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