1use std::rc::Rc;
2
3use ::util::ResultExt;
4use anyhow::Context;
5use windows::Win32::{
6 Foundation::*,
7 Graphics::Gdi::*,
8 System::SystemServices::*,
9 UI::{
10 HiDpi::*,
11 Input::{Ime::*, KeyboardAndMouse::*},
12 WindowsAndMessaging::*,
13 },
14};
15
16use crate::*;
17
18pub(crate) const CURSOR_STYLE_CHANGED: u32 = WM_USER + 1;
19pub(crate) const CLOSE_ONE_WINDOW: u32 = WM_USER + 2;
20
21const SIZE_MOVE_LOOP_TIMER_ID: usize = 1;
22
23pub(crate) fn handle_msg(
24 handle: HWND,
25 msg: u32,
26 wparam: WPARAM,
27 lparam: LPARAM,
28 state_ptr: Rc<WindowsWindowStatePtr>,
29) -> LRESULT {
30 let handled = match msg {
31 WM_ACTIVATE => handle_activate_msg(handle, wparam, state_ptr),
32 WM_CREATE => handle_create_msg(handle, state_ptr),
33 WM_MOVE => handle_move_msg(handle, lparam, state_ptr),
34 WM_SIZE => handle_size_msg(lparam, state_ptr),
35 WM_ENTERSIZEMOVE | WM_ENTERMENULOOP => handle_size_move_loop(handle),
36 WM_EXITSIZEMOVE | WM_EXITMENULOOP => handle_size_move_loop_exit(handle),
37 WM_TIMER => handle_timer_msg(handle, wparam, state_ptr),
38 WM_NCCALCSIZE => handle_calc_client_size(handle, wparam, lparam, state_ptr),
39 WM_DPICHANGED => handle_dpi_changed_msg(handle, wparam, lparam, state_ptr),
40 WM_DISPLAYCHANGE => handle_display_change_msg(handle, state_ptr),
41 WM_NCHITTEST => handle_hit_test_msg(handle, msg, wparam, lparam, state_ptr),
42 WM_PAINT => handle_paint_msg(handle, state_ptr),
43 WM_CLOSE => handle_close_msg(state_ptr),
44 WM_DESTROY => handle_destroy_msg(handle, state_ptr),
45 WM_MOUSEMOVE => handle_mouse_move_msg(lparam, wparam, state_ptr),
46 WM_NCMOUSEMOVE => handle_nc_mouse_move_msg(handle, lparam, state_ptr),
47 WM_NCLBUTTONDOWN => {
48 handle_nc_mouse_down_msg(handle, MouseButton::Left, wparam, lparam, state_ptr)
49 }
50 WM_NCRBUTTONDOWN => {
51 handle_nc_mouse_down_msg(handle, MouseButton::Right, wparam, lparam, state_ptr)
52 }
53 WM_NCMBUTTONDOWN => {
54 handle_nc_mouse_down_msg(handle, MouseButton::Middle, wparam, lparam, state_ptr)
55 }
56 WM_NCLBUTTONUP => {
57 handle_nc_mouse_up_msg(handle, MouseButton::Left, wparam, lparam, state_ptr)
58 }
59 WM_NCRBUTTONUP => {
60 handle_nc_mouse_up_msg(handle, MouseButton::Right, wparam, lparam, state_ptr)
61 }
62 WM_NCMBUTTONUP => {
63 handle_nc_mouse_up_msg(handle, MouseButton::Middle, wparam, lparam, state_ptr)
64 }
65 WM_LBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Left, lparam, state_ptr),
66 WM_RBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Right, lparam, state_ptr),
67 WM_MBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Middle, lparam, state_ptr),
68 WM_XBUTTONDOWN => {
69 handle_xbutton_msg(handle, wparam, lparam, handle_mouse_down_msg, state_ptr)
70 }
71 WM_LBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Left, lparam, state_ptr),
72 WM_RBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Right, lparam, state_ptr),
73 WM_MBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Middle, lparam, state_ptr),
74 WM_XBUTTONUP => handle_xbutton_msg(handle, wparam, lparam, handle_mouse_up_msg, state_ptr),
75 WM_MOUSEWHEEL => handle_mouse_wheel_msg(handle, wparam, lparam, state_ptr),
76 WM_MOUSEHWHEEL => handle_mouse_horizontal_wheel_msg(handle, wparam, lparam, state_ptr),
77 WM_SYSKEYDOWN => handle_syskeydown_msg(wparam, lparam, state_ptr),
78 WM_SYSKEYUP => handle_syskeyup_msg(wparam, state_ptr),
79 WM_SYSCOMMAND => handle_system_command(wparam, state_ptr),
80 WM_KEYDOWN => handle_keydown_msg(wparam, lparam, state_ptr),
81 WM_KEYUP => handle_keyup_msg(wparam, state_ptr),
82 WM_CHAR => handle_char_msg(wparam, lparam, state_ptr),
83 WM_IME_STARTCOMPOSITION => handle_ime_position(handle, state_ptr),
84 WM_IME_COMPOSITION => handle_ime_composition(handle, lparam, state_ptr),
85 WM_SETCURSOR => handle_set_cursor(lparam, state_ptr),
86 WM_SETTINGCHANGE => handle_system_settings_changed(handle, state_ptr),
87 CURSOR_STYLE_CHANGED => handle_cursor_changed(lparam, state_ptr),
88 _ => None,
89 };
90 if let Some(n) = handled {
91 LRESULT(n)
92 } else {
93 unsafe { DefWindowProcW(handle, msg, wparam, lparam) }
94 }
95}
96
97fn handle_move_msg(
98 handle: HWND,
99 lparam: LPARAM,
100 state_ptr: Rc<WindowsWindowStatePtr>,
101) -> Option<isize> {
102 let mut lock = state_ptr.state.borrow_mut();
103 let origin = logical_point(
104 lparam.signed_loword() as f32,
105 lparam.signed_hiword() as f32,
106 lock.scale_factor,
107 );
108 lock.origin = origin;
109 let size = lock.logical_size;
110 let center_x = origin.x.0 + size.width.0 / 2.;
111 let center_y = origin.y.0 + size.height.0 / 2.;
112 let monitor_bounds = lock.display.bounds();
113 if center_x < monitor_bounds.left().0
114 || center_x > monitor_bounds.right().0
115 || center_y < monitor_bounds.top().0
116 || center_y > monitor_bounds.bottom().0
117 {
118 // center of the window may have moved to another monitor
119 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
120 // minimize the window can trigger this event too, in this case,
121 // monitor is invalid, we do nothing.
122 if !monitor.is_invalid() && lock.display.handle != monitor {
123 // we will get the same monitor if we only have one
124 lock.display = WindowsDisplay::new_with_handle(monitor);
125 }
126 }
127 if let Some(mut callback) = lock.callbacks.moved.take() {
128 drop(lock);
129 callback();
130 state_ptr.state.borrow_mut().callbacks.moved = Some(callback);
131 }
132 Some(0)
133}
134
135fn handle_size_msg(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
136 let width = lparam.loword().max(1) as i32;
137 let height = lparam.hiword().max(1) as i32;
138 let mut lock = state_ptr.state.borrow_mut();
139 let new_size = size(DevicePixels(width), DevicePixels(height));
140 let scale_factor = lock.scale_factor;
141 lock.renderer.update_drawable_size(new_size);
142 let new_size = new_size.to_pixels(scale_factor);
143 lock.logical_size = new_size;
144 if let Some(mut callback) = lock.callbacks.resize.take() {
145 drop(lock);
146 callback(new_size, scale_factor);
147 state_ptr.state.borrow_mut().callbacks.resize = Some(callback);
148 }
149 Some(0)
150}
151
152fn handle_size_move_loop(handle: HWND) -> Option<isize> {
153 unsafe {
154 let ret = SetTimer(handle, SIZE_MOVE_LOOP_TIMER_ID, USER_TIMER_MINIMUM, None);
155 if ret == 0 {
156 log::error!(
157 "unable to create timer: {}",
158 std::io::Error::last_os_error()
159 );
160 }
161 }
162 None
163}
164
165fn handle_size_move_loop_exit(handle: HWND) -> Option<isize> {
166 unsafe {
167 KillTimer(handle, SIZE_MOVE_LOOP_TIMER_ID).log_err();
168 }
169 None
170}
171
172fn handle_timer_msg(
173 handle: HWND,
174 wparam: WPARAM,
175 state_ptr: Rc<WindowsWindowStatePtr>,
176) -> Option<isize> {
177 if wparam.0 == SIZE_MOVE_LOOP_TIMER_ID {
178 handle_paint_msg(handle, state_ptr)
179 } else {
180 None
181 }
182}
183
184fn handle_paint_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
185 let mut lock = state_ptr.state.borrow_mut();
186 if let Some(mut request_frame) = lock.callbacks.request_frame.take() {
187 drop(lock);
188 request_frame();
189 state_ptr.state.borrow_mut().callbacks.request_frame = Some(request_frame);
190 }
191 unsafe { ValidateRect(handle, None).ok().log_err() };
192 Some(0)
193}
194
195fn handle_close_msg(state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
196 let mut lock = state_ptr.state.borrow_mut();
197 if let Some(mut callback) = lock.callbacks.should_close.take() {
198 drop(lock);
199 let should_close = callback();
200 state_ptr.state.borrow_mut().callbacks.should_close = Some(callback);
201 if should_close {
202 None
203 } else {
204 Some(0)
205 }
206 } else {
207 None
208 }
209}
210
211fn handle_destroy_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
212 let callback = {
213 let mut lock = state_ptr.state.borrow_mut();
214 lock.callbacks.close.take()
215 };
216 if let Some(callback) = callback {
217 callback();
218 }
219 unsafe {
220 PostMessageW(
221 None,
222 CLOSE_ONE_WINDOW,
223 WPARAM(state_ptr.validation_number),
224 LPARAM(handle.0 as isize),
225 )
226 .log_err();
227 }
228 Some(0)
229}
230
231fn handle_mouse_move_msg(
232 lparam: LPARAM,
233 wparam: WPARAM,
234 state_ptr: Rc<WindowsWindowStatePtr>,
235) -> Option<isize> {
236 let mut lock = state_ptr.state.borrow_mut();
237 if let Some(mut callback) = lock.callbacks.input.take() {
238 let scale_factor = lock.scale_factor;
239 drop(lock);
240 let pressed_button = match MODIFIERKEYS_FLAGS(wparam.loword() as u32) {
241 flags if flags.contains(MK_LBUTTON) => Some(MouseButton::Left),
242 flags if flags.contains(MK_RBUTTON) => Some(MouseButton::Right),
243 flags if flags.contains(MK_MBUTTON) => Some(MouseButton::Middle),
244 flags if flags.contains(MK_XBUTTON1) => {
245 Some(MouseButton::Navigate(NavigationDirection::Back))
246 }
247 flags if flags.contains(MK_XBUTTON2) => {
248 Some(MouseButton::Navigate(NavigationDirection::Forward))
249 }
250 _ => None,
251 };
252 let x = lparam.signed_loword() as f32;
253 let y = lparam.signed_hiword() as f32;
254 let event = MouseMoveEvent {
255 position: logical_point(x, y, scale_factor),
256 pressed_button,
257 modifiers: current_modifiers(),
258 };
259 let result = if callback(PlatformInput::MouseMove(event)).default_prevented {
260 Some(0)
261 } else {
262 Some(1)
263 };
264 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
265 return result;
266 }
267 Some(1)
268}
269
270fn handle_syskeydown_msg(
271 wparam: WPARAM,
272 lparam: LPARAM,
273 state_ptr: Rc<WindowsWindowStatePtr>,
274) -> Option<isize> {
275 // we need to call `DefWindowProcW`, or we will lose the system-wide `Alt+F4`, `Alt+{other keys}`
276 // shortcuts.
277 let keystroke = parse_syskeydown_msg_keystroke(wparam)?;
278 let mut func = state_ptr.state.borrow_mut().callbacks.input.take()?;
279 let event = KeyDownEvent {
280 keystroke,
281 is_held: lparam.0 & (0x1 << 30) > 0,
282 };
283 let result = if !func(PlatformInput::KeyDown(event)).propagate {
284 state_ptr.state.borrow_mut().system_key_handled = true;
285 Some(0)
286 } else {
287 None
288 };
289 state_ptr.state.borrow_mut().callbacks.input = Some(func);
290
291 result
292}
293
294fn handle_syskeyup_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
295 // we need to call `DefWindowProcW`, or we will lose the system-wide `Alt+F4`, `Alt+{other keys}`
296 // shortcuts.
297 let keystroke = parse_syskeydown_msg_keystroke(wparam)?;
298 let mut func = state_ptr.state.borrow_mut().callbacks.input.take()?;
299 let event = KeyUpEvent { keystroke };
300 let result = if func(PlatformInput::KeyUp(event)).default_prevented {
301 Some(0)
302 } else {
303 Some(1)
304 };
305 state_ptr.state.borrow_mut().callbacks.input = Some(func);
306
307 result
308}
309
310fn handle_keydown_msg(
311 wparam: WPARAM,
312 lparam: LPARAM,
313 state_ptr: Rc<WindowsWindowStatePtr>,
314) -> Option<isize> {
315 let Some(keystroke_or_modifier) = parse_keydown_msg_keystroke(wparam) else {
316 return Some(1);
317 };
318 let mut lock = state_ptr.state.borrow_mut();
319 let Some(mut func) = lock.callbacks.input.take() else {
320 return Some(1);
321 };
322 drop(lock);
323
324 let event = match keystroke_or_modifier {
325 KeystrokeOrModifier::Keystroke(keystroke) => PlatformInput::KeyDown(KeyDownEvent {
326 keystroke,
327 is_held: lparam.0 & (0x1 << 30) > 0,
328 }),
329 KeystrokeOrModifier::Modifier(modifiers) => {
330 PlatformInput::ModifiersChanged(ModifiersChangedEvent { modifiers })
331 }
332 };
333
334 let result = if func(event).default_prevented {
335 Some(0)
336 } else {
337 Some(1)
338 };
339 state_ptr.state.borrow_mut().callbacks.input = Some(func);
340
341 result
342}
343
344fn handle_keyup_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
345 let Some(keystroke_or_modifier) = parse_keydown_msg_keystroke(wparam) else {
346 return Some(1);
347 };
348 let mut lock = state_ptr.state.borrow_mut();
349 let Some(mut func) = lock.callbacks.input.take() else {
350 return Some(1);
351 };
352 drop(lock);
353
354 let event = match keystroke_or_modifier {
355 KeystrokeOrModifier::Keystroke(keystroke) => PlatformInput::KeyUp(KeyUpEvent { keystroke }),
356 KeystrokeOrModifier::Modifier(modifiers) => {
357 PlatformInput::ModifiersChanged(ModifiersChangedEvent { modifiers })
358 }
359 };
360
361 let result = if func(event).default_prevented {
362 Some(0)
363 } else {
364 Some(1)
365 };
366 state_ptr.state.borrow_mut().callbacks.input = Some(func);
367
368 result
369}
370
371fn handle_char_msg(
372 wparam: WPARAM,
373 lparam: LPARAM,
374 state_ptr: Rc<WindowsWindowStatePtr>,
375) -> Option<isize> {
376 let Some(keystroke) = parse_char_msg_keystroke(wparam) else {
377 return Some(1);
378 };
379 let mut lock = state_ptr.state.borrow_mut();
380 let Some(mut func) = lock.callbacks.input.take() else {
381 return Some(1);
382 };
383 drop(lock);
384 let ime_key = keystroke.ime_key.clone();
385 let event = KeyDownEvent {
386 keystroke,
387 is_held: lparam.0 & (0x1 << 30) > 0,
388 };
389
390 let dispatch_event_result = func(PlatformInput::KeyDown(event));
391 let mut lock = state_ptr.state.borrow_mut();
392 lock.callbacks.input = Some(func);
393 if dispatch_event_result.default_prevented || !dispatch_event_result.propagate {
394 return Some(0);
395 }
396 let Some(ime_char) = ime_key else {
397 return Some(1);
398 };
399 let Some(mut input_handler) = lock.input_handler.take() else {
400 return Some(1);
401 };
402 drop(lock);
403 input_handler.replace_text_in_range(None, &ime_char);
404 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
405
406 Some(0)
407}
408
409fn handle_mouse_down_msg(
410 handle: HWND,
411 button: MouseButton,
412 lparam: LPARAM,
413 state_ptr: Rc<WindowsWindowStatePtr>,
414) -> Option<isize> {
415 unsafe { SetCapture(handle) };
416 let mut lock = state_ptr.state.borrow_mut();
417 if let Some(mut callback) = lock.callbacks.input.take() {
418 let x = lparam.signed_loword() as f32;
419 let y = lparam.signed_hiword() as f32;
420 let physical_point = point(DevicePixels(x as i32), DevicePixels(y as i32));
421 let click_count = lock.click_state.update(button, physical_point);
422 let scale_factor = lock.scale_factor;
423 drop(lock);
424
425 let event = MouseDownEvent {
426 button,
427 position: logical_point(x, y, scale_factor),
428 modifiers: current_modifiers(),
429 click_count,
430 first_mouse: false,
431 };
432 let result = if callback(PlatformInput::MouseDown(event)).default_prevented {
433 Some(0)
434 } else {
435 Some(1)
436 };
437 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
438
439 result
440 } else {
441 Some(1)
442 }
443}
444
445fn handle_mouse_up_msg(
446 _handle: HWND,
447 button: MouseButton,
448 lparam: LPARAM,
449 state_ptr: Rc<WindowsWindowStatePtr>,
450) -> Option<isize> {
451 unsafe { ReleaseCapture().log_err() };
452 let mut lock = state_ptr.state.borrow_mut();
453 if let Some(mut callback) = lock.callbacks.input.take() {
454 let x = lparam.signed_loword() as f32;
455 let y = lparam.signed_hiword() as f32;
456 let click_count = lock.click_state.current_count;
457 let scale_factor = lock.scale_factor;
458 drop(lock);
459
460 let event = MouseUpEvent {
461 button,
462 position: logical_point(x, y, scale_factor),
463 modifiers: current_modifiers(),
464 click_count,
465 };
466 let result = if callback(PlatformInput::MouseUp(event)).default_prevented {
467 Some(0)
468 } else {
469 Some(1)
470 };
471 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
472
473 result
474 } else {
475 Some(1)
476 }
477}
478
479fn handle_xbutton_msg(
480 handle: HWND,
481 wparam: WPARAM,
482 lparam: LPARAM,
483 handler: impl Fn(HWND, MouseButton, LPARAM, Rc<WindowsWindowStatePtr>) -> Option<isize>,
484 state_ptr: Rc<WindowsWindowStatePtr>,
485) -> Option<isize> {
486 let nav_dir = match wparam.hiword() {
487 XBUTTON1 => NavigationDirection::Back,
488 XBUTTON2 => NavigationDirection::Forward,
489 _ => return Some(1),
490 };
491 handler(handle, MouseButton::Navigate(nav_dir), lparam, state_ptr)
492}
493
494fn handle_mouse_wheel_msg(
495 handle: HWND,
496 wparam: WPARAM,
497 lparam: LPARAM,
498 state_ptr: Rc<WindowsWindowStatePtr>,
499) -> Option<isize> {
500 let modifiers = current_modifiers();
501 let mut lock = state_ptr.state.borrow_mut();
502 if let Some(mut callback) = lock.callbacks.input.take() {
503 let scale_factor = lock.scale_factor;
504 let wheel_scroll_amount = match modifiers.shift {
505 true => lock.system_settings.mouse_wheel_settings.wheel_scroll_chars,
506 false => lock.system_settings.mouse_wheel_settings.wheel_scroll_lines,
507 };
508 drop(lock);
509 let wheel_distance =
510 (wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_amount as f32;
511 let mut cursor_point = POINT {
512 x: lparam.signed_loword().into(),
513 y: lparam.signed_hiword().into(),
514 };
515 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
516 let event = ScrollWheelEvent {
517 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
518 delta: ScrollDelta::Lines(match modifiers.shift {
519 true => Point {
520 x: wheel_distance,
521 y: 0.0,
522 },
523 false => Point {
524 y: wheel_distance,
525 x: 0.0,
526 },
527 }),
528 modifiers: current_modifiers(),
529 touch_phase: TouchPhase::Moved,
530 };
531 let result = if callback(PlatformInput::ScrollWheel(event)).default_prevented {
532 Some(0)
533 } else {
534 Some(1)
535 };
536 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
537
538 result
539 } else {
540 Some(1)
541 }
542}
543
544fn handle_mouse_horizontal_wheel_msg(
545 handle: HWND,
546 wparam: WPARAM,
547 lparam: LPARAM,
548 state_ptr: Rc<WindowsWindowStatePtr>,
549) -> Option<isize> {
550 let mut lock = state_ptr.state.borrow_mut();
551 if let Some(mut callback) = lock.callbacks.input.take() {
552 let scale_factor = lock.scale_factor;
553 let wheel_scroll_chars = lock.system_settings.mouse_wheel_settings.wheel_scroll_chars;
554 drop(lock);
555 let wheel_distance =
556 (-wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_chars as f32;
557 let mut cursor_point = POINT {
558 x: lparam.signed_loword().into(),
559 y: lparam.signed_hiword().into(),
560 };
561 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
562 let event = ScrollWheelEvent {
563 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
564 delta: ScrollDelta::Lines(Point {
565 x: wheel_distance,
566 y: 0.0,
567 }),
568 modifiers: current_modifiers(),
569 touch_phase: TouchPhase::Moved,
570 };
571 let result = if callback(PlatformInput::ScrollWheel(event)).default_prevented {
572 Some(0)
573 } else {
574 Some(1)
575 };
576 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
577
578 result
579 } else {
580 Some(1)
581 }
582}
583
584fn handle_ime_position(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
585 unsafe {
586 let mut lock = state_ptr.state.borrow_mut();
587 let ctx = ImmGetContext(handle);
588 let Some(mut input_handler) = lock.input_handler.take() else {
589 return Some(1);
590 };
591 let scale_factor = lock.scale_factor;
592 drop(lock);
593
594 let Some(caret_range) = input_handler.selected_text_range() else {
595 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
596 return Some(0);
597 };
598 let caret_position = input_handler.bounds_for_range(caret_range).unwrap();
599 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
600 let config = CANDIDATEFORM {
601 dwStyle: CFS_CANDIDATEPOS,
602 // logical to physical
603 ptCurrentPos: POINT {
604 x: (caret_position.origin.x.0 * scale_factor) as i32,
605 y: (caret_position.origin.y.0 * scale_factor) as i32
606 + ((caret_position.size.height.0 * scale_factor) as i32 / 2),
607 },
608 ..Default::default()
609 };
610 ImmSetCandidateWindow(ctx, &config as _).ok().log_err();
611 ImmReleaseContext(handle, ctx).ok().log_err();
612 Some(0)
613 }
614}
615
616fn handle_ime_composition(
617 handle: HWND,
618 lparam: LPARAM,
619 state_ptr: Rc<WindowsWindowStatePtr>,
620) -> Option<isize> {
621 let mut ime_input = None;
622 if lparam.0 as u32 & GCS_COMPSTR.0 > 0 {
623 let (comp_string, string_len) = parse_ime_compostion_string(handle)?;
624 let mut input_handler = state_ptr.state.borrow_mut().input_handler.take()?;
625 input_handler.replace_and_mark_text_in_range(
626 None,
627 &comp_string,
628 Some(string_len..string_len),
629 );
630 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
631 ime_input = Some(comp_string);
632 }
633 if lparam.0 as u32 & GCS_CURSORPOS.0 > 0 {
634 let comp_string = &ime_input?;
635 let caret_pos = retrieve_composition_cursor_position(handle);
636 let mut input_handler = state_ptr.state.borrow_mut().input_handler.take()?;
637 input_handler.replace_and_mark_text_in_range(None, comp_string, Some(caret_pos..caret_pos));
638 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
639 }
640 if lparam.0 as u32 & GCS_RESULTSTR.0 > 0 {
641 let comp_result = parse_ime_compostion_result(handle)?;
642 let mut lock = state_ptr.state.borrow_mut();
643 let Some(mut input_handler) = lock.input_handler.take() else {
644 return Some(1);
645 };
646 drop(lock);
647 input_handler.replace_text_in_range(None, &comp_result);
648 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
649 return Some(0);
650 }
651 // currently, we don't care other stuff
652 None
653}
654
655/// SEE: https://learn.microsoft.com/en-us/windows/win32/winmsg/wm-nccalcsize
656fn handle_calc_client_size(
657 handle: HWND,
658 wparam: WPARAM,
659 lparam: LPARAM,
660 state_ptr: Rc<WindowsWindowStatePtr>,
661) -> Option<isize> {
662 if !state_ptr.hide_title_bar || state_ptr.state.borrow().is_fullscreen() || wparam.0 == 0 {
663 return None;
664 }
665
666 let dpi = unsafe { GetDpiForWindow(handle) };
667
668 let frame_x = unsafe { GetSystemMetricsForDpi(SM_CXFRAME, dpi) };
669 let frame_y = unsafe { GetSystemMetricsForDpi(SM_CYFRAME, dpi) };
670 let padding = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
671
672 // wparam is TRUE so lparam points to an NCCALCSIZE_PARAMS structure
673 let mut params = lparam.0 as *mut NCCALCSIZE_PARAMS;
674 let mut requested_client_rect = unsafe { &mut ((*params).rgrc) };
675
676 requested_client_rect[0].right -= frame_x + padding;
677 requested_client_rect[0].left += frame_x + padding;
678 requested_client_rect[0].bottom -= frame_y + padding;
679
680 if state_ptr.state.borrow().is_maximized() {
681 requested_client_rect[0].top += frame_y + padding;
682 } else {
683 match state_ptr.windows_version {
684 WindowsVersion::Win10 => {}
685 WindowsVersion::Win11 => {
686 // Magic number that calculates the width of the border
687 let border = (dpi as f32 / USER_DEFAULT_SCREEN_DPI as f32).round() as i32;
688 requested_client_rect[0].top += border;
689 }
690 }
691 }
692
693 Some(0)
694}
695
696fn handle_activate_msg(
697 handle: HWND,
698 wparam: WPARAM,
699 state_ptr: Rc<WindowsWindowStatePtr>,
700) -> Option<isize> {
701 let activated = wparam.loword() > 0;
702 if state_ptr.hide_title_bar {
703 if let Some(titlebar_rect) = state_ptr.state.borrow().get_titlebar_rect().log_err() {
704 unsafe {
705 InvalidateRect(handle, Some(&titlebar_rect), FALSE)
706 .ok()
707 .log_err()
708 };
709 }
710 }
711 let this = state_ptr.clone();
712 state_ptr
713 .executor
714 .spawn(async move {
715 let mut lock = this.state.borrow_mut();
716 if let Some(mut cb) = lock.callbacks.active_status_change.take() {
717 drop(lock);
718 cb(activated);
719 this.state.borrow_mut().callbacks.active_status_change = Some(cb);
720 }
721 })
722 .detach();
723
724 None
725}
726
727fn handle_create_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
728 let mut size_rect = RECT::default();
729 unsafe { GetWindowRect(handle, &mut size_rect).log_err() };
730
731 let width = size_rect.right - size_rect.left;
732 let height = size_rect.bottom - size_rect.top;
733
734 if state_ptr.hide_title_bar {
735 unsafe {
736 SetWindowPos(
737 handle,
738 None,
739 size_rect.left,
740 size_rect.top,
741 width,
742 height,
743 SWP_FRAMECHANGED | SWP_NOMOVE | SWP_NOSIZE,
744 )
745 .log_err()
746 };
747 }
748
749 Some(0)
750}
751
752fn handle_dpi_changed_msg(
753 handle: HWND,
754 wparam: WPARAM,
755 lparam: LPARAM,
756 state_ptr: Rc<WindowsWindowStatePtr>,
757) -> Option<isize> {
758 let new_dpi = wparam.loword() as f32;
759 let mut lock = state_ptr.state.borrow_mut();
760 lock.scale_factor = new_dpi / USER_DEFAULT_SCREEN_DPI as f32;
761 lock.border_offset.udpate(handle).log_err();
762 drop(lock);
763
764 let rect = unsafe { &*(lparam.0 as *const RECT) };
765 let width = rect.right - rect.left;
766 let height = rect.bottom - rect.top;
767 // this will emit `WM_SIZE` and `WM_MOVE` right here
768 // even before this function returns
769 // the new size is handled in `WM_SIZE`
770 unsafe {
771 SetWindowPos(
772 handle,
773 None,
774 rect.left,
775 rect.top,
776 width,
777 height,
778 SWP_NOZORDER | SWP_NOACTIVATE,
779 )
780 .context("unable to set window position after dpi has changed")
781 .log_err();
782 }
783
784 Some(0)
785}
786
787/// The following conditions will trigger this event:
788/// 1. The monitor on which the window is located goes offline or changes resolution.
789/// 2. Another monitor goes offline, is plugged in, or changes resolution.
790///
791/// In either case, the window will only receive information from the monitor on which
792/// it is located.
793///
794/// For example, in the case of condition 2, where the monitor on which the window is
795/// located has actually changed nothing, it will still receive this event.
796fn handle_display_change_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
797 // NOTE:
798 // Even the `lParam` holds the resolution of the screen, we just ignore it.
799 // Because WM_DPICHANGED, WM_MOVE, WM_SIEZ will come first, window reposition and resize
800 // are handled there.
801 // So we only care about if monitor is disconnected.
802 let previous_monitor = state_ptr.as_ref().state.borrow().display;
803 if WindowsDisplay::is_connected(previous_monitor.handle) {
804 // we are fine, other display changed
805 return None;
806 }
807 // display disconnected
808 // in this case, the OS will move our window to another monitor, and minimize it.
809 // we deminimize the window and query the monitor after moving
810 unsafe {
811 let _ = ShowWindow(handle, SW_SHOWNORMAL);
812 };
813 let new_monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
814 // all monitors disconnected
815 if new_monitor.is_invalid() {
816 log::error!("No monitor detected!");
817 return None;
818 }
819 let new_display = WindowsDisplay::new_with_handle(new_monitor);
820 state_ptr.as_ref().state.borrow_mut().display = new_display;
821 Some(0)
822}
823
824fn handle_hit_test_msg(
825 handle: HWND,
826 msg: u32,
827 wparam: WPARAM,
828 lparam: LPARAM,
829 state_ptr: Rc<WindowsWindowStatePtr>,
830) -> Option<isize> {
831 if !state_ptr.is_movable {
832 return None;
833 }
834 if !state_ptr.hide_title_bar {
835 return None;
836 }
837
838 // default handler for resize areas
839 let hit = unsafe { DefWindowProcW(handle, msg, wparam, lparam) };
840 if matches!(
841 hit.0 as u32,
842 HTNOWHERE
843 | HTRIGHT
844 | HTLEFT
845 | HTTOPLEFT
846 | HTTOP
847 | HTTOPRIGHT
848 | HTBOTTOMRIGHT
849 | HTBOTTOM
850 | HTBOTTOMLEFT
851 ) {
852 return Some(hit.0);
853 }
854
855 if state_ptr.state.borrow().is_fullscreen() {
856 return Some(HTCLIENT as _);
857 }
858
859 let dpi = unsafe { GetDpiForWindow(handle) };
860 let frame_y = unsafe { GetSystemMetricsForDpi(SM_CYFRAME, dpi) };
861
862 let mut cursor_point = POINT {
863 x: lparam.signed_loword().into(),
864 y: lparam.signed_hiword().into(),
865 };
866 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
867 if !state_ptr.state.borrow().is_maximized() && cursor_point.y >= 0 && cursor_point.y <= frame_y
868 {
869 return Some(HTTOP as _);
870 }
871
872 let titlebar_rect = state_ptr.state.borrow().get_titlebar_rect();
873 if let Ok(titlebar_rect) = titlebar_rect {
874 if cursor_point.y < titlebar_rect.bottom {
875 let caption_btn_width = (state_ptr.state.borrow().caption_button_width().0
876 * state_ptr.state.borrow().scale_factor) as i32;
877 if cursor_point.x >= titlebar_rect.right - caption_btn_width {
878 return Some(HTCLOSE as _);
879 } else if cursor_point.x >= titlebar_rect.right - caption_btn_width * 2 {
880 return Some(HTMAXBUTTON as _);
881 } else if cursor_point.x >= titlebar_rect.right - caption_btn_width * 3 {
882 return Some(HTMINBUTTON as _);
883 }
884
885 return Some(HTCAPTION as _);
886 }
887 }
888
889 Some(HTCLIENT as _)
890}
891
892fn handle_nc_mouse_move_msg(
893 handle: HWND,
894 lparam: LPARAM,
895 state_ptr: Rc<WindowsWindowStatePtr>,
896) -> Option<isize> {
897 if !state_ptr.hide_title_bar {
898 return None;
899 }
900
901 let mut lock = state_ptr.state.borrow_mut();
902 if let Some(mut callback) = lock.callbacks.input.take() {
903 let scale_factor = lock.scale_factor;
904 drop(lock);
905 let mut cursor_point = POINT {
906 x: lparam.signed_loword().into(),
907 y: lparam.signed_hiword().into(),
908 };
909 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
910 let event = MouseMoveEvent {
911 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
912 pressed_button: None,
913 modifiers: current_modifiers(),
914 };
915 let result = if callback(PlatformInput::MouseMove(event)).default_prevented {
916 Some(0)
917 } else {
918 Some(1)
919 };
920 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
921
922 result
923 } else {
924 None
925 }
926}
927
928fn handle_nc_mouse_down_msg(
929 handle: HWND,
930 button: MouseButton,
931 wparam: WPARAM,
932 lparam: LPARAM,
933 state_ptr: Rc<WindowsWindowStatePtr>,
934) -> Option<isize> {
935 if !state_ptr.hide_title_bar {
936 return None;
937 }
938
939 let mut lock = state_ptr.state.borrow_mut();
940 if let Some(mut callback) = lock.callbacks.input.take() {
941 let scale_factor = lock.scale_factor;
942 let mut cursor_point = POINT {
943 x: lparam.signed_loword().into(),
944 y: lparam.signed_hiword().into(),
945 };
946 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
947 let physical_point = point(DevicePixels(cursor_point.x), DevicePixels(cursor_point.y));
948 let click_count = lock.click_state.update(button, physical_point);
949 drop(lock);
950 let event = MouseDownEvent {
951 button,
952 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
953 modifiers: current_modifiers(),
954 click_count,
955 first_mouse: false,
956 };
957 let result = if callback(PlatformInput::MouseDown(event)).default_prevented {
958 Some(0)
959 } else {
960 None
961 };
962 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
963
964 if result.is_some() {
965 return result;
966 }
967 } else {
968 drop(lock);
969 };
970
971 // Since these are handled in handle_nc_mouse_up_msg we must prevent the default window proc
972 if button == MouseButton::Left {
973 match wparam.0 as u32 {
974 HTMINBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMINBUTTON),
975 HTMAXBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMAXBUTTON),
976 HTCLOSE => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTCLOSE),
977 _ => return None,
978 };
979 Some(0)
980 } else {
981 None
982 }
983}
984
985fn handle_nc_mouse_up_msg(
986 handle: HWND,
987 button: MouseButton,
988 wparam: WPARAM,
989 lparam: LPARAM,
990 state_ptr: Rc<WindowsWindowStatePtr>,
991) -> Option<isize> {
992 if !state_ptr.hide_title_bar {
993 return None;
994 }
995
996 let mut lock = state_ptr.state.borrow_mut();
997 if let Some(mut callback) = lock.callbacks.input.take() {
998 let scale_factor = lock.scale_factor;
999 drop(lock);
1000 let mut cursor_point = POINT {
1001 x: lparam.signed_loword().into(),
1002 y: lparam.signed_hiword().into(),
1003 };
1004 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1005 let event = MouseUpEvent {
1006 button,
1007 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1008 modifiers: current_modifiers(),
1009 click_count: 1,
1010 };
1011 let result = if callback(PlatformInput::MouseUp(event)).default_prevented {
1012 Some(0)
1013 } else {
1014 None
1015 };
1016 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
1017 if result.is_some() {
1018 return result;
1019 }
1020 } else {
1021 drop(lock);
1022 }
1023
1024 let last_pressed = state_ptr.state.borrow_mut().nc_button_pressed.take();
1025 if button == MouseButton::Left && last_pressed.is_some() {
1026 let last_button = last_pressed.unwrap();
1027 let mut handled = false;
1028 match wparam.0 as u32 {
1029 HTMINBUTTON => {
1030 if last_button == HTMINBUTTON {
1031 unsafe { ShowWindowAsync(handle, SW_MINIMIZE).ok().log_err() };
1032 handled = true;
1033 }
1034 }
1035 HTMAXBUTTON => {
1036 if last_button == HTMAXBUTTON {
1037 if state_ptr.state.borrow().is_maximized() {
1038 unsafe { ShowWindowAsync(handle, SW_NORMAL).ok().log_err() };
1039 } else {
1040 unsafe { ShowWindowAsync(handle, SW_MAXIMIZE).ok().log_err() };
1041 }
1042 handled = true;
1043 }
1044 }
1045 HTCLOSE => {
1046 if last_button == HTCLOSE {
1047 unsafe {
1048 PostMessageW(handle, WM_CLOSE, WPARAM::default(), LPARAM::default())
1049 .log_err()
1050 };
1051 handled = true;
1052 }
1053 }
1054 _ => {}
1055 };
1056 if handled {
1057 return Some(0);
1058 }
1059 }
1060
1061 None
1062}
1063
1064fn handle_cursor_changed(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1065 state_ptr.state.borrow_mut().current_cursor = HCURSOR(lparam.0 as _);
1066 Some(0)
1067}
1068
1069fn handle_set_cursor(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1070 if matches!(
1071 lparam.loword() as u32,
1072 HTLEFT | HTRIGHT | HTTOP | HTTOPLEFT | HTTOPRIGHT | HTBOTTOM | HTBOTTOMLEFT | HTBOTTOMRIGHT
1073 ) {
1074 return None;
1075 }
1076 unsafe { SetCursor(state_ptr.state.borrow().current_cursor) };
1077 Some(1)
1078}
1079
1080fn handle_system_settings_changed(
1081 handle: HWND,
1082 state_ptr: Rc<WindowsWindowStatePtr>,
1083) -> Option<isize> {
1084 let mut lock = state_ptr.state.borrow_mut();
1085 // mouse wheel
1086 lock.system_settings.mouse_wheel_settings.update();
1087 // mouse double click
1088 lock.click_state.system_update();
1089 // window border offset
1090 lock.border_offset.udpate(handle).log_err();
1091 Some(0)
1092}
1093
1094fn handle_system_command(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1095 if wparam.0 == SC_KEYMENU as usize {
1096 let mut lock = state_ptr.state.borrow_mut();
1097 if lock.system_key_handled {
1098 lock.system_key_handled = false;
1099 return Some(0);
1100 }
1101 }
1102 None
1103}
1104
1105fn parse_syskeydown_msg_keystroke(wparam: WPARAM) -> Option<Keystroke> {
1106 let modifiers = current_modifiers();
1107 if !modifiers.alt {
1108 // on Windows, F10 can trigger this event, not just the alt key
1109 // and we just don't care about F10
1110 return None;
1111 }
1112
1113 let vk_code = wparam.loword();
1114
1115 let key = match VIRTUAL_KEY(vk_code) {
1116 VK_BACK => "backspace",
1117 VK_RETURN => "enter",
1118 VK_TAB => "tab",
1119 VK_UP => "up",
1120 VK_DOWN => "down",
1121 VK_RIGHT => "right",
1122 VK_LEFT => "left",
1123 VK_HOME => "home",
1124 VK_END => "end",
1125 VK_PRIOR => "pageup",
1126 VK_NEXT => "pagedown",
1127 VK_ESCAPE => "escape",
1128 VK_INSERT => "insert",
1129 VK_DELETE => "delete",
1130 _ => return basic_vkcode_to_string(vk_code, modifiers),
1131 }
1132 .to_owned();
1133
1134 Some(Keystroke {
1135 modifiers,
1136 key,
1137 ime_key: None,
1138 })
1139}
1140
1141enum KeystrokeOrModifier {
1142 Keystroke(Keystroke),
1143 Modifier(Modifiers),
1144}
1145
1146fn parse_keydown_msg_keystroke(wparam: WPARAM) -> Option<KeystrokeOrModifier> {
1147 let vk_code = wparam.loword();
1148
1149 let modifiers = current_modifiers();
1150
1151 let key = match VIRTUAL_KEY(vk_code) {
1152 VK_BACK => "backspace",
1153 VK_RETURN => "enter",
1154 VK_TAB => "tab",
1155 VK_UP => "up",
1156 VK_DOWN => "down",
1157 VK_RIGHT => "right",
1158 VK_LEFT => "left",
1159 VK_HOME => "home",
1160 VK_END => "end",
1161 VK_PRIOR => "pageup",
1162 VK_NEXT => "pagedown",
1163 VK_ESCAPE => "escape",
1164 VK_INSERT => "insert",
1165 VK_DELETE => "delete",
1166 _ => {
1167 if is_modifier(VIRTUAL_KEY(vk_code)) {
1168 return Some(KeystrokeOrModifier::Modifier(modifiers));
1169 }
1170
1171 if modifiers.control || modifiers.alt {
1172 let basic_key = basic_vkcode_to_string(vk_code, modifiers);
1173 if let Some(basic_key) = basic_key {
1174 return Some(KeystrokeOrModifier::Keystroke(basic_key));
1175 }
1176 }
1177
1178 if vk_code >= VK_F1.0 && vk_code <= VK_F24.0 {
1179 let offset = vk_code - VK_F1.0;
1180 return Some(KeystrokeOrModifier::Keystroke(Keystroke {
1181 modifiers,
1182 key: format!("f{}", offset + 1),
1183 ime_key: None,
1184 }));
1185 };
1186 return None;
1187 }
1188 }
1189 .to_owned();
1190
1191 Some(KeystrokeOrModifier::Keystroke(Keystroke {
1192 modifiers,
1193 key,
1194 ime_key: None,
1195 }))
1196}
1197
1198fn parse_char_msg_keystroke(wparam: WPARAM) -> Option<Keystroke> {
1199 let first_char = char::from_u32((wparam.0 as u16).into())?;
1200 if first_char.is_control() {
1201 None
1202 } else {
1203 let mut modifiers = current_modifiers();
1204 // for characters that use 'shift' to type it is expected that the
1205 // shift is not reported if the uppercase/lowercase are the same and instead only the key is reported
1206 if first_char.to_ascii_uppercase() == first_char.to_ascii_lowercase() {
1207 modifiers.shift = false;
1208 }
1209 let key = match first_char {
1210 ' ' => "space".to_string(),
1211 first_char => first_char.to_lowercase().to_string(),
1212 };
1213 Some(Keystroke {
1214 modifiers,
1215 key,
1216 ime_key: Some(first_char.to_string()),
1217 })
1218 }
1219}
1220
1221fn parse_ime_compostion_string(handle: HWND) -> Option<(String, usize)> {
1222 unsafe {
1223 let ctx = ImmGetContext(handle);
1224 let string_len = ImmGetCompositionStringW(ctx, GCS_COMPSTR, None, 0);
1225 let result = if string_len >= 0 {
1226 let mut buffer = vec![0u8; string_len as usize + 2];
1227 ImmGetCompositionStringW(
1228 ctx,
1229 GCS_COMPSTR,
1230 Some(buffer.as_mut_ptr() as _),
1231 string_len as _,
1232 );
1233 let wstring = std::slice::from_raw_parts::<u16>(
1234 buffer.as_mut_ptr().cast::<u16>(),
1235 string_len as usize / 2,
1236 );
1237 let string = String::from_utf16_lossy(wstring);
1238 Some((string, string_len as usize / 2))
1239 } else {
1240 None
1241 };
1242 ImmReleaseContext(handle, ctx).ok().log_err();
1243 result
1244 }
1245}
1246
1247fn retrieve_composition_cursor_position(handle: HWND) -> usize {
1248 unsafe {
1249 let ctx = ImmGetContext(handle);
1250 let ret = ImmGetCompositionStringW(ctx, GCS_CURSORPOS, None, 0);
1251 ImmReleaseContext(handle, ctx).ok().log_err();
1252 ret as usize
1253 }
1254}
1255
1256fn parse_ime_compostion_result(handle: HWND) -> Option<String> {
1257 unsafe {
1258 let ctx = ImmGetContext(handle);
1259 let string_len = ImmGetCompositionStringW(ctx, GCS_RESULTSTR, None, 0);
1260 let result = if string_len >= 0 {
1261 let mut buffer = vec![0u8; string_len as usize + 2];
1262 ImmGetCompositionStringW(
1263 ctx,
1264 GCS_RESULTSTR,
1265 Some(buffer.as_mut_ptr() as _),
1266 string_len as _,
1267 );
1268 let wstring = std::slice::from_raw_parts::<u16>(
1269 buffer.as_mut_ptr().cast::<u16>(),
1270 string_len as usize / 2,
1271 );
1272 let string = String::from_utf16_lossy(wstring);
1273 Some(string)
1274 } else {
1275 None
1276 };
1277 ImmReleaseContext(handle, ctx).ok().log_err();
1278 result
1279 }
1280}
1281
1282fn basic_vkcode_to_string(code: u16, modifiers: Modifiers) -> Option<Keystroke> {
1283 let mapped_code = unsafe { MapVirtualKeyW(code as u32, MAPVK_VK_TO_CHAR) };
1284
1285 let key = match mapped_code {
1286 0 => None,
1287 raw_code => char::from_u32(raw_code),
1288 }?
1289 .to_ascii_lowercase();
1290
1291 let key = if matches!(code as u32, 112..=135) {
1292 format!("f{key}")
1293 } else {
1294 key.to_string()
1295 };
1296
1297 Some(Keystroke {
1298 modifiers,
1299 key,
1300 ime_key: None,
1301 })
1302}
1303
1304#[inline]
1305fn is_virtual_key_pressed(vkey: VIRTUAL_KEY) -> bool {
1306 unsafe { GetKeyState(vkey.0 as i32) < 0 }
1307}
1308
1309fn is_modifier(virtual_key: VIRTUAL_KEY) -> bool {
1310 matches!(
1311 virtual_key,
1312 VK_CONTROL | VK_MENU | VK_SHIFT | VK_LWIN | VK_RWIN
1313 )
1314}
1315
1316#[inline]
1317pub(crate) fn current_modifiers() -> Modifiers {
1318 Modifiers {
1319 control: is_virtual_key_pressed(VK_CONTROL),
1320 alt: is_virtual_key_pressed(VK_MENU),
1321 shift: is_virtual_key_pressed(VK_SHIFT),
1322 platform: is_virtual_key_pressed(VK_LWIN) || is_virtual_key_pressed(VK_RWIN),
1323 function: false,
1324 }
1325}