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;
25
26const SIZE_MOVE_LOOP_TIMER_ID: usize = 1;
27const AUTO_HIDE_TASKBAR_THICKNESS_PX: i32 = 1;
28
29pub(crate) fn handle_msg(
30 handle: HWND,
31 msg: u32,
32 wparam: WPARAM,
33 lparam: LPARAM,
34 state_ptr: Rc<WindowsWindowStatePtr>,
35) -> LRESULT {
36 let handled = match msg {
37 WM_ACTIVATE => handle_activate_msg(handle, wparam, state_ptr),
38 WM_CREATE => handle_create_msg(handle, state_ptr),
39 WM_MOVE => handle_move_msg(handle, lparam, state_ptr),
40 WM_SIZE => handle_size_msg(wparam, lparam, state_ptr),
41 WM_ENTERSIZEMOVE | WM_ENTERMENULOOP => handle_size_move_loop(handle),
42 WM_EXITSIZEMOVE | WM_EXITMENULOOP => handle_size_move_loop_exit(handle),
43 WM_TIMER => handle_timer_msg(handle, wparam, state_ptr),
44 WM_NCCALCSIZE => handle_calc_client_size(handle, wparam, lparam, state_ptr),
45 WM_DPICHANGED => handle_dpi_changed_msg(handle, wparam, lparam, state_ptr),
46 WM_DISPLAYCHANGE => handle_display_change_msg(handle, state_ptr),
47 WM_NCHITTEST => handle_hit_test_msg(handle, msg, wparam, lparam, state_ptr),
48 WM_PAINT => handle_paint_msg(handle, state_ptr),
49 WM_CLOSE => handle_close_msg(state_ptr),
50 WM_DESTROY => handle_destroy_msg(handle, state_ptr),
51 WM_MOUSEMOVE => handle_mouse_move_msg(handle, lparam, wparam, state_ptr),
52 WM_MOUSELEAVE | WM_NCMOUSELEAVE => handle_mouse_leave_msg(state_ptr),
53 WM_NCMOUSEMOVE => handle_nc_mouse_move_msg(handle, lparam, state_ptr),
54 WM_NCLBUTTONDOWN => {
55 handle_nc_mouse_down_msg(handle, MouseButton::Left, wparam, lparam, state_ptr)
56 }
57 WM_NCRBUTTONDOWN => {
58 handle_nc_mouse_down_msg(handle, MouseButton::Right, wparam, lparam, state_ptr)
59 }
60 WM_NCMBUTTONDOWN => {
61 handle_nc_mouse_down_msg(handle, MouseButton::Middle, wparam, lparam, state_ptr)
62 }
63 WM_NCLBUTTONUP => {
64 handle_nc_mouse_up_msg(handle, MouseButton::Left, wparam, lparam, state_ptr)
65 }
66 WM_NCRBUTTONUP => {
67 handle_nc_mouse_up_msg(handle, MouseButton::Right, wparam, lparam, state_ptr)
68 }
69 WM_NCMBUTTONUP => {
70 handle_nc_mouse_up_msg(handle, MouseButton::Middle, wparam, lparam, state_ptr)
71 }
72 WM_LBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Left, lparam, state_ptr),
73 WM_RBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Right, lparam, state_ptr),
74 WM_MBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Middle, lparam, state_ptr),
75 WM_XBUTTONDOWN => {
76 handle_xbutton_msg(handle, wparam, lparam, handle_mouse_down_msg, state_ptr)
77 }
78 WM_LBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Left, lparam, state_ptr),
79 WM_RBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Right, lparam, state_ptr),
80 WM_MBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Middle, lparam, state_ptr),
81 WM_XBUTTONUP => handle_xbutton_msg(handle, wparam, lparam, handle_mouse_up_msg, state_ptr),
82 WM_MOUSEWHEEL => handle_mouse_wheel_msg(handle, wparam, lparam, state_ptr),
83 WM_MOUSEHWHEEL => handle_mouse_horizontal_wheel_msg(handle, wparam, lparam, state_ptr),
84 WM_SYSKEYDOWN => handle_syskeydown_msg(wparam, lparam, state_ptr),
85 WM_SYSKEYUP => handle_syskeyup_msg(wparam, state_ptr),
86 WM_SYSCOMMAND => handle_system_command(wparam, state_ptr),
87 WM_KEYDOWN => handle_keydown_msg(wparam, lparam, state_ptr),
88 WM_KEYUP => handle_keyup_msg(wparam, state_ptr),
89 WM_CHAR => handle_char_msg(wparam, lparam, state_ptr),
90 WM_IME_STARTCOMPOSITION => handle_ime_position(handle, state_ptr),
91 WM_IME_COMPOSITION => handle_ime_composition(handle, lparam, state_ptr),
92 WM_SETCURSOR => handle_set_cursor(lparam, state_ptr),
93 WM_SETTINGCHANGE => handle_system_settings_changed(handle, lparam, state_ptr),
94 WM_GPUI_CURSOR_STYLE_CHANGED => handle_cursor_changed(lparam, state_ptr),
95 _ => None,
96 };
97 if let Some(n) = handled {
98 LRESULT(n)
99 } else {
100 unsafe { DefWindowProcW(handle, msg, wparam, lparam) }
101 }
102}
103
104fn handle_move_msg(
105 handle: HWND,
106 lparam: LPARAM,
107 state_ptr: Rc<WindowsWindowStatePtr>,
108) -> Option<isize> {
109 let mut lock = state_ptr.state.borrow_mut();
110 let origin = logical_point(
111 lparam.signed_loword() as f32,
112 lparam.signed_hiword() as f32,
113 lock.scale_factor,
114 );
115 lock.origin = origin;
116 let size = lock.logical_size;
117 let center_x = origin.x.0 + size.width.0 / 2.;
118 let center_y = origin.y.0 + size.height.0 / 2.;
119 let monitor_bounds = lock.display.bounds();
120 if center_x < monitor_bounds.left().0
121 || center_x > monitor_bounds.right().0
122 || center_y < monitor_bounds.top().0
123 || center_y > monitor_bounds.bottom().0
124 {
125 // center of the window may have moved to another monitor
126 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
127 // minimize the window can trigger this event too, in this case,
128 // monitor is invalid, we do nothing.
129 if !monitor.is_invalid() && lock.display.handle != monitor {
130 // we will get the same monitor if we only have one
131 lock.display = WindowsDisplay::new_with_handle(monitor);
132 }
133 }
134 if let Some(mut callback) = lock.callbacks.moved.take() {
135 drop(lock);
136 callback();
137 state_ptr.state.borrow_mut().callbacks.moved = Some(callback);
138 }
139 Some(0)
140}
141
142fn handle_size_msg(
143 wparam: WPARAM,
144 lparam: LPARAM,
145 state_ptr: Rc<WindowsWindowStatePtr>,
146) -> Option<isize> {
147 let mut lock = state_ptr.state.borrow_mut();
148
149 // Don't resize the renderer when the window is minimized, but record that it was minimized so
150 // that on restore the swap chain can be recreated via `update_drawable_size_even_if_unchanged`.
151 if wparam.0 == SIZE_MINIMIZED as usize {
152 lock.restore_from_minimized = lock.callbacks.request_frame.take();
153 return Some(0);
154 }
155
156 let width = lparam.loword().max(1) as i32;
157 let height = lparam.hiword().max(1) as i32;
158 let new_size = size(DevicePixels(width), DevicePixels(height));
159 let scale_factor = lock.scale_factor;
160 if lock.restore_from_minimized.is_some() {
161 lock.renderer
162 .update_drawable_size_even_if_unchanged(new_size);
163 lock.callbacks.request_frame = lock.restore_from_minimized.take();
164 } else {
165 lock.renderer.update_drawable_size(new_size);
166 }
167 let new_size = new_size.to_pixels(scale_factor);
168 lock.logical_size = new_size;
169 if let Some(mut callback) = lock.callbacks.resize.take() {
170 drop(lock);
171 callback(new_size, scale_factor);
172 state_ptr.state.borrow_mut().callbacks.resize = Some(callback);
173 }
174 Some(0)
175}
176
177fn handle_size_move_loop(handle: HWND) -> Option<isize> {
178 unsafe {
179 let ret = SetTimer(handle, SIZE_MOVE_LOOP_TIMER_ID, USER_TIMER_MINIMUM, None);
180 if ret == 0 {
181 log::error!(
182 "unable to create timer: {}",
183 std::io::Error::last_os_error()
184 );
185 }
186 }
187 None
188}
189
190fn handle_size_move_loop_exit(handle: HWND) -> Option<isize> {
191 unsafe {
192 KillTimer(handle, SIZE_MOVE_LOOP_TIMER_ID).log_err();
193 }
194 None
195}
196
197fn handle_timer_msg(
198 handle: HWND,
199 wparam: WPARAM,
200 state_ptr: Rc<WindowsWindowStatePtr>,
201) -> Option<isize> {
202 if wparam.0 == SIZE_MOVE_LOOP_TIMER_ID {
203 for runnable in state_ptr.main_receiver.drain() {
204 runnable.run();
205 }
206 handle_paint_msg(handle, state_ptr)
207 } else {
208 None
209 }
210}
211
212fn handle_paint_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
213 let mut lock = state_ptr.state.borrow_mut();
214 if let Some(mut request_frame) = lock.callbacks.request_frame.take() {
215 drop(lock);
216 request_frame(Default::default());
217 state_ptr.state.borrow_mut().callbacks.request_frame = Some(request_frame);
218 }
219 unsafe { ValidateRect(handle, None).ok().log_err() };
220 Some(0)
221}
222
223fn handle_close_msg(state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
224 let mut lock = state_ptr.state.borrow_mut();
225 if let Some(mut callback) = lock.callbacks.should_close.take() {
226 drop(lock);
227 let should_close = callback();
228 state_ptr.state.borrow_mut().callbacks.should_close = Some(callback);
229 if should_close {
230 None
231 } else {
232 Some(0)
233 }
234 } else {
235 None
236 }
237}
238
239fn handle_destroy_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
240 let callback = {
241 let mut lock = state_ptr.state.borrow_mut();
242 lock.callbacks.close.take()
243 };
244 if let Some(callback) = callback {
245 callback();
246 }
247 unsafe {
248 PostThreadMessageW(
249 state_ptr.main_thread_id_win32,
250 WM_GPUI_CLOSE_ONE_WINDOW,
251 WPARAM(state_ptr.validation_number),
252 LPARAM(handle.0 as isize),
253 )
254 .log_err();
255 }
256 Some(0)
257}
258
259fn handle_mouse_move_msg(
260 handle: HWND,
261 lparam: LPARAM,
262 wparam: WPARAM,
263 state_ptr: Rc<WindowsWindowStatePtr>,
264) -> Option<isize> {
265 start_tracking_mouse(handle, &state_ptr, TME_LEAVE);
266
267 let mut lock = state_ptr.state.borrow_mut();
268 if let Some(mut callback) = lock.callbacks.input.take() {
269 let scale_factor = lock.scale_factor;
270 drop(lock);
271 let pressed_button = match MODIFIERKEYS_FLAGS(wparam.loword() as u32) {
272 flags if flags.contains(MK_LBUTTON) => Some(MouseButton::Left),
273 flags if flags.contains(MK_RBUTTON) => Some(MouseButton::Right),
274 flags if flags.contains(MK_MBUTTON) => Some(MouseButton::Middle),
275 flags if flags.contains(MK_XBUTTON1) => {
276 Some(MouseButton::Navigate(NavigationDirection::Back))
277 }
278 flags if flags.contains(MK_XBUTTON2) => {
279 Some(MouseButton::Navigate(NavigationDirection::Forward))
280 }
281 _ => None,
282 };
283 let x = lparam.signed_loword() as f32;
284 let y = lparam.signed_hiword() as f32;
285 let event = MouseMoveEvent {
286 position: logical_point(x, y, scale_factor),
287 pressed_button,
288 modifiers: current_modifiers(),
289 };
290 let result = if callback(PlatformInput::MouseMove(event)).default_prevented {
291 Some(0)
292 } else {
293 Some(1)
294 };
295 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
296 return result;
297 }
298 Some(1)
299}
300
301fn handle_mouse_leave_msg(state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
302 let mut lock = state_ptr.state.borrow_mut();
303 lock.hovered = false;
304 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
305 drop(lock);
306 callback(false);
307 state_ptr.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
308 }
309
310 Some(0)
311}
312
313fn handle_syskeydown_msg(
314 wparam: WPARAM,
315 lparam: LPARAM,
316 state_ptr: Rc<WindowsWindowStatePtr>,
317) -> Option<isize> {
318 // we need to call `DefWindowProcW`, or we will lose the system-wide `Alt+F4`, `Alt+{other keys}`
319 // shortcuts.
320 let keystroke = parse_syskeydown_msg_keystroke(wparam)?;
321 let mut func = state_ptr.state.borrow_mut().callbacks.input.take()?;
322 let event = KeyDownEvent {
323 keystroke,
324 is_held: lparam.0 & (0x1 << 30) > 0,
325 };
326 let result = if !func(PlatformInput::KeyDown(event)).propagate {
327 state_ptr.state.borrow_mut().system_key_handled = true;
328 Some(0)
329 } else {
330 None
331 };
332 state_ptr.state.borrow_mut().callbacks.input = Some(func);
333
334 result
335}
336
337fn handle_syskeyup_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
338 // we need to call `DefWindowProcW`, or we will lose the system-wide `Alt+F4`, `Alt+{other keys}`
339 // shortcuts.
340 let keystroke = parse_syskeydown_msg_keystroke(wparam)?;
341 let mut func = state_ptr.state.borrow_mut().callbacks.input.take()?;
342 let event = KeyUpEvent { keystroke };
343 let result = if func(PlatformInput::KeyUp(event)).default_prevented {
344 Some(0)
345 } else {
346 Some(1)
347 };
348 state_ptr.state.borrow_mut().callbacks.input = Some(func);
349
350 result
351}
352
353fn handle_keydown_msg(
354 wparam: WPARAM,
355 lparam: LPARAM,
356 state_ptr: Rc<WindowsWindowStatePtr>,
357) -> Option<isize> {
358 let Some(keystroke_or_modifier) = parse_keydown_msg_keystroke(wparam) else {
359 return Some(1);
360 };
361 let mut lock = state_ptr.state.borrow_mut();
362 let Some(mut func) = lock.callbacks.input.take() else {
363 return Some(1);
364 };
365 drop(lock);
366
367 let event = match keystroke_or_modifier {
368 KeystrokeOrModifier::Keystroke(keystroke) => PlatformInput::KeyDown(KeyDownEvent {
369 keystroke,
370 is_held: lparam.0 & (0x1 << 30) > 0,
371 }),
372 KeystrokeOrModifier::Modifier(modifiers) => {
373 PlatformInput::ModifiersChanged(ModifiersChangedEvent { modifiers })
374 }
375 };
376
377 let result = if func(event).default_prevented {
378 Some(0)
379 } else {
380 Some(1)
381 };
382 state_ptr.state.borrow_mut().callbacks.input = Some(func);
383
384 result
385}
386
387fn handle_keyup_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
388 let Some(keystroke_or_modifier) = parse_keydown_msg_keystroke(wparam) else {
389 return Some(1);
390 };
391 let mut lock = state_ptr.state.borrow_mut();
392 let Some(mut func) = lock.callbacks.input.take() else {
393 return Some(1);
394 };
395 drop(lock);
396
397 let event = match keystroke_or_modifier {
398 KeystrokeOrModifier::Keystroke(keystroke) => PlatformInput::KeyUp(KeyUpEvent { keystroke }),
399 KeystrokeOrModifier::Modifier(modifiers) => {
400 PlatformInput::ModifiersChanged(ModifiersChangedEvent { modifiers })
401 }
402 };
403
404 let result = if func(event).default_prevented {
405 Some(0)
406 } else {
407 Some(1)
408 };
409 state_ptr.state.borrow_mut().callbacks.input = Some(func);
410
411 result
412}
413
414fn handle_char_msg(
415 wparam: WPARAM,
416 lparam: LPARAM,
417 state_ptr: Rc<WindowsWindowStatePtr>,
418) -> Option<isize> {
419 let Some(keystroke) = parse_char_msg_keystroke(wparam) else {
420 return Some(1);
421 };
422 let mut lock = state_ptr.state.borrow_mut();
423 let Some(mut func) = lock.callbacks.input.take() else {
424 return Some(1);
425 };
426 drop(lock);
427 let key_char = keystroke.key_char.clone();
428 let event = KeyDownEvent {
429 keystroke,
430 is_held: lparam.0 & (0x1 << 30) > 0,
431 };
432 let dispatch_event_result = func(PlatformInput::KeyDown(event));
433 state_ptr.state.borrow_mut().callbacks.input = Some(func);
434
435 if dispatch_event_result.default_prevented || !dispatch_event_result.propagate {
436 return Some(0);
437 }
438 let Some(ime_char) = key_char else {
439 return Some(1);
440 };
441 with_input_handler(&state_ptr, |input_handler| {
442 input_handler.replace_text_in_range(None, &ime_char);
443 });
444
445 Some(0)
446}
447
448fn handle_mouse_down_msg(
449 handle: HWND,
450 button: MouseButton,
451 lparam: LPARAM,
452 state_ptr: Rc<WindowsWindowStatePtr>,
453) -> Option<isize> {
454 unsafe { SetCapture(handle) };
455 let mut lock = state_ptr.state.borrow_mut();
456 if let Some(mut callback) = lock.callbacks.input.take() {
457 let x = lparam.signed_loword() as f32;
458 let y = lparam.signed_hiword() as f32;
459 let physical_point = point(DevicePixels(x as i32), DevicePixels(y as i32));
460 let click_count = lock.click_state.update(button, physical_point);
461 let scale_factor = lock.scale_factor;
462 drop(lock);
463
464 let event = MouseDownEvent {
465 button,
466 position: logical_point(x, y, scale_factor),
467 modifiers: current_modifiers(),
468 click_count,
469 first_mouse: false,
470 };
471 let result = if callback(PlatformInput::MouseDown(event)).default_prevented {
472 Some(0)
473 } else {
474 Some(1)
475 };
476 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
477
478 result
479 } else {
480 Some(1)
481 }
482}
483
484fn handle_mouse_up_msg(
485 _handle: HWND,
486 button: MouseButton,
487 lparam: LPARAM,
488 state_ptr: Rc<WindowsWindowStatePtr>,
489) -> Option<isize> {
490 unsafe { ReleaseCapture().log_err() };
491 let mut lock = state_ptr.state.borrow_mut();
492 if let Some(mut callback) = lock.callbacks.input.take() {
493 let x = lparam.signed_loword() as f32;
494 let y = lparam.signed_hiword() as f32;
495 let click_count = lock.click_state.current_count;
496 let scale_factor = lock.scale_factor;
497 drop(lock);
498
499 let event = MouseUpEvent {
500 button,
501 position: logical_point(x, y, scale_factor),
502 modifiers: current_modifiers(),
503 click_count,
504 };
505 let result = if callback(PlatformInput::MouseUp(event)).default_prevented {
506 Some(0)
507 } else {
508 Some(1)
509 };
510 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
511
512 result
513 } else {
514 Some(1)
515 }
516}
517
518fn handle_xbutton_msg(
519 handle: HWND,
520 wparam: WPARAM,
521 lparam: LPARAM,
522 handler: impl Fn(HWND, MouseButton, LPARAM, Rc<WindowsWindowStatePtr>) -> Option<isize>,
523 state_ptr: Rc<WindowsWindowStatePtr>,
524) -> Option<isize> {
525 let nav_dir = match wparam.hiword() {
526 XBUTTON1 => NavigationDirection::Back,
527 XBUTTON2 => NavigationDirection::Forward,
528 _ => return Some(1),
529 };
530 handler(handle, MouseButton::Navigate(nav_dir), lparam, state_ptr)
531}
532
533fn handle_mouse_wheel_msg(
534 handle: HWND,
535 wparam: WPARAM,
536 lparam: LPARAM,
537 state_ptr: Rc<WindowsWindowStatePtr>,
538) -> Option<isize> {
539 let modifiers = current_modifiers();
540 let mut lock = state_ptr.state.borrow_mut();
541 if let Some(mut callback) = lock.callbacks.input.take() {
542 let scale_factor = lock.scale_factor;
543 let wheel_scroll_amount = match modifiers.shift {
544 true => lock.system_settings.mouse_wheel_settings.wheel_scroll_chars,
545 false => lock.system_settings.mouse_wheel_settings.wheel_scroll_lines,
546 };
547 drop(lock);
548 let wheel_distance =
549 (wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_amount as f32;
550 let mut cursor_point = POINT {
551 x: lparam.signed_loword().into(),
552 y: lparam.signed_hiword().into(),
553 };
554 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
555 let event = ScrollWheelEvent {
556 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
557 delta: ScrollDelta::Lines(match modifiers.shift {
558 true => Point {
559 x: wheel_distance,
560 y: 0.0,
561 },
562 false => Point {
563 y: wheel_distance,
564 x: 0.0,
565 },
566 }),
567 modifiers: current_modifiers(),
568 touch_phase: TouchPhase::Moved,
569 };
570 let result = if callback(PlatformInput::ScrollWheel(event)).default_prevented {
571 Some(0)
572 } else {
573 Some(1)
574 };
575 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
576
577 result
578 } else {
579 Some(1)
580 }
581}
582
583fn handle_mouse_horizontal_wheel_msg(
584 handle: HWND,
585 wparam: WPARAM,
586 lparam: LPARAM,
587 state_ptr: Rc<WindowsWindowStatePtr>,
588) -> Option<isize> {
589 let mut lock = state_ptr.state.borrow_mut();
590 if let Some(mut callback) = lock.callbacks.input.take() {
591 let scale_factor = lock.scale_factor;
592 let wheel_scroll_chars = lock.system_settings.mouse_wheel_settings.wheel_scroll_chars;
593 drop(lock);
594 let wheel_distance =
595 (-wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_chars as f32;
596 let mut cursor_point = POINT {
597 x: lparam.signed_loword().into(),
598 y: lparam.signed_hiword().into(),
599 };
600 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
601 let event = ScrollWheelEvent {
602 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
603 delta: ScrollDelta::Lines(Point {
604 x: wheel_distance,
605 y: 0.0,
606 }),
607 modifiers: current_modifiers(),
608 touch_phase: TouchPhase::Moved,
609 };
610 let result = if callback(PlatformInput::ScrollWheel(event)).default_prevented {
611 Some(0)
612 } else {
613 Some(1)
614 };
615 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
616
617 result
618 } else {
619 Some(1)
620 }
621}
622
623fn retrieve_caret_position(state_ptr: &Rc<WindowsWindowStatePtr>) -> Option<POINT> {
624 with_input_handler_and_scale_factor(state_ptr, |input_handler, scale_factor| {
625 let caret_range = input_handler.selected_text_range(false)?;
626 let caret_position = input_handler.bounds_for_range(caret_range.range)?;
627 Some(POINT {
628 // logical to physical
629 x: (caret_position.origin.x.0 * scale_factor) as i32,
630 y: (caret_position.origin.y.0 * scale_factor) as i32
631 + ((caret_position.size.height.0 * scale_factor) as i32 / 2),
632 })
633 })
634}
635
636fn handle_ime_position(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
637 unsafe {
638 let ctx = ImmGetContext(handle);
639
640 let Some(caret_position) = retrieve_caret_position(&state_ptr) else {
641 return Some(0);
642 };
643 {
644 let config = COMPOSITIONFORM {
645 dwStyle: CFS_POINT,
646 ptCurrentPos: caret_position,
647 ..Default::default()
648 };
649 ImmSetCompositionWindow(ctx, &config as _).ok().log_err();
650 }
651 {
652 let config = CANDIDATEFORM {
653 dwStyle: CFS_CANDIDATEPOS,
654 ptCurrentPos: caret_position,
655 ..Default::default()
656 };
657 ImmSetCandidateWindow(ctx, &config as _).ok().log_err();
658 }
659 ImmReleaseContext(handle, ctx).ok().log_err();
660 Some(0)
661 }
662}
663
664fn handle_ime_composition(
665 handle: HWND,
666 lparam: LPARAM,
667 state_ptr: Rc<WindowsWindowStatePtr>,
668) -> Option<isize> {
669 let ctx = unsafe { ImmGetContext(handle) };
670 let result = handle_ime_composition_inner(ctx, lparam, state_ptr);
671 unsafe { ImmReleaseContext(handle, ctx).ok().log_err() };
672 result
673}
674
675fn handle_ime_composition_inner(
676 ctx: HIMC,
677 lparam: LPARAM,
678 state_ptr: Rc<WindowsWindowStatePtr>,
679) -> Option<isize> {
680 let mut ime_input = None;
681 if lparam.0 as u32 & GCS_COMPSTR.0 > 0 {
682 let (comp_string, string_len) = parse_ime_compostion_string(ctx)?;
683 with_input_handler(&state_ptr, |input_handler| {
684 input_handler.replace_and_mark_text_in_range(
685 None,
686 &comp_string,
687 Some(string_len..string_len),
688 );
689 })?;
690 ime_input = Some(comp_string);
691 }
692 if lparam.0 as u32 & GCS_CURSORPOS.0 > 0 {
693 let comp_string = &ime_input?;
694 let caret_pos = retrieve_composition_cursor_position(ctx);
695 with_input_handler(&state_ptr, |input_handler| {
696 input_handler.replace_and_mark_text_in_range(
697 None,
698 comp_string,
699 Some(caret_pos..caret_pos),
700 );
701 })?;
702 }
703 if lparam.0 as u32 & GCS_RESULTSTR.0 > 0 {
704 let comp_result = parse_ime_compostion_result(ctx)?;
705 with_input_handler(&state_ptr, |input_handler| {
706 input_handler.replace_text_in_range(None, &comp_result);
707 })?;
708 return Some(0);
709 }
710 // currently, we don't care other stuff
711 None
712}
713
714/// SEE: https://learn.microsoft.com/en-us/windows/win32/winmsg/wm-nccalcsize
715fn handle_calc_client_size(
716 handle: HWND,
717 wparam: WPARAM,
718 lparam: LPARAM,
719 state_ptr: Rc<WindowsWindowStatePtr>,
720) -> Option<isize> {
721 if !state_ptr.hide_title_bar || state_ptr.state.borrow().is_fullscreen() || wparam.0 == 0 {
722 return None;
723 }
724
725 let is_maximized = state_ptr.state.borrow().is_maximized();
726 let insets = get_client_area_insets(handle, is_maximized, state_ptr.windows_version);
727 // wparam is TRUE so lparam points to an NCCALCSIZE_PARAMS structure
728 let mut params = lparam.0 as *mut NCCALCSIZE_PARAMS;
729 let mut requested_client_rect = unsafe { &mut ((*params).rgrc) };
730
731 requested_client_rect[0].left += insets.left;
732 requested_client_rect[0].top += insets.top;
733 requested_client_rect[0].right -= insets.right;
734 requested_client_rect[0].bottom -= insets.bottom;
735
736 // Fix auto hide taskbar not showing. This solution is based on the approach
737 // used by Chrome. However, it may result in one row of pixels being obscured
738 // in our client area. But as Chrome says, "there seems to be no better solution."
739 if is_maximized {
740 if let Some(ref taskbar_position) = state_ptr
741 .state
742 .borrow()
743 .system_settings
744 .auto_hide_taskbar_position
745 {
746 // Fot the auto-hide taskbar, adjust in by 1 pixel on taskbar edge,
747 // so the window isn't treated as a "fullscreen app", which would cause
748 // the taskbar to disappear.
749 match taskbar_position {
750 AutoHideTaskbarPosition::Left => {
751 requested_client_rect[0].left += AUTO_HIDE_TASKBAR_THICKNESS_PX
752 }
753 AutoHideTaskbarPosition::Top => {
754 requested_client_rect[0].top += AUTO_HIDE_TASKBAR_THICKNESS_PX
755 }
756 AutoHideTaskbarPosition::Right => {
757 requested_client_rect[0].right -= AUTO_HIDE_TASKBAR_THICKNESS_PX
758 }
759 AutoHideTaskbarPosition::Bottom => {
760 requested_client_rect[0].bottom -= AUTO_HIDE_TASKBAR_THICKNESS_PX
761 }
762 }
763 }
764 }
765
766 Some(0)
767}
768
769fn handle_activate_msg(
770 handle: HWND,
771 wparam: WPARAM,
772 state_ptr: Rc<WindowsWindowStatePtr>,
773) -> Option<isize> {
774 let activated = wparam.loword() > 0;
775 if state_ptr.hide_title_bar {
776 if let Some(titlebar_rect) = state_ptr.state.borrow().get_titlebar_rect().log_err() {
777 unsafe {
778 InvalidateRect(handle, Some(&titlebar_rect), FALSE)
779 .ok()
780 .log_err()
781 };
782 }
783 }
784 let this = state_ptr.clone();
785 state_ptr
786 .executor
787 .spawn(async move {
788 let mut lock = this.state.borrow_mut();
789 if let Some(mut cb) = lock.callbacks.active_status_change.take() {
790 drop(lock);
791 cb(activated);
792 this.state.borrow_mut().callbacks.active_status_change = Some(cb);
793 }
794 })
795 .detach();
796
797 None
798}
799
800fn handle_create_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
801 if state_ptr.hide_title_bar {
802 notify_frame_changed(handle);
803 Some(0)
804 } else {
805 None
806 }
807}
808
809fn handle_dpi_changed_msg(
810 handle: HWND,
811 wparam: WPARAM,
812 lparam: LPARAM,
813 state_ptr: Rc<WindowsWindowStatePtr>,
814) -> Option<isize> {
815 let new_dpi = wparam.loword() as f32;
816 let mut lock = state_ptr.state.borrow_mut();
817 lock.scale_factor = new_dpi / USER_DEFAULT_SCREEN_DPI as f32;
818 lock.border_offset.update(handle).log_err();
819 drop(lock);
820
821 let rect = unsafe { &*(lparam.0 as *const RECT) };
822 let width = rect.right - rect.left;
823 let height = rect.bottom - rect.top;
824 // this will emit `WM_SIZE` and `WM_MOVE` right here
825 // even before this function returns
826 // the new size is handled in `WM_SIZE`
827 unsafe {
828 SetWindowPos(
829 handle,
830 None,
831 rect.left,
832 rect.top,
833 width,
834 height,
835 SWP_NOZORDER | SWP_NOACTIVATE,
836 )
837 .context("unable to set window position after dpi has changed")
838 .log_err();
839 }
840
841 Some(0)
842}
843
844/// The following conditions will trigger this event:
845/// 1. The monitor on which the window is located goes offline or changes resolution.
846/// 2. Another monitor goes offline, is plugged in, or changes resolution.
847///
848/// In either case, the window will only receive information from the monitor on which
849/// it is located.
850///
851/// For example, in the case of condition 2, where the monitor on which the window is
852/// located has actually changed nothing, it will still receive this event.
853fn handle_display_change_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
854 // NOTE:
855 // Even the `lParam` holds the resolution of the screen, we just ignore it.
856 // Because WM_DPICHANGED, WM_MOVE, WM_SIZE will come first, window reposition and resize
857 // are handled there.
858 // So we only care about if monitor is disconnected.
859 let previous_monitor = state_ptr.as_ref().state.borrow().display;
860 if WindowsDisplay::is_connected(previous_monitor.handle) {
861 // we are fine, other display changed
862 return None;
863 }
864 // display disconnected
865 // in this case, the OS will move our window to another monitor, and minimize it.
866 // we deminimize the window and query the monitor after moving
867 unsafe {
868 let _ = ShowWindow(handle, SW_SHOWNORMAL);
869 };
870 let new_monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
871 // all monitors disconnected
872 if new_monitor.is_invalid() {
873 log::error!("No monitor detected!");
874 return None;
875 }
876 let new_display = WindowsDisplay::new_with_handle(new_monitor);
877 state_ptr.as_ref().state.borrow_mut().display = new_display;
878 Some(0)
879}
880
881fn handle_hit_test_msg(
882 handle: HWND,
883 msg: u32,
884 wparam: WPARAM,
885 lparam: LPARAM,
886 state_ptr: Rc<WindowsWindowStatePtr>,
887) -> Option<isize> {
888 if !state_ptr.is_movable {
889 return None;
890 }
891 if !state_ptr.hide_title_bar {
892 return None;
893 }
894
895 // default handler for resize areas
896 let hit = unsafe { DefWindowProcW(handle, msg, wparam, lparam) };
897 if matches!(
898 hit.0 as u32,
899 HTNOWHERE
900 | HTRIGHT
901 | HTLEFT
902 | HTTOPLEFT
903 | HTTOP
904 | HTTOPRIGHT
905 | HTBOTTOMRIGHT
906 | HTBOTTOM
907 | HTBOTTOMLEFT
908 ) {
909 return Some(hit.0);
910 }
911
912 if state_ptr.state.borrow().is_fullscreen() {
913 return Some(HTCLIENT as _);
914 }
915
916 let dpi = unsafe { GetDpiForWindow(handle) };
917 let frame_y = unsafe { GetSystemMetricsForDpi(SM_CYFRAME, dpi) };
918
919 let mut cursor_point = POINT {
920 x: lparam.signed_loword().into(),
921 y: lparam.signed_hiword().into(),
922 };
923 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
924 if !state_ptr.state.borrow().is_maximized() && cursor_point.y >= 0 && cursor_point.y <= frame_y
925 {
926 return Some(HTTOP as _);
927 }
928
929 let titlebar_rect = state_ptr.state.borrow().get_titlebar_rect();
930 if let Ok(titlebar_rect) = titlebar_rect {
931 if cursor_point.y < titlebar_rect.bottom {
932 let caption_btn_width = (state_ptr.state.borrow().caption_button_width().0
933 * state_ptr.state.borrow().scale_factor) as i32;
934 if cursor_point.x >= titlebar_rect.right - caption_btn_width {
935 return Some(HTCLOSE as _);
936 } else if cursor_point.x >= titlebar_rect.right - caption_btn_width * 2 {
937 return Some(HTMAXBUTTON as _);
938 } else if cursor_point.x >= titlebar_rect.right - caption_btn_width * 3 {
939 return Some(HTMINBUTTON as _);
940 }
941
942 return Some(HTCAPTION as _);
943 }
944 }
945
946 Some(HTCLIENT as _)
947}
948
949fn handle_nc_mouse_move_msg(
950 handle: HWND,
951 lparam: LPARAM,
952 state_ptr: Rc<WindowsWindowStatePtr>,
953) -> Option<isize> {
954 if !state_ptr.hide_title_bar {
955 return None;
956 }
957
958 start_tracking_mouse(handle, &state_ptr, TME_LEAVE | TME_NONCLIENT);
959
960 let mut lock = state_ptr.state.borrow_mut();
961 if let Some(mut callback) = lock.callbacks.input.take() {
962 let scale_factor = lock.scale_factor;
963 drop(lock);
964 let mut cursor_point = POINT {
965 x: lparam.signed_loword().into(),
966 y: lparam.signed_hiword().into(),
967 };
968 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
969 let event = MouseMoveEvent {
970 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
971 pressed_button: None,
972 modifiers: current_modifiers(),
973 };
974 let result = if callback(PlatformInput::MouseMove(event)).default_prevented {
975 Some(0)
976 } else {
977 Some(1)
978 };
979 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
980
981 result
982 } else {
983 None
984 }
985}
986
987fn handle_nc_mouse_down_msg(
988 handle: HWND,
989 button: MouseButton,
990 wparam: WPARAM,
991 lparam: LPARAM,
992 state_ptr: Rc<WindowsWindowStatePtr>,
993) -> Option<isize> {
994 if !state_ptr.hide_title_bar {
995 return None;
996 }
997
998 let mut lock = state_ptr.state.borrow_mut();
999 if let Some(mut callback) = lock.callbacks.input.take() {
1000 let scale_factor = lock.scale_factor;
1001 let mut cursor_point = POINT {
1002 x: lparam.signed_loword().into(),
1003 y: lparam.signed_hiword().into(),
1004 };
1005 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1006 let physical_point = point(DevicePixels(cursor_point.x), DevicePixels(cursor_point.y));
1007 let click_count = lock.click_state.update(button, physical_point);
1008 drop(lock);
1009 let event = MouseDownEvent {
1010 button,
1011 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1012 modifiers: current_modifiers(),
1013 click_count,
1014 first_mouse: false,
1015 };
1016 let result = if callback(PlatformInput::MouseDown(event)).default_prevented {
1017 Some(0)
1018 } else {
1019 None
1020 };
1021 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
1022
1023 if result.is_some() {
1024 return result;
1025 }
1026 } else {
1027 drop(lock);
1028 };
1029
1030 // Since these are handled in handle_nc_mouse_up_msg we must prevent the default window proc
1031 if button == MouseButton::Left {
1032 match wparam.0 as u32 {
1033 HTMINBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMINBUTTON),
1034 HTMAXBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMAXBUTTON),
1035 HTCLOSE => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTCLOSE),
1036 _ => return None,
1037 };
1038 Some(0)
1039 } else {
1040 None
1041 }
1042}
1043
1044fn handle_nc_mouse_up_msg(
1045 handle: HWND,
1046 button: MouseButton,
1047 wparam: WPARAM,
1048 lparam: LPARAM,
1049 state_ptr: Rc<WindowsWindowStatePtr>,
1050) -> Option<isize> {
1051 if !state_ptr.hide_title_bar {
1052 return None;
1053 }
1054
1055 let mut lock = state_ptr.state.borrow_mut();
1056 if let Some(mut callback) = lock.callbacks.input.take() {
1057 let scale_factor = lock.scale_factor;
1058 drop(lock);
1059 let mut cursor_point = POINT {
1060 x: lparam.signed_loword().into(),
1061 y: lparam.signed_hiword().into(),
1062 };
1063 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1064 let event = MouseUpEvent {
1065 button,
1066 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1067 modifiers: current_modifiers(),
1068 click_count: 1,
1069 };
1070 let result = if callback(PlatformInput::MouseUp(event)).default_prevented {
1071 Some(0)
1072 } else {
1073 None
1074 };
1075 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
1076 if result.is_some() {
1077 return result;
1078 }
1079 } else {
1080 drop(lock);
1081 }
1082
1083 let last_pressed = state_ptr.state.borrow_mut().nc_button_pressed.take();
1084 if button == MouseButton::Left && last_pressed.is_some() {
1085 let last_button = last_pressed.unwrap();
1086 let mut handled = false;
1087 match wparam.0 as u32 {
1088 HTMINBUTTON => {
1089 if last_button == HTMINBUTTON {
1090 unsafe { ShowWindowAsync(handle, SW_MINIMIZE).ok().log_err() };
1091 handled = true;
1092 }
1093 }
1094 HTMAXBUTTON => {
1095 if last_button == HTMAXBUTTON {
1096 if state_ptr.state.borrow().is_maximized() {
1097 unsafe { ShowWindowAsync(handle, SW_NORMAL).ok().log_err() };
1098 } else {
1099 unsafe { ShowWindowAsync(handle, SW_MAXIMIZE).ok().log_err() };
1100 }
1101 handled = true;
1102 }
1103 }
1104 HTCLOSE => {
1105 if last_button == HTCLOSE {
1106 unsafe {
1107 PostMessageW(handle, WM_CLOSE, WPARAM::default(), LPARAM::default())
1108 .log_err()
1109 };
1110 handled = true;
1111 }
1112 }
1113 _ => {}
1114 };
1115 if handled {
1116 return Some(0);
1117 }
1118 }
1119
1120 None
1121}
1122
1123fn handle_cursor_changed(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1124 let mut state = state_ptr.state.borrow_mut();
1125 let had_cursor = state.current_cursor.is_some();
1126
1127 state.current_cursor = if lparam.0 == 0 {
1128 None
1129 } else {
1130 Some(HCURSOR(lparam.0 as _))
1131 };
1132
1133 if had_cursor != state.current_cursor.is_some() {
1134 unsafe { SetCursor(state.current_cursor.as_ref()) };
1135 }
1136
1137 Some(0)
1138}
1139
1140fn handle_set_cursor(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1141 if matches!(
1142 lparam.loword() as u32,
1143 HTLEFT | HTRIGHT | HTTOP | HTTOPLEFT | HTTOPRIGHT | HTBOTTOM | HTBOTTOMLEFT | HTBOTTOMRIGHT
1144 ) {
1145 return None;
1146 }
1147 unsafe {
1148 SetCursor(state_ptr.state.borrow().current_cursor.as_ref());
1149 };
1150 Some(1)
1151}
1152
1153fn handle_system_settings_changed(
1154 handle: HWND,
1155 lparam: LPARAM,
1156 state_ptr: Rc<WindowsWindowStatePtr>,
1157) -> Option<isize> {
1158 let mut lock = state_ptr.state.borrow_mut();
1159 let display = lock.display;
1160 // system settings
1161 lock.system_settings.update(display);
1162 // mouse double click
1163 lock.click_state.system_update();
1164 // window border offset
1165 lock.border_offset.update(handle).log_err();
1166 drop(lock);
1167
1168 // lParam is a pointer to a string that indicates the area containing the system parameter
1169 // that was changed.
1170 let parameter = PCWSTR::from_raw(lparam.0 as _);
1171 if unsafe { !parameter.is_null() && !parameter.is_empty() } {
1172 if let Some(parameter_string) = unsafe { parameter.to_string() }.log_err() {
1173 log::info!("System settings changed: {}", parameter_string);
1174 match parameter_string.as_str() {
1175 "ImmersiveColorSet" => {
1176 handle_system_theme_changed(handle, state_ptr);
1177 }
1178 _ => {}
1179 }
1180 }
1181 }
1182
1183 // Force to trigger WM_NCCALCSIZE event to ensure that we handle auto hide
1184 // taskbar correctly.
1185 notify_frame_changed(handle);
1186 Some(0)
1187}
1188
1189fn handle_system_command(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1190 if wparam.0 == SC_KEYMENU as usize {
1191 let mut lock = state_ptr.state.borrow_mut();
1192 if lock.system_key_handled {
1193 lock.system_key_handled = false;
1194 return Some(0);
1195 }
1196 }
1197 None
1198}
1199
1200fn handle_system_theme_changed(
1201 handle: HWND,
1202 state_ptr: Rc<WindowsWindowStatePtr>,
1203) -> Option<isize> {
1204 let mut callback = state_ptr
1205 .state
1206 .borrow_mut()
1207 .callbacks
1208 .appearance_changed
1209 .take()?;
1210 callback();
1211 state_ptr.state.borrow_mut().callbacks.appearance_changed = Some(callback);
1212 configure_dwm_dark_mode(handle);
1213 Some(0)
1214}
1215
1216fn parse_syskeydown_msg_keystroke(wparam: WPARAM) -> Option<Keystroke> {
1217 let modifiers = current_modifiers();
1218 let vk_code = wparam.loword();
1219
1220 // on Windows, F10 can trigger this event, not just the alt key,
1221 // so when F10 was pressed, handle only it
1222 if !modifiers.alt {
1223 if vk_code == VK_F10.0 {
1224 let offset = vk_code - VK_F1.0;
1225 return Some(Keystroke {
1226 modifiers,
1227 key: format!("f{}", offset + 1),
1228 key_char: None,
1229 });
1230 } else {
1231 return None;
1232 }
1233 }
1234
1235 let key = match VIRTUAL_KEY(vk_code) {
1236 VK_BACK => "backspace",
1237 VK_RETURN => "enter",
1238 VK_TAB => "tab",
1239 VK_UP => "up",
1240 VK_DOWN => "down",
1241 VK_RIGHT => "right",
1242 VK_LEFT => "left",
1243 VK_HOME => "home",
1244 VK_END => "end",
1245 VK_PRIOR => "pageup",
1246 VK_NEXT => "pagedown",
1247 VK_BROWSER_BACK => "back",
1248 VK_BROWSER_FORWARD => "forward",
1249 VK_ESCAPE => "escape",
1250 VK_INSERT => "insert",
1251 VK_DELETE => "delete",
1252 VK_APPS => "menu",
1253 _ => {
1254 let basic_key = basic_vkcode_to_string(vk_code, modifiers);
1255 if basic_key.is_some() {
1256 return basic_key;
1257 } else {
1258 if vk_code >= VK_F1.0 && vk_code <= VK_F24.0 {
1259 let offset = vk_code - VK_F1.0;
1260 return Some(Keystroke {
1261 modifiers,
1262 key: format!("f{}", offset + 1),
1263 key_char: None,
1264 });
1265 } else {
1266 return None;
1267 }
1268 }
1269 }
1270 }
1271 .to_owned();
1272
1273 Some(Keystroke {
1274 modifiers,
1275 key,
1276 key_char: None,
1277 })
1278}
1279
1280enum KeystrokeOrModifier {
1281 Keystroke(Keystroke),
1282 Modifier(Modifiers),
1283}
1284
1285fn parse_keydown_msg_keystroke(wparam: WPARAM) -> Option<KeystrokeOrModifier> {
1286 let vk_code = wparam.loword();
1287
1288 let modifiers = current_modifiers();
1289
1290 let key = match VIRTUAL_KEY(vk_code) {
1291 VK_BACK => "backspace",
1292 VK_RETURN => "enter",
1293 VK_TAB => "tab",
1294 VK_UP => "up",
1295 VK_DOWN => "down",
1296 VK_RIGHT => "right",
1297 VK_LEFT => "left",
1298 VK_HOME => "home",
1299 VK_END => "end",
1300 VK_PRIOR => "pageup",
1301 VK_NEXT => "pagedown",
1302 VK_BROWSER_BACK => "back",
1303 VK_BROWSER_FORWARD => "forward",
1304 VK_ESCAPE => "escape",
1305 VK_INSERT => "insert",
1306 VK_DELETE => "delete",
1307 VK_APPS => "menu",
1308 _ => {
1309 if is_modifier(VIRTUAL_KEY(vk_code)) {
1310 return Some(KeystrokeOrModifier::Modifier(modifiers));
1311 }
1312
1313 if modifiers.control || modifiers.alt {
1314 let basic_key = basic_vkcode_to_string(vk_code, modifiers);
1315 if let Some(basic_key) = basic_key {
1316 return Some(KeystrokeOrModifier::Keystroke(basic_key));
1317 }
1318 }
1319
1320 if vk_code >= VK_F1.0 && vk_code <= VK_F24.0 {
1321 let offset = vk_code - VK_F1.0;
1322 return Some(KeystrokeOrModifier::Keystroke(Keystroke {
1323 modifiers,
1324 key: format!("f{}", offset + 1),
1325 key_char: None,
1326 }));
1327 };
1328 return None;
1329 }
1330 }
1331 .to_owned();
1332
1333 Some(KeystrokeOrModifier::Keystroke(Keystroke {
1334 modifiers,
1335 key,
1336 key_char: None,
1337 }))
1338}
1339
1340fn parse_char_msg_keystroke(wparam: WPARAM) -> Option<Keystroke> {
1341 let first_char = char::from_u32((wparam.0 as u16).into())?;
1342 if first_char.is_control() {
1343 None
1344 } else {
1345 let mut modifiers = current_modifiers();
1346 // for characters that use 'shift' to type it is expected that the
1347 // shift is not reported if the uppercase/lowercase are the same and instead only the key is reported
1348 if first_char.to_ascii_uppercase() == first_char.to_ascii_lowercase() {
1349 modifiers.shift = false;
1350 }
1351 let key = match first_char {
1352 ' ' => "space".to_string(),
1353 first_char => first_char.to_lowercase().to_string(),
1354 };
1355 Some(Keystroke {
1356 modifiers,
1357 key,
1358 key_char: Some(first_char.to_string()),
1359 })
1360 }
1361}
1362
1363fn parse_ime_compostion_string(ctx: HIMC) -> Option<(String, usize)> {
1364 unsafe {
1365 let string_len = ImmGetCompositionStringW(ctx, GCS_COMPSTR, None, 0);
1366 if string_len >= 0 {
1367 let mut buffer = vec![0u8; string_len as usize + 2];
1368 ImmGetCompositionStringW(
1369 ctx,
1370 GCS_COMPSTR,
1371 Some(buffer.as_mut_ptr() as _),
1372 string_len as _,
1373 );
1374 let wstring = std::slice::from_raw_parts::<u16>(
1375 buffer.as_mut_ptr().cast::<u16>(),
1376 string_len as usize / 2,
1377 );
1378 let string = String::from_utf16_lossy(wstring);
1379 Some((string, string_len as usize / 2))
1380 } else {
1381 None
1382 }
1383 }
1384}
1385
1386#[inline]
1387fn retrieve_composition_cursor_position(ctx: HIMC) -> usize {
1388 unsafe { ImmGetCompositionStringW(ctx, GCS_CURSORPOS, None, 0) as usize }
1389}
1390
1391fn parse_ime_compostion_result(ctx: HIMC) -> Option<String> {
1392 unsafe {
1393 let string_len = ImmGetCompositionStringW(ctx, GCS_RESULTSTR, None, 0);
1394 if string_len >= 0 {
1395 let mut buffer = vec![0u8; string_len as usize + 2];
1396 ImmGetCompositionStringW(
1397 ctx,
1398 GCS_RESULTSTR,
1399 Some(buffer.as_mut_ptr() as _),
1400 string_len as _,
1401 );
1402 let wstring = std::slice::from_raw_parts::<u16>(
1403 buffer.as_mut_ptr().cast::<u16>(),
1404 string_len as usize / 2,
1405 );
1406 let string = String::from_utf16_lossy(wstring);
1407 Some(string)
1408 } else {
1409 None
1410 }
1411 }
1412}
1413
1414fn basic_vkcode_to_string(code: u16, modifiers: Modifiers) -> Option<Keystroke> {
1415 let mapped_code = unsafe { MapVirtualKeyW(code as u32, MAPVK_VK_TO_CHAR) };
1416
1417 let key = match mapped_code {
1418 0 => None,
1419 raw_code => char::from_u32(raw_code),
1420 }?
1421 .to_ascii_lowercase();
1422
1423 let key = if matches!(code as u32, 112..=135) {
1424 format!("f{key}")
1425 } else {
1426 key.to_string()
1427 };
1428
1429 Some(Keystroke {
1430 modifiers,
1431 key,
1432 key_char: None,
1433 })
1434}
1435
1436#[inline]
1437fn is_virtual_key_pressed(vkey: VIRTUAL_KEY) -> bool {
1438 unsafe { GetKeyState(vkey.0 as i32) < 0 }
1439}
1440
1441fn is_modifier(virtual_key: VIRTUAL_KEY) -> bool {
1442 matches!(
1443 virtual_key,
1444 VK_CONTROL | VK_MENU | VK_SHIFT | VK_LWIN | VK_RWIN
1445 )
1446}
1447
1448#[inline]
1449pub(crate) fn current_modifiers() -> Modifiers {
1450 Modifiers {
1451 control: is_virtual_key_pressed(VK_CONTROL),
1452 alt: is_virtual_key_pressed(VK_MENU),
1453 shift: is_virtual_key_pressed(VK_SHIFT),
1454 platform: is_virtual_key_pressed(VK_LWIN) || is_virtual_key_pressed(VK_RWIN),
1455 function: false,
1456 }
1457}
1458
1459fn get_client_area_insets(
1460 handle: HWND,
1461 is_maximized: bool,
1462 windows_version: WindowsVersion,
1463) -> RECT {
1464 // For maximized windows, Windows outdents the window rect from the screen's client rect
1465 // by `frame_thickness` on each edge, meaning `insets` must contain `frame_thickness`
1466 // on all sides (including the top) to avoid the client area extending onto adjacent
1467 // monitors.
1468 //
1469 // For non-maximized windows, things become complicated:
1470 //
1471 // - On Windows 10
1472 // The top inset must be zero, since if there is any nonclient area, Windows will draw
1473 // a full native titlebar outside the client area. (This doesn't occur in the maximized
1474 // case.)
1475 //
1476 // - On Windows 11
1477 // The top inset is calculated using an empirical formula that I derived through various
1478 // tests. Without this, the top 1-2 rows of pixels in our window would be obscured.
1479 let dpi = unsafe { GetDpiForWindow(handle) };
1480 let frame_thickness = get_frame_thickness(dpi);
1481 let top_insets = if is_maximized {
1482 frame_thickness
1483 } else {
1484 match windows_version {
1485 WindowsVersion::Win10 => 0,
1486 WindowsVersion::Win11 => (dpi as f32 / USER_DEFAULT_SCREEN_DPI as f32).round() as i32,
1487 }
1488 };
1489 RECT {
1490 left: frame_thickness,
1491 top: top_insets,
1492 right: frame_thickness,
1493 bottom: frame_thickness,
1494 }
1495}
1496
1497// there is some additional non-visible space when talking about window
1498// borders on Windows:
1499// - SM_CXSIZEFRAME: The resize handle.
1500// - SM_CXPADDEDBORDER: Additional border space that isn't part of the resize handle.
1501fn get_frame_thickness(dpi: u32) -> i32 {
1502 let resize_frame_thickness = unsafe { GetSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) };
1503 let padding_thickness = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
1504 resize_frame_thickness + padding_thickness
1505}
1506
1507fn notify_frame_changed(handle: HWND) {
1508 unsafe {
1509 SetWindowPos(
1510 handle,
1511 None,
1512 0,
1513 0,
1514 0,
1515 0,
1516 SWP_FRAMECHANGED
1517 | SWP_NOACTIVATE
1518 | SWP_NOCOPYBITS
1519 | SWP_NOMOVE
1520 | SWP_NOOWNERZORDER
1521 | SWP_NOREPOSITION
1522 | SWP_NOSENDCHANGING
1523 | SWP_NOSIZE
1524 | SWP_NOZORDER,
1525 )
1526 .log_err();
1527 }
1528}
1529
1530fn start_tracking_mouse(
1531 handle: HWND,
1532 state_ptr: &Rc<WindowsWindowStatePtr>,
1533 flags: TRACKMOUSEEVENT_FLAGS,
1534) {
1535 let mut lock = state_ptr.state.borrow_mut();
1536 if !lock.hovered {
1537 lock.hovered = true;
1538 unsafe {
1539 TrackMouseEvent(&mut TRACKMOUSEEVENT {
1540 cbSize: std::mem::size_of::<TRACKMOUSEEVENT>() as u32,
1541 dwFlags: flags,
1542 hwndTrack: handle,
1543 dwHoverTime: HOVER_DEFAULT,
1544 })
1545 .log_err()
1546 };
1547 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
1548 drop(lock);
1549 callback(true);
1550 state_ptr.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
1551 }
1552 }
1553}
1554
1555fn with_input_handler<F, R>(state_ptr: &Rc<WindowsWindowStatePtr>, f: F) -> Option<R>
1556where
1557 F: FnOnce(&mut PlatformInputHandler) -> R,
1558{
1559 let mut input_handler = state_ptr.state.borrow_mut().input_handler.take()?;
1560 let result = f(&mut input_handler);
1561 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
1562 Some(result)
1563}
1564
1565fn with_input_handler_and_scale_factor<F, R>(
1566 state_ptr: &Rc<WindowsWindowStatePtr>,
1567 f: F,
1568) -> Option<R>
1569where
1570 F: FnOnce(&mut PlatformInputHandler, f32) -> Option<R>,
1571{
1572 let mut lock = state_ptr.state.borrow_mut();
1573 let mut input_handler = lock.input_handler.take()?;
1574 let scale_factor = lock.scale_factor;
1575 drop(lock);
1576 let result = f(&mut input_handler, scale_factor);
1577 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
1578 result
1579}