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 mut ime_input = None;
695 if lparam.0 as u32 & GCS_COMPSTR.0 > 0 {
696 let comp_string = parse_ime_composition_string(ctx)?;
697 with_input_handler(&state_ptr, |input_handler| {
698 input_handler.replace_and_mark_text_in_range(None, &comp_string, None);
699 })?;
700 ime_input = Some(comp_string);
701 }
702 if lparam.0 as u32 & GCS_CURSORPOS.0 > 0 {
703 let comp_string = &ime_input?;
704 let caret_pos = retrieve_composition_cursor_position(ctx);
705 with_input_handler(&state_ptr, |input_handler| {
706 input_handler.replace_and_mark_text_in_range(
707 None,
708 comp_string,
709 Some(caret_pos..caret_pos),
710 );
711 })?;
712 }
713 if lparam.0 as u32 & GCS_RESULTSTR.0 > 0 {
714 let comp_result = parse_ime_composition_result(ctx)?;
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 if lparam.0 == 0 {
721 // Japanese IME may send this message with lparam = 0, which indicates that
722 // there is no composition string.
723 with_input_handler(&state_ptr, |input_handler| {
724 input_handler.replace_text_in_range(None, "");
725 })?;
726 return Some(0);
727 }
728
729 // currently, we don't care other stuff
730 None
731}
732
733/// SEE: https://learn.microsoft.com/en-us/windows/win32/winmsg/wm-nccalcsize
734fn handle_calc_client_size(
735 handle: HWND,
736 wparam: WPARAM,
737 lparam: LPARAM,
738 state_ptr: Rc<WindowsWindowStatePtr>,
739) -> Option<isize> {
740 if !state_ptr.hide_title_bar || state_ptr.state.borrow().is_fullscreen() || wparam.0 == 0 {
741 return None;
742 }
743
744 let is_maximized = state_ptr.state.borrow().is_maximized();
745 let insets = get_client_area_insets(handle, is_maximized, state_ptr.windows_version);
746 // wparam is TRUE so lparam points to an NCCALCSIZE_PARAMS structure
747 let mut params = lparam.0 as *mut NCCALCSIZE_PARAMS;
748 let mut requested_client_rect = unsafe { &mut ((*params).rgrc) };
749
750 requested_client_rect[0].left += insets.left;
751 requested_client_rect[0].top += insets.top;
752 requested_client_rect[0].right -= insets.right;
753 requested_client_rect[0].bottom -= insets.bottom;
754
755 // Fix auto hide taskbar not showing. This solution is based on the approach
756 // used by Chrome. However, it may result in one row of pixels being obscured
757 // in our client area. But as Chrome says, "there seems to be no better solution."
758 if is_maximized {
759 if let Some(ref taskbar_position) = state_ptr
760 .state
761 .borrow()
762 .system_settings
763 .auto_hide_taskbar_position
764 {
765 // Fot the auto-hide taskbar, adjust in by 1 pixel on taskbar edge,
766 // so the window isn't treated as a "fullscreen app", which would cause
767 // the taskbar to disappear.
768 match taskbar_position {
769 AutoHideTaskbarPosition::Left => {
770 requested_client_rect[0].left += AUTO_HIDE_TASKBAR_THICKNESS_PX
771 }
772 AutoHideTaskbarPosition::Top => {
773 requested_client_rect[0].top += AUTO_HIDE_TASKBAR_THICKNESS_PX
774 }
775 AutoHideTaskbarPosition::Right => {
776 requested_client_rect[0].right -= AUTO_HIDE_TASKBAR_THICKNESS_PX
777 }
778 AutoHideTaskbarPosition::Bottom => {
779 requested_client_rect[0].bottom -= AUTO_HIDE_TASKBAR_THICKNESS_PX
780 }
781 }
782 }
783 }
784
785 Some(0)
786}
787
788fn handle_activate_msg(
789 handle: HWND,
790 wparam: WPARAM,
791 state_ptr: Rc<WindowsWindowStatePtr>,
792) -> Option<isize> {
793 let activated = wparam.loword() > 0;
794 if state_ptr.hide_title_bar {
795 if let Some(titlebar_rect) = state_ptr.state.borrow().get_titlebar_rect().log_err() {
796 unsafe {
797 InvalidateRect(Some(handle), Some(&titlebar_rect), false)
798 .ok()
799 .log_err()
800 };
801 }
802 }
803 let this = state_ptr.clone();
804 state_ptr
805 .executor
806 .spawn(async move {
807 let mut lock = this.state.borrow_mut();
808 if let Some(mut func) = lock.callbacks.active_status_change.take() {
809 drop(lock);
810 func(activated);
811 this.state.borrow_mut().callbacks.active_status_change = Some(func);
812 }
813 })
814 .detach();
815
816 None
817}
818
819fn handle_create_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
820 if state_ptr.hide_title_bar {
821 notify_frame_changed(handle);
822 Some(0)
823 } else {
824 None
825 }
826}
827
828fn handle_dpi_changed_msg(
829 handle: HWND,
830 wparam: WPARAM,
831 lparam: LPARAM,
832 state_ptr: Rc<WindowsWindowStatePtr>,
833) -> Option<isize> {
834 let new_dpi = wparam.loword() as f32;
835 let mut lock = state_ptr.state.borrow_mut();
836 lock.scale_factor = new_dpi / USER_DEFAULT_SCREEN_DPI as f32;
837 lock.border_offset.update(handle).log_err();
838 drop(lock);
839
840 let rect = unsafe { &*(lparam.0 as *const RECT) };
841 let width = rect.right - rect.left;
842 let height = rect.bottom - rect.top;
843 // this will emit `WM_SIZE` and `WM_MOVE` right here
844 // even before this function returns
845 // the new size is handled in `WM_SIZE`
846 unsafe {
847 SetWindowPos(
848 handle,
849 None,
850 rect.left,
851 rect.top,
852 width,
853 height,
854 SWP_NOZORDER | SWP_NOACTIVATE,
855 )
856 .context("unable to set window position after dpi has changed")
857 .log_err();
858 }
859
860 Some(0)
861}
862
863/// The following conditions will trigger this event:
864/// 1. The monitor on which the window is located goes offline or changes resolution.
865/// 2. Another monitor goes offline, is plugged in, or changes resolution.
866///
867/// In either case, the window will only receive information from the monitor on which
868/// it is located.
869///
870/// For example, in the case of condition 2, where the monitor on which the window is
871/// located has actually changed nothing, it will still receive this event.
872fn handle_display_change_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
873 // NOTE:
874 // Even the `lParam` holds the resolution of the screen, we just ignore it.
875 // Because WM_DPICHANGED, WM_MOVE, WM_SIZE will come first, window reposition and resize
876 // are handled there.
877 // So we only care about if monitor is disconnected.
878 let previous_monitor = state_ptr.state.borrow().display;
879 if WindowsDisplay::is_connected(previous_monitor.handle) {
880 // we are fine, other display changed
881 return None;
882 }
883 // display disconnected
884 // in this case, the OS will move our window to another monitor, and minimize it.
885 // we deminimize the window and query the monitor after moving
886 unsafe {
887 let _ = ShowWindow(handle, SW_SHOWNORMAL);
888 };
889 let new_monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
890 // all monitors disconnected
891 if new_monitor.is_invalid() {
892 log::error!("No monitor detected!");
893 return None;
894 }
895 let new_display = WindowsDisplay::new_with_handle(new_monitor);
896 state_ptr.state.borrow_mut().display = new_display;
897 Some(0)
898}
899
900fn handle_hit_test_msg(
901 handle: HWND,
902 msg: u32,
903 wparam: WPARAM,
904 lparam: LPARAM,
905 state_ptr: Rc<WindowsWindowStatePtr>,
906) -> Option<isize> {
907 if !state_ptr.is_movable {
908 return None;
909 }
910 if !state_ptr.hide_title_bar {
911 return None;
912 }
913
914 // default handler for resize areas
915 let hit = unsafe { DefWindowProcW(handle, msg, wparam, lparam) };
916 if matches!(
917 hit.0 as u32,
918 HTNOWHERE
919 | HTRIGHT
920 | HTLEFT
921 | HTTOPLEFT
922 | HTTOP
923 | HTTOPRIGHT
924 | HTBOTTOMRIGHT
925 | HTBOTTOM
926 | HTBOTTOMLEFT
927 ) {
928 return Some(hit.0);
929 }
930
931 if state_ptr.state.borrow().is_fullscreen() {
932 return Some(HTCLIENT as _);
933 }
934
935 let dpi = unsafe { GetDpiForWindow(handle) };
936 let frame_y = unsafe { GetSystemMetricsForDpi(SM_CYFRAME, dpi) };
937
938 let mut cursor_point = POINT {
939 x: lparam.signed_loword().into(),
940 y: lparam.signed_hiword().into(),
941 };
942 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
943 if !state_ptr.state.borrow().is_maximized() && cursor_point.y >= 0 && cursor_point.y <= frame_y
944 {
945 return Some(HTTOP as _);
946 }
947
948 let titlebar_rect = state_ptr.state.borrow().get_titlebar_rect();
949 if let Ok(titlebar_rect) = titlebar_rect {
950 if cursor_point.y < titlebar_rect.bottom {
951 let caption_btn_width = (state_ptr.state.borrow().caption_button_width().0
952 * state_ptr.state.borrow().scale_factor) as i32;
953 if cursor_point.x >= titlebar_rect.right - caption_btn_width {
954 return Some(HTCLOSE as _);
955 } else if cursor_point.x >= titlebar_rect.right - caption_btn_width * 2 {
956 return Some(HTMAXBUTTON as _);
957 } else if cursor_point.x >= titlebar_rect.right - caption_btn_width * 3 {
958 return Some(HTMINBUTTON as _);
959 }
960
961 return Some(HTCAPTION as _);
962 }
963 }
964
965 Some(HTCLIENT as _)
966}
967
968fn handle_nc_mouse_move_msg(
969 handle: HWND,
970 lparam: LPARAM,
971 state_ptr: Rc<WindowsWindowStatePtr>,
972) -> Option<isize> {
973 if !state_ptr.hide_title_bar {
974 return None;
975 }
976
977 start_tracking_mouse(handle, &state_ptr, TME_LEAVE | TME_NONCLIENT);
978
979 let mut lock = state_ptr.state.borrow_mut();
980 let mut func = lock.callbacks.input.take()?;
981 let scale_factor = lock.scale_factor;
982 drop(lock);
983
984 let mut cursor_point = POINT {
985 x: lparam.signed_loword().into(),
986 y: lparam.signed_hiword().into(),
987 };
988 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
989 let input = PlatformInput::MouseMove(MouseMoveEvent {
990 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
991 pressed_button: None,
992 modifiers: current_modifiers(),
993 });
994 let handled = !func(input).propagate;
995 state_ptr.state.borrow_mut().callbacks.input = Some(func);
996
997 if handled { Some(0) } else { None }
998}
999
1000fn handle_nc_mouse_down_msg(
1001 handle: HWND,
1002 button: MouseButton,
1003 wparam: WPARAM,
1004 lparam: LPARAM,
1005 state_ptr: Rc<WindowsWindowStatePtr>,
1006) -> Option<isize> {
1007 if !state_ptr.hide_title_bar {
1008 return None;
1009 }
1010
1011 let mut lock = state_ptr.state.borrow_mut();
1012 if let Some(mut func) = lock.callbacks.input.take() {
1013 let scale_factor = lock.scale_factor;
1014 let mut cursor_point = POINT {
1015 x: lparam.signed_loword().into(),
1016 y: lparam.signed_hiword().into(),
1017 };
1018 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1019 let physical_point = point(DevicePixels(cursor_point.x), DevicePixels(cursor_point.y));
1020 let click_count = lock.click_state.update(button, physical_point);
1021 drop(lock);
1022
1023 let input = PlatformInput::MouseDown(MouseDownEvent {
1024 button,
1025 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1026 modifiers: current_modifiers(),
1027 click_count,
1028 first_mouse: false,
1029 });
1030 let result = func(input.clone());
1031 let handled = !result.propagate || result.default_prevented;
1032 state_ptr.state.borrow_mut().callbacks.input = Some(func);
1033
1034 if handled {
1035 return Some(0);
1036 }
1037 } else {
1038 drop(lock);
1039 };
1040
1041 // Since these are handled in handle_nc_mouse_up_msg we must prevent the default window proc
1042 if button == MouseButton::Left {
1043 match wparam.0 as u32 {
1044 HTMINBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMINBUTTON),
1045 HTMAXBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMAXBUTTON),
1046 HTCLOSE => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTCLOSE),
1047 _ => return None,
1048 };
1049 Some(0)
1050 } else {
1051 None
1052 }
1053}
1054
1055fn handle_nc_mouse_up_msg(
1056 handle: HWND,
1057 button: MouseButton,
1058 wparam: WPARAM,
1059 lparam: LPARAM,
1060 state_ptr: Rc<WindowsWindowStatePtr>,
1061) -> Option<isize> {
1062 if !state_ptr.hide_title_bar {
1063 return None;
1064 }
1065
1066 let mut lock = state_ptr.state.borrow_mut();
1067 if let Some(mut func) = lock.callbacks.input.take() {
1068 let scale_factor = lock.scale_factor;
1069 drop(lock);
1070
1071 let mut cursor_point = POINT {
1072 x: lparam.signed_loword().into(),
1073 y: lparam.signed_hiword().into(),
1074 };
1075 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1076 let input = PlatformInput::MouseUp(MouseUpEvent {
1077 button,
1078 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1079 modifiers: current_modifiers(),
1080 click_count: 1,
1081 });
1082 let handled = !func(input).propagate;
1083 state_ptr.state.borrow_mut().callbacks.input = Some(func);
1084
1085 if handled {
1086 return Some(0);
1087 }
1088 } else {
1089 drop(lock);
1090 }
1091
1092 let last_pressed = state_ptr.state.borrow_mut().nc_button_pressed.take();
1093 if button == MouseButton::Left && last_pressed.is_some() {
1094 let handled = match (wparam.0 as u32, last_pressed.unwrap()) {
1095 (HTMINBUTTON, HTMINBUTTON) => {
1096 unsafe { ShowWindowAsync(handle, SW_MINIMIZE).ok().log_err() };
1097 true
1098 }
1099 (HTMAXBUTTON, HTMAXBUTTON) => {
1100 if state_ptr.state.borrow().is_maximized() {
1101 unsafe { ShowWindowAsync(handle, SW_NORMAL).ok().log_err() };
1102 } else {
1103 unsafe { ShowWindowAsync(handle, SW_MAXIMIZE).ok().log_err() };
1104 }
1105 true
1106 }
1107 (HTCLOSE, HTCLOSE) => {
1108 unsafe {
1109 PostMessageW(Some(handle), WM_CLOSE, WPARAM::default(), LPARAM::default())
1110 .log_err()
1111 };
1112 true
1113 }
1114 _ => false,
1115 };
1116 if handled {
1117 return Some(0);
1118 }
1119 }
1120
1121 None
1122}
1123
1124fn handle_cursor_changed(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1125 let mut state = state_ptr.state.borrow_mut();
1126 let had_cursor = state.current_cursor.is_some();
1127
1128 state.current_cursor = if lparam.0 == 0 {
1129 None
1130 } else {
1131 Some(HCURSOR(lparam.0 as _))
1132 };
1133
1134 if had_cursor != state.current_cursor.is_some() {
1135 unsafe { SetCursor(state.current_cursor) };
1136 }
1137
1138 Some(0)
1139}
1140
1141fn handle_set_cursor(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1142 if matches!(
1143 lparam.loword() as u32,
1144 HTLEFT | HTRIGHT | HTTOP | HTTOPLEFT | HTTOPRIGHT | HTBOTTOM | HTBOTTOMLEFT | HTBOTTOMRIGHT
1145 ) {
1146 return None;
1147 }
1148 unsafe {
1149 SetCursor(state_ptr.state.borrow().current_cursor);
1150 };
1151 Some(1)
1152}
1153
1154fn handle_system_settings_changed(
1155 handle: HWND,
1156 lparam: LPARAM,
1157 state_ptr: Rc<WindowsWindowStatePtr>,
1158) -> Option<isize> {
1159 let mut lock = state_ptr.state.borrow_mut();
1160 let display = lock.display;
1161 // system settings
1162 lock.system_settings.update(display);
1163 // mouse double click
1164 lock.click_state.system_update();
1165 // window border offset
1166 lock.border_offset.update(handle).log_err();
1167 drop(lock);
1168
1169 // lParam is a pointer to a string that indicates the area containing the system parameter
1170 // that was changed.
1171 let parameter = PCWSTR::from_raw(lparam.0 as _);
1172 if unsafe { !parameter.is_null() && !parameter.is_empty() } {
1173 if let Some(parameter_string) = unsafe { parameter.to_string() }.log_err() {
1174 log::info!("System settings changed: {}", parameter_string);
1175 match parameter_string.as_str() {
1176 "ImmersiveColorSet" => {
1177 handle_system_theme_changed(handle, state_ptr);
1178 }
1179 _ => {}
1180 }
1181 }
1182 }
1183
1184 // Force to trigger WM_NCCALCSIZE event to ensure that we handle auto hide
1185 // taskbar correctly.
1186 notify_frame_changed(handle);
1187 Some(0)
1188}
1189
1190fn handle_system_command(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1191 if wparam.0 == SC_KEYMENU as usize {
1192 let mut lock = state_ptr.state.borrow_mut();
1193 if lock.system_key_handled {
1194 lock.system_key_handled = false;
1195 return Some(0);
1196 }
1197 }
1198 None
1199}
1200
1201fn handle_system_theme_changed(
1202 handle: HWND,
1203 state_ptr: Rc<WindowsWindowStatePtr>,
1204) -> Option<isize> {
1205 let mut callback = state_ptr
1206 .state
1207 .borrow_mut()
1208 .callbacks
1209 .appearance_changed
1210 .take()?;
1211 callback();
1212 state_ptr.state.borrow_mut().callbacks.appearance_changed = Some(callback);
1213 configure_dwm_dark_mode(handle);
1214 Some(0)
1215}
1216
1217fn handle_input_language_changed(
1218 lparam: LPARAM,
1219 state_ptr: Rc<WindowsWindowStatePtr>,
1220) -> Option<isize> {
1221 let thread = state_ptr.main_thread_id_win32;
1222 let validation = state_ptr.validation_number;
1223 unsafe {
1224 PostThreadMessageW(thread, WM_INPUTLANGCHANGE, WPARAM(validation), lparam).log_err();
1225 }
1226 Some(0)
1227}
1228
1229#[inline]
1230fn translate_message(handle: HWND, wparam: WPARAM, lparam: LPARAM) {
1231 let msg = MSG {
1232 hwnd: handle,
1233 message: WM_KEYDOWN,
1234 wParam: wparam,
1235 lParam: lparam,
1236 // It seems like leaving the following two parameters empty doesn't break key events, they still work as expected.
1237 // But if any bugs pop up after this PR, this is probably the place to look first.
1238 time: 0,
1239 pt: POINT::default(),
1240 };
1241 unsafe { TranslateMessage(&msg).ok().log_err() };
1242}
1243
1244fn handle_key_event<F>(
1245 handle: HWND,
1246 wparam: WPARAM,
1247 lparam: LPARAM,
1248 state: &mut WindowsWindowState,
1249 f: F,
1250) -> Option<PlatformInput>
1251where
1252 F: FnOnce(Keystroke) -> PlatformInput,
1253{
1254 let virtual_key = VIRTUAL_KEY(wparam.loword());
1255 let mut modifiers = current_modifiers();
1256
1257 match virtual_key {
1258 VK_SHIFT | VK_CONTROL | VK_MENU | VK_LWIN | VK_RWIN => {
1259 if state
1260 .last_reported_modifiers
1261 .is_some_and(|prev_modifiers| prev_modifiers == modifiers)
1262 {
1263 return None;
1264 }
1265 state.last_reported_modifiers = Some(modifiers);
1266 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1267 modifiers,
1268 }))
1269 }
1270 vkey => {
1271 let vkey = if vkey == VK_PROCESSKEY {
1272 VIRTUAL_KEY(unsafe { ImmGetVirtualKey(handle) } as u16)
1273 } else {
1274 vkey
1275 };
1276 let keystroke = parse_normal_key(vkey, lparam, modifiers)?;
1277 Some(f(keystroke))
1278 }
1279 }
1280}
1281
1282fn parse_immutable(vkey: VIRTUAL_KEY) -> Option<String> {
1283 Some(
1284 match vkey {
1285 VK_SPACE => "space",
1286 VK_BACK => "backspace",
1287 VK_RETURN => "enter",
1288 VK_TAB => "tab",
1289 VK_UP => "up",
1290 VK_DOWN => "down",
1291 VK_RIGHT => "right",
1292 VK_LEFT => "left",
1293 VK_HOME => "home",
1294 VK_END => "end",
1295 VK_PRIOR => "pageup",
1296 VK_NEXT => "pagedown",
1297 VK_BROWSER_BACK => "back",
1298 VK_BROWSER_FORWARD => "forward",
1299 VK_ESCAPE => "escape",
1300 VK_INSERT => "insert",
1301 VK_DELETE => "delete",
1302 VK_APPS => "menu",
1303 VK_F1 => "f1",
1304 VK_F2 => "f2",
1305 VK_F3 => "f3",
1306 VK_F4 => "f4",
1307 VK_F5 => "f5",
1308 VK_F6 => "f6",
1309 VK_F7 => "f7",
1310 VK_F8 => "f8",
1311 VK_F9 => "f9",
1312 VK_F10 => "f10",
1313 VK_F11 => "f11",
1314 VK_F12 => "f12",
1315 VK_F13 => "f13",
1316 VK_F14 => "f14",
1317 VK_F15 => "f15",
1318 VK_F16 => "f16",
1319 VK_F17 => "f17",
1320 VK_F18 => "f18",
1321 VK_F19 => "f19",
1322 VK_F20 => "f20",
1323 VK_F21 => "f21",
1324 VK_F22 => "f22",
1325 VK_F23 => "f23",
1326 VK_F24 => "f24",
1327 _ => return None,
1328 }
1329 .to_string(),
1330 )
1331}
1332
1333fn parse_normal_key(
1334 vkey: VIRTUAL_KEY,
1335 lparam: LPARAM,
1336 mut modifiers: Modifiers,
1337) -> Option<Keystroke> {
1338 let mut key_char = None;
1339 let key = parse_immutable(vkey).or_else(|| {
1340 let scan_code = lparam.hiword() & 0xFF;
1341 key_char = generate_key_char(
1342 vkey,
1343 scan_code as u32,
1344 modifiers.control,
1345 modifiers.shift,
1346 modifiers.alt,
1347 );
1348 get_keystroke_key(vkey, scan_code as u32, &mut modifiers)
1349 })?;
1350 Some(Keystroke {
1351 modifiers,
1352 key,
1353 key_char,
1354 })
1355}
1356
1357fn parse_ime_composition_string(ctx: HIMC) -> Option<String> {
1358 unsafe {
1359 let string_len = ImmGetCompositionStringW(ctx, GCS_COMPSTR, None, 0);
1360 if string_len >= 0 {
1361 let mut buffer = vec![0u8; string_len as usize + 2];
1362 ImmGetCompositionStringW(
1363 ctx,
1364 GCS_COMPSTR,
1365 Some(buffer.as_mut_ptr() as _),
1366 string_len as _,
1367 );
1368 let wstring = std::slice::from_raw_parts::<u16>(
1369 buffer.as_mut_ptr().cast::<u16>(),
1370 string_len as usize / 2,
1371 );
1372 Some(String::from_utf16_lossy(wstring))
1373 } else {
1374 None
1375 }
1376 }
1377}
1378
1379#[inline]
1380fn retrieve_composition_cursor_position(ctx: HIMC) -> usize {
1381 unsafe { ImmGetCompositionStringW(ctx, GCS_CURSORPOS, None, 0) as usize }
1382}
1383
1384fn parse_ime_composition_result(ctx: HIMC) -> Option<String> {
1385 unsafe {
1386 let string_len = ImmGetCompositionStringW(ctx, GCS_RESULTSTR, None, 0);
1387 if string_len >= 0 {
1388 let mut buffer = vec![0u8; string_len as usize + 2];
1389 ImmGetCompositionStringW(
1390 ctx,
1391 GCS_RESULTSTR,
1392 Some(buffer.as_mut_ptr() as _),
1393 string_len as _,
1394 );
1395 let wstring = std::slice::from_raw_parts::<u16>(
1396 buffer.as_mut_ptr().cast::<u16>(),
1397 string_len as usize / 2,
1398 );
1399 let string = String::from_utf16_lossy(wstring);
1400 Some(string)
1401 } else {
1402 None
1403 }
1404 }
1405}
1406
1407#[inline]
1408fn is_virtual_key_pressed(vkey: VIRTUAL_KEY) -> bool {
1409 unsafe { GetKeyState(vkey.0 as i32) < 0 }
1410}
1411
1412#[inline]
1413pub(crate) fn current_modifiers() -> Modifiers {
1414 Modifiers {
1415 control: is_virtual_key_pressed(VK_CONTROL),
1416 alt: is_virtual_key_pressed(VK_MENU),
1417 shift: is_virtual_key_pressed(VK_SHIFT),
1418 platform: is_virtual_key_pressed(VK_LWIN) || is_virtual_key_pressed(VK_RWIN),
1419 function: false,
1420 }
1421}
1422
1423fn get_client_area_insets(
1424 handle: HWND,
1425 is_maximized: bool,
1426 windows_version: WindowsVersion,
1427) -> RECT {
1428 // For maximized windows, Windows outdents the window rect from the screen's client rect
1429 // by `frame_thickness` on each edge, meaning `insets` must contain `frame_thickness`
1430 // on all sides (including the top) to avoid the client area extending onto adjacent
1431 // monitors.
1432 //
1433 // For non-maximized windows, things become complicated:
1434 //
1435 // - On Windows 10
1436 // The top inset must be zero, since if there is any nonclient area, Windows will draw
1437 // a full native titlebar outside the client area. (This doesn't occur in the maximized
1438 // case.)
1439 //
1440 // - On Windows 11
1441 // The top inset is calculated using an empirical formula that I derived through various
1442 // tests. Without this, the top 1-2 rows of pixels in our window would be obscured.
1443 let dpi = unsafe { GetDpiForWindow(handle) };
1444 let frame_thickness = get_frame_thickness(dpi);
1445 let top_insets = if is_maximized {
1446 frame_thickness
1447 } else {
1448 match windows_version {
1449 WindowsVersion::Win10 => 0,
1450 WindowsVersion::Win11 => (dpi as f32 / USER_DEFAULT_SCREEN_DPI as f32).round() as i32,
1451 }
1452 };
1453 RECT {
1454 left: frame_thickness,
1455 top: top_insets,
1456 right: frame_thickness,
1457 bottom: frame_thickness,
1458 }
1459}
1460
1461// there is some additional non-visible space when talking about window
1462// borders on Windows:
1463// - SM_CXSIZEFRAME: The resize handle.
1464// - SM_CXPADDEDBORDER: Additional border space that isn't part of the resize handle.
1465fn get_frame_thickness(dpi: u32) -> i32 {
1466 let resize_frame_thickness = unsafe { GetSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) };
1467 let padding_thickness = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
1468 resize_frame_thickness + padding_thickness
1469}
1470
1471fn notify_frame_changed(handle: HWND) {
1472 unsafe {
1473 SetWindowPos(
1474 handle,
1475 None,
1476 0,
1477 0,
1478 0,
1479 0,
1480 SWP_FRAMECHANGED
1481 | SWP_NOACTIVATE
1482 | SWP_NOCOPYBITS
1483 | SWP_NOMOVE
1484 | SWP_NOOWNERZORDER
1485 | SWP_NOREPOSITION
1486 | SWP_NOSENDCHANGING
1487 | SWP_NOSIZE
1488 | SWP_NOZORDER,
1489 )
1490 .log_err();
1491 }
1492}
1493
1494fn start_tracking_mouse(
1495 handle: HWND,
1496 state_ptr: &Rc<WindowsWindowStatePtr>,
1497 flags: TRACKMOUSEEVENT_FLAGS,
1498) {
1499 let mut lock = state_ptr.state.borrow_mut();
1500 if !lock.hovered {
1501 lock.hovered = true;
1502 unsafe {
1503 TrackMouseEvent(&mut TRACKMOUSEEVENT {
1504 cbSize: std::mem::size_of::<TRACKMOUSEEVENT>() as u32,
1505 dwFlags: flags,
1506 hwndTrack: handle,
1507 dwHoverTime: HOVER_DEFAULT,
1508 })
1509 .log_err()
1510 };
1511 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
1512 drop(lock);
1513 callback(true);
1514 state_ptr.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
1515 }
1516 }
1517}
1518
1519fn with_input_handler<F, R>(state_ptr: &Rc<WindowsWindowStatePtr>, f: F) -> Option<R>
1520where
1521 F: FnOnce(&mut PlatformInputHandler) -> R,
1522{
1523 let mut input_handler = state_ptr.state.borrow_mut().input_handler.take()?;
1524 let result = f(&mut input_handler);
1525 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
1526 Some(result)
1527}
1528
1529fn with_input_handler_and_scale_factor<F, R>(
1530 state_ptr: &Rc<WindowsWindowStatePtr>,
1531 f: F,
1532) -> Option<R>
1533where
1534 F: FnOnce(&mut PlatformInputHandler, f32) -> Option<R>,
1535{
1536 let mut lock = state_ptr.state.borrow_mut();
1537 let mut input_handler = lock.input_handler.take()?;
1538 let scale_factor = lock.scale_factor;
1539 drop(lock);
1540 let result = f(&mut input_handler, scale_factor);
1541 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
1542 result
1543}