Release 0.27.4 version

During reload we were picking old styles, but the styles could
change during reload leading to errors during IME building.

Fixes #2510.

.github/workflows/ci.yml

@@ -67,14 +67,10 @@ jobs:
         targets: ${{ matrix.platform.target }}
         components: clippy
 
-    - name: Setup NDK path
-      shell: bash
-      # "Temporary" workaround until https://github.com/actions/virtual-environments/issues/5879#issuecomment-1195156618
-      # gets looked into.
-      run: echo "ANDROID_NDK_ROOT=$ANDROID_NDK_LATEST_HOME" >> $GITHUB_ENV
     - name: Install Linux dependencies
       if: (matrix.platform.os == 'ubuntu-latest')
       run: sudo apt-get update && sudo apt-get install pkg-config cmake libfreetype6-dev libfontconfig1-dev
+
     - name: Install GCC Multilib
       if: (matrix.platform.os == 'ubuntu-latest') && contains(matrix.platform.target, 'i686')
       run: sudo dpkg --add-architecture i386 && sudo apt-get update && sudo apt-get install g++-multilib gcc-multilib libfreetype6-dev:i386 libfontconfig1-dev:i386

.github/workflows/publish.yml

@@ -1,18 +0,0 @@
-name: Publish
-
-on:
-  push:
-    tags:
-    - 'v*' # Push events to matching v*, i.e. v1.0, v20.15.10
-
-jobs:
-  Publish:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v2
-    - uses: hecrj/setup-rust-action@v1
-      with:
-        rust-version: stable
-        components: rustfmt
-    - name: Publish to crates.io
-      run: cargo publish --token ${{ secrets.cratesio_token }}

CHANGELOG.md

@@ -8,6 +8,22 @@ And please only add new entries to the top of this list, right below the `# Unre
 
 # Unreleased
 
+# 0.27.4
+
+- On Windows, emit `ReceivedCharacter` events on system keybindings.
+- On Windows, fixed focus event emission on minimize.
+- On X11, fixed IME crashing during reload.
+
+# 0.27.3 (2022-9-10)
+
+- On Windows, added `WindowExtWindows::set_undecorated_shadow` and `WindowBuilderExtWindows::with_undecorated_shadow` to draw the drop shadow behind a borderless window.
+- On Windows, fixed default window features (ie snap, animations, shake, etc.) when decorations are disabled.
+- On Windows, fixed ALT+Space shortcut to open window menu.
+- On Wayland, fixed `Ime::Preedit` not being sent on IME reset.
+- Fixed unbound version specified for `raw-window-handle` leading to compilation failures.
+- Empty `Ime::Preedit` event will be sent before `Ime::Commit` to help clearing preedit.
+- On X11, fixed IME context picking by querying for supported styles beforehand.
+
 # 0.27.2 (2022-8-12)
 
 - On macOS, fixed touch phase reporting when scrolling.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "winit"
-version = "0.27.2"
+version = "0.27.4"
 authors = ["The winit contributors", "Pierre Krieger <pierre.krieger1708@gmail.com>"]
 description = "Cross-platform window creation library."
 edition = "2021"
@@ -47,13 +47,13 @@ once_cell = "1.12"
 log = "0.4"
 serde = { version = "1", optional = true, features = ["serde_derive"] }
 raw_window_handle = { package = "raw-window-handle", version = "0.5" }
-raw_window_handle_04 = { package = "raw-window-handle", version = "0.4" }
+raw_window_handle_04 = { package = "raw-window-handle", version = "0.4.3" }
 bitflags = "1"
 mint = { version = "0.5.6", optional = true }
 
 [dev-dependencies]
 image = { version = "0.24.0", default-features = false, features = ["png"] }
-simple_logger = "2.1.0"
+simple_logger = { version = "2.1.0", default_features = false }
 
 [target.'cfg(target_os = "android")'.dependencies]
 # Coordinate the next winit release with android-ndk-rs: https://github.com/rust-windowing/winit/issues/1995

README.md

@@ -6,7 +6,7 @@
 
 ```toml
 [dependencies]
-winit = "0.27.2"
+winit = "0.27.4"
 ```
 
 ## [Documentation](https://docs.rs/winit)

src/event.rs

@@ -321,6 +321,10 @@ pub enum WindowEvent<'a> {
     Resized(PhysicalSize<u32>),
 
     /// The position of the window has changed. Contains the window's new position.
+    ///
+    /// ## Platform-specific
+    ///
+    /// - **iOS / Android / Web / Wayland:** Unsupported.
     Moved(PhysicalPosition<i32>),
 
     /// The window has been requested to close.
@@ -773,8 +777,9 @@ pub struct KeyboardInput {
 /// the character you want to apply the accent to. This will generate the following event sequence:
 /// ```ignore
 /// // Press "`" key
-/// Ime::Preedit("`", Some(0), Some(0))
+/// Ime::Preedit("`", Some((0, 0)))
 /// // Press "E" key
+/// Ime::Preedit("", None) // Synthetic event generated by winit to clear preedit.
 /// Ime::Commit("é")
 /// ```
 ///
@@ -785,14 +790,15 @@ pub struct KeyboardInput {
 /// sequence could be obtained:
 /// ```ignore
 /// // Press "A" key
-/// Ime::Preedit("a", Some(1), Some(1))
+/// Ime::Preedit("a", Some((1, 1)))
 /// // Press "B" key
-/// Ime::Preedit("a b", Some(3), Some(3))
+/// Ime::Preedit("a b", Some((3, 3)))
 /// // Press left arrow key
-/// Ime::Preedit("a b", Some(1), Some(1))
+/// Ime::Preedit("a b", Some((1, 1)))
 /// // Press space key
-/// Ime::Preedit("啊b", Some(3), Some(3))
+/// Ime::Preedit("啊b", Some((3, 3)))
 /// // Press space key
+/// Ime::Preedit("", None) // Synthetic event generated by winit to clear preedit.
 /// Ime::Commit("啊不")
 /// ```
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
@@ -808,20 +814,21 @@ pub enum Ime {
     /// Notifies when a new composing text should be set at the cursor position.
     ///
     /// The value represents a pair of the preedit string and the cursor begin position and end
-    /// position. When it's `None`, the cursor should be hidden.
+    /// position. When it's `None`, the cursor should be hidden. When `String` is an empty string
+    /// this indicates that preedit was cleared.
     ///
     /// The cursor position is byte-wise indexed.
     Preedit(String, Option<(usize, usize)>),
 
     /// Notifies when text should be inserted into the editor widget.
     ///
-    /// Any pending [`Preedit`](Self::Preedit) must be cleared.
+    /// Right before this event winit will send empty [`Self::Preedit`] event.
     Commit(String),
 
     /// Notifies when the IME was disabled.
     ///
     /// After receiving this event you won't get any more [`Preedit`](Self::Preedit) or
-    /// [`Commit`](Self::Commit) events until the next [`Enabled`](Self::Enabled) event. You can
+    /// [`Commit`](Self::Commit) events until the next [`Enabled`](Self::Enabled) event. You should
     /// also stop issuing IME related requests like [`Window::set_ime_position`] and clear pending
     /// preedit text.
     Disabled,

src/platform/windows.rs

@@ -143,6 +143,11 @@ pub trait WindowExtWindows {
 
     /// Whether to show or hide the window icon in the taskbar.
     fn set_skip_taskbar(&self, skip: bool);
+
+    /// Shows or hides the background drop shadow for undecorated windows.
+    ///
+    /// Enabling the shadow causes a thin 1px line to appear on the top of the window.
+    fn set_undecorated_shadow(&self, shadow: bool);
 }
 
 impl WindowExtWindows for Window {
@@ -175,6 +180,11 @@ impl WindowExtWindows for Window {
     fn set_skip_taskbar(&self, skip: bool) {
         self.window.set_skip_taskbar(skip)
     }
+
+    #[inline]
+    fn set_undecorated_shadow(&self, shadow: bool) {
+        self.window.set_undecorated_shadow(shadow)
+    }
 }
 
 /// Additional methods on `WindowBuilder` that are specific to Windows.
@@ -229,6 +239,12 @@ pub trait WindowBuilderExtWindows {
 
     /// Whether show or hide the window icon in the taskbar.
     fn with_skip_taskbar(self, skip: bool) -> WindowBuilder;
+
+    /// Shows or hides the background drop shadow for undecorated windows.
+    ///
+    /// The shadow is hidden by default.
+    /// Enabling the shadow causes a thin 1px line to appear on the top of the window.
+    fn with_undecorated_shadow(self, shadow: bool) -> WindowBuilder;
 }
 
 impl WindowBuilderExtWindows for WindowBuilder {
@@ -279,6 +295,12 @@ impl WindowBuilderExtWindows for WindowBuilder {
         self.platform_specific.skip_taskbar = skip;
         self
     }
+
+    #[inline]
+    fn with_undecorated_shadow(mut self, shadow: bool) -> WindowBuilder {
+        self.platform_specific.decoration_shadow = shadow;
+        self
+    }
 }
 
 /// Additional methods on `MonitorHandle` that are specific to Windows.

src/platform_impl/ios/event_loop.rs

@@ -7,6 +7,7 @@ use std::{
     sync::mpsc::{self, Receiver, Sender},
 };
 
+use objc::runtime::Object;
 use raw_window_handle::{RawDisplayHandle, UiKitDisplayHandle};
 
 use crate::{
@@ -113,7 +114,7 @@ impl<T: 'static> EventLoop<T> {
         F: 'static + FnMut(Event<'_, T>, &RootEventLoopWindowTarget<T>, &mut ControlFlow),
     {
         unsafe {
-            let application: *mut c_void = msg_send![class!(UIApplication), sharedApplication];
+            let application: *mut Object = msg_send![class!(UIApplication), sharedApplication];
             assert_eq!(
                 application,
                 ptr::null_mut(),

src/platform_impl/ios/ffi.rs

@@ -374,7 +374,7 @@ pub trait NSStringRust: Sized {
 
 impl NSStringRust for id {
     unsafe fn initWithUTF8String_(self, c_string: *const c_char) -> id {
-        msg_send![self, initWithUTF8String: c_string as id]
+        msg_send![self, initWithUTF8String: c_string]
     }
 
     unsafe fn stringByAppendingString_(self, other: id) -> id {

src/platform_impl/ios/monitor.rs

@@ -177,7 +177,7 @@ impl MonitorHandle {
     pub fn retained_new(uiscreen: id) -> MonitorHandle {
         unsafe {
             assert_main_thread!("`MonitorHandle` can only be cloned on the main thread on iOS");
-            let _: () = msg_send![uiscreen, retain];
+            let _: id = msg_send![uiscreen, retain];
         }
         MonitorHandle {
             inner: Inner { uiscreen },

src/platform_impl/ios/view.rs

@@ -262,7 +262,7 @@ unsafe fn get_view_class(root_view_class: &'static Class) -> &'static Class {
                         let scale_factor: CGFloat = msg_send![object, contentScaleFactor];
                         PhysicalPosition::from_logical::<(f64, f64), f64>(
                             (logical_location.x as _, logical_location.y as _),
-                            scale_factor,
+                            scale_factor as f64,
                         )
                     };
                     touch_events.push(EventWrapper::StaticEvent(Event::WindowEvent {

src/platform_impl/ios/window.rs

@@ -411,8 +411,8 @@ impl Window {
 
             let frame = match window_attributes.inner_size {
                 Some(dim) => {
-                    let scale_factor = msg_send![screen, scale];
-                    let size = dim.to_logical::<f64>(scale_factor);
+                    let scale_factor: CGFloat = msg_send![screen, scale];
+                    let size = dim.to_logical::<f64>(scale_factor as f64);
                     CGRect {
                         origin: screen_bounds.origin,
                         size: CGSize {
@@ -427,8 +427,8 @@ impl Window {
             let view = view::create_view(&window_attributes, &platform_attributes, frame);
 
             let gl_or_metal_backed = {
-                let view_class: id = msg_send![view, class];
-                let layer_class: id = msg_send![view_class, layerClass];
+                let view_class: *const Class = msg_send![view, class];
+                let layer_class: *const Class = msg_send![view_class, layerClass];
                 let is_metal: BOOL =
                     msg_send![layer_class, isSubclassOfClass: class!(CAMetalLayer)];
                 let is_gl: BOOL = msg_send![layer_class, isSubclassOfClass: class!(CAEAGLLayer)];

src/platform_impl/linux/wayland/seat/text_input/handlers.rs

@@ -88,18 +88,27 @@ pub(super) fn handle_text_input(
                 _ => return,
             };
 
+            // Clear preedit at the start of `Done`.
+            event_sink.push_window_event(
+                WindowEvent::Ime(Ime::Preedit(String::new(), None)),
+                window_id,
+            );
+
+            // Send `Commit`.
             if let Some(text) = inner.pending_commit.take() {
                 event_sink.push_window_event(WindowEvent::Ime(Ime::Commit(text)), window_id);
             }
 
-            // Push preedit string we've got after latest commit.
+            // Send preedit.
             if let Some(preedit) = inner.pending_preedit.take() {
                 let cursor_range = preedit
                     .cursor_begin
                     .map(|b| (b, preedit.cursor_end.unwrap_or(b)));
 
-                let event = Ime::Preedit(preedit.text, cursor_range);
-                event_sink.push_window_event(WindowEvent::Ime(event), window_id);
+                event_sink.push_window_event(
+                    WindowEvent::Ime(Ime::Preedit(preedit.text, cursor_range)),
+                    window_id,
+                );
             }
         }
         _ => (),

src/platform_impl/linux/x11/event_processor.rs

@@ -614,6 +614,12 @@ impl<T: 'static> EventProcessor<T> {
                     // If we're composing right now, send the string we've got from X11 via
                     // Ime::Commit.
                     if self.is_composing && keycode == 0 && !written.is_empty() {
+                        let event = Event::WindowEvent {
+                            window_id,
+                            event: WindowEvent::Ime(Ime::Preedit(String::new(), None)),
+                        };
+                        callback(event);
+
                         let event = Event::WindowEvent {
                             window_id,
                             event: WindowEvent::Ime(Ime::Commit(written)),

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

@@ -108,17 +108,28 @@ unsafe fn replace_im(inner: *mut ImeInner) -> Result<(), ReplaceImError> {
     let mut new_contexts = HashMap::new();
     for (window, old_context) in (*inner).contexts.iter() {
         let spot = old_context.as_ref().map(|old_context| old_context.ic_spot);
+
+        // Check if the IME was allowed on that context.
         let is_allowed = old_context
             .as_ref()
-            .map(|old_context| old_context.is_allowed)
+            .map(|old_context| old_context.is_allowed())
             .unwrap_or_default();
+
+        // We can't use the style from the old context here, since it may change on reload, so
+        // pick style from the new XIM based on the old state.
+        let style = if is_allowed {
+            new_im.preedit_style
+        } else {
+            new_im.none_style
+        };
+
         let new_context = {
             let result = ImeContext::new(
                 xconn,
                 new_im.im,
+                style,
                 *window,
                 spot,
-                is_allowed,
                 (*inner).event_sender.clone(),
             );
             if result.is_err() {
@@ -132,7 +143,7 @@ unsafe fn replace_im(inner: *mut ImeInner) -> Result<(), ReplaceImError> {
     // If we've made it this far, everything succeeded.
     let _ = (*inner).destroy_all_contexts_if_necessary();
     let _ = (*inner).close_im_if_necessary();
-    (*inner).im = new_im.im;
+    (*inner).im = Some(new_im);
     (*inner).contexts = new_contexts;
     (*inner).is_destroyed = false;
     (*inner).is_fallback = is_fallback;

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

@@ -5,6 +5,7 @@ use std::{mem, ptr};
 
 use x11_dl::xlib::{XIMCallback, XIMPreeditCaretCallbackStruct, XIMPreeditDrawCallbackStruct};
 
+use crate::platform_impl::platform::x11::ime::input_method::{Style, XIMStyle};
 use crate::platform_impl::platform::x11::ime::{ImeEvent, ImeEventSender};
 
 use super::{ffi, util, XConnection, XError};
@@ -191,9 +192,9 @@ struct ImeContextClientData {
 // still exists on the server. Since `ImeInner` has that awareness, destruction must be handled
 // through `ImeInner`.
 pub struct ImeContext {
-    pub(super) ic: ffi::XIC,
-    pub(super) ic_spot: ffi::XPoint,
-    pub(super) is_allowed: bool,
+    pub(crate) ic: ffi::XIC,
+    pub(crate) ic_spot: ffi::XPoint,
+    pub(crate) style: Style,
     // Since the data is passed shared between X11 XIM callbacks, but couldn't be direclty free from
     // there we keep the pointer to automatically deallocate it.
     _client_data: Box<ImeContextClientData>,
@@ -203,9 +204,9 @@ impl ImeContext {
     pub unsafe fn new(
         xconn: &Arc<XConnection>,
         im: ffi::XIM,
+        style: Style,
         window: ffi::Window,
         ic_spot: Option<ffi::XPoint>,
-        is_allowed: bool,
         event_sender: ImeEventSender,
     ) -> Result<Self, ImeContextCreationError> {
         let client_data = Box::into_raw(Box::new(ImeContextClientData {
@@ -215,12 +216,18 @@ impl ImeContext {
             cursor_pos: 0,
         }));
 
-        let ic = if is_allowed {
-            ImeContext::create_ic(xconn, im, window, client_data as ffi::XPointer)
-                .ok_or(ImeContextCreationError::Null)?
-        } else {
-            ImeContext::create_none_ic(xconn, im, window).ok_or(ImeContextCreationError::Null)?
-        };
+        let ic = match style as _ {
+            Style::Preedit(style) => ImeContext::create_preedit_ic(
+                xconn,
+                im,
+                style,
+                window,
+                client_data as ffi::XPointer,
+            ),
+            Style::Nothing(style) => ImeContext::create_nothing_ic(xconn, im, style, window),
+            Style::None(style) => ImeContext::create_none_ic(xconn, im, style, window),
+        }
+        .ok_or(ImeContextCreationError::Null)?;
 
         xconn
             .check_errors()
@@ -229,7 +236,7 @@ impl ImeContext {
         let mut context = ImeContext {
             ic,
             ic_spot: ffi::XPoint { x: 0, y: 0 },
-            is_allowed,
+            style,
             _client_data: Box::from_raw(client_data),
         };
 
@@ -244,12 +251,13 @@ impl ImeContext {
     unsafe fn create_none_ic(
         xconn: &Arc<XConnection>,
         im: ffi::XIM,
+        style: XIMStyle,
         window: ffi::Window,
     ) -> Option<ffi::XIC> {
         let ic = (xconn.xlib.XCreateIC)(
             im,
             ffi::XNInputStyle_0.as_ptr() as *const _,
-            ffi::XIMPreeditNone | ffi::XIMStatusNone,
+            style,
             ffi::XNClientWindow_0.as_ptr() as *const _,
             window,
             ptr::null_mut::<()>(),
@@ -258,9 +266,10 @@ impl ImeContext {
         (!ic.is_null()).then(|| ic)
     }
 
-    unsafe fn create_ic(
+    unsafe fn create_preedit_ic(
         xconn: &Arc<XConnection>,
         im: ffi::XIM,
+        style: XIMStyle,
         window: ffi::Window,
         client_data: ffi::XPointer,
     ) -> Option<ffi::XIC> {
@@ -282,32 +291,34 @@ impl ImeContext {
         )
         .expect("XVaCreateNestedList returned NULL");
 
-        let ic = {
-            let ic = (xconn.xlib.XCreateIC)(
-                im,
-                ffi::XNInputStyle_0.as_ptr() as *const _,
-                ffi::XIMPreeditCallbacks | ffi::XIMStatusNothing,
-                ffi::XNClientWindow_0.as_ptr() as *const _,
-                window,
-                ffi::XNPreeditAttributes_0.as_ptr() as *const _,
-                preedit_attr.ptr,
-                ptr::null_mut::<()>(),
-            );
+        let ic = (xconn.xlib.XCreateIC)(
+            im,
+            ffi::XNInputStyle_0.as_ptr() as *const _,
+            style,
+            ffi::XNClientWindow_0.as_ptr() as *const _,
+            window,
+            ffi::XNPreeditAttributes_0.as_ptr() as *const _,
+            preedit_attr.ptr,
+            ptr::null_mut::<()>(),
+        );
 
-            // If we've failed to create IC with preedit callbacks fallback to normal one.
-            if ic.is_null() {
-                (xconn.xlib.XCreateIC)(
-                    im,
-                    ffi::XNInputStyle_0.as_ptr() as *const _,
-                    ffi::XIMPreeditNothing | ffi::XIMStatusNothing,
-                    ffi::XNClientWindow_0.as_ptr() as *const _,
-                    window,
-                    ptr::null_mut::<()>(),
-                )
-            } else {
-                ic
-            }
-        };
+        (!ic.is_null()).then(|| ic)
+    }
+
+    unsafe fn create_nothing_ic(
+        xconn: &Arc<XConnection>,
+        im: ffi::XIM,
+        style: XIMStyle,
+        window: ffi::Window,
+    ) -> Option<ffi::XIC> {
+        let ic = (xconn.xlib.XCreateIC)(
+            im,
+            ffi::XNInputStyle_0.as_ptr() as *const _,
+            style,
+            ffi::XNClientWindow_0.as_ptr() as *const _,
+            window,
+            ptr::null_mut::<()>(),
+        );
 
         (!ic.is_null()).then(|| ic)
     }
@@ -326,13 +337,17 @@ impl ImeContext {
         xconn.check_errors()
     }
 
+    pub fn is_allowed(&self) -> bool {
+        !matches!(self.style, Style::None(_))
+    }
+
     // Set the spot for preedit text. Setting spot isn't working with libX11 when preedit callbacks
     // are being used. Certain IMEs do show selection window, but it's placed in bottom left of the
     // window and couldn't be changed.
     //
     // For me see: https://bugs.freedesktop.org/show_bug.cgi?id=1580.
     pub fn set_spot(&mut self, xconn: &Arc<XConnection>, x: c_short, y: c_short) {
-        if !self.is_allowed || self.ic_spot.x == x && self.ic_spot.y == y {
+        if !self.is_allowed() || self.ic_spot.x == x && self.ic_spot.y == y {
             return;
         }
 

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

@@ -1,8 +1,11 @@
-use std::{collections::HashMap, mem, ptr, sync::Arc};
+use std::{collections::HashMap, mem, sync::Arc};
 
 use super::{ffi, XConnection, XError};
 
-use super::{context::ImeContext, input_method::PotentialInputMethods};
+use super::{
+    context::ImeContext,
+    input_method::{InputMethod, PotentialInputMethods},
+};
 use crate::platform_impl::platform::x11::ime::ImeEventSender;
 
 pub unsafe fn close_im(xconn: &Arc<XConnection>, im: ffi::XIM) -> Result<(), XError> {
@@ -17,8 +20,7 @@ pub unsafe fn destroy_ic(xconn: &Arc<XConnection>, ic: ffi::XIC) -> Result<(), X
 
 pub struct ImeInner {
     pub xconn: Arc<XConnection>,
-    // WARNING: this is initially null!
-    pub im: ffi::XIM,
+    pub im: Option<InputMethod>,
     pub potential_input_methods: PotentialInputMethods,
     pub contexts: HashMap<ffi::Window, Option<ImeContext>>,
     // WARNING: this is initially zeroed!
@@ -38,7 +40,7 @@ impl ImeInner {
     ) -> Self {
         ImeInner {
             xconn,
-            im: ptr::null_mut(),
+            im: None,
             potential_input_methods,
             contexts: HashMap::new(),
             destroy_callback: unsafe { mem::zeroed() },
@@ -49,8 +51,8 @@ impl ImeInner {
     }
 
     pub unsafe fn close_im_if_necessary(&self) -> Result<bool, XError> {
-        if !self.is_destroyed {
-            close_im(&self.xconn, self.im).map(|_| true)
+        if !self.is_destroyed && self.im.is_some() {
+            close_im(&self.xconn, self.im.as_ref().unwrap().im).map(|_| true)
         } else {
             Ok(false)
         }

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

@@ -2,7 +2,7 @@ use std::{
     env,
     ffi::{CStr, CString, IntoStringError},
     fmt,
-    os::raw::c_char,
+    os::raw::{c_char, c_ulong, c_ushort},
     ptr,
     sync::Arc,
 };
@@ -41,15 +41,97 @@ unsafe fn open_im(xconn: &Arc<XConnection>, locale_modifiers: &CStr) -> Option<f
 #[derive(Debug)]
 pub struct InputMethod {
     pub im: ffi::XIM,
+    pub preedit_style: Style,
+    pub none_style: Style,
     _name: String,
 }
 
 impl InputMethod {
-    fn new(im: ffi::XIM, name: String) -> Self {
-        InputMethod { im, _name: name }
+    fn new(xconn: &Arc<XConnection>, im: ffi::XIM, name: String) -> Option<Self> {
+        let mut styles: *mut XIMStyles = std::ptr::null_mut();
+
+        // Query the styles supported by the XIM.
+        unsafe {
+            if !(xconn.xlib.XGetIMValues)(
+                im,
+                ffi::XNQueryInputStyle_0.as_ptr() as *const _,
+                (&mut styles) as *mut _,
+                std::ptr::null_mut::<()>(),
+            )
+            .is_null()
+            {
+                return None;
+            }
+        }
+
+        let mut preedit_style = None;
+        let mut none_style = None;
+
+        unsafe {
+            std::slice::from_raw_parts((*styles).supported_styles, (*styles).count_styles as _)
+                .iter()
+                .for_each(|style| match *style {
+                    XIM_PREEDIT_STYLE => {
+                        preedit_style = Some(Style::Preedit(*style));
+                    }
+                    XIM_NOTHING_STYLE if preedit_style.is_none() => {
+                        preedit_style = Some(Style::Nothing(*style))
+                    }
+                    XIM_NONE_STYLE => none_style = Some(Style::None(*style)),
+                    _ => (),
+                });
+
+            (xconn.xlib.XFree)(styles.cast());
+        };
+
+        if preedit_style.is_none() && none_style.is_none() {
+            return None;
+        }
+
+        let preedit_style = preedit_style.unwrap_or_else(|| none_style.unwrap());
+        let none_style = none_style.unwrap_or(preedit_style);
+
+        Some(InputMethod {
+            im,
+            _name: name,
+            preedit_style,
+            none_style,
+        })
     }
 }
 
+const XIM_PREEDIT_STYLE: XIMStyle = (ffi::XIMPreeditCallbacks | ffi::XIMStatusNothing) as XIMStyle;
+const XIM_NOTHING_STYLE: XIMStyle = (ffi::XIMPreeditNothing | ffi::XIMStatusNothing) as XIMStyle;
+const XIM_NONE_STYLE: XIMStyle = (ffi::XIMPreeditNone | ffi::XIMStatusNone) as XIMStyle;
+
+/// Style of the IME context.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Style {
+    /// Preedit callbacks.
+    Preedit(XIMStyle),
+
+    /// Nothing.
+    Nothing(XIMStyle),
+
+    /// No IME.
+    None(XIMStyle),
+}
+
+impl Default for Style {
+    fn default() -> Self {
+        Style::None(XIM_NONE_STYLE)
+    }
+}
+
+#[repr(C)]
+#[derive(Debug)]
+struct XIMStyles {
+    count_styles: c_ushort,
+    supported_styles: *const XIMStyle,
+}
+
+pub(crate) type XIMStyle = c_ulong;
+
 #[derive(Debug)]
 pub enum InputMethodResult {
     /// Input method used locale modifier from `XMODIFIERS` environment variable.
@@ -175,7 +257,7 @@ impl PotentialInputMethod {
     pub fn open_im(&mut self, xconn: &Arc<XConnection>) -> Option<InputMethod> {
         let im = unsafe { open_im(xconn, &self.name.c_string) };
         self.successful = Some(im.is_some());
-        im.map(|im| InputMethod::new(im, self.name.string.clone()))
+        im.and_then(|im| InputMethod::new(xconn, im, self.name.string.clone()))
     }
 }
 

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

@@ -17,8 +17,9 @@ use self::{
     callbacks::*,
     context::ImeContext,
     inner::{close_im, ImeInner},
-    input_method::PotentialInputMethods,
+    input_method::{PotentialInputMethods, Style},
 };
+
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub enum ImeEvent {
@@ -87,7 +88,6 @@ impl Ime {
 
         let is_fallback = input_method.is_fallback();
         if let Some(input_method) = input_method.ok() {
-            inner.im = input_method.im;
             inner.is_fallback = is_fallback;
             unsafe {
                 let result = set_destroy_callback(&xconn, input_method.im, &*inner)
@@ -97,6 +97,7 @@ impl Ime {
                 }
                 result?;
             }
+            inner.im = Some(input_method);
             Ok(Ime { xconn, inner })
         } else {
             Err(ImeCreationError::OpenFailure(inner.potential_input_methods))
@@ -120,37 +121,35 @@ impl Ime {
             // Create empty entry in map, so that when IME is rebuilt, this window has a context.
             None
         } else {
+            let im = self.inner.im.as_ref().unwrap();
+            let style = if with_preedit {
+                im.preedit_style
+            } else {
+                im.none_style
+            };
+
             let context = unsafe {
                 ImeContext::new(
                     &self.inner.xconn,
-                    self.inner.im,
+                    im.im,
+                    style,
                     window,
                     None,
-                    with_preedit,
                     self.inner.event_sender.clone(),
-                )
-                .or_else(|_| {
-                    debug!(
-                        "failed to create an IME context {} preedit support",
-                        if with_preedit { "with" } else { "without" }
-                    );
-                    ImeContext::new(
-                        &self.inner.xconn,
-                        self.inner.im,
-                        window,
-                        None,
-                        !with_preedit,
-                        self.inner.event_sender.clone(),
-                    )
-                })
-            }?;
+                )?
+            };
 
             // Check the state on the context, since it could fail to enable or disable preedit.
-            let event = if context.is_allowed {
-                ImeEvent::Enabled
-            } else {
-                // There's no IME without preedit.
+            let event = if matches!(style, Style::None(_)) {
+                if with_preedit {
+                    debug!("failed to create IME context with preedit support.")
+                }
                 ImeEvent::Disabled
+            } else {
+                if !with_preedit {
+                    debug!("failed to create IME context without preedit support.")
+                }
+                ImeEvent::Enabled
             };
 
             self.inner
@@ -160,6 +159,7 @@ impl Ime {
 
             Some(context)
         };
+
         self.inner.contexts.insert(window, context);
         Ok(!self.is_destroyed())
     }
@@ -223,7 +223,7 @@ impl Ime {
         }
 
         if let Some(&mut Some(ref mut context)) = self.inner.contexts.get_mut(&window) {
-            if allowed == context.is_allowed {
+            if allowed == context.is_allowed() {
                 return;
             }
         }

src/platform_impl/macos/view.rs

@@ -641,6 +641,10 @@ extern "C" fn insert_text(this: &Object, _sel: Sel, string: id, _replacement_ran
         //let event: id = msg_send![NSApp(), currentEvent];
 
         if state.is_ime_enabled() && !is_control {
+            AppState::queue_event(EventWrapper::StaticEvent(Event::WindowEvent {
+                window_id: WindowId(get_window_id(state.ns_window)),
+                event: WindowEvent::Ime(Ime::Preedit(String::new(), None)),
+            }));
             AppState::queue_event(EventWrapper::StaticEvent(Event::WindowEvent {
                 window_id: WindowId(get_window_id(state.ns_window)),
                 event: WindowEvent::Ime(Ime::Commit(string)),

src/platform_impl/windows/event_loop.rs

@@ -25,9 +25,9 @@ use windows_sys::Win32::{
     Devices::HumanInterfaceDevice::MOUSE_MOVE_RELATIVE,
     Foundation::{BOOL, HANDLE, HWND, LPARAM, LRESULT, POINT, RECT, WAIT_TIMEOUT, WPARAM},
     Graphics::Gdi::{
-        ClientToScreen, GetMonitorInfoW, GetUpdateRect, MonitorFromRect, MonitorFromWindow,
-        RedrawWindow, ScreenToClient, ValidateRect, MONITORINFO, MONITOR_DEFAULTTONULL,
-        RDW_INTERNALPAINT, SC_SCREENSAVE,
+        GetMonitorInfoW, GetUpdateRect, MonitorFromRect, MonitorFromWindow, RedrawWindow,
+        ScreenToClient, ValidateRect, MONITORINFO, MONITOR_DEFAULTTONULL, RDW_INTERNALPAINT,
+        SC_SCREENSAVE,
     },
     Media::{timeBeginPeriod, timeEndPeriod, timeGetDevCaps, TIMECAPS, TIMERR_NOERROR},
     System::{Ole::RevokeDragDrop, Threading::GetCurrentThreadId, WindowsProgramming::INFINITE},
@@ -37,7 +37,7 @@ use windows_sys::Win32::{
             Ime::{GCS_COMPSTR, GCS_RESULTSTR, ISC_SHOWUICOMPOSITIONWINDOW},
             KeyboardAndMouse::{
                 MapVirtualKeyA, ReleaseCapture, SetCapture, TrackMouseEvent, TME_LEAVE,
-                TRACKMOUSEEVENT, VK_F4,
+                TRACKMOUSEEVENT,
             },
             Pointer::{
                 POINTER_FLAG_DOWN, POINTER_FLAG_UP, POINTER_FLAG_UPDATE, POINTER_INFO,
@@ -50,20 +50,20 @@ use windows_sys::Win32::{
             RIM_TYPEKEYBOARD, RIM_TYPEMOUSE,
         },
         WindowsAndMessaging::{
-            CreateWindowExW, DefWindowProcW, DestroyWindow, DispatchMessageW, GetClientRect,
-            GetCursorPos, GetMessageW, GetWindowLongW, LoadCursorW, MsgWaitForMultipleObjectsEx,
-            PeekMessageW, PostMessageW, PostThreadMessageW, RegisterClassExW,
-            RegisterWindowMessageA, SetCursor, SetWindowPos, TranslateMessage, CREATESTRUCTW,
-            GIDC_ARRIVAL, GIDC_REMOVAL, GWL_EXSTYLE, GWL_STYLE, GWL_USERDATA, HTCAPTION, HTCLIENT,
-            MAPVK_VK_TO_VSC, MINMAXINFO, MSG, MWMO_INPUTAVAILABLE, PM_NOREMOVE, PM_QS_PAINT,
-            PM_REMOVE, PT_PEN, PT_TOUCH, QS_ALLEVENTS, RI_KEY_E0, RI_KEY_E1, RI_MOUSE_WHEEL,
-            SC_MINIMIZE, SC_RESTORE, SIZE_MAXIMIZED, SWP_NOACTIVATE, SWP_NOMOVE, SWP_NOSIZE,
-            SWP_NOZORDER, WHEEL_DELTA, WINDOWPOS, WM_CAPTURECHANGED, WM_CHAR, WM_CLOSE, WM_CREATE,
-            WM_DESTROY, WM_DPICHANGED, WM_DROPFILES, WM_ENTERSIZEMOVE, WM_EXITSIZEMOVE,
-            WM_GETMINMAXINFO, WM_IME_COMPOSITION, WM_IME_ENDCOMPOSITION, WM_IME_SETCONTEXT,
-            WM_IME_STARTCOMPOSITION, WM_INPUT, WM_INPUT_DEVICE_CHANGE, WM_KEYDOWN, WM_KEYUP,
-            WM_KILLFOCUS, WM_LBUTTONDOWN, WM_LBUTTONUP, WM_MBUTTONDOWN, WM_MBUTTONUP,
-            WM_MOUSEHWHEEL, WM_MOUSEMOVE, WM_MOUSEWHEEL, WM_NCACTIVATE, WM_NCCREATE, WM_NCDESTROY,
+            CreateWindowExW, DefWindowProcW, DestroyWindow, DispatchMessageW, GetCursorPos,
+            GetMessageW, LoadCursorW, MsgWaitForMultipleObjectsEx, PeekMessageW, PostMessageW,
+            PostThreadMessageW, RegisterClassExW, RegisterWindowMessageA, SetCursor, SetWindowPos,
+            TranslateMessage, CREATESTRUCTW, GIDC_ARRIVAL, GIDC_REMOVAL, GWL_STYLE, GWL_USERDATA,
+            HTCAPTION, HTCLIENT, MAPVK_VK_TO_VSC, MINMAXINFO, MNC_CLOSE, MSG, MWMO_INPUTAVAILABLE,
+            NCCALCSIZE_PARAMS, PM_NOREMOVE, PM_QS_PAINT, PM_REMOVE, PT_PEN, PT_TOUCH, QS_ALLEVENTS,
+            RI_KEY_E0, RI_KEY_E1, RI_MOUSE_WHEEL, SC_MINIMIZE, SC_RESTORE, SIZE_MAXIMIZED,
+            SWP_NOACTIVATE, SWP_NOMOVE, SWP_NOSIZE, SWP_NOZORDER, WHEEL_DELTA, WINDOWPOS,
+            WM_CAPTURECHANGED, WM_CHAR, WM_CLOSE, WM_CREATE, WM_DESTROY, WM_DPICHANGED,
+            WM_DROPFILES, WM_ENTERSIZEMOVE, WM_EXITSIZEMOVE, WM_GETMINMAXINFO, WM_IME_COMPOSITION,
+            WM_IME_ENDCOMPOSITION, WM_IME_SETCONTEXT, WM_IME_STARTCOMPOSITION, WM_INPUT,
+            WM_INPUT_DEVICE_CHANGE, WM_KEYDOWN, WM_KEYUP, WM_KILLFOCUS, WM_LBUTTONDOWN,
+            WM_LBUTTONUP, WM_MBUTTONDOWN, WM_MBUTTONUP, WM_MENUCHAR, WM_MOUSEHWHEEL, WM_MOUSEMOVE,
+            WM_MOUSEWHEEL, WM_NCACTIVATE, WM_NCCALCSIZE, WM_NCCREATE, WM_NCDESTROY,
             WM_NCLBUTTONDOWN, WM_PAINT, WM_POINTERDOWN, WM_POINTERUP, WM_POINTERUPDATE,
             WM_RBUTTONDOWN, WM_RBUTTONUP, WM_SETCURSOR, WM_SETFOCUS, WM_SETTINGCHANGE, WM_SIZE,
             WM_SYSCHAR, WM_SYSCOMMAND, WM_SYSKEYDOWN, WM_SYSKEYUP, WM_TOUCH, WM_WINDOWPOSCHANGED,
@@ -633,10 +633,12 @@ pub static TASKBAR_CREATED: Lazy<u32> =
     Lazy::new(|| unsafe { RegisterWindowMessageA("TaskbarCreated\0".as_ptr()) });
 
 fn create_event_target_window<T: 'static>() -> HWND {
+    use windows_sys::Win32::UI::WindowsAndMessaging::CS_HREDRAW;
+    use windows_sys::Win32::UI::WindowsAndMessaging::CS_VREDRAW;
     unsafe {
         let class = WNDCLASSEXW {
             cbSize: mem::size_of::<WNDCLASSEXW>() as u32,
-            style: 0,
+            style: CS_HREDRAW | CS_VREDRAW,
             lpfnWndProc: Some(thread_event_target_callback::<T>),
             cbClsExtra: 0,
             cbWndExtra: 0,
@@ -968,6 +970,32 @@ unsafe fn public_window_callback_inner<T: 'static>(
     // the closure to catch_unwind directly so that the match body indendation wouldn't change and
     // the git blame and history would be preserved.
     let callback = || match msg {
+        WM_NCCALCSIZE => {
+            let window_flags = userdata.window_state.lock().window_flags;
+            if wparam == 0 || window_flags.contains(WindowFlags::MARKER_DECORATIONS) {
+                return DefWindowProcW(window, msg, wparam, lparam);
+            }
+
+            // Extend the client area to cover the whole non-client area.
+            // https://docs.microsoft.com/en-us/windows/win32/winmsg/wm-nccalcsize#remarks
+            //
+            // HACK(msiglreith): To add the drop shadow we slightly tweak the non-client area.
+            // This leads to a small black 1px border on the top. Adding a margin manually
+            // on all 4 borders would result in the caption getting drawn by the DWM.
+            //
+            // Another option would be to allow the DWM to paint inside the client area.
+            // Unfortunately this results in janky resize behavior, where the compositor is
+            // ahead of the window surface. Currently, there seems no option to achieve this
+            // with the Windows API.
+            if window_flags.contains(WindowFlags::MARKER_UNDECORATED_SHADOW) {
+                let params = &mut *(lparam as *mut NCCALCSIZE_PARAMS);
+                params.rgrc[0].top += 1;
+                params.rgrc[0].bottom += 1;
+            }
+
+            0
+        }
+
         WM_ENTERSIZEMOVE => {
             userdata
                 .window_state
@@ -1049,7 +1077,7 @@ unsafe fn public_window_callback_inner<T: 'static>(
                 const NOMOVE_OR_NOSIZE: u32 = SWP_NOMOVE | SWP_NOSIZE;
 
                 let new_rect = if window_pos.flags & NOMOVE_OR_NOSIZE != 0 {
-                    let cur_rect = util::get_window_rect(window)
+                    let cur_rect = util::WindowArea::Outer.get_rect(window)
                         .expect("Unexpected GetWindowRect failure; please report this error to https://github.com/rust-windowing/winit");
 
                     match window_pos.flags & NOMOVE_OR_NOSIZE {
@@ -1190,9 +1218,23 @@ unsafe fn public_window_callback_inner<T: 'static>(
                     });
                 }
             }
-            0
+
+            // todo(msiglreith):
+            //   Ideally, `WM_SYSCHAR` shouldn't emit a `ReceivedChar` event
+            //   indicating user text input. As we lack dedicated support
+            //   accelerators/keybindings these events will be additionally
+            //   emitted for downstream users.
+            //   This means certain key combinations (ie Alt + Space) will
+            //   trigger the default system behavior **and** emit a char event.
+            if msg == WM_SYSCHAR {
+                DefWindowProcW(window, msg, wparam, lparam)
+            } else {
+                0
+            }
         }
 
+        WM_MENUCHAR => (MNC_CLOSE << 16) as isize,
+
         WM_IME_STARTCOMPOSITION => {
             let ime_allowed = userdata.window_state.lock().ime_allowed;
             if ime_allowed {
@@ -1230,6 +1272,10 @@ unsafe fn public_window_callback_inner<T: 'static>(
                     if let Some(text) = ime_context.get_composed_text() {
                         userdata.window_state.lock().ime_state = ImeState::Enabled;
 
+                        userdata.send_event(Event::WindowEvent {
+                            window_id: RootWindowId(WindowId(window)),
+                            event: WindowEvent::Ime(Ime::Preedit(String::new(), None)),
+                        });
                         userdata.send_event(Event::WindowEvent {
                             window_id: RootWindowId(WindowId(window)),
                             event: WindowEvent::Ime(Ime::Commit(text)),
@@ -1266,6 +1312,10 @@ unsafe fn public_window_callback_inner<T: 'static>(
                     // trying receiving composing result and commit if exists.
                     let ime_context = ImeContext::current(window);
                     if let Some(text) = ime_context.get_composed_text() {
+                        userdata.send_event(Event::WindowEvent {
+                            window_id: RootWindowId(WindowId(window)),
+                            event: WindowEvent::Ime(Ime::Preedit(String::new(), None)),
+                        });
                         userdata.send_event(Event::WindowEvent {
                             window_id: RootWindowId(WindowId(window)),
                             event: WindowEvent::Ime(Ime::Commit(text)),
@@ -1435,35 +1485,36 @@ unsafe fn public_window_callback_inner<T: 'static>(
 
         WM_KEYDOWN | WM_SYSKEYDOWN => {
             use crate::event::{ElementState::Pressed, VirtualKeyCode};
-            if msg == WM_SYSKEYDOWN && wparam == VK_F4 as usize {
-                DefWindowProcW(window, msg, wparam, lparam)
-            } else {
-                if let Some((scancode, vkey)) = process_key_params(wparam, lparam) {
-                    update_modifiers(window, userdata);
+            if let Some((scancode, vkey)) = process_key_params(wparam, lparam) {
+                update_modifiers(window, userdata);
 
-                    #[allow(deprecated)]
+                #[allow(deprecated)]
+                userdata.send_event(Event::WindowEvent {
+                    window_id: RootWindowId(WindowId(window)),
+                    event: WindowEvent::KeyboardInput {
+                        device_id: DEVICE_ID,
+                        input: KeyboardInput {
+                            state: Pressed,
+                            scancode,
+                            virtual_keycode: vkey,
+                            modifiers: event::get_key_mods(),
+                        },
+                        is_synthetic: false,
+                    },
+                });
+                // Windows doesn't emit a delete character by default, but in order to make it
+                // consistent with the other platforms we'll emit a delete character here.
+                if vkey == Some(VirtualKeyCode::Delete) {
                     userdata.send_event(Event::WindowEvent {
                         window_id: RootWindowId(WindowId(window)),
-                        event: WindowEvent::KeyboardInput {
-                            device_id: DEVICE_ID,
-                            input: KeyboardInput {
-                                state: Pressed,
-                                scancode,
-                                virtual_keycode: vkey,
-                                modifiers: event::get_key_mods(),
-                            },
-                            is_synthetic: false,
-                        },
+                        event: WindowEvent::ReceivedCharacter('\u{7F}'),
                     });
-                    // Windows doesn't emit a delete character by default, but in order to make it
-                    // consistent with the other platforms we'll emit a delete character here.
-                    if vkey == Some(VirtualKeyCode::Delete) {
-                        userdata.send_event(Event::WindowEvent {
-                            window_id: RootWindowId(WindowId(window)),
-                            event: WindowEvent::ReceivedCharacter('\u{7F}'),
-                        });
-                    }
                 }
+            }
+
+            if msg == WM_SYSKEYDOWN {
+                DefWindowProcW(window, msg, wparam, lparam)
+            } else {
                 0
             }
         }
@@ -1860,7 +1911,7 @@ unsafe fn public_window_callback_inner<T: 'static>(
         }
 
         WM_NCACTIVATE => {
-            let is_active = wparam == 1;
+            let is_active = wparam != false.into();
             let active_focus_changed = userdata.window_state.lock().set_active(is_active);
             if active_focus_changed {
                 if is_active {
@@ -1921,11 +1972,13 @@ unsafe fn public_window_callback_inner<T: 'static>(
             let mmi = lparam as *mut MINMAXINFO;
 
             let window_state = userdata.window_state.lock();
+            let window_flags = window_state.window_flags;
 
             if window_state.min_size.is_some() || window_state.max_size.is_some() {
                 if let Some(min_size) = window_state.min_size {
                     let min_size = min_size.to_physical(window_state.scale_factor);
-                    let (width, height): (u32, u32) = util::adjust_size(window, min_size).into();
+                    let (width, height): (u32, u32) =
+                        window_flags.adjust_size(window, min_size).into();
                     (*mmi).ptMinTrackSize = POINT {
                         x: width as i32,
                         y: height as i32,
@@ -1933,7 +1986,8 @@ unsafe fn public_window_callback_inner<T: 'static>(
                 }
                 if let Some(max_size) = window_state.max_size {
                     let max_size = max_size.to_physical(window_state.scale_factor);
-                    let (width, height): (u32, u32) = util::adjust_size(window, max_size).into();
+                    let (width, height): (u32, u32) =
+                        window_flags.adjust_size(window, max_size).into();
                     (*mmi).ptMaxTrackSize = POINT {
                         x: width as i32,
                         y: height as i32,
@@ -1957,7 +2011,7 @@ unsafe fn public_window_callback_inner<T: 'static>(
             let new_scale_factor = dpi_to_scale_factor(new_dpi_x);
             let old_scale_factor: f64;
 
-            let allow_resize = {
+            let (allow_resize, window_flags) = {
                 let mut window_state = userdata.window_state.lock();
                 old_scale_factor = window_state.scale_factor;
                 window_state.scale_factor = new_scale_factor;
@@ -1966,12 +2020,11 @@ unsafe fn public_window_callback_inner<T: 'static>(
                     return 0;
                 }
 
-                window_state.fullscreen.is_none()
-                    && !window_state.window_flags().contains(WindowFlags::MAXIMIZED)
-            };
+                let allow_resize = window_state.fullscreen.is_none()
+                    && !window_state.window_flags().contains(WindowFlags::MAXIMIZED);
 
-            let style = GetWindowLongW(window, GWL_STYLE) as u32;
-            let style_ex = GetWindowLongW(window, GWL_EXSTYLE) as u32;
+                (allow_resize, window_state.window_flags)
+            };
 
             // New size as suggested by Windows.
             let suggested_rect = *(lparam as *const RECT);
@@ -1985,28 +2038,18 @@ unsafe fn public_window_callback_inner<T: 'static>(
             // let margin_right: i32;
             // let margin_bottom: i32;
             {
-                let adjusted_rect =
-                    util::adjust_window_rect_with_styles(window, style, style_ex, suggested_rect)
-                        .unwrap_or(suggested_rect);
+                let adjusted_rect = window_flags
+                    .adjust_rect(window, suggested_rect)
+                    .unwrap_or(suggested_rect);
                 margin_left = suggested_rect.left - adjusted_rect.left;
                 margin_top = suggested_rect.top - adjusted_rect.top;
                 // margin_right = adjusted_rect.right - suggested_rect.right;
                 // margin_bottom = adjusted_rect.bottom - suggested_rect.bottom;
             }
 
-            let old_physical_inner_rect = {
-                let mut old_physical_inner_rect = mem::zeroed();
-                GetClientRect(window, &mut old_physical_inner_rect);
-                let mut origin = mem::zeroed();
-                ClientToScreen(window, &mut origin);
-
-                old_physical_inner_rect.left += origin.x;
-                old_physical_inner_rect.right += origin.x;
-                old_physical_inner_rect.top += origin.y;
-                old_physical_inner_rect.bottom += origin.y;
-
-                old_physical_inner_rect
-            };
+            let old_physical_inner_rect = util::WindowArea::Inner
+                .get_rect(window)
+                .expect("failed to query (old) inner window area");
             let old_physical_inner_size = PhysicalSize::new(
                 (old_physical_inner_rect.right - old_physical_inner_rect.left) as u32,
                 (old_physical_inner_rect.bottom - old_physical_inner_rect.top) as u32,
@@ -2060,13 +2103,9 @@ unsafe fn public_window_callback_inner<T: 'static>(
                     bottom: suggested_ul.1 + new_physical_inner_size.height as i32,
                 };
 
-                conservative_rect = util::adjust_window_rect_with_styles(
-                    window,
-                    style,
-                    style_ex,
-                    conservative_rect,
-                )
-                .unwrap_or(conservative_rect);
+                conservative_rect = window_flags
+                    .adjust_rect(window, conservative_rect)
+                    .unwrap_or(conservative_rect);
 
                 // If we're dragging the window, offset the window so that the cursor's
                 // relative horizontal position in the title bar is preserved.

src/platform_impl/windows/event_loop/runner.rs

@@ -16,7 +16,10 @@ use crate::{
     dpi::PhysicalSize,
     event::{Event, StartCause, WindowEvent},
     event_loop::ControlFlow,
-    platform_impl::platform::util,
+    platform_impl::platform::{
+        event_loop::{WindowData, GWL_USERDATA},
+        get_window_long,
+    },
     window::WindowId,
 };
 
@@ -434,11 +437,13 @@ impl<T> BufferedEvent<T> {
                         new_inner_size: &mut new_inner_size,
                     },
                 });
-                util::set_inner_size_physical(
-                    (window_id.0).0,
-                    new_inner_size.width as _,
-                    new_inner_size.height as _,
-                );
+
+                let window_flags = unsafe {
+                    let userdata =
+                        get_window_long(window_id.0.into(), GWL_USERDATA) as *mut WindowData<T>;
+                    (*userdata).window_state.lock().window_flags
+                };
+                window_flags.set_size((window_id.0).0, new_inner_size);
             }
         }
     }

src/platform_impl/windows/mod.rs

@@ -36,6 +36,7 @@ pub struct PlatformSpecificWindowBuilderAttributes {
     pub drag_and_drop: bool,
     pub preferred_theme: Option<Theme>,
     pub skip_taskbar: bool,
+    pub decoration_shadow: bool,
 }
 
 impl Default for PlatformSpecificWindowBuilderAttributes {
@@ -48,6 +49,7 @@ impl Default for PlatformSpecificWindowBuilderAttributes {
             drag_and_drop: true,
             preferred_theme: None,
             skip_taskbar: false,
+            decoration_shadow: false,
         }
     }
 }
@@ -106,6 +108,12 @@ impl From<WindowId> for u64 {
     }
 }
 
+impl From<WindowId> for HWND {
+    fn from(window_id: WindowId) -> Self {
+        window_id.0
+    }
+}
+
 impl From<u64> for WindowId {
     fn from(raw_id: u64) -> Self {
         Self(raw_id as HWND)

src/platform_impl/windows/util.rs

@@ -14,7 +14,7 @@ use windows_sys::{
     core::{HRESULT, PCWSTR},
     Win32::{
         Foundation::{BOOL, HINSTANCE, HWND, RECT},
-        Graphics::Gdi::{ClientToScreen, InvalidateRgn, HMONITOR},
+        Graphics::Gdi::{ClientToScreen, HMONITOR},
         System::{
             LibraryLoader::{GetProcAddress, LoadLibraryA},
             SystemServices::IMAGE_DOS_HEADER,
@@ -23,19 +23,16 @@ use windows_sys::{
             HiDpi::{DPI_AWARENESS_CONTEXT, MONITOR_DPI_TYPE, PROCESS_DPI_AWARENESS},
             Input::KeyboardAndMouse::GetActiveWindow,
             WindowsAndMessaging::{
-                AdjustWindowRectEx, ClipCursor, GetClientRect, GetClipCursor, GetMenu,
-                GetSystemMetrics, GetWindowLongW, GetWindowRect, SetWindowPos, ShowCursor,
-                GWL_EXSTYLE, GWL_STYLE, IDC_APPSTARTING, IDC_ARROW, IDC_CROSS, IDC_HAND, IDC_HELP,
-                IDC_IBEAM, IDC_NO, IDC_SIZEALL, IDC_SIZENESW, IDC_SIZENS, IDC_SIZENWSE, IDC_SIZEWE,
-                IDC_WAIT, SM_CXVIRTUALSCREEN, SM_CYVIRTUALSCREEN, SM_XVIRTUALSCREEN,
-                SM_YVIRTUALSCREEN, SWP_ASYNCWINDOWPOS, SWP_NOACTIVATE, SWP_NOMOVE,
-                SWP_NOREPOSITION, SWP_NOZORDER, WINDOW_EX_STYLE, WINDOW_STYLE,
+                ClipCursor, GetClientRect, GetClipCursor, GetSystemMetrics, GetWindowRect,
+                ShowCursor, IDC_APPSTARTING, IDC_ARROW, IDC_CROSS, IDC_HAND, IDC_HELP, IDC_IBEAM,
+                IDC_NO, IDC_SIZEALL, IDC_SIZENESW, IDC_SIZENS, IDC_SIZENWSE, IDC_SIZEWE, IDC_WAIT,
+                SM_CXVIRTUALSCREEN, SM_CYVIRTUALSCREEN, SM_XVIRTUALSCREEN, SM_YVIRTUALSCREEN,
             },
         },
     },
 };
 
-use crate::{dpi::PhysicalSize, window::CursorIcon};
+use crate::window::CursorIcon;
 
 pub fn encode_wide(string: impl AsRef<OsStr>) -> Vec<u16> {
     string.as_ref().encode_wide().chain(once(0)).collect()
@@ -56,114 +53,43 @@ where
     bitset & flag == flag
 }
 
-pub unsafe fn status_map<T, F: FnMut(&mut T) -> BOOL>(mut fun: F) -> Option<T> {
-    let mut data: T = mem::zeroed();
-    if fun(&mut data) != false.into() {
-        Some(data)
-    } else {
-        None
-    }
-}
-
-fn win_to_err<F: FnOnce() -> BOOL>(f: F) -> Result<(), io::Error> {
-    if f() != false.into() {
+pub(crate) fn win_to_err(result: BOOL) -> Result<(), io::Error> {
+    if result != false.into() {
         Ok(())
     } else {
         Err(io::Error::last_os_error())
     }
 }
 
-pub fn get_window_rect(hwnd: HWND) -> Option<RECT> {
-    unsafe { status_map(|rect| GetWindowRect(hwnd, rect)) }
+pub enum WindowArea {
+    Outer,
+    Inner,
 }
 
-pub fn get_client_rect(hwnd: HWND) -> Result<RECT, io::Error> {
-    unsafe {
-        let mut rect = mem::zeroed();
-        let mut top_left = mem::zeroed();
+impl WindowArea {
+    pub fn get_rect(self, hwnd: HWND) -> Result<RECT, io::Error> {
+        let mut rect = unsafe { mem::zeroed() };
 
-        win_to_err(|| ClientToScreen(hwnd, &mut top_left))?;
-        win_to_err(|| GetClientRect(hwnd, &mut rect))?;
-        rect.left += top_left.x;
-        rect.top += top_left.y;
-        rect.right += top_left.x;
-        rect.bottom += top_left.y;
+        match self {
+            WindowArea::Outer => {
+                win_to_err(unsafe { GetWindowRect(hwnd, &mut rect) })?;
+            }
+            WindowArea::Inner => unsafe {
+                let mut top_left = mem::zeroed();
+
+                win_to_err(ClientToScreen(hwnd, &mut top_left))?;
+                win_to_err(GetClientRect(hwnd, &mut rect))?;
+                rect.left += top_left.x;
+                rect.top += top_left.y;
+                rect.right += top_left.x;
+                rect.bottom += top_left.y;
+            },
+        }
 
         Ok(rect)
     }
 }
 
-pub fn adjust_size(hwnd: HWND, size: PhysicalSize<u32>) -> PhysicalSize<u32> {
-    let (width, height): (u32, u32) = size.into();
-    let rect = RECT {
-        left: 0,
-        right: width as i32,
-        top: 0,
-        bottom: height as i32,
-    };
-    let rect = adjust_window_rect(hwnd, rect).unwrap_or(rect);
-    PhysicalSize::new((rect.right - rect.left) as _, (rect.bottom - rect.top) as _)
-}
-
-pub(crate) fn set_inner_size_physical(window: HWND, x: u32, y: u32) {
-    unsafe {
-        let rect = adjust_window_rect(
-            window,
-            RECT {
-                top: 0,
-                left: 0,
-                bottom: y as i32,
-                right: x as i32,
-            },
-        )
-        .expect("adjust_window_rect failed");
-
-        let outer_x = (rect.right - rect.left).abs() as _;
-        let outer_y = (rect.top - rect.bottom).abs() as _;
-        SetWindowPos(
-            window,
-            0,
-            0,
-            0,
-            outer_x,
-            outer_y,
-            SWP_ASYNCWINDOWPOS | SWP_NOZORDER | SWP_NOREPOSITION | SWP_NOMOVE | SWP_NOACTIVATE,
-        );
-        InvalidateRgn(window, 0, false.into());
-    }
-}
-
-pub fn adjust_window_rect(hwnd: HWND, rect: RECT) -> Option<RECT> {
-    unsafe {
-        let style = GetWindowLongW(hwnd, GWL_STYLE) as u32;
-        let style_ex = GetWindowLongW(hwnd, GWL_EXSTYLE) as u32;
-        adjust_window_rect_with_styles(hwnd, style, style_ex, rect)
-    }
-}
-
-pub fn adjust_window_rect_with_styles(
-    hwnd: HWND,
-    style: WINDOW_STYLE,
-    style_ex: WINDOW_EX_STYLE,
-    rect: RECT,
-) -> Option<RECT> {
-    unsafe {
-        status_map(|r| {
-            *r = rect;
-
-            let b_menu = GetMenu(hwnd) != 0;
-            if let (Some(get_dpi_for_window), Some(adjust_window_rect_ex_for_dpi)) =
-                (*GET_DPI_FOR_WINDOW, *ADJUST_WINDOW_RECT_EX_FOR_DPI)
-            {
-                let dpi = get_dpi_for_window(hwnd);
-                adjust_window_rect_ex_for_dpi(r, style, b_menu.into(), style_ex, dpi)
-            } else {
-                AdjustWindowRectEx(r, style, b_menu.into(), style_ex)
-            }
-        })
-    }
-}
-
 pub fn set_cursor_hidden(hidden: bool) {
     static HIDDEN: AtomicBool = AtomicBool::new(false);
     let changed = HIDDEN.swap(hidden, Ordering::SeqCst) ^ hidden;
@@ -175,7 +101,7 @@ pub fn set_cursor_hidden(hidden: bool) {
 pub fn get_cursor_clip() -> Result<RECT, io::Error> {
     unsafe {
         let mut rect: RECT = mem::zeroed();
-        win_to_err(|| GetClipCursor(&mut rect)).map(|_| rect)
+        win_to_err(GetClipCursor(&mut rect)).map(|_| rect)
     }
 }
 
@@ -188,7 +114,7 @@ pub fn set_cursor_clip(rect: Option<RECT>) -> Result<(), io::Error> {
             .as_ref()
             .map(|r| r as *const RECT)
             .unwrap_or(ptr::null());
-        win_to_err(|| ClipCursor(rect_ptr))
+        win_to_err(ClipCursor(rect_ptr))
     }
 }
 

src/platform_impl/windows/window.rs

@@ -132,7 +132,7 @@ impl Window {
 
     #[inline]
     pub fn outer_position(&self) -> Result<PhysicalPosition<i32>, NotSupportedError> {
-        util::get_window_rect(self.hwnd())
+        util::WindowArea::Outer.get_rect(self.hwnd())
             .map(|rect| Ok(PhysicalPosition::new(rect.left as i32, rect.top as i32)))
             .expect("Unexpected GetWindowRect failure; please report this error to https://github.com/rust-windowing/winit")
     }
@@ -187,7 +187,8 @@ impl Window {
 
     #[inline]
     pub fn outer_size(&self) -> PhysicalSize<u32> {
-        util::get_window_rect(self.hwnd())
+        util::WindowArea::Outer
+            .get_rect(self.hwnd())
             .map(|rect| {
                 PhysicalSize::new(
                     (rect.right - rect.left) as u32,
@@ -200,7 +201,7 @@ impl Window {
     #[inline]
     pub fn set_inner_size(&self, size: Size) {
         let scale_factor = self.scale_factor();
-        let (width, height) = size.to_physical::<u32>(scale_factor).into();
+        let physical_size = size.to_physical::<u32>(scale_factor);
 
         let window_state = Arc::clone(&self.window_state);
         let window = self.window.clone();
@@ -211,7 +212,8 @@ impl Window {
             });
         });
 
-        util::set_inner_size_physical(self.hwnd(), width, height);
+        let window_flags = self.window_state.lock().window_flags;
+        window_flags.set_size(self.hwnd(), physical_size);
     }
 
     #[inline]
@@ -577,7 +579,7 @@ impl Window {
         self.thread_executor.execute_in_thread(move || {
             let _ = &window;
             WindowState::set_window_flags(window_state.lock(), window.0, |f| {
-                f.set(WindowFlags::DECORATIONS, decorations)
+                f.set(WindowFlags::MARKER_DECORATIONS, decorations)
             });
         });
     }
@@ -585,7 +587,9 @@ impl Window {
     #[inline]
     pub fn is_decorated(&self) -> bool {
         let window_state = self.window_state.lock();
-        window_state.window_flags.contains(WindowFlags::DECORATIONS)
+        window_state
+            .window_flags
+            .contains(WindowFlags::MARKER_DECORATIONS)
     }
 
     #[inline]
@@ -691,6 +695,19 @@ impl Window {
         unsafe { set_skip_taskbar(self.hwnd(), skip) };
     }
 
+    #[inline]
+    pub fn set_undecorated_shadow(&self, shadow: bool) {
+        let window = self.window.clone();
+        let window_state = Arc::clone(&self.window_state);
+
+        self.thread_executor.execute_in_thread(move || {
+            let _ = &window;
+            WindowState::set_window_flags(window_state.lock(), window.0, |f| {
+                f.set(WindowFlags::MARKER_UNDECORATED_SHADOW, shadow)
+            });
+        });
+    }
+
     #[inline]
     pub fn focus_window(&self) {
         let window = self.window.clone();
@@ -898,6 +915,14 @@ impl<'a, T: 'static> InitData<'a, T> {
             }
         }
 
+        // let margins = MARGINS {
+        //     cxLeftWidth: 1,
+        //     cxRightWidth: 1,
+        //     cyTopHeight: 1,
+        //     cyBottomHeight: 1,
+        // };
+        // dbg!(DwmExtendFrameIntoClientArea(win.hwnd(), &margins as *const _));
+
         if let Some(position) = attributes.position {
             win.set_outer_position(position);
         }
@@ -916,7 +941,11 @@ where
     let class_name = register_window_class::<T>(&attributes.window_icon, &pl_attribs.taskbar_icon);
 
     let mut window_flags = WindowFlags::empty();
-    window_flags.set(WindowFlags::DECORATIONS, attributes.decorations);
+    window_flags.set(WindowFlags::MARKER_DECORATIONS, attributes.decorations);
+    window_flags.set(
+        WindowFlags::MARKER_UNDECORATED_SHADOW,
+        pl_attribs.decoration_shadow,
+    );
     window_flags.set(WindowFlags::ALWAYS_ON_TOP, attributes.always_on_top);
     window_flags.set(
         WindowFlags::NO_BACK_BUFFER,
@@ -997,6 +1026,7 @@ unsafe fn register_window_class<T: 'static>(
         .map(|icon| icon.inner.as_raw_handle())
         .unwrap_or(0);
 
+    use windows_sys::Win32::UI::WindowsAndMessaging::COLOR_WINDOWFRAME;
     let class = WNDCLASSEXW {
         cbSize: mem::size_of::<WNDCLASSEXW>() as u32,
         style: CS_HREDRAW | CS_VREDRAW,
@@ -1006,7 +1036,7 @@ unsafe fn register_window_class<T: 'static>(
         hInstance: util::get_instance_handle(),
         hIcon: h_icon,
         hCursor: 0, // must be null in order for cursor state to work properly
-        hbrBackground: 0,
+        hbrBackground: COLOR_WINDOWFRAME as _,
         lpszMenuName: ptr::null(),
         lpszClassName: class_name.as_ptr(),
         hIconSm: h_icon_small,

src/platform_impl/windows/window_state.rs

@@ -1,5 +1,5 @@
 use crate::{
-    dpi::{PhysicalPosition, Size},
+    dpi::{PhysicalPosition, PhysicalSize, Size},
     event::ModifiersState,
     icon::Icon,
     platform_impl::platform::{event_loop, util},
@@ -11,14 +11,15 @@ use windows_sys::Win32::{
     Foundation::{HWND, RECT},
     Graphics::Gdi::InvalidateRgn,
     UI::WindowsAndMessaging::{
-        SendMessageW, SetWindowLongW, SetWindowPos, ShowWindow, GWL_EXSTYLE, GWL_STYLE,
-        HWND_NOTOPMOST, HWND_TOPMOST, SWP_ASYNCWINDOWPOS, SWP_FRAMECHANGED, SWP_NOACTIVATE,
-        SWP_NOMOVE, SWP_NOSIZE, SWP_NOZORDER, SW_HIDE, SW_MAXIMIZE, SW_MINIMIZE, SW_RESTORE,
-        SW_SHOW, WINDOWPLACEMENT, WINDOW_EX_STYLE, WINDOW_STYLE, WS_BORDER, WS_CAPTION, WS_CHILD,
-        WS_CLIPCHILDREN, WS_CLIPSIBLINGS, WS_EX_ACCEPTFILES, WS_EX_APPWINDOW, WS_EX_LAYERED,
-        WS_EX_LEFT, WS_EX_NOREDIRECTIONBITMAP, WS_EX_TOPMOST, WS_EX_TRANSPARENT, WS_EX_WINDOWEDGE,
-        WS_MAXIMIZE, WS_MAXIMIZEBOX, WS_MINIMIZE, WS_MINIMIZEBOX, WS_OVERLAPPED,
-        WS_OVERLAPPEDWINDOW, WS_POPUP, WS_SIZEBOX, WS_SYSMENU, WS_VISIBLE,
+        AdjustWindowRectEx, GetMenu, GetWindowLongW, SendMessageW, SetWindowLongW, SetWindowPos,
+        ShowWindow, GWL_EXSTYLE, GWL_STYLE, HWND_NOTOPMOST, HWND_TOPMOST, SWP_ASYNCWINDOWPOS,
+        SWP_FRAMECHANGED, SWP_NOACTIVATE, SWP_NOMOVE, SWP_NOREPOSITION, SWP_NOSIZE, SWP_NOZORDER,
+        SW_HIDE, SW_MAXIMIZE, SW_MINIMIZE, SW_RESTORE, SW_SHOW, WINDOWPLACEMENT, WINDOW_EX_STYLE,
+        WINDOW_STYLE, WS_BORDER, WS_CAPTION, WS_CHILD, WS_CLIPCHILDREN, WS_CLIPSIBLINGS,
+        WS_EX_ACCEPTFILES, WS_EX_APPWINDOW, WS_EX_LAYERED, WS_EX_NOREDIRECTIONBITMAP,
+        WS_EX_TOPMOST, WS_EX_TRANSPARENT, WS_EX_WINDOWEDGE, WS_MAXIMIZE, WS_MAXIMIZEBOX,
+        WS_MINIMIZE, WS_MINIMIZEBOX, WS_OVERLAPPEDWINDOW, WS_POPUP, WS_SIZEBOX, WS_SYSMENU,
+        WS_VISIBLE,
     },
 };
 
@@ -76,36 +77,39 @@ bitflags! {
 bitflags! {
     pub struct WindowFlags: u32 {
         const RESIZABLE      = 1 << 0;
-        const DECORATIONS    = 1 << 1;
-        const VISIBLE        = 1 << 2;
-        const ON_TASKBAR     = 1 << 3;
-        const ALWAYS_ON_TOP  = 1 << 4;
-        const NO_BACK_BUFFER = 1 << 5;
-        const TRANSPARENT    = 1 << 6;
-        const CHILD          = 1 << 7;
-        const MAXIMIZED      = 1 << 8;
-        const POPUP          = 1 << 14;
+        const VISIBLE        = 1 << 1;
+        const ON_TASKBAR     = 1 << 2;
+        const ALWAYS_ON_TOP  = 1 << 3;
+        const NO_BACK_BUFFER = 1 << 4;
+        const TRANSPARENT    = 1 << 5;
+        const CHILD          = 1 << 6;
+        const MAXIMIZED      = 1 << 7;
+        const POPUP          = 1 << 8;
 
         /// Marker flag for fullscreen. Should always match `WindowState::fullscreen`, but is
         /// included here to make masking easier.
         const MARKER_EXCLUSIVE_FULLSCREEN = 1 << 9;
-        const MARKER_BORDERLESS_FULLSCREEN = 1 << 13;
+        const MARKER_BORDERLESS_FULLSCREEN = 1 << 10;
 
         /// The `WM_SIZE` event contains some parameters that can effect the state of `WindowFlags`.
         /// In most cases, it's okay to let those parameters change the state. However, when we're
         /// running the `WindowFlags::apply_diff` function, we *don't* want those parameters to
         /// effect our stored state, because the purpose of `apply_diff` is to update the actual
         /// window's state to match our stored state. This controls whether to accept those changes.
-        const MARKER_RETAIN_STATE_ON_SIZE = 1 << 10;
+        const MARKER_RETAIN_STATE_ON_SIZE = 1 << 11;
 
-        const MARKER_IN_SIZE_MOVE = 1 << 11;
+        const MARKER_IN_SIZE_MOVE = 1 << 12;
 
-        const MINIMIZED = 1 << 12;
+        const MINIMIZED = 1 << 13;
 
-        const IGNORE_CURSOR_EVENT = 1 << 15;
+        const IGNORE_CURSOR_EVENT = 1 << 14;
+
+        /// Fully decorated window (incl. caption, border and drop shadow).
+        const MARKER_DECORATIONS = 1 << 15;
+        /// Drop shadow for undecorated windows.
+        const MARKER_UNDECORATED_SHADOW = 1 << 16;
 
         const EXCLUSIVE_FULLSCREEN_OR_MASK = WindowFlags::ALWAYS_ON_TOP.bits;
-        const NO_DECORATIONS_AND_MASK = !WindowFlags::RESIZABLE.bits;
     }
 }
 
@@ -228,22 +232,22 @@ impl WindowFlags {
         if self.contains(WindowFlags::MARKER_EXCLUSIVE_FULLSCREEN) {
             self |= WindowFlags::EXCLUSIVE_FULLSCREEN_OR_MASK;
         }
-        if !self.contains(WindowFlags::DECORATIONS) {
-            self &= WindowFlags::NO_DECORATIONS_AND_MASK;
-        }
         self
     }
 
     pub fn to_window_styles(self) -> (WINDOW_STYLE, WINDOW_EX_STYLE) {
-        let (mut style, mut style_ex) = (WS_OVERLAPPED, WS_EX_LEFT);
+        // Required styles to properly support common window functionality like aero snap.
+        let mut style = WS_CAPTION
+            | WS_MINIMIZEBOX
+            | WS_BORDER
+            | WS_CLIPSIBLINGS
+            | WS_CLIPCHILDREN
+            | WS_SYSMENU;
+        let mut style_ex = WS_EX_WINDOWEDGE | WS_EX_ACCEPTFILES;
 
         if self.contains(WindowFlags::RESIZABLE) {
             style |= WS_SIZEBOX | WS_MAXIMIZEBOX;
         }
-        if self.contains(WindowFlags::DECORATIONS) {
-            style |= WS_CAPTION | WS_MINIMIZEBOX | WS_BORDER;
-            style_ex = WS_EX_WINDOWEDGE;
-        }
         if self.contains(WindowFlags::VISIBLE) {
             style |= WS_VISIBLE;
         }
@@ -272,9 +276,6 @@ impl WindowFlags {
             style_ex |= WS_EX_TRANSPARENT | WS_EX_LAYERED;
         }
 
-        style |= WS_CLIPSIBLINGS | WS_CLIPCHILDREN | WS_SYSMENU;
-        style_ex |= WS_EX_ACCEPTFILES;
-
         if self.intersects(
             WindowFlags::MARKER_EXCLUSIVE_FULLSCREEN | WindowFlags::MARKER_BORDERLESS_FULLSCREEN,
         ) {
@@ -379,11 +380,69 @@ impl WindowFlags {
             }
         }
     }
+
+    pub fn adjust_rect(self, hwnd: HWND, mut rect: RECT) -> Result<RECT, io::Error> {
+        unsafe {
+            let mut style = GetWindowLongW(hwnd, GWL_STYLE) as u32;
+            let style_ex = GetWindowLongW(hwnd, GWL_EXSTYLE) as u32;
+
+            // Frameless style implemented by manually overriding the non-client area in `WM_NCCALCSIZE`.
+            if !self.contains(WindowFlags::MARKER_DECORATIONS) {
+                style &= !(WS_CAPTION | WS_SIZEBOX);
+            }
+
+            util::win_to_err({
+                let b_menu = GetMenu(hwnd) != 0;
+                if let (Some(get_dpi_for_window), Some(adjust_window_rect_ex_for_dpi)) = (
+                    *util::GET_DPI_FOR_WINDOW,
+                    *util::ADJUST_WINDOW_RECT_EX_FOR_DPI,
+                ) {
+                    let dpi = get_dpi_for_window(hwnd);
+                    adjust_window_rect_ex_for_dpi(&mut rect, style, b_menu.into(), style_ex, dpi)
+                } else {
+                    AdjustWindowRectEx(&mut rect, style, b_menu.into(), style_ex)
+                }
+            })?;
+            Ok(rect)
+        }
+    }
+
+    pub fn adjust_size(self, hwnd: HWND, size: PhysicalSize<u32>) -> PhysicalSize<u32> {
+        let (width, height): (u32, u32) = size.into();
+        let rect = RECT {
+            left: 0,
+            right: width as i32,
+            top: 0,
+            bottom: height as i32,
+        };
+        let rect = self.adjust_rect(hwnd, rect).unwrap_or(rect);
+
+        let outer_x = (rect.right - rect.left).abs();
+        let outer_y = (rect.top - rect.bottom).abs();
+
+        PhysicalSize::new(outer_x as _, outer_y as _)
+    }
+
+    pub fn set_size(self, hwnd: HWND, size: PhysicalSize<u32>) {
+        unsafe {
+            let (width, height): (u32, u32) = self.adjust_size(hwnd, size).into();
+            SetWindowPos(
+                hwnd,
+                0,
+                0,
+                0,
+                width as _,
+                height as _,
+                SWP_ASYNCWINDOWPOS | SWP_NOZORDER | SWP_NOREPOSITION | SWP_NOMOVE | SWP_NOACTIVATE,
+            );
+            InvalidateRgn(hwnd, 0, false.into());
+        }
+    }
 }
 
 impl CursorFlags {
     fn refresh_os_cursor(self, window: HWND) -> Result<(), io::Error> {
-        let client_rect = util::get_client_rect(window)?;
+        let client_rect = util::WindowArea::Inner.get_rect(window)?;
 
         if util::is_focused(window) {
             let cursor_clip = match self.contains(CursorFlags::GRABBED) {