On Windows, add support for Window::set_transparent

CHANGELOG.md

@@ -16,6 +16,7 @@ Unreleased` header.
 - On Wayland, ignore resize requests when the window is fully tiled.
 - On Wayland, use `configure_bounds` to constrain `with_inner_size` when compositor wants users to pick size.
 - On Windows, fix deadlock when accessing the state during `Cursor{Enter,Leave}`.
+- On Windows, add support for `Window::set_transparent`.
 - On macOS, fix deadlock when entering a nested event loop from an event handler.
 
 # 0.29.2

src/platform_impl/windows/window.rs

@@ -126,7 +126,16 @@ impl Window {
         }
     }
 
-    pub fn set_transparent(&self, _transparent: bool) {}
+    pub fn set_transparent(&self, transparent: 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().unwrap(), window.0, |f| {
+                f.set(WindowFlags::TRANSPARENT, transparent)
+            });
+        });
+    }
 
     pub fn set_blur(&self, _blur: bool) {}
 

src/window.rs

@@ -904,7 +904,7 @@ impl Window {
     ///
     /// ## Platform-specific
     ///
-    /// - **Windows / Web / iOS / Android / Orbital:** Unsupported.
+    /// - **Web / iOS / Android / Orbital:** Unsupported.
     /// - **X11:** Can only be set while building the window, with [`WindowBuilder::with_transparent`].
     #[inline]
     pub fn set_transparent(&self, transparent: bool) {