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.renderer.resize(new_size).log_err();
187 lock.callbacks.request_frame = lock.restore_from_minimized.take();
188 } else {
189 // lock.renderer.update_drawable_size(new_size);
190 lock.renderer.resize(new_size).log_err();
191 }
192 let new_size = new_size.to_pixels(scale_factor);
193 lock.logical_size = new_size;
194 if let Some(mut callback) = lock.callbacks.resize.take() {
195 drop(lock);
196 callback(new_size, scale_factor);
197 state_ptr.state.borrow_mut().callbacks.resize = Some(callback);
198 }
199 Some(0)
200}
201
202fn handle_size_move_loop(handle: HWND) -> Option<isize> {
203 unsafe {
204 let ret = SetTimer(
205 Some(handle),
206 SIZE_MOVE_LOOP_TIMER_ID,
207 USER_TIMER_MINIMUM,
208 None,
209 );
210 if ret == 0 {
211 log::error!(
212 "unable to create timer: {}",
213 std::io::Error::last_os_error()
214 );
215 }
216 }
217 None
218}
219
220fn handle_size_move_loop_exit(handle: HWND) -> Option<isize> {
221 unsafe {
222 KillTimer(Some(handle), SIZE_MOVE_LOOP_TIMER_ID).log_err();
223 }
224 None
225}
226
227fn handle_timer_msg(
228 handle: HWND,
229 wparam: WPARAM,
230 state_ptr: Rc<WindowsWindowStatePtr>,
231) -> Option<isize> {
232 if wparam.0 == SIZE_MOVE_LOOP_TIMER_ID {
233 for runnable in state_ptr.main_receiver.drain() {
234 runnable.run();
235 }
236 handle_paint_msg(handle, state_ptr)
237 } else {
238 None
239 }
240}
241
242fn handle_paint_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
243 let mut lock = state_ptr.state.borrow_mut();
244 if let Some(mut request_frame) = lock.callbacks.request_frame.take() {
245 drop(lock);
246 request_frame(Default::default());
247 state_ptr.state.borrow_mut().callbacks.request_frame = Some(request_frame);
248 }
249 unsafe { ValidateRect(Some(handle), None).ok().log_err() };
250 Some(0)
251}
252
253fn handle_close_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
254 let mut lock = state_ptr.state.borrow_mut();
255 let output = if let Some(mut callback) = lock.callbacks.should_close.take() {
256 drop(lock);
257 let should_close = callback();
258 state_ptr.state.borrow_mut().callbacks.should_close = Some(callback);
259 if should_close { None } else { Some(0) }
260 } else {
261 None
262 };
263
264 // Workaround as window close animation is not played with `WS_EX_LAYERED` enabled.
265 if output.is_none() {
266 unsafe {
267 let current_style = get_window_long(handle, GWL_EXSTYLE);
268 set_window_long(
269 handle,
270 GWL_EXSTYLE,
271 current_style & !WS_EX_LAYERED.0 as isize,
272 );
273 }
274 }
275
276 output
277}
278
279fn handle_destroy_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
280 let callback = {
281 let mut lock = state_ptr.state.borrow_mut();
282 lock.callbacks.close.take()
283 };
284 if let Some(callback) = callback {
285 callback();
286 }
287 unsafe {
288 PostThreadMessageW(
289 state_ptr.main_thread_id_win32,
290 WM_GPUI_CLOSE_ONE_WINDOW,
291 WPARAM(state_ptr.validation_number),
292 LPARAM(handle.0 as isize),
293 )
294 .log_err();
295 }
296 Some(0)
297}
298
299fn handle_mouse_move_msg(
300 handle: HWND,
301 lparam: LPARAM,
302 wparam: WPARAM,
303 state_ptr: Rc<WindowsWindowStatePtr>,
304) -> Option<isize> {
305 start_tracking_mouse(handle, &state_ptr, TME_LEAVE);
306
307 let mut lock = state_ptr.state.borrow_mut();
308 let Some(mut func) = lock.callbacks.input.take() else {
309 return Some(1);
310 };
311 let scale_factor = lock.scale_factor;
312 drop(lock);
313
314 let pressed_button = match MODIFIERKEYS_FLAGS(wparam.loword() as u32) {
315 flags if flags.contains(MK_LBUTTON) => Some(MouseButton::Left),
316 flags if flags.contains(MK_RBUTTON) => Some(MouseButton::Right),
317 flags if flags.contains(MK_MBUTTON) => Some(MouseButton::Middle),
318 flags if flags.contains(MK_XBUTTON1) => {
319 Some(MouseButton::Navigate(NavigationDirection::Back))
320 }
321 flags if flags.contains(MK_XBUTTON2) => {
322 Some(MouseButton::Navigate(NavigationDirection::Forward))
323 }
324 _ => None,
325 };
326 let x = lparam.signed_loword() as f32;
327 let y = lparam.signed_hiword() as f32;
328 let input = PlatformInput::MouseMove(MouseMoveEvent {
329 position: logical_point(x, y, scale_factor),
330 pressed_button,
331 modifiers: current_modifiers(),
332 });
333 let handled = !func(input).propagate;
334 state_ptr.state.borrow_mut().callbacks.input = Some(func);
335
336 if handled { Some(0) } else { Some(1) }
337}
338
339fn handle_mouse_leave_msg(state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
340 let mut lock = state_ptr.state.borrow_mut();
341 lock.hovered = false;
342 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
343 drop(lock);
344 callback(false);
345 state_ptr.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
346 }
347
348 Some(0)
349}
350
351fn handle_syskeydown_msg(
352 handle: HWND,
353 wparam: WPARAM,
354 lparam: LPARAM,
355 state_ptr: Rc<WindowsWindowStatePtr>,
356) -> Option<isize> {
357 let mut lock = state_ptr.state.borrow_mut();
358 let input = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
359 PlatformInput::KeyDown(KeyDownEvent {
360 keystroke,
361 is_held: lparam.0 & (0x1 << 30) > 0,
362 })
363 })?;
364 let mut func = lock.callbacks.input.take()?;
365 drop(lock);
366
367 let handled = !func(input).propagate;
368
369 let mut lock = state_ptr.state.borrow_mut();
370 lock.callbacks.input = Some(func);
371
372 if handled {
373 lock.system_key_handled = true;
374 Some(0)
375 } else {
376 // we need to call `DefWindowProcW`, or we will lose the system-wide `Alt+F4`, `Alt+{other keys}`
377 // shortcuts.
378 None
379 }
380}
381
382fn handle_syskeyup_msg(
383 handle: HWND,
384 wparam: WPARAM,
385 lparam: LPARAM,
386 state_ptr: Rc<WindowsWindowStatePtr>,
387) -> Option<isize> {
388 let mut lock = state_ptr.state.borrow_mut();
389 let input = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
390 PlatformInput::KeyUp(KeyUpEvent { keystroke })
391 })?;
392 let mut func = lock.callbacks.input.take()?;
393 drop(lock);
394 func(input);
395 state_ptr.state.borrow_mut().callbacks.input = Some(func);
396
397 // Always return 0 to indicate that the message was handled, so we could properly handle `ModifiersChanged` event.
398 Some(0)
399}
400
401// It's a known bug that you can't trigger `ctrl-shift-0`. See:
402// https://superuser.com/questions/1455762/ctrl-shift-number-key-combination-has-stopped-working-for-a-few-numbers
403fn handle_keydown_msg(
404 handle: HWND,
405 wparam: WPARAM,
406 lparam: LPARAM,
407 state_ptr: Rc<WindowsWindowStatePtr>,
408) -> Option<isize> {
409 let mut lock = state_ptr.state.borrow_mut();
410 let Some(input) = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
411 PlatformInput::KeyDown(KeyDownEvent {
412 keystroke,
413 is_held: lparam.0 & (0x1 << 30) > 0,
414 })
415 }) else {
416 return Some(1);
417 };
418 drop(lock);
419
420 let is_composing = with_input_handler(&state_ptr, |input_handler| {
421 input_handler.marked_text_range()
422 })
423 .flatten()
424 .is_some();
425 if is_composing {
426 translate_message(handle, wparam, lparam);
427 return Some(0);
428 }
429
430 let Some(mut func) = state_ptr.state.borrow_mut().callbacks.input.take() else {
431 return Some(1);
432 };
433
434 let handled = !func(input).propagate;
435
436 state_ptr.state.borrow_mut().callbacks.input = Some(func);
437
438 if handled {
439 Some(0)
440 } else {
441 translate_message(handle, wparam, lparam);
442 Some(1)
443 }
444}
445
446fn handle_keyup_msg(
447 handle: HWND,
448 wparam: WPARAM,
449 lparam: LPARAM,
450 state_ptr: Rc<WindowsWindowStatePtr>,
451) -> Option<isize> {
452 let mut lock = state_ptr.state.borrow_mut();
453 let Some(input) = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
454 PlatformInput::KeyUp(KeyUpEvent { keystroke })
455 }) else {
456 return Some(1);
457 };
458
459 let Some(mut func) = lock.callbacks.input.take() else {
460 return Some(1);
461 };
462 drop(lock);
463
464 let handled = !func(input).propagate;
465 state_ptr.state.borrow_mut().callbacks.input = Some(func);
466
467 if handled { Some(0) } else { Some(1) }
468}
469
470fn handle_char_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
471 let input = parse_char_message(wparam, &state_ptr)?;
472 with_input_handler(&state_ptr, |input_handler| {
473 input_handler.replace_text_in_range(None, &input);
474 });
475
476 Some(0)
477}
478
479fn handle_dead_char_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
480 let ch = char::from_u32(wparam.0 as u32)?.to_string();
481 with_input_handler(&state_ptr, |input_handler| {
482 input_handler.replace_and_mark_text_in_range(None, &ch, None);
483 });
484 None
485}
486
487fn handle_mouse_down_msg(
488 handle: HWND,
489 button: MouseButton,
490 lparam: LPARAM,
491 state_ptr: Rc<WindowsWindowStatePtr>,
492) -> Option<isize> {
493 unsafe { SetCapture(handle) };
494 let mut lock = state_ptr.state.borrow_mut();
495 let Some(mut func) = lock.callbacks.input.take() else {
496 return Some(1);
497 };
498 let x = lparam.signed_loword();
499 let y = lparam.signed_hiword();
500 let physical_point = point(DevicePixels(x as i32), DevicePixels(y as i32));
501 let click_count = lock.click_state.update(button, physical_point);
502 let scale_factor = lock.scale_factor;
503 drop(lock);
504
505 let input = PlatformInput::MouseDown(MouseDownEvent {
506 button,
507 position: logical_point(x as f32, y as f32, scale_factor),
508 modifiers: current_modifiers(),
509 click_count,
510 first_mouse: false,
511 });
512 let handled = !func(input).propagate;
513 state_ptr.state.borrow_mut().callbacks.input = Some(func);
514
515 if handled { Some(0) } else { Some(1) }
516}
517
518fn handle_mouse_up_msg(
519 _handle: HWND,
520 button: MouseButton,
521 lparam: LPARAM,
522 state_ptr: Rc<WindowsWindowStatePtr>,
523) -> Option<isize> {
524 unsafe { ReleaseCapture().log_err() };
525 let mut lock = state_ptr.state.borrow_mut();
526 let Some(mut func) = lock.callbacks.input.take() else {
527 return Some(1);
528 };
529 let x = lparam.signed_loword() as f32;
530 let y = lparam.signed_hiword() as f32;
531 let click_count = lock.click_state.current_count;
532 let scale_factor = lock.scale_factor;
533 drop(lock);
534
535 let input = PlatformInput::MouseUp(MouseUpEvent {
536 button,
537 position: logical_point(x, y, scale_factor),
538 modifiers: current_modifiers(),
539 click_count,
540 });
541 let handled = !func(input).propagate;
542 state_ptr.state.borrow_mut().callbacks.input = Some(func);
543
544 if handled { Some(0) } else { Some(1) }
545}
546
547fn handle_xbutton_msg(
548 handle: HWND,
549 wparam: WPARAM,
550 lparam: LPARAM,
551 handler: impl Fn(HWND, MouseButton, LPARAM, Rc<WindowsWindowStatePtr>) -> Option<isize>,
552 state_ptr: Rc<WindowsWindowStatePtr>,
553) -> Option<isize> {
554 let nav_dir = match wparam.hiword() {
555 XBUTTON1 => NavigationDirection::Back,
556 XBUTTON2 => NavigationDirection::Forward,
557 _ => return Some(1),
558 };
559 handler(handle, MouseButton::Navigate(nav_dir), lparam, state_ptr)
560}
561
562fn handle_mouse_wheel_msg(
563 handle: HWND,
564 wparam: WPARAM,
565 lparam: LPARAM,
566 state_ptr: Rc<WindowsWindowStatePtr>,
567) -> Option<isize> {
568 let modifiers = current_modifiers();
569 let mut lock = state_ptr.state.borrow_mut();
570 let Some(mut func) = lock.callbacks.input.take() else {
571 return Some(1);
572 };
573 let scale_factor = lock.scale_factor;
574 let wheel_scroll_amount = match modifiers.shift {
575 true => lock.system_settings.mouse_wheel_settings.wheel_scroll_chars,
576 false => lock.system_settings.mouse_wheel_settings.wheel_scroll_lines,
577 };
578 drop(lock);
579
580 let wheel_distance =
581 (wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_amount as f32;
582 let mut cursor_point = POINT {
583 x: lparam.signed_loword().into(),
584 y: lparam.signed_hiword().into(),
585 };
586 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
587 let input = PlatformInput::ScrollWheel(ScrollWheelEvent {
588 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
589 delta: ScrollDelta::Lines(match modifiers.shift {
590 true => Point {
591 x: wheel_distance,
592 y: 0.0,
593 },
594 false => Point {
595 y: wheel_distance,
596 x: 0.0,
597 },
598 }),
599 modifiers,
600 touch_phase: TouchPhase::Moved,
601 });
602 let handled = !func(input).propagate;
603 state_ptr.state.borrow_mut().callbacks.input = Some(func);
604
605 if handled { Some(0) } else { Some(1) }
606}
607
608fn handle_mouse_horizontal_wheel_msg(
609 handle: HWND,
610 wparam: WPARAM,
611 lparam: LPARAM,
612 state_ptr: Rc<WindowsWindowStatePtr>,
613) -> Option<isize> {
614 let mut lock = state_ptr.state.borrow_mut();
615 let Some(mut func) = lock.callbacks.input.take() else {
616 return Some(1);
617 };
618 let scale_factor = lock.scale_factor;
619 let wheel_scroll_chars = lock.system_settings.mouse_wheel_settings.wheel_scroll_chars;
620 drop(lock);
621
622 let wheel_distance =
623 (-wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_chars as f32;
624 let mut cursor_point = POINT {
625 x: lparam.signed_loword().into(),
626 y: lparam.signed_hiword().into(),
627 };
628 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
629 let event = PlatformInput::ScrollWheel(ScrollWheelEvent {
630 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
631 delta: ScrollDelta::Lines(Point {
632 x: wheel_distance,
633 y: 0.0,
634 }),
635 modifiers: current_modifiers(),
636 touch_phase: TouchPhase::Moved,
637 });
638 let handled = !func(event).propagate;
639 state_ptr.state.borrow_mut().callbacks.input = Some(func);
640
641 if handled { Some(0) } else { Some(1) }
642}
643
644fn retrieve_caret_position(state_ptr: &Rc<WindowsWindowStatePtr>) -> Option<POINT> {
645 with_input_handler_and_scale_factor(state_ptr, |input_handler, scale_factor| {
646 let caret_range = input_handler.selected_text_range(false)?;
647 let caret_position = input_handler.bounds_for_range(caret_range.range)?;
648 Some(POINT {
649 // logical to physical
650 x: (caret_position.origin.x.0 * scale_factor) as i32,
651 y: (caret_position.origin.y.0 * scale_factor) as i32
652 + ((caret_position.size.height.0 * scale_factor) as i32 / 2),
653 })
654 })
655}
656
657fn handle_ime_position(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
658 unsafe {
659 let ctx = ImmGetContext(handle);
660
661 let Some(caret_position) = retrieve_caret_position(&state_ptr) else {
662 return Some(0);
663 };
664 {
665 let config = COMPOSITIONFORM {
666 dwStyle: CFS_POINT,
667 ptCurrentPos: caret_position,
668 ..Default::default()
669 };
670 ImmSetCompositionWindow(ctx, &config as _).ok().log_err();
671 }
672 {
673 let config = CANDIDATEFORM {
674 dwStyle: CFS_CANDIDATEPOS,
675 ptCurrentPos: caret_position,
676 ..Default::default()
677 };
678 ImmSetCandidateWindow(ctx, &config as _).ok().log_err();
679 }
680 ImmReleaseContext(handle, ctx).ok().log_err();
681 Some(0)
682 }
683}
684
685fn handle_ime_composition(
686 handle: HWND,
687 lparam: LPARAM,
688 state_ptr: Rc<WindowsWindowStatePtr>,
689) -> Option<isize> {
690 let ctx = unsafe { ImmGetContext(handle) };
691 let result = handle_ime_composition_inner(ctx, lparam, state_ptr);
692 unsafe { ImmReleaseContext(handle, ctx).ok().log_err() };
693 result
694}
695
696fn handle_ime_composition_inner(
697 ctx: HIMC,
698 lparam: LPARAM,
699 state_ptr: Rc<WindowsWindowStatePtr>,
700) -> Option<isize> {
701 let lparam = lparam.0 as u32;
702 if lparam == 0 {
703 // Japanese IME may send this message with lparam = 0, which indicates that
704 // there is no composition string.
705 with_input_handler(&state_ptr, |input_handler| {
706 input_handler.replace_text_in_range(None, "");
707 })?;
708 Some(0)
709 } else {
710 if lparam & GCS_COMPSTR.0 > 0 {
711 let comp_string = parse_ime_composition_string(ctx, GCS_COMPSTR)?;
712 let caret_pos = (!comp_string.is_empty() && lparam & GCS_CURSORPOS.0 > 0).then(|| {
713 let pos = retrieve_composition_cursor_position(ctx);
714 pos..pos
715 });
716 with_input_handler(&state_ptr, |input_handler| {
717 input_handler.replace_and_mark_text_in_range(None, &comp_string, caret_pos);
718 })?;
719 }
720 if lparam & GCS_RESULTSTR.0 > 0 {
721 let comp_result = parse_ime_composition_string(ctx, GCS_RESULTSTR)?;
722 with_input_handler(&state_ptr, |input_handler| {
723 input_handler.replace_text_in_range(None, &comp_result);
724 })?;
725 return Some(0);
726 }
727
728 // currently, we don't care other stuff
729 None
730 }
731}
732
733/// SEE: https://learn.microsoft.com/en-us/windows/win32/winmsg/wm-nccalcsize
734fn handle_calc_client_size(
735 handle: HWND,
736 wparam: WPARAM,
737 lparam: LPARAM,
738 state_ptr: Rc<WindowsWindowStatePtr>,
739) -> Option<isize> {
740 if !state_ptr.hide_title_bar || state_ptr.state.borrow().is_fullscreen() || wparam.0 == 0 {
741 return None;
742 }
743
744 let is_maximized = state_ptr.state.borrow().is_maximized();
745 let insets = get_client_area_insets(handle, is_maximized, state_ptr.windows_version);
746 // wparam is TRUE so lparam points to an NCCALCSIZE_PARAMS structure
747 let mut params = lparam.0 as *mut NCCALCSIZE_PARAMS;
748 let mut requested_client_rect = unsafe { &mut ((*params).rgrc) };
749
750 requested_client_rect[0].left += insets.left;
751 requested_client_rect[0].top += insets.top;
752 requested_client_rect[0].right -= insets.right;
753 requested_client_rect[0].bottom -= insets.bottom;
754
755 // Fix auto hide taskbar not showing. This solution is based on the approach
756 // used by Chrome. However, it may result in one row of pixels being obscured
757 // in our client area. But as Chrome says, "there seems to be no better solution."
758 if is_maximized {
759 if let Some(ref taskbar_position) = state_ptr
760 .state
761 .borrow()
762 .system_settings
763 .auto_hide_taskbar_position
764 {
765 // Fot the auto-hide taskbar, adjust in by 1 pixel on taskbar edge,
766 // so the window isn't treated as a "fullscreen app", which would cause
767 // the taskbar to disappear.
768 match taskbar_position {
769 AutoHideTaskbarPosition::Left => {
770 requested_client_rect[0].left += AUTO_HIDE_TASKBAR_THICKNESS_PX
771 }
772 AutoHideTaskbarPosition::Top => {
773 requested_client_rect[0].top += AUTO_HIDE_TASKBAR_THICKNESS_PX
774 }
775 AutoHideTaskbarPosition::Right => {
776 requested_client_rect[0].right -= AUTO_HIDE_TASKBAR_THICKNESS_PX
777 }
778 AutoHideTaskbarPosition::Bottom => {
779 requested_client_rect[0].bottom -= AUTO_HIDE_TASKBAR_THICKNESS_PX
780 }
781 }
782 }
783 }
784
785 Some(0)
786}
787
788fn handle_activate_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
789 let activated = wparam.loword() > 0;
790 let this = state_ptr.clone();
791 state_ptr
792 .executor
793 .spawn(async move {
794 let mut lock = this.state.borrow_mut();
795 if let Some(mut func) = lock.callbacks.active_status_change.take() {
796 drop(lock);
797 func(activated);
798 this.state.borrow_mut().callbacks.active_status_change = Some(func);
799 }
800 })
801 .detach();
802
803 None
804}
805
806fn handle_create_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
807 if state_ptr.hide_title_bar {
808 notify_frame_changed(handle);
809 Some(0)
810 } else {
811 None
812 }
813}
814
815fn handle_dpi_changed_msg(
816 handle: HWND,
817 wparam: WPARAM,
818 lparam: LPARAM,
819 state_ptr: Rc<WindowsWindowStatePtr>,
820) -> Option<isize> {
821 let new_dpi = wparam.loword() as f32;
822 let mut lock = state_ptr.state.borrow_mut();
823 lock.scale_factor = new_dpi / USER_DEFAULT_SCREEN_DPI as f32;
824 lock.border_offset.update(handle).log_err();
825 drop(lock);
826
827 let rect = unsafe { &*(lparam.0 as *const RECT) };
828 let width = rect.right - rect.left;
829 let height = rect.bottom - rect.top;
830 // this will emit `WM_SIZE` and `WM_MOVE` right here
831 // even before this function returns
832 // the new size is handled in `WM_SIZE`
833 unsafe {
834 SetWindowPos(
835 handle,
836 None,
837 rect.left,
838 rect.top,
839 width,
840 height,
841 SWP_NOZORDER | SWP_NOACTIVATE,
842 )
843 .context("unable to set window position after dpi has changed")
844 .log_err();
845 }
846
847 Some(0)
848}
849
850/// The following conditions will trigger this event:
851/// 1. The monitor on which the window is located goes offline or changes resolution.
852/// 2. Another monitor goes offline, is plugged in, or changes resolution.
853///
854/// In either case, the window will only receive information from the monitor on which
855/// it is located.
856///
857/// For example, in the case of condition 2, where the monitor on which the window is
858/// located has actually changed nothing, it will still receive this event.
859fn handle_display_change_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
860 // NOTE:
861 // Even the `lParam` holds the resolution of the screen, we just ignore it.
862 // Because WM_DPICHANGED, WM_MOVE, WM_SIZE will come first, window reposition and resize
863 // are handled there.
864 // So we only care about if monitor is disconnected.
865 let previous_monitor = state_ptr.state.borrow().display;
866 if WindowsDisplay::is_connected(previous_monitor.handle) {
867 // we are fine, other display changed
868 return None;
869 }
870 // display disconnected
871 // in this case, the OS will move our window to another monitor, and minimize it.
872 // we deminimize the window and query the monitor after moving
873 unsafe {
874 let _ = ShowWindow(handle, SW_SHOWNORMAL);
875 };
876 let new_monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
877 // all monitors disconnected
878 if new_monitor.is_invalid() {
879 log::error!("No monitor detected!");
880 return None;
881 }
882 let new_display = WindowsDisplay::new_with_handle(new_monitor);
883 state_ptr.state.borrow_mut().display = new_display;
884 Some(0)
885}
886
887fn handle_hit_test_msg(
888 handle: HWND,
889 msg: u32,
890 wparam: WPARAM,
891 lparam: LPARAM,
892 state_ptr: Rc<WindowsWindowStatePtr>,
893) -> Option<isize> {
894 if !state_ptr.is_movable || state_ptr.state.borrow().is_fullscreen() {
895 return None;
896 }
897
898 let mut lock = state_ptr.state.borrow_mut();
899 if let Some(mut callback) = lock.callbacks.hit_test_window_control.take() {
900 drop(lock);
901 let area = callback();
902 state_ptr
903 .state
904 .borrow_mut()
905 .callbacks
906 .hit_test_window_control = Some(callback);
907 if let Some(area) = area {
908 return match area {
909 WindowControlArea::Drag => Some(HTCAPTION as _),
910 WindowControlArea::Close => Some(HTCLOSE as _),
911 WindowControlArea::Max => Some(HTMAXBUTTON as _),
912 WindowControlArea::Min => Some(HTMINBUTTON as _),
913 };
914 }
915 } else {
916 drop(lock);
917 }
918
919 if !state_ptr.hide_title_bar {
920 // If the OS draws the title bar, we don't need to handle hit test messages.
921 return None;
922 }
923
924 // default handler for resize areas
925 let hit = unsafe { DefWindowProcW(handle, msg, wparam, lparam) };
926 if matches!(
927 hit.0 as u32,
928 HTNOWHERE
929 | HTRIGHT
930 | HTLEFT
931 | HTTOPLEFT
932 | HTTOP
933 | HTTOPRIGHT
934 | HTBOTTOMRIGHT
935 | HTBOTTOM
936 | HTBOTTOMLEFT
937 ) {
938 return Some(hit.0);
939 }
940
941 if state_ptr.state.borrow().is_fullscreen() {
942 return Some(HTCLIENT as _);
943 }
944
945 let dpi = unsafe { GetDpiForWindow(handle) };
946 let frame_y = unsafe { GetSystemMetricsForDpi(SM_CYFRAME, dpi) };
947
948 let mut cursor_point = POINT {
949 x: lparam.signed_loword().into(),
950 y: lparam.signed_hiword().into(),
951 };
952 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
953 if !state_ptr.state.borrow().is_maximized() && cursor_point.y >= 0 && cursor_point.y <= frame_y
954 {
955 return Some(HTTOP as _);
956 }
957
958 Some(HTCLIENT as _)
959}
960
961fn handle_nc_mouse_move_msg(
962 handle: HWND,
963 lparam: LPARAM,
964 state_ptr: Rc<WindowsWindowStatePtr>,
965) -> Option<isize> {
966 start_tracking_mouse(handle, &state_ptr, TME_LEAVE | TME_NONCLIENT);
967
968 let mut lock = state_ptr.state.borrow_mut();
969 let mut func = lock.callbacks.input.take()?;
970 let scale_factor = lock.scale_factor;
971 drop(lock);
972
973 let mut cursor_point = POINT {
974 x: lparam.signed_loword().into(),
975 y: lparam.signed_hiword().into(),
976 };
977 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
978 let input = PlatformInput::MouseMove(MouseMoveEvent {
979 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
980 pressed_button: None,
981 modifiers: current_modifiers(),
982 });
983 let handled = !func(input).propagate;
984 state_ptr.state.borrow_mut().callbacks.input = Some(func);
985
986 if handled { Some(0) } else { None }
987}
988
989fn handle_nc_mouse_down_msg(
990 handle: HWND,
991 button: MouseButton,
992 wparam: WPARAM,
993 lparam: LPARAM,
994 state_ptr: Rc<WindowsWindowStatePtr>,
995) -> Option<isize> {
996 let mut lock = state_ptr.state.borrow_mut();
997 if let Some(mut func) = lock.callbacks.input.take() {
998 let scale_factor = lock.scale_factor;
999 let mut cursor_point = POINT {
1000 x: lparam.signed_loword().into(),
1001 y: lparam.signed_hiword().into(),
1002 };
1003 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1004 let physical_point = point(DevicePixels(cursor_point.x), DevicePixels(cursor_point.y));
1005 let click_count = lock.click_state.update(button, physical_point);
1006 drop(lock);
1007
1008 let input = PlatformInput::MouseDown(MouseDownEvent {
1009 button,
1010 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1011 modifiers: current_modifiers(),
1012 click_count,
1013 first_mouse: false,
1014 });
1015 let result = func(input.clone());
1016 let handled = !result.propagate || result.default_prevented;
1017 state_ptr.state.borrow_mut().callbacks.input = Some(func);
1018
1019 if handled {
1020 return Some(0);
1021 }
1022 } else {
1023 drop(lock);
1024 };
1025
1026 // Since these are handled in handle_nc_mouse_up_msg we must prevent the default window proc
1027 if button == MouseButton::Left {
1028 match wparam.0 as u32 {
1029 HTMINBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMINBUTTON),
1030 HTMAXBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMAXBUTTON),
1031 HTCLOSE => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTCLOSE),
1032 _ => return None,
1033 };
1034 Some(0)
1035 } else {
1036 None
1037 }
1038}
1039
1040fn handle_nc_mouse_up_msg(
1041 handle: HWND,
1042 button: MouseButton,
1043 wparam: WPARAM,
1044 lparam: LPARAM,
1045 state_ptr: Rc<WindowsWindowStatePtr>,
1046) -> Option<isize> {
1047 let mut lock = state_ptr.state.borrow_mut();
1048 if let Some(mut func) = lock.callbacks.input.take() {
1049 let scale_factor = lock.scale_factor;
1050 drop(lock);
1051
1052 let mut cursor_point = POINT {
1053 x: lparam.signed_loword().into(),
1054 y: lparam.signed_hiword().into(),
1055 };
1056 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1057 let input = PlatformInput::MouseUp(MouseUpEvent {
1058 button,
1059 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1060 modifiers: current_modifiers(),
1061 click_count: 1,
1062 });
1063 let handled = !func(input).propagate;
1064 state_ptr.state.borrow_mut().callbacks.input = Some(func);
1065
1066 if handled {
1067 return Some(0);
1068 }
1069 } else {
1070 drop(lock);
1071 }
1072
1073 let last_pressed = state_ptr.state.borrow_mut().nc_button_pressed.take();
1074 if button == MouseButton::Left
1075 && let Some(last_pressed) = last_pressed
1076 {
1077 let handled = match (wparam.0 as u32, last_pressed) {
1078 (HTMINBUTTON, HTMINBUTTON) => {
1079 unsafe { ShowWindowAsync(handle, SW_MINIMIZE).ok().log_err() };
1080 true
1081 }
1082 (HTMAXBUTTON, HTMAXBUTTON) => {
1083 if state_ptr.state.borrow().is_maximized() {
1084 unsafe { ShowWindowAsync(handle, SW_NORMAL).ok().log_err() };
1085 } else {
1086 unsafe { ShowWindowAsync(handle, SW_MAXIMIZE).ok().log_err() };
1087 }
1088 true
1089 }
1090 (HTCLOSE, HTCLOSE) => {
1091 unsafe {
1092 PostMessageW(Some(handle), WM_CLOSE, WPARAM::default(), LPARAM::default())
1093 .log_err()
1094 };
1095 true
1096 }
1097 _ => false,
1098 };
1099 if handled {
1100 return Some(0);
1101 }
1102 }
1103
1104 None
1105}
1106
1107fn handle_cursor_changed(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1108 let mut state = state_ptr.state.borrow_mut();
1109 let had_cursor = state.current_cursor.is_some();
1110
1111 state.current_cursor = if lparam.0 == 0 {
1112 None
1113 } else {
1114 Some(HCURSOR(lparam.0 as _))
1115 };
1116
1117 if had_cursor != state.current_cursor.is_some() {
1118 unsafe { SetCursor(state.current_cursor) };
1119 }
1120
1121 Some(0)
1122}
1123
1124fn handle_set_cursor(
1125 handle: HWND,
1126 lparam: LPARAM,
1127 state_ptr: Rc<WindowsWindowStatePtr>,
1128) -> Option<isize> {
1129 if unsafe { !IsWindowEnabled(handle).as_bool() }
1130 || matches!(
1131 lparam.loword() as u32,
1132 HTLEFT
1133 | HTRIGHT
1134 | HTTOP
1135 | HTTOPLEFT
1136 | HTTOPRIGHT
1137 | HTBOTTOM
1138 | HTBOTTOMLEFT
1139 | HTBOTTOMRIGHT
1140 )
1141 {
1142 return None;
1143 }
1144 unsafe {
1145 SetCursor(state_ptr.state.borrow().current_cursor);
1146 };
1147 Some(1)
1148}
1149
1150fn handle_system_settings_changed(
1151 handle: HWND,
1152 wparam: WPARAM,
1153 lparam: LPARAM,
1154 state_ptr: Rc<WindowsWindowStatePtr>,
1155) -> Option<isize> {
1156 if wparam.0 != 0 {
1157 let mut lock = state_ptr.state.borrow_mut();
1158 let display = lock.display;
1159 lock.system_settings.update(display, wparam.0);
1160 lock.click_state.system_update(wparam.0);
1161 lock.border_offset.update(handle).log_err();
1162 } else {
1163 handle_system_theme_changed(handle, lparam, state_ptr)?;
1164 };
1165 // Force to trigger WM_NCCALCSIZE event to ensure that we handle auto hide
1166 // taskbar correctly.
1167 notify_frame_changed(handle);
1168
1169 Some(0)
1170}
1171
1172fn handle_system_command(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1173 if wparam.0 == SC_KEYMENU as usize {
1174 let mut lock = state_ptr.state.borrow_mut();
1175 if lock.system_key_handled {
1176 lock.system_key_handled = false;
1177 return Some(0);
1178 }
1179 }
1180 None
1181}
1182
1183fn handle_system_theme_changed(
1184 handle: HWND,
1185 lparam: LPARAM,
1186 state_ptr: Rc<WindowsWindowStatePtr>,
1187) -> Option<isize> {
1188 // lParam is a pointer to a string that indicates the area containing the system parameter
1189 // that was changed.
1190 let parameter = PCWSTR::from_raw(lparam.0 as _);
1191 if unsafe { !parameter.is_null() && !parameter.is_empty() } {
1192 if let Some(parameter_string) = unsafe { parameter.to_string() }.log_err() {
1193 log::info!("System settings changed: {}", parameter_string);
1194 match parameter_string.as_str() {
1195 "ImmersiveColorSet" => {
1196 let new_appearance = system_appearance()
1197 .context("unable to get system appearance when handling ImmersiveColorSet")
1198 .log_err()?;
1199 let mut lock = state_ptr.state.borrow_mut();
1200 if new_appearance != lock.appearance {
1201 lock.appearance = new_appearance;
1202 let mut callback = lock.callbacks.appearance_changed.take()?;
1203 drop(lock);
1204 callback();
1205 state_ptr.state.borrow_mut().callbacks.appearance_changed = Some(callback);
1206 configure_dwm_dark_mode(handle, new_appearance);
1207 }
1208 }
1209 _ => {}
1210 }
1211 }
1212 }
1213 Some(0)
1214}
1215
1216fn handle_input_language_changed(
1217 lparam: LPARAM,
1218 state_ptr: Rc<WindowsWindowStatePtr>,
1219) -> Option<isize> {
1220 let thread = state_ptr.main_thread_id_win32;
1221 let validation = state_ptr.validation_number;
1222 unsafe {
1223 PostThreadMessageW(thread, WM_INPUTLANGCHANGE, WPARAM(validation), lparam).log_err();
1224 }
1225 Some(0)
1226}
1227
1228#[inline]
1229fn parse_char_message(wparam: WPARAM, state_ptr: &Rc<WindowsWindowStatePtr>) -> Option<String> {
1230 let code_point = wparam.loword();
1231 let mut lock = state_ptr.state.borrow_mut();
1232 // https://www.unicode.org/versions/Unicode16.0.0/core-spec/chapter-3/#G2630
1233 match code_point {
1234 0xD800..=0xDBFF => {
1235 // High surrogate, wait for low surrogate
1236 lock.pending_surrogate = Some(code_point);
1237 None
1238 }
1239 0xDC00..=0xDFFF => {
1240 if let Some(high_surrogate) = lock.pending_surrogate.take() {
1241 // Low surrogate, combine with pending high surrogate
1242 String::from_utf16(&[high_surrogate, code_point]).ok()
1243 } else {
1244 // Invalid low surrogate without a preceding high surrogate
1245 log::warn!(
1246 "Received low surrogate without a preceding high surrogate: {code_point:x}"
1247 );
1248 None
1249 }
1250 }
1251 _ => {
1252 lock.pending_surrogate = None;
1253 char::from_u32(code_point as u32)
1254 .filter(|c| !c.is_control())
1255 .map(|c| c.to_string())
1256 }
1257 }
1258}
1259
1260#[inline]
1261fn translate_message(handle: HWND, wparam: WPARAM, lparam: LPARAM) {
1262 let msg = MSG {
1263 hwnd: handle,
1264 message: WM_KEYDOWN,
1265 wParam: wparam,
1266 lParam: lparam,
1267 // It seems like leaving the following two parameters empty doesn't break key events, they still work as expected.
1268 // But if any bugs pop up after this PR, this is probably the place to look first.
1269 time: 0,
1270 pt: POINT::default(),
1271 };
1272 unsafe { TranslateMessage(&msg).ok().log_err() };
1273}
1274
1275fn handle_key_event<F>(
1276 handle: HWND,
1277 wparam: WPARAM,
1278 lparam: LPARAM,
1279 state: &mut WindowsWindowState,
1280 f: F,
1281) -> Option<PlatformInput>
1282where
1283 F: FnOnce(Keystroke) -> PlatformInput,
1284{
1285 let virtual_key = VIRTUAL_KEY(wparam.loword());
1286 let mut modifiers = current_modifiers();
1287
1288 match virtual_key {
1289 VK_SHIFT | VK_CONTROL | VK_MENU | VK_LWIN | VK_RWIN => {
1290 if state
1291 .last_reported_modifiers
1292 .is_some_and(|prev_modifiers| prev_modifiers == modifiers)
1293 {
1294 return None;
1295 }
1296 state.last_reported_modifiers = Some(modifiers);
1297 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1298 modifiers,
1299 capslock: current_capslock(),
1300 }))
1301 }
1302 VK_PACKET => {
1303 translate_message(handle, wparam, lparam);
1304 None
1305 }
1306 VK_CAPITAL => {
1307 let capslock = current_capslock();
1308 if state
1309 .last_reported_capslock
1310 .is_some_and(|prev_capslock| prev_capslock == capslock)
1311 {
1312 return None;
1313 }
1314 state.last_reported_capslock = Some(capslock);
1315 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1316 modifiers,
1317 capslock,
1318 }))
1319 }
1320 vkey => {
1321 let vkey = if vkey == VK_PROCESSKEY {
1322 VIRTUAL_KEY(unsafe { ImmGetVirtualKey(handle) } as u16)
1323 } else {
1324 vkey
1325 };
1326 let keystroke = parse_normal_key(vkey, lparam, modifiers)?;
1327 Some(f(keystroke))
1328 }
1329 }
1330}
1331
1332fn parse_immutable(vkey: VIRTUAL_KEY) -> Option<String> {
1333 Some(
1334 match vkey {
1335 VK_SPACE => "space",
1336 VK_BACK => "backspace",
1337 VK_RETURN => "enter",
1338 VK_TAB => "tab",
1339 VK_UP => "up",
1340 VK_DOWN => "down",
1341 VK_RIGHT => "right",
1342 VK_LEFT => "left",
1343 VK_HOME => "home",
1344 VK_END => "end",
1345 VK_PRIOR => "pageup",
1346 VK_NEXT => "pagedown",
1347 VK_BROWSER_BACK => "back",
1348 VK_BROWSER_FORWARD => "forward",
1349 VK_ESCAPE => "escape",
1350 VK_INSERT => "insert",
1351 VK_DELETE => "delete",
1352 VK_APPS => "menu",
1353 VK_F1 => "f1",
1354 VK_F2 => "f2",
1355 VK_F3 => "f3",
1356 VK_F4 => "f4",
1357 VK_F5 => "f5",
1358 VK_F6 => "f6",
1359 VK_F7 => "f7",
1360 VK_F8 => "f8",
1361 VK_F9 => "f9",
1362 VK_F10 => "f10",
1363 VK_F11 => "f11",
1364 VK_F12 => "f12",
1365 VK_F13 => "f13",
1366 VK_F14 => "f14",
1367 VK_F15 => "f15",
1368 VK_F16 => "f16",
1369 VK_F17 => "f17",
1370 VK_F18 => "f18",
1371 VK_F19 => "f19",
1372 VK_F20 => "f20",
1373 VK_F21 => "f21",
1374 VK_F22 => "f22",
1375 VK_F23 => "f23",
1376 VK_F24 => "f24",
1377 _ => return None,
1378 }
1379 .to_string(),
1380 )
1381}
1382
1383fn parse_normal_key(
1384 vkey: VIRTUAL_KEY,
1385 lparam: LPARAM,
1386 mut modifiers: Modifiers,
1387) -> Option<Keystroke> {
1388 let mut key_char = None;
1389 let key = parse_immutable(vkey).or_else(|| {
1390 let scan_code = lparam.hiword() & 0xFF;
1391 key_char = generate_key_char(
1392 vkey,
1393 scan_code as u32,
1394 modifiers.control,
1395 modifiers.shift,
1396 modifiers.alt,
1397 );
1398 get_keystroke_key(vkey, scan_code as u32, &mut modifiers)
1399 })?;
1400 Some(Keystroke {
1401 modifiers,
1402 key,
1403 key_char,
1404 })
1405}
1406
1407fn parse_ime_composition_string(ctx: HIMC, comp_type: IME_COMPOSITION_STRING) -> Option<String> {
1408 unsafe {
1409 let string_len = ImmGetCompositionStringW(ctx, comp_type, None, 0);
1410 if string_len >= 0 {
1411 let mut buffer = vec![0u8; string_len as usize + 2];
1412 ImmGetCompositionStringW(
1413 ctx,
1414 comp_type,
1415 Some(buffer.as_mut_ptr() as _),
1416 string_len as _,
1417 );
1418 let wstring = std::slice::from_raw_parts::<u16>(
1419 buffer.as_mut_ptr().cast::<u16>(),
1420 string_len as usize / 2,
1421 );
1422 Some(String::from_utf16_lossy(wstring))
1423 } else {
1424 None
1425 }
1426 }
1427}
1428
1429#[inline]
1430fn retrieve_composition_cursor_position(ctx: HIMC) -> usize {
1431 unsafe { ImmGetCompositionStringW(ctx, GCS_CURSORPOS, None, 0) as usize }
1432}
1433
1434#[inline]
1435fn is_virtual_key_pressed(vkey: VIRTUAL_KEY) -> bool {
1436 unsafe { GetKeyState(vkey.0 as i32) < 0 }
1437}
1438
1439#[inline]
1440pub(crate) fn current_modifiers() -> Modifiers {
1441 Modifiers {
1442 control: is_virtual_key_pressed(VK_CONTROL),
1443 alt: is_virtual_key_pressed(VK_MENU),
1444 shift: is_virtual_key_pressed(VK_SHIFT),
1445 platform: is_virtual_key_pressed(VK_LWIN) || is_virtual_key_pressed(VK_RWIN),
1446 function: false,
1447 }
1448}
1449
1450#[inline]
1451pub(crate) fn current_capslock() -> Capslock {
1452 let on = unsafe { GetKeyState(VK_CAPITAL.0 as i32) & 1 } > 0;
1453 Capslock { on: on }
1454}
1455
1456fn get_client_area_insets(
1457 handle: HWND,
1458 is_maximized: bool,
1459 windows_version: WindowsVersion,
1460) -> RECT {
1461 // For maximized windows, Windows outdents the window rect from the screen's client rect
1462 // by `frame_thickness` on each edge, meaning `insets` must contain `frame_thickness`
1463 // on all sides (including the top) to avoid the client area extending onto adjacent
1464 // monitors.
1465 //
1466 // For non-maximized windows, things become complicated:
1467 //
1468 // - On Windows 10
1469 // The top inset must be zero, since if there is any nonclient area, Windows will draw
1470 // a full native titlebar outside the client area. (This doesn't occur in the maximized
1471 // case.)
1472 //
1473 // - On Windows 11
1474 // The top inset is calculated using an empirical formula that I derived through various
1475 // tests. Without this, the top 1-2 rows of pixels in our window would be obscured.
1476 let dpi = unsafe { GetDpiForWindow(handle) };
1477 let frame_thickness = get_frame_thickness(dpi);
1478 let top_insets = if is_maximized {
1479 frame_thickness
1480 } else {
1481 match windows_version {
1482 WindowsVersion::Win10 => 0,
1483 WindowsVersion::Win11 => (dpi as f32 / USER_DEFAULT_SCREEN_DPI as f32).round() as i32,
1484 }
1485 };
1486 RECT {
1487 left: frame_thickness,
1488 top: top_insets,
1489 right: frame_thickness,
1490 bottom: frame_thickness,
1491 }
1492}
1493
1494// there is some additional non-visible space when talking about window
1495// borders on Windows:
1496// - SM_CXSIZEFRAME: The resize handle.
1497// - SM_CXPADDEDBORDER: Additional border space that isn't part of the resize handle.
1498fn get_frame_thickness(dpi: u32) -> i32 {
1499 let resize_frame_thickness = unsafe { GetSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) };
1500 let padding_thickness = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
1501 resize_frame_thickness + padding_thickness
1502}
1503
1504fn notify_frame_changed(handle: HWND) {
1505 unsafe {
1506 SetWindowPos(
1507 handle,
1508 None,
1509 0,
1510 0,
1511 0,
1512 0,
1513 SWP_FRAMECHANGED
1514 | SWP_NOACTIVATE
1515 | SWP_NOCOPYBITS
1516 | SWP_NOMOVE
1517 | SWP_NOOWNERZORDER
1518 | SWP_NOREPOSITION
1519 | SWP_NOSENDCHANGING
1520 | SWP_NOSIZE
1521 | SWP_NOZORDER,
1522 )
1523 .log_err();
1524 }
1525}
1526
1527fn start_tracking_mouse(
1528 handle: HWND,
1529 state_ptr: &Rc<WindowsWindowStatePtr>,
1530 flags: TRACKMOUSEEVENT_FLAGS,
1531) {
1532 let mut lock = state_ptr.state.borrow_mut();
1533 if !lock.hovered {
1534 lock.hovered = true;
1535 unsafe {
1536 TrackMouseEvent(&mut TRACKMOUSEEVENT {
1537 cbSize: std::mem::size_of::<TRACKMOUSEEVENT>() as u32,
1538 dwFlags: flags,
1539 hwndTrack: handle,
1540 dwHoverTime: HOVER_DEFAULT,
1541 })
1542 .log_err()
1543 };
1544 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
1545 drop(lock);
1546 callback(true);
1547 state_ptr.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
1548 }
1549 }
1550}
1551
1552fn with_input_handler<F, R>(state_ptr: &Rc<WindowsWindowStatePtr>, f: F) -> Option<R>
1553where
1554 F: FnOnce(&mut PlatformInputHandler) -> R,
1555{
1556 let mut input_handler = state_ptr.state.borrow_mut().input_handler.take()?;
1557 let result = f(&mut input_handler);
1558 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
1559 Some(result)
1560}
1561
1562fn with_input_handler_and_scale_factor<F, R>(
1563 state_ptr: &Rc<WindowsWindowStatePtr>,
1564 f: F,
1565) -> Option<R>
1566where
1567 F: FnOnce(&mut PlatformInputHandler, f32) -> Option<R>,
1568{
1569 let mut lock = state_ptr.state.borrow_mut();
1570 let mut input_handler = lock.input_handler.take()?;
1571 let scale_factor = lock.scale_factor;
1572 drop(lock);
1573 let result = f(&mut input_handler, scale_factor);
1574 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
1575 result
1576}