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