1use std::rc::Rc;
2
3use ::util::ResultExt;
4use anyhow::Context as _;
5use windows::{
6 core::PCWSTR,
7 Win32::{
8 Foundation::*,
9 Graphics::Gdi::*,
10 System::SystemServices::*,
11 UI::{
12 Controls::*,
13 HiDpi::*,
14 Input::{Ime::*, KeyboardAndMouse::*},
15 WindowsAndMessaging::*,
16 },
17 },
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_ENTERSIZEMOVE | WM_ENTERMENULOOP => handle_size_move_loop(handle),
43 WM_EXITSIZEMOVE | WM_EXITMENULOOP => handle_size_move_loop_exit(handle),
44 WM_TIMER => handle_timer_msg(handle, wparam, state_ptr),
45 WM_NCCALCSIZE => handle_calc_client_size(handle, wparam, lparam, state_ptr),
46 WM_DPICHANGED => handle_dpi_changed_msg(handle, wparam, lparam, state_ptr),
47 WM_DISPLAYCHANGE => handle_display_change_msg(handle, state_ptr),
48 WM_NCHITTEST => handle_hit_test_msg(handle, msg, wparam, lparam, state_ptr),
49 WM_PAINT => handle_paint_msg(handle, state_ptr),
50 WM_CLOSE => handle_close_msg(state_ptr),
51 WM_DESTROY => handle_destroy_msg(handle, state_ptr),
52 WM_MOUSEMOVE => handle_mouse_move_msg(handle, lparam, wparam, state_ptr),
53 WM_MOUSELEAVE | WM_NCMOUSELEAVE => handle_mouse_leave_msg(state_ptr),
54 WM_NCMOUSEMOVE => handle_nc_mouse_move_msg(handle, lparam, state_ptr),
55 WM_NCLBUTTONDOWN => {
56 handle_nc_mouse_down_msg(handle, MouseButton::Left, wparam, lparam, state_ptr)
57 }
58 WM_NCRBUTTONDOWN => {
59 handle_nc_mouse_down_msg(handle, MouseButton::Right, wparam, lparam, state_ptr)
60 }
61 WM_NCMBUTTONDOWN => {
62 handle_nc_mouse_down_msg(handle, MouseButton::Middle, wparam, lparam, state_ptr)
63 }
64 WM_NCLBUTTONUP => {
65 handle_nc_mouse_up_msg(handle, MouseButton::Left, wparam, lparam, state_ptr)
66 }
67 WM_NCRBUTTONUP => {
68 handle_nc_mouse_up_msg(handle, MouseButton::Right, wparam, lparam, state_ptr)
69 }
70 WM_NCMBUTTONUP => {
71 handle_nc_mouse_up_msg(handle, MouseButton::Middle, wparam, lparam, state_ptr)
72 }
73 WM_LBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Left, lparam, state_ptr),
74 WM_RBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Right, lparam, state_ptr),
75 WM_MBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Middle, lparam, state_ptr),
76 WM_XBUTTONDOWN => {
77 handle_xbutton_msg(handle, wparam, lparam, handle_mouse_down_msg, state_ptr)
78 }
79 WM_LBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Left, lparam, state_ptr),
80 WM_RBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Right, lparam, state_ptr),
81 WM_MBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Middle, lparam, state_ptr),
82 WM_XBUTTONUP => handle_xbutton_msg(handle, wparam, lparam, handle_mouse_up_msg, state_ptr),
83 WM_MOUSEWHEEL => handle_mouse_wheel_msg(handle, wparam, lparam, state_ptr),
84 WM_MOUSEHWHEEL => handle_mouse_horizontal_wheel_msg(handle, wparam, lparam, state_ptr),
85 WM_SYSKEYDOWN => handle_syskeydown_msg(wparam, lparam, state_ptr),
86 WM_SYSKEYUP => handle_syskeyup_msg(wparam, state_ptr),
87 WM_SYSCOMMAND => handle_system_command(wparam, state_ptr),
88 WM_KEYDOWN => handle_keydown_msg(wparam, lparam, state_ptr),
89 WM_KEYUP => handle_keyup_msg(wparam, state_ptr),
90 WM_CHAR => handle_char_msg(wparam, lparam, state_ptr),
91 WM_IME_STARTCOMPOSITION => handle_ime_position(handle, state_ptr),
92 WM_IME_COMPOSITION => handle_ime_composition(handle, lparam, state_ptr),
93 WM_SETCURSOR => handle_set_cursor(lparam, state_ptr),
94 WM_SETTINGCHANGE => handle_system_settings_changed(handle, lparam, state_ptr),
95 WM_GPUI_CURSOR_STYLE_CHANGED => handle_cursor_changed(lparam, state_ptr),
96 _ => None,
97 };
98 if let Some(n) = handled {
99 LRESULT(n)
100 } else {
101 unsafe { DefWindowProcW(handle, msg, wparam, lparam) }
102 }
103}
104
105fn handle_move_msg(
106 handle: HWND,
107 lparam: LPARAM,
108 state_ptr: Rc<WindowsWindowStatePtr>,
109) -> Option<isize> {
110 let mut lock = state_ptr.state.borrow_mut();
111 let origin = logical_point(
112 lparam.signed_loword() as f32,
113 lparam.signed_hiword() as f32,
114 lock.scale_factor,
115 );
116 lock.origin = origin;
117 let size = lock.logical_size;
118 let center_x = origin.x.0 + size.width.0 / 2.;
119 let center_y = origin.y.0 + size.height.0 / 2.;
120 let monitor_bounds = lock.display.bounds();
121 if center_x < monitor_bounds.left().0
122 || center_x > monitor_bounds.right().0
123 || center_y < monitor_bounds.top().0
124 || center_y > monitor_bounds.bottom().0
125 {
126 // center of the window may have moved to another monitor
127 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
128 // minimize the window can trigger this event too, in this case,
129 // monitor is invalid, we do nothing.
130 if !monitor.is_invalid() && lock.display.handle != monitor {
131 // we will get the same monitor if we only have one
132 lock.display = WindowsDisplay::new_with_handle(monitor);
133 }
134 }
135 if let Some(mut callback) = lock.callbacks.moved.take() {
136 drop(lock);
137 callback();
138 state_ptr.state.borrow_mut().callbacks.moved = Some(callback);
139 }
140 Some(0)
141}
142
143fn handle_size_msg(
144 wparam: WPARAM,
145 lparam: LPARAM,
146 state_ptr: Rc<WindowsWindowStatePtr>,
147) -> Option<isize> {
148 let mut lock = state_ptr.state.borrow_mut();
149
150 // Don't resize the renderer when the window is minimized, but record that it was minimized so
151 // that on restore the swap chain can be recreated via `update_drawable_size_even_if_unchanged`.
152 if wparam.0 == SIZE_MINIMIZED as usize {
153 lock.restore_from_minimized = lock.callbacks.request_frame.take();
154 return Some(0);
155 }
156
157 let width = lparam.loword().max(1) as i32;
158 let height = lparam.hiword().max(1) as i32;
159 let new_size = size(DevicePixels(width), DevicePixels(height));
160 let scale_factor = lock.scale_factor;
161 if lock.restore_from_minimized.is_some() {
162 lock.renderer
163 .update_drawable_size_even_if_unchanged(new_size);
164 lock.callbacks.request_frame = lock.restore_from_minimized.take();
165 } else {
166 lock.renderer.update_drawable_size(new_size);
167 }
168 let new_size = new_size.to_pixels(scale_factor);
169 lock.logical_size = new_size;
170 if let Some(mut callback) = lock.callbacks.resize.take() {
171 drop(lock);
172 callback(new_size, scale_factor);
173 state_ptr.state.borrow_mut().callbacks.resize = Some(callback);
174 }
175 Some(0)
176}
177
178fn handle_size_move_loop(handle: HWND) -> Option<isize> {
179 unsafe {
180 let ret = SetTimer(
181 Some(handle),
182 SIZE_MOVE_LOOP_TIMER_ID,
183 USER_TIMER_MINIMUM,
184 None,
185 );
186 if ret == 0 {
187 log::error!(
188 "unable to create timer: {}",
189 std::io::Error::last_os_error()
190 );
191 }
192 }
193 None
194}
195
196fn handle_size_move_loop_exit(handle: HWND) -> Option<isize> {
197 unsafe {
198 KillTimer(Some(handle), SIZE_MOVE_LOOP_TIMER_ID).log_err();
199 }
200 None
201}
202
203fn handle_timer_msg(
204 handle: HWND,
205 wparam: WPARAM,
206 state_ptr: Rc<WindowsWindowStatePtr>,
207) -> Option<isize> {
208 if wparam.0 == SIZE_MOVE_LOOP_TIMER_ID {
209 for runnable in state_ptr.main_receiver.drain() {
210 runnable.run();
211 }
212 handle_paint_msg(handle, state_ptr)
213 } else {
214 None
215 }
216}
217
218fn handle_paint_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
219 let mut lock = state_ptr.state.borrow_mut();
220 if let Some(mut request_frame) = lock.callbacks.request_frame.take() {
221 drop(lock);
222 request_frame(Default::default());
223 state_ptr.state.borrow_mut().callbacks.request_frame = Some(request_frame);
224 }
225 unsafe { ValidateRect(Some(handle), None).ok().log_err() };
226 Some(0)
227}
228
229fn handle_close_msg(state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
230 let mut lock = state_ptr.state.borrow_mut();
231 if let Some(mut callback) = lock.callbacks.should_close.take() {
232 drop(lock);
233 let should_close = callback();
234 state_ptr.state.borrow_mut().callbacks.should_close = Some(callback);
235 if should_close {
236 None
237 } else {
238 Some(0)
239 }
240 } else {
241 None
242 }
243}
244
245fn handle_destroy_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
246 let callback = {
247 let mut lock = state_ptr.state.borrow_mut();
248 lock.callbacks.close.take()
249 };
250 if let Some(callback) = callback {
251 callback();
252 }
253 unsafe {
254 PostThreadMessageW(
255 state_ptr.main_thread_id_win32,
256 WM_GPUI_CLOSE_ONE_WINDOW,
257 WPARAM(state_ptr.validation_number),
258 LPARAM(handle.0 as isize),
259 )
260 .log_err();
261 }
262 Some(0)
263}
264
265fn handle_mouse_move_msg(
266 handle: HWND,
267 lparam: LPARAM,
268 wparam: WPARAM,
269 state_ptr: Rc<WindowsWindowStatePtr>,
270) -> Option<isize> {
271 start_tracking_mouse(handle, &state_ptr, TME_LEAVE);
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(Some(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 start_tracking_mouse(handle, &state_ptr, TME_LEAVE | TME_NONCLIENT);
965
966 let mut lock = state_ptr.state.borrow_mut();
967 if let Some(mut callback) = lock.callbacks.input.take() {
968 let scale_factor = lock.scale_factor;
969 drop(lock);
970 let mut cursor_point = POINT {
971 x: lparam.signed_loword().into(),
972 y: lparam.signed_hiword().into(),
973 };
974 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
975 let event = MouseMoveEvent {
976 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
977 pressed_button: None,
978 modifiers: current_modifiers(),
979 };
980 let result = if callback(PlatformInput::MouseMove(event)).default_prevented {
981 Some(0)
982 } else {
983 Some(1)
984 };
985 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
986
987 result
988 } else {
989 None
990 }
991}
992
993fn handle_nc_mouse_down_msg(
994 handle: HWND,
995 button: MouseButton,
996 wparam: WPARAM,
997 lparam: LPARAM,
998 state_ptr: Rc<WindowsWindowStatePtr>,
999) -> Option<isize> {
1000 if !state_ptr.hide_title_bar {
1001 return None;
1002 }
1003
1004 let mut lock = state_ptr.state.borrow_mut();
1005 if let Some(mut callback) = lock.callbacks.input.take() {
1006 let scale_factor = lock.scale_factor;
1007 let mut cursor_point = POINT {
1008 x: lparam.signed_loword().into(),
1009 y: lparam.signed_hiword().into(),
1010 };
1011 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1012 let physical_point = point(DevicePixels(cursor_point.x), DevicePixels(cursor_point.y));
1013 let click_count = lock.click_state.update(button, physical_point);
1014 drop(lock);
1015 let event = MouseDownEvent {
1016 button,
1017 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1018 modifiers: current_modifiers(),
1019 click_count,
1020 first_mouse: false,
1021 };
1022 let result = if callback(PlatformInput::MouseDown(event)).default_prevented {
1023 Some(0)
1024 } else {
1025 None
1026 };
1027 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
1028
1029 if result.is_some() {
1030 return result;
1031 }
1032 } else {
1033 drop(lock);
1034 };
1035
1036 // Since these are handled in handle_nc_mouse_up_msg we must prevent the default window proc
1037 if button == MouseButton::Left {
1038 match wparam.0 as u32 {
1039 HTMINBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMINBUTTON),
1040 HTMAXBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMAXBUTTON),
1041 HTCLOSE => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTCLOSE),
1042 _ => return None,
1043 };
1044 Some(0)
1045 } else {
1046 None
1047 }
1048}
1049
1050fn handle_nc_mouse_up_msg(
1051 handle: HWND,
1052 button: MouseButton,
1053 wparam: WPARAM,
1054 lparam: LPARAM,
1055 state_ptr: Rc<WindowsWindowStatePtr>,
1056) -> Option<isize> {
1057 if !state_ptr.hide_title_bar {
1058 return None;
1059 }
1060
1061 let mut lock = state_ptr.state.borrow_mut();
1062 if let Some(mut callback) = lock.callbacks.input.take() {
1063 let scale_factor = lock.scale_factor;
1064 drop(lock);
1065 let mut cursor_point = POINT {
1066 x: lparam.signed_loword().into(),
1067 y: lparam.signed_hiword().into(),
1068 };
1069 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1070 let event = MouseUpEvent {
1071 button,
1072 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1073 modifiers: current_modifiers(),
1074 click_count: 1,
1075 };
1076 let result = if callback(PlatformInput::MouseUp(event)).default_prevented {
1077 Some(0)
1078 } else {
1079 None
1080 };
1081 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
1082 if result.is_some() {
1083 return result;
1084 }
1085 } else {
1086 drop(lock);
1087 }
1088
1089 let last_pressed = state_ptr.state.borrow_mut().nc_button_pressed.take();
1090 if button == MouseButton::Left && last_pressed.is_some() {
1091 let last_button = last_pressed.unwrap();
1092 let mut handled = false;
1093 match wparam.0 as u32 {
1094 HTMINBUTTON => {
1095 if last_button == HTMINBUTTON {
1096 unsafe { ShowWindowAsync(handle, SW_MINIMIZE).ok().log_err() };
1097 handled = true;
1098 }
1099 }
1100 HTMAXBUTTON => {
1101 if last_button == HTMAXBUTTON {
1102 if state_ptr.state.borrow().is_maximized() {
1103 unsafe { ShowWindowAsync(handle, SW_NORMAL).ok().log_err() };
1104 } else {
1105 unsafe { ShowWindowAsync(handle, SW_MAXIMIZE).ok().log_err() };
1106 }
1107 handled = true;
1108 }
1109 }
1110 HTCLOSE => {
1111 if last_button == HTCLOSE {
1112 unsafe {
1113 PostMessageW(Some(handle), WM_CLOSE, WPARAM::default(), LPARAM::default())
1114 .log_err()
1115 };
1116 handled = true;
1117 }
1118 }
1119 _ => {}
1120 };
1121 if handled {
1122 return Some(0);
1123 }
1124 }
1125
1126 None
1127}
1128
1129fn handle_cursor_changed(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1130 state_ptr.state.borrow_mut().current_cursor = HCURSOR(lparam.0 as _);
1131 Some(0)
1132}
1133
1134fn handle_set_cursor(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1135 if matches!(
1136 lparam.loword() as u32,
1137 HTLEFT | HTRIGHT | HTTOP | HTTOPLEFT | HTTOPRIGHT | HTBOTTOM | HTBOTTOMLEFT | HTBOTTOMRIGHT
1138 ) {
1139 return None;
1140 }
1141 unsafe { SetCursor(Some(state_ptr.state.borrow().current_cursor)) };
1142 Some(1)
1143}
1144
1145fn handle_system_settings_changed(
1146 handle: HWND,
1147 lparam: LPARAM,
1148 state_ptr: Rc<WindowsWindowStatePtr>,
1149) -> Option<isize> {
1150 let mut lock = state_ptr.state.borrow_mut();
1151 let display = lock.display;
1152 // system settings
1153 lock.system_settings.update(display);
1154 // mouse double click
1155 lock.click_state.system_update();
1156 // window border offset
1157 lock.border_offset.update(handle).log_err();
1158 drop(lock);
1159
1160 // lParam is a pointer to a string that indicates the area containing the system parameter
1161 // that was changed.
1162 let parameter = PCWSTR::from_raw(lparam.0 as _);
1163 if unsafe { !parameter.is_null() && !parameter.is_empty() } {
1164 if let Some(parameter_string) = unsafe { parameter.to_string() }.log_err() {
1165 log::info!("System settings changed: {}", parameter_string);
1166 match parameter_string.as_str() {
1167 "ImmersiveColorSet" => {
1168 handle_system_theme_changed(handle, state_ptr);
1169 }
1170 _ => {}
1171 }
1172 }
1173 }
1174
1175 // Force to trigger WM_NCCALCSIZE event to ensure that we handle auto hide
1176 // taskbar correctly.
1177 notify_frame_changed(handle);
1178 Some(0)
1179}
1180
1181fn handle_system_command(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1182 if wparam.0 == SC_KEYMENU as usize {
1183 let mut lock = state_ptr.state.borrow_mut();
1184 if lock.system_key_handled {
1185 lock.system_key_handled = false;
1186 return Some(0);
1187 }
1188 }
1189 None
1190}
1191
1192fn handle_system_theme_changed(
1193 handle: HWND,
1194 state_ptr: Rc<WindowsWindowStatePtr>,
1195) -> Option<isize> {
1196 let mut callback = state_ptr
1197 .state
1198 .borrow_mut()
1199 .callbacks
1200 .appearance_changed
1201 .take()?;
1202 callback();
1203 state_ptr.state.borrow_mut().callbacks.appearance_changed = Some(callback);
1204 configure_dwm_dark_mode(handle);
1205 Some(0)
1206}
1207
1208fn parse_syskeydown_msg_keystroke(wparam: WPARAM) -> Option<Keystroke> {
1209 let modifiers = current_modifiers();
1210 let vk_code = wparam.loword();
1211
1212 // on Windows, F10 can trigger this event, not just the alt key,
1213 // so when F10 was pressed, handle only it
1214 if !modifiers.alt {
1215 if vk_code == VK_F10.0 {
1216 let offset = vk_code - VK_F1.0;
1217 return Some(Keystroke {
1218 modifiers,
1219 key: format!("f{}", offset + 1),
1220 key_char: None,
1221 });
1222 } else {
1223 return None;
1224 }
1225 }
1226
1227 let key = match VIRTUAL_KEY(vk_code) {
1228 VK_BACK => "backspace",
1229 VK_RETURN => "enter",
1230 VK_TAB => "tab",
1231 VK_UP => "up",
1232 VK_DOWN => "down",
1233 VK_RIGHT => "right",
1234 VK_LEFT => "left",
1235 VK_HOME => "home",
1236 VK_END => "end",
1237 VK_PRIOR => "pageup",
1238 VK_NEXT => "pagedown",
1239 VK_BROWSER_BACK => "back",
1240 VK_BROWSER_FORWARD => "forward",
1241 VK_ESCAPE => "escape",
1242 VK_INSERT => "insert",
1243 VK_DELETE => "delete",
1244 VK_APPS => "menu",
1245 _ => {
1246 let basic_key = basic_vkcode_to_string(vk_code, modifiers);
1247 if basic_key.is_some() {
1248 return basic_key;
1249 } else {
1250 if vk_code >= VK_F1.0 && vk_code <= VK_F24.0 {
1251 let offset = vk_code - VK_F1.0;
1252 return Some(Keystroke {
1253 modifiers,
1254 key: format!("f{}", offset + 1),
1255 key_char: None,
1256 });
1257 } else {
1258 return None;
1259 }
1260 }
1261 }
1262 }
1263 .to_owned();
1264
1265 Some(Keystroke {
1266 modifiers,
1267 key,
1268 key_char: None,
1269 })
1270}
1271
1272enum KeystrokeOrModifier {
1273 Keystroke(Keystroke),
1274 Modifier(Modifiers),
1275}
1276
1277fn parse_keydown_msg_keystroke(wparam: WPARAM) -> Option<KeystrokeOrModifier> {
1278 let vk_code = wparam.loword();
1279
1280 let modifiers = current_modifiers();
1281
1282 let key = match VIRTUAL_KEY(vk_code) {
1283 VK_BACK => "backspace",
1284 VK_RETURN => "enter",
1285 VK_TAB => "tab",
1286 VK_UP => "up",
1287 VK_DOWN => "down",
1288 VK_RIGHT => "right",
1289 VK_LEFT => "left",
1290 VK_HOME => "home",
1291 VK_END => "end",
1292 VK_PRIOR => "pageup",
1293 VK_NEXT => "pagedown",
1294 VK_BROWSER_BACK => "back",
1295 VK_BROWSER_FORWARD => "forward",
1296 VK_ESCAPE => "escape",
1297 VK_INSERT => "insert",
1298 VK_DELETE => "delete",
1299 VK_APPS => "menu",
1300 _ => {
1301 if is_modifier(VIRTUAL_KEY(vk_code)) {
1302 return Some(KeystrokeOrModifier::Modifier(modifiers));
1303 }
1304
1305 if modifiers.control || modifiers.alt {
1306 let basic_key = basic_vkcode_to_string(vk_code, modifiers);
1307 if let Some(basic_key) = basic_key {
1308 return Some(KeystrokeOrModifier::Keystroke(basic_key));
1309 }
1310 }
1311
1312 if vk_code >= VK_F1.0 && vk_code <= VK_F24.0 {
1313 let offset = vk_code - VK_F1.0;
1314 return Some(KeystrokeOrModifier::Keystroke(Keystroke {
1315 modifiers,
1316 key: format!("f{}", offset + 1),
1317 key_char: None,
1318 }));
1319 };
1320 return None;
1321 }
1322 }
1323 .to_owned();
1324
1325 Some(KeystrokeOrModifier::Keystroke(Keystroke {
1326 modifiers,
1327 key,
1328 key_char: None,
1329 }))
1330}
1331
1332fn parse_char_msg_keystroke(wparam: WPARAM) -> Option<Keystroke> {
1333 let first_char = char::from_u32((wparam.0 as u16).into())?;
1334 if first_char.is_control() {
1335 None
1336 } else {
1337 let mut modifiers = current_modifiers();
1338 // for characters that use 'shift' to type it is expected that the
1339 // shift is not reported if the uppercase/lowercase are the same and instead only the key is reported
1340 if first_char.to_ascii_uppercase() == first_char.to_ascii_lowercase() {
1341 modifiers.shift = false;
1342 }
1343 let key = match first_char {
1344 ' ' => "space".to_string(),
1345 first_char => first_char.to_lowercase().to_string(),
1346 };
1347 Some(Keystroke {
1348 modifiers,
1349 key,
1350 key_char: Some(first_char.to_string()),
1351 })
1352 }
1353}
1354
1355fn parse_ime_compostion_string(ctx: HIMC) -> Option<(String, usize)> {
1356 unsafe {
1357 let string_len = ImmGetCompositionStringW(ctx, GCS_COMPSTR, None, 0);
1358 if string_len >= 0 {
1359 let mut buffer = vec![0u8; string_len as usize + 2];
1360 ImmGetCompositionStringW(
1361 ctx,
1362 GCS_COMPSTR,
1363 Some(buffer.as_mut_ptr() as _),
1364 string_len as _,
1365 );
1366 let wstring = std::slice::from_raw_parts::<u16>(
1367 buffer.as_mut_ptr().cast::<u16>(),
1368 string_len as usize / 2,
1369 );
1370 let string = String::from_utf16_lossy(wstring);
1371 Some((string, string_len as usize / 2))
1372 } else {
1373 None
1374 }
1375 }
1376}
1377
1378#[inline]
1379fn retrieve_composition_cursor_position(ctx: HIMC) -> usize {
1380 unsafe { ImmGetCompositionStringW(ctx, GCS_CURSORPOS, None, 0) as usize }
1381}
1382
1383fn parse_ime_compostion_result(ctx: HIMC) -> Option<String> {
1384 unsafe {
1385 let string_len = ImmGetCompositionStringW(ctx, GCS_RESULTSTR, None, 0);
1386 if string_len >= 0 {
1387 let mut buffer = vec![0u8; string_len as usize + 2];
1388 ImmGetCompositionStringW(
1389 ctx,
1390 GCS_RESULTSTR,
1391 Some(buffer.as_mut_ptr() as _),
1392 string_len as _,
1393 );
1394 let wstring = std::slice::from_raw_parts::<u16>(
1395 buffer.as_mut_ptr().cast::<u16>(),
1396 string_len as usize / 2,
1397 );
1398 let string = String::from_utf16_lossy(wstring);
1399 Some(string)
1400 } else {
1401 None
1402 }
1403 }
1404}
1405
1406fn basic_vkcode_to_string(code: u16, modifiers: Modifiers) -> Option<Keystroke> {
1407 let mapped_code = unsafe { MapVirtualKeyW(code as u32, MAPVK_VK_TO_CHAR) };
1408
1409 let key = match mapped_code {
1410 0 => None,
1411 raw_code => char::from_u32(raw_code),
1412 }?
1413 .to_ascii_lowercase();
1414
1415 let key = if matches!(code as u32, 112..=135) {
1416 format!("f{key}")
1417 } else {
1418 key.to_string()
1419 };
1420
1421 Some(Keystroke {
1422 modifiers,
1423 key,
1424 key_char: None,
1425 })
1426}
1427
1428#[inline]
1429fn is_virtual_key_pressed(vkey: VIRTUAL_KEY) -> bool {
1430 unsafe { GetKeyState(vkey.0 as i32) < 0 }
1431}
1432
1433fn is_modifier(virtual_key: VIRTUAL_KEY) -> bool {
1434 matches!(
1435 virtual_key,
1436 VK_CONTROL | VK_MENU | VK_SHIFT | VK_LWIN | VK_RWIN
1437 )
1438}
1439
1440#[inline]
1441pub(crate) fn current_modifiers() -> Modifiers {
1442 Modifiers {
1443 control: is_virtual_key_pressed(VK_CONTROL),
1444 alt: is_virtual_key_pressed(VK_MENU),
1445 shift: is_virtual_key_pressed(VK_SHIFT),
1446 platform: is_virtual_key_pressed(VK_LWIN) || is_virtual_key_pressed(VK_RWIN),
1447 function: false,
1448 }
1449}
1450
1451fn get_client_area_insets(
1452 handle: HWND,
1453 is_maximized: bool,
1454 windows_version: WindowsVersion,
1455) -> RECT {
1456 // For maximized windows, Windows outdents the window rect from the screen's client rect
1457 // by `frame_thickness` on each edge, meaning `insets` must contain `frame_thickness`
1458 // on all sides (including the top) to avoid the client area extending onto adjacent
1459 // monitors.
1460 //
1461 // For non-maximized windows, things become complicated:
1462 //
1463 // - On Windows 10
1464 // The top inset must be zero, since if there is any nonclient area, Windows will draw
1465 // a full native titlebar outside the client area. (This doesn't occur in the maximized
1466 // case.)
1467 //
1468 // - On Windows 11
1469 // The top inset is calculated using an empirical formula that I derived through various
1470 // tests. Without this, the top 1-2 rows of pixels in our window would be obscured.
1471 let dpi = unsafe { GetDpiForWindow(handle) };
1472 let frame_thickness = get_frame_thickness(dpi);
1473 let top_insets = if is_maximized {
1474 frame_thickness
1475 } else {
1476 match windows_version {
1477 WindowsVersion::Win10 => 0,
1478 WindowsVersion::Win11 => (dpi as f32 / USER_DEFAULT_SCREEN_DPI as f32).round() as i32,
1479 }
1480 };
1481 RECT {
1482 left: frame_thickness,
1483 top: top_insets,
1484 right: frame_thickness,
1485 bottom: frame_thickness,
1486 }
1487}
1488
1489// there is some additional non-visible space when talking about window
1490// borders on Windows:
1491// - SM_CXSIZEFRAME: The resize handle.
1492// - SM_CXPADDEDBORDER: Additional border space that isn't part of the resize handle.
1493fn get_frame_thickness(dpi: u32) -> i32 {
1494 let resize_frame_thickness = unsafe { GetSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) };
1495 let padding_thickness = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
1496 resize_frame_thickness + padding_thickness
1497}
1498
1499fn notify_frame_changed(handle: HWND) {
1500 unsafe {
1501 SetWindowPos(
1502 handle,
1503 None,
1504 0,
1505 0,
1506 0,
1507 0,
1508 SWP_FRAMECHANGED
1509 | SWP_NOACTIVATE
1510 | SWP_NOCOPYBITS
1511 | SWP_NOMOVE
1512 | SWP_NOOWNERZORDER
1513 | SWP_NOREPOSITION
1514 | SWP_NOSENDCHANGING
1515 | SWP_NOSIZE
1516 | SWP_NOZORDER,
1517 )
1518 .log_err();
1519 }
1520}
1521
1522fn start_tracking_mouse(
1523 handle: HWND,
1524 state_ptr: &Rc<WindowsWindowStatePtr>,
1525 flags: TRACKMOUSEEVENT_FLAGS,
1526) {
1527 let mut lock = state_ptr.state.borrow_mut();
1528 if !lock.hovered {
1529 lock.hovered = true;
1530 unsafe {
1531 TrackMouseEvent(&mut TRACKMOUSEEVENT {
1532 cbSize: std::mem::size_of::<TRACKMOUSEEVENT>() as u32,
1533 dwFlags: flags,
1534 hwndTrack: handle,
1535 dwHoverTime: HOVER_DEFAULT,
1536 })
1537 .log_err()
1538 };
1539 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
1540 drop(lock);
1541 callback(true);
1542 state_ptr.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
1543 }
1544 }
1545}
1546
1547fn with_input_handler<F, R>(state_ptr: &Rc<WindowsWindowStatePtr>, f: F) -> Option<R>
1548where
1549 F: FnOnce(&mut PlatformInputHandler) -> R,
1550{
1551 let mut input_handler = state_ptr.state.borrow_mut().input_handler.take()?;
1552 let result = f(&mut input_handler);
1553 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
1554 Some(result)
1555}
1556
1557fn with_input_handler_and_scale_factor<F, R>(
1558 state_ptr: &Rc<WindowsWindowStatePtr>,
1559 f: F,
1560) -> Option<R>
1561where
1562 F: FnOnce(&mut PlatformInputHandler, f32) -> Option<R>,
1563{
1564 let mut lock = state_ptr.state.borrow_mut();
1565 let mut input_handler = lock.input_handler.take()?;
1566 let scale_factor = lock.scale_factor;
1567 drop(lock);
1568 let result = f(&mut input_handler, scale_factor);
1569 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
1570 result
1571}