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;
26pub(crate) const WM_GPUI_FORCE_UPDATE_WINDOW: u32 = WM_USER + 5;
27
28const SIZE_MOVE_LOOP_TIMER_ID: usize = 1;
29const AUTO_HIDE_TASKBAR_THICKNESS_PX: i32 = 1;
30
31pub(crate) fn handle_msg(
32 handle: HWND,
33 msg: u32,
34 wparam: WPARAM,
35 lparam: LPARAM,
36 state_ptr: Rc<WindowsWindowStatePtr>,
37) -> LRESULT {
38 let handled = match msg {
39 WM_ACTIVATE => handle_activate_msg(wparam, state_ptr),
40 WM_CREATE => handle_create_msg(handle, state_ptr),
41 WM_DEVICECHANGE => handle_device_change_msg(handle, wparam, state_ptr),
42 WM_MOVE => handle_move_msg(handle, lparam, state_ptr),
43 WM_SIZE => handle_size_msg(wparam, lparam, state_ptr),
44 WM_GETMINMAXINFO => handle_get_min_max_info_msg(lparam, state_ptr),
45 WM_ENTERSIZEMOVE | WM_ENTERMENULOOP => handle_size_move_loop(handle),
46 WM_EXITSIZEMOVE | WM_EXITMENULOOP => handle_size_move_loop_exit(handle),
47 WM_TIMER => handle_timer_msg(handle, wparam, state_ptr),
48 WM_NCCALCSIZE => handle_calc_client_size(handle, wparam, lparam, state_ptr),
49 WM_DPICHANGED => handle_dpi_changed_msg(handle, wparam, lparam, state_ptr),
50 WM_DISPLAYCHANGE => handle_display_change_msg(handle, state_ptr),
51 WM_NCHITTEST => handle_hit_test_msg(handle, msg, wparam, lparam, state_ptr),
52 WM_PAINT => handle_paint_msg(handle, state_ptr),
53 WM_CLOSE => handle_close_msg(state_ptr),
54 WM_DESTROY => handle_destroy_msg(handle, state_ptr),
55 WM_MOUSEMOVE => handle_mouse_move_msg(handle, lparam, wparam, state_ptr),
56 WM_MOUSELEAVE | WM_NCMOUSELEAVE => handle_mouse_leave_msg(state_ptr),
57 WM_NCMOUSEMOVE => handle_nc_mouse_move_msg(handle, lparam, state_ptr),
58 WM_NCLBUTTONDOWN => {
59 handle_nc_mouse_down_msg(handle, MouseButton::Left, wparam, lparam, state_ptr)
60 }
61 WM_NCRBUTTONDOWN => {
62 handle_nc_mouse_down_msg(handle, MouseButton::Right, wparam, lparam, state_ptr)
63 }
64 WM_NCMBUTTONDOWN => {
65 handle_nc_mouse_down_msg(handle, MouseButton::Middle, wparam, lparam, state_ptr)
66 }
67 WM_NCLBUTTONUP => {
68 handle_nc_mouse_up_msg(handle, MouseButton::Left, wparam, lparam, state_ptr)
69 }
70 WM_NCRBUTTONUP => {
71 handle_nc_mouse_up_msg(handle, MouseButton::Right, wparam, lparam, state_ptr)
72 }
73 WM_NCMBUTTONUP => {
74 handle_nc_mouse_up_msg(handle, MouseButton::Middle, wparam, lparam, state_ptr)
75 }
76 WM_LBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Left, lparam, state_ptr),
77 WM_RBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Right, lparam, state_ptr),
78 WM_MBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Middle, lparam, state_ptr),
79 WM_XBUTTONDOWN => {
80 handle_xbutton_msg(handle, wparam, lparam, handle_mouse_down_msg, state_ptr)
81 }
82 WM_LBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Left, lparam, state_ptr),
83 WM_RBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Right, lparam, state_ptr),
84 WM_MBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Middle, lparam, state_ptr),
85 WM_XBUTTONUP => handle_xbutton_msg(handle, wparam, lparam, handle_mouse_up_msg, state_ptr),
86 WM_MOUSEWHEEL => handle_mouse_wheel_msg(handle, wparam, lparam, state_ptr),
87 WM_MOUSEHWHEEL => handle_mouse_horizontal_wheel_msg(handle, wparam, lparam, state_ptr),
88 WM_SYSKEYDOWN => handle_syskeydown_msg(handle, wparam, lparam, state_ptr),
89 WM_SYSKEYUP => handle_syskeyup_msg(handle, wparam, lparam, state_ptr),
90 WM_SYSCOMMAND => handle_system_command(wparam, state_ptr),
91 WM_KEYDOWN => handle_keydown_msg(handle, wparam, lparam, state_ptr),
92 WM_KEYUP => handle_keyup_msg(handle, wparam, lparam, state_ptr),
93 WM_CHAR => handle_char_msg(wparam, state_ptr),
94 WM_DEADCHAR => handle_dead_char_msg(wparam, state_ptr),
95 WM_IME_STARTCOMPOSITION => handle_ime_position(handle, state_ptr),
96 WM_IME_COMPOSITION => handle_ime_composition(handle, lparam, state_ptr),
97 WM_SETCURSOR => handle_set_cursor(handle, lparam, state_ptr),
98 WM_SETTINGCHANGE => handle_system_settings_changed(handle, wparam, lparam, state_ptr),
99 WM_INPUTLANGCHANGE => handle_input_language_changed(lparam, state_ptr),
100 WM_GPUI_CURSOR_STYLE_CHANGED => handle_cursor_changed(lparam, state_ptr),
101 WM_GPUI_FORCE_UPDATE_WINDOW => draw_window(handle, true, state_ptr),
102 _ => None,
103 };
104 if let Some(n) = handled {
105 LRESULT(n)
106 } else {
107 unsafe { DefWindowProcW(handle, msg, wparam, lparam) }
108 }
109}
110
111fn handle_move_msg(
112 handle: HWND,
113 lparam: LPARAM,
114 state_ptr: Rc<WindowsWindowStatePtr>,
115) -> Option<isize> {
116 let mut lock = state_ptr.state.borrow_mut();
117 let origin = logical_point(
118 lparam.signed_loword() as f32,
119 lparam.signed_hiword() as f32,
120 lock.scale_factor,
121 );
122 lock.origin = origin;
123 let size = lock.logical_size;
124 let center_x = origin.x.0 + size.width.0 / 2.;
125 let center_y = origin.y.0 + size.height.0 / 2.;
126 let monitor_bounds = lock.display.bounds();
127 if center_x < monitor_bounds.left().0
128 || center_x > monitor_bounds.right().0
129 || center_y < monitor_bounds.top().0
130 || center_y > monitor_bounds.bottom().0
131 {
132 // center of the window may have moved to another monitor
133 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
134 // minimize the window can trigger this event too, in this case,
135 // monitor is invalid, we do nothing.
136 if !monitor.is_invalid() && lock.display.handle != monitor {
137 // we will get the same monitor if we only have one
138 lock.display = WindowsDisplay::new_with_handle(monitor);
139 }
140 }
141 if let Some(mut callback) = lock.callbacks.moved.take() {
142 drop(lock);
143 callback();
144 state_ptr.state.borrow_mut().callbacks.moved = Some(callback);
145 }
146 Some(0)
147}
148
149fn handle_get_min_max_info_msg(
150 lparam: LPARAM,
151 state_ptr: Rc<WindowsWindowStatePtr>,
152) -> Option<isize> {
153 let lock = state_ptr.state.borrow();
154 let min_size = lock.min_size?;
155 let scale_factor = lock.scale_factor;
156 let boarder_offset = lock.border_offset;
157 drop(lock);
158 unsafe {
159 let minmax_info = &mut *(lparam.0 as *mut MINMAXINFO);
160 minmax_info.ptMinTrackSize.x =
161 min_size.width.scale(scale_factor).0 as i32 + boarder_offset.width_offset;
162 minmax_info.ptMinTrackSize.y =
163 min_size.height.scale(scale_factor).0 as i32 + boarder_offset.height_offset;
164 }
165 Some(0)
166}
167
168fn handle_size_msg(
169 wparam: WPARAM,
170 lparam: LPARAM,
171 state_ptr: Rc<WindowsWindowStatePtr>,
172) -> Option<isize> {
173 let mut lock = state_ptr.state.borrow_mut();
174
175 // Don't resize the renderer when the window is minimized, but record that it was minimized so
176 // that on restore the swap chain can be recreated via `update_drawable_size_even_if_unchanged`.
177 if wparam.0 == SIZE_MINIMIZED as usize {
178 lock.restore_from_minimized = lock.callbacks.request_frame.take();
179 return Some(0);
180 }
181
182 let width = lparam.loword().max(1) as i32;
183 let height = lparam.hiword().max(1) as i32;
184 let new_size = size(DevicePixels(width), DevicePixels(height));
185 let scale_factor = lock.scale_factor;
186 if lock.restore_from_minimized.is_some() {
187 lock.callbacks.request_frame = lock.restore_from_minimized.take();
188 } else {
189 lock.renderer.resize(new_size).log_err();
190 }
191 let new_size = new_size.to_pixels(scale_factor);
192 lock.logical_size = new_size;
193 if let Some(mut callback) = lock.callbacks.resize.take() {
194 drop(lock);
195 callback(new_size, scale_factor);
196 state_ptr.state.borrow_mut().callbacks.resize = Some(callback);
197 }
198 Some(0)
199}
200
201fn handle_size_move_loop(handle: HWND) -> Option<isize> {
202 unsafe {
203 let ret = SetTimer(
204 Some(handle),
205 SIZE_MOVE_LOOP_TIMER_ID,
206 USER_TIMER_MINIMUM,
207 None,
208 );
209 if ret == 0 {
210 log::error!(
211 "unable to create timer: {}",
212 std::io::Error::last_os_error()
213 );
214 }
215 }
216 None
217}
218
219fn handle_size_move_loop_exit(handle: HWND) -> Option<isize> {
220 unsafe {
221 KillTimer(Some(handle), SIZE_MOVE_LOOP_TIMER_ID).log_err();
222 }
223 None
224}
225
226fn handle_timer_msg(
227 handle: HWND,
228 wparam: WPARAM,
229 state_ptr: Rc<WindowsWindowStatePtr>,
230) -> Option<isize> {
231 if wparam.0 == SIZE_MOVE_LOOP_TIMER_ID {
232 for runnable in state_ptr.main_receiver.drain() {
233 runnable.run();
234 }
235 handle_paint_msg(handle, state_ptr)
236 } else {
237 None
238 }
239}
240
241fn handle_paint_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
242 draw_window(handle, false, state_ptr)
243}
244
245fn handle_close_msg(state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
246 let mut callback = state_ptr.state.borrow_mut().callbacks.should_close.take()?;
247 let should_close = callback();
248 state_ptr.state.borrow_mut().callbacks.should_close = Some(callback);
249 if should_close { None } else { Some(0) }
250}
251
252fn handle_destroy_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
253 let callback = {
254 let mut lock = state_ptr.state.borrow_mut();
255 lock.callbacks.close.take()
256 };
257 if let Some(callback) = callback {
258 callback();
259 }
260 unsafe {
261 PostThreadMessageW(
262 state_ptr.main_thread_id_win32,
263 WM_GPUI_CLOSE_ONE_WINDOW,
264 WPARAM(state_ptr.validation_number),
265 LPARAM(handle.0 as isize),
266 )
267 .log_err();
268 }
269 Some(0)
270}
271
272fn handle_mouse_move_msg(
273 handle: HWND,
274 lparam: LPARAM,
275 wparam: WPARAM,
276 state_ptr: Rc<WindowsWindowStatePtr>,
277) -> Option<isize> {
278 start_tracking_mouse(handle, &state_ptr, TME_LEAVE);
279
280 let mut lock = state_ptr.state.borrow_mut();
281 let Some(mut func) = lock.callbacks.input.take() else {
282 return Some(1);
283 };
284 let scale_factor = lock.scale_factor;
285 drop(lock);
286
287 let pressed_button = match MODIFIERKEYS_FLAGS(wparam.loword() as u32) {
288 flags if flags.contains(MK_LBUTTON) => Some(MouseButton::Left),
289 flags if flags.contains(MK_RBUTTON) => Some(MouseButton::Right),
290 flags if flags.contains(MK_MBUTTON) => Some(MouseButton::Middle),
291 flags if flags.contains(MK_XBUTTON1) => {
292 Some(MouseButton::Navigate(NavigationDirection::Back))
293 }
294 flags if flags.contains(MK_XBUTTON2) => {
295 Some(MouseButton::Navigate(NavigationDirection::Forward))
296 }
297 _ => None,
298 };
299 let x = lparam.signed_loword() as f32;
300 let y = lparam.signed_hiword() as f32;
301 let input = PlatformInput::MouseMove(MouseMoveEvent {
302 position: logical_point(x, y, scale_factor),
303 pressed_button,
304 modifiers: current_modifiers(),
305 });
306 let handled = !func(input).propagate;
307 state_ptr.state.borrow_mut().callbacks.input = Some(func);
308
309 if handled { Some(0) } else { Some(1) }
310}
311
312fn handle_mouse_leave_msg(state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
313 let mut lock = state_ptr.state.borrow_mut();
314 lock.hovered = false;
315 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
316 drop(lock);
317 callback(false);
318 state_ptr.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
319 }
320
321 Some(0)
322}
323
324fn handle_syskeydown_msg(
325 handle: HWND,
326 wparam: WPARAM,
327 lparam: LPARAM,
328 state_ptr: Rc<WindowsWindowStatePtr>,
329) -> Option<isize> {
330 let mut lock = state_ptr.state.borrow_mut();
331 let input = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
332 PlatformInput::KeyDown(KeyDownEvent {
333 keystroke,
334 is_held: lparam.0 & (0x1 << 30) > 0,
335 })
336 })?;
337 let mut func = lock.callbacks.input.take()?;
338 drop(lock);
339
340 let handled = !func(input).propagate;
341
342 let mut lock = state_ptr.state.borrow_mut();
343 lock.callbacks.input = Some(func);
344
345 if handled {
346 lock.system_key_handled = true;
347 Some(0)
348 } else {
349 // we need to call `DefWindowProcW`, or we will lose the system-wide `Alt+F4`, `Alt+{other keys}`
350 // shortcuts.
351 None
352 }
353}
354
355fn handle_syskeyup_msg(
356 handle: HWND,
357 wparam: WPARAM,
358 lparam: LPARAM,
359 state_ptr: Rc<WindowsWindowStatePtr>,
360) -> Option<isize> {
361 let mut lock = state_ptr.state.borrow_mut();
362 let input = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
363 PlatformInput::KeyUp(KeyUpEvent { keystroke })
364 })?;
365 let mut func = lock.callbacks.input.take()?;
366 drop(lock);
367 func(input);
368 state_ptr.state.borrow_mut().callbacks.input = Some(func);
369
370 // Always return 0 to indicate that the message was handled, so we could properly handle `ModifiersChanged` event.
371 Some(0)
372}
373
374// It's a known bug that you can't trigger `ctrl-shift-0`. See:
375// https://superuser.com/questions/1455762/ctrl-shift-number-key-combination-has-stopped-working-for-a-few-numbers
376fn handle_keydown_msg(
377 handle: HWND,
378 wparam: WPARAM,
379 lparam: LPARAM,
380 state_ptr: Rc<WindowsWindowStatePtr>,
381) -> Option<isize> {
382 let mut lock = state_ptr.state.borrow_mut();
383 lock.keydown_time = Some(std::time::Instant::now());
384 let Some(input) = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
385 PlatformInput::KeyDown(KeyDownEvent {
386 keystroke,
387 is_held: lparam.0 & (0x1 << 30) > 0,
388 })
389 }) else {
390 return Some(1);
391 };
392 drop(lock);
393
394 let is_composing = with_input_handler(&state_ptr, |input_handler| {
395 input_handler.marked_text_range()
396 })
397 .flatten()
398 .is_some();
399 if is_composing {
400 translate_message(handle, wparam, lparam);
401 return Some(0);
402 }
403
404 let Some(mut func) = state_ptr.state.borrow_mut().callbacks.input.take() else {
405 return Some(1);
406 };
407
408 let handled = !func(input).propagate;
409
410 state_ptr.state.borrow_mut().callbacks.input = Some(func);
411
412 if handled {
413 Some(0)
414 } else {
415 translate_message(handle, wparam, lparam);
416 Some(1)
417 }
418}
419
420fn handle_keyup_msg(
421 handle: HWND,
422 wparam: WPARAM,
423 lparam: LPARAM,
424 state_ptr: Rc<WindowsWindowStatePtr>,
425) -> Option<isize> {
426 let mut lock = state_ptr.state.borrow_mut();
427 let Some(input) = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
428 PlatformInput::KeyUp(KeyUpEvent { keystroke })
429 }) else {
430 return Some(1);
431 };
432
433 let Some(mut func) = lock.callbacks.input.take() else {
434 return Some(1);
435 };
436 drop(lock);
437
438 let handled = !func(input).propagate;
439 state_ptr.state.borrow_mut().callbacks.input = Some(func);
440
441 if handled { Some(0) } else { Some(1) }
442}
443
444fn handle_char_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
445 let input = parse_char_message(wparam, &state_ptr)?;
446 with_input_handler(&state_ptr, |input_handler| {
447 input_handler.replace_text_in_range(None, &input);
448 });
449
450 Some(0)
451}
452
453fn handle_dead_char_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
454 let ch = char::from_u32(wparam.0 as u32)?.to_string();
455 with_input_handler(&state_ptr, |input_handler| {
456 input_handler.replace_and_mark_text_in_range(None, &ch, None);
457 });
458 None
459}
460
461fn handle_mouse_down_msg(
462 handle: HWND,
463 button: MouseButton,
464 lparam: LPARAM,
465 state_ptr: Rc<WindowsWindowStatePtr>,
466) -> Option<isize> {
467 unsafe { SetCapture(handle) };
468 let mut lock = state_ptr.state.borrow_mut();
469 let Some(mut func) = lock.callbacks.input.take() else {
470 return Some(1);
471 };
472 let x = lparam.signed_loword();
473 let y = lparam.signed_hiword();
474 let physical_point = point(DevicePixels(x as i32), DevicePixels(y as i32));
475 let click_count = lock.click_state.update(button, physical_point);
476 let scale_factor = lock.scale_factor;
477 drop(lock);
478
479 let input = PlatformInput::MouseDown(MouseDownEvent {
480 button,
481 position: logical_point(x as f32, y as f32, scale_factor),
482 modifiers: current_modifiers(),
483 click_count,
484 first_mouse: false,
485 });
486 let handled = !func(input).propagate;
487 state_ptr.state.borrow_mut().callbacks.input = Some(func);
488
489 if handled { Some(0) } else { Some(1) }
490}
491
492fn handle_mouse_up_msg(
493 _handle: HWND,
494 button: MouseButton,
495 lparam: LPARAM,
496 state_ptr: Rc<WindowsWindowStatePtr>,
497) -> Option<isize> {
498 unsafe { ReleaseCapture().log_err() };
499 let mut lock = state_ptr.state.borrow_mut();
500 let Some(mut func) = lock.callbacks.input.take() else {
501 return Some(1);
502 };
503 let x = lparam.signed_loword() as f32;
504 let y = lparam.signed_hiword() as f32;
505 let click_count = lock.click_state.current_count;
506 let scale_factor = lock.scale_factor;
507 drop(lock);
508
509 let input = PlatformInput::MouseUp(MouseUpEvent {
510 button,
511 position: logical_point(x, y, scale_factor),
512 modifiers: current_modifiers(),
513 click_count,
514 });
515 let handled = !func(input).propagate;
516 state_ptr.state.borrow_mut().callbacks.input = Some(func);
517
518 if handled { Some(0) } else { Some(1) }
519}
520
521fn handle_xbutton_msg(
522 handle: HWND,
523 wparam: WPARAM,
524 lparam: LPARAM,
525 handler: impl Fn(HWND, MouseButton, LPARAM, Rc<WindowsWindowStatePtr>) -> Option<isize>,
526 state_ptr: Rc<WindowsWindowStatePtr>,
527) -> Option<isize> {
528 let nav_dir = match wparam.hiword() {
529 XBUTTON1 => NavigationDirection::Back,
530 XBUTTON2 => NavigationDirection::Forward,
531 _ => return Some(1),
532 };
533 handler(handle, MouseButton::Navigate(nav_dir), lparam, state_ptr)
534}
535
536fn handle_mouse_wheel_msg(
537 handle: HWND,
538 wparam: WPARAM,
539 lparam: LPARAM,
540 state_ptr: Rc<WindowsWindowStatePtr>,
541) -> Option<isize> {
542 let modifiers = current_modifiers();
543 let mut lock = state_ptr.state.borrow_mut();
544 let Some(mut func) = lock.callbacks.input.take() else {
545 return Some(1);
546 };
547 let scale_factor = lock.scale_factor;
548 let wheel_scroll_amount = match modifiers.shift {
549 true => lock.system_settings.mouse_wheel_settings.wheel_scroll_chars,
550 false => lock.system_settings.mouse_wheel_settings.wheel_scroll_lines,
551 };
552 drop(lock);
553
554 let wheel_distance =
555 (wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_amount as f32;
556 let mut cursor_point = POINT {
557 x: lparam.signed_loword().into(),
558 y: lparam.signed_hiword().into(),
559 };
560 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
561 let input = PlatformInput::ScrollWheel(ScrollWheelEvent {
562 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
563 delta: ScrollDelta::Lines(match modifiers.shift {
564 true => Point {
565 x: wheel_distance,
566 y: 0.0,
567 },
568 false => Point {
569 y: wheel_distance,
570 x: 0.0,
571 },
572 }),
573 modifiers,
574 touch_phase: TouchPhase::Moved,
575 });
576 let handled = !func(input).propagate;
577 state_ptr.state.borrow_mut().callbacks.input = Some(func);
578
579 if handled { Some(0) } else { Some(1) }
580}
581
582fn handle_mouse_horizontal_wheel_msg(
583 handle: HWND,
584 wparam: WPARAM,
585 lparam: LPARAM,
586 state_ptr: Rc<WindowsWindowStatePtr>,
587) -> Option<isize> {
588 let mut lock = state_ptr.state.borrow_mut();
589 let Some(mut func) = lock.callbacks.input.take() else {
590 return Some(1);
591 };
592 let scale_factor = lock.scale_factor;
593 let wheel_scroll_chars = lock.system_settings.mouse_wheel_settings.wheel_scroll_chars;
594 drop(lock);
595
596 let wheel_distance =
597 (-wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_chars as f32;
598 let mut cursor_point = POINT {
599 x: lparam.signed_loword().into(),
600 y: lparam.signed_hiword().into(),
601 };
602 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
603 let event = PlatformInput::ScrollWheel(ScrollWheelEvent {
604 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
605 delta: ScrollDelta::Lines(Point {
606 x: wheel_distance,
607 y: 0.0,
608 }),
609 modifiers: current_modifiers(),
610 touch_phase: TouchPhase::Moved,
611 });
612 let handled = !func(event).propagate;
613 state_ptr.state.borrow_mut().callbacks.input = Some(func);
614
615 if handled { Some(0) } else { Some(1) }
616}
617
618fn retrieve_caret_position(state_ptr: &Rc<WindowsWindowStatePtr>) -> Option<POINT> {
619 with_input_handler_and_scale_factor(state_ptr, |input_handler, scale_factor| {
620 let caret_range = input_handler.selected_text_range(false)?;
621 let caret_position = input_handler.bounds_for_range(caret_range.range)?;
622 Some(POINT {
623 // logical to physical
624 x: (caret_position.origin.x.0 * scale_factor) as i32,
625 y: (caret_position.origin.y.0 * scale_factor) as i32
626 + ((caret_position.size.height.0 * scale_factor) as i32 / 2),
627 })
628 })
629}
630
631fn handle_ime_position(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
632 unsafe {
633 let ctx = ImmGetContext(handle);
634
635 let Some(caret_position) = retrieve_caret_position(&state_ptr) else {
636 return Some(0);
637 };
638 {
639 let config = COMPOSITIONFORM {
640 dwStyle: CFS_POINT,
641 ptCurrentPos: caret_position,
642 ..Default::default()
643 };
644 ImmSetCompositionWindow(ctx, &config as _).ok().log_err();
645 }
646 {
647 let config = CANDIDATEFORM {
648 dwStyle: CFS_CANDIDATEPOS,
649 ptCurrentPos: caret_position,
650 ..Default::default()
651 };
652 ImmSetCandidateWindow(ctx, &config as _).ok().log_err();
653 }
654 ImmReleaseContext(handle, ctx).ok().log_err();
655 Some(0)
656 }
657}
658
659fn handle_ime_composition(
660 handle: HWND,
661 lparam: LPARAM,
662 state_ptr: Rc<WindowsWindowStatePtr>,
663) -> Option<isize> {
664 let ctx = unsafe { ImmGetContext(handle) };
665 let result = handle_ime_composition_inner(ctx, lparam, state_ptr);
666 unsafe { ImmReleaseContext(handle, ctx).ok().log_err() };
667 result
668}
669
670fn handle_ime_composition_inner(
671 ctx: HIMC,
672 lparam: LPARAM,
673 state_ptr: Rc<WindowsWindowStatePtr>,
674) -> Option<isize> {
675 let lparam = lparam.0 as u32;
676 if lparam == 0 {
677 // Japanese IME may send this message with lparam = 0, which indicates that
678 // there is no composition string.
679 with_input_handler(&state_ptr, |input_handler| {
680 input_handler.replace_text_in_range(None, "");
681 })?;
682 Some(0)
683 } else {
684 if lparam & GCS_COMPSTR.0 > 0 {
685 let comp_string = parse_ime_composition_string(ctx, GCS_COMPSTR)?;
686 let caret_pos = (!comp_string.is_empty() && lparam & GCS_CURSORPOS.0 > 0).then(|| {
687 let pos = retrieve_composition_cursor_position(ctx);
688 pos..pos
689 });
690 with_input_handler(&state_ptr, |input_handler| {
691 input_handler.replace_and_mark_text_in_range(None, &comp_string, caret_pos);
692 })?;
693 }
694 if lparam & GCS_RESULTSTR.0 > 0 {
695 let comp_result = parse_ime_composition_string(ctx, GCS_RESULTSTR)?;
696 with_input_handler(&state_ptr, |input_handler| {
697 input_handler.replace_text_in_range(None, &comp_result);
698 })?;
699 return Some(0);
700 }
701
702 // currently, we don't care other stuff
703 None
704 }
705}
706
707/// SEE: https://learn.microsoft.com/en-us/windows/win32/winmsg/wm-nccalcsize
708fn handle_calc_client_size(
709 handle: HWND,
710 wparam: WPARAM,
711 lparam: LPARAM,
712 state_ptr: Rc<WindowsWindowStatePtr>,
713) -> Option<isize> {
714 if !state_ptr.hide_title_bar || state_ptr.state.borrow().is_fullscreen() || wparam.0 == 0 {
715 return None;
716 }
717
718 let is_maximized = state_ptr.state.borrow().is_maximized();
719 let insets = get_client_area_insets(handle, is_maximized, state_ptr.windows_version);
720 // wparam is TRUE so lparam points to an NCCALCSIZE_PARAMS structure
721 let mut params = lparam.0 as *mut NCCALCSIZE_PARAMS;
722 let mut requested_client_rect = unsafe { &mut ((*params).rgrc) };
723
724 requested_client_rect[0].left += insets.left;
725 requested_client_rect[0].top += insets.top;
726 requested_client_rect[0].right -= insets.right;
727 requested_client_rect[0].bottom -= insets.bottom;
728
729 // Fix auto hide taskbar not showing. This solution is based on the approach
730 // used by Chrome. However, it may result in one row of pixels being obscured
731 // in our client area. But as Chrome says, "there seems to be no better solution."
732 if is_maximized {
733 if let Some(ref taskbar_position) = state_ptr
734 .state
735 .borrow()
736 .system_settings
737 .auto_hide_taskbar_position
738 {
739 // Fot the auto-hide taskbar, adjust in by 1 pixel on taskbar edge,
740 // so the window isn't treated as a "fullscreen app", which would cause
741 // the taskbar to disappear.
742 match taskbar_position {
743 AutoHideTaskbarPosition::Left => {
744 requested_client_rect[0].left += AUTO_HIDE_TASKBAR_THICKNESS_PX
745 }
746 AutoHideTaskbarPosition::Top => {
747 requested_client_rect[0].top += AUTO_HIDE_TASKBAR_THICKNESS_PX
748 }
749 AutoHideTaskbarPosition::Right => {
750 requested_client_rect[0].right -= AUTO_HIDE_TASKBAR_THICKNESS_PX
751 }
752 AutoHideTaskbarPosition::Bottom => {
753 requested_client_rect[0].bottom -= AUTO_HIDE_TASKBAR_THICKNESS_PX
754 }
755 }
756 }
757 }
758
759 Some(0)
760}
761
762fn handle_activate_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
763 let activated = wparam.loword() > 0;
764 let this = state_ptr.clone();
765 state_ptr
766 .executor
767 .spawn(async move {
768 let mut lock = this.state.borrow_mut();
769 if let Some(mut func) = lock.callbacks.active_status_change.take() {
770 drop(lock);
771 func(activated);
772 this.state.borrow_mut().callbacks.active_status_change = Some(func);
773 }
774 })
775 .detach();
776
777 None
778}
779
780fn handle_create_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
781 if state_ptr.hide_title_bar {
782 notify_frame_changed(handle);
783 Some(0)
784 } else {
785 None
786 }
787}
788
789fn handle_dpi_changed_msg(
790 handle: HWND,
791 wparam: WPARAM,
792 lparam: LPARAM,
793 state_ptr: Rc<WindowsWindowStatePtr>,
794) -> Option<isize> {
795 let new_dpi = wparam.loword() as f32;
796 let mut lock = state_ptr.state.borrow_mut();
797 lock.scale_factor = new_dpi / USER_DEFAULT_SCREEN_DPI as f32;
798 lock.border_offset.update(handle).log_err();
799 drop(lock);
800
801 let rect = unsafe { &*(lparam.0 as *const RECT) };
802 let width = rect.right - rect.left;
803 let height = rect.bottom - rect.top;
804 // this will emit `WM_SIZE` and `WM_MOVE` right here
805 // even before this function returns
806 // the new size is handled in `WM_SIZE`
807 unsafe {
808 SetWindowPos(
809 handle,
810 None,
811 rect.left,
812 rect.top,
813 width,
814 height,
815 SWP_NOZORDER | SWP_NOACTIVATE,
816 )
817 .context("unable to set window position after dpi has changed")
818 .log_err();
819 }
820
821 Some(0)
822}
823
824/// The following conditions will trigger this event:
825/// 1. The monitor on which the window is located goes offline or changes resolution.
826/// 2. Another monitor goes offline, is plugged in, or changes resolution.
827///
828/// In either case, the window will only receive information from the monitor on which
829/// it is located.
830///
831/// For example, in the case of condition 2, where the monitor on which the window is
832/// located has actually changed nothing, it will still receive this event.
833fn handle_display_change_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
834 // NOTE:
835 // Even the `lParam` holds the resolution of the screen, we just ignore it.
836 // Because WM_DPICHANGED, WM_MOVE, WM_SIZE will come first, window reposition and resize
837 // are handled there.
838 // So we only care about if monitor is disconnected.
839 let previous_monitor = state_ptr.state.borrow().display;
840 if WindowsDisplay::is_connected(previous_monitor.handle) {
841 // we are fine, other display changed
842 return None;
843 }
844 // display disconnected
845 // in this case, the OS will move our window to another monitor, and minimize it.
846 // we deminimize the window and query the monitor after moving
847 unsafe {
848 let _ = ShowWindow(handle, SW_SHOWNORMAL);
849 };
850 let new_monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
851 // all monitors disconnected
852 if new_monitor.is_invalid() {
853 log::error!("No monitor detected!");
854 return None;
855 }
856 let new_display = WindowsDisplay::new_with_handle(new_monitor);
857 state_ptr.state.borrow_mut().display = new_display;
858 Some(0)
859}
860
861fn handle_hit_test_msg(
862 handle: HWND,
863 msg: u32,
864 wparam: WPARAM,
865 lparam: LPARAM,
866 state_ptr: Rc<WindowsWindowStatePtr>,
867) -> Option<isize> {
868 if !state_ptr.is_movable || state_ptr.state.borrow().is_fullscreen() {
869 return None;
870 }
871
872 let mut lock = state_ptr.state.borrow_mut();
873 if let Some(mut callback) = lock.callbacks.hit_test_window_control.take() {
874 drop(lock);
875 let area = callback();
876 state_ptr
877 .state
878 .borrow_mut()
879 .callbacks
880 .hit_test_window_control = Some(callback);
881 if let Some(area) = area {
882 return match area {
883 WindowControlArea::Drag => Some(HTCAPTION as _),
884 WindowControlArea::Close => Some(HTCLOSE as _),
885 WindowControlArea::Max => Some(HTMAXBUTTON as _),
886 WindowControlArea::Min => Some(HTMINBUTTON as _),
887 };
888 }
889 } else {
890 drop(lock);
891 }
892
893 if !state_ptr.hide_title_bar {
894 // If the OS draws the title bar, we don't need to handle hit test messages.
895 return None;
896 }
897
898 // default handler for resize areas
899 let hit = unsafe { DefWindowProcW(handle, msg, wparam, lparam) };
900 if matches!(
901 hit.0 as u32,
902 HTNOWHERE
903 | HTRIGHT
904 | HTLEFT
905 | HTTOPLEFT
906 | HTTOP
907 | HTTOPRIGHT
908 | HTBOTTOMRIGHT
909 | HTBOTTOM
910 | HTBOTTOMLEFT
911 ) {
912 return Some(hit.0);
913 }
914
915 if state_ptr.state.borrow().is_fullscreen() {
916 return Some(HTCLIENT as _);
917 }
918
919 let dpi = unsafe { GetDpiForWindow(handle) };
920 let frame_y = unsafe { GetSystemMetricsForDpi(SM_CYFRAME, dpi) };
921
922 let mut cursor_point = POINT {
923 x: lparam.signed_loword().into(),
924 y: lparam.signed_hiword().into(),
925 };
926 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
927 if !state_ptr.state.borrow().is_maximized() && cursor_point.y >= 0 && cursor_point.y <= frame_y
928 {
929 return Some(HTTOP as _);
930 }
931
932 Some(HTCLIENT as _)
933}
934
935fn handle_nc_mouse_move_msg(
936 handle: HWND,
937 lparam: LPARAM,
938 state_ptr: Rc<WindowsWindowStatePtr>,
939) -> Option<isize> {
940 start_tracking_mouse(handle, &state_ptr, TME_LEAVE | TME_NONCLIENT);
941
942 let mut lock = state_ptr.state.borrow_mut();
943 let mut func = lock.callbacks.input.take()?;
944 let scale_factor = lock.scale_factor;
945 drop(lock);
946
947 let mut cursor_point = POINT {
948 x: lparam.signed_loword().into(),
949 y: lparam.signed_hiword().into(),
950 };
951 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
952 let input = PlatformInput::MouseMove(MouseMoveEvent {
953 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
954 pressed_button: None,
955 modifiers: current_modifiers(),
956 });
957 let handled = !func(input).propagate;
958 state_ptr.state.borrow_mut().callbacks.input = Some(func);
959
960 if handled { Some(0) } else { None }
961}
962
963fn handle_nc_mouse_down_msg(
964 handle: HWND,
965 button: MouseButton,
966 wparam: WPARAM,
967 lparam: LPARAM,
968 state_ptr: Rc<WindowsWindowStatePtr>,
969) -> Option<isize> {
970 let mut lock = state_ptr.state.borrow_mut();
971 if let Some(mut func) = lock.callbacks.input.take() {
972 let scale_factor = lock.scale_factor;
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 physical_point = point(DevicePixels(cursor_point.x), DevicePixels(cursor_point.y));
979 let click_count = lock.click_state.update(button, physical_point);
980 drop(lock);
981
982 let input = PlatformInput::MouseDown(MouseDownEvent {
983 button,
984 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
985 modifiers: current_modifiers(),
986 click_count,
987 first_mouse: false,
988 });
989 let result = func(input.clone());
990 let handled = !result.propagate || result.default_prevented;
991 state_ptr.state.borrow_mut().callbacks.input = Some(func);
992
993 if handled {
994 return Some(0);
995 }
996 } else {
997 drop(lock);
998 };
999
1000 // Since these are handled in handle_nc_mouse_up_msg we must prevent the default window proc
1001 if button == MouseButton::Left {
1002 match wparam.0 as u32 {
1003 HTMINBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMINBUTTON),
1004 HTMAXBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMAXBUTTON),
1005 HTCLOSE => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTCLOSE),
1006 _ => return None,
1007 };
1008 Some(0)
1009 } else {
1010 None
1011 }
1012}
1013
1014fn handle_nc_mouse_up_msg(
1015 handle: HWND,
1016 button: MouseButton,
1017 wparam: WPARAM,
1018 lparam: LPARAM,
1019 state_ptr: Rc<WindowsWindowStatePtr>,
1020) -> Option<isize> {
1021 let mut lock = state_ptr.state.borrow_mut();
1022 if let Some(mut func) = lock.callbacks.input.take() {
1023 let scale_factor = lock.scale_factor;
1024 drop(lock);
1025
1026 let mut cursor_point = POINT {
1027 x: lparam.signed_loword().into(),
1028 y: lparam.signed_hiword().into(),
1029 };
1030 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1031 let input = PlatformInput::MouseUp(MouseUpEvent {
1032 button,
1033 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1034 modifiers: current_modifiers(),
1035 click_count: 1,
1036 });
1037 let handled = !func(input).propagate;
1038 state_ptr.state.borrow_mut().callbacks.input = Some(func);
1039
1040 if handled {
1041 return Some(0);
1042 }
1043 } else {
1044 drop(lock);
1045 }
1046
1047 let last_pressed = state_ptr.state.borrow_mut().nc_button_pressed.take();
1048 if button == MouseButton::Left
1049 && let Some(last_pressed) = last_pressed
1050 {
1051 let handled = match (wparam.0 as u32, last_pressed) {
1052 (HTMINBUTTON, HTMINBUTTON) => {
1053 unsafe { ShowWindowAsync(handle, SW_MINIMIZE).ok().log_err() };
1054 true
1055 }
1056 (HTMAXBUTTON, HTMAXBUTTON) => {
1057 if state_ptr.state.borrow().is_maximized() {
1058 unsafe { ShowWindowAsync(handle, SW_NORMAL).ok().log_err() };
1059 } else {
1060 unsafe { ShowWindowAsync(handle, SW_MAXIMIZE).ok().log_err() };
1061 }
1062 true
1063 }
1064 (HTCLOSE, HTCLOSE) => {
1065 unsafe {
1066 PostMessageW(Some(handle), WM_CLOSE, WPARAM::default(), LPARAM::default())
1067 .log_err()
1068 };
1069 true
1070 }
1071 _ => false,
1072 };
1073 if handled {
1074 return Some(0);
1075 }
1076 }
1077
1078 None
1079}
1080
1081fn handle_cursor_changed(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1082 let mut state = state_ptr.state.borrow_mut();
1083 let had_cursor = state.current_cursor.is_some();
1084
1085 state.current_cursor = if lparam.0 == 0 {
1086 None
1087 } else {
1088 Some(HCURSOR(lparam.0 as _))
1089 };
1090
1091 if had_cursor != state.current_cursor.is_some() {
1092 unsafe { SetCursor(state.current_cursor) };
1093 }
1094
1095 Some(0)
1096}
1097
1098fn handle_set_cursor(
1099 handle: HWND,
1100 lparam: LPARAM,
1101 state_ptr: Rc<WindowsWindowStatePtr>,
1102) -> Option<isize> {
1103 if unsafe { !IsWindowEnabled(handle).as_bool() }
1104 || matches!(
1105 lparam.loword() as u32,
1106 HTLEFT
1107 | HTRIGHT
1108 | HTTOP
1109 | HTTOPLEFT
1110 | HTTOPRIGHT
1111 | HTBOTTOM
1112 | HTBOTTOMLEFT
1113 | HTBOTTOMRIGHT
1114 )
1115 {
1116 return None;
1117 }
1118 unsafe {
1119 SetCursor(state_ptr.state.borrow().current_cursor);
1120 };
1121 Some(1)
1122}
1123
1124fn handle_system_settings_changed(
1125 handle: HWND,
1126 wparam: WPARAM,
1127 lparam: LPARAM,
1128 state_ptr: Rc<WindowsWindowStatePtr>,
1129) -> Option<isize> {
1130 if wparam.0 != 0 {
1131 let mut lock = state_ptr.state.borrow_mut();
1132 let display = lock.display;
1133 lock.system_settings.update(display, wparam.0);
1134 lock.click_state.system_update(wparam.0);
1135 lock.border_offset.update(handle).log_err();
1136 } else {
1137 handle_system_theme_changed(handle, lparam, state_ptr)?;
1138 };
1139 // Force to trigger WM_NCCALCSIZE event to ensure that we handle auto hide
1140 // taskbar correctly.
1141 notify_frame_changed(handle);
1142
1143 Some(0)
1144}
1145
1146fn handle_system_command(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1147 if wparam.0 == SC_KEYMENU as usize {
1148 let mut lock = state_ptr.state.borrow_mut();
1149 if lock.system_key_handled {
1150 lock.system_key_handled = false;
1151 return Some(0);
1152 }
1153 }
1154 None
1155}
1156
1157fn handle_system_theme_changed(
1158 handle: HWND,
1159 lparam: LPARAM,
1160 state_ptr: Rc<WindowsWindowStatePtr>,
1161) -> Option<isize> {
1162 // lParam is a pointer to a string that indicates the area containing the system parameter
1163 // that was changed.
1164 let parameter = PCWSTR::from_raw(lparam.0 as _);
1165 if unsafe { !parameter.is_null() && !parameter.is_empty() } {
1166 if let Some(parameter_string) = unsafe { parameter.to_string() }.log_err() {
1167 log::info!("System settings changed: {}", parameter_string);
1168 match parameter_string.as_str() {
1169 "ImmersiveColorSet" => {
1170 let new_appearance = system_appearance()
1171 .context("unable to get system appearance when handling ImmersiveColorSet")
1172 .log_err()?;
1173 let mut lock = state_ptr.state.borrow_mut();
1174 if new_appearance != lock.appearance {
1175 lock.appearance = new_appearance;
1176 let mut callback = lock.callbacks.appearance_changed.take()?;
1177 drop(lock);
1178 callback();
1179 state_ptr.state.borrow_mut().callbacks.appearance_changed = Some(callback);
1180 configure_dwm_dark_mode(handle, new_appearance);
1181 }
1182 }
1183 _ => {}
1184 }
1185 }
1186 }
1187 Some(0)
1188}
1189
1190fn handle_input_language_changed(
1191 lparam: LPARAM,
1192 state_ptr: Rc<WindowsWindowStatePtr>,
1193) -> Option<isize> {
1194 let thread = state_ptr.main_thread_id_win32;
1195 let validation = state_ptr.validation_number;
1196 unsafe {
1197 PostThreadMessageW(thread, WM_INPUTLANGCHANGE, WPARAM(validation), lparam).log_err();
1198 }
1199 Some(0)
1200}
1201
1202fn handle_device_change_msg(
1203 handle: HWND,
1204 wparam: WPARAM,
1205 state_ptr: Rc<WindowsWindowStatePtr>,
1206) -> Option<isize> {
1207 if wparam.0 == DBT_DEVNODES_CHANGED as usize {
1208 // The reason for sending this message is to actually trigger a redraw of the window.
1209 unsafe {
1210 PostMessageW(
1211 Some(handle),
1212 WM_GPUI_FORCE_UPDATE_WINDOW,
1213 WPARAM(0),
1214 LPARAM(0),
1215 )
1216 .log_err();
1217 }
1218 // If the GPU device is lost, this redraw will take care of recreating the device context.
1219 // The WM_GPUI_FORCE_UPDATE_WINDOW message will take care of redrawing the window, after
1220 // the device context has been recreated.
1221 draw_window(handle, true, state_ptr)
1222 } else {
1223 // Other device change messages are not handled.
1224 None
1225 }
1226}
1227
1228#[inline]
1229fn draw_window(
1230 handle: HWND,
1231 force_render: bool,
1232 state_ptr: Rc<WindowsWindowStatePtr>,
1233) -> Option<isize> {
1234 let mut request_frame = state_ptr
1235 .state
1236 .borrow_mut()
1237 .callbacks
1238 .request_frame
1239 .take()?;
1240 request_frame(RequestFrameOptions {
1241 require_presentation: true,
1242 force_render,
1243 });
1244 let mut lock = state_ptr.state.borrow_mut();
1245 if let Some(keydown_time) = lock.keydown_time.take() {
1246 let elapsed = keydown_time.elapsed();
1247 println!("Elapsed keydown time: {:.02} ms", elapsed.as_secs_f64() * 1000.0);
1248 }
1249 lock.callbacks.request_frame = Some(request_frame);
1250 unsafe { ValidateRect(Some(handle), None).ok().log_err() };
1251 Some(0)
1252}
1253
1254#[inline]
1255fn parse_char_message(wparam: WPARAM, state_ptr: &Rc<WindowsWindowStatePtr>) -> Option<String> {
1256 let code_point = wparam.loword();
1257 let mut lock = state_ptr.state.borrow_mut();
1258 // https://www.unicode.org/versions/Unicode16.0.0/core-spec/chapter-3/#G2630
1259 match code_point {
1260 0xD800..=0xDBFF => {
1261 // High surrogate, wait for low surrogate
1262 lock.pending_surrogate = Some(code_point);
1263 None
1264 }
1265 0xDC00..=0xDFFF => {
1266 if let Some(high_surrogate) = lock.pending_surrogate.take() {
1267 // Low surrogate, combine with pending high surrogate
1268 String::from_utf16(&[high_surrogate, code_point]).ok()
1269 } else {
1270 // Invalid low surrogate without a preceding high surrogate
1271 log::warn!(
1272 "Received low surrogate without a preceding high surrogate: {code_point:x}"
1273 );
1274 None
1275 }
1276 }
1277 _ => {
1278 lock.pending_surrogate = None;
1279 char::from_u32(code_point as u32)
1280 .filter(|c| !c.is_control())
1281 .map(|c| c.to_string())
1282 }
1283 }
1284}
1285
1286#[inline]
1287fn translate_message(handle: HWND, wparam: WPARAM, lparam: LPARAM) {
1288 let msg = MSG {
1289 hwnd: handle,
1290 message: WM_KEYDOWN,
1291 wParam: wparam,
1292 lParam: lparam,
1293 // It seems like leaving the following two parameters empty doesn't break key events, they still work as expected.
1294 // But if any bugs pop up after this PR, this is probably the place to look first.
1295 time: 0,
1296 pt: POINT::default(),
1297 };
1298 unsafe { TranslateMessage(&msg).ok().log_err() };
1299}
1300
1301fn handle_key_event<F>(
1302 handle: HWND,
1303 wparam: WPARAM,
1304 lparam: LPARAM,
1305 state: &mut WindowsWindowState,
1306 f: F,
1307) -> Option<PlatformInput>
1308where
1309 F: FnOnce(Keystroke) -> PlatformInput,
1310{
1311 let virtual_key = VIRTUAL_KEY(wparam.loword());
1312 let mut modifiers = current_modifiers();
1313
1314 match virtual_key {
1315 VK_SHIFT | VK_CONTROL | VK_MENU | VK_LWIN | VK_RWIN => {
1316 if state
1317 .last_reported_modifiers
1318 .is_some_and(|prev_modifiers| prev_modifiers == modifiers)
1319 {
1320 return None;
1321 }
1322 state.last_reported_modifiers = Some(modifiers);
1323 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1324 modifiers,
1325 capslock: current_capslock(),
1326 }))
1327 }
1328 VK_PACKET => {
1329 translate_message(handle, wparam, lparam);
1330 None
1331 }
1332 VK_CAPITAL => {
1333 let capslock = current_capslock();
1334 if state
1335 .last_reported_capslock
1336 .is_some_and(|prev_capslock| prev_capslock == capslock)
1337 {
1338 return None;
1339 }
1340 state.last_reported_capslock = Some(capslock);
1341 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1342 modifiers,
1343 capslock,
1344 }))
1345 }
1346 vkey => {
1347 let vkey = if vkey == VK_PROCESSKEY {
1348 VIRTUAL_KEY(unsafe { ImmGetVirtualKey(handle) } as u16)
1349 } else {
1350 vkey
1351 };
1352 let keystroke = parse_normal_key(vkey, lparam, modifiers)?;
1353 Some(f(keystroke))
1354 }
1355 }
1356}
1357
1358fn parse_immutable(vkey: VIRTUAL_KEY) -> Option<String> {
1359 Some(
1360 match vkey {
1361 VK_SPACE => "space",
1362 VK_BACK => "backspace",
1363 VK_RETURN => "enter",
1364 VK_TAB => "tab",
1365 VK_UP => "up",
1366 VK_DOWN => "down",
1367 VK_RIGHT => "right",
1368 VK_LEFT => "left",
1369 VK_HOME => "home",
1370 VK_END => "end",
1371 VK_PRIOR => "pageup",
1372 VK_NEXT => "pagedown",
1373 VK_BROWSER_BACK => "back",
1374 VK_BROWSER_FORWARD => "forward",
1375 VK_ESCAPE => "escape",
1376 VK_INSERT => "insert",
1377 VK_DELETE => "delete",
1378 VK_APPS => "menu",
1379 VK_F1 => "f1",
1380 VK_F2 => "f2",
1381 VK_F3 => "f3",
1382 VK_F4 => "f4",
1383 VK_F5 => "f5",
1384 VK_F6 => "f6",
1385 VK_F7 => "f7",
1386 VK_F8 => "f8",
1387 VK_F9 => "f9",
1388 VK_F10 => "f10",
1389 VK_F11 => "f11",
1390 VK_F12 => "f12",
1391 VK_F13 => "f13",
1392 VK_F14 => "f14",
1393 VK_F15 => "f15",
1394 VK_F16 => "f16",
1395 VK_F17 => "f17",
1396 VK_F18 => "f18",
1397 VK_F19 => "f19",
1398 VK_F20 => "f20",
1399 VK_F21 => "f21",
1400 VK_F22 => "f22",
1401 VK_F23 => "f23",
1402 VK_F24 => "f24",
1403 _ => return None,
1404 }
1405 .to_string(),
1406 )
1407}
1408
1409fn parse_normal_key(
1410 vkey: VIRTUAL_KEY,
1411 lparam: LPARAM,
1412 mut modifiers: Modifiers,
1413) -> Option<Keystroke> {
1414 let mut key_char = None;
1415 let key = parse_immutable(vkey).or_else(|| {
1416 let scan_code = lparam.hiword() & 0xFF;
1417 key_char = generate_key_char(
1418 vkey,
1419 scan_code as u32,
1420 modifiers.control,
1421 modifiers.shift,
1422 modifiers.alt,
1423 );
1424 get_keystroke_key(vkey, scan_code as u32, &mut modifiers)
1425 })?;
1426 Some(Keystroke {
1427 modifiers,
1428 key,
1429 key_char,
1430 })
1431}
1432
1433fn parse_ime_composition_string(ctx: HIMC, comp_type: IME_COMPOSITION_STRING) -> Option<String> {
1434 unsafe {
1435 let string_len = ImmGetCompositionStringW(ctx, comp_type, None, 0);
1436 if string_len >= 0 {
1437 let mut buffer = vec![0u8; string_len as usize + 2];
1438 ImmGetCompositionStringW(
1439 ctx,
1440 comp_type,
1441 Some(buffer.as_mut_ptr() as _),
1442 string_len as _,
1443 );
1444 let wstring = std::slice::from_raw_parts::<u16>(
1445 buffer.as_mut_ptr().cast::<u16>(),
1446 string_len as usize / 2,
1447 );
1448 Some(String::from_utf16_lossy(wstring))
1449 } else {
1450 None
1451 }
1452 }
1453}
1454
1455#[inline]
1456fn retrieve_composition_cursor_position(ctx: HIMC) -> usize {
1457 unsafe { ImmGetCompositionStringW(ctx, GCS_CURSORPOS, None, 0) as usize }
1458}
1459
1460#[inline]
1461fn is_virtual_key_pressed(vkey: VIRTUAL_KEY) -> bool {
1462 unsafe { GetKeyState(vkey.0 as i32) < 0 }
1463}
1464
1465#[inline]
1466pub(crate) fn current_modifiers() -> Modifiers {
1467 Modifiers {
1468 control: is_virtual_key_pressed(VK_CONTROL),
1469 alt: is_virtual_key_pressed(VK_MENU),
1470 shift: is_virtual_key_pressed(VK_SHIFT),
1471 platform: is_virtual_key_pressed(VK_LWIN) || is_virtual_key_pressed(VK_RWIN),
1472 function: false,
1473 }
1474}
1475
1476#[inline]
1477pub(crate) fn current_capslock() -> Capslock {
1478 let on = unsafe { GetKeyState(VK_CAPITAL.0 as i32) & 1 } > 0;
1479 Capslock { on: on }
1480}
1481
1482fn get_client_area_insets(
1483 handle: HWND,
1484 is_maximized: bool,
1485 windows_version: WindowsVersion,
1486) -> RECT {
1487 // For maximized windows, Windows outdents the window rect from the screen's client rect
1488 // by `frame_thickness` on each edge, meaning `insets` must contain `frame_thickness`
1489 // on all sides (including the top) to avoid the client area extending onto adjacent
1490 // monitors.
1491 //
1492 // For non-maximized windows, things become complicated:
1493 //
1494 // - On Windows 10
1495 // The top inset must be zero, since if there is any nonclient area, Windows will draw
1496 // a full native titlebar outside the client area. (This doesn't occur in the maximized
1497 // case.)
1498 //
1499 // - On Windows 11
1500 // The top inset is calculated using an empirical formula that I derived through various
1501 // tests. Without this, the top 1-2 rows of pixels in our window would be obscured.
1502 let dpi = unsafe { GetDpiForWindow(handle) };
1503 let frame_thickness = get_frame_thickness(dpi);
1504 let top_insets = if is_maximized {
1505 frame_thickness
1506 } else {
1507 match windows_version {
1508 WindowsVersion::Win10 => 0,
1509 WindowsVersion::Win11 => (dpi as f32 / USER_DEFAULT_SCREEN_DPI as f32).round() as i32,
1510 }
1511 };
1512 RECT {
1513 left: frame_thickness,
1514 top: top_insets,
1515 right: frame_thickness,
1516 bottom: frame_thickness,
1517 }
1518}
1519
1520// there is some additional non-visible space when talking about window
1521// borders on Windows:
1522// - SM_CXSIZEFRAME: The resize handle.
1523// - SM_CXPADDEDBORDER: Additional border space that isn't part of the resize handle.
1524fn get_frame_thickness(dpi: u32) -> i32 {
1525 let resize_frame_thickness = unsafe { GetSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) };
1526 let padding_thickness = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
1527 resize_frame_thickness + padding_thickness
1528}
1529
1530fn notify_frame_changed(handle: HWND) {
1531 unsafe {
1532 SetWindowPos(
1533 handle,
1534 None,
1535 0,
1536 0,
1537 0,
1538 0,
1539 SWP_FRAMECHANGED
1540 | SWP_NOACTIVATE
1541 | SWP_NOCOPYBITS
1542 | SWP_NOMOVE
1543 | SWP_NOOWNERZORDER
1544 | SWP_NOREPOSITION
1545 | SWP_NOSENDCHANGING
1546 | SWP_NOSIZE
1547 | SWP_NOZORDER,
1548 )
1549 .log_err();
1550 }
1551}
1552
1553fn start_tracking_mouse(
1554 handle: HWND,
1555 state_ptr: &Rc<WindowsWindowStatePtr>,
1556 flags: TRACKMOUSEEVENT_FLAGS,
1557) {
1558 let mut lock = state_ptr.state.borrow_mut();
1559 if !lock.hovered {
1560 lock.hovered = true;
1561 unsafe {
1562 TrackMouseEvent(&mut TRACKMOUSEEVENT {
1563 cbSize: std::mem::size_of::<TRACKMOUSEEVENT>() as u32,
1564 dwFlags: flags,
1565 hwndTrack: handle,
1566 dwHoverTime: HOVER_DEFAULT,
1567 })
1568 .log_err()
1569 };
1570 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
1571 drop(lock);
1572 callback(true);
1573 state_ptr.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
1574 }
1575 }
1576}
1577
1578fn with_input_handler<F, R>(state_ptr: &Rc<WindowsWindowStatePtr>, f: F) -> Option<R>
1579where
1580 F: FnOnce(&mut PlatformInputHandler) -> R,
1581{
1582 let mut input_handler = state_ptr.state.borrow_mut().input_handler.take()?;
1583 let result = f(&mut input_handler);
1584 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
1585 Some(result)
1586}
1587
1588fn with_input_handler_and_scale_factor<F, R>(
1589 state_ptr: &Rc<WindowsWindowStatePtr>,
1590 f: F,
1591) -> Option<R>
1592where
1593 F: FnOnce(&mut PlatformInputHandler, f32) -> Option<R>,
1594{
1595 let mut lock = state_ptr.state.borrow_mut();
1596 let mut input_handler = lock.input_handler.take()?;
1597 let scale_factor = lock.scale_factor;
1598 drop(lock);
1599 let result = f(&mut input_handler, scale_factor);
1600 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
1601 result
1602}