
+            Err(rwh_06::HandleError::Unavailable)
+        }
+    }
+}
+
 #[derive(Clone)]
 pub struct PlatformSpecificWindowBuilderAttributes {
     pub movable_by_window_background: bool,
@@ -147,52 +213,17 @@ impl Default for PlatformSpecificWindowBuilderAttributes {
 
 declare_class!(
     #[derive(Debug)]
-    pub struct WinitWindow {
-        // TODO: Fix unnecessary boxing here
-        shared_state: IvarDrop<Box<Mutex<SharedState>>, "_shared_state">,
-    }
-
-    mod ivars;
+    pub struct WinitWindow;
 
     unsafe impl ClassType for WinitWindow {
         #[inherits(NSResponder, NSObject)]
         type Super = NSWindow;
-        type Mutability = mutability::InteriorMutable;
+        type Mutability = mutability::MainThreadOnly;
         const NAME: &'static str = "WinitWindow";
     }
 
-    unsafe impl WinitWindow {
-        #[method(initWithContentRect:styleMask:state:)]
-        unsafe fn init(
-            this: *mut Self,
-            frame: NSRect,
-            mask: NSWindowStyleMask,
-            state: *mut c_void,
-        ) -> Option<NonNull<Self>> {
-            let this: Option<&mut Self> = unsafe {
-                msg_send![
-                    super(this),
-                    initWithContentRect: frame,
-                    styleMask: mask,
-                    backing: NSBackingStoreType::NSBackingStoreBuffered,
-                    defer: false,
-                ]
-            };
-
-            this.map(|this| {
-                // SAFETY: The pointer originally came from `Box::into_raw`.
-                Ivar::write(&mut this.shared_state, unsafe {
-                    Box::from_raw(state as *mut Mutex<SharedState>)
-                });
-
-                // It is imperative to correct memory management that we
-                // disable the extra release that would otherwise happen when
-                // calling `clone` on the window.
-                this.setReleasedWhenClosed(false);
-
-                NonNull::from(this)
-            })
-        }
+    impl DeclaredClass for WinitWindow {
+        type Ivars = Mutex<SharedState>;
     }
 
     unsafe impl WinitWindow {
@@ -293,6 +324,7 @@ impl WinitWindow {
     fn new(
         attrs: WindowAttributes,
         pl_attrs: PlatformSpecificWindowBuilderAttributes,
+        mtm: MainThreadMarker,
     ) -> Result<(Id<Self>, Id<WinitWindowDelegate>), RootOsError> {
         trace_scope!("WinitWindow::new");
 
@@ -300,15 +332,15 @@ impl WinitWindow {
             let screen = match attrs.fullscreen.0.clone().map(Into::into) {
                 Some(Fullscreen::Borderless(Some(monitor)))
                 | Some(Fullscreen::Exclusive(VideoMode { monitor, .. })) => {
-                    monitor.ns_screen().or_else(NSScreen::main)
+                    monitor.ns_screen(mtm).or_else(|| NSScreen::mainScreen(mtm))
                 }
-                Some(Fullscreen::Borderless(None)) => NSScreen::main(),
+                Some(Fullscreen::Borderless(None)) => NSScreen::mainScreen(mtm),
                 None => None,
             };
             let frame = match &screen {
                 Some(screen) => screen.frame(),
                 None => {
-                    let scale_factor = NSScreen::main()
+                    let scale_factor = NSScreen::mainScreen(mtm)
                         .map(|screen| screen.backingScaleFactor() as f64)
                         .unwrap_or(1.0);
                     let (width, height) = match attrs.inner_size {
@@ -338,31 +370,31 @@ impl WinitWindow {
                 // if decorations is set to false, ignore pl_attrs
                 //
                 // if the titlebar is hidden, ignore other pl_attrs
-                NSWindowStyleMask::NSBorderlessWindowMask
-                    | NSWindowStyleMask::NSResizableWindowMask
-                    | NSWindowStyleMask::NSMiniaturizableWindowMask
+                NSWindowStyleMaskBorderless
+                    | NSWindowStyleMaskResizable
+                    | NSWindowStyleMaskMiniaturizable
             } else {
                 // default case, resizable window with titlebar and titlebar buttons
-                NSWindowStyleMask::NSClosableWindowMask
-                    | NSWindowStyleMask::NSMiniaturizableWindowMask
-                    | NSWindowStyleMask::NSResizableWindowMask
-                    | NSWindowStyleMask::NSTitledWindowMask
+                NSWindowStyleMaskClosable
+                    | NSWindowStyleMaskMiniaturizable
+                    | NSWindowStyleMaskResizable
+                    | NSWindowStyleMaskTitled
             };
 
             if !attrs.resizable {
-                masks &= !NSWindowStyleMask::NSResizableWindowMask;
+                masks &= !NSWindowStyleMaskResizable;
             }
 
             if !attrs.enabled_buttons.contains(WindowButtons::MINIMIZE) {
-                masks &= !NSWindowStyleMask::NSMiniaturizableWindowMask;
+                masks &= !NSWindowStyleMaskMiniaturizable;
             }
 
             if !attrs.enabled_buttons.contains(WindowButtons::CLOSE) {
-                masks &= !NSWindowStyleMask::NSClosableWindowMask;
+                masks &= !NSWindowStyleMaskClosable;
             }
 
             if pl_attrs.fullsize_content_view {
-                masks |= NSWindowStyleMask::NSFullSizeContentViewWindowMask;
+                masks |= NSWindowStyleMaskFullSizeContentView;
             }
 
             let state = SharedState {
@@ -372,18 +404,23 @@ impl WinitWindow {
                 ..Default::default()
             };
 
-            // Pass the state through FFI to the method declared on the class
-            let state_ptr: *mut c_void = Box::into_raw(Box::new(Mutex::new(state))).cast();
+            let this = mtm.alloc().set_ivars(Mutex::new(state));
             let this: Option<Id<Self>> = unsafe {
                 msg_send_id![
-                    WinitWindow::alloc(),
+                    super(this),
                     initWithContentRect: frame,
                     styleMask: masks,
-                    state: state_ptr,
+                    backing: NSBackingStoreBuffered,
+                    defer: false,
                 ]
             };
             let this = this?;
 
+            // It is very important for correct memory management that we
+            // disable the extra release that would otherwise happen when
+            // calling `close` on the window.
+            unsafe { this.setReleasedWhenClosed(false) };
+
             let resize_increments = match attrs
                 .resize_increments
                 .map(|i| i.to_logical::<f64>(this.scale_factor()))
@@ -401,26 +438,26 @@ impl WinitWindow {
 
             if let Some(identifier) = pl_attrs.tabbing_identifier {
                 this.setTabbingIdentifier(&NSString::from_str(&identifier));
-                this.setTabbingMode(NSWindowTabbingMode::NSWindowTabbingModePreferred);
+                this.setTabbingMode(NSWindowTabbingModePreferred);
             }
 
             if attrs.content_protected {
-                this.setSharingType(NSWindowSharingType::NSWindowSharingNone);
+                this.setSharingType(NSWindowSharingNone);
             }
 
             if pl_attrs.titlebar_transparent {
                 this.setTitlebarAppearsTransparent(true);
             }
             if pl_attrs.title_hidden {
-                this.setTitleVisibility(NSWindowTitleVisibility::Hidden);
+                this.setTitleVisibility(NSWindowTitleHidden);
             }
             if pl_attrs.titlebar_buttons_hidden {
                 for titlebar_button in &[
                     #[allow(deprecated)]
-                    NSWindowButton::FullScreen,
-                    NSWindowButton::Miniaturize,
-                    NSWindowButton::Close,
-                    NSWindowButton::Zoom,
+                    NSWindowFullScreenButton,
+                    NSWindowMiniaturizeButton,
+                    NSWindowCloseButton,
+                    NSWindowZoomButton,
                 ] {
                     if let Some(button) = this.standardWindowButton(*titlebar_button) {
                         button.setHidden(true);
@@ -432,7 +469,7 @@ impl WinitWindow {
             }
 
             if !attrs.enabled_buttons.contains(WindowButtons::MAXIMIZE) {
-                if let Some(button) = this.standardWindowButton(NSWindowButton::Zoom) {
+                if let Some(button) = this.standardWindowButton(NSWindowZoomButton) {
                     button.setEnabled(false);
                 }
             }
@@ -450,25 +487,16 @@ impl WinitWindow {
         })
         .ok_or_else(|| os_error!(OsError::CreationError("Couldn't create `NSWindow`")))?;
 
-        #[cfg(feature = "rwh_06")]
-        match attrs.parent_window.0 {
-            Some(rwh_06::RawWindowHandle::AppKit(handle)) => {
-                // SAFETY: Caller ensures the pointer is valid or NULL
-                // Unwrap is fine, since the pointer comes from `NonNull`.
-                let parent_view: Id<NSView> =
-                    unsafe { Id::retain(handle.ns_view.as_ptr().cast()) }.unwrap();
-                let parent = parent_view.window().ok_or_else(|| {
-                    os_error!(OsError::CreationError(
-                        "parent view should be installed in a window"
-                    ))
-                })?;
+        if let Some(parent_window) = attrs.parent_window {
+            let parent = parent_window.ns_view.get(mtm).window().ok_or_else(|| {
+                os_error!(OsError::CreationError(
+                    "parent view should be installed in a window"
+                ))
+            })?;
 
-                // SAFETY: We know that there are no parent -> child -> parent cycles since the only place in `winit`
-                // where we allow making a window a child window is right here, just after it's been created.
-                unsafe { parent.addChildWindow(&this, NSWindowOrderingMode::NSWindowAbove) };
-            }
-            Some(raw) => panic!("Invalid raw window handle {raw:?} on macOS"),
-            None => (),
+            // SAFETY: We know that there are no parent -> child -> parent cycles since the only place in `winit`
+            // where we allow making a window a child window is right here, just after it's been created.
+            unsafe { parent.addChildWindow_ordered(&this, NSWindowAbove) };
         }
 
         let view = WinitView::new(&this, pl_attrs.accepts_first_mouse);
@@ -476,6 +504,7 @@ impl WinitWindow {
         // The default value of `setWantsBestResolutionOpenGLSurface:` was `false` until
         // macos 10.14 and `true` after 10.15, we should set it to `YES` or `NO` to avoid
         // always the default system value in favour of the user's code
+        #[allow(deprecated)]
         view.setWantsBestResolutionOpenGLSurface(!pl_attrs.disallow_hidpi);
 
         // On Mojave, views automatically become layer-backed shortly after being added to
@@ -483,17 +512,17 @@ impl WinitWindow {
         // the view and its associated OpenGL context. To work around this, on Mojave we
         // explicitly make the view layer-backed up front so that AppKit doesn't do it
         // itself and break the association with its context.
-        if NSAppKitVersion::current().floor() > NSAppKitVersion::NSAppKitVersionNumber10_12 {
+        if unsafe { NSAppKitVersionNumber }.floor() > NSAppKitVersionNumber10_12 {
             view.setWantsLayer(true);
         }
 
         // Configure the new view as the "key view" for the window
-        this.setContentView(&view);
-        this.setInitialFirstResponder(&view);
+        this.setContentView(Some(&view));
+        this.setInitialFirstResponder(Some(&view));
 
         if attrs.transparent {
             this.setOpaque(false);
-            this.setBackgroundColor(&NSColor::clear());
+            this.setBackgroundColor(Some(unsafe { &NSColor::clearColor() }));
         }
 
         if attrs.blur {
@@ -516,13 +545,13 @@ impl WinitWindow {
 
         match attrs.preferred_theme {
             Some(theme) => {
-                set_ns_theme(Some(theme));
+                set_ns_theme(Some(theme), mtm);
                 let mut state = this.lock_shared_state("WinitWindow::new");
                 state.current_theme = Some(theme);
             }
             None => {
                 let mut state = this.lock_shared_state("WinitWindow::new");
-                state.current_theme = Some(get_ns_theme());
+                state.current_theme = Some(get_ns_theme(mtm));
             }
         }
 
@@ -554,9 +583,10 @@ impl WinitWindow {
         Ok((this, delegate))
     }
 
+    #[track_caller]
     pub(super) fn view(&self) -> Id<WinitView> {
         // SAFETY: The view inside WinitWindow is always `WinitView`
-        unsafe { Id::cast(self.contentView()) }
+        unsafe { Id::cast(self.contentView().unwrap()) }
     }
 
     #[track_caller]
@@ -564,14 +594,14 @@ impl WinitWindow {
         &self,
         called_from_fn: &'static str,
     ) -> SharedStateMutexGuard<'_> {
-        SharedStateMutexGuard::new(self.shared_state.lock().unwrap(), called_from_fn)
+        SharedStateMutexGuard::new(self.ivars().lock().unwrap(), called_from_fn)
     }
 
     fn set_style_mask(&self, mask: NSWindowStyleMask) {
         self.setStyleMask(mask);
         // If we don't do this, key handling will break
         // (at least until the window is clicked again/etc.)
-        let _ = self.makeFirstResponder(Some(&self.contentView()));
+        let _ = self.makeFirstResponder(Some(&self.contentView().unwrap()));
     }
 }
 
@@ -592,7 +622,7 @@ impl WinitWindow {
         // NOTE: in general we want to specify the blur radius, but the choice of 80
         // should be a reasonable default.
         let radius = if blur { 80 } else { 0 };
-        let window_number = self.windowNumber();
+        let window_number = unsafe { self.windowNumber() };
         unsafe {
             CGSSetWindowBackgroundBlurRadius(CGSMainConnectionID(), window_number, radius);
         }
@@ -645,7 +675,7 @@ impl WinitWindow {
 
     #[inline]
     pub fn inner_size(&self) -> PhysicalSize<u32> {
-        let frame = self.contentView().frame();
+        let frame = self.contentView().unwrap().frame();
         let logical: LogicalSize<f64> = (frame.size.width as f64, frame.size.height as f64).into();
         let scale_factor = self.scale_factor();
         logical.to_physical(scale_factor)
@@ -767,9 +797,9 @@ impl WinitWindow {
         if !fullscreen {
             let mut mask = self.styleMask();
             if resizable {
-                mask |= NSWindowStyleMask::NSResizableWindowMask;
+                mask |= NSWindowStyleMaskResizable;
             } else {
-                mask &= !NSWindowStyleMask::NSResizableWindowMask;
+                mask &= !NSWindowStyleMaskResizable;
             }
             self.set_style_mask(mask);
         }
@@ -786,15 +816,15 @@ impl WinitWindow {
         let mut mask = self.styleMask();
 
         if buttons.contains(WindowButtons::CLOSE) {
-            mask |= NSWindowStyleMask::NSClosableWindowMask;
+            mask |= NSWindowStyleMaskClosable;
         } else {
-            mask &= !NSWindowStyleMask::NSClosableWindowMask;
+            mask &= !NSWindowStyleMaskClosable;
         }
 
         if buttons.contains(WindowButtons::MINIMIZE) {
-            mask |= NSWindowStyleMask::NSMiniaturizableWindowMask;
+            mask |= NSWindowStyleMaskMiniaturizable;
         } else {
-            mask &= !NSWindowStyleMask::NSMiniaturizableWindowMask;
+            mask &= !NSWindowStyleMaskMiniaturizable;
         }
 
         // This must happen before the button's "enabled" status has been set,
@@ -804,7 +834,7 @@ impl WinitWindow {
         // We edit the button directly instead of using `NSResizableWindowMask`,
         // since that mask also affect the resizability of the window (which is
         // controllable by other means in `winit`).
-        if let Some(button) = self.standardWindowButton(NSWindowButton::Zoom) {
+        if let Some(button) = self.standardWindowButton(NSWindowZoomButton) {
             button.setEnabled(buttons.contains(WindowButtons::MAXIMIZE));
         }
     }
@@ -816,7 +846,7 @@ impl WinitWindow {
             buttons |= WindowButtons::MINIMIZE;
         }
         if self
-            .standardWindowButton(NSWindowButton::Zoom)
+            .standardWindowButton(NSWindowZoomButton)
             .map(|b| b.isEnabled())
             .unwrap_or(true)
         {
@@ -830,7 +860,14 @@ impl WinitWindow {
 
     pub fn set_cursor_icon(&self, icon: CursorIcon) {
         let view = self.view();
-        view.set_cursor_icon(NSCursor::from_icon(icon));
+        view.set_cursor_icon(cursor_from_icon(icon));
+        self.invalidateCursorRectsForView(&view);
+    }
+
+    #[inline]
+    pub(crate) fn set_custom_cursor(&self, cursor: PlatformCustomCursor) {
+        let view = self.view();
+        view.set_cursor_icon(cursor.0.clone());
         self.invalidateCursorRectsForView(&view);
     }
 
@@ -883,8 +920,11 @@ impl WinitWindow {
 
     #[inline]
     pub fn drag_window(&self) -> Result<(), ExternalError> {
-        let event = NSApp().currentEvent();
-        self.performWindowDragWithEvent(event.as_deref());
+        let mtm = MainThreadMarker::from(self);
+        let event = NSApplication::sharedApplication(mtm)
+            .currentEvent()
+            .unwrap();
+        self.performWindowDragWithEvent(&event);
         Ok(())
     }
 
@@ -907,9 +947,8 @@ impl WinitWindow {
         // we make it resizable temporalily.
         let curr_mask = self.styleMask();
 
-        let required =
-            NSWindowStyleMask::NSTitledWindowMask | NSWindowStyleMask::NSResizableWindowMask;
-        let needs_temp_mask = !curr_mask.contains(required);
+        let required = NSWindowStyleMaskTitled | NSWindowStyleMaskResizable;
+        let needs_temp_mask = !mask_contains(curr_mask, required);
         if needs_temp_mask {
             self.set_style_mask(required);
         }
@@ -930,9 +969,9 @@ impl WinitWindow {
             .take()
             .unwrap_or_else(|| self.styleMask());
         if shared_state.resizable {
-            base_mask | NSWindowStyleMask::NSResizableWindowMask
+            base_mask | NSWindowStyleMaskResizable
         } else {
-            base_mask & !NSWindowStyleMask::NSResizableWindowMask
+            base_mask & !NSWindowStyleMaskResizable
         }
     }
 
@@ -963,7 +1002,7 @@ impl WinitWindow {
         if minimized {
             self.miniaturize(Some(self));
         } else {
-            self.deminiaturize(Some(self));
+            unsafe { self.deminiaturize(Some(self)) };
         }
     }
 
@@ -974,6 +1013,7 @@ impl WinitWindow {
 
     #[inline]
     pub fn set_maximized(&self, maximized: bool) {
+        let mtm = MainThreadMarker::from(self);
         let is_zoomed = self.is_zoomed();
         if is_zoomed == maximized {
             return;
@@ -992,17 +1032,14 @@ impl WinitWindow {
             return;
         }
 
-        if self
-            .styleMask()
-            .contains(NSWindowStyleMask::NSResizableWindowMask)
-        {
+        if mask_contains(self.styleMask(), NSWindowStyleMaskResizable) {
             drop(shared_state);
             // Just use the native zoom if resizable
             self.zoom(None);
         } else {
             // if it's not resizable, we set the frame directly
             let new_rect = if maximized {
-                let screen = NSScreen::main().expect("no screen found");
+                let screen = NSScreen::mainScreen(mtm).expect("no screen found");
                 screen.visibleFrame()
             } else {
                 shared_state.saved_standard_frame()
@@ -1025,6 +1062,9 @@ impl WinitWindow {
 
     #[inline]
     pub(crate) fn set_fullscreen(&self, fullscreen: Option<Fullscreen>) {
+        let mtm = MainThreadMarker::from(self);
+        let app = NSApplication::sharedApplication(mtm);
+
         let mut shared_state_lock = self.lock_shared_state("set_fullscreen");
         if shared_state_lock.is_simple_fullscreen {
             return;
@@ -1056,7 +1096,7 @@ impl WinitWindow {
                 }
                 Fullscreen::Exclusive(video_mode) => video_mode.monitor(),
             }
-            .ns_screen()
+            .ns_screen(mtm)
             .unwrap();
 
             let old_screen = self.screen().unwrap();
@@ -1087,7 +1127,6 @@ impl WinitWindow {
             let mut fade_token = ffi::kCGDisplayFadeReservationInvalidToken;
 
             if matches!(old_fullscreen, Some(Fullscreen::Borderless(_))) {
-                let app = NSApp();
                 let mut shared_state_lock = self.lock_shared_state("set_fullscreen");
                 shared_state_lock.save_presentation_opts = Some(app.presentationOptions());
             }
@@ -1145,7 +1184,7 @@ impl WinitWindow {
             // Window level must be restored from `CGShieldingWindowLevel()
             // + 1` back to normal in order for `toggleFullScreen` to do
             // anything
-            window.setLevel(NSWindowLevel::Normal);
+            window.setLevel(kCGNormalWindowLevel as NSWindowLevel);
             window.toggleFullScreen(None);
         }
 
@@ -1155,9 +1194,8 @@ impl WinitWindow {
                 // set a normal style temporarily. The previous state will be
                 // restored in `WindowDelegate::window_did_exit_fullscreen`.
                 let curr_mask = self.styleMask();
-                let required = NSWindowStyleMask::NSTitledWindowMask
-                    | NSWindowStyleMask::NSResizableWindowMask;
-                if !curr_mask.contains(required) {
+                let required = NSWindowStyleMaskTitled | NSWindowStyleMaskResizable;
+                if !mask_contains(curr_mask, required) {
                     self.set_style_mask(required);
                     self.lock_shared_state("set_fullscreen").saved_style = Some(curr_mask);
                 }
@@ -1186,30 +1224,27 @@ impl WinitWindow {
                 // of the menu bar, and this looks broken, so we must make sure
                 // that the menu bar is disabled. This is done in the window
                 // delegate in `window:willUseFullScreenPresentationOptions:`.
-                let app = NSApp();
                 self.lock_shared_state("set_fullscreen")
                     .save_presentation_opts = Some(app.presentationOptions());
 
-                let presentation_options =
-                    NSApplicationPresentationOptions::NSApplicationPresentationFullScreen
-                        | NSApplicationPresentationOptions::NSApplicationPresentationHideDock
-                        | NSApplicationPresentationOptions::NSApplicationPresentationHideMenuBar;
+                let presentation_options = NSApplicationPresentationFullScreen
+                    | NSApplicationPresentationHideDock
+                    | NSApplicationPresentationHideMenuBar;
                 app.setPresentationOptions(presentation_options);
 
-                let window_level =
-                    NSWindowLevel(unsafe { ffi::CGShieldingWindowLevel() } as NSInteger + 1);
+                let window_level = unsafe { ffi::CGShieldingWindowLevel() } as NSWindowLevel + 1;
                 self.setLevel(window_level);
             }
             (Some(Fullscreen::Exclusive(ref video_mode)), Some(Fullscreen::Borderless(_))) => {
                 let presentation_options = self
                     .lock_shared_state("set_fullscreen")
                     .save_presentation_opts
-                    .unwrap_or_else(|| {
-                        NSApplicationPresentationOptions::NSApplicationPresentationFullScreen
-                        | NSApplicationPresentationOptions::NSApplicationPresentationAutoHideDock
-                        | NSApplicationPresentationOptions::NSApplicationPresentationAutoHideMenuBar
-                    });
-                NSApp().setPresentationOptions(presentation_options);
+                    .unwrap_or(
+                        NSApplicationPresentationFullScreen
+                            | NSApplicationPresentationAutoHideDock
+                            | NSApplicationPresentationAutoHideMenuBar,
+                    );
+                app.setPresentationOptions(presentation_options);
 
                 unsafe {
                     ffi::CGRestorePermanentDisplayConfiguration();
@@ -1221,7 +1256,7 @@ impl WinitWindow {
 
                 // Restore the normal window level following the Borderless fullscreen
                 // `CGShieldingWindowLevel() + 1` hack.
-                self.setLevel(NSWindowLevel::Normal);
+                self.setLevel(kCGNormalWindowLevel as NSWindowLevel);
             }
             _ => {}
         };
@@ -1249,15 +1284,15 @@ impl WinitWindow {
 
         let new_mask = {
             let mut new_mask = if decorations {
-                NSWindowStyleMask::NSClosableWindowMask
-                    | NSWindowStyleMask::NSMiniaturizableWindowMask
-                    | NSWindowStyleMask::NSResizableWindowMask
-                    | NSWindowStyleMask::NSTitledWindowMask
+                NSWindowStyleMaskClosable
+                    | NSWindowStyleMaskMiniaturizable
+                    | NSWindowStyleMaskResizable
+                    | NSWindowStyleMaskTitled
             } else {
-                NSWindowStyleMask::NSBorderlessWindowMask | NSWindowStyleMask::NSResizableWindowMask
+                NSWindowStyleMaskBorderless | NSWindowStyleMaskResizable
             };
             if !resizable {
-                new_mask &= !NSWindowStyleMask::NSResizableWindowMask;
+                new_mask &= !NSWindowStyleMaskResizable;
             }
             new_mask
         };
@@ -1272,9 +1307,9 @@ impl WinitWindow {
     #[inline]
     pub fn set_window_level(&self, level: WindowLevel) {
         let level = match level {
-            WindowLevel::AlwaysOnTop => NSWindowLevel::Floating,
-            WindowLevel::AlwaysOnBottom => NSWindowLevel::BELOW_NORMAL,
-            WindowLevel::Normal => NSWindowLevel::Normal,
+            WindowLevel::AlwaysOnTop => kCGFloatingWindowLevel as NSWindowLevel,
+            WindowLevel::AlwaysOnBottom => (kCGNormalWindowLevel - 1) as NSWindowLevel,
+            WindowLevel::Normal => kCGNormalWindowLevel as NSWindowLevel,
         };
         self.setLevel(level);
     }
@@ -1309,30 +1344,33 @@ impl WinitWindow {
 
     #[inline]
     pub fn focus_window(&self) {
+        let mtm = MainThreadMarker::from(self);
         let is_minimized = self.isMiniaturized();
         let is_visible = self.isVisible();
 
         if !is_minimized && is_visible {
-            NSApp().activateIgnoringOtherApps(true);
+            #[allow(deprecated)]
+            NSApplication::sharedApplication(mtm).activateIgnoringOtherApps(true);
             self.makeKeyAndOrderFront(None);
         }
     }
 
     #[inline]
     pub fn request_user_attention(&self, request_type: Option<UserAttentionType>) {
+        let mtm = MainThreadMarker::from(self);
         let ns_request_type = request_type.map(|ty| match ty {
-            UserAttentionType::Critical => NSRequestUserAttentionType::NSCriticalRequest,
-            UserAttentionType::Informational => NSRequestUserAttentionType::NSInformationalRequest,
+            UserAttentionType::Critical => NSCriticalRequest,
+            UserAttentionType::Informational => NSInformationalRequest,
         });
         if let Some(ty) = ns_request_type {
-            NSApp().requestUserAttention(ty);
+            NSApplication::sharedApplication(mtm).requestUserAttention(ty);
         }
     }
 
     #[inline]
     // Allow directly accessing the current monitor internally without unwrapping.
     pub(crate) fn current_monitor_inner(&self) -> Option<MonitorHandle> {
-        let display_id = self.screen()?.display_id();
+        let display_id = get_display_id(&*self.screen()?);
         Some(MonitorHandle::new(display_id))
     }
 
@@ -1357,7 +1395,7 @@ impl WinitWindow {
     pub fn raw_window_handle_rwh_04(&self) -> rwh_04::RawWindowHandle {
         let mut window_handle = rwh_04::AppKitHandle::empty();
         window_handle.ns_window = self as *const Self as *mut _;
-        window_handle.ns_view = Id::as_ptr(&self.contentView()) as *mut _;
+        window_handle.ns_view = Id::as_ptr(&self.contentView().unwrap()) as *mut _;
         rwh_04::RawWindowHandle::AppKit(window_handle)
     }
 
@@ -1366,7 +1404,7 @@ impl WinitWindow {
     pub fn raw_window_handle_rwh_05(&self) -> rwh_05::RawWindowHandle {
         let mut window_handle = rwh_05::AppKitWindowHandle::empty();
         window_handle.ns_window = self as *const Self as *mut _;
-        window_handle.ns_view = Id::as_ptr(&self.contentView()) as *mut _;
+        window_handle.ns_view = Id::as_ptr(&self.contentView().unwrap()) as *mut _;
         rwh_05::RawWindowHandle::AppKit(window_handle)
     }
 
@@ -1378,12 +1416,12 @@ impl WinitWindow {
 
     #[cfg(feature = "rwh_06")]
     #[inline]
-    pub fn raw_window_handle_rwh_06(&self) -> Result<rwh_06::RawWindowHandle, rwh_06::HandleError> {
+    pub fn raw_window_handle_rwh_06(&self) -> rwh_06::RawWindowHandle {
         let window_handle = rwh_06::AppKitWindowHandle::new({
-            let ptr = Id::as_ptr(&self.contentView()) as *mut _;
+            let ptr = Id::as_ptr(&self.contentView().unwrap()) as *mut _;
             std::ptr::NonNull::new(ptr).expect("Id<T> should never be null")
         });
-        Ok(rwh_06::RawWindowHandle::AppKit(window_handle))
+        rwh_06::RawWindowHandle::AppKit(window_handle)
     }
 
     #[cfg(feature = "rwh_06")]
@@ -1416,21 +1454,24 @@ impl WinitWindow {
     }
 
     pub fn set_theme(&self, theme: Option<Theme>) {
-        set_ns_theme(theme);
-        self.lock_shared_state("set_theme").current_theme = theme.or_else(|| Some(get_ns_theme()));
+        let mtm = MainThreadMarker::from(self);
+        set_ns_theme(theme, mtm);
+        self.lock_shared_state("set_theme").current_theme =
+            theme.or_else(|| Some(get_ns_theme(mtm)));
     }
 
     #[inline]
     pub fn set_content_protected(&self, protected: bool) {
         self.setSharingType(if protected {
-            NSWindowSharingType::NSWindowSharingNone
+            NSWindowSharingNone
         } else {
-            NSWindowSharingType::NSWindowSharingReadOnly
+            NSWindowSharingReadOnly
         })
     }
 
     pub fn title(&self) -> String {
-        self.title_().to_string()
+        let window: &NSWindow = self;
+        window.title().to_string()
     }
 
     pub fn reset_dead_keys(&self) {
@@ -1447,9 +1488,10 @@ impl WindowExtMacOS for WinitWindow {
 
     #[inline]
     fn set_simple_fullscreen(&self, fullscreen: bool) -> bool {
+        let mtm = MainThreadMarker::from(self);
         let mut shared_state_lock = self.lock_shared_state("set_simple_fullscreen");
 
-        let app = NSApp();
+        let app = NSApplication::sharedApplication(mtm);
         let is_native_fullscreen = shared_state_lock.fullscreen.is_some();
         let is_simple_fullscreen = shared_state_lock.is_simple_fullscreen;
 
@@ -1477,20 +1519,19 @@ impl WindowExtMacOS for WinitWindow {
 
             // Simulate pre-Lion fullscreen by hiding the dock and menu bar
             let presentation_options =
-                NSApplicationPresentationOptions::NSApplicationPresentationAutoHideDock
-                    | NSApplicationPresentationOptions::NSApplicationPresentationAutoHideMenuBar;
+                NSApplicationPresentationAutoHideDock | NSApplicationPresentationAutoHideMenuBar;
             app.setPresentationOptions(presentation_options);
 
             // Hide the titlebar
-            self.toggle_style_mask(NSWindowStyleMask::NSTitledWindowMask, false);
+            self.toggle_style_mask(NSWindowStyleMaskTitled, false);
 
             // Set the window frame to the screen frame size
             let screen = self.screen().expect("expected screen to be available");
             self.setFrame_display(screen.frame(), true);
 
             // Fullscreen windows can't be resized, minimized, or moved
-            self.toggle_style_mask(NSWindowStyleMask::NSMiniaturizableWindowMask, false);
-            self.toggle_style_mask(NSWindowStyleMask::NSResizableWindowMask, false);
+            self.toggle_style_mask(NSWindowStyleMaskMiniaturizable, false);
+            self.toggle_style_mask(NSWindowStyleMaskResizable, false);
             self.setMovable(false);
 
             true
@@ -1539,24 +1580,20 @@ impl WindowExtMacOS for WinitWindow {
 
     #[inline]
     fn select_next_tab(&self) {
-        if let Some(group) = self.tabGroup() {
-            group.selectNextTab();
-        }
+        self.selectNextTab(None)
     }
 
     #[inline]
     fn select_previous_tab(&self) {
-        if let Some(group) = self.tabGroup() {
-            group.selectPreviousTab()
-        }
+        unsafe { self.selectPreviousTab(None) }
     }
 
     #[inline]
     fn select_tab_at_index(&self, index: usize) {
         if let Some(group) = self.tabGroup() {
-            if let Some(windows) = group.tabbedWindows() {
+            if let Some(windows) = unsafe { self.tabbedWindows() } {
                 if index < windows.len() {
-                    group.setSelectedWindow(&windows[index]);
+                    group.setSelectedWindow(Some(&windows[index]));
                 }
             }
         }
@@ -1564,8 +1601,7 @@ impl WindowExtMacOS for WinitWindow {
 
     #[inline]
     fn num_tabs(&self) -> usize {
-        self.tabGroup()
-            .and_then(|group| group.tabbedWindows())
+        unsafe { self.tabbedWindows() }
             .map(|windows| windows.len())
             .unwrap_or(1)
     }
@@ -1589,25 +1625,31 @@ impl WindowExtMacOS for WinitWindow {
     }
 }
 
-pub(super) fn get_ns_theme() -> Theme {
-    let app = NSApp();
+fn mask_contains(mask: NSWindowStyleMask, value: NSWindowStyleMask) -> bool {
+    mask & value == value
+}
+
+pub(super) fn get_ns_theme(mtm: MainThreadMarker) -> Theme {
+    let app = NSApplication::sharedApplication(mtm);
     let has_theme: bool = unsafe { msg_send![&app, respondsToSelector: sel!(effectiveAppearance)] };
     if !has_theme {
         return Theme::Light;
     }
     let appearance = app.effectiveAppearance();
-    let name = appearance.bestMatchFromAppearancesWithNames(&NSArray::from_id_slice(&[
-        NSString::from_str("NSAppearanceNameAqua"),
-        NSString::from_str("NSAppearanceNameDarkAqua"),
-    ]));
+    let name = appearance
+        .bestMatchFromAppearancesWithNames(&NSArray::from_id_slice(&[
+            NSString::from_str("NSAppearanceNameAqua"),
+            NSString::from_str("NSAppearanceNameDarkAqua"),
+        ]))
+        .unwrap();
     match &*name.to_string() {
         "NSAppearanceNameDarkAqua" => Theme::Dark,
         _ => Theme::Light,
     }
 }
 
-fn set_ns_theme(theme: Option<Theme>) {
-    let app = NSApp();
+fn set_ns_theme(theme: Option<Theme>, mtm: MainThreadMarker) {
+    let app = NSApplication::sharedApplication(mtm);
     let has_theme: bool = unsafe { msg_send![&app, respondsToSelector: sel!(effectiveAppearance)] };
     if has_theme {
         let appearance = theme.map(|t| {
@@ -1615,7 +1657,7 @@ fn set_ns_theme(theme: Option<Theme>) {
                 Theme::Dark => NSString::from_str("NSAppearanceNameDarkAqua"),
                 Theme::Light => NSString::from_str("NSAppearanceNameAqua"),
             };
-            NSAppearance::appearanceNamed(&name)
+            NSAppearance::appearanceNamed(&name).unwrap()
         });
         app.setAppearance(appearance.as_ref().map(|a| a.as_ref()));
     }

src/platform_impl/macos/window_delegate.rs

@@ -1,16 +1,19 @@
 #![allow(clippy::unnecessary_cast)]
 use std::cell::Cell;
-use std::ptr::{self, NonNull};
+use std::ptr;
 
-use icrate::Foundation::{NSArray, NSObject, NSSize, NSString};
-use objc2::declare::{Ivar, IvarDrop};
-use objc2::rc::{autoreleasepool, Id};
-use objc2::runtime::AnyObject;
-use objc2::{class, declare_class, msg_send, msg_send_id, mutability, sel, ClassType};
-
-use super::appkit::{
-    NSApplicationPresentationOptions, NSFilenamesPboardType, NSPasteboard, NSWindowOcclusionState,
+use icrate::AppKit::{
+    NSApplicationPresentationFullScreen, NSApplicationPresentationHideDock,
+    NSApplicationPresentationHideMenuBar, NSApplicationPresentationOptions, NSDraggingDestination,
+    NSFilenamesPboardType, NSPasteboard, NSWindowDelegate, NSWindowOcclusionStateVisible,
 };
+use icrate::Foundation::{MainThreadMarker, NSArray, NSObject, NSObjectProtocol, NSSize, NSString};
+use objc2::rc::{autoreleasepool, Id};
+use objc2::runtime::{AnyObject, ProtocolObject};
+use objc2::{
+    class, declare_class, msg_send, msg_send_id, mutability, sel, ClassType, DeclaredClass,
+};
+
 use super::{
     app_state::AppState,
     util,
@@ -24,7 +27,9 @@ use crate::{
 };
 
 #[derive(Debug)]
-pub struct State {
+pub(crate) struct State {
+    window: Id<WinitWindow>,
+
     // This is set when WindowBuilder::with_fullscreen was set,
     // see comments of `window_did_fail_to_enter_fullscreen`
     initial_fullscreen: Cell<bool>,
@@ -37,72 +42,21 @@ pub struct State {
 }
 
 declare_class!(
-    #[derive(Debug)]
-    pub(crate) struct WinitWindowDelegate {
-        window: IvarDrop<Id<WinitWindow>, "_window">,
-
-        // TODO: It may be possible for delegate methods to be called
-        // asynchronously, causing data races panics?
-        // TODO: Remove unnecessary boxing here
-        state: IvarDrop<Box<State>, "_state">,
-    }
-
-    mod ivars;
+    pub(crate) struct WinitWindowDelegate;
 
     unsafe impl ClassType for WinitWindowDelegate {
         type Super = NSObject;
-        type Mutability = mutability::InteriorMutable;
+        type Mutability = mutability::MainThreadOnly;
         const NAME: &'static str = "WinitWindowDelegate";
     }
 
-    unsafe impl WinitWindowDelegate {
-        #[method(initWithWindow:initialFullscreen:)]
-        unsafe fn init_with_winit(
-            this: *mut Self,
-            window: &WinitWindow,
-            initial_fullscreen: bool,
-        ) -> Option<NonNull<Self>> {
-            let this: Option<&mut Self> = unsafe { msg_send![super(this), init] };
-            this.map(|this| {
-                let scale_factor = window.scale_factor();
-
-                Ivar::write(&mut this.window, window.retain());
-                Ivar::write(
-                    &mut this.state,
-                    Box::new(State {
-                        initial_fullscreen: Cell::new(initial_fullscreen),
-                        previous_position: Cell::new(None),
-                        previous_scale_factor: Cell::new(scale_factor),
-                    }),
-                );
-
-                if scale_factor != 1.0 {
-                    this.queue_static_scale_factor_changed_event();
-                }
-                this.window.setDelegate(Some(this));
-
-                // Enable theme change event
-                let notification_center: Id<AnyObject> =
-                    unsafe { msg_send_id![class!(NSDistributedNotificationCenter), defaultCenter] };
-                let notification_name =
-                    NSString::from_str("AppleInterfaceThemeChangedNotification");
-                let _: () = unsafe {
-                    msg_send![
-                        &notification_center,
-                        addObserver: &*this
-                        selector: sel!(effectiveAppearanceDidChange:)
-                        name: &*notification_name
-                        object: ptr::null::<AnyObject>()
-                    ]
-                };
-
-                NonNull::from(this)
-            })
-        }
+    impl DeclaredClass for WinitWindowDelegate {
+        type Ivars = State;
     }
 
-    // NSWindowDelegate + NSDraggingDestination protocols
-    unsafe impl WinitWindowDelegate {
+    unsafe impl NSObjectProtocol for WinitWindowDelegate {}
+
+    unsafe impl NSWindowDelegate for WinitWindowDelegate {
         #[method(windowShouldClose:)]
         fn window_should_close(&self, _: Option<&AnyObject>) -> bool {
             trace_scope!("windowShouldClose:");
@@ -117,7 +71,7 @@ declare_class!(
             autoreleasepool(|_| {
                 // Since El Capitan, we need to be careful that delegate methods can't
                 // be called after the window closes.
-                self.window.setDelegate(None);
+                self.ivars().window.setDelegate(None);
             });
             self.queue_event(WindowEvent::Destroyed);
         }
@@ -134,16 +88,19 @@ declare_class!(
             trace_scope!("windowWillStartLiveResize:");
 
             let increments = self
+                .ivars()
                 .window
                 .lock_shared_state("window_will_enter_fullscreen")
                 .resize_increments;
-            self.window.set_resize_increments_inner(increments);
+            self.ivars().window.set_resize_increments_inner(increments);
         }
 
         #[method(windowDidEndLiveResize:)]
         fn window_did_end_live_resize(&self, _: Option<&AnyObject>) {
             trace_scope!("windowDidEndLiveResize:");
-            self.window.set_resize_increments_inner(NSSize::new(1., 1.));
+            self.ivars()
+                .window
+                .set_resize_increments_inner(NSSize::new(1., 1.));
         }
 
         // This won't be triggered if the move was part of a resize.
@@ -177,11 +134,183 @@ declare_class!(
             // NSWindowDelegate, and as a result a tracked modifiers state can quite
             // easily fall out of synchrony with reality.  This requires us to emit
             // a synthetic ModifiersChanged event when we lose focus.
-            self.window.view().reset_modifiers();
+            self.ivars().window.view().reset_modifiers();
 
             self.queue_event(WindowEvent::Focused(false));
         }
 
+        /// Invoked when before enter fullscreen
+        #[method(windowWillEnterFullScreen:)]
+        fn window_will_enter_fullscreen(&self, _: Option<&AnyObject>) {
+            trace_scope!("windowWillEnterFullScreen:");
+
+            let mut shared_state = self
+                .ivars()
+                .window
+                .lock_shared_state("window_will_enter_fullscreen");
+            shared_state.maximized = self.ivars().window.is_zoomed();
+            let fullscreen = shared_state.fullscreen.as_ref();
+            match fullscreen {
+                // Exclusive mode sets the state in `set_fullscreen` as the user
+                // can't enter exclusive mode by other means (like the
+                // fullscreen button on the window decorations)
+                Some(Fullscreen::Exclusive(_)) => (),
+                // `window_will_enter_fullscreen` was triggered and we're already
+                // in fullscreen, so we must've reached here by `set_fullscreen`
+                // as it updates the state
+                Some(Fullscreen::Borderless(_)) => (),
+                // Otherwise, we must've reached fullscreen by the user clicking
+                // on the green fullscreen button. Update state!
+                None => {
+                    let current_monitor = self.ivars().window.current_monitor_inner();
+                    shared_state.fullscreen = Some(Fullscreen::Borderless(current_monitor))
+                }
+            }
+            shared_state.in_fullscreen_transition = true;
+        }
+
+        /// Invoked when before exit fullscreen
+        #[method(windowWillExitFullScreen:)]
+        fn window_will_exit_fullscreen(&self, _: Option<&AnyObject>) {
+            trace_scope!("windowWillExitFullScreen:");
+
+            let mut shared_state = self
+                .ivars()
+                .window
+                .lock_shared_state("window_will_exit_fullscreen");
+            shared_state.in_fullscreen_transition = true;
+        }
+
+        #[method(window:willUseFullScreenPresentationOptions:)]
+        fn window_will_use_fullscreen_presentation_options(
+            &self,
+            _: Option<&AnyObject>,
+            proposed_options: NSApplicationPresentationOptions,
+        ) -> NSApplicationPresentationOptions {
+            trace_scope!("window:willUseFullScreenPresentationOptions:");
+            // Generally, games will want to disable the menu bar and the dock. Ideally,
+            // this would be configurable by the user. Unfortunately because of our
+            // `CGShieldingWindowLevel() + 1` hack (see `set_fullscreen`), our window is
+            // placed on top of the menu bar in exclusive fullscreen mode. This looks
+            // broken so we always disable the menu bar in exclusive fullscreen. We may
+            // still want to make this configurable for borderless fullscreen. Right now
+            // we don't, for consistency. If we do, it should be documented that the
+            // user-provided options are ignored in exclusive fullscreen.
+            let mut options = proposed_options;
+            let shared_state = self
+                .ivars()
+                .window
+                .lock_shared_state("window_will_use_fullscreen_presentation_options");
+            if let Some(Fullscreen::Exclusive(_)) = shared_state.fullscreen {
+                options = NSApplicationPresentationFullScreen
+                    | NSApplicationPresentationHideDock
+                    | NSApplicationPresentationHideMenuBar;
+            }
+
+            options
+        }
+
+        /// Invoked when entered fullscreen
+        #[method(windowDidEnterFullScreen:)]
+        fn window_did_enter_fullscreen(&self, _: Option<&AnyObject>) {
+            trace_scope!("windowDidEnterFullScreen:");
+            self.ivars().initial_fullscreen.set(false);
+            let mut shared_state = self
+                .ivars()
+                .window
+                .lock_shared_state("window_did_enter_fullscreen");
+            shared_state.in_fullscreen_transition = false;
+            let target_fullscreen = shared_state.target_fullscreen.take();
+            drop(shared_state);
+            if let Some(target_fullscreen) = target_fullscreen {
+                self.ivars().window.set_fullscreen(target_fullscreen);
+            }
+        }
+
+        /// Invoked when exited fullscreen
+        #[method(windowDidExitFullScreen:)]
+        fn window_did_exit_fullscreen(&self, _: Option<&AnyObject>) {
+            trace_scope!("windowDidExitFullScreen:");
+
+            self.ivars().window.restore_state_from_fullscreen();
+            let mut shared_state = self
+                .ivars()
+                .window
+                .lock_shared_state("window_did_exit_fullscreen");
+            shared_state.in_fullscreen_transition = false;
+            let target_fullscreen = shared_state.target_fullscreen.take();
+            drop(shared_state);
+            if let Some(target_fullscreen) = target_fullscreen {
+                self.ivars().window.set_fullscreen(target_fullscreen);
+            }
+        }
+
+        /// Invoked when fail to enter fullscreen
+        ///
+        /// When this window launch from a fullscreen app (e.g. launch from VS Code
+        /// terminal), it creates a new virtual destkop and a transition animation.
+        /// This animation takes one second and cannot be disable without
+        /// elevated privileges. In this animation time, all toggleFullscreen events
+        /// will be failed. In this implementation, we will try again by using
+        /// performSelector:withObject:afterDelay: until window_did_enter_fullscreen.
+        /// It should be fine as we only do this at initialzation (i.e with_fullscreen
+        /// was set).
+        ///
+        /// From Apple doc:
+        /// In some cases, the transition to enter full-screen mode can fail,
+        /// due to being in the midst of handling some other animation or user gesture.
+        /// This method indicates that there was an error, and you should clean up any
+        /// work you may have done to prepare to enter full-screen mode.
+        #[method(windowDidFailToEnterFullScreen:)]
+        fn window_did_fail_to_enter_fullscreen(&self, _: Option<&AnyObject>) {
+            trace_scope!("windowDidFailToEnterFullScreen:");
+            let mut shared_state = self
+                .ivars()
+                .window
+                .lock_shared_state("window_did_fail_to_enter_fullscreen");
+            shared_state.in_fullscreen_transition = false;
+            shared_state.target_fullscreen = None;
+            if self.ivars().initial_fullscreen.get() {
+                #[allow(clippy::let_unit_value)]
+                unsafe {
+                    let _: () = msg_send![
+                        &*self.ivars().window,
+                        performSelector: sel!(toggleFullScreen:),
+                        withObject: ptr::null::<AnyObject>(),
+                        afterDelay: 0.5,
+                    ];
+                };
+            } else {
+                self.ivars().window.restore_state_from_fullscreen();
+            }
+        }
+
+        // Invoked when the occlusion state of the window changes
+        #[method(windowDidChangeOcclusionState:)]
+        fn window_did_change_occlusion_state(&self, _: Option<&AnyObject>) {
+            trace_scope!("windowDidChangeOcclusionState:");
+            let visible = self.ivars().window.occlusionState() & NSWindowOcclusionStateVisible
+                == NSWindowOcclusionStateVisible;
+            self.queue_event(WindowEvent::Occluded(!visible));
+        }
+
+        #[method(windowDidChangeScreen:)]
+        fn window_did_change_screen(&self, _: Option<&AnyObject>) {
+            trace_scope!("windowDidChangeScreen:");
+            let is_simple_fullscreen = self
+                .ivars()
+                .window
+                .lock_shared_state("window_did_change_screen")
+                .is_simple_fullscreen;
+            if is_simple_fullscreen {
+                if let Some(screen) = self.ivars().window.screen() {
+                    self.ivars().window.setFrame_display(screen.frame(), true);
+                }
+            }
+        }
+    }
+
+    unsafe impl NSDraggingDestination for WinitWindowDelegate {
         /// Invoked when the dragged image enters destination bounds or frame
         #[method(draggingEntered:)]
         fn dragging_entered(&self, sender: &NSObject) -> bool {
@@ -190,7 +319,9 @@ declare_class!(
             use std::path::PathBuf;
 
             let pb: Id<NSPasteboard> = unsafe { msg_send_id![sender, draggingPasteboard] };
-            let filenames = pb.propertyListForType(unsafe { NSFilenamesPboardType });
+            let filenames = pb
+                .propertyListForType(unsafe { NSFilenamesPboardType })
+                .unwrap();
             let filenames: Id<NSArray<NSString>> = unsafe { Id::cast(filenames) };
 
             filenames.into_iter().for_each(|file| {
@@ -216,7 +347,9 @@ declare_class!(
             use std::path::PathBuf;
 
             let pb: Id<NSPasteboard> = unsafe { msg_send_id![sender, draggingPasteboard] };
-            let filenames = pb.propertyListForType(unsafe { NSFilenamesPboardType });
+            let filenames = pb
+                .propertyListForType(unsafe { NSFilenamesPboardType })
+                .unwrap();
             let filenames: Id<NSArray<NSString>> = unsafe { Id::cast(filenames) };
 
             filenames.into_iter().for_each(|file| {
@@ -239,153 +372,9 @@ declare_class!(
             trace_scope!("draggingExited:");
             self.queue_event(WindowEvent::HoveredFileCancelled);
         }
+    }
 
-        /// Invoked when before enter fullscreen
-        #[method(windowWillEnterFullScreen:)]
-        fn window_will_enter_fullscreen(&self, _: Option<&AnyObject>) {
-            trace_scope!("windowWillEnterFullScreen:");
-
-            let mut shared_state = self
-                .window
-                .lock_shared_state("window_will_enter_fullscreen");
-            shared_state.maximized = self.window.is_zoomed();
-            let fullscreen = shared_state.fullscreen.as_ref();
-            match fullscreen {
-                // Exclusive mode sets the state in `set_fullscreen` as the user
-                // can't enter exclusive mode by other means (like the
-                // fullscreen button on the window decorations)
-                Some(Fullscreen::Exclusive(_)) => (),
-                // `window_will_enter_fullscreen` was triggered and we're already
-                // in fullscreen, so we must've reached here by `set_fullscreen`
-                // as it updates the state
-                Some(Fullscreen::Borderless(_)) => (),
-                // Otherwise, we must've reached fullscreen by the user clicking
-                // on the green fullscreen button. Update state!
-                None => {
-                    let current_monitor = self.window.current_monitor_inner();
-                    shared_state.fullscreen = Some(Fullscreen::Borderless(current_monitor))
-                }
-            }
-            shared_state.in_fullscreen_transition = true;
-        }
-
-        /// Invoked when before exit fullscreen
-        #[method(windowWillExitFullScreen:)]
-        fn window_will_exit_fullscreen(&self, _: Option<&AnyObject>) {
-            trace_scope!("windowWillExitFullScreen:");
-
-            let mut shared_state = self.window.lock_shared_state("window_will_exit_fullscreen");
-            shared_state.in_fullscreen_transition = true;
-        }
-
-        #[method(window:willUseFullScreenPresentationOptions:)]
-        fn window_will_use_fullscreen_presentation_options(
-            &self,
-            _: Option<&AnyObject>,
-            proposed_options: NSApplicationPresentationOptions,
-        ) -> NSApplicationPresentationOptions {
-            trace_scope!("window:willUseFullScreenPresentationOptions:");
-            // Generally, games will want to disable the menu bar and the dock. Ideally,
-            // this would be configurable by the user. Unfortunately because of our
-            // `CGShieldingWindowLevel() + 1` hack (see `set_fullscreen`), our window is
-            // placed on top of the menu bar in exclusive fullscreen mode. This looks
-            // broken so we always disable the menu bar in exclusive fullscreen. We may
-            // still want to make this configurable for borderless fullscreen. Right now
-            // we don't, for consistency. If we do, it should be documented that the
-            // user-provided options are ignored in exclusive fullscreen.
-            let mut options = proposed_options;
-            let shared_state = self
-                .window
-                .lock_shared_state("window_will_use_fullscreen_presentation_options");
-            if let Some(Fullscreen::Exclusive(_)) = shared_state.fullscreen {
-                options = NSApplicationPresentationOptions::NSApplicationPresentationFullScreen
-                    | NSApplicationPresentationOptions::NSApplicationPresentationHideDock
-                    | NSApplicationPresentationOptions::NSApplicationPresentationHideMenuBar;
-            }
-
-            options
-        }
-
-        /// Invoked when entered fullscreen
-        #[method(windowDidEnterFullScreen:)]
-        fn window_did_enter_fullscreen(&self, _: Option<&AnyObject>) {
-            trace_scope!("windowDidEnterFullScreen:");
-            self.state.initial_fullscreen.set(false);
-            let mut shared_state = self.window.lock_shared_state("window_did_enter_fullscreen");
-            shared_state.in_fullscreen_transition = false;
-            let target_fullscreen = shared_state.target_fullscreen.take();
-            drop(shared_state);
-            if let Some(target_fullscreen) = target_fullscreen {
-                self.window.set_fullscreen(target_fullscreen);
-            }
-        }
-
-        /// Invoked when exited fullscreen
-        #[method(windowDidExitFullScreen:)]
-        fn window_did_exit_fullscreen(&self, _: Option<&AnyObject>) {
-            trace_scope!("windowDidExitFullScreen:");
-
-            self.window.restore_state_from_fullscreen();
-            let mut shared_state = self.window.lock_shared_state("window_did_exit_fullscreen");
-            shared_state.in_fullscreen_transition = false;
-            let target_fullscreen = shared_state.target_fullscreen.take();
-            drop(shared_state);
-            if let Some(target_fullscreen) = target_fullscreen {
-                self.window.set_fullscreen(target_fullscreen);
-            }
-        }
-
-        /// Invoked when fail to enter fullscreen
-        ///
-        /// When this window launch from a fullscreen app (e.g. launch from VS Code
-        /// terminal), it creates a new virtual destkop and a transition animation.
-        /// This animation takes one second and cannot be disable without
-        /// elevated privileges. In this animation time, all toggleFullscreen events
-        /// will be failed. In this implementation, we will try again by using
-        /// performSelector:withObject:afterDelay: until window_did_enter_fullscreen.
-        /// It should be fine as we only do this at initialzation (i.e with_fullscreen
-        /// was set).
-        ///
-        /// From Apple doc:
-        /// In some cases, the transition to enter full-screen mode can fail,
-        /// due to being in the midst of handling some other animation or user gesture.
-        /// This method indicates that there was an error, and you should clean up any
-        /// work you may have done to prepare to enter full-screen mode.
-        #[method(windowDidFailToEnterFullScreen:)]
-        fn window_did_fail_to_enter_fullscreen(&self, _: Option<&AnyObject>) {
-            trace_scope!("windowDidFailToEnterFullScreen:");
-            let mut shared_state = self
-                .window
-                .lock_shared_state("window_did_fail_to_enter_fullscreen");
-            shared_state.in_fullscreen_transition = false;
-            shared_state.target_fullscreen = None;
-            if self.state.initial_fullscreen.get() {
-                #[allow(clippy::let_unit_value)]
-                unsafe {
-                    let _: () = msg_send![
-                        &*self.window,
-                        performSelector: sel!(toggleFullScreen:),
-                        withObject: ptr::null::<AnyObject>(),
-                        afterDelay: 0.5,
-                    ];
-                };
-            } else {
-                self.window.restore_state_from_fullscreen();
-            }
-        }
-
-        // Invoked when the occlusion state of the window changes
-        #[method(windowDidChangeOcclusionState:)]
-        fn window_did_change_occlusion_state(&self, _: Option<&AnyObject>) {
-            trace_scope!("windowDidChangeOcclusionState:");
-            self.queue_event(WindowEvent::Occluded(
-                !self
-                    .window
-                    .occlusionState()
-                    .contains(NSWindowOcclusionState::NSWindowOcclusionStateVisible),
-            ))
-        }
-
+    unsafe impl WinitWindowDelegate {
         // Observe theme change
         #[method(effectiveAppearanceDidChange:)]
         fn effective_appearance_did_change(&self, sender: Option<&AnyObject>) {
@@ -402,8 +391,10 @@ declare_class!(
 
         #[method(effectiveAppearanceDidChangedOnMainThread:)]
         fn effective_appearance_did_changed_on_main_thread(&self, _: Option<&AnyObject>) {
-            let theme = get_ns_theme();
+            let mtm = MainThreadMarker::from(self);
+            let theme = get_ns_theme(mtm);
             let mut shared_state = self
+                .ivars()
                 .window
                 .lock_shared_state("effective_appearance_did_change");
             let current_theme = shared_state.current_theme;
@@ -413,71 +404,80 @@ declare_class!(
                 self.queue_event(WindowEvent::ThemeChanged(theme));
             }
         }
-
-        #[method(windowDidChangeScreen:)]
-        fn window_did_change_screen(&self, _: Option<&AnyObject>) {
-            trace_scope!("windowDidChangeScreen:");
-            let is_simple_fullscreen = self
-                .window
-                .lock_shared_state("window_did_change_screen")
-                .is_simple_fullscreen;
-            if is_simple_fullscreen {
-                if let Some(screen) = self.window.screen() {
-                    self.window.setFrame_display(screen.frame(), true);
-                }
-            }
-        }
     }
 );
 
 impl WinitWindowDelegate {
     pub fn new(window: &WinitWindow, initial_fullscreen: bool) -> Id<Self> {
-        unsafe {
-            msg_send_id![
-                Self::alloc(),
-                initWithWindow: window,
-                initialFullscreen: initial_fullscreen,
-            ]
+        let mtm = MainThreadMarker::from(window);
+        let scale_factor = window.scale_factor();
+        let this = mtm.alloc().set_ivars(State {
+            window: window.retain(),
+            initial_fullscreen: Cell::new(initial_fullscreen),
+            previous_position: Cell::new(None),
+            previous_scale_factor: Cell::new(scale_factor),
+        });
+        let this: Id<Self> = unsafe { msg_send_id![super(this), init] };
+
+        if scale_factor != 1.0 {
+            this.queue_static_scale_factor_changed_event();
         }
+        window.setDelegate(Some(ProtocolObject::from_ref(&*this)));
+
+        // Enable theme change event
+        let notification_center: Id<AnyObject> =
+            unsafe { msg_send_id![class!(NSDistributedNotificationCenter), defaultCenter] };
+        let notification_name = NSString::from_str("AppleInterfaceThemeChangedNotification");
+        let _: () = unsafe {
+            msg_send![
+                &notification_center,
+                addObserver: &*this
+                selector: sel!(effectiveAppearanceDidChange:)
+                name: &*notification_name
+                object: ptr::null::<AnyObject>()
+            ]
+        };
+
+        this
     }
 
     pub(crate) fn queue_event(&self, event: WindowEvent) {
         let event = Event::WindowEvent {
-            window_id: WindowId(self.window.id()),
+            window_id: WindowId(self.ivars().window.id()),
             event,
         };
         AppState::queue_event(event);
     }
 
     fn queue_static_scale_factor_changed_event(&self) {
-        let scale_factor = self.window.scale_factor();
-        if scale_factor == self.state.previous_scale_factor.get() {
+        let scale_factor = self.ivars().window.scale_factor();
+        if scale_factor == self.ivars().previous_scale_factor.get() {
             return;
         };
 
-        self.state.previous_scale_factor.set(scale_factor);
+        self.ivars().previous_scale_factor.set(scale_factor);
         let suggested_size = self.view_size();
         AppState::queue_static_scale_factor_changed_event(
-            self.window.clone(),
+            self.ivars().window.clone(),
             suggested_size.to_physical(scale_factor),
             scale_factor,
         );
     }
 
     fn emit_move_event(&self) {
-        let rect = self.window.frame();
+        let rect = self.ivars().window.frame();
         let x = rect.origin.x as f64;
         let y = util::bottom_left_to_top_left(rect);
-        if self.state.previous_position.get() != Some((x, y)) {
-            self.state.previous_position.set(Some((x, y)));
-            let scale_factor = self.window.scale_factor();
+        if self.ivars().previous_position.get() != Some((x, y)) {
+            self.ivars().previous_position.set(Some((x, y)));
+            let scale_factor = self.ivars().window.scale_factor();
             let physical_pos = LogicalPosition::<f64>::from((x, y)).to_physical(scale_factor);
             self.queue_event(WindowEvent::Moved(physical_pos));
         }
     }
 
     fn view_size(&self) -> LogicalSize<f64> {
-        let size = self.window.contentView().frame().size;
+        let size = self.ivars().window.contentView().unwrap().frame().size;
         LogicalSize::new(size.width as f64, size.height as f64)
     }
 }

src/platform_impl/orbital/mod.rs

@@ -9,7 +9,7 @@ use crate::dpi::{PhysicalPosition, PhysicalSize};
 pub use self::event_loop::{EventLoop, EventLoopProxy, EventLoopWindowTarget};
 mod event_loop;
 
-pub use self::window::Window;
+pub(crate) use self::window::{OwnedWindowHandle, Window};
 mod window;
 
 struct RedoxSocket {
@@ -193,6 +193,8 @@ impl Display for OsError {
     }
 }
 
+pub(crate) use crate::cursor::NoCustomCursor as PlatformCustomCursor;
+pub(crate) use crate::cursor::NoCustomCursor as PlatformCustomCursorBuilder;
 pub(crate) use crate::icon::NoIcon as PlatformIcon;
 
 #[derive(Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]

src/platform_impl/orbital/window.rs

@@ -12,8 +12,8 @@ use crate::{
 };
 
 use super::{
-    EventLoopWindowTarget, MonitorHandle, PlatformSpecificWindowBuilderAttributes, RedoxSocket,
-    TimeSocket, WindowId, WindowProperties,
+    EventLoopWindowTarget, MonitorHandle, PlatformCustomCursor,
+    PlatformSpecificWindowBuilderAttributes, RedoxSocket, TimeSocket, WindowId, WindowProperties,
 };
 
 // These values match the values uses in the `window_new` function in orbital:
@@ -25,6 +25,18 @@ const ORBITAL_FLAG_BORDERLESS: char = 'l';
 const ORBITAL_FLAG_RESIZABLE: char = 'r';
 const ORBITAL_FLAG_TRANSPARENT: char = 't';
 
+#[derive(Debug, Clone)]
+pub(crate) struct OwnedWindowHandle {}
+
+impl OwnedWindowHandle {
+    #[cfg(feature = "rwh_06")]
+    pub(crate) fn new_parent_window(_handle: rwh_06::WindowHandle<'_>) -> Self {
+        // Parent windows are currently unsupported, though owned window
+        // handles would be implementable.
+        Self {}
+    }
+}
+
 pub struct Window {
     window_socket: Arc<RedoxSocket>,
     redraws: Arc<Mutex<VecDeque<WindowId>>>,
@@ -352,6 +364,8 @@ impl Window {
     #[inline]
     pub fn set_cursor_icon(&self, _: window::CursorIcon) {}
 
+    pub(crate) fn set_custom_cursor(&self, _: PlatformCustomCursor) {}
+
     #[inline]
     pub fn set_cursor_position(&self, _: Position) -> Result<(), error::ExternalError> {
         Err(error::ExternalError::NotSupported(

src/platform_impl/web/async/channel.rs

@@ -6,65 +6,67 @@ use std::sync::mpsc::{self, Receiver, RecvError, SendError, Sender, TryRecvError
 use std::sync::{Arc, Mutex};
 use std::task::Poll;
 
-// NOTE: This channel doesn't wake up when all senders or receivers are
-// dropped. This is acceptable as long as it's only used in `Dispatcher`, which
-// has it's own `Drop` behavior.
-
 pub fn channel<T>() -> (AsyncSender<T>, AsyncReceiver<T>) {
     let (sender, receiver) = mpsc::channel();
-    let sender = Arc::new(Mutex::new(sender));
-    let inner = Arc::new(Inner {
+    let shared = Arc::new(Shared {
         closed: AtomicBool::new(false),
         waker: AtomicWaker::new(),
     });
 
-    let sender = AsyncSender {
-        sender,
-        inner: Arc::clone(&inner),
-    };
+    let sender = AsyncSender(Arc::new(SenderInner {
+        sender: Mutex::new(sender),
+        shared: Arc::clone(&shared),
+    }));
     let receiver = AsyncReceiver {
         receiver: Rc::new(receiver),
-        inner,
+        shared,
     };
 
     (sender, receiver)
 }
 
-pub struct AsyncSender<T> {
+pub struct AsyncSender<T>(Arc<SenderInner<T>>);
+
+struct SenderInner<T> {
     // We need to wrap it into a `Mutex` to make it `Sync`. So the sender can't
     // be accessed on the main thread, as it could block. Additionally we need
-    // to wrap it in an `Arc` to make it clonable on the main thread without
+    // to wrap `Sender` in an `Arc` to make it clonable on the main thread without
     // having to block.
-    sender: Arc<Mutex<Sender<T>>>,
-    inner: Arc<Inner>,
+    sender: Mutex<Sender<T>>,
+    shared: Arc<Shared>,
 }
 
 impl<T> AsyncSender<T> {
     pub fn send(&self, event: T) -> Result<(), SendError<T>> {
-        self.sender.lock().unwrap().send(event)?;
-        self.inner.waker.wake();
+        self.0.sender.lock().unwrap().send(event)?;
+        self.0.shared.waker.wake();
 
         Ok(())
     }
+}
 
-    pub fn close(&self) {
-        self.inner.closed.store(true, Ordering::Relaxed);
-        self.inner.waker.wake()
+impl<T> SenderInner<T> {
+    fn close(&self) {
+        self.shared.closed.store(true, Ordering::Relaxed);
+        self.shared.waker.wake();
     }
 }
 
 impl<T> Clone for AsyncSender<T> {
     fn clone(&self) -> Self {
-        Self {
-            sender: Arc::clone(&self.sender),
-            inner: Arc::clone(&self.inner),
-        }
+        Self(Arc::clone(&self.0))
+    }
+}
+
+impl<T> Drop for SenderInner<T> {
+    fn drop(&mut self) {
+        self.close();
     }
 }
 
 pub struct AsyncReceiver<T> {
     receiver: Rc<Receiver<T>>,
-    inner: Arc<Inner>,
+    shared: Arc<Shared>,
 }
 
 impl<T> AsyncReceiver<T> {
@@ -72,12 +74,12 @@ impl<T> AsyncReceiver<T> {
         future::poll_fn(|cx| match self.receiver.try_recv() {
             Ok(event) => Poll::Ready(Ok(event)),
             Err(TryRecvError::Empty) => {
-                self.inner.waker.register(cx.waker());
+                self.shared.waker.register(cx.waker());
 
                 match self.receiver.try_recv() {
                     Ok(event) => Poll::Ready(Ok(event)),
                     Err(TryRecvError::Empty) => {
-                        if self.inner.closed.load(Ordering::Relaxed) {
+                        if self.shared.closed.load(Ordering::Relaxed) {
                             Poll::Ready(Err(RecvError))
                         } else {
                             Poll::Pending
@@ -104,12 +106,18 @@ impl<T> Clone for AsyncReceiver<T> {
     fn clone(&self) -> Self {
         Self {
             receiver: Rc::clone(&self.receiver),
-            inner: Arc::clone(&self.inner),
+            shared: Arc::clone(&self.shared),
         }
     }
 }
 
-struct Inner {
+impl<T> Drop for AsyncReceiver<T> {
+    fn drop(&mut self) {
+        self.shared.closed.store(true, Ordering::Relaxed);
+    }
+}
+
+struct Shared {
     closed: AtomicBool,
     waker: AtomicWaker,
 }

src/platform_impl/web/async/dispatcher.rs

@@ -82,12 +82,6 @@ impl<T> Dispatcher<T> {
     }
 }
 
-impl<T> Drop for Dispatcher<T> {
-    fn drop(&mut self) {
-        self.0.with_sender_data(|sender| sender.close())
-    }
-}
-
 pub struct DispatchRunner<T: 'static> {
     wrapper: Wrapper<true, T, AsyncSender<Closure<T>>, Closure<T>>,
     receiver: AsyncReceiver<Closure<T>>,

src/platform_impl/web/async/mod.rs

@@ -3,7 +3,7 @@ mod dispatcher;
 mod waker;
 mod wrapper;
 
-use self::channel::{channel, AsyncReceiver, AsyncSender};
+pub use self::channel::{channel, AsyncReceiver, AsyncSender};
 pub use self::dispatcher::{DispatchRunner, Dispatcher};
 pub use self::waker::{Waker, WakerSpawner};
 use self::wrapper::Wrapper;

src/platform_impl/web/cursor.rs

@@ -0,0 +1,579 @@
+use std::{
+    cell::RefCell,
+    future,
+    hash::{Hash, Hasher},
+    mem,
+    ops::DerefMut,
+    rc::{self, Rc},
+    sync::{self, Arc},
+    task::{Poll, Waker},
+};
+
+use crate::{
+    cursor::{BadImage, CursorImage},
+    platform_impl::platform::r#async,
+};
+use cursor_icon::CursorIcon;
+use once_cell::sync::Lazy;
+use wasm_bindgen::{closure::Closure, JsCast};
+use wasm_bindgen_futures::JsFuture;
+use web_sys::{
+    Blob, Document, HtmlCanvasElement, HtmlImageElement, ImageBitmap, ImageBitmapOptions,
+    ImageBitmapRenderingContext, ImageData, PremultiplyAlpha, Url, Window,
+};
+
+use self::thread_safe::ThreadSafe;
+
+use super::{backend::Style, r#async::AsyncSender, EventLoopWindowTarget};
+
+#[derive(Debug)]
+pub(crate) enum CustomCursorBuilder {
+    Image(CursorImage),
+    Url {
+        url: String,
+        hotspot_x: u16,
+        hotspot_y: u16,
+    },
+}
+
+impl CustomCursorBuilder {
+    pub fn from_rgba(
+        rgba: Vec<u8>,
+        width: u16,
+        height: u16,
+        hotspot_x: u16,
+        hotspot_y: u16,
+    ) -> Result<CustomCursorBuilder, BadImage> {
+        Ok(CustomCursorBuilder::Image(CursorImage::from_rgba(
+            rgba, width, height, hotspot_x, hotspot_y,
+        )?))
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct CustomCursor(Arc<Inner>);
+
+impl Hash for CustomCursor {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        Arc::as_ptr(&self.0).hash(state);
+    }
+}
+
+impl PartialEq for CustomCursor {
+    fn eq(&self, other: &Self) -> bool {
+        Arc::ptr_eq(&self.0, &other.0)
+    }
+}
+
+impl Eq for CustomCursor {}
+
+impl CustomCursor {
+    pub(crate) fn build<T>(
+        builder: CustomCursorBuilder,
+        window_target: &EventLoopWindowTarget<T>,
+    ) -> Self {
+        Lazy::force(&DROP_HANDLER);
+
+        Self(match builder {
+            CustomCursorBuilder::Image(image) => ImageState::from_rgba(
+                window_target.runner.window(),
+                window_target.runner.document().clone(),
+                &image,
+            ),
+            CustomCursorBuilder::Url {
+                url,
+                hotspot_x,
+                hotspot_y,
+            } => ImageState::from_url(url, hotspot_x, hotspot_y),
+        })
+    }
+}
+
+#[derive(Debug)]
+struct Inner(Option<ThreadSafe<RefCell<ImageState>>>);
+
+static DROP_HANDLER: Lazy<AsyncSender<ThreadSafe<RefCell<ImageState>>>> = Lazy::new(|| {
+    let (sender, receiver) = r#async::channel();
+    wasm_bindgen_futures::spawn_local(async move { while receiver.next().await.is_ok() {} });
+
+    sender
+});
+
+impl Inner {
+    fn new() -> Arc<Self> {
+        Arc::new(Inner(Some(ThreadSafe::new(RefCell::new(
+            ImageState::Loading(None),
+        )))))
+    }
+
+    fn get(&self) -> &RefCell<ImageState> {
+        self.0
+            .as_ref()
+            .expect("value has accidently already been dropped")
+            .get()
+    }
+}
+
+impl Drop for Inner {
+    fn drop(&mut self) {
+        let value = self
+            .0
+            .take()
+            .expect("value has accidently already been dropped");
+
+        if !value.in_origin_thread() {
+            DROP_HANDLER
+                .send(value)
+                .expect("sender dropped in main thread")
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct CursorState(Rc<RefCell<State>>);
+
+impl CursorState {
+    pub fn new(style: Style) -> Self {
+        Self(Rc::new(RefCell::new(State {
+            style,
+            visible: true,
+            cursor: SelectedCursor::default(),
+        })))
+    }
+
+    pub fn set_cursor_icon(&self, cursor: CursorIcon) {
+        let mut this = self.0.borrow_mut();
+
+        if let SelectedCursor::ImageLoading { state, .. } = &this.cursor {
+            if let ImageState::Loading(state) = state.get().borrow_mut().deref_mut() {
+                state.take();
+            }
+        }
+
+        this.cursor = SelectedCursor::Named(cursor);
+        this.set_style();
+    }
+
+    pub(crate) fn set_custom_cursor(&self, cursor: CustomCursor) {
+        let mut this = self.0.borrow_mut();
+
+        match cursor.0.get().borrow_mut().deref_mut() {
+            ImageState::Loading(state) => {
+                this.cursor = SelectedCursor::ImageLoading {
+                    state: cursor.0.clone(),
+                    previous: mem::take(&mut this.cursor).into(),
+                };
+                *state = Some(Rc::downgrade(&self.0));
+            }
+            ImageState::Failed => log::error!("tried to load invalid cursor"),
+            ImageState::Ready(image) => {
+                this.cursor = SelectedCursor::ImageReady(image.clone());
+                this.set_style();
+            }
+        }
+    }
+
+    pub fn set_cursor_visible(&self, visible: bool) {
+        let mut state = self.0.borrow_mut();
+
+        if !visible && state.visible {
+            state.visible = false;
+            state.style.set("cursor", "none");
+        } else if visible && !state.visible {
+            state.visible = true;
+            state.set_style();
+        }
+    }
+}
+
+#[derive(Debug)]
+struct State {
+    style: Style,
+    visible: bool,
+    cursor: SelectedCursor,
+}
+
+impl State {
+    pub fn set_style(&self) {
+        if self.visible {
+            let value = match &self.cursor {
+                SelectedCursor::Named(icon) => icon.name(),
+                SelectedCursor::ImageLoading { previous, .. } => previous.style(),
+                SelectedCursor::ImageReady(image) => &image.style,
+            };
+
+            self.style.set("cursor", value);
+        }
+    }
+}
+
+#[derive(Debug)]
+enum SelectedCursor {
+    Named(CursorIcon),
+    ImageLoading {
+        state: Arc<Inner>,
+        previous: Previous,
+    },
+    ImageReady(Rc<Image>),
+}
+
+impl Default for SelectedCursor {
+    fn default() -> Self {
+        Self::Named(Default::default())
+    }
+}
+
+impl From<Previous> for SelectedCursor {
+    fn from(previous: Previous) -> Self {
+        match previous {
+            Previous::Named(icon) => Self::Named(icon),
+            Previous::Image(image) => Self::ImageReady(image),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub enum Previous {
+    Named(CursorIcon),
+    Image(Rc<Image>),
+}
+
+impl Previous {
+    fn style(&self) -> &str {
+        match self {
+            Previous::Named(icon) => icon.name(),
+            Previous::Image(image) => &image.style,
+        }
+    }
+}
+
+impl From<SelectedCursor> for Previous {
+    fn from(value: SelectedCursor) -> Self {
+        match value {
+            SelectedCursor::Named(icon) => Self::Named(icon),
+            SelectedCursor::ImageLoading { previous, .. } => previous,
+            SelectedCursor::ImageReady(image) => Self::Image(image),
+        }
+    }
+}
+
+#[derive(Debug)]
+enum ImageState {
+    Loading(Option<rc::Weak<RefCell<State>>>),
+    Failed,
+    Ready(Rc<Image>),
+}
+
+impl ImageState {
+    fn from_rgba(window: &Window, document: Document, image: &CursorImage) -> Arc<Inner> {
+        // 1. Create an `ImageData` from the RGBA data.
+        // 2. Create an `ImageBitmap` from the `ImageData`.
+        // 3. Draw `ImageBitmap` on an `HTMLCanvasElement`.
+        // 4. Create a `Blob` from the `HTMLCanvasElement`.
+        // 5. Create an object URL from the `Blob`.
+        // 6. Decode the image on an `HTMLImageElement` from the URL.
+        // 7. Change the `CursorState` if queued.
+
+        // 1. Create an `ImageData` from the RGBA data.
+        // Adapted from https://github.com/rust-windowing/softbuffer/blob/ab7688e2ed2e2eca51b3c4e1863a5bd7fe85800e/src/web.rs#L196-L223
+        #[cfg(target_feature = "atomics")]
+        // Can't share `SharedArrayBuffer` with `ImageData`.
+        let result = {
+            use js_sys::{Uint8Array, Uint8ClampedArray};
+            use wasm_bindgen::prelude::wasm_bindgen;
+            use wasm_bindgen::JsValue;
+
+            #[wasm_bindgen]
+            extern "C" {
+                #[wasm_bindgen(js_namespace = ImageData)]
+                type ImageDataExt;
+                #[wasm_bindgen(catch, constructor, js_class = ImageData)]
+                fn new(array: Uint8ClampedArray, sw: u32) -> Result<ImageDataExt, JsValue>;
+            }
+
+            let array = Uint8Array::new_with_length(image.rgba.len() as u32);
+            array.copy_from(&image.rgba);
+            let array = Uint8ClampedArray::new(&array);
+            ImageDataExt::new(array, image.width as u32)
+                .map(JsValue::from)
+                .map(ImageData::unchecked_from_js)
+        };
+        #[cfg(not(target_feature = "atomics"))]
+        let result = ImageData::new_with_u8_clamped_array(
+            wasm_bindgen::Clamped(&image.rgba),
+            image.width as u32,
+        );
+        let image_data = result.expect("found wrong image size");
+
+        // 2. Create an `ImageBitmap` from the `ImageData`.
+        //
+        // We call `createImageBitmap()` before spawning the future,
+        // to not have to clone the image buffer.
+        let mut options = ImageBitmapOptions::new();
+        options.premultiply_alpha(PremultiplyAlpha::None);
+        let bitmap = JsFuture::from(
+            window
+                .create_image_bitmap_with_image_data_and_image_bitmap_options(&image_data, &options)
+                .expect("unexpected exception in `createImageBitmap()`"),
+        );
+
+        let this = Inner::new();
+
+        wasm_bindgen_futures::spawn_local({
+            let weak = Arc::downgrade(&this);
+            let CursorImage {
+                width,
+                height,
+                hotspot_x,
+                hotspot_y,
+                ..
+            } = *image;
+            async move {
+                // Keep checking if all references are dropped between every `await` call.
+                if weak.strong_count() == 0 {
+                    return;
+                }
+
+                let bitmap: ImageBitmap = bitmap
+                    .await
+                    .expect("found invalid state in `ImageData`")
+                    .unchecked_into();
+
+                if weak.strong_count() == 0 {
+                    return;
+                }
+
+                let canvas: HtmlCanvasElement = document
+                    .create_element("canvas")
+                    .expect("invalid tag name")
+                    .unchecked_into();
+                #[allow(clippy::disallowed_methods)]
+                canvas.set_width(width as u32);
+                #[allow(clippy::disallowed_methods)]
+                canvas.set_height(height as u32);
+
+                // 3. Draw `ImageBitmap` on an `HTMLCanvasElement`.
+                let context: ImageBitmapRenderingContext = canvas
+                    .get_context("bitmaprenderer")
+                    .expect("unexpected exception in `HTMLCanvasElement.getContext()`")
+                    .expect("`bitmaprenderer` context unsupported")
+                    .unchecked_into();
+                context.transfer_from_image_bitmap(&bitmap);
+
+                // 4. Create a `Blob` from the `HTMLCanvasElement`.
+                //
+                // To keep the `Closure` alive until `HTMLCanvasElement.toBlob()` is done,
+                // we do the whole `Waker` strategy. Commonly on `Drop` the callback is aborted,
+                // but it would increase complexity and isn't possible in this case.
+                // Keep in mind that `HTMLCanvasElement.toBlob()` can call the callback immediately.
+                let value = Rc::new(RefCell::new(None));
+                let waker = Rc::new(RefCell::<Option<Waker>>::new(None));
+                let callback = Closure::once({
+                    let value = value.clone();
+                    let waker = waker.clone();
+                    move |blob: Option<Blob>| {
+                        *value.borrow_mut() = Some(blob);
+                        if let Some(waker) = waker.borrow_mut().take() {
+                            waker.wake();
+                        }
+                    }
+                });
+                canvas
+                    .to_blob(callback.as_ref().unchecked_ref())
+                    .expect("failed with `SecurityError` despite only source coming from memory");
+                let blob = future::poll_fn(|cx| {
+                    if let Some(blob) = value.borrow_mut().take() {
+                        Poll::Ready(blob)
+                    } else {
+                        *waker.borrow_mut() = Some(cx.waker().clone());
+                        Poll::Pending
+                    }
+                })
+                .await;
+
+                let url = {
+                    let Some(this) = weak.upgrade() else {
+                        return;
+                    };
+                    let mut this = this.get().borrow_mut();
+
+                    let Some(blob) = blob else {
+                        log::error!("creating custom cursor failed");
+                        let ImageState::Loading(state) = this.deref_mut() else {
+                            unreachable!("found invalid state");
+                        };
+                        let state = state.take();
+                        *this = ImageState::Failed;
+
+                        if let Some(state) = state.and_then(|weak| weak.upgrade()) {
+                            let mut state = state.borrow_mut();
+                            let SelectedCursor::ImageLoading { previous, .. } =
+                                mem::take(&mut state.cursor)
+                            else {
+                                unreachable!("found invalid state");
+                            };
+                            state.cursor = previous.into();
+                        }
+
+                        return;
+                    };
+
+                    // 5. Create an object URL from the `Blob`.
+                    Url::create_object_url_with_blob(&blob)
+                        .expect("unexpected exception in `URL.createObjectURL()`")
+                };
+
+                Self::decode(weak, url, true, hotspot_x, hotspot_y).await;
+            }
+        });
+
+        this
+    }
+
+    fn from_url(url: String, hotspot_x: u16, hotspot_y: u16) -> Arc<Inner> {
+        let this = Inner::new();
+        wasm_bindgen_futures::spawn_local(Self::decode(
+            Arc::downgrade(&this),
+            url,
+            false,
+            hotspot_x,
+            hotspot_y,
+        ));
+
+        this
+    }
+
+    async fn decode(
+        weak: sync::Weak<Inner>,
+        url: String,
+        object: bool,
+        hotspot_x: u16,
+        hotspot_y: u16,
+    ) {
+        if weak.strong_count() == 0 {
+            return;
+        }
+
+        // 6. Decode the image on an `HTMLImageElement` from the URL.
+        let image =
+            HtmlImageElement::new().expect("unexpected exception in `new HtmlImageElement`");
+        image.set_src(&url);
+        let result = JsFuture::from(image.decode()).await;
+
+        let Some(this) = weak.upgrade() else {
+            return;
+        };
+        let mut this = this.get().borrow_mut();
+
+        let ImageState::Loading(state) = this.deref_mut() else {
+            unreachable!("found invalid state");
+        };
+        let state = state.take();
+
+        if let Err(error) = result {
+            log::error!("creating custom cursor failed: {error:?}");
+            *this = ImageState::Failed;
+
+            if let Some(state) = state.and_then(|weak| weak.upgrade()) {
+                let mut state = state.borrow_mut();
+                let SelectedCursor::ImageLoading { previous, .. } = mem::take(&mut state.cursor)
+                else {
+                    unreachable!("found invalid state");
+                };
+                state.cursor = previous.into();
+            }
+
+            return;
+        }
+
+        let image = Image::new(url, object, image, hotspot_x, hotspot_y);
+
+        // 7. Change the `CursorState` if queued.
+        if let Some(state) = state.and_then(|weak| weak.upgrade()) {
+            let mut state = state.borrow_mut();
+            state.cursor = SelectedCursor::ImageReady(image.clone());
+            state.set_style();
+        }
+
+        *this = ImageState::Ready(image);
+    }
+}
+
+#[derive(Debug)]
+pub struct Image {
+    style: String,
+    url: String,
+    object: bool,
+    _image: HtmlImageElement,
+}
+
+impl Drop for Image {
+    fn drop(&mut self) {
+        if self.object {
+            Url::revoke_object_url(&self.url)
+                .expect("unexpected exception in `URL.revokeObjectURL()`");
+        }
+    }
+}
+
+impl Image {
+    fn new(
+        url: String,
+        object: bool,
+        image: HtmlImageElement,
+        hotspot_x: u16,
+        hotspot_y: u16,
+    ) -> Rc<Self> {
+        let style = format!("url({url}) {hotspot_x} {hotspot_y}, auto");
+
+        Rc::new(Self {
+            style,
+            url,
+            object,
+            _image: image,
+        })
+    }
+}
+
+mod thread_safe {
+    use std::mem;
+    use std::thread::{self, ThreadId};
+
+    #[derive(Debug)]
+    pub struct ThreadSafe<T> {
+        origin_thread: ThreadId,
+        value: T,
+    }
+
+    impl<T> ThreadSafe<T> {
+        pub fn new(value: T) -> Self {
+            Self {
+                origin_thread: thread::current().id(),
+                value,
+            }
+        }
+
+        pub fn get(&self) -> &T {
+            if self.origin_thread == thread::current().id() {
+                &self.value
+            } else {
+                panic!("value not accessible outside its origin thread")
+            }
+        }
+
+        pub fn in_origin_thread(&self) -> bool {
+            self.origin_thread == thread::current().id()
+        }
+    }
+
+    impl<T> Drop for ThreadSafe<T> {
+        fn drop(&mut self) {
+            if mem::needs_drop::<T>() && self.origin_thread != thread::current().id() {
+                panic!("value can't be dropped outside its origin thread")
+            }
+        }
+    }
+
+    unsafe impl<T> Send for ThreadSafe<T> {}
+    unsafe impl<T> Sync for ThreadSafe<T> {}
+}

src/platform_impl/web/event_loop/runner.rs

@@ -67,7 +67,6 @@ pub struct Execution {
     on_key_press: OnEventHandle<KeyboardEvent>,
     on_key_release: OnEventHandle<KeyboardEvent>,
     on_visibility_change: OnEventHandle<web_sys::Event>,
-    on_touch_end: OnEventHandle<web_sys::Event>,
 }
 
 enum RunnerEnum {
@@ -181,7 +180,6 @@ impl Shared {
                 on_key_press: RefCell::new(None),
                 on_key_release: RefCell::new(None),
                 on_visibility_change: RefCell::new(None),
-                on_touch_end: RefCell::new(None),
             }
         }))
     }
@@ -342,8 +340,6 @@ impl Shared {
             self.window().clone(),
             "pointerdown",
             Closure::new(move |event: PointerEvent| {
-                runner.transient_activation();
-
                 if !runner.device_events() {
                     return;
                 }
@@ -367,8 +363,6 @@ impl Shared {
             self.window().clone(),
             "pointerup",
             Closure::new(move |event: PointerEvent| {
-                runner.transient_activation();
-
                 if !runner.device_events() {
                     return;
                 }
@@ -392,8 +386,6 @@ impl Shared {
             self.window().clone(),
             "keydown",
             Closure::new(move |event: KeyboardEvent| {
-                runner.transient_activation();
-
                 if !runner.device_events() {
                     return;
                 }
@@ -452,14 +444,6 @@ impl Shared {
                 }
             }),
         ));
-        let runner = self.clone();
-        *self.0.on_touch_end.borrow_mut() = Some(EventListenerHandle::new(
-            self.window().clone(),
-            "touchend",
-            Closure::new(move |_| {
-                runner.transient_activation();
-            }),
-        ));
     }
 
     // Generate a strictly increasing ID
@@ -788,18 +772,6 @@ impl Shared {
         }
     }
 
-    fn transient_activation(&self) {
-        self.0
-            .all_canvases
-            .borrow()
-            .iter()
-            .for_each(|(_, canvas, _)| {
-                if let Some(canvas) = canvas.upgrade() {
-                    canvas.borrow().transient_activation();
-                }
-            });
-    }
-
     pub fn event_loop_recreation(&self, allow: bool) {
         self.0.event_loop_recreation.set(allow)
     }

src/platform_impl/web/event_loop/window_target.rs

@@ -5,8 +5,6 @@ use std::iter;
 use std::marker::PhantomData;
 use std::rc::{Rc, Weak};
 
-use web_sys::Element;
-
 use super::runner::{EventWrapper, Execution};
 use super::{
     super::{monitor::MonitorHandle, KeyEventExtra},
@@ -85,6 +83,7 @@ impl<T> EventLoopWindowTarget<T> {
     ) {
         let canvas_clone = canvas.clone();
         let mut canvas = canvas.borrow_mut();
+        #[cfg(any(feature = "rwh_04", feature = "rwh_05"))]
         canvas.set_attribute("data-raw-handle", &id.0.to_string());
 
         canvas.on_touch_start(prevent_default);
@@ -124,25 +123,6 @@ impl<T> EventLoopWindowTarget<T> {
             }
         });
 
-        // It is possible that at this point the canvas has
-        // been focused before the callback can be called.
-        let focused = canvas
-            .document()
-            .active_element()
-            .filter(|element| {
-                let canvas: &Element = canvas.raw();
-                element == canvas
-            })
-            .is_some();
-
-        if focused {
-            canvas.has_focus.set(true);
-            self.runner.send_event(Event::WindowEvent {
-                window_id: RootWindowId(id),
-                event: WindowEvent::Focused(true),
-            })
-        }
-
         let runner = self.runner.clone();
         let modifiers = self.modifiers.clone();
         canvas.on_keyboard_press(
@@ -669,8 +649,6 @@ impl<T> EventLoopWindowTarget<T> {
         let runner = self.runner.clone();
         canvas.on_animation_frame(move || runner.request_redraw(RootWindowId(id)));
 
-        canvas.on_touch_end();
-
         canvas.on_context_menu(prevent_default);
     }
 

src/platform_impl/web/mod.rs

@@ -18,6 +18,7 @@
 // compliant way.
 
 mod r#async;
+mod cursor;
 mod device;
 mod error;
 mod event_loop;
@@ -34,8 +35,12 @@ pub(crate) use self::event_loop::{
     EventLoop, EventLoopProxy, EventLoopWindowTarget, PlatformSpecificEventLoopAttributes,
 };
 pub use self::monitor::{MonitorHandle, VideoMode};
-pub use self::window::{PlatformSpecificWindowBuilderAttributes, Window, WindowId};
+pub(crate) use self::window::{
+    OwnedWindowHandle, PlatformSpecificWindowBuilderAttributes, Window, WindowId,
+};
 
 pub(crate) use self::keyboard::KeyEventExtra;
 pub(crate) use crate::icon::NoIcon as PlatformIcon;
 pub(crate) use crate::platform_impl::Fullscreen;
+pub(crate) use cursor::CustomCursor as PlatformCustomCursor;
+pub(crate) use cursor::CustomCursorBuilder as PlatformCustomCursorBuilder;

src/platform_impl/web/web_sys/canvas.rs

@@ -1,5 +1,6 @@
 use std::cell::Cell;
-use std::rc::{Rc, Weak};
+use std::ops::Deref;
+use std::rc::Rc;
 use std::sync::{Arc, Mutex};
 
 use smol_str::SmolStr;
@@ -19,11 +20,10 @@ use crate::window::{WindowAttributes, WindowId as RootWindowId};
 use super::super::WindowId;
 use super::animation_frame::AnimationFrameHandler;
 use super::event_handle::EventListenerHandle;
-use super::fullscreen::FullscreenHandler;
 use super::intersection_handle::IntersectionObserverHandle;
 use super::media_query_handle::MediaQueryListHandle;
 use super::pointer::PointerHandler;
-use super::{event, ButtonsState, ResizeScaleHandle};
+use super::{event, fullscreen, ButtonsState, ResizeScaleHandle};
 
 #[allow(dead_code)]
 pub struct Canvas {
@@ -50,11 +50,17 @@ pub struct Common {
     pub window: web_sys::Window,
     pub document: Document,
     /// Note: resizing the HTMLCanvasElement should go through `backend::set_canvas_size` to ensure the DPI factor is maintained.
-    pub raw: HtmlCanvasElement,
-    style: CssStyleDeclaration,
+    /// Note: this is read-only because we use a pointer to this for [`WindowHandle`](rwh_06::WindowHandle).
+    raw: Rc<HtmlCanvasElement>,
+    style: Style,
     old_size: Rc<Cell<PhysicalSize<u32>>>,
     current_size: Rc<Cell<PhysicalSize<u32>>>,
-    fullscreen_handler: Rc<FullscreenHandler>,
+}
+
+#[derive(Clone, Debug)]
+pub struct Style {
+    read: CssStyleDeclaration,
+    write: CssStyleDeclaration,
 }
 
 impl Canvas {
@@ -92,21 +98,15 @@ impl Canvas {
                 .map_err(|_| os_error!(OsError("Failed to set a tabindex".to_owned())))?;
         }
 
-        #[allow(clippy::disallowed_methods)]
-        let style = window
-            .get_computed_style(&canvas)
-            .expect("Failed to obtain computed style")
-            // this can't fail: we aren't using a pseudo-element
-            .expect("Invalid pseudo-element");
+        let style = Style::new(&window, &canvas);
 
         let common = Common {
             window: window.clone(),
             document: document.clone(),
-            raw: canvas.clone(),
+            raw: Rc::new(canvas.clone()),
             style,
             old_size: Rc::default(),
             current_size: Rc::default(),
-            fullscreen_handler: Rc::new(FullscreenHandler::new(document.clone(), canvas.clone())),
         };
 
         if let Some(size) = attr.inner_size {
@@ -130,7 +130,7 @@ impl Canvas {
         }
 
         if attr.fullscreen.0.is_some() {
-            common.fullscreen_handler.request_fullscreen();
+            fullscreen::request_fullscreen(&document, &canvas);
         }
 
         if attr.active {
@@ -181,9 +181,7 @@ impl Canvas {
             y: bounds.y(),
         };
 
-        if self.document().contains(Some(self.raw()))
-            && self.style().get_property_value("display").unwrap() != "none"
-        {
+        if self.document().contains(Some(self.raw())) && self.style().get("display") != "none" {
             position.x += super::style_size_property(self.style(), "border-left-width")
                 + super::style_size_property(self.style(), "padding-left");
             position.y += super::style_size_property(self.style(), "border-top-width")
@@ -229,7 +227,7 @@ impl Canvas {
     }
 
     #[inline]
-    pub fn style(&self) -> &CssStyleDeclaration {
+    pub fn style(&self) -> &Style {
         &self.common.style
     }
 
@@ -285,7 +283,7 @@ impl Canvas {
     where
         F: 'static + FnMut(PhysicalKey, Key, Option<SmolStr>, KeyLocation, bool, ModifiersState),
     {
-        self.on_keyboard_press = Some(self.common.add_transient_event(
+        self.on_keyboard_press = Some(self.common.add_event(
             "keydown",
             move |event: KeyboardEvent| {
                 if prevent_default {
@@ -445,10 +443,6 @@ impl Canvas {
         self.animation_frame_handler.on_animation_frame(f)
     }
 
-    pub(crate) fn on_touch_end(&mut self) {
-        self.on_touch_end = Some(self.common.add_transient_event("touchend", |_| {}));
-    }
-
     pub(crate) fn on_context_menu(&mut self, prevent_default: bool) {
         self.on_context_menu = Some(self.common.add_event(
             "contextmenu",
@@ -461,15 +455,15 @@ impl Canvas {
     }
 
     pub fn request_fullscreen(&self) {
-        self.common.fullscreen_handler.request_fullscreen()
+        fullscreen::request_fullscreen(self.document(), self.raw());
     }
 
     pub fn exit_fullscreen(&self) {
-        self.common.fullscreen_handler.exit_fullscreen()
+        fullscreen::exit_fullscreen(self.document(), self.raw());
     }
 
     pub fn is_fullscreen(&self) -> bool {
-        self.common.fullscreen_handler.is_fullscreen()
+        fullscreen::is_fullscreen(self.document(), self.raw())
     }
 
     pub fn request_animation_frame(&self) {
@@ -520,10 +514,6 @@ impl Canvas {
         }
     }
 
-    pub(crate) fn transient_activation(&self) {
-        self.common.fullscreen_handler.transient_activation()
-    }
-
     pub fn remove_listeners(&mut self) {
         self.on_touch_start = None;
         self.on_focus = None;
@@ -537,7 +527,6 @@ impl Canvas {
         self.on_intersect = None;
         self.animation_frame_handler.cancel();
         self.on_touch_end = None;
-        self.common.fullscreen_handler.cancel();
         self.on_context_menu = None;
     }
 }
@@ -552,29 +541,44 @@ impl Common {
         E: 'static + AsRef<web_sys::Event> + wasm_bindgen::convert::FromWasmAbi,
         F: 'static + FnMut(E),
     {
-        EventListenerHandle::new(self.raw.clone(), event_name, Closure::new(handler))
+        EventListenerHandle::new(self.raw.deref().clone(), event_name, Closure::new(handler))
     }
 
-    // The difference between add_event and add_user_event is that the latter has a special meaning
-    // for browser security. A user event is a deliberate action by the user (like a mouse or key
-    // press) and is the only time things like a fullscreen request may be successfully completed.)
-    pub fn add_transient_event<E, F>(
-        &self,
-        event_name: &'static str,
-        mut handler: F,
-    ) -> EventListenerHandle<dyn FnMut(E)>
-    where
-        E: 'static + AsRef<web_sys::Event> + wasm_bindgen::convert::FromWasmAbi,
-        F: 'static + FnMut(E),
-    {
-        let fullscreen_handler = Rc::downgrade(&self.fullscreen_handler);
-
-        self.add_event(event_name, move |event: E| {
-            handler(event);
-
-            if let Some(fullscreen_handler) = Weak::upgrade(&fullscreen_handler) {
-                fullscreen_handler.transient_activation()
-            }
-        })
+    pub fn raw(&self) -> &HtmlCanvasElement {
+        &self.raw
+    }
+}
+
+impl Style {
+    fn new(window: &web_sys::Window, canvas: &HtmlCanvasElement) -> Self {
+        #[allow(clippy::disallowed_methods)]
+        let read = window
+            .get_computed_style(canvas)
+            .expect("Failed to obtain computed style")
+            // this can't fail: we aren't using a pseudo-element
+            .expect("Invalid pseudo-element");
+
+        #[allow(clippy::disallowed_methods)]
+        let write = canvas.style();
+
+        Self { read, write }
+    }
+
+    pub(crate) fn get(&self, property: &str) -> String {
+        self.read
+            .get_property_value(property)
+            .expect("Invalid property")
+    }
+
+    pub(crate) fn remove(&self, property: &str) {
+        self.write
+            .remove_property(property)
+            .expect("Property is read only");
+    }
+
+    pub(crate) fn set(&self, property: &str, value: &str) {
+        self.write
+            .set_property(property, value)
+            .expect("Property is read only");
     }
 }

src/platform_impl/web/web_sys/event.rs

@@ -2,8 +2,8 @@ use crate::dpi::LogicalPosition;
 use crate::event::{MouseButton, MouseScrollDelta};
 use crate::keyboard::{Key, KeyLocation, ModifiersState, NamedKey, PhysicalKey};
 
-use once_cell::unsync::OnceCell;
 use smol_str::SmolStr;
+use std::cell::OnceCell;
 use std::convert::TryInto;
 use wasm_bindgen::prelude::wasm_bindgen;
 use wasm_bindgen::{JsCast, JsValue};
@@ -81,22 +81,9 @@ impl MouseButton {
 }
 
 pub fn mouse_position(event: &MouseEvent) -> LogicalPosition<f64> {
-    #[wasm_bindgen]
-    extern "C" {
-        type MouseEventExt;
-
-        #[wasm_bindgen(method, getter, js_name = offsetX)]
-        fn offset_x(this: &MouseEventExt) -> f64;
-
-        #[wasm_bindgen(method, getter, js_name = offsetY)]
-        fn offset_y(this: &MouseEventExt) -> f64;
-    }
-
-    let event: &MouseEventExt = event.unchecked_ref();
-
     LogicalPosition {
-        x: event.offset_x(),
-        y: event.offset_y(),
+        x: event.offset_x() as f64,
+        y: event.offset_y() as f64,
     }
 }
 

src/platform_impl/web/web_sys/fullscreen.rs

@@ -1,145 +1,91 @@
-use std::cell::Cell;
-use std::rc::Rc;
+use std::cell::OnceCell;
 
 use js_sys::Promise;
-use once_cell::unsync::OnceCell;
 use wasm_bindgen::closure::Closure;
 use wasm_bindgen::prelude::wasm_bindgen;
 use wasm_bindgen::{JsCast, JsValue};
 use web_sys::{Document, Element, HtmlCanvasElement};
 
-use super::EventListenerHandle;
+pub fn request_fullscreen(document: &Document, canvas: &HtmlCanvasElement) {
+    if is_fullscreen(document, canvas) {
+        return;
+    }
 
-thread_local! {
-    static FULLSCREEN_API_SUPPORT: OnceCell<bool> = OnceCell::new();
+    #[wasm_bindgen]
+    extern "C" {
+        #[wasm_bindgen(extends = HtmlCanvasElement)]
+        type RequestFullscreen;
+
+        #[wasm_bindgen(method, js_name = requestFullscreen)]
+        fn request_fullscreen(this: &RequestFullscreen) -> Promise;
+
+        #[wasm_bindgen(method, js_name = webkitRequestFullscreen)]
+        fn webkit_request_fullscreen(this: &RequestFullscreen);
+    }
+
+    let canvas: &RequestFullscreen = canvas.unchecked_ref();
+
+    if has_fullscreen_api_support(canvas) {
+        thread_local! {
+            static REJECT_HANDLER: Closure<dyn FnMut(JsValue)> = Closure::new(|_| ());
+        }
+        REJECT_HANDLER.with(|handler| {
+            let _ = canvas.request_fullscreen().catch(handler);
+        });
+    } else {
+        canvas.webkit_request_fullscreen();
+    }
 }
 
-pub struct FullscreenHandler {
-    document: Document,
-    canvas: HtmlCanvasElement,
-    fullscreen_requested: Rc<Cell<bool>>,
-    _fullscreen_change: EventListenerHandle<dyn FnMut()>,
+pub fn is_fullscreen(document: &Document, canvas: &HtmlCanvasElement) -> bool {
+    #[wasm_bindgen]
+    extern "C" {
+        type FullscreenElement;
+
+        #[wasm_bindgen(method, getter, js_name = webkitFullscreenElement)]
+        fn webkit_fullscreen_element(this: &FullscreenElement) -> Option<Element>;
+    }
+
+    let element = if has_fullscreen_api_support(canvas) {
+        #[allow(clippy::disallowed_methods)]
+        document.fullscreen_element()
+    } else {
+        let document: &FullscreenElement = document.unchecked_ref();
+        document.webkit_fullscreen_element()
+    };
+
+    match element {
+        Some(element) => {
+            let canvas: &Element = canvas;
+            canvas == &element
+        }
+        None => false,
+    }
 }
 
-impl FullscreenHandler {
-    pub fn new(document: Document, canvas: HtmlCanvasElement) -> Self {
-        let fullscreen_requested = Rc::new(Cell::new(false));
-        let fullscreen_change = EventListenerHandle::new(
-            canvas.clone(),
-            if has_fullscreen_api_support(&canvas) {
-                "fullscreenchange"
-            } else {
-                "webkitfullscreenchange"
-            },
-            Closure::new({
-                let fullscreen_requested = fullscreen_requested.clone();
-                move || {
-                    // It doesn't matter if the canvas entered or exitted fullscreen mode,
-                    // we don't want to request it again later.
-                    fullscreen_requested.set(false);
-                }
-            }),
-        );
+pub fn exit_fullscreen(document: &Document, canvas: &HtmlCanvasElement) {
+    #[wasm_bindgen]
+    extern "C" {
+        type ExitFullscreen;
 
-        Self {
-            document,
-            canvas,
-            fullscreen_requested,
-            _fullscreen_change: fullscreen_change,
-        }
+        #[wasm_bindgen(method, js_name = webkitExitFullscreen)]
+        fn webkit_exit_fullscreen(this: &ExitFullscreen);
     }
 
-    fn internal_request_fullscreen(&self) {
-        #[wasm_bindgen]
-        extern "C" {
-            type RequestFullscreen;
-
-            #[wasm_bindgen(method, js_name = requestFullscreen)]
-            fn request_fullscreen(this: &RequestFullscreen) -> Promise;
-
-            #[wasm_bindgen(method, js_name = webkitRequestFullscreen)]
-            fn webkit_request_fullscreen(this: &RequestFullscreen);
-        }
-
-        let canvas: &RequestFullscreen = self.canvas.unchecked_ref();
-
-        if has_fullscreen_api_support(&self.canvas) {
-            thread_local! {
-                static REJECT_HANDLER: Closure<dyn FnMut(JsValue)> = Closure::new(|_| ());
-            }
-            REJECT_HANDLER.with(|handler| {
-                let _ = canvas.request_fullscreen().catch(handler);
-            });
-        } else {
-            canvas.webkit_request_fullscreen();
-        }
-    }
-
-    pub fn request_fullscreen(&self) {
-        if !self.is_fullscreen() {
-            self.internal_request_fullscreen();
-            self.fullscreen_requested.set(true);
-        }
-    }
-
-    pub fn transient_activation(&self) {
-        if self.fullscreen_requested.get() {
-            self.internal_request_fullscreen()
-        }
-    }
-
-    pub fn is_fullscreen(&self) -> bool {
-        #[wasm_bindgen]
-        extern "C" {
-            type FullscreenElement;
-
-            #[wasm_bindgen(method, getter, js_name = webkitFullscreenElement)]
-            fn webkit_fullscreen_element(this: &FullscreenElement) -> Option<Element>;
-        }
-
-        let element = if has_fullscreen_api_support(&self.canvas) {
-            #[allow(clippy::disallowed_methods)]
-            self.document.fullscreen_element()
-        } else {
-            let document: &FullscreenElement = self.document.unchecked_ref();
-            document.webkit_fullscreen_element()
-        };
-
-        match element {
-            Some(element) => {
-                let canvas: &Element = &self.canvas;
-                canvas == &element
-            }
-            None => false,
-        }
-    }
-
-    pub fn exit_fullscreen(&self) {
-        #[wasm_bindgen]
-        extern "C" {
-            type ExitFullscreen;
-
-            #[wasm_bindgen(method, js_name = webkitExitFullscreen)]
-            fn webkit_exit_fullscreen(this: &ExitFullscreen);
-        }
-
-        if has_fullscreen_api_support(&self.canvas) {
-            #[allow(clippy::disallowed_methods)]
-            self.document.exit_fullscreen()
-        } else {
-            let document: &ExitFullscreen = self.document.unchecked_ref();
-            document.webkit_exit_fullscreen()
-        }
-
-        self.fullscreen_requested.set(false);
-    }
-
-    pub fn cancel(&self) {
-        self.fullscreen_requested.set(false);
+    if has_fullscreen_api_support(canvas) {
+        #[allow(clippy::disallowed_methods)]
+        document.exit_fullscreen()
+    } else {
+        let document: &ExitFullscreen = document.unchecked_ref();
+        document.webkit_exit_fullscreen()
     }
 }
 
 fn has_fullscreen_api_support(canvas: &HtmlCanvasElement) -> bool {
+    thread_local! {
+        static FULLSCREEN_API_SUPPORT: OnceCell<bool> = OnceCell::new();
+    }
+
     FULLSCREEN_API_SUPPORT.with(|support| {
         *support.get_or_init(|| {
             #[wasm_bindgen]

src/platform_impl/web/web_sys/mod.rs

@@ -10,6 +10,7 @@ mod resize_scaling;
 mod schedule;
 
 pub use self::canvas::Canvas;
+pub use self::canvas::Style;
 pub use self::event::ButtonsState;
 pub use self::event_handle::EventListenerHandle;
 pub use self::resize_scaling::ResizeScaleHandle;
@@ -17,9 +18,7 @@ pub use self::schedule::Schedule;
 
 use crate::dpi::{LogicalPosition, LogicalSize};
 use wasm_bindgen::closure::Closure;
-use web_sys::{
-    CssStyleDeclaration, Document, HtmlCanvasElement, PageTransitionEvent, VisibilityState,
-};
+use web_sys::{Document, HtmlCanvasElement, PageTransitionEvent, VisibilityState};
 
 pub fn throw(msg: &str) {
     wasm_bindgen::throw_str(msg);
@@ -51,8 +50,8 @@ pub fn scale_factor(window: &web_sys::Window) -> f64 {
     window.device_pixel_ratio()
 }
 
-fn fix_canvas_size(style: &CssStyleDeclaration, mut size: LogicalSize<f64>) -> LogicalSize<f64> {
-    if style.get_property_value("box-sizing").unwrap() == "border-box" {
+fn fix_canvas_size(style: &Style, mut size: LogicalSize<f64>) -> LogicalSize<f64> {
+    if style.get("box-sizing") == "border-box" {
         size.width += style_size_property(style, "border-left-width")
             + style_size_property(style, "border-right-width")
             + style_size_property(style, "padding-left")
@@ -69,76 +68,68 @@ fn fix_canvas_size(style: &CssStyleDeclaration, mut size: LogicalSize<f64>) -> L
 pub fn set_canvas_size(
     document: &Document,
     raw: &HtmlCanvasElement,
-    style: &CssStyleDeclaration,
+    style: &Style,
     new_size: LogicalSize<f64>,
 ) {
-    if !document.contains(Some(raw)) || style.get_property_value("display").unwrap() == "none" {
+    if !document.contains(Some(raw)) || style.get("display") == "none" {
         return;
     }
 
     let new_size = fix_canvas_size(style, new_size);
 
-    set_canvas_style_property(raw, "width", &format!("{}px", new_size.width));
-    set_canvas_style_property(raw, "height", &format!("{}px", new_size.height));
+    style.set("width", &format!("{}px", new_size.width));
+    style.set("height", &format!("{}px", new_size.height));
 }
 
 pub fn set_canvas_min_size(
     document: &Document,
     raw: &HtmlCanvasElement,
-    style: &CssStyleDeclaration,
+    style: &Style,
     dimensions: Option<LogicalSize<f64>>,
 ) {
     if let Some(dimensions) = dimensions {
-        if !document.contains(Some(raw)) || style.get_property_value("display").unwrap() == "none" {
+        if !document.contains(Some(raw)) || style.get("display") == "none" {
             return;
         }
 
         let new_size = fix_canvas_size(style, dimensions);
 
-        set_canvas_style_property(raw, "min-width", &format!("{}px", new_size.width));
-        set_canvas_style_property(raw, "min-height", &format!("{}px", new_size.height));
+        style.set("min-width", &format!("{}px", new_size.width));
+        style.set("min-height", &format!("{}px", new_size.height));
     } else {
-        style
-            .remove_property("min-width")
-            .expect("Property is read only");
-        style
-            .remove_property("min-height")
-            .expect("Property is read only");
+        style.remove("min-width");
+        style.remove("min-height");
     }
 }
 
 pub fn set_canvas_max_size(
     document: &Document,
     raw: &HtmlCanvasElement,
-    style: &CssStyleDeclaration,
+    style: &Style,
     dimensions: Option<LogicalSize<f64>>,
 ) {
     if let Some(dimensions) = dimensions {
-        if !document.contains(Some(raw)) || style.get_property_value("display").unwrap() == "none" {
+        if !document.contains(Some(raw)) || style.get("display") == "none" {
             return;
         }
 
         let new_size = fix_canvas_size(style, dimensions);
 
-        set_canvas_style_property(raw, "max-width", &format!("{}px", new_size.width));
-        set_canvas_style_property(raw, "max-height", &format!("{}px", new_size.height));
+        style.set("max-width", &format!("{}px", new_size.width));
+        style.set("max-height", &format!("{}px", new_size.height));
     } else {
-        style
-            .remove_property("max-width")
-            .expect("Property is read only");
-        style
-            .remove_property("max-height")
-            .expect("Property is read only");
+        style.remove("max-width");
+        style.remove("max-height");
     }
 }
 
 pub fn set_canvas_position(
     document: &Document,
     raw: &HtmlCanvasElement,
-    style: &CssStyleDeclaration,
+    style: &Style,
     mut position: LogicalPosition<f64>,
 ) {
-    if document.contains(Some(raw)) && style.get_property_value("display").unwrap() != "none" {
+    if document.contains(Some(raw)) && style.get("display") != "none" {
         position.x -= style_size_property(style, "margin-left")
             + style_size_property(style, "border-left-width")
             + style_size_property(style, "padding-left");
@@ -147,30 +138,21 @@ pub fn set_canvas_position(
             + style_size_property(style, "padding-top");
     }
 
-    set_canvas_style_property(raw, "position", "fixed");
-    set_canvas_style_property(raw, "left", &format!("{}px", position.x));
-    set_canvas_style_property(raw, "top", &format!("{}px", position.y));
+    style.set("position", "fixed");
+    style.set("left", &format!("{}px", position.x));
+    style.set("top", &format!("{}px", position.y));
 }
 
 /// This function will panic if the element is not inserted in the DOM
 /// or is not a CSS property that represents a size in pixel.
-pub fn style_size_property(style: &CssStyleDeclaration, property: &str) -> f64 {
-    let prop = style
-        .get_property_value(property)
-        .expect("Found invalid property");
+pub fn style_size_property(style: &Style, property: &str) -> f64 {
+    let prop = style.get(property);
     prop.strip_suffix("px")
         .expect("Element was not inserted into the DOM or is not a size in pixel")
         .parse()
         .expect("CSS property is not a size in pixel")
 }
 
-pub fn set_canvas_style_property(raw: &HtmlCanvasElement, property: &str, value: &str) {
-    let style = raw.style();
-    style
-        .set_property(property, value)
-        .unwrap_or_else(|err| panic!("error: {err:?}\nFailed to set {property}"))
-}
-
 pub fn is_dark_mode(window: &web_sys::Window) -> Option<bool> {
     window
         .match_media("(prefers-color-scheme: dark)")

src/platform_impl/web/web_sys/pointer.rs

@@ -80,7 +80,7 @@ impl PointerHandler {
         T: 'static + FnMut(ModifiersState, i32, PhysicalPosition<f64>, Force),
     {
         let window = canvas_common.window.clone();
-        self.on_pointer_release = Some(canvas_common.add_transient_event(
+        self.on_pointer_release = Some(canvas_common.add_event(
             "pointerup",
             move |event: PointerEvent| {
                 let modifiers = event::mouse_modifiers(&event);
@@ -117,8 +117,8 @@ impl PointerHandler {
         T: 'static + FnMut(ModifiersState, i32, PhysicalPosition<f64>, Force),
     {
         let window = canvas_common.window.clone();
-        let canvas = canvas_common.raw.clone();
-        self.on_pointer_press = Some(canvas_common.add_transient_event(
+        let canvas = canvas_common.raw().clone();
+        self.on_pointer_press = Some(canvas_common.add_event(
             "pointerdown",
             move |event: PointerEvent| {
                 if prevent_default {
@@ -174,7 +174,7 @@ impl PointerHandler {
         B: 'static + FnMut(ModifiersState, i32, PhysicalPosition<f64>, ButtonsState, MouseButton),
     {
         let window = canvas_common.window.clone();
-        let canvas = canvas_common.raw.clone();
+        let canvas = canvas_common.raw().clone();
         self.on_cursor_move = Some(canvas_common.add_event(
             "pointermove",
             move |event: PointerEvent| {

src/platform_impl/web/web_sys/resize_scaling.rs

@@ -2,14 +2,14 @@ use js_sys::{Array, Object};
 use wasm_bindgen::prelude::{wasm_bindgen, Closure};
 use wasm_bindgen::{JsCast, JsValue};
 use web_sys::{
-    CssStyleDeclaration, Document, HtmlCanvasElement, MediaQueryList, ResizeObserver,
-    ResizeObserverBoxOptions, ResizeObserverEntry, ResizeObserverOptions, ResizeObserverSize,
-    Window,
+    Document, HtmlCanvasElement, MediaQueryList, ResizeObserver, ResizeObserverBoxOptions,
+    ResizeObserverEntry, ResizeObserverOptions, ResizeObserverSize, Window,
 };
 
 use crate::dpi::{LogicalSize, PhysicalSize};
 
 use super::super::backend;
+use super::canvas::Style;
 use super::media_query_handle::MediaQueryListHandle;
 
 use std::cell::{Cell, RefCell};
@@ -22,7 +22,7 @@ impl ResizeScaleHandle {
         window: Window,
         document: Document,
         canvas: HtmlCanvasElement,
-        style: CssStyleDeclaration,
+        style: Style,
         scale_handler: S,
         resize_handler: R,
     ) -> Self
@@ -51,7 +51,7 @@ struct ResizeScaleInternal {
     window: Window,
     document: Document,
     canvas: HtmlCanvasElement,
-    style: CssStyleDeclaration,
+    style: Style,
     mql: MediaQueryListHandle,
     observer: ResizeObserver,
     _observer_closure: Closure<dyn FnMut(Array, ResizeObserver)>,
@@ -65,7 +65,7 @@ impl ResizeScaleInternal {
         window: Window,
         document: Document,
         canvas: HtmlCanvasElement,
-        style: CssStyleDeclaration,
+        style: Style,
         scale_handler: S,
         resize_handler: R,
     ) -> Rc<RefCell<Self>>
@@ -152,9 +152,7 @@ impl ResizeScaleInternal {
     }
 
     fn notify(&mut self) {
-        if !self.document.contains(Some(&self.canvas))
-            || self.style.get_property_value("display").unwrap() == "none"
-        {
+        if !self.document.contains(Some(&self.canvas)) || self.style.get("display") == "none" {
             let size = PhysicalSize::new(0, 0);
 
             if self.notify_scale.replace(false) {
@@ -180,7 +178,7 @@ impl ResizeScaleInternal {
             backend::style_size_property(&self.style, "height"),
         );
 
-        if self.style.get_property_value("box-sizing").unwrap() == "border-box" {
+        if self.style.get("box-sizing") == "border-box" {
             size.width -= backend::style_size_property(&self.style, "border-left-width")
                 + backend::style_size_property(&self.style, "border-right-width")
                 + backend::style_size_property(&self.style, "padding-left")
@@ -246,10 +244,7 @@ impl ResizeScaleInternal {
             .get(0)
             .unchecked_into();
 
-        let writing_mode = self
-            .style
-            .get_property_value("writing-mode")
-            .expect("`writing-mode` is a valid CSS property");
+        let writing_mode = self.style.get("writing-mode");
 
         // means the canvas is not inserted into the DOM
         if writing_mode.is_empty() {

src/platform_impl/web/web_sys/schedule.rs

@@ -1,5 +1,5 @@
 use js_sys::{Function, Object, Promise, Reflect};
-use once_cell::unsync::OnceCell;
+use std::cell::OnceCell;
 use std::time::Duration;
 use wasm_bindgen::closure::Closure;
 use wasm_bindgen::prelude::wasm_bindgen;

src/platform_impl/web/window.rs

@@ -7,15 +7,28 @@ use crate::window::{
 };
 use crate::SendSyncWrapper;
 
-use web_sys::HtmlCanvasElement;
-
+use super::cursor::CursorState;
 use super::r#async::Dispatcher;
+use super::PlatformCustomCursor;
 use super::{backend, monitor::MonitorHandle, EventLoopWindowTarget, Fullscreen};
+use web_sys::HtmlCanvasElement;
 
 use std::cell::RefCell;
 use std::collections::VecDeque;
 use std::rc::Rc;
 
+#[derive(Debug, Clone)]
+pub(crate) struct OwnedWindowHandle {}
+
+impl OwnedWindowHandle {
+    #[cfg(feature = "rwh_06")]
+    pub(crate) fn new_parent_window(_handle: rwh_06::WindowHandle<'_>) -> Self {
+        // Parent windows are currently unsupported, though owned window
+        // handles would be implementable.
+        Self {}
+    }
+}
+
 pub struct Window {
     inner: Dispatcher<Inner>,
 }
@@ -24,7 +37,7 @@ pub struct Inner {
     id: WindowId,
     pub window: web_sys::Window,
     canvas: Rc<RefCell<backend::Canvas>>,
-    previous_pointer: RefCell<&'static str>,
+    cursor: CursorState,
     destroy_fn: Option<Box<dyn FnOnce()>>,
 }
 
@@ -43,6 +56,7 @@ impl Window {
         let canvas =
             backend::Canvas::create(id, window.clone(), document.clone(), &attr, platform_attr)?;
         let canvas = Rc::new(RefCell::new(canvas));
+        let cursor = CursorState::new(canvas.borrow().style().clone());
 
         target.register(&canvas, id, prevent_default);
 
@@ -53,7 +67,7 @@ impl Window {
             id,
             window: window.clone(),
             canvas,
-            previous_pointer: RefCell::new("auto"),
+            cursor,
             destroy_fn: Some(destroy_fn),
         };
 
@@ -82,6 +96,22 @@ impl Window {
             .value()
             .map(|inner| inner.canvas.borrow().raw().clone())
     }
+
+    #[cfg(feature = "rwh_06")]
+    #[inline]
+    pub fn raw_window_handle_rwh_06(&self) -> Result<rwh_06::RawWindowHandle, rwh_06::HandleError> {
+        self.inner
+            .value()
+            .map(|inner| {
+                let canvas = inner.canvas.borrow();
+                // SAFETY: This will only work if the reference to `HtmlCanvasElement` stays valid.
+                let canvas: &wasm_bindgen::JsValue = canvas.raw();
+                let window_handle =
+                    rwh_06::WebCanvasWindowHandle::new(std::ptr::NonNull::from(canvas).cast());
+                rwh_06::RawWindowHandle::WebCanvas(window_handle)
+            })
+            .ok_or(rwh_06::HandleError::Unavailable)
+    }
 }
 
 impl Inner {
@@ -195,8 +225,12 @@ impl Inner {
 
     #[inline]
     pub fn set_cursor_icon(&self, cursor: CursorIcon) {
-        *self.previous_pointer.borrow_mut() = cursor.name();
-        backend::set_canvas_style_property(self.canvas.borrow().raw(), "cursor", cursor.name());
+        self.cursor.set_cursor_icon(cursor)
+    }
+
+    #[inline]
+    pub(crate) fn set_custom_cursor(&self, cursor: PlatformCustomCursor) {
+        self.cursor.set_custom_cursor(cursor)
     }
 
     #[inline]
@@ -222,15 +256,7 @@ impl Inner {
 
     #[inline]
     pub fn set_cursor_visible(&self, visible: bool) {
-        if !visible {
-            backend::set_canvas_style_property(self.canvas.borrow().raw(), "cursor", "none");
-        } else {
-            backend::set_canvas_style_property(
-                self.canvas.borrow().raw(),
-                "cursor",
-                &self.previous_pointer.borrow(),
-            );
-        }
+        self.cursor.set_cursor_visible(visible)
     }
 
     #[inline]
@@ -379,13 +405,6 @@ impl Inner {
         rwh_05::RawDisplayHandle::Web(rwh_05::WebDisplayHandle::empty())
     }
 
-    #[cfg(feature = "rwh_06")]
-    #[inline]
-    pub fn raw_window_handle_rwh_06(&self) -> Result<rwh_06::RawWindowHandle, rwh_06::HandleError> {
-        let window_handle = rwh_06::WebWindowHandle::new(self.id.0);
-        Ok(rwh_06::RawWindowHandle::Web(window_handle))
-    }
-
     #[cfg(feature = "rwh_06")]
     #[inline]
     pub fn raw_display_handle_rwh_06(

src/platform_impl/windows/event_loop.rs

@@ -96,7 +96,7 @@ use runner::{EventLoopRunner, EventLoopRunnerShared};
 
 use self::runner::RunnerState;
 
-use super::window::set_skip_taskbar;
+use super::{window::set_skip_taskbar, SelectedCursor};
 
 pub(crate) struct WindowData<T: 'static> {
     pub window_state: Arc<Mutex<WindowState>>,
@@ -530,10 +530,6 @@ impl<T> EventLoopWindowTarget<T> {
         self.runner_shared.exit_code().is_some()
     }
 
-    pub(crate) fn clear_exit(&self) {
-        self.runner_shared.clear_exit();
-    }
-
     fn exit_code(&self) -> Option<i32> {
         self.runner_shared.exit_code()
     }
@@ -1979,16 +1975,21 @@ unsafe fn public_window_callback_inner<T: 'static>(
                 // `WM_MOUSEMOVE` seems to come after `WM_SETCURSOR` for a given cursor movement.
                 let in_client_area = super::loword(lparam as u32) as u32 == HTCLIENT;
                 if in_client_area {
-                    Some(window_state.mouse.cursor)
+                    Some(window_state.mouse.selected_cursor.clone())
                 } else {
                     None
                 }
             };
 
             match set_cursor_to {
-                Some(cursor) => {
-                    let cursor = unsafe { LoadCursorW(0, util::to_windows_cursor(cursor)) };
-                    unsafe { SetCursor(cursor) };
+                Some(selected_cursor) => {
+                    let hcursor = match selected_cursor {
+                        SelectedCursor::Named(cursor_icon) => unsafe {
+                            LoadCursorW(0, util::to_windows_cursor(cursor_icon))
+                        },
+                        SelectedCursor::Custom(cursor) => cursor.as_raw_handle(),
+                    };
+                    unsafe { SetCursor(hcursor) };
                     result = ProcResult::Value(0);
                 }
                 None => result = ProcResult::DefWindowProc(wparam),

src/platform_impl/windows/event_loop/runner.rs

@@ -163,10 +163,6 @@ impl<T> EventLoopRunner<T> {
         self.exit.get()
     }
 
-    pub fn clear_exit(&self) {
-        self.exit.set(None);
-    }
-
     pub fn should_buffer(&self) -> bool {
         let handler = self.event_handler.take();
         let should_buffer = handler.is_none();

src/platform_impl/windows/icon.rs

@@ -1,18 +1,23 @@
-use std::{fmt, io, mem, path::Path, sync::Arc};
+use std::{ffi::c_void, fmt, io, mem, path::Path, sync::Arc};
 
+use cursor_icon::CursorIcon;
 use windows_sys::{
     core::PCWSTR,
     Win32::{
         Foundation::HWND,
+        Graphics::Gdi::{
+            CreateBitmap, CreateCompatibleBitmap, DeleteObject, GetDC, ReleaseDC, SetBitmapBits,
+        },
         UI::WindowsAndMessaging::{
-            CreateIcon, DestroyIcon, LoadImageW, SendMessageW, HICON, ICON_BIG, ICON_SMALL,
-            IMAGE_ICON, LR_DEFAULTSIZE, LR_LOADFROMFILE, WM_SETICON,
+            CreateIcon, CreateIconIndirect, DestroyCursor, DestroyIcon, LoadImageW, SendMessageW,
+            HCURSOR, HICON, ICONINFO, ICON_BIG, ICON_SMALL, IMAGE_ICON, LR_DEFAULTSIZE,
+            LR_LOADFROMFILE, WM_SETICON,
         },
     },
 };
 
-use crate::dpi::PhysicalSize;
 use crate::icon::*;
+use crate::{cursor::CursorImage, dpi::PhysicalSize};
 
 use super::util;
 
@@ -160,3 +165,92 @@ pub fn unset_for_window(hwnd: HWND, icon_type: IconType) {
         SendMessageW(hwnd, WM_SETICON, icon_type as usize, 0);
     }
 }
+
+#[derive(Debug, Clone)]
+pub enum SelectedCursor {
+    Named(CursorIcon),
+    Custom(WinCursor),
+}
+
+impl Default for SelectedCursor {
+    fn default() -> Self {
+        Self::Named(Default::default())
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct WinCursor {
+    inner: Arc<RaiiCursor>,
+}
+
+impl WinCursor {
+    pub fn as_raw_handle(&self) -> HICON {
+        self.inner.handle
+    }
+
+    fn from_handle(handle: HCURSOR) -> Self {
+        Self {
+            inner: Arc::new(RaiiCursor { handle }),
+        }
+    }
+
+    pub(crate) fn new(image: &CursorImage) -> Result<Self, io::Error> {
+        let mut bgra = image.rgba.clone();
+        bgra.chunks_exact_mut(4).for_each(|chunk| chunk.swap(0, 2));
+
+        let w = image.width as i32;
+        let h = image.height as i32;
+
+        unsafe {
+            let hdc_screen = GetDC(0);
+            if hdc_screen == 0 {
+                return Err(io::Error::last_os_error());
+            }
+            let hbm_color = CreateCompatibleBitmap(hdc_screen, w, h);
+            ReleaseDC(0, hdc_screen);
+            if hbm_color == 0 {
+                return Err(io::Error::last_os_error());
+            }
+            if SetBitmapBits(hbm_color, bgra.len() as u32, bgra.as_ptr() as *const c_void) == 0 {
+                DeleteObject(hbm_color);
+                return Err(io::Error::last_os_error());
+            };
+
+            // Mask created according to https://learn.microsoft.com/en-us/windows/win32/api/wingdi/nf-wingdi-createbitmap#parameters
+            let mask_bits: Vec<u8> = vec![0xff; ((((w + 15) >> 4) << 1) * h) as usize];
+            let hbm_mask = CreateBitmap(w, h, 1, 1, mask_bits.as_ptr() as *const _);
+            if hbm_mask == 0 {
+                DeleteObject(hbm_color);
+                return Err(io::Error::last_os_error());
+            }
+
+            let icon_info = ICONINFO {
+                fIcon: 0,
+                xHotspot: image.hotspot_x as u32,
+                yHotspot: image.hotspot_y as u32,
+                hbmMask: hbm_mask,
+                hbmColor: hbm_color,
+            };
+
+            let handle = CreateIconIndirect(&icon_info as *const _);
+            DeleteObject(hbm_color);
+            DeleteObject(hbm_mask);
+            if handle == 0 {
+                return Err(io::Error::last_os_error());
+            }
+
+            Ok(Self::from_handle(handle))
+        }
+    }
+}
+
+#[derive(Debug)]
+struct RaiiCursor {
+    handle: HCURSOR,
+}
+
+impl Drop for RaiiCursor {
+    fn drop(&mut self) {
+        unsafe { DestroyCursor(self.handle) };
+    }
+}

src/platform_impl/windows/mod.rs

@@ -10,12 +10,14 @@ pub(crate) use self::{
     event_loop::{
         EventLoop, EventLoopProxy, EventLoopWindowTarget, PlatformSpecificEventLoopAttributes,
     },
-    icon::WinIcon,
+    icon::{SelectedCursor, WinIcon},
     monitor::{MonitorHandle, VideoMode},
-    window::Window,
+    window::{OwnedWindowHandle, Window},
 };
 
 pub use self::icon::WinIcon as PlatformIcon;
+pub(crate) use crate::cursor::OnlyCursorImage as PlatformCustomCursor;
+pub(crate) use crate::cursor::OnlyCursorImageBuilder as PlatformCustomCursorBuilder;
 use crate::platform_impl::Fullscreen;
 
 use crate::event::DeviceId as RootDeviceId;

src/platform_impl/windows/window.rs

@@ -66,13 +66,14 @@ use crate::{
         dpi::{dpi_to_scale_factor, enable_non_client_dpi_scaling, hwnd_dpi},
         drop_handler::FileDropHandler,
         event_loop::{self, EventLoopWindowTarget, DESTROY_MSG_ID},
-        icon::{self, IconType},
+        icon::{self, IconType, WinCursor},
         ime::ImeContext,
         keyboard::KeyEventBuilder,
         monitor::{self, MonitorHandle},
         util,
         window_state::{CursorFlags, SavedWindow, WindowFlags, WindowState},
-        Fullscreen, PlatformSpecificWindowBuilderAttributes, WindowId,
+        Fullscreen, PlatformCustomCursor, PlatformSpecificWindowBuilderAttributes, SelectedCursor,
+        WindowId,
     },
     window::{
         CursorGrabMode, CursorIcon, ImePurpose, ResizeDirection, Theme, UserAttentionType,
@@ -80,6 +81,23 @@ use crate::{
     },
 };
 
+#[derive(Debug, Clone)]
+pub(crate) struct OwnedWindowHandle {
+    hwnd: HWND,
+}
+
+impl OwnedWindowHandle {
+    #[cfg(feature = "rwh_06")]
+    pub(crate) fn new_parent_window(handle: rwh_06::WindowHandle<'_>) -> Self {
+        // TODO: Do we need to do something to extend the lifetime of the window handle?
+        let hwnd = match handle.as_raw() {
+            rwh_06::RawWindowHandle::Win32(handle) => handle.hwnd.get() as HWND,
+            handle => panic!("invalid window handle {handle:?} on Windows"),
+        };
+        Self { hwnd }
+    }
+}
+
 /// The Win32 implementation of the main `Window` object.
 pub(crate) struct Window {
     /// Main handle for the window.
@@ -395,13 +413,28 @@ impl Window {
 
     #[inline]
     pub fn set_cursor_icon(&self, cursor: CursorIcon) {
-        self.window_state_lock().mouse.cursor = cursor;
+        self.window_state_lock().mouse.selected_cursor = SelectedCursor::Named(cursor);
         self.thread_executor.execute_in_thread(move || unsafe {
             let cursor = LoadCursorW(0, util::to_windows_cursor(cursor));
             SetCursor(cursor);
         });
     }
 
+    #[inline]
+    pub(crate) fn set_custom_cursor(&self, cursor: PlatformCustomCursor) {
+        let new_cursor = match WinCursor::new(&cursor.0) {
+            Ok(cursor) => cursor,
+            Err(err) => {
+                warn!("Failed to create custom cursor: {err}");
+                return;
+            }
+        };
+        self.window_state_lock().mouse.selected_cursor = SelectedCursor::Custom(new_cursor.clone());
+        self.thread_executor.execute_in_thread(move || unsafe {
+            SetCursor(new_cursor.as_raw_handle());
+        });
+    }
+
     #[inline]
     pub fn set_cursor_grab(&self, mode: CursorGrabMode) -> Result<(), ExternalError> {
         let confine = match mode {
@@ -1285,33 +1318,25 @@ where
     // so the diffing later can work.
     window_flags.set(WindowFlags::CLOSABLE, true);
 
-    let mut fallback_parent = || match pl_attribs.owner {
-        Some(parent) => {
-            window_flags.set(WindowFlags::POPUP, true);
-            Some(parent)
+    let parent = if let Some(parent_window) = &attributes.parent_window {
+        window_flags.set(WindowFlags::CHILD, true);
+        if pl_attribs.menu.is_some() {
+            warn!("Setting a menu on a child window is unsupported");
         }
-        None => {
-            window_flags.set(WindowFlags::ON_TASKBAR, true);
-            None
-        }
-    };
-
-    #[cfg(feature = "rwh_06")]
-    let parent = match attributes.parent_window.0 {
-        Some(rwh_06::RawWindowHandle::Win32(handle)) => {
-            window_flags.set(WindowFlags::CHILD, true);
-            if pl_attribs.menu.is_some() {
-                warn!("Setting a menu on a child window is unsupported");
+        Some(parent_window.hwnd)
+    } else {
+        match pl_attribs.owner {
+            Some(parent) => {
+                window_flags.set(WindowFlags::POPUP, true);
+                Some(parent)
+            }
+            None => {
+                window_flags.set(WindowFlags::ON_TASKBAR, true);
+                None
             }
-            Some(handle.hwnd.get() as HWND)
         }
-        Some(raw) => unreachable!("Invalid raw window handle {raw:?} on Windows"),
-        None => fallback_parent(),
     };
 
-    #[cfg(not(feature = "rwh_06"))]
-    let parent = fallback_parent();
-
     let mut initdata = InitData {
         event_loop,
         attributes,
@@ -1375,7 +1400,7 @@ unsafe fn register_window_class<T: 'static>(class_name: &[u16]) {
     unsafe { RegisterClassExW(&class) };
 }
 
-struct ComInitialized(#[allow(dead_code)] *mut ());
+struct ComInitialized(*mut ());
 impl Drop for ComInitialized {
     fn drop(&mut self) {
         unsafe { CoUninitialize() };