windows: Send ModifiersChanged(ModifiersState::empty) on KILLFOCUS

Very similar to the changes made in [1], as focus is lost, send an event to the window indicating that the modifiers have been released. It's unclear to me (without a Windows device to test this on) whether this is necessary, but it certainly ensures that unfocused windows will have at least received this event, which is an improvement. [1]: f79f216 Signed-off-by: Kristofer Rye <[email protected]>
chrisduerr · Jan 22, 2020 · 88aab18 · 88aab18
1 parent eb1c08d
commit 88aab18
Showing 1 changed file with 10 additions and 1 deletion.
diff --git a/src/platform_impl/windows/event_loop.rs b/src/platform_impl/windows/event_loop.rs
@@ -1357,7 +1357,11 @@ unsafe extern "system" fn public_window_callback<T: 'static>(
         }
 
         winuser::WM_KILLFOCUS => {
-            use crate::event::{ElementState::Released, WindowEvent::Focused};
+            use crate::event::{
+                ElementState::Released,
+                ModifiersState,
+                WindowEvent::{Focused, ModifiersChanged},
+            };
             for windows_keycode in event::get_pressed_keys() {
                 let scancode =
                     winuser::MapVirtualKeyA(windows_keycode as _, winuser::MAPVK_VK_TO_VSC);
@@ -1379,6 +1383,11 @@ unsafe extern "system" fn public_window_callback<T: 'static>(
                 })
             }
 
+            subclass_input.send_event(Event::WindowEvent {
+                window_id: RootWindowId(WindowId(window)),
+                event: ModifiersChanged(ModifiersState::empty()),
+            });
+
             subclass_input.send_event(Event::WindowEvent {
                 window_id: RootWindowId(WindowId(window)),
                 event: Focused(false),