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 Controls::*,
11 HiDpi::*,
12 Input::{Ime::*, KeyboardAndMouse::*},
13 WindowsAndMessaging::*,
14 },
15};
16
17use crate::*;
18
19pub(crate) const CURSOR_STYLE_CHANGED: u32 = WM_USER + 1;
20pub(crate) const CLOSE_ONE_WINDOW: u32 = WM_USER + 2;
21
22const SIZE_MOVE_LOOP_TIMER_ID: usize = 1;
23const AUTO_HIDE_TASKBAR_THICKNESS_PX: i32 = 1;
24
25pub(crate) fn handle_msg(
26 handle: HWND,
27 msg: u32,
28 wparam: WPARAM,
29 lparam: LPARAM,
30 state_ptr: Rc<WindowsWindowStatePtr>,
31) -> LRESULT {
32 let handled = match msg {
33 WM_ACTIVATE => handle_activate_msg(handle, wparam, state_ptr),
34 WM_CREATE => handle_create_msg(handle, state_ptr),
35 WM_MOVE => handle_move_msg(handle, lparam, state_ptr),
36 WM_SIZE => handle_size_msg(wparam, lparam, state_ptr),
37 WM_ENTERSIZEMOVE | WM_ENTERMENULOOP => handle_size_move_loop(handle),
38 WM_EXITSIZEMOVE | WM_EXITMENULOOP => handle_size_move_loop_exit(handle),
39 WM_TIMER => handle_timer_msg(handle, wparam, state_ptr),
40 WM_NCCALCSIZE => handle_calc_client_size(handle, wparam, lparam, state_ptr),
41 WM_DPICHANGED => handle_dpi_changed_msg(handle, wparam, lparam, state_ptr),
42 WM_DISPLAYCHANGE => handle_display_change_msg(handle, state_ptr),
43 WM_NCHITTEST => handle_hit_test_msg(handle, msg, wparam, lparam, state_ptr),
44 WM_PAINT => handle_paint_msg(handle, state_ptr),
45 WM_CLOSE => handle_close_msg(state_ptr),
46 WM_DESTROY => handle_destroy_msg(handle, state_ptr),
47 WM_MOUSEMOVE => handle_mouse_move_msg(handle, lparam, wparam, state_ptr),
48 WM_MOUSELEAVE => handle_mouse_leave_msg(state_ptr),
49 WM_NCMOUSEMOVE => handle_nc_mouse_move_msg(handle, lparam, state_ptr),
50 WM_NCLBUTTONDOWN => {
51 handle_nc_mouse_down_msg(handle, MouseButton::Left, wparam, lparam, state_ptr)
52 }
53 WM_NCRBUTTONDOWN => {
54 handle_nc_mouse_down_msg(handle, MouseButton::Right, wparam, lparam, state_ptr)
55 }
56 WM_NCMBUTTONDOWN => {
57 handle_nc_mouse_down_msg(handle, MouseButton::Middle, wparam, lparam, state_ptr)
58 }
59 WM_NCLBUTTONUP => {
60 handle_nc_mouse_up_msg(handle, MouseButton::Left, wparam, lparam, state_ptr)
61 }
62 WM_NCRBUTTONUP => {
63 handle_nc_mouse_up_msg(handle, MouseButton::Right, wparam, lparam, state_ptr)
64 }
65 WM_NCMBUTTONUP => {
66 handle_nc_mouse_up_msg(handle, MouseButton::Middle, wparam, lparam, state_ptr)
67 }
68 WM_LBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Left, lparam, state_ptr),
69 WM_RBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Right, lparam, state_ptr),
70 WM_MBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Middle, lparam, state_ptr),
71 WM_XBUTTONDOWN => {
72 handle_xbutton_msg(handle, wparam, lparam, handle_mouse_down_msg, state_ptr)
73 }
74 WM_LBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Left, lparam, state_ptr),
75 WM_RBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Right, lparam, state_ptr),
76 WM_MBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Middle, lparam, state_ptr),
77 WM_XBUTTONUP => handle_xbutton_msg(handle, wparam, lparam, handle_mouse_up_msg, state_ptr),
78 WM_MOUSEWHEEL => handle_mouse_wheel_msg(handle, wparam, lparam, state_ptr),
79 WM_MOUSEHWHEEL => handle_mouse_horizontal_wheel_msg(handle, wparam, lparam, state_ptr),
80 WM_SYSKEYDOWN => handle_syskeydown_msg(wparam, lparam, state_ptr),
81 WM_SYSKEYUP => handle_syskeyup_msg(wparam, state_ptr),
82 WM_SYSCOMMAND => handle_system_command(wparam, state_ptr),
83 WM_KEYDOWN => handle_keydown_msg(wparam, lparam, state_ptr),
84 WM_KEYUP => handle_keyup_msg(wparam, state_ptr),
85 WM_CHAR => handle_char_msg(wparam, lparam, state_ptr),
86 WM_IME_STARTCOMPOSITION => handle_ime_position(handle, state_ptr),
87 WM_IME_COMPOSITION => handle_ime_composition(handle, lparam, state_ptr),
88 WM_SETCURSOR => handle_set_cursor(lparam, state_ptr),
89 WM_SETTINGCHANGE => handle_system_settings_changed(handle, state_ptr),
90 WM_DWMCOLORIZATIONCOLORCHANGED => handle_system_theme_changed(state_ptr),
91 CURSOR_STYLE_CHANGED => handle_cursor_changed(lparam, state_ptr),
92 _ => None,
93 };
94 if let Some(n) = handled {
95 LRESULT(n)
96 } else {
97 unsafe { DefWindowProcW(handle, msg, wparam, lparam) }
98 }
99}
100
101fn handle_move_msg(
102 handle: HWND,
103 lparam: LPARAM,
104 state_ptr: Rc<WindowsWindowStatePtr>,
105) -> Option<isize> {
106 let mut lock = state_ptr.state.borrow_mut();
107 let origin = logical_point(
108 lparam.signed_loword() as f32,
109 lparam.signed_hiword() as f32,
110 lock.scale_factor,
111 );
112 lock.origin = origin;
113 let size = lock.logical_size;
114 let center_x = origin.x.0 + size.width.0 / 2.;
115 let center_y = origin.y.0 + size.height.0 / 2.;
116 let monitor_bounds = lock.display.bounds();
117 if center_x < monitor_bounds.left().0
118 || center_x > monitor_bounds.right().0
119 || center_y < monitor_bounds.top().0
120 || center_y > monitor_bounds.bottom().0
121 {
122 // center of the window may have moved to another monitor
123 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
124 // minimize the window can trigger this event too, in this case,
125 // monitor is invalid, we do nothing.
126 if !monitor.is_invalid() && lock.display.handle != monitor {
127 // we will get the same monitor if we only have one
128 lock.display = WindowsDisplay::new_with_handle(monitor);
129 }
130 }
131 if let Some(mut callback) = lock.callbacks.moved.take() {
132 drop(lock);
133 callback();
134 state_ptr.state.borrow_mut().callbacks.moved = Some(callback);
135 }
136 Some(0)
137}
138
139fn handle_size_msg(
140 wparam: WPARAM,
141 lparam: LPARAM,
142 state_ptr: Rc<WindowsWindowStatePtr>,
143) -> Option<isize> {
144 if wparam.0 == SIZE_MINIMIZED as usize {
145 return Some(0);
146 }
147
148 let width = lparam.loword().max(1) as i32;
149 let height = lparam.hiword().max(1) as i32;
150 let mut lock = state_ptr.state.borrow_mut();
151 let new_size = size(DevicePixels(width), DevicePixels(height));
152 let scale_factor = lock.scale_factor;
153 lock.renderer.update_drawable_size(new_size);
154 let new_size = new_size.to_pixels(scale_factor);
155 lock.logical_size = new_size;
156 if let Some(mut callback) = lock.callbacks.resize.take() {
157 drop(lock);
158 callback(new_size, scale_factor);
159 state_ptr.state.borrow_mut().callbacks.resize = Some(callback);
160 }
161 Some(0)
162}
163
164fn handle_size_move_loop(handle: HWND) -> Option<isize> {
165 unsafe {
166 let ret = SetTimer(handle, SIZE_MOVE_LOOP_TIMER_ID, USER_TIMER_MINIMUM, None);
167 if ret == 0 {
168 log::error!(
169 "unable to create timer: {}",
170 std::io::Error::last_os_error()
171 );
172 }
173 }
174 None
175}
176
177fn handle_size_move_loop_exit(handle: HWND) -> Option<isize> {
178 unsafe {
179 KillTimer(handle, SIZE_MOVE_LOOP_TIMER_ID).log_err();
180 }
181 None
182}
183
184fn handle_timer_msg(
185 handle: HWND,
186 wparam: WPARAM,
187 state_ptr: Rc<WindowsWindowStatePtr>,
188) -> Option<isize> {
189 if wparam.0 == SIZE_MOVE_LOOP_TIMER_ID {
190 for runnable in state_ptr.main_receiver.drain() {
191 runnable.run();
192 }
193 handle_paint_msg(handle, state_ptr)
194 } else {
195 None
196 }
197}
198
199fn handle_paint_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
200 let mut lock = state_ptr.state.borrow_mut();
201 if let Some(mut request_frame) = lock.callbacks.request_frame.take() {
202 drop(lock);
203 request_frame(Default::default());
204 state_ptr.state.borrow_mut().callbacks.request_frame = Some(request_frame);
205 }
206 unsafe { ValidateRect(handle, None).ok().log_err() };
207 Some(0)
208}
209
210fn handle_close_msg(state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
211 let mut lock = state_ptr.state.borrow_mut();
212 if let Some(mut callback) = lock.callbacks.should_close.take() {
213 drop(lock);
214 let should_close = callback();
215 state_ptr.state.borrow_mut().callbacks.should_close = Some(callback);
216 if should_close {
217 None
218 } else {
219 Some(0)
220 }
221 } else {
222 None
223 }
224}
225
226fn handle_destroy_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
227 let callback = {
228 let mut lock = state_ptr.state.borrow_mut();
229 lock.callbacks.close.take()
230 };
231 if let Some(callback) = callback {
232 callback();
233 }
234 unsafe {
235 PostMessageW(
236 None,
237 CLOSE_ONE_WINDOW,
238 WPARAM(state_ptr.validation_number),
239 LPARAM(handle.0 as isize),
240 )
241 .log_err();
242 }
243 Some(0)
244}
245
246fn handle_mouse_move_msg(
247 handle: HWND,
248 lparam: LPARAM,
249 wparam: WPARAM,
250 state_ptr: Rc<WindowsWindowStatePtr>,
251) -> Option<isize> {
252 let mut lock = state_ptr.state.borrow_mut();
253 if !lock.hovered {
254 lock.hovered = true;
255 unsafe {
256 TrackMouseEvent(&mut TRACKMOUSEEVENT {
257 cbSize: std::mem::size_of::<TRACKMOUSEEVENT>() as u32,
258 dwFlags: TME_LEAVE,
259 hwndTrack: handle,
260 dwHoverTime: HOVER_DEFAULT,
261 })
262 .log_err()
263 };
264 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
265 drop(lock);
266 callback(true);
267 state_ptr.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
268 }
269 } else {
270 drop(lock);
271 }
272
273 let mut lock = state_ptr.state.borrow_mut();
274 if let Some(mut callback) = lock.callbacks.input.take() {
275 let scale_factor = lock.scale_factor;
276 drop(lock);
277 let pressed_button = match MODIFIERKEYS_FLAGS(wparam.loword() as u32) {
278 flags if flags.contains(MK_LBUTTON) => Some(MouseButton::Left),
279 flags if flags.contains(MK_RBUTTON) => Some(MouseButton::Right),
280 flags if flags.contains(MK_MBUTTON) => Some(MouseButton::Middle),
281 flags if flags.contains(MK_XBUTTON1) => {
282 Some(MouseButton::Navigate(NavigationDirection::Back))
283 }
284 flags if flags.contains(MK_XBUTTON2) => {
285 Some(MouseButton::Navigate(NavigationDirection::Forward))
286 }
287 _ => None,
288 };
289 let x = lparam.signed_loword() as f32;
290 let y = lparam.signed_hiword() as f32;
291 let event = MouseMoveEvent {
292 position: logical_point(x, y, scale_factor),
293 pressed_button,
294 modifiers: current_modifiers(),
295 };
296 let result = if callback(PlatformInput::MouseMove(event)).default_prevented {
297 Some(0)
298 } else {
299 Some(1)
300 };
301 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
302 return result;
303 }
304 Some(1)
305}
306
307fn handle_mouse_leave_msg(state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
308 let mut lock = state_ptr.state.borrow_mut();
309 lock.hovered = false;
310 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
311 drop(lock);
312 callback(false);
313 state_ptr.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
314 }
315
316 Some(0)
317}
318
319fn handle_syskeydown_msg(
320 wparam: WPARAM,
321 lparam: LPARAM,
322 state_ptr: Rc<WindowsWindowStatePtr>,
323) -> Option<isize> {
324 // we need to call `DefWindowProcW`, or we will lose the system-wide `Alt+F4`, `Alt+{other keys}`
325 // shortcuts.
326 let keystroke = parse_syskeydown_msg_keystroke(wparam)?;
327 let mut func = state_ptr.state.borrow_mut().callbacks.input.take()?;
328 let event = KeyDownEvent {
329 keystroke,
330 is_held: lparam.0 & (0x1 << 30) > 0,
331 };
332 let result = if !func(PlatformInput::KeyDown(event)).propagate {
333 state_ptr.state.borrow_mut().system_key_handled = true;
334 Some(0)
335 } else {
336 None
337 };
338 state_ptr.state.borrow_mut().callbacks.input = Some(func);
339
340 result
341}
342
343fn handle_syskeyup_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> 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 = KeyUpEvent { keystroke };
349 let result = if func(PlatformInput::KeyUp(event)).default_prevented {
350 Some(0)
351 } else {
352 Some(1)
353 };
354 state_ptr.state.borrow_mut().callbacks.input = Some(func);
355
356 result
357}
358
359fn handle_keydown_msg(
360 wparam: WPARAM,
361 lparam: LPARAM,
362 state_ptr: Rc<WindowsWindowStatePtr>,
363) -> Option<isize> {
364 let Some(keystroke_or_modifier) = parse_keydown_msg_keystroke(wparam) else {
365 return Some(1);
366 };
367 let mut lock = state_ptr.state.borrow_mut();
368 let Some(mut func) = lock.callbacks.input.take() else {
369 return Some(1);
370 };
371 drop(lock);
372
373 let event = match keystroke_or_modifier {
374 KeystrokeOrModifier::Keystroke(keystroke) => PlatformInput::KeyDown(KeyDownEvent {
375 keystroke,
376 is_held: lparam.0 & (0x1 << 30) > 0,
377 }),
378 KeystrokeOrModifier::Modifier(modifiers) => {
379 PlatformInput::ModifiersChanged(ModifiersChangedEvent { modifiers })
380 }
381 };
382
383 let result = if func(event).default_prevented {
384 Some(0)
385 } else {
386 Some(1)
387 };
388 state_ptr.state.borrow_mut().callbacks.input = Some(func);
389
390 result
391}
392
393fn handle_keyup_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
394 let Some(keystroke_or_modifier) = parse_keydown_msg_keystroke(wparam) else {
395 return Some(1);
396 };
397 let mut lock = state_ptr.state.borrow_mut();
398 let Some(mut func) = lock.callbacks.input.take() else {
399 return Some(1);
400 };
401 drop(lock);
402
403 let event = match keystroke_or_modifier {
404 KeystrokeOrModifier::Keystroke(keystroke) => PlatformInput::KeyUp(KeyUpEvent { keystroke }),
405 KeystrokeOrModifier::Modifier(modifiers) => {
406 PlatformInput::ModifiersChanged(ModifiersChangedEvent { modifiers })
407 }
408 };
409
410 let result = if func(event).default_prevented {
411 Some(0)
412 } else {
413 Some(1)
414 };
415 state_ptr.state.borrow_mut().callbacks.input = Some(func);
416
417 result
418}
419
420fn handle_char_msg(
421 wparam: WPARAM,
422 lparam: LPARAM,
423 state_ptr: Rc<WindowsWindowStatePtr>,
424) -> Option<isize> {
425 let Some(keystroke) = parse_char_msg_keystroke(wparam) else {
426 return Some(1);
427 };
428 let mut lock = state_ptr.state.borrow_mut();
429 let Some(mut func) = lock.callbacks.input.take() else {
430 return Some(1);
431 };
432 drop(lock);
433 let key_char = keystroke.key_char.clone();
434 let event = KeyDownEvent {
435 keystroke,
436 is_held: lparam.0 & (0x1 << 30) > 0,
437 };
438 let dispatch_event_result = func(PlatformInput::KeyDown(event));
439 state_ptr.state.borrow_mut().callbacks.input = Some(func);
440
441 if dispatch_event_result.default_prevented || !dispatch_event_result.propagate {
442 return Some(0);
443 }
444 let Some(ime_char) = key_char else {
445 return Some(1);
446 };
447 with_input_handler(&state_ptr, |input_handler| {
448 input_handler.replace_text_in_range(None, &ime_char);
449 });
450
451 Some(0)
452}
453
454fn handle_mouse_down_msg(
455 handle: HWND,
456 button: MouseButton,
457 lparam: LPARAM,
458 state_ptr: Rc<WindowsWindowStatePtr>,
459) -> Option<isize> {
460 unsafe { SetCapture(handle) };
461 let mut lock = state_ptr.state.borrow_mut();
462 if let Some(mut callback) = lock.callbacks.input.take() {
463 let x = lparam.signed_loword() as f32;
464 let y = lparam.signed_hiword() as f32;
465 let physical_point = point(DevicePixels(x as i32), DevicePixels(y as i32));
466 let click_count = lock.click_state.update(button, physical_point);
467 let scale_factor = lock.scale_factor;
468 drop(lock);
469
470 let event = MouseDownEvent {
471 button,
472 position: logical_point(x, y, scale_factor),
473 modifiers: current_modifiers(),
474 click_count,
475 first_mouse: false,
476 };
477 let result = if callback(PlatformInput::MouseDown(event)).default_prevented {
478 Some(0)
479 } else {
480 Some(1)
481 };
482 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
483
484 result
485 } else {
486 Some(1)
487 }
488}
489
490fn handle_mouse_up_msg(
491 _handle: HWND,
492 button: MouseButton,
493 lparam: LPARAM,
494 state_ptr: Rc<WindowsWindowStatePtr>,
495) -> Option<isize> {
496 unsafe { ReleaseCapture().log_err() };
497 let mut lock = state_ptr.state.borrow_mut();
498 if let Some(mut callback) = lock.callbacks.input.take() {
499 let x = lparam.signed_loword() as f32;
500 let y = lparam.signed_hiword() as f32;
501 let click_count = lock.click_state.current_count;
502 let scale_factor = lock.scale_factor;
503 drop(lock);
504
505 let event = MouseUpEvent {
506 button,
507 position: logical_point(x, y, scale_factor),
508 modifiers: current_modifiers(),
509 click_count,
510 };
511 let result = if callback(PlatformInput::MouseUp(event)).default_prevented {
512 Some(0)
513 } else {
514 Some(1)
515 };
516 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
517
518 result
519 } else {
520 Some(1)
521 }
522}
523
524fn handle_xbutton_msg(
525 handle: HWND,
526 wparam: WPARAM,
527 lparam: LPARAM,
528 handler: impl Fn(HWND, MouseButton, LPARAM, Rc<WindowsWindowStatePtr>) -> Option<isize>,
529 state_ptr: Rc<WindowsWindowStatePtr>,
530) -> Option<isize> {
531 let nav_dir = match wparam.hiword() {
532 XBUTTON1 => NavigationDirection::Back,
533 XBUTTON2 => NavigationDirection::Forward,
534 _ => return Some(1),
535 };
536 handler(handle, MouseButton::Navigate(nav_dir), lparam, state_ptr)
537}
538
539fn handle_mouse_wheel_msg(
540 handle: HWND,
541 wparam: WPARAM,
542 lparam: LPARAM,
543 state_ptr: Rc<WindowsWindowStatePtr>,
544) -> Option<isize> {
545 let modifiers = current_modifiers();
546 let mut lock = state_ptr.state.borrow_mut();
547 if let Some(mut callback) = lock.callbacks.input.take() {
548 let scale_factor = lock.scale_factor;
549 let wheel_scroll_amount = match modifiers.shift {
550 true => lock.system_settings.mouse_wheel_settings.wheel_scroll_chars,
551 false => lock.system_settings.mouse_wheel_settings.wheel_scroll_lines,
552 };
553 drop(lock);
554 let wheel_distance =
555 (wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_amount as f32;
556 let mut cursor_point = POINT {
557 x: lparam.signed_loword().into(),
558 y: lparam.signed_hiword().into(),
559 };
560 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
561 let event = ScrollWheelEvent {
562 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
563 delta: ScrollDelta::Lines(match modifiers.shift {
564 true => Point {
565 x: wheel_distance,
566 y: 0.0,
567 },
568 false => Point {
569 y: wheel_distance,
570 x: 0.0,
571 },
572 }),
573 modifiers: current_modifiers(),
574 touch_phase: TouchPhase::Moved,
575 };
576 let result = if callback(PlatformInput::ScrollWheel(event)).default_prevented {
577 Some(0)
578 } else {
579 Some(1)
580 };
581 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
582
583 result
584 } else {
585 Some(1)
586 }
587}
588
589fn handle_mouse_horizontal_wheel_msg(
590 handle: HWND,
591 wparam: WPARAM,
592 lparam: LPARAM,
593 state_ptr: Rc<WindowsWindowStatePtr>,
594) -> Option<isize> {
595 let mut lock = state_ptr.state.borrow_mut();
596 if let Some(mut callback) = lock.callbacks.input.take() {
597 let scale_factor = lock.scale_factor;
598 let wheel_scroll_chars = lock.system_settings.mouse_wheel_settings.wheel_scroll_chars;
599 drop(lock);
600 let wheel_distance =
601 (-wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_chars as f32;
602 let mut cursor_point = POINT {
603 x: lparam.signed_loword().into(),
604 y: lparam.signed_hiword().into(),
605 };
606 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
607 let event = ScrollWheelEvent {
608 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
609 delta: ScrollDelta::Lines(Point {
610 x: wheel_distance,
611 y: 0.0,
612 }),
613 modifiers: current_modifiers(),
614 touch_phase: TouchPhase::Moved,
615 };
616 let result = if callback(PlatformInput::ScrollWheel(event)).default_prevented {
617 Some(0)
618 } else {
619 Some(1)
620 };
621 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
622
623 result
624 } else {
625 Some(1)
626 }
627}
628
629fn retrieve_caret_position(state_ptr: &Rc<WindowsWindowStatePtr>) -> Option<POINT> {
630 with_input_handler_and_scale_factor(state_ptr, |input_handler, scale_factor| {
631 let caret_range = input_handler.selected_text_range(false)?;
632 let caret_position = input_handler.bounds_for_range(caret_range.range)?;
633 Some(POINT {
634 // logical to physical
635 x: (caret_position.origin.x.0 * scale_factor) as i32,
636 y: (caret_position.origin.y.0 * scale_factor) as i32
637 + ((caret_position.size.height.0 * scale_factor) as i32 / 2),
638 })
639 })
640}
641
642fn handle_ime_position(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
643 unsafe {
644 let ctx = ImmGetContext(handle);
645
646 let Some(caret_position) = retrieve_caret_position(&state_ptr) else {
647 return Some(0);
648 };
649 {
650 let config = COMPOSITIONFORM {
651 dwStyle: CFS_POINT,
652 ptCurrentPos: caret_position,
653 ..Default::default()
654 };
655 ImmSetCompositionWindow(ctx, &config as _).ok().log_err();
656 }
657 {
658 let config = CANDIDATEFORM {
659 dwStyle: CFS_CANDIDATEPOS,
660 ptCurrentPos: caret_position,
661 ..Default::default()
662 };
663 ImmSetCandidateWindow(ctx, &config as _).ok().log_err();
664 }
665 ImmReleaseContext(handle, ctx).ok().log_err();
666 Some(0)
667 }
668}
669
670fn handle_ime_composition(
671 handle: HWND,
672 lparam: LPARAM,
673 state_ptr: Rc<WindowsWindowStatePtr>,
674) -> Option<isize> {
675 let ctx = unsafe { ImmGetContext(handle) };
676 let result = handle_ime_composition_inner(ctx, lparam, state_ptr);
677 unsafe { ImmReleaseContext(handle, ctx).ok().log_err() };
678 result
679}
680
681fn handle_ime_composition_inner(
682 ctx: HIMC,
683 lparam: LPARAM,
684 state_ptr: Rc<WindowsWindowStatePtr>,
685) -> Option<isize> {
686 let mut ime_input = None;
687 if lparam.0 as u32 & GCS_COMPSTR.0 > 0 {
688 let (comp_string, string_len) = parse_ime_compostion_string(ctx)?;
689 with_input_handler(&state_ptr, |input_handler| {
690 input_handler.replace_and_mark_text_in_range(
691 None,
692 &comp_string,
693 Some(string_len..string_len),
694 );
695 })?;
696 ime_input = Some(comp_string);
697 }
698 if lparam.0 as u32 & GCS_CURSORPOS.0 > 0 {
699 let comp_string = &ime_input?;
700 let caret_pos = retrieve_composition_cursor_position(ctx);
701 with_input_handler(&state_ptr, |input_handler| {
702 input_handler.replace_and_mark_text_in_range(
703 None,
704 comp_string,
705 Some(caret_pos..caret_pos),
706 );
707 })?;
708 }
709 if lparam.0 as u32 & GCS_RESULTSTR.0 > 0 {
710 let comp_result = parse_ime_compostion_result(ctx)?;
711 with_input_handler(&state_ptr, |input_handler| {
712 input_handler.replace_text_in_range(None, &comp_result);
713 })?;
714 return Some(0);
715 }
716 // currently, we don't care other stuff
717 None
718}
719
720/// SEE: https://learn.microsoft.com/en-us/windows/win32/winmsg/wm-nccalcsize
721fn handle_calc_client_size(
722 handle: HWND,
723 wparam: WPARAM,
724 lparam: LPARAM,
725 state_ptr: Rc<WindowsWindowStatePtr>,
726) -> Option<isize> {
727 if !state_ptr.hide_title_bar || state_ptr.state.borrow().is_fullscreen() || wparam.0 == 0 {
728 return None;
729 }
730
731 let is_maximized = state_ptr.state.borrow().is_maximized();
732 let insets = get_client_area_insets(handle, is_maximized, state_ptr.windows_version);
733 // wparam is TRUE so lparam points to an NCCALCSIZE_PARAMS structure
734 let mut params = lparam.0 as *mut NCCALCSIZE_PARAMS;
735 let mut requested_client_rect = unsafe { &mut ((*params).rgrc) };
736
737 requested_client_rect[0].left += insets.left;
738 requested_client_rect[0].top += insets.top;
739 requested_client_rect[0].right -= insets.right;
740 requested_client_rect[0].bottom -= insets.bottom;
741
742 // Fix auto hide taskbar not showing. This solution is based on the approach
743 // used by Chrome. However, it may result in one row of pixels being obscured
744 // in our client area. But as Chrome says, "there seems to be no better solution."
745 if is_maximized {
746 if let Some(ref taskbar_position) = state_ptr
747 .state
748 .borrow()
749 .system_settings
750 .auto_hide_taskbar_position
751 {
752 // Fot the auto-hide taskbar, adjust in by 1 pixel on taskbar edge,
753 // so the window isn't treated as a "fullscreen app", which would cause
754 // the taskbar to disappear.
755 match taskbar_position {
756 AutoHideTaskbarPosition::Left => {
757 requested_client_rect[0].left += AUTO_HIDE_TASKBAR_THICKNESS_PX
758 }
759 AutoHideTaskbarPosition::Top => {
760 requested_client_rect[0].top += AUTO_HIDE_TASKBAR_THICKNESS_PX
761 }
762 AutoHideTaskbarPosition::Right => {
763 requested_client_rect[0].right -= AUTO_HIDE_TASKBAR_THICKNESS_PX
764 }
765 AutoHideTaskbarPosition::Bottom => {
766 requested_client_rect[0].bottom -= AUTO_HIDE_TASKBAR_THICKNESS_PX
767 }
768 }
769 }
770 }
771
772 Some(0)
773}
774
775fn handle_activate_msg(
776 handle: HWND,
777 wparam: WPARAM,
778 state_ptr: Rc<WindowsWindowStatePtr>,
779) -> Option<isize> {
780 let activated = wparam.loword() > 0;
781 if state_ptr.hide_title_bar {
782 if let Some(titlebar_rect) = state_ptr.state.borrow().get_titlebar_rect().log_err() {
783 unsafe {
784 InvalidateRect(handle, Some(&titlebar_rect), FALSE)
785 .ok()
786 .log_err()
787 };
788 }
789 }
790 let this = state_ptr.clone();
791 state_ptr
792 .executor
793 .spawn(async move {
794 let mut lock = this.state.borrow_mut();
795 if let Some(mut cb) = lock.callbacks.active_status_change.take() {
796 drop(lock);
797 cb(activated);
798 this.state.borrow_mut().callbacks.active_status_change = Some(cb);
799 }
800 })
801 .detach();
802
803 None
804}
805
806fn handle_create_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
807 if state_ptr.hide_title_bar {
808 notify_frame_changed(handle);
809 Some(0)
810 } else {
811 None
812 }
813}
814
815fn handle_dpi_changed_msg(
816 handle: HWND,
817 wparam: WPARAM,
818 lparam: LPARAM,
819 state_ptr: Rc<WindowsWindowStatePtr>,
820) -> Option<isize> {
821 let new_dpi = wparam.loword() as f32;
822 let mut lock = state_ptr.state.borrow_mut();
823 lock.scale_factor = new_dpi / USER_DEFAULT_SCREEN_DPI as f32;
824 lock.border_offset.update(handle).log_err();
825 drop(lock);
826
827 let rect = unsafe { &*(lparam.0 as *const RECT) };
828 let width = rect.right - rect.left;
829 let height = rect.bottom - rect.top;
830 // this will emit `WM_SIZE` and `WM_MOVE` right here
831 // even before this function returns
832 // the new size is handled in `WM_SIZE`
833 unsafe {
834 SetWindowPos(
835 handle,
836 None,
837 rect.left,
838 rect.top,
839 width,
840 height,
841 SWP_NOZORDER | SWP_NOACTIVATE,
842 )
843 .context("unable to set window position after dpi has changed")
844 .log_err();
845 }
846
847 Some(0)
848}
849
850/// The following conditions will trigger this event:
851/// 1. The monitor on which the window is located goes offline or changes resolution.
852/// 2. Another monitor goes offline, is plugged in, or changes resolution.
853///
854/// In either case, the window will only receive information from the monitor on which
855/// it is located.
856///
857/// For example, in the case of condition 2, where the monitor on which the window is
858/// located has actually changed nothing, it will still receive this event.
859fn handle_display_change_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
860 // NOTE:
861 // Even the `lParam` holds the resolution of the screen, we just ignore it.
862 // Because WM_DPICHANGED, WM_MOVE, WM_SIZE will come first, window reposition and resize
863 // are handled there.
864 // So we only care about if monitor is disconnected.
865 let previous_monitor = state_ptr.as_ref().state.borrow().display;
866 if WindowsDisplay::is_connected(previous_monitor.handle) {
867 // we are fine, other display changed
868 return None;
869 }
870 // display disconnected
871 // in this case, the OS will move our window to another monitor, and minimize it.
872 // we deminimize the window and query the monitor after moving
873 unsafe {
874 let _ = ShowWindow(handle, SW_SHOWNORMAL);
875 };
876 let new_monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
877 // all monitors disconnected
878 if new_monitor.is_invalid() {
879 log::error!("No monitor detected!");
880 return None;
881 }
882 let new_display = WindowsDisplay::new_with_handle(new_monitor);
883 state_ptr.as_ref().state.borrow_mut().display = new_display;
884 Some(0)
885}
886
887fn handle_hit_test_msg(
888 handle: HWND,
889 msg: u32,
890 wparam: WPARAM,
891 lparam: LPARAM,
892 state_ptr: Rc<WindowsWindowStatePtr>,
893) -> Option<isize> {
894 if !state_ptr.is_movable {
895 return None;
896 }
897 if !state_ptr.hide_title_bar {
898 return None;
899 }
900
901 // default handler for resize areas
902 let hit = unsafe { DefWindowProcW(handle, msg, wparam, lparam) };
903 if matches!(
904 hit.0 as u32,
905 HTNOWHERE
906 | HTRIGHT
907 | HTLEFT
908 | HTTOPLEFT
909 | HTTOP
910 | HTTOPRIGHT
911 | HTBOTTOMRIGHT
912 | HTBOTTOM
913 | HTBOTTOMLEFT
914 ) {
915 return Some(hit.0);
916 }
917
918 if state_ptr.state.borrow().is_fullscreen() {
919 return Some(HTCLIENT as _);
920 }
921
922 let dpi = unsafe { GetDpiForWindow(handle) };
923 let frame_y = unsafe { GetSystemMetricsForDpi(SM_CYFRAME, dpi) };
924
925 let mut cursor_point = POINT {
926 x: lparam.signed_loword().into(),
927 y: lparam.signed_hiword().into(),
928 };
929 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
930 if !state_ptr.state.borrow().is_maximized() && cursor_point.y >= 0 && cursor_point.y <= frame_y
931 {
932 return Some(HTTOP as _);
933 }
934
935 let titlebar_rect = state_ptr.state.borrow().get_titlebar_rect();
936 if let Ok(titlebar_rect) = titlebar_rect {
937 if cursor_point.y < titlebar_rect.bottom {
938 let caption_btn_width = (state_ptr.state.borrow().caption_button_width().0
939 * state_ptr.state.borrow().scale_factor) as i32;
940 if cursor_point.x >= titlebar_rect.right - caption_btn_width {
941 return Some(HTCLOSE as _);
942 } else if cursor_point.x >= titlebar_rect.right - caption_btn_width * 2 {
943 return Some(HTMAXBUTTON as _);
944 } else if cursor_point.x >= titlebar_rect.right - caption_btn_width * 3 {
945 return Some(HTMINBUTTON as _);
946 }
947
948 return Some(HTCAPTION as _);
949 }
950 }
951
952 Some(HTCLIENT as _)
953}
954
955fn handle_nc_mouse_move_msg(
956 handle: HWND,
957 lparam: LPARAM,
958 state_ptr: Rc<WindowsWindowStatePtr>,
959) -> Option<isize> {
960 if !state_ptr.hide_title_bar {
961 return None;
962 }
963
964 let mut lock = state_ptr.state.borrow_mut();
965 if let Some(mut callback) = lock.callbacks.input.take() {
966 let scale_factor = lock.scale_factor;
967 drop(lock);
968 let mut cursor_point = POINT {
969 x: lparam.signed_loword().into(),
970 y: lparam.signed_hiword().into(),
971 };
972 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
973 let event = MouseMoveEvent {
974 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
975 pressed_button: None,
976 modifiers: current_modifiers(),
977 };
978 let result = if callback(PlatformInput::MouseMove(event)).default_prevented {
979 Some(0)
980 } else {
981 Some(1)
982 };
983 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
984
985 result
986 } else {
987 None
988 }
989}
990
991fn handle_nc_mouse_down_msg(
992 handle: HWND,
993 button: MouseButton,
994 wparam: WPARAM,
995 lparam: LPARAM,
996 state_ptr: Rc<WindowsWindowStatePtr>,
997) -> Option<isize> {
998 if !state_ptr.hide_title_bar {
999 return None;
1000 }
1001
1002 let mut lock = state_ptr.state.borrow_mut();
1003 if let Some(mut callback) = lock.callbacks.input.take() {
1004 let scale_factor = lock.scale_factor;
1005 let mut cursor_point = POINT {
1006 x: lparam.signed_loword().into(),
1007 y: lparam.signed_hiword().into(),
1008 };
1009 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1010 let physical_point = point(DevicePixels(cursor_point.x), DevicePixels(cursor_point.y));
1011 let click_count = lock.click_state.update(button, physical_point);
1012 drop(lock);
1013 let event = MouseDownEvent {
1014 button,
1015 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1016 modifiers: current_modifiers(),
1017 click_count,
1018 first_mouse: false,
1019 };
1020 let result = if callback(PlatformInput::MouseDown(event)).default_prevented {
1021 Some(0)
1022 } else {
1023 None
1024 };
1025 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
1026
1027 if result.is_some() {
1028 return result;
1029 }
1030 } else {
1031 drop(lock);
1032 };
1033
1034 // Since these are handled in handle_nc_mouse_up_msg we must prevent the default window proc
1035 if button == MouseButton::Left {
1036 match wparam.0 as u32 {
1037 HTMINBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMINBUTTON),
1038 HTMAXBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMAXBUTTON),
1039 HTCLOSE => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTCLOSE),
1040 _ => return None,
1041 };
1042 Some(0)
1043 } else {
1044 None
1045 }
1046}
1047
1048fn handle_nc_mouse_up_msg(
1049 handle: HWND,
1050 button: MouseButton,
1051 wparam: WPARAM,
1052 lparam: LPARAM,
1053 state_ptr: Rc<WindowsWindowStatePtr>,
1054) -> Option<isize> {
1055 if !state_ptr.hide_title_bar {
1056 return None;
1057 }
1058
1059 let mut lock = state_ptr.state.borrow_mut();
1060 if let Some(mut callback) = lock.callbacks.input.take() {
1061 let scale_factor = lock.scale_factor;
1062 drop(lock);
1063 let mut cursor_point = POINT {
1064 x: lparam.signed_loword().into(),
1065 y: lparam.signed_hiword().into(),
1066 };
1067 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1068 let event = MouseUpEvent {
1069 button,
1070 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1071 modifiers: current_modifiers(),
1072 click_count: 1,
1073 };
1074 let result = if callback(PlatformInput::MouseUp(event)).default_prevented {
1075 Some(0)
1076 } else {
1077 None
1078 };
1079 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
1080 if result.is_some() {
1081 return result;
1082 }
1083 } else {
1084 drop(lock);
1085 }
1086
1087 let last_pressed = state_ptr.state.borrow_mut().nc_button_pressed.take();
1088 if button == MouseButton::Left && last_pressed.is_some() {
1089 let last_button = last_pressed.unwrap();
1090 let mut handled = false;
1091 match wparam.0 as u32 {
1092 HTMINBUTTON => {
1093 if last_button == HTMINBUTTON {
1094 unsafe { ShowWindowAsync(handle, SW_MINIMIZE).ok().log_err() };
1095 handled = true;
1096 }
1097 }
1098 HTMAXBUTTON => {
1099 if last_button == 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 handled = true;
1106 }
1107 }
1108 HTCLOSE => {
1109 if last_button == HTCLOSE {
1110 unsafe {
1111 PostMessageW(handle, WM_CLOSE, WPARAM::default(), LPARAM::default())
1112 .log_err()
1113 };
1114 handled = true;
1115 }
1116 }
1117 _ => {}
1118 };
1119 if handled {
1120 return Some(0);
1121 }
1122 }
1123
1124 None
1125}
1126
1127fn handle_cursor_changed(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1128 state_ptr.state.borrow_mut().current_cursor = HCURSOR(lparam.0 as _);
1129 Some(0)
1130}
1131
1132fn handle_set_cursor(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1133 if matches!(
1134 lparam.loword() as u32,
1135 HTLEFT | HTRIGHT | HTTOP | HTTOPLEFT | HTTOPRIGHT | HTBOTTOM | HTBOTTOMLEFT | HTBOTTOMRIGHT
1136 ) {
1137 return None;
1138 }
1139 unsafe { SetCursor(state_ptr.state.borrow().current_cursor) };
1140 Some(1)
1141}
1142
1143fn handle_system_settings_changed(
1144 handle: HWND,
1145 state_ptr: Rc<WindowsWindowStatePtr>,
1146) -> Option<isize> {
1147 let mut lock = state_ptr.state.borrow_mut();
1148 let display = lock.display;
1149 // system settings
1150 lock.system_settings.update(display);
1151 // mouse double click
1152 lock.click_state.system_update();
1153 // window border offset
1154 lock.border_offset.update(handle).log_err();
1155 drop(lock);
1156 // Force to trigger WM_NCCALCSIZE event to ensure that we handle auto hide
1157 // taskbar correctly.
1158 notify_frame_changed(handle);
1159 Some(0)
1160}
1161
1162fn handle_system_command(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1163 if wparam.0 == SC_KEYMENU as usize {
1164 let mut lock = state_ptr.state.borrow_mut();
1165 if lock.system_key_handled {
1166 lock.system_key_handled = false;
1167 return Some(0);
1168 }
1169 }
1170 None
1171}
1172
1173fn handle_system_theme_changed(state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1174 let mut callback = state_ptr
1175 .state
1176 .borrow_mut()
1177 .callbacks
1178 .appearance_changed
1179 .take()?;
1180 callback();
1181 state_ptr.state.borrow_mut().callbacks.appearance_changed = Some(callback);
1182 Some(0)
1183}
1184
1185fn parse_syskeydown_msg_keystroke(wparam: WPARAM) -> Option<Keystroke> {
1186 let modifiers = current_modifiers();
1187 if !modifiers.alt {
1188 // on Windows, F10 can trigger this event, not just the alt key
1189 // and we just don't care about F10
1190 return None;
1191 }
1192
1193 let vk_code = wparam.loword();
1194
1195 let key = match VIRTUAL_KEY(vk_code) {
1196 VK_BACK => "backspace",
1197 VK_RETURN => "enter",
1198 VK_TAB => "tab",
1199 VK_UP => "up",
1200 VK_DOWN => "down",
1201 VK_RIGHT => "right",
1202 VK_LEFT => "left",
1203 VK_HOME => "home",
1204 VK_END => "end",
1205 VK_PRIOR => "pageup",
1206 VK_NEXT => "pagedown",
1207 VK_BROWSER_BACK => "back",
1208 VK_BROWSER_FORWARD => "forward",
1209 VK_ESCAPE => "escape",
1210 VK_INSERT => "insert",
1211 VK_DELETE => "delete",
1212 _ => return basic_vkcode_to_string(vk_code, modifiers),
1213 }
1214 .to_owned();
1215
1216 Some(Keystroke {
1217 modifiers,
1218 key,
1219 key_char: None,
1220 })
1221}
1222
1223enum KeystrokeOrModifier {
1224 Keystroke(Keystroke),
1225 Modifier(Modifiers),
1226}
1227
1228fn parse_keydown_msg_keystroke(wparam: WPARAM) -> Option<KeystrokeOrModifier> {
1229 let vk_code = wparam.loword();
1230
1231 let modifiers = current_modifiers();
1232
1233 let key = match VIRTUAL_KEY(vk_code) {
1234 VK_BACK => "backspace",
1235 VK_RETURN => "enter",
1236 VK_TAB => "tab",
1237 VK_UP => "up",
1238 VK_DOWN => "down",
1239 VK_RIGHT => "right",
1240 VK_LEFT => "left",
1241 VK_HOME => "home",
1242 VK_END => "end",
1243 VK_PRIOR => "pageup",
1244 VK_NEXT => "pagedown",
1245 VK_BROWSER_BACK => "back",
1246 VK_BROWSER_FORWARD => "forward",
1247 VK_ESCAPE => "escape",
1248 VK_INSERT => "insert",
1249 VK_DELETE => "delete",
1250 _ => {
1251 if is_modifier(VIRTUAL_KEY(vk_code)) {
1252 return Some(KeystrokeOrModifier::Modifier(modifiers));
1253 }
1254
1255 if modifiers.control || modifiers.alt {
1256 let basic_key = basic_vkcode_to_string(vk_code, modifiers);
1257 if let Some(basic_key) = basic_key {
1258 return Some(KeystrokeOrModifier::Keystroke(basic_key));
1259 }
1260 }
1261
1262 if vk_code >= VK_F1.0 && vk_code <= VK_F24.0 {
1263 let offset = vk_code - VK_F1.0;
1264 return Some(KeystrokeOrModifier::Keystroke(Keystroke {
1265 modifiers,
1266 key: format!("f{}", offset + 1),
1267 key_char: None,
1268 }));
1269 };
1270 return None;
1271 }
1272 }
1273 .to_owned();
1274
1275 Some(KeystrokeOrModifier::Keystroke(Keystroke {
1276 modifiers,
1277 key,
1278 key_char: None,
1279 }))
1280}
1281
1282fn parse_char_msg_keystroke(wparam: WPARAM) -> Option<Keystroke> {
1283 let first_char = char::from_u32((wparam.0 as u16).into())?;
1284 if first_char.is_control() {
1285 None
1286 } else {
1287 let mut modifiers = current_modifiers();
1288 // for characters that use 'shift' to type it is expected that the
1289 // shift is not reported if the uppercase/lowercase are the same and instead only the key is reported
1290 if first_char.to_ascii_uppercase() == first_char.to_ascii_lowercase() {
1291 modifiers.shift = false;
1292 }
1293 let key = match first_char {
1294 ' ' => "space".to_string(),
1295 first_char => first_char.to_lowercase().to_string(),
1296 };
1297 Some(Keystroke {
1298 modifiers,
1299 key,
1300 key_char: Some(first_char.to_string()),
1301 })
1302 }
1303}
1304
1305fn parse_ime_compostion_string(ctx: HIMC) -> Option<(String, usize)> {
1306 unsafe {
1307 let string_len = ImmGetCompositionStringW(ctx, GCS_COMPSTR, None, 0);
1308 if string_len >= 0 {
1309 let mut buffer = vec![0u8; string_len as usize + 2];
1310 ImmGetCompositionStringW(
1311 ctx,
1312 GCS_COMPSTR,
1313 Some(buffer.as_mut_ptr() as _),
1314 string_len as _,
1315 );
1316 let wstring = std::slice::from_raw_parts::<u16>(
1317 buffer.as_mut_ptr().cast::<u16>(),
1318 string_len as usize / 2,
1319 );
1320 let string = String::from_utf16_lossy(wstring);
1321 Some((string, string_len as usize / 2))
1322 } else {
1323 None
1324 }
1325 }
1326}
1327
1328#[inline]
1329fn retrieve_composition_cursor_position(ctx: HIMC) -> usize {
1330 unsafe { ImmGetCompositionStringW(ctx, GCS_CURSORPOS, None, 0) as usize }
1331}
1332
1333fn parse_ime_compostion_result(ctx: HIMC) -> Option<String> {
1334 unsafe {
1335 let string_len = ImmGetCompositionStringW(ctx, GCS_RESULTSTR, None, 0);
1336 if string_len >= 0 {
1337 let mut buffer = vec![0u8; string_len as usize + 2];
1338 ImmGetCompositionStringW(
1339 ctx,
1340 GCS_RESULTSTR,
1341 Some(buffer.as_mut_ptr() as _),
1342 string_len as _,
1343 );
1344 let wstring = std::slice::from_raw_parts::<u16>(
1345 buffer.as_mut_ptr().cast::<u16>(),
1346 string_len as usize / 2,
1347 );
1348 let string = String::from_utf16_lossy(wstring);
1349 Some(string)
1350 } else {
1351 None
1352 }
1353 }
1354}
1355
1356fn basic_vkcode_to_string(code: u16, modifiers: Modifiers) -> Option<Keystroke> {
1357 let mapped_code = unsafe { MapVirtualKeyW(code as u32, MAPVK_VK_TO_CHAR) };
1358
1359 let key = match mapped_code {
1360 0 => None,
1361 raw_code => char::from_u32(raw_code),
1362 }?
1363 .to_ascii_lowercase();
1364
1365 let key = if matches!(code as u32, 112..=135) {
1366 format!("f{key}")
1367 } else {
1368 key.to_string()
1369 };
1370
1371 Some(Keystroke {
1372 modifiers,
1373 key,
1374 key_char: None,
1375 })
1376}
1377
1378#[inline]
1379fn is_virtual_key_pressed(vkey: VIRTUAL_KEY) -> bool {
1380 unsafe { GetKeyState(vkey.0 as i32) < 0 }
1381}
1382
1383fn is_modifier(virtual_key: VIRTUAL_KEY) -> bool {
1384 matches!(
1385 virtual_key,
1386 VK_CONTROL | VK_MENU | VK_SHIFT | VK_LWIN | VK_RWIN
1387 )
1388}
1389
1390#[inline]
1391pub(crate) fn current_modifiers() -> Modifiers {
1392 Modifiers {
1393 control: is_virtual_key_pressed(VK_CONTROL),
1394 alt: is_virtual_key_pressed(VK_MENU),
1395 shift: is_virtual_key_pressed(VK_SHIFT),
1396 platform: is_virtual_key_pressed(VK_LWIN) || is_virtual_key_pressed(VK_RWIN),
1397 function: false,
1398 }
1399}
1400
1401fn get_client_area_insets(
1402 handle: HWND,
1403 is_maximized: bool,
1404 windows_version: WindowsVersion,
1405) -> RECT {
1406 // For maximized windows, Windows outdents the window rect from the screen's client rect
1407 // by `frame_thickness` on each edge, meaning `insets` must contain `frame_thickness`
1408 // on all sides (including the top) to avoid the client area extending onto adjacent
1409 // monitors.
1410 //
1411 // For non-maximized windows, things become complicated:
1412 //
1413 // - On Windows 10
1414 // The top inset must be zero, since if there is any nonclient area, Windows will draw
1415 // a full native titlebar outside the client area. (This doesn't occur in the maximized
1416 // case.)
1417 //
1418 // - On Windows 11
1419 // The top inset is calculated using an empirical formula that I derived through various
1420 // tests. Without this, the top 1-2 rows of pixels in our window would be obscured.
1421 let dpi = unsafe { GetDpiForWindow(handle) };
1422 let frame_thickness = get_frame_thickness(dpi);
1423 let top_insets = if is_maximized {
1424 frame_thickness
1425 } else {
1426 match windows_version {
1427 WindowsVersion::Win10 => 0,
1428 WindowsVersion::Win11 => (dpi as f32 / USER_DEFAULT_SCREEN_DPI as f32).round() as i32,
1429 }
1430 };
1431 RECT {
1432 left: frame_thickness,
1433 top: top_insets,
1434 right: frame_thickness,
1435 bottom: frame_thickness,
1436 }
1437}
1438
1439// there is some additional non-visible space when talking about window
1440// borders on Windows:
1441// - SM_CXSIZEFRAME: The resize handle.
1442// - SM_CXPADDEDBORDER: Additional border space that isn't part of the resize handle.
1443fn get_frame_thickness(dpi: u32) -> i32 {
1444 let resize_frame_thickness = unsafe { GetSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) };
1445 let padding_thickness = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
1446 resize_frame_thickness + padding_thickness
1447}
1448
1449fn notify_frame_changed(handle: HWND) {
1450 unsafe {
1451 SetWindowPos(
1452 handle,
1453 None,
1454 0,
1455 0,
1456 0,
1457 0,
1458 SWP_FRAMECHANGED
1459 | SWP_NOACTIVATE
1460 | SWP_NOCOPYBITS
1461 | SWP_NOMOVE
1462 | SWP_NOOWNERZORDER
1463 | SWP_NOREPOSITION
1464 | SWP_NOSENDCHANGING
1465 | SWP_NOSIZE
1466 | SWP_NOZORDER,
1467 )
1468 .log_err();
1469 }
1470}
1471
1472fn with_input_handler<F, R>(state_ptr: &Rc<WindowsWindowStatePtr>, f: F) -> Option<R>
1473where
1474 F: FnOnce(&mut PlatformInputHandler) -> R,
1475{
1476 let mut input_handler = state_ptr.state.borrow_mut().input_handler.take()?;
1477 let result = f(&mut input_handler);
1478 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
1479 Some(result)
1480}
1481
1482fn with_input_handler_and_scale_factor<F, R>(
1483 state_ptr: &Rc<WindowsWindowStatePtr>,
1484 f: F,
1485) -> Option<R>
1486where
1487 F: FnOnce(&mut PlatformInputHandler, f32) -> Option<R>,
1488{
1489 let mut lock = state_ptr.state.borrow_mut();
1490 let mut input_handler = lock.input_handler.take()?;
1491 let scale_factor = lock.scale_factor;
1492 drop(lock);
1493 let result = f(&mut input_handler, scale_factor);
1494 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
1495 result
1496}