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(wparam, lparam, state_ptr),
87 WM_SYSKEYUP => handle_syskeyup_msg(wparam, state_ptr),
88 WM_SYSCOMMAND => handle_system_command(wparam, state_ptr),
89 WM_KEYDOWN => handle_keydown_msg(wparam, lparam, state_ptr),
90 WM_KEYUP => handle_keyup_msg(wparam, state_ptr),
91 WM_CHAR => handle_char_msg(wparam, lparam, state_ptr),
92 WM_IME_STARTCOMPOSITION => handle_ime_position(handle, state_ptr),
93 WM_IME_COMPOSITION => handle_ime_composition(handle, lparam, state_ptr),
94 WM_SETCURSOR => handle_set_cursor(lparam, state_ptr),
95 WM_SETTINGCHANGE => handle_system_settings_changed(handle, lparam, state_ptr),
96 WM_GPUI_CURSOR_STYLE_CHANGED => handle_cursor_changed(lparam, state_ptr),
97 _ => None,
98 };
99 if let Some(n) = handled {
100 LRESULT(n)
101 } else {
102 unsafe { DefWindowProcW(handle, msg, wparam, lparam) }
103 }
104}
105
106fn handle_move_msg(
107 handle: HWND,
108 lparam: LPARAM,
109 state_ptr: Rc<WindowsWindowStatePtr>,
110) -> Option<isize> {
111 let mut lock = state_ptr.state.borrow_mut();
112 let origin = logical_point(
113 lparam.signed_loword() as f32,
114 lparam.signed_hiword() as f32,
115 lock.scale_factor,
116 );
117 lock.origin = origin;
118 let size = lock.logical_size;
119 let center_x = origin.x.0 + size.width.0 / 2.;
120 let center_y = origin.y.0 + size.height.0 / 2.;
121 let monitor_bounds = lock.display.bounds();
122 if center_x < monitor_bounds.left().0
123 || center_x > monitor_bounds.right().0
124 || center_y < monitor_bounds.top().0
125 || center_y > monitor_bounds.bottom().0
126 {
127 // center of the window may have moved to another monitor
128 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
129 // minimize the window can trigger this event too, in this case,
130 // monitor is invalid, we do nothing.
131 if !monitor.is_invalid() && lock.display.handle != monitor {
132 // we will get the same monitor if we only have one
133 lock.display = WindowsDisplay::new_with_handle(monitor);
134 }
135 }
136 if let Some(mut callback) = lock.callbacks.moved.take() {
137 drop(lock);
138 callback();
139 state_ptr.state.borrow_mut().callbacks.moved = Some(callback);
140 }
141 Some(0)
142}
143
144fn handle_get_min_max_info_msg(
145 lparam: LPARAM,
146 state_ptr: Rc<WindowsWindowStatePtr>,
147) -> Option<isize> {
148 let lock = state_ptr.state.borrow();
149 if let Some(min_size) = lock.min_size {
150 let scale_factor = lock.scale_factor;
151 let boarder_offset = lock.border_offset;
152 drop(lock);
153
154 unsafe {
155 let minmax_info = &mut *(lparam.0 as *mut MINMAXINFO);
156 minmax_info.ptMinTrackSize.x =
157 min_size.width.scale(scale_factor).0 as i32 + boarder_offset.width_offset;
158 minmax_info.ptMinTrackSize.y =
159 min_size.height.scale(scale_factor).0 as i32 + boarder_offset.height_offset;
160 }
161 Some(0)
162 } else {
163 None
164 }
165}
166
167fn handle_size_msg(
168 wparam: WPARAM,
169 lparam: LPARAM,
170 state_ptr: Rc<WindowsWindowStatePtr>,
171) -> Option<isize> {
172 let mut lock = state_ptr.state.borrow_mut();
173
174 // Don't resize the renderer when the window is minimized, but record that it was minimized so
175 // that on restore the swap chain can be recreated via `update_drawable_size_even_if_unchanged`.
176 if wparam.0 == SIZE_MINIMIZED as usize {
177 lock.restore_from_minimized = lock.callbacks.request_frame.take();
178 return Some(0);
179 }
180
181 let width = lparam.loword().max(1) as i32;
182 let height = lparam.hiword().max(1) as i32;
183 let new_size = size(DevicePixels(width), DevicePixels(height));
184 let scale_factor = lock.scale_factor;
185 if lock.restore_from_minimized.is_some() {
186 lock.renderer
187 .update_drawable_size_even_if_unchanged(new_size);
188 lock.callbacks.request_frame = lock.restore_from_minimized.take();
189 } else {
190 lock.renderer.update_drawable_size(new_size);
191 }
192 let new_size = new_size.to_pixels(scale_factor);
193 lock.logical_size = new_size;
194 if let Some(mut callback) = lock.callbacks.resize.take() {
195 drop(lock);
196 callback(new_size, scale_factor);
197 state_ptr.state.borrow_mut().callbacks.resize = Some(callback);
198 }
199 Some(0)
200}
201
202fn handle_size_move_loop(handle: HWND) -> Option<isize> {
203 unsafe {
204 let ret = SetTimer(
205 Some(handle),
206 SIZE_MOVE_LOOP_TIMER_ID,
207 USER_TIMER_MINIMUM,
208 None,
209 );
210 if ret == 0 {
211 log::error!(
212 "unable to create timer: {}",
213 std::io::Error::last_os_error()
214 );
215 }
216 }
217 None
218}
219
220fn handle_size_move_loop_exit(handle: HWND) -> Option<isize> {
221 unsafe {
222 KillTimer(Some(handle), SIZE_MOVE_LOOP_TIMER_ID).log_err();
223 }
224 None
225}
226
227fn handle_timer_msg(
228 handle: HWND,
229 wparam: WPARAM,
230 state_ptr: Rc<WindowsWindowStatePtr>,
231) -> Option<isize> {
232 if wparam.0 == SIZE_MOVE_LOOP_TIMER_ID {
233 for runnable in state_ptr.main_receiver.drain() {
234 runnable.run();
235 }
236 handle_paint_msg(handle, state_ptr)
237 } else {
238 None
239 }
240}
241
242fn handle_paint_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
243 let mut lock = state_ptr.state.borrow_mut();
244 if let Some(mut request_frame) = lock.callbacks.request_frame.take() {
245 drop(lock);
246 request_frame(Default::default());
247 state_ptr.state.borrow_mut().callbacks.request_frame = Some(request_frame);
248 }
249 unsafe { ValidateRect(Some(handle), None).ok().log_err() };
250 Some(0)
251}
252
253fn handle_close_msg(state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
254 let mut lock = state_ptr.state.borrow_mut();
255 if let Some(mut callback) = lock.callbacks.should_close.take() {
256 drop(lock);
257 let should_close = callback();
258 state_ptr.state.borrow_mut().callbacks.should_close = Some(callback);
259 if should_close { None } else { Some(0) }
260 } else {
261 None
262 }
263}
264
265fn handle_destroy_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
266 let callback = {
267 let mut lock = state_ptr.state.borrow_mut();
268 lock.callbacks.close.take()
269 };
270 if let Some(callback) = callback {
271 callback();
272 }
273 unsafe {
274 PostThreadMessageW(
275 state_ptr.main_thread_id_win32,
276 WM_GPUI_CLOSE_ONE_WINDOW,
277 WPARAM(state_ptr.validation_number),
278 LPARAM(handle.0 as isize),
279 )
280 .log_err();
281 }
282 Some(0)
283}
284
285fn handle_mouse_move_msg(
286 handle: HWND,
287 lparam: LPARAM,
288 wparam: WPARAM,
289 state_ptr: Rc<WindowsWindowStatePtr>,
290) -> Option<isize> {
291 start_tracking_mouse(handle, &state_ptr, TME_LEAVE);
292
293 let mut lock = state_ptr.state.borrow_mut();
294 if let Some(mut callback) = lock.callbacks.input.take() {
295 let scale_factor = lock.scale_factor;
296 drop(lock);
297 let pressed_button = match MODIFIERKEYS_FLAGS(wparam.loword() as u32) {
298 flags if flags.contains(MK_LBUTTON) => Some(MouseButton::Left),
299 flags if flags.contains(MK_RBUTTON) => Some(MouseButton::Right),
300 flags if flags.contains(MK_MBUTTON) => Some(MouseButton::Middle),
301 flags if flags.contains(MK_XBUTTON1) => {
302 Some(MouseButton::Navigate(NavigationDirection::Back))
303 }
304 flags if flags.contains(MK_XBUTTON2) => {
305 Some(MouseButton::Navigate(NavigationDirection::Forward))
306 }
307 _ => None,
308 };
309 let x = lparam.signed_loword() as f32;
310 let y = lparam.signed_hiword() as f32;
311 let event = MouseMoveEvent {
312 position: logical_point(x, y, scale_factor),
313 pressed_button,
314 modifiers: current_modifiers(),
315 };
316 let result = if callback(PlatformInput::MouseMove(event)).default_prevented {
317 Some(0)
318 } else {
319 Some(1)
320 };
321 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
322 return result;
323 }
324 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 wparam: WPARAM,
341 lparam: LPARAM,
342 state_ptr: Rc<WindowsWindowStatePtr>,
343) -> Option<isize> {
344 // we need to call `DefWindowProcW`, or we will lose the system-wide `Alt+F4`, `Alt+{other keys}`
345 // shortcuts.
346 let keystroke = parse_syskeydown_msg_keystroke(wparam)?;
347 let mut func = state_ptr.state.borrow_mut().callbacks.input.take()?;
348 let event = KeyDownEvent {
349 keystroke,
350 is_held: lparam.0 & (0x1 << 30) > 0,
351 };
352 let result = if !func(PlatformInput::KeyDown(event)).propagate {
353 state_ptr.state.borrow_mut().system_key_handled = true;
354 Some(0)
355 } else {
356 None
357 };
358 state_ptr.state.borrow_mut().callbacks.input = Some(func);
359
360 result
361}
362
363fn handle_syskeyup_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
364 // we need to call `DefWindowProcW`, or we will lose the system-wide `Alt+F4`, `Alt+{other keys}`
365 // shortcuts.
366 let keystroke = parse_syskeydown_msg_keystroke(wparam)?;
367 let mut func = state_ptr.state.borrow_mut().callbacks.input.take()?;
368 let event = KeyUpEvent { keystroke };
369 let result = if func(PlatformInput::KeyUp(event)).default_prevented {
370 Some(0)
371 } else {
372 Some(1)
373 };
374 state_ptr.state.borrow_mut().callbacks.input = Some(func);
375
376 result
377}
378
379fn handle_keydown_msg(
380 wparam: WPARAM,
381 lparam: LPARAM,
382 state_ptr: Rc<WindowsWindowStatePtr>,
383) -> Option<isize> {
384 let Some(keystroke_or_modifier) = parse_keystroke_from_vkey(wparam, false) else {
385 return Some(1);
386 };
387 let mut lock = state_ptr.state.borrow_mut();
388
389 let event = match keystroke_or_modifier {
390 KeystrokeOrModifier::Keystroke(keystroke) => PlatformInput::KeyDown(KeyDownEvent {
391 keystroke,
392 is_held: lparam.0 & (0x1 << 30) > 0,
393 }),
394 KeystrokeOrModifier::Modifier(modifiers) => {
395 if let Some(prev_modifiers) = lock.last_reported_modifiers {
396 if prev_modifiers == modifiers {
397 return Some(0);
398 }
399 }
400 lock.last_reported_modifiers = Some(modifiers);
401 PlatformInput::ModifiersChanged(ModifiersChangedEvent { modifiers })
402 }
403 };
404 let Some(mut func) = lock.callbacks.input.take() else {
405 return Some(1);
406 };
407 drop(lock);
408
409 let result = if func(event).default_prevented {
410 Some(0)
411 } else {
412 Some(1)
413 };
414 state_ptr.state.borrow_mut().callbacks.input = Some(func);
415
416 result
417}
418
419fn handle_keyup_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
420 let Some(keystroke_or_modifier) = parse_keystroke_from_vkey(wparam, true) else {
421 return Some(1);
422 };
423 let mut lock = state_ptr.state.borrow_mut();
424 let Some(mut func) = lock.callbacks.input.take() else {
425 return Some(1);
426 };
427 drop(lock);
428
429 let event = match keystroke_or_modifier {
430 KeystrokeOrModifier::Keystroke(keystroke) => PlatformInput::KeyUp(KeyUpEvent { keystroke }),
431 KeystrokeOrModifier::Modifier(modifiers) => {
432 PlatformInput::ModifiersChanged(ModifiersChangedEvent { modifiers })
433 }
434 };
435
436 let result = if func(event).default_prevented {
437 Some(0)
438 } else {
439 Some(1)
440 };
441 state_ptr.state.borrow_mut().callbacks.input = Some(func);
442
443 result
444}
445
446fn handle_char_msg(
447 wparam: WPARAM,
448 lparam: LPARAM,
449 state_ptr: Rc<WindowsWindowStatePtr>,
450) -> Option<isize> {
451 let Some(keystroke) = parse_char_msg_keystroke(wparam) else {
452 return Some(1);
453 };
454 let mut lock = state_ptr.state.borrow_mut();
455 let Some(mut func) = lock.callbacks.input.take() else {
456 return Some(1);
457 };
458 drop(lock);
459 let key_char = keystroke.key_char.clone();
460 let event = KeyDownEvent {
461 keystroke,
462 is_held: lparam.0 & (0x1 << 30) > 0,
463 };
464 let dispatch_event_result = func(PlatformInput::KeyDown(event));
465 state_ptr.state.borrow_mut().callbacks.input = Some(func);
466
467 if dispatch_event_result.default_prevented || !dispatch_event_result.propagate {
468 return Some(0);
469 }
470 let Some(ime_char) = key_char else {
471 return Some(1);
472 };
473 with_input_handler(&state_ptr, |input_handler| {
474 input_handler.replace_text_in_range(None, &ime_char);
475 });
476
477 Some(0)
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 if let Some(mut callback) = lock.callbacks.input.take() {
489 let x = lparam.signed_loword() as f32;
490 let y = lparam.signed_hiword() as f32;
491 let physical_point = point(DevicePixels(x as i32), DevicePixels(y as i32));
492 let click_count = lock.click_state.update(button, physical_point);
493 let scale_factor = lock.scale_factor;
494 drop(lock);
495
496 let event = MouseDownEvent {
497 button,
498 position: logical_point(x, y, scale_factor),
499 modifiers: current_modifiers(),
500 click_count,
501 first_mouse: false,
502 };
503 let result = if callback(PlatformInput::MouseDown(event)).default_prevented {
504 Some(0)
505 } else {
506 Some(1)
507 };
508 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
509
510 result
511 } else {
512 Some(1)
513 }
514}
515
516fn handle_mouse_up_msg(
517 _handle: HWND,
518 button: MouseButton,
519 lparam: LPARAM,
520 state_ptr: Rc<WindowsWindowStatePtr>,
521) -> Option<isize> {
522 unsafe { ReleaseCapture().log_err() };
523 let mut lock = state_ptr.state.borrow_mut();
524 if let Some(mut callback) = lock.callbacks.input.take() {
525 let x = lparam.signed_loword() as f32;
526 let y = lparam.signed_hiword() as f32;
527 let click_count = lock.click_state.current_count;
528 let scale_factor = lock.scale_factor;
529 drop(lock);
530
531 let event = MouseUpEvent {
532 button,
533 position: logical_point(x, y, scale_factor),
534 modifiers: current_modifiers(),
535 click_count,
536 };
537 let result = if callback(PlatformInput::MouseUp(event)).default_prevented {
538 Some(0)
539 } else {
540 Some(1)
541 };
542 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
543
544 result
545 } else {
546 Some(1)
547 }
548}
549
550fn handle_xbutton_msg(
551 handle: HWND,
552 wparam: WPARAM,
553 lparam: LPARAM,
554 handler: impl Fn(HWND, MouseButton, LPARAM, Rc<WindowsWindowStatePtr>) -> Option<isize>,
555 state_ptr: Rc<WindowsWindowStatePtr>,
556) -> Option<isize> {
557 let nav_dir = match wparam.hiword() {
558 XBUTTON1 => NavigationDirection::Back,
559 XBUTTON2 => NavigationDirection::Forward,
560 _ => return Some(1),
561 };
562 handler(handle, MouseButton::Navigate(nav_dir), lparam, state_ptr)
563}
564
565fn handle_mouse_wheel_msg(
566 handle: HWND,
567 wparam: WPARAM,
568 lparam: LPARAM,
569 state_ptr: Rc<WindowsWindowStatePtr>,
570) -> Option<isize> {
571 let modifiers = current_modifiers();
572 let mut lock = state_ptr.state.borrow_mut();
573 if let Some(mut callback) = lock.callbacks.input.take() {
574 let scale_factor = lock.scale_factor;
575 let wheel_scroll_amount = match modifiers.shift {
576 true => lock.system_settings.mouse_wheel_settings.wheel_scroll_chars,
577 false => lock.system_settings.mouse_wheel_settings.wheel_scroll_lines,
578 };
579 drop(lock);
580 let wheel_distance =
581 (wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_amount as f32;
582 let mut cursor_point = POINT {
583 x: lparam.signed_loword().into(),
584 y: lparam.signed_hiword().into(),
585 };
586 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
587 let event = ScrollWheelEvent {
588 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
589 delta: ScrollDelta::Lines(match modifiers.shift {
590 true => Point {
591 x: wheel_distance,
592 y: 0.0,
593 },
594 false => Point {
595 y: wheel_distance,
596 x: 0.0,
597 },
598 }),
599 modifiers: current_modifiers(),
600 touch_phase: TouchPhase::Moved,
601 };
602 let result = if callback(PlatformInput::ScrollWheel(event)).default_prevented {
603 Some(0)
604 } else {
605 Some(1)
606 };
607 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
608
609 result
610 } else {
611 Some(1)
612 }
613}
614
615fn handle_mouse_horizontal_wheel_msg(
616 handle: HWND,
617 wparam: WPARAM,
618 lparam: LPARAM,
619 state_ptr: Rc<WindowsWindowStatePtr>,
620) -> Option<isize> {
621 let mut lock = state_ptr.state.borrow_mut();
622 if let Some(mut callback) = lock.callbacks.input.take() {
623 let scale_factor = lock.scale_factor;
624 let wheel_scroll_chars = lock.system_settings.mouse_wheel_settings.wheel_scroll_chars;
625 drop(lock);
626 let wheel_distance =
627 (-wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_chars as f32;
628 let mut cursor_point = POINT {
629 x: lparam.signed_loword().into(),
630 y: lparam.signed_hiword().into(),
631 };
632 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
633 let event = ScrollWheelEvent {
634 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
635 delta: ScrollDelta::Lines(Point {
636 x: wheel_distance,
637 y: 0.0,
638 }),
639 modifiers: current_modifiers(),
640 touch_phase: TouchPhase::Moved,
641 };
642 let result = if callback(PlatformInput::ScrollWheel(event)).default_prevented {
643 Some(0)
644 } else {
645 Some(1)
646 };
647 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
648
649 result
650 } else {
651 Some(1)
652 }
653}
654
655fn retrieve_caret_position(state_ptr: &Rc<WindowsWindowStatePtr>) -> Option<POINT> {
656 with_input_handler_and_scale_factor(state_ptr, |input_handler, scale_factor| {
657 let caret_range = input_handler.selected_text_range(false)?;
658 let caret_position = input_handler.bounds_for_range(caret_range.range)?;
659 Some(POINT {
660 // logical to physical
661 x: (caret_position.origin.x.0 * scale_factor) as i32,
662 y: (caret_position.origin.y.0 * scale_factor) as i32
663 + ((caret_position.size.height.0 * scale_factor) as i32 / 2),
664 })
665 })
666}
667
668fn handle_ime_position(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
669 unsafe {
670 let ctx = ImmGetContext(handle);
671
672 let Some(caret_position) = retrieve_caret_position(&state_ptr) else {
673 return Some(0);
674 };
675 {
676 let config = COMPOSITIONFORM {
677 dwStyle: CFS_POINT,
678 ptCurrentPos: caret_position,
679 ..Default::default()
680 };
681 ImmSetCompositionWindow(ctx, &config as _).ok().log_err();
682 }
683 {
684 let config = CANDIDATEFORM {
685 dwStyle: CFS_CANDIDATEPOS,
686 ptCurrentPos: caret_position,
687 ..Default::default()
688 };
689 ImmSetCandidateWindow(ctx, &config as _).ok().log_err();
690 }
691 ImmReleaseContext(handle, ctx).ok().log_err();
692 Some(0)
693 }
694}
695
696fn handle_ime_composition(
697 handle: HWND,
698 lparam: LPARAM,
699 state_ptr: Rc<WindowsWindowStatePtr>,
700) -> Option<isize> {
701 let ctx = unsafe { ImmGetContext(handle) };
702 let result = handle_ime_composition_inner(ctx, lparam, state_ptr);
703 unsafe { ImmReleaseContext(handle, ctx).ok().log_err() };
704 result
705}
706
707fn handle_ime_composition_inner(
708 ctx: HIMC,
709 lparam: LPARAM,
710 state_ptr: Rc<WindowsWindowStatePtr>,
711) -> Option<isize> {
712 let mut ime_input = None;
713 if lparam.0 as u32 & GCS_COMPSTR.0 > 0 {
714 let (comp_string, string_len) = parse_ime_compostion_string(ctx)?;
715 with_input_handler(&state_ptr, |input_handler| {
716 input_handler.replace_and_mark_text_in_range(
717 None,
718 &comp_string,
719 Some(string_len..string_len),
720 );
721 })?;
722 ime_input = Some(comp_string);
723 }
724 if lparam.0 as u32 & GCS_CURSORPOS.0 > 0 {
725 let comp_string = &ime_input?;
726 let caret_pos = retrieve_composition_cursor_position(ctx);
727 with_input_handler(&state_ptr, |input_handler| {
728 input_handler.replace_and_mark_text_in_range(
729 None,
730 comp_string,
731 Some(caret_pos..caret_pos),
732 );
733 })?;
734 }
735 if lparam.0 as u32 & GCS_RESULTSTR.0 > 0 {
736 let comp_result = parse_ime_compostion_result(ctx)?;
737 with_input_handler(&state_ptr, |input_handler| {
738 input_handler.replace_text_in_range(None, &comp_result);
739 })?;
740 return Some(0);
741 }
742 // currently, we don't care other stuff
743 None
744}
745
746/// SEE: https://learn.microsoft.com/en-us/windows/win32/winmsg/wm-nccalcsize
747fn handle_calc_client_size(
748 handle: HWND,
749 wparam: WPARAM,
750 lparam: LPARAM,
751 state_ptr: Rc<WindowsWindowStatePtr>,
752) -> Option<isize> {
753 if !state_ptr.hide_title_bar || state_ptr.state.borrow().is_fullscreen() || wparam.0 == 0 {
754 return None;
755 }
756
757 let is_maximized = state_ptr.state.borrow().is_maximized();
758 let insets = get_client_area_insets(handle, is_maximized, state_ptr.windows_version);
759 // wparam is TRUE so lparam points to an NCCALCSIZE_PARAMS structure
760 let mut params = lparam.0 as *mut NCCALCSIZE_PARAMS;
761 let mut requested_client_rect = unsafe { &mut ((*params).rgrc) };
762
763 requested_client_rect[0].left += insets.left;
764 requested_client_rect[0].top += insets.top;
765 requested_client_rect[0].right -= insets.right;
766 requested_client_rect[0].bottom -= insets.bottom;
767
768 // Fix auto hide taskbar not showing. This solution is based on the approach
769 // used by Chrome. However, it may result in one row of pixels being obscured
770 // in our client area. But as Chrome says, "there seems to be no better solution."
771 if is_maximized {
772 if let Some(ref taskbar_position) = state_ptr
773 .state
774 .borrow()
775 .system_settings
776 .auto_hide_taskbar_position
777 {
778 // Fot the auto-hide taskbar, adjust in by 1 pixel on taskbar edge,
779 // so the window isn't treated as a "fullscreen app", which would cause
780 // the taskbar to disappear.
781 match taskbar_position {
782 AutoHideTaskbarPosition::Left => {
783 requested_client_rect[0].left += AUTO_HIDE_TASKBAR_THICKNESS_PX
784 }
785 AutoHideTaskbarPosition::Top => {
786 requested_client_rect[0].top += AUTO_HIDE_TASKBAR_THICKNESS_PX
787 }
788 AutoHideTaskbarPosition::Right => {
789 requested_client_rect[0].right -= AUTO_HIDE_TASKBAR_THICKNESS_PX
790 }
791 AutoHideTaskbarPosition::Bottom => {
792 requested_client_rect[0].bottom -= AUTO_HIDE_TASKBAR_THICKNESS_PX
793 }
794 }
795 }
796 }
797
798 Some(0)
799}
800
801fn handle_activate_msg(
802 handle: HWND,
803 wparam: WPARAM,
804 state_ptr: Rc<WindowsWindowStatePtr>,
805) -> Option<isize> {
806 let activated = wparam.loword() > 0;
807 if state_ptr.hide_title_bar {
808 if let Some(titlebar_rect) = state_ptr.state.borrow().get_titlebar_rect().log_err() {
809 unsafe {
810 InvalidateRect(Some(handle), Some(&titlebar_rect), false)
811 .ok()
812 .log_err()
813 };
814 }
815 }
816 let this = state_ptr.clone();
817 state_ptr
818 .executor
819 .spawn(async move {
820 let mut lock = this.state.borrow_mut();
821 if let Some(mut cb) = lock.callbacks.active_status_change.take() {
822 drop(lock);
823 cb(activated);
824 this.state.borrow_mut().callbacks.active_status_change = Some(cb);
825 }
826 })
827 .detach();
828
829 None
830}
831
832fn handle_create_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
833 if state_ptr.hide_title_bar {
834 notify_frame_changed(handle);
835 Some(0)
836 } else {
837 None
838 }
839}
840
841fn handle_dpi_changed_msg(
842 handle: HWND,
843 wparam: WPARAM,
844 lparam: LPARAM,
845 state_ptr: Rc<WindowsWindowStatePtr>,
846) -> Option<isize> {
847 let new_dpi = wparam.loword() as f32;
848 let mut lock = state_ptr.state.borrow_mut();
849 lock.scale_factor = new_dpi / USER_DEFAULT_SCREEN_DPI as f32;
850 lock.border_offset.update(handle).log_err();
851 drop(lock);
852
853 let rect = unsafe { &*(lparam.0 as *const RECT) };
854 let width = rect.right - rect.left;
855 let height = rect.bottom - rect.top;
856 // this will emit `WM_SIZE` and `WM_MOVE` right here
857 // even before this function returns
858 // the new size is handled in `WM_SIZE`
859 unsafe {
860 SetWindowPos(
861 handle,
862 None,
863 rect.left,
864 rect.top,
865 width,
866 height,
867 SWP_NOZORDER | SWP_NOACTIVATE,
868 )
869 .context("unable to set window position after dpi has changed")
870 .log_err();
871 }
872
873 Some(0)
874}
875
876/// The following conditions will trigger this event:
877/// 1. The monitor on which the window is located goes offline or changes resolution.
878/// 2. Another monitor goes offline, is plugged in, or changes resolution.
879///
880/// In either case, the window will only receive information from the monitor on which
881/// it is located.
882///
883/// For example, in the case of condition 2, where the monitor on which the window is
884/// located has actually changed nothing, it will still receive this event.
885fn handle_display_change_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
886 // NOTE:
887 // Even the `lParam` holds the resolution of the screen, we just ignore it.
888 // Because WM_DPICHANGED, WM_MOVE, WM_SIZE will come first, window reposition and resize
889 // are handled there.
890 // So we only care about if monitor is disconnected.
891 let previous_monitor = state_ptr.as_ref().state.borrow().display;
892 if WindowsDisplay::is_connected(previous_monitor.handle) {
893 // we are fine, other display changed
894 return None;
895 }
896 // display disconnected
897 // in this case, the OS will move our window to another monitor, and minimize it.
898 // we deminimize the window and query the monitor after moving
899 unsafe {
900 let _ = ShowWindow(handle, SW_SHOWNORMAL);
901 };
902 let new_monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
903 // all monitors disconnected
904 if new_monitor.is_invalid() {
905 log::error!("No monitor detected!");
906 return None;
907 }
908 let new_display = WindowsDisplay::new_with_handle(new_monitor);
909 state_ptr.as_ref().state.borrow_mut().display = new_display;
910 Some(0)
911}
912
913fn handle_hit_test_msg(
914 handle: HWND,
915 msg: u32,
916 wparam: WPARAM,
917 lparam: LPARAM,
918 state_ptr: Rc<WindowsWindowStatePtr>,
919) -> Option<isize> {
920 if !state_ptr.is_movable {
921 return None;
922 }
923 if !state_ptr.hide_title_bar {
924 return None;
925 }
926
927 // default handler for resize areas
928 let hit = unsafe { DefWindowProcW(handle, msg, wparam, lparam) };
929 if matches!(
930 hit.0 as u32,
931 HTNOWHERE
932 | HTRIGHT
933 | HTLEFT
934 | HTTOPLEFT
935 | HTTOP
936 | HTTOPRIGHT
937 | HTBOTTOMRIGHT
938 | HTBOTTOM
939 | HTBOTTOMLEFT
940 ) {
941 return Some(hit.0);
942 }
943
944 if state_ptr.state.borrow().is_fullscreen() {
945 return Some(HTCLIENT as _);
946 }
947
948 let dpi = unsafe { GetDpiForWindow(handle) };
949 let frame_y = unsafe { GetSystemMetricsForDpi(SM_CYFRAME, dpi) };
950
951 let mut cursor_point = POINT {
952 x: lparam.signed_loword().into(),
953 y: lparam.signed_hiword().into(),
954 };
955 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
956 if !state_ptr.state.borrow().is_maximized() && cursor_point.y >= 0 && cursor_point.y <= frame_y
957 {
958 return Some(HTTOP as _);
959 }
960
961 let titlebar_rect = state_ptr.state.borrow().get_titlebar_rect();
962 if let Ok(titlebar_rect) = titlebar_rect {
963 if cursor_point.y < titlebar_rect.bottom {
964 let caption_btn_width = (state_ptr.state.borrow().caption_button_width().0
965 * state_ptr.state.borrow().scale_factor) as i32;
966 if cursor_point.x >= titlebar_rect.right - caption_btn_width {
967 return Some(HTCLOSE as _);
968 } else if cursor_point.x >= titlebar_rect.right - caption_btn_width * 2 {
969 return Some(HTMAXBUTTON as _);
970 } else if cursor_point.x >= titlebar_rect.right - caption_btn_width * 3 {
971 return Some(HTMINBUTTON as _);
972 }
973
974 return Some(HTCAPTION as _);
975 }
976 }
977
978 Some(HTCLIENT as _)
979}
980
981fn handle_nc_mouse_move_msg(
982 handle: HWND,
983 lparam: LPARAM,
984 state_ptr: Rc<WindowsWindowStatePtr>,
985) -> Option<isize> {
986 if !state_ptr.hide_title_bar {
987 return None;
988 }
989
990 start_tracking_mouse(handle, &state_ptr, TME_LEAVE | TME_NONCLIENT);
991
992 let mut lock = state_ptr.state.borrow_mut();
993 if let Some(mut callback) = lock.callbacks.input.take() {
994 let scale_factor = lock.scale_factor;
995 drop(lock);
996 let mut cursor_point = POINT {
997 x: lparam.signed_loword().into(),
998 y: lparam.signed_hiword().into(),
999 };
1000 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1001 let event = MouseMoveEvent {
1002 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1003 pressed_button: None,
1004 modifiers: current_modifiers(),
1005 };
1006 let result = if callback(PlatformInput::MouseMove(event)).default_prevented {
1007 Some(0)
1008 } else {
1009 Some(1)
1010 };
1011 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
1012
1013 result
1014 } else {
1015 None
1016 }
1017}
1018
1019fn handle_nc_mouse_down_msg(
1020 handle: HWND,
1021 button: MouseButton,
1022 wparam: WPARAM,
1023 lparam: LPARAM,
1024 state_ptr: Rc<WindowsWindowStatePtr>,
1025) -> Option<isize> {
1026 if !state_ptr.hide_title_bar {
1027 return None;
1028 }
1029
1030 let mut lock = state_ptr.state.borrow_mut();
1031 if let Some(mut callback) = lock.callbacks.input.take() {
1032 let scale_factor = lock.scale_factor;
1033 let mut cursor_point = POINT {
1034 x: lparam.signed_loword().into(),
1035 y: lparam.signed_hiword().into(),
1036 };
1037 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1038 let physical_point = point(DevicePixels(cursor_point.x), DevicePixels(cursor_point.y));
1039 let click_count = lock.click_state.update(button, physical_point);
1040 drop(lock);
1041 let event = MouseDownEvent {
1042 button,
1043 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1044 modifiers: current_modifiers(),
1045 click_count,
1046 first_mouse: false,
1047 };
1048 let result = if callback(PlatformInput::MouseDown(event)).default_prevented {
1049 Some(0)
1050 } else {
1051 None
1052 };
1053 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
1054
1055 if result.is_some() {
1056 return result;
1057 }
1058 } else {
1059 drop(lock);
1060 };
1061
1062 // Since these are handled in handle_nc_mouse_up_msg we must prevent the default window proc
1063 if button == MouseButton::Left {
1064 match wparam.0 as u32 {
1065 HTMINBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMINBUTTON),
1066 HTMAXBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMAXBUTTON),
1067 HTCLOSE => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTCLOSE),
1068 _ => return None,
1069 };
1070 Some(0)
1071 } else {
1072 None
1073 }
1074}
1075
1076fn handle_nc_mouse_up_msg(
1077 handle: HWND,
1078 button: MouseButton,
1079 wparam: WPARAM,
1080 lparam: LPARAM,
1081 state_ptr: Rc<WindowsWindowStatePtr>,
1082) -> Option<isize> {
1083 if !state_ptr.hide_title_bar {
1084 return None;
1085 }
1086
1087 let mut lock = state_ptr.state.borrow_mut();
1088 if let Some(mut callback) = lock.callbacks.input.take() {
1089 let scale_factor = lock.scale_factor;
1090 drop(lock);
1091 let mut cursor_point = POINT {
1092 x: lparam.signed_loword().into(),
1093 y: lparam.signed_hiword().into(),
1094 };
1095 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1096 let event = MouseUpEvent {
1097 button,
1098 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1099 modifiers: current_modifiers(),
1100 click_count: 1,
1101 };
1102 let result = if callback(PlatformInput::MouseUp(event)).default_prevented {
1103 Some(0)
1104 } else {
1105 None
1106 };
1107 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
1108 if result.is_some() {
1109 return result;
1110 }
1111 } else {
1112 drop(lock);
1113 }
1114
1115 let last_pressed = state_ptr.state.borrow_mut().nc_button_pressed.take();
1116 if button == MouseButton::Left && last_pressed.is_some() {
1117 let last_button = last_pressed.unwrap();
1118 let mut handled = false;
1119 match wparam.0 as u32 {
1120 HTMINBUTTON => {
1121 if last_button == HTMINBUTTON {
1122 unsafe { ShowWindowAsync(handle, SW_MINIMIZE).ok().log_err() };
1123 handled = true;
1124 }
1125 }
1126 HTMAXBUTTON => {
1127 if last_button == HTMAXBUTTON {
1128 if state_ptr.state.borrow().is_maximized() {
1129 unsafe { ShowWindowAsync(handle, SW_NORMAL).ok().log_err() };
1130 } else {
1131 unsafe { ShowWindowAsync(handle, SW_MAXIMIZE).ok().log_err() };
1132 }
1133 handled = true;
1134 }
1135 }
1136 HTCLOSE => {
1137 if last_button == HTCLOSE {
1138 unsafe {
1139 PostMessageW(Some(handle), WM_CLOSE, WPARAM::default(), LPARAM::default())
1140 .log_err()
1141 };
1142 handled = true;
1143 }
1144 }
1145 _ => {}
1146 };
1147 if handled {
1148 return Some(0);
1149 }
1150 }
1151
1152 None
1153}
1154
1155fn handle_cursor_changed(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1156 let mut state = state_ptr.state.borrow_mut();
1157 let had_cursor = state.current_cursor.is_some();
1158
1159 state.current_cursor = if lparam.0 == 0 {
1160 None
1161 } else {
1162 Some(HCURSOR(lparam.0 as _))
1163 };
1164
1165 if had_cursor != state.current_cursor.is_some() {
1166 unsafe { SetCursor(state.current_cursor) };
1167 }
1168
1169 Some(0)
1170}
1171
1172fn handle_set_cursor(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1173 if matches!(
1174 lparam.loword() as u32,
1175 HTLEFT | HTRIGHT | HTTOP | HTTOPLEFT | HTTOPRIGHT | HTBOTTOM | HTBOTTOMLEFT | HTBOTTOMRIGHT
1176 ) {
1177 return None;
1178 }
1179 unsafe {
1180 SetCursor(state_ptr.state.borrow().current_cursor);
1181 };
1182 Some(1)
1183}
1184
1185fn handle_system_settings_changed(
1186 handle: HWND,
1187 lparam: LPARAM,
1188 state_ptr: Rc<WindowsWindowStatePtr>,
1189) -> Option<isize> {
1190 let mut lock = state_ptr.state.borrow_mut();
1191 let display = lock.display;
1192 // system settings
1193 lock.system_settings.update(display);
1194 // mouse double click
1195 lock.click_state.system_update();
1196 // window border offset
1197 lock.border_offset.update(handle).log_err();
1198 drop(lock);
1199
1200 // lParam is a pointer to a string that indicates the area containing the system parameter
1201 // that was changed.
1202 let parameter = PCWSTR::from_raw(lparam.0 as _);
1203 if unsafe { !parameter.is_null() && !parameter.is_empty() } {
1204 if let Some(parameter_string) = unsafe { parameter.to_string() }.log_err() {
1205 log::info!("System settings changed: {}", parameter_string);
1206 match parameter_string.as_str() {
1207 "ImmersiveColorSet" => {
1208 handle_system_theme_changed(handle, state_ptr);
1209 }
1210 _ => {}
1211 }
1212 }
1213 }
1214
1215 // Force to trigger WM_NCCALCSIZE event to ensure that we handle auto hide
1216 // taskbar correctly.
1217 notify_frame_changed(handle);
1218 Some(0)
1219}
1220
1221fn handle_system_command(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1222 if wparam.0 == SC_KEYMENU as usize {
1223 let mut lock = state_ptr.state.borrow_mut();
1224 if lock.system_key_handled {
1225 lock.system_key_handled = false;
1226 return Some(0);
1227 }
1228 }
1229 None
1230}
1231
1232fn handle_system_theme_changed(
1233 handle: HWND,
1234 state_ptr: Rc<WindowsWindowStatePtr>,
1235) -> Option<isize> {
1236 let mut callback = state_ptr
1237 .state
1238 .borrow_mut()
1239 .callbacks
1240 .appearance_changed
1241 .take()?;
1242 callback();
1243 state_ptr.state.borrow_mut().callbacks.appearance_changed = Some(callback);
1244 configure_dwm_dark_mode(handle);
1245 Some(0)
1246}
1247
1248fn parse_syskeydown_msg_keystroke(wparam: WPARAM) -> Option<Keystroke> {
1249 let modifiers = current_modifiers();
1250 let vk_code = wparam.loword();
1251
1252 // on Windows, F10 can trigger this event, not just the alt key,
1253 // so when F10 was pressed, handle only it
1254 if !modifiers.alt {
1255 if vk_code == VK_F10.0 {
1256 let offset = vk_code - VK_F1.0;
1257 return Some(Keystroke {
1258 modifiers,
1259 key: format!("f{}", offset + 1),
1260 key_char: None,
1261 });
1262 } else {
1263 return None;
1264 }
1265 }
1266
1267 let key = match VIRTUAL_KEY(vk_code) {
1268 VK_BACK => "backspace",
1269 VK_RETURN => "enter",
1270 VK_TAB => "tab",
1271 VK_UP => "up",
1272 VK_DOWN => "down",
1273 VK_RIGHT => "right",
1274 VK_LEFT => "left",
1275 VK_HOME => "home",
1276 VK_END => "end",
1277 VK_PRIOR => "pageup",
1278 VK_NEXT => "pagedown",
1279 VK_BROWSER_BACK => "back",
1280 VK_BROWSER_FORWARD => "forward",
1281 VK_ESCAPE => "escape",
1282 VK_INSERT => "insert",
1283 VK_DELETE => "delete",
1284 VK_APPS => "menu",
1285 _ => {
1286 let basic_key = basic_vkcode_to_string(vk_code, modifiers);
1287 if basic_key.is_some() {
1288 return basic_key;
1289 } else {
1290 if vk_code >= VK_F1.0 && vk_code <= VK_F24.0 {
1291 let offset = vk_code - VK_F1.0;
1292 return Some(Keystroke {
1293 modifiers,
1294 key: format!("f{}", offset + 1),
1295 key_char: None,
1296 });
1297 } else {
1298 return None;
1299 }
1300 }
1301 }
1302 }
1303 .to_owned();
1304
1305 Some(Keystroke {
1306 modifiers,
1307 key,
1308 key_char: None,
1309 })
1310}
1311
1312enum KeystrokeOrModifier {
1313 Keystroke(Keystroke),
1314 Modifier(Modifiers),
1315}
1316
1317fn parse_keystroke_from_vkey(wparam: WPARAM, is_keyup: bool) -> Option<KeystrokeOrModifier> {
1318 let vk_code = wparam.loword();
1319
1320 let modifiers = current_modifiers();
1321
1322 let key = match VIRTUAL_KEY(vk_code) {
1323 VK_BACK => "backspace",
1324 VK_RETURN => "enter",
1325 VK_TAB => "tab",
1326 VK_UP => "up",
1327 VK_DOWN => "down",
1328 VK_RIGHT => "right",
1329 VK_LEFT => "left",
1330 VK_HOME => "home",
1331 VK_END => "end",
1332 VK_PRIOR => "pageup",
1333 VK_NEXT => "pagedown",
1334 VK_BROWSER_BACK => "back",
1335 VK_BROWSER_FORWARD => "forward",
1336 VK_ESCAPE => "escape",
1337 VK_INSERT => "insert",
1338 VK_DELETE => "delete",
1339 VK_APPS => "menu",
1340 _ => {
1341 if is_modifier(VIRTUAL_KEY(vk_code)) {
1342 return Some(KeystrokeOrModifier::Modifier(modifiers));
1343 }
1344
1345 if modifiers.control || modifiers.alt || is_keyup {
1346 let basic_key = basic_vkcode_to_string(vk_code, modifiers);
1347 if let Some(basic_key) = basic_key {
1348 return Some(KeystrokeOrModifier::Keystroke(basic_key));
1349 }
1350 }
1351
1352 if vk_code >= VK_F1.0 && vk_code <= VK_F24.0 {
1353 let offset = vk_code - VK_F1.0;
1354 return Some(KeystrokeOrModifier::Keystroke(Keystroke {
1355 modifiers,
1356 key: format!("f{}", offset + 1),
1357 key_char: None,
1358 }));
1359 };
1360 return None;
1361 }
1362 }
1363 .to_owned();
1364
1365 Some(KeystrokeOrModifier::Keystroke(Keystroke {
1366 modifiers,
1367 key,
1368 key_char: None,
1369 }))
1370}
1371
1372fn parse_char_msg_keystroke(wparam: WPARAM) -> Option<Keystroke> {
1373 let first_char = char::from_u32((wparam.0 as u16).into())?;
1374 if first_char.is_control() {
1375 None
1376 } else {
1377 let mut modifiers = current_modifiers();
1378 // for characters that use 'shift' to type it is expected that the
1379 // shift is not reported if the uppercase/lowercase are the same and instead only the key is reported
1380 if first_char.to_ascii_uppercase() == first_char.to_ascii_lowercase() {
1381 modifiers.shift = false;
1382 }
1383 let key = match first_char {
1384 ' ' => "space".to_string(),
1385 first_char => first_char.to_lowercase().to_string(),
1386 };
1387 Some(Keystroke {
1388 modifiers,
1389 key,
1390 key_char: Some(first_char.to_string()),
1391 })
1392 }
1393}
1394
1395fn parse_ime_compostion_string(ctx: HIMC) -> Option<(String, usize)> {
1396 unsafe {
1397 let string_len = ImmGetCompositionStringW(ctx, GCS_COMPSTR, None, 0);
1398 if string_len >= 0 {
1399 let mut buffer = vec![0u8; string_len as usize + 2];
1400 ImmGetCompositionStringW(
1401 ctx,
1402 GCS_COMPSTR,
1403 Some(buffer.as_mut_ptr() as _),
1404 string_len as _,
1405 );
1406 let wstring = std::slice::from_raw_parts::<u16>(
1407 buffer.as_mut_ptr().cast::<u16>(),
1408 string_len as usize / 2,
1409 );
1410 let string = String::from_utf16_lossy(wstring);
1411 Some((string, string_len as usize / 2))
1412 } else {
1413 None
1414 }
1415 }
1416}
1417
1418#[inline]
1419fn retrieve_composition_cursor_position(ctx: HIMC) -> usize {
1420 unsafe { ImmGetCompositionStringW(ctx, GCS_CURSORPOS, None, 0) as usize }
1421}
1422
1423fn parse_ime_compostion_result(ctx: HIMC) -> Option<String> {
1424 unsafe {
1425 let string_len = ImmGetCompositionStringW(ctx, GCS_RESULTSTR, None, 0);
1426 if string_len >= 0 {
1427 let mut buffer = vec![0u8; string_len as usize + 2];
1428 ImmGetCompositionStringW(
1429 ctx,
1430 GCS_RESULTSTR,
1431 Some(buffer.as_mut_ptr() as _),
1432 string_len as _,
1433 );
1434 let wstring = std::slice::from_raw_parts::<u16>(
1435 buffer.as_mut_ptr().cast::<u16>(),
1436 string_len as usize / 2,
1437 );
1438 let string = String::from_utf16_lossy(wstring);
1439 Some(string)
1440 } else {
1441 None
1442 }
1443 }
1444}
1445
1446fn basic_vkcode_to_string(code: u16, modifiers: Modifiers) -> Option<Keystroke> {
1447 let mapped_code = unsafe { MapVirtualKeyW(code as u32, MAPVK_VK_TO_CHAR) };
1448
1449 let key = match mapped_code {
1450 0 => None,
1451 raw_code => char::from_u32(raw_code),
1452 }?
1453 .to_ascii_lowercase();
1454
1455 let key = if matches!(code as u32, 112..=135) {
1456 format!("f{key}")
1457 } else {
1458 key.to_string()
1459 };
1460
1461 Some(Keystroke {
1462 modifiers,
1463 key,
1464 key_char: None,
1465 })
1466}
1467
1468#[inline]
1469fn is_virtual_key_pressed(vkey: VIRTUAL_KEY) -> bool {
1470 unsafe { GetKeyState(vkey.0 as i32) < 0 }
1471}
1472
1473fn is_modifier(virtual_key: VIRTUAL_KEY) -> bool {
1474 matches!(
1475 virtual_key,
1476 VK_CONTROL | VK_MENU | VK_SHIFT | VK_LWIN | VK_RWIN
1477 )
1478}
1479
1480#[inline]
1481pub(crate) fn current_modifiers() -> Modifiers {
1482 Modifiers {
1483 control: is_virtual_key_pressed(VK_CONTROL),
1484 alt: is_virtual_key_pressed(VK_MENU),
1485 shift: is_virtual_key_pressed(VK_SHIFT),
1486 platform: is_virtual_key_pressed(VK_LWIN) || is_virtual_key_pressed(VK_RWIN),
1487 function: false,
1488 }
1489}
1490
1491fn get_client_area_insets(
1492 handle: HWND,
1493 is_maximized: bool,
1494 windows_version: WindowsVersion,
1495) -> RECT {
1496 // For maximized windows, Windows outdents the window rect from the screen's client rect
1497 // by `frame_thickness` on each edge, meaning `insets` must contain `frame_thickness`
1498 // on all sides (including the top) to avoid the client area extending onto adjacent
1499 // monitors.
1500 //
1501 // For non-maximized windows, things become complicated:
1502 //
1503 // - On Windows 10
1504 // The top inset must be zero, since if there is any nonclient area, Windows will draw
1505 // a full native titlebar outside the client area. (This doesn't occur in the maximized
1506 // case.)
1507 //
1508 // - On Windows 11
1509 // The top inset is calculated using an empirical formula that I derived through various
1510 // tests. Without this, the top 1-2 rows of pixels in our window would be obscured.
1511 let dpi = unsafe { GetDpiForWindow(handle) };
1512 let frame_thickness = get_frame_thickness(dpi);
1513 let top_insets = if is_maximized {
1514 frame_thickness
1515 } else {
1516 match windows_version {
1517 WindowsVersion::Win10 => 0,
1518 WindowsVersion::Win11 => (dpi as f32 / USER_DEFAULT_SCREEN_DPI as f32).round() as i32,
1519 }
1520 };
1521 RECT {
1522 left: frame_thickness,
1523 top: top_insets,
1524 right: frame_thickness,
1525 bottom: frame_thickness,
1526 }
1527}
1528
1529// there is some additional non-visible space when talking about window
1530// borders on Windows:
1531// - SM_CXSIZEFRAME: The resize handle.
1532// - SM_CXPADDEDBORDER: Additional border space that isn't part of the resize handle.
1533fn get_frame_thickness(dpi: u32) -> i32 {
1534 let resize_frame_thickness = unsafe { GetSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) };
1535 let padding_thickness = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
1536 resize_frame_thickness + padding_thickness
1537}
1538
1539fn notify_frame_changed(handle: HWND) {
1540 unsafe {
1541 SetWindowPos(
1542 handle,
1543 None,
1544 0,
1545 0,
1546 0,
1547 0,
1548 SWP_FRAMECHANGED
1549 | SWP_NOACTIVATE
1550 | SWP_NOCOPYBITS
1551 | SWP_NOMOVE
1552 | SWP_NOOWNERZORDER
1553 | SWP_NOREPOSITION
1554 | SWP_NOSENDCHANGING
1555 | SWP_NOSIZE
1556 | SWP_NOZORDER,
1557 )
1558 .log_err();
1559 }
1560}
1561
1562fn start_tracking_mouse(
1563 handle: HWND,
1564 state_ptr: &Rc<WindowsWindowStatePtr>,
1565 flags: TRACKMOUSEEVENT_FLAGS,
1566) {
1567 let mut lock = state_ptr.state.borrow_mut();
1568 if !lock.hovered {
1569 lock.hovered = true;
1570 unsafe {
1571 TrackMouseEvent(&mut TRACKMOUSEEVENT {
1572 cbSize: std::mem::size_of::<TRACKMOUSEEVENT>() as u32,
1573 dwFlags: flags,
1574 hwndTrack: handle,
1575 dwHoverTime: HOVER_DEFAULT,
1576 })
1577 .log_err()
1578 };
1579 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
1580 drop(lock);
1581 callback(true);
1582 state_ptr.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
1583 }
1584 }
1585}
1586
1587fn with_input_handler<F, R>(state_ptr: &Rc<WindowsWindowStatePtr>, f: F) -> Option<R>
1588where
1589 F: FnOnce(&mut PlatformInputHandler) -> R,
1590{
1591 let mut input_handler = state_ptr.state.borrow_mut().input_handler.take()?;
1592 let result = f(&mut input_handler);
1593 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
1594 Some(result)
1595}
1596
1597fn with_input_handler_and_scale_factor<F, R>(
1598 state_ptr: &Rc<WindowsWindowStatePtr>,
1599 f: F,
1600) -> Option<R>
1601where
1602 F: FnOnce(&mut PlatformInputHandler, f32) -> Option<R>,
1603{
1604 let mut lock = state_ptr.state.borrow_mut();
1605 let mut input_handler = lock.input_handler.take()?;
1606 let scale_factor = lock.scale_factor;
1607 drop(lock);
1608 let result = f(&mut input_handler, scale_factor);
1609 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
1610 result
1611}