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windows: ignore spurious mouse move messages (#1435)

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Fixes https://github.com/rust-windowing/winit/issues/1428
This commit is contained in:
Philippe Renon 2020-03-06 22:15:49 +01:00 • committed by GitHub
parent b8326f6452
commit 71bd6e73ca
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3 changed files with 23 additions and 10 deletions
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28
src/platform_impl/windows/event_loop.rs
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@ -856,15 +856,25 @@ unsafe extern "system" fn public_window_callback<T: 'static>(
let x = windowsx::GET_X_LPARAM(lparam) as f64;
let y = windowsx::GET_Y_LPARAM(lparam) as f64;
let position = PhysicalPosition::new(x, y);
subclass_input.send_event(Event::WindowEvent {
window_id: RootWindowId(WindowId(window)),
event: CursorMoved {
device_id: DEVICE_ID,
position,
modifiers: event::get_key_mods(),
},
});
let cursor_moved;
{
// handle spurious WM_MOUSEMOVE messages
// see https://devblogs.microsoft.com/oldnewthing/20031001-00/?p=42343
// and http://debugandconquer.blogspot.com/2015/08/the-cause-of-spurious-mouse-move.html
let mut w = subclass_input.window_state.lock();
cursor_moved = w.mouse.last_position != Some(position);
w.mouse.last_position = Some(position);
}
if cursor_moved {
subclass_input.send_event(Event::WindowEvent {
window_id: RootWindowId(WindowId(window)),
event: CursorMoved {
device_id: DEVICE_ID,
position,
modifiers: event::get_key_mods(),
},
});
}
0
}