Document that multiple windows are not supported on Android

Co-authored-by: Kirill Chibisov <contact@kchibisov.com>

.github/workflows/ci.yml

@@ -89,7 +89,7 @@ jobs:
 
     - name: Generate lockfile
       # Also updates the crates.io index
-      run: cargo generate-lockfile
+      run: cargo generate-lockfile && cargo update -p ahash --precise 0.8.7
 
     - name: Install GCC Multilib
       if: (matrix.platform.os == 'ubuntu-latest') && contains(matrix.platform.target, 'i686')

CHANGELOG.md

@@ -11,7 +11,7 @@ Unreleased` header.
 
 # Unreleased
 
-- **Breaking:** Use `RequestIgnored` as the error type in `InnerSizeWriter::request_inner_size`.
+- On X11, don't require XIM to run.
 - Fix compatibility with 32-bit platforms without 64-bit atomics.
 - On X11, fix swapped instance and general class names.
 - **Breaking:** Removed unnecessary generic parameter `T` from `EventLoopWindowTarget`.
@@ -54,6 +54,22 @@ Unreleased` header.
 - On Orbital, fix `logical_key` and `text` not reported in `KeyEvent`.
 - On Orbital, implement `KeyEventExtModifierSupplement`.
 - On Orbital, map keys to `NamedKey` when possible.
+- On Orbital, implement `set_cursor_grab`.
+- On Orbital, implement `set_cursor_visible`.
+- On Orbital, implement `drag_window`.
+- On Orbital, implement `drag_resize_window`.
+- On Orbital, implement `set_transparent`.
+- On Orbital, implement `set_visible`.
+- On Orbital, implement `is_visible`.
+- On Orbital, implement `set_resizable`.
+- On Orbital, implement `is_resizable`.
+- On Orbital, implement `set_maximized`.
+- On Orbital, implement `is_maximized`.
+- On Orbital, implement `set_decorations`.
+- On Orbital, implement `is_decorated`.
+- On Orbital, implement `set_window_level`.
+- On Orbital, emit `DeviceEvent::MouseMotion`.
+- On Wayland, fix title in CSD not updated from `AboutToWait`.
 
 # 0.29.10
 

src/event.rs

@@ -32,8 +32,6 @@
 //!
 //! [`EventLoop::run(...)`]: crate::event_loop::EventLoop::run
 //! [`ControlFlow::WaitUntil`]: crate::event_loop::ControlFlow::WaitUntil
-use std::error::Error;
-use std::fmt;
 use std::path::PathBuf;
 use std::sync::{Mutex, Weak};
 #[cfg(not(web_platform))]
@@ -45,6 +43,7 @@ use smol_str::SmolStr;
 #[cfg(web_platform)]
 use web_time::Instant;
 
+use crate::error::ExternalError;
 #[cfg(doc)]
 use crate::window::Window;
 use crate::{
@@ -537,9 +536,8 @@ pub enum WindowEvent {
     /// * Changing the display's scale factor (e.g. in Control Panel on Windows).
     /// * Moving the window to a display with a different scale factor.
     ///
-    /// After this event callback has been processed, the window will be resized to whatever value
-    /// is pointed to by the `new_inner_size` reference. By default, this will contain the size suggested
-    /// by the OS, but it can be changed to any value.
+    /// To update the window size, use the provided [`InnerSizeWriter`] handle. By default, the window is
+    /// resized to the value suggested by the OS, but it can be changed to any value.
     ///
     /// For more information about DPI in general, see the [`dpi`](crate::dpi) module.
     ScaleFactorChanged {
@@ -1127,23 +1125,16 @@ impl InnerSizeWriter {
         Self { new_inner_size }
     }
 
-    /// Try to request a new inner size which will be set synchronously on the
-    /// window.
-    ///
-    ///
-    /// # Errors
-    ///
-    /// This method returns an error when the request was ignored because it
-    /// was done asynchronously, outside the event loop callback.
+    /// Try to request inner size which will be set synchroniously on the window.
     pub fn request_inner_size(
         &mut self,
         new_inner_size: PhysicalSize<u32>,
-    ) -> Result<(), RequestIgnored> {
+    ) -> Result<(), ExternalError> {
         if let Some(inner) = self.new_inner_size.upgrade() {
             *inner.lock().unwrap() = new_inner_size;
             Ok(())
         } else {
-            Err(RequestIgnored { _priv: () })
+            Err(ExternalError::Ignored)
         }
     }
 }
@@ -1154,22 +1145,6 @@ impl PartialEq for InnerSizeWriter {
     }
 }
 
-/// The request to change the inner size synchronously was ignored.
-///
-/// See [`InnerSizeWriter::request_inner_size`] for details.
-#[derive(Debug, Clone)] // Explicitly not other traits, in case we want to extend it in the future
-pub struct RequestIgnored {
-    _priv: (),
-}
-
-impl fmt::Display for RequestIgnored {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
-        f.write_str("the request to change the inner size was ignored")
-    }
-}
-
-impl Error for RequestIgnored {}
-
 #[cfg(test)]
 mod tests {
     use crate::event;

src/platform_impl/linux/common/xkb_state.rs

@@ -498,7 +498,7 @@ impl<'a> KeyEventResults<'a> {
         }
     }
 
-    fn physical_key(&mut self) -> PhysicalKey {
+    fn physical_key(&self) -> PhysicalKey {
         keymap::raw_keycode_to_physicalkey(self.keycode)
     }
 
@@ -553,6 +553,7 @@ impl<'a> KeyEventResults<'a> {
         } else {
             0
         };
+
         self.keysym_to_key(keysym)
             .unwrap_or_else(|(key, location)| {
                 (
@@ -565,7 +566,7 @@ impl<'a> KeyEventResults<'a> {
             })
     }
 
-    fn keysym_to_key(&mut self, keysym: u32) -> Result<(Key, KeyLocation), (Key, KeyLocation)> {
+    fn keysym_to_key(&self, keysym: u32) -> Result<(Key, KeyLocation), (Key, KeyLocation)> {
         let location = super::keymap::keysym_location(keysym);
         let key = super::keymap::keysym_to_key(keysym);
         if matches!(key, Key::Unidentified(_)) {

src/platform_impl/linux/mod.rs

@@ -940,10 +940,12 @@ impl EventLoopWindowTarget {
         }
     }
 
+    #[allow(dead_code)]
     fn set_exit_code(&self, code: i32) {
         x11_or_wayland!(match self; Self(evlp) => evlp.set_exit_code(code))
     }
 
+    #[allow(dead_code)]
     fn exit_code(&self) -> Option<i32> {
         x11_or_wayland!(match self; Self(evlp) => evlp.exit_code())
     }

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

@@ -461,19 +461,19 @@ impl<T: 'static> EventLoop<T> {
             window_ids.extend(state.window_requests.get_mut().keys());
         });
 
-        for window_id in window_ids.drain(..) {
+        for window_id in window_ids.iter() {
             let event = 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));
+                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);
                 }
 
                 let mut window = state
                     .windows
                     .get_mut()
-                    .get_mut(&window_id)
+                    .get_mut(window_id)
                     .unwrap()
                     .lock()
                     .unwrap();
@@ -485,7 +485,7 @@ impl<T: 'static> EventLoop<T> {
                 // Reset the frame callbacks state.
                 window.frame_callback_reset();
                 let mut redraw_requested = window_requests
-                    .get(&window_id)
+                    .get(window_id)
                     .unwrap()
                     .take_redraw_requested();
 
@@ -498,7 +498,7 @@ impl<T: 'static> EventLoop<T> {
             if let Some(event) = event {
                 callback(
                     Event::WindowEvent {
-                        window_id: crate::window::WindowId(window_id),
+                        window_id: crate::window::WindowId(*window_id),
                         event,
                     },
                     &self.window_target,
@@ -514,6 +514,42 @@ impl<T: 'static> EventLoop<T> {
         // This is always the last event we dispatch before poll again
         callback(Event::AboutToWait, &self.window_target);
 
+        // Update the window frames and schedule redraws.
+        let mut wake_up = false;
+        for window_id in window_ids.drain(..) {
+            wake_up |= self.with_state(|state| match state.windows.get_mut().get_mut(&window_id) {
+                Some(window) => {
+                    let refresh = window.lock().unwrap().refresh_frame();
+                    if refresh {
+                        state
+                            .window_requests
+                            .get_mut()
+                            .get_mut(&window_id)
+                            .unwrap()
+                            .redraw_requested
+                            .store(true, Ordering::Relaxed);
+                    }
+
+                    refresh
+                }
+                None => false,
+            });
+        }
+
+        // Wakeup event loop if needed.
+        //
+        // If the user draws from the `AboutToWait` this is likely not required, however
+        // we can't do much about it.
+        if wake_up {
+            match &self.window_target.p {
+                PlatformEventLoopWindowTarget::Wayland(window_target) => {
+                    window_target.event_loop_awakener.ping();
+                }
+                #[cfg(x11_platform)]
+                PlatformEventLoopWindowTarget::X(_) => unreachable!(),
+            }
+        }
+
         std::mem::swap(&mut self.compositor_updates, &mut compositor_updates);
         std::mem::swap(&mut self.buffer_sink, &mut buffer_sink);
         std::mem::swap(&mut self.window_ids, &mut window_ids);

src/platform_impl/linux/x11/atoms.rs

@@ -6,7 +6,7 @@ macro_rules! atom_manager {
     ($($name:ident $(:$lit:literal)?),*) => {
         x11rb::atom_manager! {
             /// The atoms used by `winit`
-            pub(crate) Atoms: AtomsCookie {
+            pub Atoms: AtomsCookie {
                 $($name $(:$lit)?,)*
             }
         }
@@ -14,7 +14,7 @@ macro_rules! atom_manager {
         /// Indices into the `Atoms` struct.
         #[derive(Copy, Clone, Debug)]
         #[allow(non_camel_case_types)]
-        pub(crate) enum AtomName {
+        pub enum AtomName {
             $($name,)*
         }
 

src/platform_impl/linux/x11/dnd.rs

@@ -41,7 +41,7 @@ impl From<io::Error> for DndDataParseError {
     }
 }
 
-pub(crate) struct Dnd {
+pub struct Dnd {
     xconn: Arc<XConnection>,
     // Populated by XdndEnter event handler
     pub version: Option<c_long>,

src/platform_impl/linux/x11/mod.rs

@@ -1,72 +1,33 @@
 #![cfg(x11_platform)]
 
-mod activation;
-mod atoms;
-mod dnd;
-mod event_processor;
-pub mod ffi;
-mod ime;
-mod monitor;
-pub mod util;
-mod window;
-mod xdisplay;
-mod xsettings;
-
-pub(crate) use self::{
-    monitor::{MonitorHandle, VideoModeHandle},
-    window::UnownedWindow,
-    xdisplay::{XConnection, XError, XNotSupported},
-};
+use std::cell::{Cell, RefCell};
+use std::collections::{HashMap, HashSet};
+use std::ffi::CStr;
+use std::fmt;
+use std::marker::PhantomData;
+use std::mem::MaybeUninit;
+use std::ops::Deref;
+use std::os::raw::*;
+use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, RawFd};
+use std::sync::mpsc::{self, Receiver, Sender, TryRecvError};
+use std::sync::{Arc, Weak};
+use std::time::{Duration, Instant};
+use std::{ptr, slice, str};
 
 use calloop::generic::Generic;
 use calloop::EventLoop as Loop;
 use calloop::{ping::Ping, Readiness};
+use libc::{self, setlocale, LC_CTYPE};
 use log::warn;
 
-use std::{
-    cell::{Cell, RefCell},
-    collections::{HashMap, HashSet},
-    ffi::CStr,
-    fmt,
-    marker::PhantomData,
-    mem::MaybeUninit,
-    ops::Deref,
-    os::{
-        raw::*,
-        unix::io::{AsFd, AsRawFd, BorrowedFd, RawFd},
-    },
-    ptr,
-    rc::Rc,
-    slice, str,
-    sync::mpsc::{Receiver, Sender, TryRecvError},
-    sync::{mpsc, Arc, Weak},
-    time::{Duration, Instant},
-};
-
-use libc::{self, setlocale, LC_CTYPE};
-
-use atoms::*;
-
+use x11rb::connection::RequestConnection;
+use x11rb::errors::{ConnectError, ConnectionError, IdsExhausted, ReplyError};
+use x11rb::protocol::xinput::{self, ConnectionExt as _};
+use x11rb::protocol::xkb;
+use x11rb::protocol::xproto::{self, ConnectionExt as _};
 use x11rb::x11_utils::X11Error as LogicalError;
-use x11rb::{
-    connection::RequestConnection,
-    protocol::{
-        xinput::{self, ConnectionExt as _},
-        xkb,
-        xproto::{self, ConnectionExt as _},
-    },
-};
-use x11rb::{
-    errors::{ConnectError, ConnectionError, IdsExhausted, ReplyError},
-    xcb_ffi::ReplyOrIdError,
-};
+use x11rb::xcb_ffi::ReplyOrIdError;
 
-pub(super) use self::util::CustomCursor;
-use self::{
-    dnd::{Dnd, DndState},
-    event_processor::EventProcessor,
-    ime::{Ime, ImeCreationError, ImeReceiver, ImeRequest, ImeSender},
-};
 use super::{common::xkb_state::KbdState, ControlFlow, OsError};
 use crate::{
     error::{EventLoopError, OsError as RootOsError},
@@ -77,6 +38,28 @@ use crate::{
     window::WindowAttributes,
 };
 
+mod activation;
+mod atoms;
+mod dnd;
+mod event_processor;
+pub mod ffi;
+mod ime;
+mod monitor;
+mod util;
+mod window;
+mod xdisplay;
+mod xsettings;
+
+use atoms::*;
+use dnd::{Dnd, DndState};
+use event_processor::EventProcessor;
+use ime::{Ime, ImeCreationError, ImeReceiver, ImeRequest, ImeSender};
+pub(crate) use monitor::{MonitorHandle, VideoModeHandle};
+use window::UnownedWindow;
+pub(crate) use xdisplay::{XConnection, XError, XNotSupported};
+
+pub use util::CustomCursor;
+
 // Xinput constants not defined in x11rb
 const ALL_DEVICES: u16 = 0;
 const ALL_MASTER_DEVICES: u16 = 1;
@@ -150,7 +133,7 @@ pub struct EventLoopWindowTarget {
     control_flow: Cell<ControlFlow>,
     exit: Cell<Option<i32>>,
     root: xproto::Window,
-    ime: RefCell<Ime>,
+    ime: Option<RefCell<Ime>>,
     windows: RefCell<HashMap<WindowId, Weak<UnownedWindow>>>,
     redraw_sender: WakeSender<WindowId>,
     activation_sender: WakeSender<ActivationToken>,
@@ -166,7 +149,6 @@ pub struct EventLoop<T: 'static> {
     user_receiver: PeekableReceiver<T>,
     activation_receiver: PeekableReceiver<ActivationToken>,
     user_sender: Sender<T>,
-    target: Rc<RootELW>,
 
     /// The current state of the event loop.
     state: EventLoopState,
@@ -227,13 +209,15 @@ impl<T: 'static> EventLoop<T> {
                 setlocale(LC_CTYPE, default_locale);
             }
         }
-        let ime = RefCell::new({
-            let result = Ime::new(Arc::clone(&xconn), ime_event_sender);
-            if let Err(ImeCreationError::OpenFailure(ref state)) = result {
-                panic!("Failed to open input method: {state:#?}");
-            }
-            result.expect("Failed to set input method destruction callback")
-        });
+
+        let ime = Ime::new(Arc::clone(&xconn), ime_event_sender);
+        if let Err(ImeCreationError::OpenFailure(state)) = ime.as_ref() {
+            warn!("Failed to open input method: {state:#?}");
+        } else if let Err(err) = ime.as_ref() {
+            warn!("Failed to set input method destruction callback: {err:?}");
+        }
+
+        let ime = ime.ok().map(RefCell::new);
 
         let randr_event_offset = xconn
             .select_xrandr_input(root)
@@ -324,13 +308,13 @@ impl<T: 'static> EventLoop<T> {
         // Set initial device event filter.
         window_target.update_listen_device_events(true);
 
-        let target = Rc::new(RootELW {
+        let root_window_target = RootELW {
             p: super::EventLoopWindowTarget::X(window_target),
             _marker: PhantomData,
-        });
+        };
 
         let event_processor = EventProcessor {
-            target: target.clone(),
+            target: root_window_target,
             dnd,
             devices: Default::default(),
             randr_event_offset,
@@ -349,8 +333,9 @@ impl<T: 'static> EventLoop<T> {
 
         // Register for device hotplug events
         // (The request buffer is flushed during `init_device`)
-        get_xtarget(&target)
-            .xconn
+        let xconn = &EventProcessor::window_target(&event_processor.target).xconn;
+
+        xconn
             .select_xinput_events(
                 root,
                 ALL_DEVICES,
@@ -358,8 +343,7 @@ impl<T: 'static> EventLoop<T> {
             )
             .expect_then_ignore_error("Failed to register for XInput2 device hotplug events");
 
-        get_xtarget(&target)
-            .xconn
+        xconn
             .select_xkb_events(
                 0x100, // Use the "core keyboard device"
                 xkb::EventType::NEW_KEYBOARD_NOTIFY
@@ -379,7 +363,6 @@ impl<T: 'static> EventLoop<T> {
             activation_receiver: PeekableReceiver::from_recv(activation_token_channel),
             user_receiver: PeekableReceiver::from_recv(user_channel),
             user_sender,
-            target,
             state: EventLoopState {
                 x11_readiness: Readiness::EMPTY,
             },
@@ -396,7 +379,7 @@ impl<T: 'static> EventLoop<T> {
     }
 
     pub(crate) fn window_target(&self) -> &RootELW {
-        &self.target
+        &self.event_processor.target
     }
 
     pub fn run_on_demand<F>(&mut self, mut event_handler: F) -> Result<(), EventLoopError>
@@ -421,7 +404,7 @@ impl<T: 'static> EventLoop<T> {
         // `run_on_demand` calls but if they have only just dropped their
         // windows we need to make sure those last requests are sent to the
         // X Server.
-        let wt = get_xtarget(&self.target);
+        let wt = EventProcessor::window_target(&self.event_processor.target);
         wt.x_connection().sync_with_server().map_err(|x_err| {
             EventLoopError::Os(os_error!(OsError::XError(Arc::new(X11Error::Xlib(x_err)))))
         })?;
@@ -544,12 +527,12 @@ impl<T: 'static> EventLoop<T> {
     where
         F: FnMut(Event<T>, &RootELW),
     {
-        callback(crate::event::Event::NewEvents(cause), &self.target);
+        callback(Event::NewEvents(cause), &self.event_processor.target);
 
         // NB: For consistency all platforms must emit a 'resumed' event even though X11
         // applications don't themselves have a formal suspend/resume lifecycle.
         if cause == StartCause::Init {
-            callback(crate::event::Event::Resumed, &self.target);
+            callback(Event::Resumed, &self.event_processor.target);
         }
 
         // Process all pending events
@@ -564,16 +547,16 @@ impl<T: 'static> EventLoop<T> {
                 });
 
             match token {
-                Some(Ok(token)) => callback(
-                    crate::event::Event::WindowEvent {
+                Some(Ok(token)) => {
+                    let event = Event::WindowEvent {
                         window_id: crate::window::WindowId(window_id),
-                        event: crate::event::WindowEvent::ActivationTokenDone {
+                        event: WindowEvent::ActivationTokenDone {
                             serial,
                             token: crate::window::ActivationToken::_new(token),
                         },
-                    },
-                    &self.target,
-                ),
+                    };
+                    callback(event, &self.event_processor.target)
+                }
                 Some(Err(e)) => {
                     log::error!("Failed to get activation token: {}", e);
                 }
@@ -584,7 +567,7 @@ impl<T: 'static> EventLoop<T> {
         // Empty the user event buffer
         {
             while let Ok(event) = self.user_receiver.try_recv() {
-                callback(crate::event::Event::UserEvent(event), &self.target);
+                callback(Event::UserEvent(event), &self.event_processor.target);
             }
         }
 
@@ -603,14 +586,14 @@ impl<T: 'static> EventLoop<T> {
                         window_id,
                         event: WindowEvent::RedrawRequested,
                     },
-                    &self.target,
+                    &self.event_processor.target,
                 );
             }
         }
 
         // This is always the last event we dispatch before poll again
         {
-            callback(crate::event::Event::AboutToWait, &self.target);
+            callback(Event::AboutToWait, &self.event_processor.target);
         }
     }
 
@@ -618,40 +601,44 @@ impl<T: 'static> EventLoop<T> {
     where
         F: FnMut(Event<T>, &RootELW),
     {
-        let target = &self.target;
         let mut xev = MaybeUninit::uninit();
-        let wt = get_xtarget(&self.target);
 
         while unsafe { self.event_processor.poll_one_event(xev.as_mut_ptr()) } {
             let mut xev = unsafe { xev.assume_init() };
-            self.event_processor.process_event(&mut xev, |event| {
-                if let Event::WindowEvent {
-                    window_id: crate::window::WindowId(wid),
-                    event: WindowEvent::RedrawRequested,
-                } = event
-                {
-                    wt.redraw_sender.send(wid).unwrap();
-                } else {
-                    callback(event, target);
-                }
-            });
+            self.event_processor
+                .process_event(&mut xev, |window_target, event| {
+                    if let Event::WindowEvent {
+                        window_id: crate::window::WindowId(wid),
+                        event: WindowEvent::RedrawRequested,
+                    } = event
+                    {
+                        let window_target = EventProcessor::window_target(window_target);
+                        window_target.redraw_sender.send(wid).unwrap();
+                    } else {
+                        callback(event, window_target);
+                    }
+                });
         }
     }
 
     fn control_flow(&self) -> ControlFlow {
-        self.target.p.control_flow()
+        let window_target = EventProcessor::window_target(&self.event_processor.target);
+        window_target.control_flow()
     }
 
     fn exiting(&self) -> bool {
-        self.target.p.exiting()
+        let window_target = EventProcessor::window_target(&self.event_processor.target);
+        window_target.exiting()
     }
 
     fn set_exit_code(&self, code: i32) {
-        self.target.p.set_exit_code(code)
+        let window_target = EventProcessor::window_target(&self.event_processor.target);
+        window_target.set_exit_code(code);
     }
 
     fn exit_code(&self) -> Option<i32> {
-        self.target.p.exit_code()
+        let window_target = EventProcessor::window_target(&self.event_processor.target);
+        window_target.exit_code()
     }
 }
 
@@ -667,14 +654,6 @@ impl<T> AsRawFd for EventLoop<T> {
     }
 }
 
-pub(crate) fn get_xtarget(target: &RootELW) -> &EventLoopWindowTarget {
-    match target.p {
-        super::EventLoopWindowTarget::X(ref target) => target,
-        #[cfg(wayland_platform)]
-        _ => unreachable!(),
-    }
-}
-
 impl EventLoopWindowTarget {
     /// Returns the `XConnection` of this events loop.
     #[inline]
@@ -1048,7 +1027,7 @@ fn mkdid(w: xinput::DeviceId) -> crate::event::DeviceId {
 }
 
 #[derive(Debug)]
-struct Device {
+pub struct Device {
     _name: String,
     scroll_axes: Vec<(i32, ScrollAxis)>,
     // For master devices, this is the paired device (pointer <-> keyboard).

src/platform_impl/linux/x11/monitor.rs

@@ -324,7 +324,7 @@ impl XConnection {
     }
 }
 
-pub(crate) struct ScreenResources {
+pub struct ScreenResources {
     /// List of attached modes.
     modes: Vec<randr::ModeInfo>,
 

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

@@ -39,11 +39,13 @@ impl XConnection {
     // Retrieve DPI from Xft.dpi property
     pub fn get_xft_dpi(&self) -> Option<f64> {
         // Try to get it from XSETTINGS first.
-        match self.xsettings_dpi() {
-            Ok(Some(dpi)) => return Some(dpi),
-            Ok(None) => {}
-            Err(err) => {
-                log::warn!("failed to fetch XSettings: {err}");
+        if let Some(xsettings_screen) = self.xsettings_screen() {
+            match self.xsettings_dpi(xsettings_screen) {
+                Ok(Some(dpi)) => return Some(dpi),
+                Ok(None) => {}
+                Err(err) => {
+                    log::warn!("failed to fetch XSettings: {err}");
+                }
             }
         }
 

src/platform_impl/linux/x11/window.rs

@@ -123,7 +123,7 @@ impl SharedState {
 unsafe impl Send for UnownedWindow {}
 unsafe impl Sync for UnownedWindow {}
 
-pub(crate) struct UnownedWindow {
+pub struct UnownedWindow {
     pub(crate) xconn: Arc<XConnection>, // never changes
     xwindow: xproto::Window,            // never changes
     #[allow(dead_code)]
@@ -555,9 +555,9 @@ impl UnownedWindow {
             leap!(xconn.select_xinput_events(window.xwindow, super::ALL_MASTER_DEVICES, mask))
                 .ignore_error();
 
-            {
-                let result = event_loop
-                    .ime
+            // Try to create input context for the window.
+            if let Some(ime) = event_loop.ime.as_ref() {
+                let result = ime
                     .borrow_mut()
                     .create_context(window.xwindow as ffi::Window, false);
                 leap!(result);

src/platform_impl/linux/x11/xdisplay.rs

@@ -22,7 +22,7 @@ use x11rb::{
 };
 
 /// A connection to an X server.
-pub(crate) struct XConnection {
+pub struct XConnection {
     pub xlib: ffi::Xlib,
     pub xcursor: ffi::Xcursor,
 
@@ -59,7 +59,7 @@ pub(crate) struct XConnection {
     randr_version: (u32, u32),
 
     /// Atom for the XSettings screen.
-    xsettings_screen: xproto::Atom,
+    xsettings_screen: Option<xproto::Atom>,
 
     pub latest_error: Mutex<Option<XError>>,
     pub cursor_cache: Mutex<HashMap<Option<CursorIcon>, ffi::Cursor>>,
@@ -108,21 +108,6 @@ impl XConnection {
         // Get the default screen.
         let default_screen = unsafe { (xlib.XDefaultScreen)(display) } as usize;
 
-        // Fetch the _XSETTINGS_S[screen number] atom.
-        let xsettings_screen = xcb
-            .intern_atom(false, format!("_XSETTINGS_S{}", default_screen).as_bytes())
-            .map_err(|e| XNotSupported::XcbConversionError(Arc::new(e)))?;
-
-        // Fetch the other atoms.
-        let atoms = Atoms::new(&xcb)
-            .map_err(|e| XNotSupported::XcbConversionError(Arc::new(e)))?
-            .reply()
-            .map_err(|e| XNotSupported::XcbConversionError(Arc::new(e)))?;
-        let xsettings_screen = xsettings_screen
-            .reply()
-            .map_err(|e| XNotSupported::XcbConversionError(Arc::new(e)))?
-            .atom;
-
         // Load the database.
         let database = resource_manager::new_from_default(&xcb)
             .map_err(|e| XNotSupported::XcbConversionError(Arc::new(e)))?;
@@ -134,23 +119,16 @@ impl XConnection {
             .reply()
             .expect("failed to query XRandR version");
 
-        // Get PropertyNotify events from the XSETTINGS window.
-        // TODO: The XSETTINGS window here can change. In the future, listen for DestroyNotify on this window
-        // in order to accomodate for a changed window here.
-        let selector_window = xcb
-            .get_selection_owner(xsettings_screen)
+        let xsettings_screen = Self::new_xsettings_screen(&xcb, default_screen);
+        if xsettings_screen.is_none() {
+            log::warn!("error setting XSETTINGS; Xft options won't reload automatically")
+        }
+
+        // Fetch atoms.
+        let atoms = Atoms::new(&xcb)
             .map_err(|e| XNotSupported::XcbConversionError(Arc::new(e)))?
             .reply()
-            .map_err(|e| XNotSupported::XcbConversionError(Arc::new(e)))?
-            .owner;
-        xcb.change_window_attributes(
-            selector_window,
-            &xproto::ChangeWindowAttributesAux::new()
-                .event_mask(xproto::EventMask::PROPERTY_CHANGE),
-        )
-        .map_err(|e| XNotSupported::XcbConversionError(Arc::new(e)))?
-        .check()
-        .map_err(|e| XNotSupported::XcbConversionError(Arc::new(e)))?;
+            .map_err(|e| XNotSupported::XcbConversionError(Arc::new(e)))?;
 
         Ok(XConnection {
             xlib,
@@ -170,6 +148,37 @@ impl XConnection {
         })
     }
 
+    fn new_xsettings_screen(xcb: &XCBConnection, default_screen: usize) -> Option<xproto::Atom> {
+        // Fetch the _XSETTINGS_S[screen number] atom.
+        let xsettings_screen = xcb
+            .intern_atom(false, format!("_XSETTINGS_S{}", default_screen).as_bytes())
+            .ok()?
+            .reply()
+            .ok()?
+            .atom;
+
+        // Get PropertyNotify events from the XSETTINGS window.
+        // TODO: The XSETTINGS window here can change. In the future, listen for DestroyNotify on this window
+        // in order to accomodate for a changed window here.
+        let selector_window = xcb
+            .get_selection_owner(xsettings_screen)
+            .ok()?
+            .reply()
+            .ok()?
+            .owner;
+
+        xcb.change_window_attributes(
+            selector_window,
+            &xproto::ChangeWindowAttributesAux::new()
+                .event_mask(xproto::EventMask::PROPERTY_CHANGE),
+        )
+        .ok()?
+        .check()
+        .ok()?;
+
+        Some(xsettings_screen)
+    }
+
     /// Checks whether an error has been triggered by the previous function calls.
     #[inline]
     pub fn check_errors(&self) -> Result<(), XError> {
@@ -258,7 +267,7 @@ impl XConnection {
 
     /// Get the atom for Xsettings.
     #[inline]
-    pub fn xsettings_screen(&self) -> u32 {
+    pub fn xsettings_screen(&self) -> Option<xproto::Atom> {
         self.xsettings_screen
     }
 }
@@ -300,7 +309,7 @@ impl fmt::Display for XError {
 
 /// Error returned if this system doesn't have XLib or can't create an X connection.
 #[derive(Clone, Debug)]
-pub(crate) enum XNotSupported {
+pub enum XNotSupported {
     /// Failed to load one or several shared libraries.
     LibraryOpenError(ffi::OpenError),
 

src/platform_impl/linux/x11/xsettings.rs

@@ -4,13 +4,13 @@
 //!
 //! [here]: https://github.com/derat/xsettingsd
 
-use super::{atoms::*, XConnection};
-
-use x11rb::protocol::xproto::ConnectionExt;
-
 use std::iter;
 use std::num::NonZeroUsize;
 
+use x11rb::protocol::xproto::{self, ConnectionExt};
+
+use super::{atoms::*, XConnection};
+
 type Result<T> = core::result::Result<T, ParserError>;
 
 const DPI_NAME: &[u8] = b"Xft/DPI";
@@ -20,13 +20,16 @@ const BIG_ENDIAN: u8 = b'B';
 
 impl XConnection {
     /// Get the DPI from XSettings.
-    pub(crate) fn xsettings_dpi(&self) -> core::result::Result<Option<f64>, super::X11Error> {
+    pub(crate) fn xsettings_dpi(
+        &self,
+        xsettings_screen: xproto::Atom,
+    ) -> core::result::Result<Option<f64>, super::X11Error> {
         let atoms = self.atoms();
 
         // Get the current owner of the screen's settings.
         let owner = self
             .xcb_connection()
-            .get_selection_owner(self.xsettings_screen())?
+            .get_selection_owner(xsettings_screen)?
             .reply()?;
 
         // Read the _XSETTINGS_SETTINGS property.

src/platform_impl/orbital/event_loop.rs

@@ -9,8 +9,8 @@ use std::{
 
 use bitflags::bitflags;
 use orbclient::{
-    ButtonEvent, EventOption, FocusEvent, HoverEvent, KeyEvent, MouseEvent, MoveEvent, QuitEvent,
-    ResizeEvent, ScrollEvent, TextInputEvent,
+    ButtonEvent, EventOption, FocusEvent, HoverEvent, KeyEvent, MouseEvent, MouseRelativeEvent,
+    MoveEvent, QuitEvent, ResizeEvent, ScrollEvent, TextInputEvent,
 };
 use smol_str::SmolStr;
 
@@ -457,6 +457,14 @@ impl<T: 'static> EventLoop<T> {
                     },
                 });
             }
+            EventOption::MouseRelative(MouseRelativeEvent { dx, dy }) => {
+                event_handler(event::Event::DeviceEvent {
+                    device_id: event::DeviceId(DeviceId),
+                    event: event::DeviceEvent::MouseMotion {
+                        delta: (dx as f64, dy as f64),
+                    },
+                });
+            }
             EventOption::Button(ButtonEvent {
                 left,
                 middle,
@@ -510,7 +518,7 @@ impl<T: 'static> EventLoop<T> {
                 // Acknowledge resize after event loop.
                 event_state.resize_opt = Some((width, height));
             }
-            //TODO: Clipboard
+            //TODO: Screen, Clipboard, Drop
             EventOption::Hover(HoverEvent { entered }) => {
                 if entered {
                     event_handler(event::Event::WindowEvent {

src/platform_impl/orbital/window.rs

@@ -13,7 +13,8 @@ use crate::{
 };
 
 use super::{
-    EventLoopWindowTarget, MonitorHandle, RedoxSocket, TimeSocket, WindowId, WindowProperties,
+    EventLoopWindowTarget, MonitorHandle, OsError, RedoxSocket, TimeSocket, WindowId,
+    WindowProperties,
 };
 
 // These values match the values uses in the `window_new` function in orbital:
@@ -21,7 +22,9 @@ use super::{
 const ORBITAL_FLAG_ASYNC: char = 'a';
 const ORBITAL_FLAG_BACK: char = 'b';
 const ORBITAL_FLAG_FRONT: char = 'f';
+const ORBITAL_FLAG_HIDDEN: char = 'h';
 const ORBITAL_FLAG_BORDERLESS: char = 'l';
+const ORBITAL_FLAG_MAXIMIZED: char = 'm';
 const ORBITAL_FLAG_RESIZABLE: char = 'r';
 const ORBITAL_FLAG_TRANSPARENT: char = 't';
 
@@ -57,11 +60,15 @@ impl Window {
         // Async by default.
         let mut flag_str = ORBITAL_FLAG_ASYNC.to_string();
 
+        if attrs.maximized {
+            flag_str.push(ORBITAL_FLAG_MAXIMIZED);
+        }
+
         if attrs.resizable {
             flag_str.push(ORBITAL_FLAG_RESIZABLE);
         }
 
-        //TODO: maximized, fullscreen, visible
+        //TODO: fullscreen
 
         if attrs.transparent {
             flag_str.push(ORBITAL_FLAG_TRANSPARENT);
@@ -71,6 +78,10 @@ impl Window {
             flag_str.push(ORBITAL_FLAG_BORDERLESS);
         }
 
+        if !attrs.visible {
+            flag_str.push(ORBITAL_FLAG_HIDDEN);
+        }
+
         match attrs.window_level {
             window::WindowLevel::AlwaysOnBottom => {
                 flag_str.push(ORBITAL_FLAG_BACK);
@@ -129,6 +140,23 @@ impl Window {
         f(self)
     }
 
+    fn get_flag(&self, flag: char) -> Result<bool, error::ExternalError> {
+        let mut buf: [u8; 4096] = [0; 4096];
+        let path = self
+            .window_socket
+            .fpath(&mut buf)
+            .map_err(|err| error::ExternalError::Os(os_error!(OsError::new(err))))?;
+        let properties = WindowProperties::new(path);
+        Ok(properties.flags.contains(flag))
+    }
+
+    fn set_flag(&self, flag: char, value: bool) -> Result<(), error::ExternalError> {
+        self.window_socket
+            .write(format!("F,{flag},{}", if value { 1 } else { 0 }).as_bytes())
+            .map_err(|err| error::ExternalError::Os(os_error!(OsError::new(err))))?;
+        Ok(())
+    }
+
     #[inline]
     pub fn id(&self) -> WindowId {
         WindowId {
@@ -254,17 +282,21 @@ impl Window {
     }
 
     #[inline]
-    pub fn set_transparent(&self, _transparent: bool) {}
+    pub fn set_transparent(&self, transparent: bool) {
+        let _ = self.set_flag(ORBITAL_FLAG_TRANSPARENT, transparent);
+    }
 
     #[inline]
     pub fn set_blur(&self, _blur: bool) {}
 
     #[inline]
-    pub fn set_visible(&self, _visibility: bool) {}
+    pub fn set_visible(&self, visible: bool) {
+        let _ = self.set_flag(ORBITAL_FLAG_HIDDEN, !visible);
+    }
 
     #[inline]
     pub fn is_visible(&self) -> Option<bool> {
-        None
+        Some(!self.get_flag(ORBITAL_FLAG_HIDDEN).unwrap_or(false))
     }
 
     #[inline]
@@ -276,17 +308,13 @@ impl Window {
     pub fn set_resize_increments(&self, _increments: Option<Size>) {}
 
     #[inline]
-    pub fn set_resizable(&self, _resizeable: bool) {}
+    pub fn set_resizable(&self, resizeable: bool) {
+        let _ = self.set_flag(ORBITAL_FLAG_RESIZABLE, resizeable);
+    }
 
     #[inline]
     pub fn is_resizable(&self) -> bool {
-        let mut buf: [u8; 4096] = [0; 4096];
-        let path = self
-            .window_socket
-            .fpath(&mut buf)
-            .expect("failed to read properties");
-        let properties = WindowProperties::new(path);
-        properties.flags.contains(ORBITAL_FLAG_RESIZABLE)
+        self.get_flag(ORBITAL_FLAG_RESIZABLE).unwrap_or(false)
     }
 
     #[inline]
@@ -298,11 +326,13 @@ impl Window {
     }
 
     #[inline]
-    pub fn set_maximized(&self, _maximized: bool) {}
+    pub fn set_maximized(&self, maximized: bool) {
+        let _ = self.set_flag(ORBITAL_FLAG_MAXIMIZED, maximized);
+    }
 
     #[inline]
     pub fn is_maximized(&self) -> bool {
-        false
+        self.get_flag(ORBITAL_FLAG_MAXIMIZED).unwrap_or(false)
     }
 
     #[inline]
@@ -314,21 +344,30 @@ impl Window {
     }
 
     #[inline]
-    pub fn set_decorations(&self, _decorations: bool) {}
-
-    #[inline]
-    pub fn is_decorated(&self) -> bool {
-        let mut buf: [u8; 4096] = [0; 4096];
-        let path = self
-            .window_socket
-            .fpath(&mut buf)
-            .expect("failed to read properties");
-        let properties = WindowProperties::new(path);
-        !properties.flags.contains(ORBITAL_FLAG_BORDERLESS)
+    pub fn set_decorations(&self, decorations: bool) {
+        let _ = self.set_flag(ORBITAL_FLAG_BORDERLESS, !decorations);
     }
 
     #[inline]
-    pub fn set_window_level(&self, _level: window::WindowLevel) {}
+    pub fn is_decorated(&self) -> bool {
+        !self.get_flag(ORBITAL_FLAG_BORDERLESS).unwrap_or(false)
+    }
+
+    #[inline]
+    pub fn set_window_level(&self, level: window::WindowLevel) {
+        match level {
+            window::WindowLevel::AlwaysOnBottom => {
+                let _ = self.set_flag(ORBITAL_FLAG_BACK, true);
+            }
+            window::WindowLevel::Normal => {
+                let _ = self.set_flag(ORBITAL_FLAG_BACK, false);
+                let _ = self.set_flag(ORBITAL_FLAG_FRONT, false);
+            }
+            window::WindowLevel::AlwaysOnTop => {
+                let _ = self.set_flag(ORBITAL_FLAG_FRONT, true);
+            }
+        }
+    }
 
     #[inline]
     pub fn set_window_icon(&self, _window_icon: Option<crate::icon::Icon>) {}
@@ -359,30 +398,58 @@ impl Window {
     }
 
     #[inline]
-    pub fn set_cursor_grab(&self, _: window::CursorGrabMode) -> Result<(), error::ExternalError> {
-        Err(error::ExternalError::NotSupported(
-            error::NotSupportedError::new(),
-        ))
+    pub fn set_cursor_grab(
+        &self,
+        mode: window::CursorGrabMode,
+    ) -> Result<(), error::ExternalError> {
+        let (grab, relative) = match mode {
+            window::CursorGrabMode::None => (false, false),
+            window::CursorGrabMode::Confined => (true, false),
+            window::CursorGrabMode::Locked => (true, true),
+        };
+        self.window_socket
+            .write(format!("M,G,{}", if grab { 1 } else { 0 }).as_bytes())
+            .map_err(|err| error::ExternalError::Os(os_error!(OsError::new(err))))?;
+        self.window_socket
+            .write(format!("M,R,{}", if relative { 1 } else { 0 }).as_bytes())
+            .map_err(|err| error::ExternalError::Os(os_error!(OsError::new(err))))?;
+        Ok(())
     }
 
     #[inline]
-    pub fn set_cursor_visible(&self, _: bool) {}
+    pub fn set_cursor_visible(&self, visible: bool) {
+        let _ = self
+            .window_socket
+            .write(format!("M,C,{}", if visible { 1 } else { 0 }).as_bytes());
+    }
 
     #[inline]
     pub fn drag_window(&self) -> Result<(), error::ExternalError> {
-        Err(error::ExternalError::NotSupported(
-            error::NotSupportedError::new(),
-        ))
+        self.window_socket
+            .write(b"D")
+            .map_err(|err| error::ExternalError::Os(os_error!(OsError::new(err))))?;
+        Ok(())
     }
 
     #[inline]
     pub fn drag_resize_window(
         &self,
-        _direction: window::ResizeDirection,
+        direction: window::ResizeDirection,
     ) -> Result<(), error::ExternalError> {
-        Err(error::ExternalError::NotSupported(
-            error::NotSupportedError::new(),
-        ))
+        let arg = match direction {
+            window::ResizeDirection::East => "R",
+            window::ResizeDirection::North => "T",
+            window::ResizeDirection::NorthEast => "T,R",
+            window::ResizeDirection::NorthWest => "T,L",
+            window::ResizeDirection::South => "B",
+            window::ResizeDirection::SouthEast => "B,R",
+            window::ResizeDirection::SouthWest => "B,L",
+            window::ResizeDirection::West => "L",
+        };
+        self.window_socket
+            .write(format!("D,{}", arg).as_bytes())
+            .map_err(|err| error::ExternalError::Os(os_error!(OsError::new(err))))?;
+        Ok(())
     }
 
     #[inline]

src/window.rs

@@ -57,8 +57,11 @@ use serde::{Deserialize, Serialize};
 ///
 /// ## Platform-specific
 ///
-/// **Web:** The [`Window`], which is represented by a `HTMLElementCanvas`, can
-/// not be closed by dropping the [`Window`].
+/// - **Web:** The window is represented by a `HTMLElementCanvas`, and cannot
+///   currently be closed by dropping the [`Window`].
+/// - **Android:** Each window is spawned inside its own process, and as such
+///   Winit does not support multiple windows on Android. Create a new
+///   activity instead.
 pub struct Window {
     pub(crate) window: platform_impl::Window,
 }
@@ -946,7 +949,7 @@ impl Window {
     ///
     /// ## Platform-specific
     ///
-    /// - **Web / iOS / Android / Orbital:** Unsupported.
+    /// - **Web / iOS / Android:** Unsupported.
     /// - **X11:** Can only be set while building the window, with [`WindowBuilder::with_transparent`].
     #[inline]
     pub fn set_transparent(&self, transparent: bool) {
@@ -1079,7 +1082,7 @@ impl Window {
     ///
     /// ## Platform-specific
     ///
-    /// - **iOS / Android / Web / Orbital:** Unsupported.
+    /// - **iOS / Android / Web:** Unsupported.
     #[inline]
     pub fn set_maximized(&self, maximized: bool) {
         self.window
@@ -1090,7 +1093,7 @@ impl Window {
     ///
     /// ## Platform-specific
     ///
-    /// - **iOS / Android / Web / Orbital:** Unsupported.
+    /// - **iOS / Android / Web:** Unsupported.
     #[inline]
     pub fn is_maximized(&self) -> bool {
         self.window.maybe_wait_on_main(|w| w.is_maximized())
@@ -1450,7 +1453,7 @@ impl Window {
     /// - **Wayland:** The cursor is only hidden within the confines of the window.
     /// - **macOS:** The cursor is hidden as long as the window has input focus, even if the cursor is
     ///   outside of the window.
-    /// - **iOS / Android / Orbital:** Unsupported.
+    /// - **iOS / Android:** Unsupported.
     #[inline]
     pub fn set_cursor_visible(&self, visible: bool) {
         self.window
@@ -1467,7 +1470,7 @@ impl Window {
     /// - **X11:** Un-grabs the cursor.
     /// - **Wayland:** Requires the cursor to be inside the window to be dragged.
     /// - **macOS:** May prevent the button release event to be triggered.
-    /// - **iOS / Android / Web / Orbital:** Always returns an [`ExternalError::NotSupported`].
+    /// - **iOS / Android / Web:** Always returns an [`ExternalError::NotSupported`].
     #[inline]
     pub fn drag_window(&self) -> Result<(), ExternalError> {
         self.window.maybe_wait_on_main(|w| w.drag_window())
@@ -1481,7 +1484,7 @@ impl Window {
     /// ## Platform-specific
     ///
     /// - **macOS:** Always returns an [`ExternalError::NotSupported`]
-    /// - **iOS / Android / Web / Orbital:** Always returns an [`ExternalError::NotSupported`].
+    /// - **iOS / Android / Web:** Always returns an [`ExternalError::NotSupported`].
     #[inline]
     pub fn drag_resize_window(&self, direction: ResizeDirection) -> Result<(), ExternalError> {
         self.window
@@ -1642,7 +1645,7 @@ pub enum CursorGrabMode {
     /// ## Platform-specific
     ///
     /// - **macOS:** Not implemented. Always returns [`ExternalError::NotSupported`] for now.
-    /// - **iOS / Android / Web / Orbital:** Always returns an [`ExternalError::NotSupported`].
+    /// - **iOS / Android / Web:** Always returns an [`ExternalError::NotSupported`].
     Confined,
 
     /// The cursor is locked inside the window area to the certain position.
@@ -1653,7 +1656,7 @@ pub enum CursorGrabMode {
     /// ## Platform-specific
     ///
     /// - **X11 / Windows:** Not implemented. Always returns [`ExternalError::NotSupported`] for now.
-    /// - **iOS / Android / Orbital:** Always returns an [`ExternalError::NotSupported`].
+    /// - **iOS / Android:** Always returns an [`ExternalError::NotSupported`].
     Locked,
 }