wayland: Add WindowExtWayland::xdg_toplevel

src/changelog/unreleased.md

@@ -70,6 +70,7 @@ changelog entry.
 - Added `Window::surface_position`, which is the position of the surface inside the window.
 - Added `Window::safe_area`, which describes the area of the surface that is unobstructed.
 - On X11, Wayland, Windows and macOS, improved scancode conversions for more obscure key codes.
+- On Wayland, add `WindowExtWayland::xdg_toplevel`.
 - Add ability to make non-activating window on macOS using `NSPanel` with `NSWindowStyleMask::NonactivatingPanel`.
 
 ### Changed

src/platform/wayland.rs

@@ -13,10 +13,14 @@
 //! * `wayland-csd-adwaita` (default).
 //! * `wayland-csd-adwaita-crossfont`.
 //! * `wayland-csd-adwaita-notitle`.
+
+use std::ffi::c_void;
+use std::ptr::NonNull;
+
 use crate::event_loop::{ActiveEventLoop, EventLoop, EventLoopBuilder};
 use crate::monitor::MonitorHandle;
 pub use crate::window::Theme;
-use crate::window::{Window as CoreWindow, WindowAttributes};
+use crate::window::WindowAttributes;
 
 /// Additional methods on [`ActiveEventLoop`] that are specific to Wayland.
 pub trait ActiveEventLoopExtWayland {
@@ -73,9 +77,10 @@ impl EventLoopBuilderExtWayland for EventLoopBuilder {
 /// Additional methods on [`Window`] that are specific to Wayland.
 ///
 /// [`Window`]: crate::window::Window
-pub trait WindowExtWayland {}
-
-impl WindowExtWayland for dyn CoreWindow + '_ {}
+pub trait WindowExtWayland {
+    /// Returns `xdg_toplevel` of the window or [`None`] if the window is X11 window.
+    fn xdg_toplevel(&self) -> Option<NonNull<c_void>>;
+}
 
 /// Additional methods on [`WindowAttributes`] that are specific to Wayland.
 pub trait WindowAttributesExtWayland {

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

@@ -1,5 +1,7 @@
 //! The Wayland window.
 
+use std::ffi::c_void;
+use std::ptr::NonNull;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, Mutex};
 
@@ -22,6 +24,7 @@ use crate::error::{NotSupportedError, RequestError};
 use crate::event::{Ime, WindowEvent};
 use crate::event_loop::AsyncRequestSerial;
 use crate::monitor::MonitorHandle as CoreMonitorHandle;
+use crate::platform::wayland::WindowExtWayland;
 use crate::platform_impl::{Fullscreen, MonitorHandle as PlatformMonitorHandle};
 use crate::window::{
     Cursor, CursorGrabMode, Fullscreen as CoreFullscreen, ImePurpose, ResizeDirection, Theme,
@@ -659,6 +662,16 @@ impl CoreWindow for Window {
     }
 }
 
+impl WindowExtWayland for dyn CoreWindow + '_ {
+    #[inline]
+    fn xdg_toplevel(&self) -> Option<NonNull<c_void>> {
+        let w = self.as_any().downcast_ref::<Window>()?;
+        let id = w.window.xdg_toplevel().id();
+
+        NonNull::new(id.as_ptr().cast())
+    }
+}
+
 /// The request from the window to the event loop.
 #[derive(Debug)]
 pub struct WindowRequests {