1use std::rc::Rc;
2
3use ::util::ResultExt;
4use anyhow::Context as _;
5use windows::{
6 Win32::{
7 Foundation::*,
8 Graphics::Gdi::*,
9 System::SystemServices::*,
10 UI::{
11 Controls::*,
12 HiDpi::*,
13 Input::{Ime::*, KeyboardAndMouse::*},
14 WindowsAndMessaging::*,
15 },
16 },
17 core::PCWSTR,
18};
19
20use crate::*;
21
22pub(crate) const WM_GPUI_CURSOR_STYLE_CHANGED: u32 = WM_USER + 1;
23pub(crate) const WM_GPUI_CLOSE_ONE_WINDOW: u32 = WM_USER + 2;
24pub(crate) const WM_GPUI_TASK_DISPATCHED_ON_MAIN_THREAD: u32 = WM_USER + 3;
25pub(crate) const WM_GPUI_DOCK_MENU_ACTION: u32 = WM_USER + 4;
26
27const SIZE_MOVE_LOOP_TIMER_ID: usize = 1;
28const AUTO_HIDE_TASKBAR_THICKNESS_PX: i32 = 1;
29
30pub(crate) fn handle_msg(
31 handle: HWND,
32 msg: u32,
33 wparam: WPARAM,
34 lparam: LPARAM,
35 state_ptr: Rc<WindowsWindowStatePtr>,
36) -> LRESULT {
37 let handled = match msg {
38 WM_ACTIVATE => handle_activate_msg(wparam, state_ptr),
39 WM_CREATE => handle_create_msg(handle, state_ptr),
40 WM_MOVE => handle_move_msg(handle, lparam, state_ptr),
41 WM_SIZE => handle_size_msg(wparam, lparam, state_ptr),
42 WM_GETMINMAXINFO => handle_get_min_max_info_msg(lparam, state_ptr),
43 WM_ENTERSIZEMOVE | WM_ENTERMENULOOP => handle_size_move_loop(handle),
44 WM_EXITSIZEMOVE | WM_EXITMENULOOP => handle_size_move_loop_exit(handle),
45 WM_TIMER => handle_timer_msg(handle, wparam, state_ptr),
46 WM_NCCALCSIZE => handle_calc_client_size(handle, wparam, lparam, state_ptr),
47 WM_DPICHANGED => handle_dpi_changed_msg(handle, wparam, lparam, state_ptr),
48 WM_DISPLAYCHANGE => handle_display_change_msg(handle, state_ptr),
49 WM_NCHITTEST => handle_hit_test_msg(handle, msg, wparam, lparam, state_ptr),
50 WM_PAINT => handle_paint_msg(handle, state_ptr),
51 WM_CLOSE => handle_close_msg(handle, state_ptr),
52 WM_DESTROY => handle_destroy_msg(handle, state_ptr),
53 WM_MOUSEMOVE => handle_mouse_move_msg(handle, lparam, wparam, state_ptr),
54 WM_MOUSELEAVE | WM_NCMOUSELEAVE => handle_mouse_leave_msg(state_ptr),
55 WM_NCMOUSEMOVE => handle_nc_mouse_move_msg(handle, lparam, state_ptr),
56 WM_NCLBUTTONDOWN => {
57 handle_nc_mouse_down_msg(handle, MouseButton::Left, wparam, lparam, state_ptr)
58 }
59 WM_NCRBUTTONDOWN => {
60 handle_nc_mouse_down_msg(handle, MouseButton::Right, wparam, lparam, state_ptr)
61 }
62 WM_NCMBUTTONDOWN => {
63 handle_nc_mouse_down_msg(handle, MouseButton::Middle, wparam, lparam, state_ptr)
64 }
65 WM_NCLBUTTONUP => {
66 handle_nc_mouse_up_msg(handle, MouseButton::Left, wparam, lparam, state_ptr)
67 }
68 WM_NCRBUTTONUP => {
69 handle_nc_mouse_up_msg(handle, MouseButton::Right, wparam, lparam, state_ptr)
70 }
71 WM_NCMBUTTONUP => {
72 handle_nc_mouse_up_msg(handle, MouseButton::Middle, wparam, lparam, state_ptr)
73 }
74 WM_LBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Left, lparam, state_ptr),
75 WM_RBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Right, lparam, state_ptr),
76 WM_MBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Middle, lparam, state_ptr),
77 WM_XBUTTONDOWN => {
78 handle_xbutton_msg(handle, wparam, lparam, handle_mouse_down_msg, state_ptr)
79 }
80 WM_LBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Left, lparam, state_ptr),
81 WM_RBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Right, lparam, state_ptr),
82 WM_MBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Middle, lparam, state_ptr),
83 WM_XBUTTONUP => handle_xbutton_msg(handle, wparam, lparam, handle_mouse_up_msg, state_ptr),
84 WM_MOUSEWHEEL => handle_mouse_wheel_msg(handle, wparam, lparam, state_ptr),
85 WM_MOUSEHWHEEL => handle_mouse_horizontal_wheel_msg(handle, wparam, lparam, state_ptr),
86 WM_SYSKEYDOWN => handle_syskeydown_msg(handle, wparam, lparam, state_ptr),
87 WM_SYSKEYUP => handle_syskeyup_msg(handle, wparam, lparam, state_ptr),
88 WM_SYSCOMMAND => handle_system_command(wparam, state_ptr),
89 WM_KEYDOWN => handle_keydown_msg(handle, wparam, lparam, state_ptr),
90 WM_KEYUP => handle_keyup_msg(handle, wparam, lparam, state_ptr),
91 WM_CHAR => handle_char_msg(wparam, state_ptr),
92 WM_DEADCHAR => handle_dead_char_msg(wparam, state_ptr),
93 WM_IME_STARTCOMPOSITION => handle_ime_position(handle, state_ptr),
94 WM_IME_COMPOSITION => handle_ime_composition(handle, lparam, state_ptr),
95 WM_SETCURSOR => handle_set_cursor(handle, lparam, state_ptr),
96 WM_SETTINGCHANGE => handle_system_settings_changed(handle, wparam, lparam, state_ptr),
97 WM_INPUTLANGCHANGE => handle_input_language_changed(lparam, state_ptr),
98 WM_GPUI_CURSOR_STYLE_CHANGED => handle_cursor_changed(lparam, state_ptr),
99 _ => None,
100 };
101 if let Some(n) = handled {
102 LRESULT(n)
103 } else {
104 unsafe { DefWindowProcW(handle, msg, wparam, lparam) }
105 }
106}
107
108fn handle_move_msg(
109 handle: HWND,
110 lparam: LPARAM,
111 state_ptr: Rc<WindowsWindowStatePtr>,
112) -> Option<isize> {
113 let mut lock = state_ptr.state.borrow_mut();
114 let origin = logical_point(
115 lparam.signed_loword() as f32,
116 lparam.signed_hiword() as f32,
117 lock.scale_factor,
118 );
119 lock.origin = origin;
120 let size = lock.logical_size;
121 let center_x = origin.x.0 + size.width.0 / 2.;
122 let center_y = origin.y.0 + size.height.0 / 2.;
123 let monitor_bounds = lock.display.bounds();
124 if center_x < monitor_bounds.left().0
125 || center_x > monitor_bounds.right().0
126 || center_y < monitor_bounds.top().0
127 || center_y > monitor_bounds.bottom().0
128 {
129 // center of the window may have moved to another monitor
130 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
131 // minimize the window can trigger this event too, in this case,
132 // monitor is invalid, we do nothing.
133 if !monitor.is_invalid() && lock.display.handle != monitor {
134 // we will get the same monitor if we only have one
135 lock.display = WindowsDisplay::new_with_handle(monitor);
136 }
137 }
138 if let Some(mut callback) = lock.callbacks.moved.take() {
139 drop(lock);
140 callback();
141 state_ptr.state.borrow_mut().callbacks.moved = Some(callback);
142 }
143 Some(0)
144}
145
146fn handle_get_min_max_info_msg(
147 lparam: LPARAM,
148 state_ptr: Rc<WindowsWindowStatePtr>,
149) -> Option<isize> {
150 let lock = state_ptr.state.borrow();
151 let min_size = lock.min_size?;
152 let scale_factor = lock.scale_factor;
153 let boarder_offset = lock.border_offset;
154 drop(lock);
155 unsafe {
156 let minmax_info = &mut *(lparam.0 as *mut MINMAXINFO);
157 minmax_info.ptMinTrackSize.x =
158 min_size.width.scale(scale_factor).0 as i32 + boarder_offset.width_offset;
159 minmax_info.ptMinTrackSize.y =
160 min_size.height.scale(scale_factor).0 as i32 + boarder_offset.height_offset;
161 }
162 Some(0)
163}
164
165fn handle_size_msg(
166 wparam: WPARAM,
167 lparam: LPARAM,
168 state_ptr: Rc<WindowsWindowStatePtr>,
169) -> Option<isize> {
170 let mut lock = state_ptr.state.borrow_mut();
171
172 // Don't resize the renderer when the window is minimized, but record that it was minimized so
173 // that on restore the swap chain can be recreated via `update_drawable_size_even_if_unchanged`.
174 if wparam.0 == SIZE_MINIMIZED as usize {
175 lock.restore_from_minimized = lock.callbacks.request_frame.take();
176 return Some(0);
177 }
178
179 let width = lparam.loword().max(1) as i32;
180 let height = lparam.hiword().max(1) as i32;
181 let new_size = size(DevicePixels(width), DevicePixels(height));
182 let scale_factor = lock.scale_factor;
183 if lock.restore_from_minimized.is_some() {
184 lock.renderer
185 .update_drawable_size_even_if_unchanged(new_size);
186 lock.callbacks.request_frame = lock.restore_from_minimized.take();
187 } else {
188 lock.renderer.update_drawable_size(new_size);
189 }
190 let new_size = new_size.to_pixels(scale_factor);
191 lock.logical_size = new_size;
192 if let Some(mut callback) = lock.callbacks.resize.take() {
193 drop(lock);
194 callback(new_size, scale_factor);
195 state_ptr.state.borrow_mut().callbacks.resize = Some(callback);
196 }
197 Some(0)
198}
199
200fn handle_size_move_loop(handle: HWND) -> Option<isize> {
201 unsafe {
202 let ret = SetTimer(
203 Some(handle),
204 SIZE_MOVE_LOOP_TIMER_ID,
205 USER_TIMER_MINIMUM,
206 None,
207 );
208 if ret == 0 {
209 log::error!(
210 "unable to create timer: {}",
211 std::io::Error::last_os_error()
212 );
213 }
214 }
215 None
216}
217
218fn handle_size_move_loop_exit(handle: HWND) -> Option<isize> {
219 unsafe {
220 KillTimer(Some(handle), SIZE_MOVE_LOOP_TIMER_ID).log_err();
221 }
222 None
223}
224
225fn handle_timer_msg(
226 handle: HWND,
227 wparam: WPARAM,
228 state_ptr: Rc<WindowsWindowStatePtr>,
229) -> Option<isize> {
230 if wparam.0 == SIZE_MOVE_LOOP_TIMER_ID {
231 for runnable in state_ptr.main_receiver.drain() {
232 runnable.run();
233 }
234 handle_paint_msg(handle, state_ptr)
235 } else {
236 None
237 }
238}
239
240fn handle_paint_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
241 let mut lock = state_ptr.state.borrow_mut();
242 if let Some(mut request_frame) = lock.callbacks.request_frame.take() {
243 drop(lock);
244 request_frame(Default::default());
245 state_ptr.state.borrow_mut().callbacks.request_frame = Some(request_frame);
246 }
247 unsafe { ValidateRect(Some(handle), None).ok().log_err() };
248 Some(0)
249}
250
251fn handle_close_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
252 let mut lock = state_ptr.state.borrow_mut();
253 let output = if let Some(mut callback) = lock.callbacks.should_close.take() {
254 drop(lock);
255 let should_close = callback();
256 state_ptr.state.borrow_mut().callbacks.should_close = Some(callback);
257 if should_close { None } else { Some(0) }
258 } else {
259 None
260 };
261
262 // Workaround as window close animation is not played with `WS_EX_LAYERED` enabled.
263 if output.is_none() {
264 unsafe {
265 let current_style = get_window_long(handle, GWL_EXSTYLE);
266 set_window_long(
267 handle,
268 GWL_EXSTYLE,
269 current_style & !WS_EX_LAYERED.0 as isize,
270 );
271 }
272 }
273
274 output
275}
276
277fn handle_destroy_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
278 let callback = {
279 let mut lock = state_ptr.state.borrow_mut();
280 lock.callbacks.close.take()
281 };
282 if let Some(callback) = callback {
283 callback();
284 }
285 unsafe {
286 PostThreadMessageW(
287 state_ptr.main_thread_id_win32,
288 WM_GPUI_CLOSE_ONE_WINDOW,
289 WPARAM(state_ptr.validation_number),
290 LPARAM(handle.0 as isize),
291 )
292 .log_err();
293 }
294 Some(0)
295}
296
297fn handle_mouse_move_msg(
298 handle: HWND,
299 lparam: LPARAM,
300 wparam: WPARAM,
301 state_ptr: Rc<WindowsWindowStatePtr>,
302) -> Option<isize> {
303 start_tracking_mouse(handle, &state_ptr, TME_LEAVE);
304
305 let mut lock = state_ptr.state.borrow_mut();
306 let Some(mut func) = lock.callbacks.input.take() else {
307 return Some(1);
308 };
309 let scale_factor = lock.scale_factor;
310 drop(lock);
311
312 let pressed_button = match MODIFIERKEYS_FLAGS(wparam.loword() as u32) {
313 flags if flags.contains(MK_LBUTTON) => Some(MouseButton::Left),
314 flags if flags.contains(MK_RBUTTON) => Some(MouseButton::Right),
315 flags if flags.contains(MK_MBUTTON) => Some(MouseButton::Middle),
316 flags if flags.contains(MK_XBUTTON1) => {
317 Some(MouseButton::Navigate(NavigationDirection::Back))
318 }
319 flags if flags.contains(MK_XBUTTON2) => {
320 Some(MouseButton::Navigate(NavigationDirection::Forward))
321 }
322 _ => None,
323 };
324 let x = lparam.signed_loword() as f32;
325 let y = lparam.signed_hiword() as f32;
326 let input = PlatformInput::MouseMove(MouseMoveEvent {
327 position: logical_point(x, y, scale_factor),
328 pressed_button,
329 modifiers: current_modifiers(),
330 });
331 let handled = !func(input).propagate;
332 state_ptr.state.borrow_mut().callbacks.input = Some(func);
333
334 if handled { Some(0) } else { Some(1) }
335}
336
337fn handle_mouse_leave_msg(state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
338 let mut lock = state_ptr.state.borrow_mut();
339 lock.hovered = false;
340 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
341 drop(lock);
342 callback(false);
343 state_ptr.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
344 }
345
346 Some(0)
347}
348
349fn handle_syskeydown_msg(
350 handle: HWND,
351 wparam: WPARAM,
352 lparam: LPARAM,
353 state_ptr: Rc<WindowsWindowStatePtr>,
354) -> Option<isize> {
355 let mut lock = state_ptr.state.borrow_mut();
356 let input = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
357 PlatformInput::KeyDown(KeyDownEvent {
358 keystroke,
359 is_held: lparam.0 & (0x1 << 30) > 0,
360 })
361 })?;
362 let mut func = lock.callbacks.input.take()?;
363 drop(lock);
364
365 let handled = !func(input).propagate;
366
367 let mut lock = state_ptr.state.borrow_mut();
368 lock.callbacks.input = Some(func);
369
370 if handled {
371 lock.system_key_handled = true;
372 Some(0)
373 } else {
374 // we need to call `DefWindowProcW`, or we will lose the system-wide `Alt+F4`, `Alt+{other keys}`
375 // shortcuts.
376 None
377 }
378}
379
380fn handle_syskeyup_msg(
381 handle: HWND,
382 wparam: WPARAM,
383 lparam: LPARAM,
384 state_ptr: Rc<WindowsWindowStatePtr>,
385) -> Option<isize> {
386 let mut lock = state_ptr.state.borrow_mut();
387 let input = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
388 PlatformInput::KeyUp(KeyUpEvent { keystroke })
389 })?;
390 let mut func = lock.callbacks.input.take()?;
391 drop(lock);
392 func(input);
393 state_ptr.state.borrow_mut().callbacks.input = Some(func);
394
395 // Always return 0 to indicate that the message was handled, so we could properly handle `ModifiersChanged` event.
396 Some(0)
397}
398
399// It's a known bug that you can't trigger `ctrl-shift-0`. See:
400// https://superuser.com/questions/1455762/ctrl-shift-number-key-combination-has-stopped-working-for-a-few-numbers
401fn handle_keydown_msg(
402 handle: HWND,
403 wparam: WPARAM,
404 lparam: LPARAM,
405 state_ptr: Rc<WindowsWindowStatePtr>,
406) -> Option<isize> {
407 let mut lock = state_ptr.state.borrow_mut();
408 let Some(input) = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
409 PlatformInput::KeyDown(KeyDownEvent {
410 keystroke,
411 is_held: lparam.0 & (0x1 << 30) > 0,
412 })
413 }) else {
414 return Some(1);
415 };
416 drop(lock);
417
418 let is_composing = with_input_handler(&state_ptr, |input_handler| {
419 input_handler.marked_text_range()
420 })
421 .flatten()
422 .is_some();
423 if is_composing {
424 translate_message(handle, wparam, lparam);
425 return Some(0);
426 }
427
428 let Some(mut func) = state_ptr.state.borrow_mut().callbacks.input.take() else {
429 return Some(1);
430 };
431
432 let handled = !func(input).propagate;
433
434 state_ptr.state.borrow_mut().callbacks.input = Some(func);
435
436 if handled {
437 Some(0)
438 } else {
439 translate_message(handle, wparam, lparam);
440 Some(1)
441 }
442}
443
444fn handle_keyup_msg(
445 handle: HWND,
446 wparam: WPARAM,
447 lparam: LPARAM,
448 state_ptr: Rc<WindowsWindowStatePtr>,
449) -> Option<isize> {
450 let mut lock = state_ptr.state.borrow_mut();
451 let Some(input) = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
452 PlatformInput::KeyUp(KeyUpEvent { keystroke })
453 }) else {
454 return Some(1);
455 };
456
457 let Some(mut func) = lock.callbacks.input.take() else {
458 return Some(1);
459 };
460 drop(lock);
461
462 let handled = !func(input).propagate;
463 state_ptr.state.borrow_mut().callbacks.input = Some(func);
464
465 if handled { Some(0) } else { Some(1) }
466}
467
468fn handle_char_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
469 let input = parse_char_message(wparam, &state_ptr)?;
470 with_input_handler(&state_ptr, |input_handler| {
471 input_handler.replace_text_in_range(None, &input);
472 });
473
474 Some(0)
475}
476
477fn handle_dead_char_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
478 let ch = char::from_u32(wparam.0 as u32)?.to_string();
479 with_input_handler(&state_ptr, |input_handler| {
480 input_handler.replace_and_mark_text_in_range(None, &ch, None);
481 });
482 None
483}
484
485fn handle_mouse_down_msg(
486 handle: HWND,
487 button: MouseButton,
488 lparam: LPARAM,
489 state_ptr: Rc<WindowsWindowStatePtr>,
490) -> Option<isize> {
491 unsafe { SetCapture(handle) };
492 let mut lock = state_ptr.state.borrow_mut();
493 let Some(mut func) = lock.callbacks.input.take() else {
494 return Some(1);
495 };
496 let x = lparam.signed_loword();
497 let y = lparam.signed_hiword();
498 let physical_point = point(DevicePixels(x as i32), DevicePixels(y as i32));
499 let click_count = lock.click_state.update(button, physical_point);
500 let scale_factor = lock.scale_factor;
501 drop(lock);
502
503 let input = PlatformInput::MouseDown(MouseDownEvent {
504 button,
505 position: logical_point(x as f32, y as f32, scale_factor),
506 modifiers: current_modifiers(),
507 click_count,
508 first_mouse: false,
509 });
510 let handled = !func(input).propagate;
511 state_ptr.state.borrow_mut().callbacks.input = Some(func);
512
513 if handled { Some(0) } else { Some(1) }
514}
515
516fn handle_mouse_up_msg(
517 _handle: HWND,
518 button: MouseButton,
519 lparam: LPARAM,
520 state_ptr: Rc<WindowsWindowStatePtr>,
521) -> Option<isize> {
522 unsafe { ReleaseCapture().log_err() };
523 let mut lock = state_ptr.state.borrow_mut();
524 let Some(mut func) = lock.callbacks.input.take() else {
525 return Some(1);
526 };
527 let x = lparam.signed_loword() as f32;
528 let y = lparam.signed_hiword() as f32;
529 let click_count = lock.click_state.current_count;
530 let scale_factor = lock.scale_factor;
531 drop(lock);
532
533 let input = PlatformInput::MouseUp(MouseUpEvent {
534 button,
535 position: logical_point(x, y, scale_factor),
536 modifiers: current_modifiers(),
537 click_count,
538 });
539 let handled = !func(input).propagate;
540 state_ptr.state.borrow_mut().callbacks.input = Some(func);
541
542 if handled { Some(0) } else { Some(1) }
543}
544
545fn handle_xbutton_msg(
546 handle: HWND,
547 wparam: WPARAM,
548 lparam: LPARAM,
549 handler: impl Fn(HWND, MouseButton, LPARAM, Rc<WindowsWindowStatePtr>) -> Option<isize>,
550 state_ptr: Rc<WindowsWindowStatePtr>,
551) -> Option<isize> {
552 let nav_dir = match wparam.hiword() {
553 XBUTTON1 => NavigationDirection::Back,
554 XBUTTON2 => NavigationDirection::Forward,
555 _ => return Some(1),
556 };
557 handler(handle, MouseButton::Navigate(nav_dir), lparam, state_ptr)
558}
559
560fn handle_mouse_wheel_msg(
561 handle: HWND,
562 wparam: WPARAM,
563 lparam: LPARAM,
564 state_ptr: Rc<WindowsWindowStatePtr>,
565) -> Option<isize> {
566 let modifiers = current_modifiers();
567 let mut lock = state_ptr.state.borrow_mut();
568 let Some(mut func) = lock.callbacks.input.take() else {
569 return Some(1);
570 };
571 let scale_factor = lock.scale_factor;
572 let wheel_scroll_amount = match modifiers.shift {
573 true => lock.system_settings.mouse_wheel_settings.wheel_scroll_chars,
574 false => lock.system_settings.mouse_wheel_settings.wheel_scroll_lines,
575 };
576 drop(lock);
577
578 let wheel_distance =
579 (wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_amount as f32;
580 let mut cursor_point = POINT {
581 x: lparam.signed_loword().into(),
582 y: lparam.signed_hiword().into(),
583 };
584 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
585 let input = PlatformInput::ScrollWheel(ScrollWheelEvent {
586 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
587 delta: ScrollDelta::Lines(match modifiers.shift {
588 true => Point {
589 x: wheel_distance,
590 y: 0.0,
591 },
592 false => Point {
593 y: wheel_distance,
594 x: 0.0,
595 },
596 }),
597 modifiers,
598 touch_phase: TouchPhase::Moved,
599 });
600 let handled = !func(input).propagate;
601 state_ptr.state.borrow_mut().callbacks.input = Some(func);
602
603 if handled { Some(0) } else { Some(1) }
604}
605
606fn handle_mouse_horizontal_wheel_msg(
607 handle: HWND,
608 wparam: WPARAM,
609 lparam: LPARAM,
610 state_ptr: Rc<WindowsWindowStatePtr>,
611) -> Option<isize> {
612 let mut lock = state_ptr.state.borrow_mut();
613 let Some(mut func) = lock.callbacks.input.take() else {
614 return Some(1);
615 };
616 let scale_factor = lock.scale_factor;
617 let wheel_scroll_chars = lock.system_settings.mouse_wheel_settings.wheel_scroll_chars;
618 drop(lock);
619
620 let wheel_distance =
621 (-wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_chars as f32;
622 let mut cursor_point = POINT {
623 x: lparam.signed_loword().into(),
624 y: lparam.signed_hiword().into(),
625 };
626 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
627 let event = PlatformInput::ScrollWheel(ScrollWheelEvent {
628 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
629 delta: ScrollDelta::Lines(Point {
630 x: wheel_distance,
631 y: 0.0,
632 }),
633 modifiers: current_modifiers(),
634 touch_phase: TouchPhase::Moved,
635 });
636 let handled = !func(event).propagate;
637 state_ptr.state.borrow_mut().callbacks.input = Some(func);
638
639 if handled { Some(0) } else { Some(1) }
640}
641
642fn retrieve_caret_position(state_ptr: &Rc<WindowsWindowStatePtr>) -> Option<POINT> {
643 with_input_handler_and_scale_factor(state_ptr, |input_handler, scale_factor| {
644 let caret_range = input_handler.selected_text_range(false)?;
645 let caret_position = input_handler.bounds_for_range(caret_range.range)?;
646 Some(POINT {
647 // logical to physical
648 x: (caret_position.origin.x.0 * scale_factor) as i32,
649 y: (caret_position.origin.y.0 * scale_factor) as i32
650 + ((caret_position.size.height.0 * scale_factor) as i32 / 2),
651 })
652 })
653}
654
655fn handle_ime_position(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
656 unsafe {
657 let ctx = ImmGetContext(handle);
658
659 let Some(caret_position) = retrieve_caret_position(&state_ptr) else {
660 return Some(0);
661 };
662 {
663 let config = COMPOSITIONFORM {
664 dwStyle: CFS_POINT,
665 ptCurrentPos: caret_position,
666 ..Default::default()
667 };
668 ImmSetCompositionWindow(ctx, &config as _).ok().log_err();
669 }
670 {
671 let config = CANDIDATEFORM {
672 dwStyle: CFS_CANDIDATEPOS,
673 ptCurrentPos: caret_position,
674 ..Default::default()
675 };
676 ImmSetCandidateWindow(ctx, &config as _).ok().log_err();
677 }
678 ImmReleaseContext(handle, ctx).ok().log_err();
679 Some(0)
680 }
681}
682
683fn handle_ime_composition(
684 handle: HWND,
685 lparam: LPARAM,
686 state_ptr: Rc<WindowsWindowStatePtr>,
687) -> Option<isize> {
688 let ctx = unsafe { ImmGetContext(handle) };
689 let result = handle_ime_composition_inner(ctx, lparam, state_ptr);
690 unsafe { ImmReleaseContext(handle, ctx).ok().log_err() };
691 result
692}
693
694fn handle_ime_composition_inner(
695 ctx: HIMC,
696 lparam: LPARAM,
697 state_ptr: Rc<WindowsWindowStatePtr>,
698) -> Option<isize> {
699 let lparam = lparam.0 as u32;
700 if lparam == 0 {
701 // Japanese IME may send this message with lparam = 0, which indicates that
702 // there is no composition string.
703 with_input_handler(&state_ptr, |input_handler| {
704 input_handler.replace_text_in_range(None, "");
705 })?;
706 Some(0)
707 } else {
708 if lparam & GCS_COMPSTR.0 > 0 {
709 let comp_string = parse_ime_composition_string(ctx, GCS_COMPSTR)?;
710 let caret_pos = (!comp_string.is_empty() && lparam & GCS_CURSORPOS.0 > 0).then(|| {
711 let pos = retrieve_composition_cursor_position(ctx);
712 pos..pos
713 });
714 with_input_handler(&state_ptr, |input_handler| {
715 input_handler.replace_and_mark_text_in_range(None, &comp_string, caret_pos);
716 })?;
717 }
718 if lparam & GCS_RESULTSTR.0 > 0 {
719 let comp_result = parse_ime_composition_string(ctx, GCS_RESULTSTR)?;
720 with_input_handler(&state_ptr, |input_handler| {
721 input_handler.replace_text_in_range(None, &comp_result);
722 })?;
723 return Some(0);
724 }
725
726 // currently, we don't care other stuff
727 None
728 }
729}
730
731/// SEE: https://learn.microsoft.com/en-us/windows/win32/winmsg/wm-nccalcsize
732fn handle_calc_client_size(
733 handle: HWND,
734 wparam: WPARAM,
735 lparam: LPARAM,
736 state_ptr: Rc<WindowsWindowStatePtr>,
737) -> Option<isize> {
738 if !state_ptr.hide_title_bar || state_ptr.state.borrow().is_fullscreen() || wparam.0 == 0 {
739 return None;
740 }
741
742 let is_maximized = state_ptr.state.borrow().is_maximized();
743 let insets = get_client_area_insets(handle, is_maximized, state_ptr.windows_version);
744 // wparam is TRUE so lparam points to an NCCALCSIZE_PARAMS structure
745 let mut params = lparam.0 as *mut NCCALCSIZE_PARAMS;
746 let mut requested_client_rect = unsafe { &mut ((*params).rgrc) };
747
748 requested_client_rect[0].left += insets.left;
749 requested_client_rect[0].top += insets.top;
750 requested_client_rect[0].right -= insets.right;
751 requested_client_rect[0].bottom -= insets.bottom;
752
753 // Fix auto hide taskbar not showing. This solution is based on the approach
754 // used by Chrome. However, it may result in one row of pixels being obscured
755 // in our client area. But as Chrome says, "there seems to be no better solution."
756 if is_maximized {
757 if let Some(ref taskbar_position) = state_ptr
758 .state
759 .borrow()
760 .system_settings
761 .auto_hide_taskbar_position
762 {
763 // Fot the auto-hide taskbar, adjust in by 1 pixel on taskbar edge,
764 // so the window isn't treated as a "fullscreen app", which would cause
765 // the taskbar to disappear.
766 match taskbar_position {
767 AutoHideTaskbarPosition::Left => {
768 requested_client_rect[0].left += AUTO_HIDE_TASKBAR_THICKNESS_PX
769 }
770 AutoHideTaskbarPosition::Top => {
771 requested_client_rect[0].top += AUTO_HIDE_TASKBAR_THICKNESS_PX
772 }
773 AutoHideTaskbarPosition::Right => {
774 requested_client_rect[0].right -= AUTO_HIDE_TASKBAR_THICKNESS_PX
775 }
776 AutoHideTaskbarPosition::Bottom => {
777 requested_client_rect[0].bottom -= AUTO_HIDE_TASKBAR_THICKNESS_PX
778 }
779 }
780 }
781 }
782
783 Some(0)
784}
785
786fn handle_activate_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
787 let activated = wparam.loword() > 0;
788 let this = state_ptr.clone();
789 state_ptr
790 .executor
791 .spawn(async move {
792 let mut lock = this.state.borrow_mut();
793 if let Some(mut func) = lock.callbacks.active_status_change.take() {
794 drop(lock);
795 func(activated);
796 this.state.borrow_mut().callbacks.active_status_change = Some(func);
797 }
798 })
799 .detach();
800
801 None
802}
803
804fn handle_create_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
805 if state_ptr.hide_title_bar {
806 notify_frame_changed(handle);
807 Some(0)
808 } else {
809 None
810 }
811}
812
813fn handle_dpi_changed_msg(
814 handle: HWND,
815 wparam: WPARAM,
816 lparam: LPARAM,
817 state_ptr: Rc<WindowsWindowStatePtr>,
818) -> Option<isize> {
819 let new_dpi = wparam.loword() as f32;
820 let mut lock = state_ptr.state.borrow_mut();
821 lock.scale_factor = new_dpi / USER_DEFAULT_SCREEN_DPI as f32;
822 lock.border_offset.update(handle).log_err();
823 drop(lock);
824
825 let rect = unsafe { &*(lparam.0 as *const RECT) };
826 let width = rect.right - rect.left;
827 let height = rect.bottom - rect.top;
828 // this will emit `WM_SIZE` and `WM_MOVE` right here
829 // even before this function returns
830 // the new size is handled in `WM_SIZE`
831 unsafe {
832 SetWindowPos(
833 handle,
834 None,
835 rect.left,
836 rect.top,
837 width,
838 height,
839 SWP_NOZORDER | SWP_NOACTIVATE,
840 )
841 .context("unable to set window position after dpi has changed")
842 .log_err();
843 }
844
845 Some(0)
846}
847
848/// The following conditions will trigger this event:
849/// 1. The monitor on which the window is located goes offline or changes resolution.
850/// 2. Another monitor goes offline, is plugged in, or changes resolution.
851///
852/// In either case, the window will only receive information from the monitor on which
853/// it is located.
854///
855/// For example, in the case of condition 2, where the monitor on which the window is
856/// located has actually changed nothing, it will still receive this event.
857fn handle_display_change_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
858 // NOTE:
859 // Even the `lParam` holds the resolution of the screen, we just ignore it.
860 // Because WM_DPICHANGED, WM_MOVE, WM_SIZE will come first, window reposition and resize
861 // are handled there.
862 // So we only care about if monitor is disconnected.
863 let previous_monitor = state_ptr.state.borrow().display;
864 if WindowsDisplay::is_connected(previous_monitor.handle) {
865 // we are fine, other display changed
866 return None;
867 }
868 // display disconnected
869 // in this case, the OS will move our window to another monitor, and minimize it.
870 // we deminimize the window and query the monitor after moving
871 unsafe {
872 let _ = ShowWindow(handle, SW_SHOWNORMAL);
873 };
874 let new_monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
875 // all monitors disconnected
876 if new_monitor.is_invalid() {
877 log::error!("No monitor detected!");
878 return None;
879 }
880 let new_display = WindowsDisplay::new_with_handle(new_monitor);
881 state_ptr.state.borrow_mut().display = new_display;
882 Some(0)
883}
884
885fn handle_hit_test_msg(
886 handle: HWND,
887 msg: u32,
888 wparam: WPARAM,
889 lparam: LPARAM,
890 state_ptr: Rc<WindowsWindowStatePtr>,
891) -> Option<isize> {
892 if !state_ptr.is_movable || state_ptr.state.borrow().is_fullscreen() {
893 return None;
894 }
895
896 let mut lock = state_ptr.state.borrow_mut();
897 if let Some(mut callback) = lock.callbacks.hit_test_window_control.take() {
898 drop(lock);
899 let area = callback();
900 state_ptr
901 .state
902 .borrow_mut()
903 .callbacks
904 .hit_test_window_control = Some(callback);
905 if let Some(area) = area {
906 return match area {
907 WindowControlArea::Drag => Some(HTCAPTION as _),
908 WindowControlArea::Close => Some(HTCLOSE as _),
909 WindowControlArea::Max => Some(HTMAXBUTTON as _),
910 WindowControlArea::Min => Some(HTMINBUTTON as _),
911 };
912 }
913 } else {
914 drop(lock);
915 }
916
917 if !state_ptr.hide_title_bar {
918 // If the OS draws the title bar, we don't need to handle hit test messages.
919 return None;
920 }
921
922 // default handler for resize areas
923 let hit = unsafe { DefWindowProcW(handle, msg, wparam, lparam) };
924 if matches!(
925 hit.0 as u32,
926 HTNOWHERE
927 | HTRIGHT
928 | HTLEFT
929 | HTTOPLEFT
930 | HTTOP
931 | HTTOPRIGHT
932 | HTBOTTOMRIGHT
933 | HTBOTTOM
934 | HTBOTTOMLEFT
935 ) {
936 return Some(hit.0);
937 }
938
939 if state_ptr.state.borrow().is_fullscreen() {
940 return Some(HTCLIENT as _);
941 }
942
943 let dpi = unsafe { GetDpiForWindow(handle) };
944 let frame_y = unsafe { GetSystemMetricsForDpi(SM_CYFRAME, dpi) };
945
946 let mut cursor_point = POINT {
947 x: lparam.signed_loword().into(),
948 y: lparam.signed_hiword().into(),
949 };
950 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
951 if !state_ptr.state.borrow().is_maximized() && cursor_point.y >= 0 && cursor_point.y <= frame_y
952 {
953 return Some(HTTOP as _);
954 }
955
956 Some(HTCLIENT as _)
957}
958
959fn handle_nc_mouse_move_msg(
960 handle: HWND,
961 lparam: LPARAM,
962 state_ptr: Rc<WindowsWindowStatePtr>,
963) -> Option<isize> {
964 start_tracking_mouse(handle, &state_ptr, TME_LEAVE | TME_NONCLIENT);
965
966 let mut lock = state_ptr.state.borrow_mut();
967 let mut func = lock.callbacks.input.take()?;
968 let scale_factor = lock.scale_factor;
969 drop(lock);
970
971 let mut cursor_point = POINT {
972 x: lparam.signed_loword().into(),
973 y: lparam.signed_hiword().into(),
974 };
975 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
976 let input = PlatformInput::MouseMove(MouseMoveEvent {
977 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
978 pressed_button: None,
979 modifiers: current_modifiers(),
980 });
981 let handled = !func(input).propagate;
982 state_ptr.state.borrow_mut().callbacks.input = Some(func);
983
984 if handled { Some(0) } else { None }
985}
986
987fn handle_nc_mouse_down_msg(
988 handle: HWND,
989 button: MouseButton,
990 wparam: WPARAM,
991 lparam: LPARAM,
992 state_ptr: Rc<WindowsWindowStatePtr>,
993) -> Option<isize> {
994 let mut lock = state_ptr.state.borrow_mut();
995 if let Some(mut func) = lock.callbacks.input.take() {
996 let scale_factor = lock.scale_factor;
997 let mut cursor_point = POINT {
998 x: lparam.signed_loword().into(),
999 y: lparam.signed_hiword().into(),
1000 };
1001 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1002 let physical_point = point(DevicePixels(cursor_point.x), DevicePixels(cursor_point.y));
1003 let click_count = lock.click_state.update(button, physical_point);
1004 drop(lock);
1005
1006 let input = PlatformInput::MouseDown(MouseDownEvent {
1007 button,
1008 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1009 modifiers: current_modifiers(),
1010 click_count,
1011 first_mouse: false,
1012 });
1013 let result = func(input.clone());
1014 let handled = !result.propagate || result.default_prevented;
1015 state_ptr.state.borrow_mut().callbacks.input = Some(func);
1016
1017 if handled {
1018 return Some(0);
1019 }
1020 } else {
1021 drop(lock);
1022 };
1023
1024 // Since these are handled in handle_nc_mouse_up_msg we must prevent the default window proc
1025 if button == MouseButton::Left {
1026 match wparam.0 as u32 {
1027 HTMINBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMINBUTTON),
1028 HTMAXBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMAXBUTTON),
1029 HTCLOSE => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTCLOSE),
1030 _ => return None,
1031 };
1032 Some(0)
1033 } else {
1034 None
1035 }
1036}
1037
1038fn handle_nc_mouse_up_msg(
1039 handle: HWND,
1040 button: MouseButton,
1041 wparam: WPARAM,
1042 lparam: LPARAM,
1043 state_ptr: Rc<WindowsWindowStatePtr>,
1044) -> Option<isize> {
1045 let mut lock = state_ptr.state.borrow_mut();
1046 if let Some(mut func) = lock.callbacks.input.take() {
1047 let scale_factor = lock.scale_factor;
1048 drop(lock);
1049
1050 let mut cursor_point = POINT {
1051 x: lparam.signed_loword().into(),
1052 y: lparam.signed_hiword().into(),
1053 };
1054 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1055 let input = PlatformInput::MouseUp(MouseUpEvent {
1056 button,
1057 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1058 modifiers: current_modifiers(),
1059 click_count: 1,
1060 });
1061 let handled = !func(input).propagate;
1062 state_ptr.state.borrow_mut().callbacks.input = Some(func);
1063
1064 if handled {
1065 return Some(0);
1066 }
1067 } else {
1068 drop(lock);
1069 }
1070
1071 let last_pressed = state_ptr.state.borrow_mut().nc_button_pressed.take();
1072 if button == MouseButton::Left
1073 && let Some(last_pressed) = last_pressed
1074 {
1075 let handled = match (wparam.0 as u32, last_pressed) {
1076 (HTMINBUTTON, HTMINBUTTON) => {
1077 unsafe { ShowWindowAsync(handle, SW_MINIMIZE).ok().log_err() };
1078 true
1079 }
1080 (HTMAXBUTTON, HTMAXBUTTON) => {
1081 if state_ptr.state.borrow().is_maximized() {
1082 unsafe { ShowWindowAsync(handle, SW_NORMAL).ok().log_err() };
1083 } else {
1084 unsafe { ShowWindowAsync(handle, SW_MAXIMIZE).ok().log_err() };
1085 }
1086 true
1087 }
1088 (HTCLOSE, HTCLOSE) => {
1089 unsafe {
1090 PostMessageW(Some(handle), WM_CLOSE, WPARAM::default(), LPARAM::default())
1091 .log_err()
1092 };
1093 true
1094 }
1095 _ => false,
1096 };
1097 if handled {
1098 return Some(0);
1099 }
1100 }
1101
1102 None
1103}
1104
1105fn handle_cursor_changed(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1106 let mut state = state_ptr.state.borrow_mut();
1107 let had_cursor = state.current_cursor.is_some();
1108
1109 state.current_cursor = if lparam.0 == 0 {
1110 None
1111 } else {
1112 Some(HCURSOR(lparam.0 as _))
1113 };
1114
1115 if had_cursor != state.current_cursor.is_some() {
1116 unsafe { SetCursor(state.current_cursor) };
1117 }
1118
1119 Some(0)
1120}
1121
1122fn handle_set_cursor(
1123 handle: HWND,
1124 lparam: LPARAM,
1125 state_ptr: Rc<WindowsWindowStatePtr>,
1126) -> Option<isize> {
1127 if unsafe { !IsWindowEnabled(handle).as_bool() }
1128 || matches!(
1129 lparam.loword() as u32,
1130 HTLEFT
1131 | HTRIGHT
1132 | HTTOP
1133 | HTTOPLEFT
1134 | HTTOPRIGHT
1135 | HTBOTTOM
1136 | HTBOTTOMLEFT
1137 | HTBOTTOMRIGHT
1138 )
1139 {
1140 return None;
1141 }
1142 unsafe {
1143 SetCursor(state_ptr.state.borrow().current_cursor);
1144 };
1145 Some(1)
1146}
1147
1148fn handle_system_settings_changed(
1149 handle: HWND,
1150 wparam: WPARAM,
1151 lparam: LPARAM,
1152 state_ptr: Rc<WindowsWindowStatePtr>,
1153) -> Option<isize> {
1154 if wparam.0 != 0 {
1155 let mut lock = state_ptr.state.borrow_mut();
1156 let display = lock.display;
1157 lock.system_settings.update(display, wparam.0);
1158 lock.click_state.system_update(wparam.0);
1159 lock.border_offset.update(handle).log_err();
1160 } else {
1161 handle_system_theme_changed(handle, lparam, state_ptr)?;
1162 };
1163 // Force to trigger WM_NCCALCSIZE event to ensure that we handle auto hide
1164 // taskbar correctly.
1165 notify_frame_changed(handle);
1166
1167 Some(0)
1168}
1169
1170fn handle_system_command(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1171 if wparam.0 == SC_KEYMENU as usize {
1172 let mut lock = state_ptr.state.borrow_mut();
1173 if lock.system_key_handled {
1174 lock.system_key_handled = false;
1175 return Some(0);
1176 }
1177 }
1178 None
1179}
1180
1181fn handle_system_theme_changed(
1182 handle: HWND,
1183 lparam: LPARAM,
1184 state_ptr: Rc<WindowsWindowStatePtr>,
1185) -> Option<isize> {
1186 // lParam is a pointer to a string that indicates the area containing the system parameter
1187 // that was changed.
1188 let parameter = PCWSTR::from_raw(lparam.0 as _);
1189 if unsafe { !parameter.is_null() && !parameter.is_empty() } {
1190 if let Some(parameter_string) = unsafe { parameter.to_string() }.log_err() {
1191 log::info!("System settings changed: {}", parameter_string);
1192 match parameter_string.as_str() {
1193 "ImmersiveColorSet" => {
1194 let new_appearance = system_appearance()
1195 .context("unable to get system appearance when handling ImmersiveColorSet")
1196 .log_err()?;
1197 let mut lock = state_ptr.state.borrow_mut();
1198 if new_appearance != lock.appearance {
1199 lock.appearance = new_appearance;
1200 let mut callback = lock.callbacks.appearance_changed.take()?;
1201 drop(lock);
1202 callback();
1203 state_ptr.state.borrow_mut().callbacks.appearance_changed = Some(callback);
1204 configure_dwm_dark_mode(handle, new_appearance);
1205 }
1206 }
1207 _ => {}
1208 }
1209 }
1210 }
1211 Some(0)
1212}
1213
1214fn handle_input_language_changed(
1215 lparam: LPARAM,
1216 state_ptr: Rc<WindowsWindowStatePtr>,
1217) -> Option<isize> {
1218 let thread = state_ptr.main_thread_id_win32;
1219 let validation = state_ptr.validation_number;
1220 unsafe {
1221 PostThreadMessageW(thread, WM_INPUTLANGCHANGE, WPARAM(validation), lparam).log_err();
1222 }
1223 Some(0)
1224}
1225
1226#[inline]
1227fn parse_char_message(wparam: WPARAM, state_ptr: &Rc<WindowsWindowStatePtr>) -> Option<String> {
1228 let code_point = wparam.loword();
1229 let mut lock = state_ptr.state.borrow_mut();
1230 // https://www.unicode.org/versions/Unicode16.0.0/core-spec/chapter-3/#G2630
1231 match code_point {
1232 0xD800..=0xDBFF => {
1233 // High surrogate, wait for low surrogate
1234 lock.pending_surrogate = Some(code_point);
1235 None
1236 }
1237 0xDC00..=0xDFFF => {
1238 if let Some(high_surrogate) = lock.pending_surrogate.take() {
1239 // Low surrogate, combine with pending high surrogate
1240 String::from_utf16(&[high_surrogate, code_point]).ok()
1241 } else {
1242 // Invalid low surrogate without a preceding high surrogate
1243 log::warn!(
1244 "Received low surrogate without a preceding high surrogate: {code_point:x}"
1245 );
1246 None
1247 }
1248 }
1249 _ => {
1250 lock.pending_surrogate = None;
1251 char::from_u32(code_point as u32)
1252 .filter(|c| !c.is_control())
1253 .map(|c| c.to_string())
1254 }
1255 }
1256}
1257
1258#[inline]
1259fn translate_message(handle: HWND, wparam: WPARAM, lparam: LPARAM) {
1260 let msg = MSG {
1261 hwnd: handle,
1262 message: WM_KEYDOWN,
1263 wParam: wparam,
1264 lParam: lparam,
1265 // It seems like leaving the following two parameters empty doesn't break key events, they still work as expected.
1266 // But if any bugs pop up after this PR, this is probably the place to look first.
1267 time: 0,
1268 pt: POINT::default(),
1269 };
1270 unsafe { TranslateMessage(&msg).ok().log_err() };
1271}
1272
1273fn handle_key_event<F>(
1274 handle: HWND,
1275 wparam: WPARAM,
1276 lparam: LPARAM,
1277 state: &mut WindowsWindowState,
1278 f: F,
1279) -> Option<PlatformInput>
1280where
1281 F: FnOnce(Keystroke) -> PlatformInput,
1282{
1283 let virtual_key = VIRTUAL_KEY(wparam.loword());
1284 let mut modifiers = current_modifiers();
1285
1286 match virtual_key {
1287 VK_SHIFT | VK_CONTROL | VK_MENU | VK_LWIN | VK_RWIN => {
1288 if state
1289 .last_reported_modifiers
1290 .is_some_and(|prev_modifiers| prev_modifiers == modifiers)
1291 {
1292 return None;
1293 }
1294 state.last_reported_modifiers = Some(modifiers);
1295 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1296 modifiers,
1297 capslock: current_capslock(),
1298 }))
1299 }
1300 VK_PACKET => {
1301 translate_message(handle, wparam, lparam);
1302 None
1303 }
1304 VK_CAPITAL => {
1305 let capslock = current_capslock();
1306 if state
1307 .last_reported_capslock
1308 .is_some_and(|prev_capslock| prev_capslock == capslock)
1309 {
1310 return None;
1311 }
1312 state.last_reported_capslock = Some(capslock);
1313 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1314 modifiers,
1315 capslock,
1316 }))
1317 }
1318 vkey => {
1319 let vkey = if vkey == VK_PROCESSKEY {
1320 VIRTUAL_KEY(unsafe { ImmGetVirtualKey(handle) } as u16)
1321 } else {
1322 vkey
1323 };
1324 let keystroke = parse_normal_key(vkey, lparam, modifiers)?;
1325 Some(f(keystroke))
1326 }
1327 }
1328}
1329
1330fn parse_immutable(vkey: VIRTUAL_KEY) -> Option<String> {
1331 Some(
1332 match vkey {
1333 VK_SPACE => "space",
1334 VK_BACK => "backspace",
1335 VK_RETURN => "enter",
1336 VK_TAB => "tab",
1337 VK_UP => "up",
1338 VK_DOWN => "down",
1339 VK_RIGHT => "right",
1340 VK_LEFT => "left",
1341 VK_HOME => "home",
1342 VK_END => "end",
1343 VK_PRIOR => "pageup",
1344 VK_NEXT => "pagedown",
1345 VK_BROWSER_BACK => "back",
1346 VK_BROWSER_FORWARD => "forward",
1347 VK_ESCAPE => "escape",
1348 VK_INSERT => "insert",
1349 VK_DELETE => "delete",
1350 VK_APPS => "menu",
1351 VK_F1 => "f1",
1352 VK_F2 => "f2",
1353 VK_F3 => "f3",
1354 VK_F4 => "f4",
1355 VK_F5 => "f5",
1356 VK_F6 => "f6",
1357 VK_F7 => "f7",
1358 VK_F8 => "f8",
1359 VK_F9 => "f9",
1360 VK_F10 => "f10",
1361 VK_F11 => "f11",
1362 VK_F12 => "f12",
1363 VK_F13 => "f13",
1364 VK_F14 => "f14",
1365 VK_F15 => "f15",
1366 VK_F16 => "f16",
1367 VK_F17 => "f17",
1368 VK_F18 => "f18",
1369 VK_F19 => "f19",
1370 VK_F20 => "f20",
1371 VK_F21 => "f21",
1372 VK_F22 => "f22",
1373 VK_F23 => "f23",
1374 VK_F24 => "f24",
1375 _ => return None,
1376 }
1377 .to_string(),
1378 )
1379}
1380
1381fn parse_normal_key(
1382 vkey: VIRTUAL_KEY,
1383 lparam: LPARAM,
1384 mut modifiers: Modifiers,
1385) -> Option<Keystroke> {
1386 let mut key_char = None;
1387 let key = parse_immutable(vkey).or_else(|| {
1388 let scan_code = lparam.hiword() & 0xFF;
1389 key_char = generate_key_char(
1390 vkey,
1391 scan_code as u32,
1392 modifiers.control,
1393 modifiers.shift,
1394 modifiers.alt,
1395 );
1396 get_keystroke_key(vkey, scan_code as u32, &mut modifiers)
1397 })?;
1398 Some(Keystroke {
1399 modifiers,
1400 key,
1401 key_char,
1402 })
1403}
1404
1405fn parse_ime_composition_string(ctx: HIMC, comp_type: IME_COMPOSITION_STRING) -> Option<String> {
1406 unsafe {
1407 let string_len = ImmGetCompositionStringW(ctx, comp_type, None, 0);
1408 if string_len >= 0 {
1409 let mut buffer = vec![0u8; string_len as usize + 2];
1410 ImmGetCompositionStringW(
1411 ctx,
1412 comp_type,
1413 Some(buffer.as_mut_ptr() as _),
1414 string_len as _,
1415 );
1416 let wstring = std::slice::from_raw_parts::<u16>(
1417 buffer.as_mut_ptr().cast::<u16>(),
1418 string_len as usize / 2,
1419 );
1420 Some(String::from_utf16_lossy(wstring))
1421 } else {
1422 None
1423 }
1424 }
1425}
1426
1427#[inline]
1428fn retrieve_composition_cursor_position(ctx: HIMC) -> usize {
1429 unsafe { ImmGetCompositionStringW(ctx, GCS_CURSORPOS, None, 0) as usize }
1430}
1431
1432#[inline]
1433fn is_virtual_key_pressed(vkey: VIRTUAL_KEY) -> bool {
1434 unsafe { GetKeyState(vkey.0 as i32) < 0 }
1435}
1436
1437#[inline]
1438pub(crate) fn current_modifiers() -> Modifiers {
1439 Modifiers {
1440 control: is_virtual_key_pressed(VK_CONTROL),
1441 alt: is_virtual_key_pressed(VK_MENU),
1442 shift: is_virtual_key_pressed(VK_SHIFT),
1443 platform: is_virtual_key_pressed(VK_LWIN) || is_virtual_key_pressed(VK_RWIN),
1444 function: false,
1445 }
1446}
1447
1448#[inline]
1449pub(crate) fn current_capslock() -> Capslock {
1450 let on = unsafe { GetKeyState(VK_CAPITAL.0 as i32) & 1 } > 0;
1451 Capslock { on: on }
1452}
1453
1454fn get_client_area_insets(
1455 handle: HWND,
1456 is_maximized: bool,
1457 windows_version: WindowsVersion,
1458) -> RECT {
1459 // For maximized windows, Windows outdents the window rect from the screen's client rect
1460 // by `frame_thickness` on each edge, meaning `insets` must contain `frame_thickness`
1461 // on all sides (including the top) to avoid the client area extending onto adjacent
1462 // monitors.
1463 //
1464 // For non-maximized windows, things become complicated:
1465 //
1466 // - On Windows 10
1467 // The top inset must be zero, since if there is any nonclient area, Windows will draw
1468 // a full native titlebar outside the client area. (This doesn't occur in the maximized
1469 // case.)
1470 //
1471 // - On Windows 11
1472 // The top inset is calculated using an empirical formula that I derived through various
1473 // tests. Without this, the top 1-2 rows of pixels in our window would be obscured.
1474 let dpi = unsafe { GetDpiForWindow(handle) };
1475 let frame_thickness = get_frame_thickness(dpi);
1476 let top_insets = if is_maximized {
1477 frame_thickness
1478 } else {
1479 match windows_version {
1480 WindowsVersion::Win10 => 0,
1481 WindowsVersion::Win11 => (dpi as f32 / USER_DEFAULT_SCREEN_DPI as f32).round() as i32,
1482 }
1483 };
1484 RECT {
1485 left: frame_thickness,
1486 top: top_insets,
1487 right: frame_thickness,
1488 bottom: frame_thickness,
1489 }
1490}
1491
1492// there is some additional non-visible space when talking about window
1493// borders on Windows:
1494// - SM_CXSIZEFRAME: The resize handle.
1495// - SM_CXPADDEDBORDER: Additional border space that isn't part of the resize handle.
1496fn get_frame_thickness(dpi: u32) -> i32 {
1497 let resize_frame_thickness = unsafe { GetSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) };
1498 let padding_thickness = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
1499 resize_frame_thickness + padding_thickness
1500}
1501
1502fn notify_frame_changed(handle: HWND) {
1503 unsafe {
1504 SetWindowPos(
1505 handle,
1506 None,
1507 0,
1508 0,
1509 0,
1510 0,
1511 SWP_FRAMECHANGED
1512 | SWP_NOACTIVATE
1513 | SWP_NOCOPYBITS
1514 | SWP_NOMOVE
1515 | SWP_NOOWNERZORDER
1516 | SWP_NOREPOSITION
1517 | SWP_NOSENDCHANGING
1518 | SWP_NOSIZE
1519 | SWP_NOZORDER,
1520 )
1521 .log_err();
1522 }
1523}
1524
1525fn start_tracking_mouse(
1526 handle: HWND,
1527 state_ptr: &Rc<WindowsWindowStatePtr>,
1528 flags: TRACKMOUSEEVENT_FLAGS,
1529) {
1530 let mut lock = state_ptr.state.borrow_mut();
1531 if !lock.hovered {
1532 lock.hovered = true;
1533 unsafe {
1534 TrackMouseEvent(&mut TRACKMOUSEEVENT {
1535 cbSize: std::mem::size_of::<TRACKMOUSEEVENT>() as u32,
1536 dwFlags: flags,
1537 hwndTrack: handle,
1538 dwHoverTime: HOVER_DEFAULT,
1539 })
1540 .log_err()
1541 };
1542 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
1543 drop(lock);
1544 callback(true);
1545 state_ptr.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
1546 }
1547 }
1548}
1549
1550fn with_input_handler<F, R>(state_ptr: &Rc<WindowsWindowStatePtr>, f: F) -> Option<R>
1551where
1552 F: FnOnce(&mut PlatformInputHandler) -> R,
1553{
1554 let mut input_handler = state_ptr.state.borrow_mut().input_handler.take()?;
1555 let result = f(&mut input_handler);
1556 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
1557 Some(result)
1558}
1559
1560fn with_input_handler_and_scale_factor<F, R>(
1561 state_ptr: &Rc<WindowsWindowStatePtr>,
1562 f: F,
1563) -> Option<R>
1564where
1565 F: FnOnce(&mut PlatformInputHandler, f32) -> Option<R>,
1566{
1567 let mut lock = state_ptr.state.borrow_mut();
1568 let mut input_handler = lock.input_handler.take()?;
1569 let scale_factor = lock.scale_factor;
1570 drop(lock);
1571 let result = f(&mut input_handler, scale_factor);
1572 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
1573 result
1574}