1use std::{
2 rc::Rc,
3 time::{Duration, Instant},
4};
5
6use ::util::ResultExt;
7use anyhow::Context as _;
8use windows::{
9 Win32::{
10 Foundation::*,
11 Graphics::Gdi::*,
12 System::SystemServices::*,
13 UI::{
14 Controls::*,
15 HiDpi::*,
16 Input::{Ime::*, KeyboardAndMouse::*},
17 WindowsAndMessaging::*,
18 },
19 },
20 core::PCWSTR,
21};
22
23use crate::*;
24
25pub(crate) const WM_GPUI_CURSOR_STYLE_CHANGED: u32 = WM_USER + 1;
26pub(crate) const WM_GPUI_CLOSE_ONE_WINDOW: u32 = WM_USER + 2;
27pub(crate) const WM_GPUI_TASK_DISPATCHED_ON_MAIN_THREAD: u32 = WM_USER + 3;
28pub(crate) const WM_GPUI_DOCK_MENU_ACTION: u32 = WM_USER + 4;
29pub(crate) const WM_GPUI_FORCE_UPDATE_WINDOW: u32 = WM_USER + 5;
30pub(crate) const WM_GPUI_KEYBOARD_LAYOUT_CHANGED: u32 = WM_USER + 6;
31pub(crate) const WM_GPUI_GPU_DEVICE_LOST: u32 = WM_USER + 7;
32
33const SIZE_MOVE_LOOP_TIMER_ID: usize = 1;
34const AUTO_HIDE_TASKBAR_THICKNESS_PX: i32 = 1;
35
36impl WindowsWindowInner {
37 pub(crate) fn handle_msg(
38 self: &Rc<Self>,
39 handle: HWND,
40 msg: u32,
41 wparam: WPARAM,
42 lparam: LPARAM,
43 ) -> LRESULT {
44 let handled = match msg {
45 WM_ACTIVATE => self.handle_activate_msg(wparam),
46 WM_CREATE => self.handle_create_msg(handle),
47 WM_MOVE => self.handle_move_msg(handle, lparam),
48 WM_SIZE => self.handle_size_msg(wparam, lparam),
49 WM_GETMINMAXINFO => self.handle_get_min_max_info_msg(lparam),
50 WM_ENTERSIZEMOVE | WM_ENTERMENULOOP => self.handle_size_move_loop(handle),
51 WM_EXITSIZEMOVE | WM_EXITMENULOOP => self.handle_size_move_loop_exit(handle),
52 WM_TIMER => self.handle_timer_msg(handle, wparam),
53 WM_NCCALCSIZE => self.handle_calc_client_size(handle, wparam, lparam),
54 WM_DPICHANGED => self.handle_dpi_changed_msg(handle, wparam, lparam),
55 WM_DISPLAYCHANGE => self.handle_display_change_msg(handle),
56 WM_NCHITTEST => self.handle_hit_test_msg(handle, msg, wparam, lparam),
57 WM_PAINT => self.handle_paint_msg(handle),
58 WM_CLOSE => self.handle_close_msg(),
59 WM_DESTROY => self.handle_destroy_msg(handle),
60 WM_MOUSEMOVE => self.handle_mouse_move_msg(handle, lparam, wparam),
61 WM_MOUSELEAVE | WM_NCMOUSELEAVE => self.handle_mouse_leave_msg(),
62 WM_NCMOUSEMOVE => self.handle_nc_mouse_move_msg(handle, lparam),
63 // Treat double click as a second single click, since we track the double clicks ourselves.
64 // If you don't interact with any elements, this will fall through to the windows default
65 // behavior of toggling whether the window is maximized.
66 WM_NCLBUTTONDBLCLK | WM_NCLBUTTONDOWN => {
67 self.handle_nc_mouse_down_msg(handle, MouseButton::Left, wparam, lparam)
68 }
69 WM_NCRBUTTONDOWN => {
70 self.handle_nc_mouse_down_msg(handle, MouseButton::Right, wparam, lparam)
71 }
72 WM_NCMBUTTONDOWN => {
73 self.handle_nc_mouse_down_msg(handle, MouseButton::Middle, wparam, lparam)
74 }
75 WM_NCLBUTTONUP => {
76 self.handle_nc_mouse_up_msg(handle, MouseButton::Left, wparam, lparam)
77 }
78 WM_NCRBUTTONUP => {
79 self.handle_nc_mouse_up_msg(handle, MouseButton::Right, wparam, lparam)
80 }
81 WM_NCMBUTTONUP => {
82 self.handle_nc_mouse_up_msg(handle, MouseButton::Middle, wparam, lparam)
83 }
84 WM_LBUTTONDOWN => self.handle_mouse_down_msg(handle, MouseButton::Left, lparam),
85 WM_RBUTTONDOWN => self.handle_mouse_down_msg(handle, MouseButton::Right, lparam),
86 WM_MBUTTONDOWN => self.handle_mouse_down_msg(handle, MouseButton::Middle, lparam),
87 WM_XBUTTONDOWN => {
88 self.handle_xbutton_msg(handle, wparam, lparam, Self::handle_mouse_down_msg)
89 }
90 WM_LBUTTONUP => self.handle_mouse_up_msg(handle, MouseButton::Left, lparam),
91 WM_RBUTTONUP => self.handle_mouse_up_msg(handle, MouseButton::Right, lparam),
92 WM_MBUTTONUP => self.handle_mouse_up_msg(handle, MouseButton::Middle, lparam),
93 WM_XBUTTONUP => {
94 self.handle_xbutton_msg(handle, wparam, lparam, Self::handle_mouse_up_msg)
95 }
96 WM_MOUSEWHEEL => self.handle_mouse_wheel_msg(handle, wparam, lparam),
97 WM_MOUSEHWHEEL => self.handle_mouse_horizontal_wheel_msg(handle, wparam, lparam),
98 WM_SYSKEYDOWN => self.handle_syskeydown_msg(handle, wparam, lparam),
99 WM_SYSKEYUP => self.handle_syskeyup_msg(handle, wparam, lparam),
100 WM_SYSCOMMAND => self.handle_system_command(wparam),
101 WM_KEYDOWN => self.handle_keydown_msg(handle, wparam, lparam),
102 WM_KEYUP => self.handle_keyup_msg(handle, wparam, lparam),
103 WM_CHAR => self.handle_char_msg(wparam),
104 WM_DEADCHAR => self.handle_dead_char_msg(wparam),
105 WM_IME_STARTCOMPOSITION => self.handle_ime_position(handle),
106 WM_IME_COMPOSITION => self.handle_ime_composition(handle, lparam),
107 WM_SETCURSOR => self.handle_set_cursor(handle, lparam),
108 WM_SETTINGCHANGE => self.handle_system_settings_changed(handle, wparam, lparam),
109 WM_INPUTLANGCHANGE => self.handle_input_language_changed(),
110 WM_SHOWWINDOW => self.handle_window_visibility_changed(handle, wparam),
111 WM_GPUI_CURSOR_STYLE_CHANGED => self.handle_cursor_changed(lparam),
112 WM_GPUI_FORCE_UPDATE_WINDOW => self.draw_window(handle, true),
113 WM_GPUI_GPU_DEVICE_LOST => self.handle_device_lost(lparam),
114 _ => None,
115 };
116 if let Some(n) = handled {
117 LRESULT(n)
118 } else {
119 unsafe { DefWindowProcW(handle, msg, wparam, lparam) }
120 }
121 }
122
123 fn handle_move_msg(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
124 let mut lock = self.state.borrow_mut();
125 let origin = logical_point(
126 lparam.signed_loword() as f32,
127 lparam.signed_hiword() as f32,
128 lock.scale_factor,
129 );
130 lock.origin = origin;
131 let size = lock.logical_size;
132 let center_x = origin.x.0 + size.width.0 / 2.;
133 let center_y = origin.y.0 + size.height.0 / 2.;
134 let monitor_bounds = lock.display.bounds();
135 if center_x < monitor_bounds.left().0
136 || center_x > monitor_bounds.right().0
137 || center_y < monitor_bounds.top().0
138 || center_y > monitor_bounds.bottom().0
139 {
140 // center of the window may have moved to another monitor
141 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
142 // minimize the window can trigger this event too, in this case,
143 // monitor is invalid, we do nothing.
144 if !monitor.is_invalid() && lock.display.handle != monitor {
145 // we will get the same monitor if we only have one
146 lock.display = WindowsDisplay::new_with_handle(monitor);
147 }
148 }
149 if let Some(mut callback) = lock.callbacks.moved.take() {
150 drop(lock);
151 callback();
152 self.state.borrow_mut().callbacks.moved = Some(callback);
153 }
154 Some(0)
155 }
156
157 fn handle_get_min_max_info_msg(&self, lparam: LPARAM) -> Option<isize> {
158 let lock = self.state.borrow();
159 let min_size = lock.min_size?;
160 let scale_factor = lock.scale_factor;
161 let boarder_offset = lock.border_offset;
162 drop(lock);
163 unsafe {
164 let minmax_info = &mut *(lparam.0 as *mut MINMAXINFO);
165 minmax_info.ptMinTrackSize.x =
166 min_size.width.scale(scale_factor).0 as i32 + boarder_offset.width_offset;
167 minmax_info.ptMinTrackSize.y =
168 min_size.height.scale(scale_factor).0 as i32 + boarder_offset.height_offset;
169 }
170 Some(0)
171 }
172
173 fn handle_size_msg(&self, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
174 let mut lock = self.state.borrow_mut();
175
176 // Don't resize the renderer when the window is minimized, but record that it was minimized so
177 // that on restore the swap chain can be recreated via `update_drawable_size_even_if_unchanged`.
178 if wparam.0 == SIZE_MINIMIZED as usize {
179 lock.restore_from_minimized = lock.callbacks.request_frame.take();
180 return Some(0);
181 }
182
183 let width = lparam.loword().max(1) as i32;
184 let height = lparam.hiword().max(1) as i32;
185 let new_size = size(DevicePixels(width), DevicePixels(height));
186
187 let scale_factor = lock.scale_factor;
188 let mut should_resize_renderer = false;
189 if lock.restore_from_minimized.is_some() {
190 lock.callbacks.request_frame = lock.restore_from_minimized.take();
191 } else {
192 should_resize_renderer = true;
193 }
194 drop(lock);
195
196 self.handle_size_change(new_size, scale_factor, should_resize_renderer);
197 Some(0)
198 }
199
200 fn handle_size_change(
201 &self,
202 device_size: Size<DevicePixels>,
203 scale_factor: f32,
204 should_resize_renderer: bool,
205 ) {
206 let new_logical_size = device_size.to_pixels(scale_factor);
207 let mut lock = self.state.borrow_mut();
208 lock.logical_size = new_logical_size;
209 if should_resize_renderer {
210 lock.renderer.resize(device_size).log_err();
211 }
212 if let Some(mut callback) = lock.callbacks.resize.take() {
213 drop(lock);
214 callback(new_logical_size, scale_factor);
215 self.state.borrow_mut().callbacks.resize = Some(callback);
216 }
217 }
218
219 fn handle_size_move_loop(&self, handle: HWND) -> Option<isize> {
220 unsafe {
221 let ret = SetTimer(
222 Some(handle),
223 SIZE_MOVE_LOOP_TIMER_ID,
224 USER_TIMER_MINIMUM,
225 None,
226 );
227 if ret == 0 {
228 log::error!(
229 "unable to create timer: {}",
230 std::io::Error::last_os_error()
231 );
232 }
233 }
234 None
235 }
236
237 fn handle_size_move_loop_exit(&self, handle: HWND) -> Option<isize> {
238 unsafe {
239 KillTimer(Some(handle), SIZE_MOVE_LOOP_TIMER_ID).log_err();
240 }
241 None
242 }
243
244 fn handle_timer_msg(&self, handle: HWND, wparam: WPARAM) -> Option<isize> {
245 if wparam.0 == SIZE_MOVE_LOOP_TIMER_ID {
246 drain_main_receiver(&self.main_receiver);
247 self.handle_paint_msg(handle)
248 } else {
249 None
250 }
251 }
252
253 fn handle_paint_msg(&self, handle: HWND) -> Option<isize> {
254 self.draw_window(handle, false)
255 }
256
257 fn handle_close_msg(&self) -> Option<isize> {
258 let mut callback = self.state.borrow_mut().callbacks.should_close.take()?;
259 let should_close = callback();
260 self.state.borrow_mut().callbacks.should_close = Some(callback);
261 if should_close { None } else { Some(0) }
262 }
263
264 fn handle_destroy_msg(&self, handle: HWND) -> Option<isize> {
265 let callback = {
266 let mut lock = self.state.borrow_mut();
267 lock.callbacks.close.take()
268 };
269 if let Some(callback) = callback {
270 callback();
271 }
272 unsafe {
273 PostMessageW(
274 Some(self.platform_window_handle),
275 WM_GPUI_CLOSE_ONE_WINDOW,
276 WPARAM(self.validation_number),
277 LPARAM(handle.0 as isize),
278 )
279 .log_err();
280 }
281 Some(0)
282 }
283
284 fn handle_mouse_move_msg(&self, handle: HWND, lparam: LPARAM, wparam: WPARAM) -> Option<isize> {
285 self.start_tracking_mouse(handle, TME_LEAVE);
286
287 let mut lock = self.state.borrow_mut();
288 let Some(mut func) = lock.callbacks.input.take() else {
289 return Some(1);
290 };
291 let scale_factor = lock.scale_factor;
292 drop(lock);
293
294 let pressed_button = match MODIFIERKEYS_FLAGS(wparam.loword() as u32) {
295 flags if flags.contains(MK_LBUTTON) => Some(MouseButton::Left),
296 flags if flags.contains(MK_RBUTTON) => Some(MouseButton::Right),
297 flags if flags.contains(MK_MBUTTON) => Some(MouseButton::Middle),
298 flags if flags.contains(MK_XBUTTON1) => {
299 Some(MouseButton::Navigate(NavigationDirection::Back))
300 }
301 flags if flags.contains(MK_XBUTTON2) => {
302 Some(MouseButton::Navigate(NavigationDirection::Forward))
303 }
304 _ => None,
305 };
306 let x = lparam.signed_loword() as f32;
307 let y = lparam.signed_hiword() as f32;
308 let input = PlatformInput::MouseMove(MouseMoveEvent {
309 position: logical_point(x, y, scale_factor),
310 pressed_button,
311 modifiers: current_modifiers(),
312 });
313 let handled = !func(input).propagate;
314 self.state.borrow_mut().callbacks.input = Some(func);
315
316 if handled { Some(0) } else { Some(1) }
317 }
318
319 fn handle_mouse_leave_msg(&self) -> Option<isize> {
320 let mut lock = self.state.borrow_mut();
321 lock.hovered = false;
322 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
323 drop(lock);
324 callback(false);
325 self.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
326 }
327
328 Some(0)
329 }
330
331 fn handle_syskeydown_msg(&self, handle: HWND, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
332 let mut lock = self.state.borrow_mut();
333 let input = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
334 PlatformInput::KeyDown(KeyDownEvent {
335 keystroke,
336 is_held: lparam.0 & (0x1 << 30) > 0,
337 })
338 })?;
339 let mut func = lock.callbacks.input.take()?;
340 drop(lock);
341
342 let handled = !func(input).propagate;
343
344 let mut lock = self.state.borrow_mut();
345 lock.callbacks.input = Some(func);
346
347 if handled {
348 lock.system_key_handled = true;
349 Some(0)
350 } else {
351 // we need to call `DefWindowProcW`, or we will lose the system-wide `Alt+F4`, `Alt+{other keys}`
352 // shortcuts.
353 None
354 }
355 }
356
357 fn handle_syskeyup_msg(&self, handle: HWND, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
358 let mut lock = self.state.borrow_mut();
359 let input = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
360 PlatformInput::KeyUp(KeyUpEvent { keystroke })
361 })?;
362 let mut func = lock.callbacks.input.take()?;
363 drop(lock);
364 func(input);
365 self.state.borrow_mut().callbacks.input = Some(func);
366
367 // Always return 0 to indicate that the message was handled, so we could properly handle `ModifiersChanged` event.
368 Some(0)
369 }
370
371 // It's a known bug that you can't trigger `ctrl-shift-0`. See:
372 // https://superuser.com/questions/1455762/ctrl-shift-number-key-combination-has-stopped-working-for-a-few-numbers
373 fn handle_keydown_msg(&self, handle: HWND, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
374 let mut lock = self.state.borrow_mut();
375 let Some(input) = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
376 PlatformInput::KeyDown(KeyDownEvent {
377 keystroke,
378 is_held: lparam.0 & (0x1 << 30) > 0,
379 })
380 }) else {
381 return Some(1);
382 };
383 drop(lock);
384
385 let is_composing = self
386 .with_input_handler(|input_handler| input_handler.marked_text_range())
387 .flatten()
388 .is_some();
389 if is_composing {
390 translate_message(handle, wparam, lparam);
391 return Some(0);
392 }
393
394 let Some(mut func) = self.state.borrow_mut().callbacks.input.take() else {
395 return Some(1);
396 };
397
398 let handled = !func(input).propagate;
399
400 self.state.borrow_mut().callbacks.input = Some(func);
401
402 if handled {
403 Some(0)
404 } else {
405 translate_message(handle, wparam, lparam);
406 Some(1)
407 }
408 }
409
410 fn handle_keyup_msg(&self, handle: HWND, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
411 let mut lock = self.state.borrow_mut();
412 let Some(input) = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
413 PlatformInput::KeyUp(KeyUpEvent { keystroke })
414 }) else {
415 return Some(1);
416 };
417
418 let Some(mut func) = lock.callbacks.input.take() else {
419 return Some(1);
420 };
421 drop(lock);
422
423 let handled = !func(input).propagate;
424 self.state.borrow_mut().callbacks.input = Some(func);
425
426 if handled { Some(0) } else { Some(1) }
427 }
428
429 fn handle_char_msg(&self, wparam: WPARAM) -> Option<isize> {
430 let input = self.parse_char_message(wparam)?;
431 self.with_input_handler(|input_handler| {
432 input_handler.replace_text_in_range(None, &input);
433 });
434
435 Some(0)
436 }
437
438 fn handle_dead_char_msg(&self, wparam: WPARAM) -> Option<isize> {
439 let ch = char::from_u32(wparam.0 as u32)?.to_string();
440 self.with_input_handler(|input_handler| {
441 input_handler.replace_and_mark_text_in_range(None, &ch, None);
442 });
443 None
444 }
445
446 fn handle_mouse_down_msg(
447 &self,
448 handle: HWND,
449 button: MouseButton,
450 lparam: LPARAM,
451 ) -> Option<isize> {
452 unsafe { SetCapture(handle) };
453 let mut lock = self.state.borrow_mut();
454 let Some(mut func) = lock.callbacks.input.take() else {
455 return Some(1);
456 };
457 let x = lparam.signed_loword();
458 let y = lparam.signed_hiword();
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 input = PlatformInput::MouseDown(MouseDownEvent {
465 button,
466 position: logical_point(x as f32, y as f32, scale_factor),
467 modifiers: current_modifiers(),
468 click_count,
469 first_mouse: false,
470 });
471 let handled = !func(input).propagate;
472 self.state.borrow_mut().callbacks.input = Some(func);
473
474 if handled { Some(0) } else { Some(1) }
475 }
476
477 fn handle_mouse_up_msg(
478 &self,
479 _handle: HWND,
480 button: MouseButton,
481 lparam: LPARAM,
482 ) -> Option<isize> {
483 unsafe { ReleaseCapture().log_err() };
484 let mut lock = self.state.borrow_mut();
485 let Some(mut func) = lock.callbacks.input.take() else {
486 return Some(1);
487 };
488 let x = lparam.signed_loword() as f32;
489 let y = lparam.signed_hiword() as f32;
490 let click_count = lock.click_state.current_count;
491 let scale_factor = lock.scale_factor;
492 drop(lock);
493
494 let input = PlatformInput::MouseUp(MouseUpEvent {
495 button,
496 position: logical_point(x, y, scale_factor),
497 modifiers: current_modifiers(),
498 click_count,
499 });
500 let handled = !func(input).propagate;
501 self.state.borrow_mut().callbacks.input = Some(func);
502
503 if handled { Some(0) } else { Some(1) }
504 }
505
506 fn handle_xbutton_msg(
507 &self,
508 handle: HWND,
509 wparam: WPARAM,
510 lparam: LPARAM,
511 handler: impl Fn(&Self, HWND, MouseButton, LPARAM) -> Option<isize>,
512 ) -> Option<isize> {
513 let nav_dir = match wparam.hiword() {
514 XBUTTON1 => NavigationDirection::Back,
515 XBUTTON2 => NavigationDirection::Forward,
516 _ => return Some(1),
517 };
518 handler(self, handle, MouseButton::Navigate(nav_dir), lparam)
519 }
520
521 fn handle_mouse_wheel_msg(
522 &self,
523 handle: HWND,
524 wparam: WPARAM,
525 lparam: LPARAM,
526 ) -> Option<isize> {
527 let modifiers = current_modifiers();
528 let mut lock = self.state.borrow_mut();
529 let Some(mut func) = lock.callbacks.input.take() else {
530 return Some(1);
531 };
532 let scale_factor = lock.scale_factor;
533 let wheel_scroll_amount = match modifiers.shift {
534 true => {
535 self.system_settings
536 .borrow()
537 .mouse_wheel_settings
538 .wheel_scroll_chars
539 }
540 false => {
541 self.system_settings
542 .borrow()
543 .mouse_wheel_settings
544 .wheel_scroll_lines
545 }
546 };
547 drop(lock);
548
549 let wheel_distance =
550 (wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_amount as f32;
551 let mut cursor_point = POINT {
552 x: lparam.signed_loword().into(),
553 y: lparam.signed_hiword().into(),
554 };
555 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
556 let input = PlatformInput::ScrollWheel(ScrollWheelEvent {
557 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
558 delta: ScrollDelta::Lines(match modifiers.shift {
559 true => Point {
560 x: wheel_distance,
561 y: 0.0,
562 },
563 false => Point {
564 y: wheel_distance,
565 x: 0.0,
566 },
567 }),
568 modifiers,
569 touch_phase: TouchPhase::Moved,
570 });
571 let handled = !func(input).propagate;
572 self.state.borrow_mut().callbacks.input = Some(func);
573
574 if handled { Some(0) } else { Some(1) }
575 }
576
577 fn handle_mouse_horizontal_wheel_msg(
578 &self,
579 handle: HWND,
580 wparam: WPARAM,
581 lparam: LPARAM,
582 ) -> Option<isize> {
583 let mut lock = self.state.borrow_mut();
584 let Some(mut func) = lock.callbacks.input.take() else {
585 return Some(1);
586 };
587 let scale_factor = lock.scale_factor;
588 let wheel_scroll_chars = self
589 .system_settings
590 .borrow()
591 .mouse_wheel_settings
592 .wheel_scroll_chars;
593 drop(lock);
594
595 let wheel_distance =
596 (-wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_chars as f32;
597 let mut cursor_point = POINT {
598 x: lparam.signed_loword().into(),
599 y: lparam.signed_hiword().into(),
600 };
601 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
602 let event = PlatformInput::ScrollWheel(ScrollWheelEvent {
603 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
604 delta: ScrollDelta::Lines(Point {
605 x: wheel_distance,
606 y: 0.0,
607 }),
608 modifiers: current_modifiers(),
609 touch_phase: TouchPhase::Moved,
610 });
611 let handled = !func(event).propagate;
612 self.state.borrow_mut().callbacks.input = Some(func);
613
614 if handled { Some(0) } else { Some(1) }
615 }
616
617 fn retrieve_caret_position(&self) -> Option<POINT> {
618 self.with_input_handler_and_scale_factor(|input_handler, scale_factor| {
619 let caret_range = input_handler.selected_text_range(false)?;
620 let caret_position = input_handler.bounds_for_range(caret_range.range)?;
621 Some(POINT {
622 // logical to physical
623 x: (caret_position.origin.x.0 * scale_factor) as i32,
624 y: (caret_position.origin.y.0 * scale_factor) as i32
625 + ((caret_position.size.height.0 * scale_factor) as i32 / 2),
626 })
627 })
628 }
629
630 fn handle_ime_position(&self, handle: HWND) -> Option<isize> {
631 unsafe {
632 let ctx = ImmGetContext(handle);
633
634 let Some(caret_position) = self.retrieve_caret_position() else {
635 return Some(0);
636 };
637 {
638 let config = COMPOSITIONFORM {
639 dwStyle: CFS_POINT,
640 ptCurrentPos: caret_position,
641 ..Default::default()
642 };
643 ImmSetCompositionWindow(ctx, &config as _).ok().log_err();
644 }
645 {
646 let config = CANDIDATEFORM {
647 dwStyle: CFS_CANDIDATEPOS,
648 ptCurrentPos: caret_position,
649 ..Default::default()
650 };
651 ImmSetCandidateWindow(ctx, &config as _).ok().log_err();
652 }
653 ImmReleaseContext(handle, ctx).ok().log_err();
654 Some(0)
655 }
656 }
657
658 fn handle_ime_composition(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
659 let ctx = unsafe { ImmGetContext(handle) };
660 let result = self.handle_ime_composition_inner(ctx, lparam);
661 unsafe { ImmReleaseContext(handle, ctx).ok().log_err() };
662 result
663 }
664
665 fn handle_ime_composition_inner(&self, ctx: HIMC, lparam: LPARAM) -> Option<isize> {
666 let lparam = lparam.0 as u32;
667 if lparam == 0 {
668 // Japanese IME may send this message with lparam = 0, which indicates that
669 // there is no composition string.
670 self.with_input_handler(|input_handler| {
671 input_handler.replace_text_in_range(None, "");
672 })?;
673 Some(0)
674 } else {
675 if lparam & GCS_COMPSTR.0 > 0 {
676 let comp_string = parse_ime_composition_string(ctx, GCS_COMPSTR)?;
677 let caret_pos =
678 (!comp_string.is_empty() && lparam & GCS_CURSORPOS.0 > 0).then(|| {
679 let pos = retrieve_composition_cursor_position(ctx);
680 pos..pos
681 });
682 self.with_input_handler(|input_handler| {
683 input_handler.replace_and_mark_text_in_range(None, &comp_string, caret_pos);
684 })?;
685 }
686 if lparam & GCS_RESULTSTR.0 > 0 {
687 let comp_result = parse_ime_composition_string(ctx, GCS_RESULTSTR)?;
688 self.with_input_handler(|input_handler| {
689 input_handler.replace_text_in_range(None, &comp_result);
690 })?;
691 return Some(0);
692 }
693
694 // currently, we don't care other stuff
695 None
696 }
697 }
698
699 /// SEE: https://learn.microsoft.com/en-us/windows/win32/winmsg/wm-nccalcsize
700 fn handle_calc_client_size(
701 &self,
702 handle: HWND,
703 wparam: WPARAM,
704 lparam: LPARAM,
705 ) -> Option<isize> {
706 if !self.hide_title_bar || self.state.borrow().is_fullscreen() || wparam.0 == 0 {
707 return None;
708 }
709
710 let is_maximized = self.state.borrow().is_maximized();
711 let insets = get_client_area_insets(handle, is_maximized, self.windows_version);
712 // wparam is TRUE so lparam points to an NCCALCSIZE_PARAMS structure
713 let mut params = lparam.0 as *mut NCCALCSIZE_PARAMS;
714 let mut requested_client_rect = unsafe { &mut ((*params).rgrc) };
715
716 requested_client_rect[0].left += insets.left;
717 requested_client_rect[0].top += insets.top;
718 requested_client_rect[0].right -= insets.right;
719 requested_client_rect[0].bottom -= insets.bottom;
720
721 // Fix auto hide taskbar not showing. This solution is based on the approach
722 // used by Chrome. However, it may result in one row of pixels being obscured
723 // in our client area. But as Chrome says, "there seems to be no better solution."
724 if is_maximized
725 && let Some(ref taskbar_position) =
726 self.system_settings.borrow().auto_hide_taskbar_position
727 {
728 // For the auto-hide taskbar, adjust in by 1 pixel on taskbar edge,
729 // so the window isn't treated as a "fullscreen app", which would cause
730 // the taskbar to disappear.
731 match taskbar_position {
732 AutoHideTaskbarPosition::Left => {
733 requested_client_rect[0].left += AUTO_HIDE_TASKBAR_THICKNESS_PX
734 }
735 AutoHideTaskbarPosition::Top => {
736 requested_client_rect[0].top += AUTO_HIDE_TASKBAR_THICKNESS_PX
737 }
738 AutoHideTaskbarPosition::Right => {
739 requested_client_rect[0].right -= AUTO_HIDE_TASKBAR_THICKNESS_PX
740 }
741 AutoHideTaskbarPosition::Bottom => {
742 requested_client_rect[0].bottom -= AUTO_HIDE_TASKBAR_THICKNESS_PX
743 }
744 }
745 }
746
747 Some(0)
748 }
749
750 fn handle_activate_msg(self: &Rc<Self>, wparam: WPARAM) -> Option<isize> {
751 let activated = wparam.loword() > 0;
752 let this = self.clone();
753 self.executor
754 .spawn(async move {
755 let mut lock = this.state.borrow_mut();
756 if let Some(mut func) = lock.callbacks.active_status_change.take() {
757 drop(lock);
758 func(activated);
759 this.state.borrow_mut().callbacks.active_status_change = Some(func);
760 }
761 })
762 .detach();
763
764 None
765 }
766
767 fn handle_create_msg(&self, handle: HWND) -> Option<isize> {
768 if self.hide_title_bar {
769 notify_frame_changed(handle);
770 Some(0)
771 } else {
772 None
773 }
774 }
775
776 fn handle_dpi_changed_msg(
777 &self,
778 handle: HWND,
779 wparam: WPARAM,
780 lparam: LPARAM,
781 ) -> Option<isize> {
782 let new_dpi = wparam.loword() as f32;
783 let mut lock = self.state.borrow_mut();
784 let is_maximized = lock.is_maximized();
785 let new_scale_factor = new_dpi / USER_DEFAULT_SCREEN_DPI as f32;
786 lock.scale_factor = new_scale_factor;
787 lock.border_offset.update(handle).log_err();
788 drop(lock);
789
790 let rect = unsafe { &*(lparam.0 as *const RECT) };
791 let width = rect.right - rect.left;
792 let height = rect.bottom - rect.top;
793 // this will emit `WM_SIZE` and `WM_MOVE` right here
794 // even before this function returns
795 // the new size is handled in `WM_SIZE`
796 unsafe {
797 SetWindowPos(
798 handle,
799 None,
800 rect.left,
801 rect.top,
802 width,
803 height,
804 SWP_NOZORDER | SWP_NOACTIVATE,
805 )
806 .context("unable to set window position after dpi has changed")
807 .log_err();
808 }
809
810 // When maximized, SetWindowPos doesn't send WM_SIZE, so we need to manually
811 // update the size and call the resize callback
812 if is_maximized {
813 let device_size = size(DevicePixels(width), DevicePixels(height));
814 self.handle_size_change(device_size, new_scale_factor, true);
815 }
816
817 Some(0)
818 }
819
820 /// The following conditions will trigger this event:
821 /// 1. The monitor on which the window is located goes offline or changes resolution.
822 /// 2. Another monitor goes offline, is plugged in, or changes resolution.
823 ///
824 /// In either case, the window will only receive information from the monitor on which
825 /// it is located.
826 ///
827 /// For example, in the case of condition 2, where the monitor on which the window is
828 /// located has actually changed nothing, it will still receive this event.
829 fn handle_display_change_msg(&self, handle: HWND) -> Option<isize> {
830 // NOTE:
831 // Even the `lParam` holds the resolution of the screen, we just ignore it.
832 // Because WM_DPICHANGED, WM_MOVE, WM_SIZE will come first, window reposition and resize
833 // are handled there.
834 // So we only care about if monitor is disconnected.
835 let previous_monitor = self.state.borrow().display;
836 if WindowsDisplay::is_connected(previous_monitor.handle) {
837 // we are fine, other display changed
838 return None;
839 }
840 // display disconnected
841 // in this case, the OS will move our window to another monitor, and minimize it.
842 // we deminimize the window and query the monitor after moving
843 unsafe {
844 let _ = ShowWindow(handle, SW_SHOWNORMAL);
845 };
846 let new_monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
847 // all monitors disconnected
848 if new_monitor.is_invalid() {
849 log::error!("No monitor detected!");
850 return None;
851 }
852 let new_display = WindowsDisplay::new_with_handle(new_monitor);
853 self.state.borrow_mut().display = new_display;
854 Some(0)
855 }
856
857 fn handle_hit_test_msg(
858 &self,
859 handle: HWND,
860 msg: u32,
861 wparam: WPARAM,
862 lparam: LPARAM,
863 ) -> Option<isize> {
864 if !self.is_movable || self.state.borrow().is_fullscreen() {
865 return None;
866 }
867
868 let mut lock = self.state.borrow_mut();
869 if let Some(mut callback) = lock.callbacks.hit_test_window_control.take() {
870 drop(lock);
871 let area = callback();
872 self.state.borrow_mut().callbacks.hit_test_window_control = Some(callback);
873 if let Some(area) = area {
874 return match area {
875 WindowControlArea::Drag => Some(HTCAPTION as _),
876 WindowControlArea::Close => Some(HTCLOSE as _),
877 WindowControlArea::Max => Some(HTMAXBUTTON as _),
878 WindowControlArea::Min => Some(HTMINBUTTON as _),
879 };
880 }
881 } else {
882 drop(lock);
883 }
884
885 if !self.hide_title_bar {
886 // If the OS draws the title bar, we don't need to handle hit test messages.
887 return None;
888 }
889
890 // default handler for resize areas
891 let hit = unsafe { DefWindowProcW(handle, msg, wparam, lparam) };
892 if matches!(
893 hit.0 as u32,
894 HTNOWHERE
895 | HTRIGHT
896 | HTLEFT
897 | HTTOPLEFT
898 | HTTOP
899 | HTTOPRIGHT
900 | HTBOTTOMRIGHT
901 | HTBOTTOM
902 | HTBOTTOMLEFT
903 ) {
904 return Some(hit.0);
905 }
906
907 if self.state.borrow().is_fullscreen() {
908 return Some(HTCLIENT as _);
909 }
910
911 let dpi = unsafe { GetDpiForWindow(handle) };
912 let frame_y = unsafe { GetSystemMetricsForDpi(SM_CYFRAME, dpi) };
913
914 let mut cursor_point = POINT {
915 x: lparam.signed_loword().into(),
916 y: lparam.signed_hiword().into(),
917 };
918 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
919 if !self.state.borrow().is_maximized() && cursor_point.y >= 0 && cursor_point.y <= frame_y {
920 return Some(HTTOP as _);
921 }
922
923 Some(HTCLIENT as _)
924 }
925
926 fn handle_nc_mouse_move_msg(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
927 self.start_tracking_mouse(handle, TME_LEAVE | TME_NONCLIENT);
928
929 let mut lock = self.state.borrow_mut();
930 let mut func = lock.callbacks.input.take()?;
931 let scale_factor = lock.scale_factor;
932 drop(lock);
933
934 let mut cursor_point = POINT {
935 x: lparam.signed_loword().into(),
936 y: lparam.signed_hiword().into(),
937 };
938 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
939 let input = PlatformInput::MouseMove(MouseMoveEvent {
940 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
941 pressed_button: None,
942 modifiers: current_modifiers(),
943 });
944 let handled = !func(input).propagate;
945 self.state.borrow_mut().callbacks.input = Some(func);
946
947 if handled { Some(0) } else { None }
948 }
949
950 fn handle_nc_mouse_down_msg(
951 &self,
952 handle: HWND,
953 button: MouseButton,
954 wparam: WPARAM,
955 lparam: LPARAM,
956 ) -> Option<isize> {
957 let mut lock = self.state.borrow_mut();
958 if let Some(mut func) = lock.callbacks.input.take() {
959 let scale_factor = lock.scale_factor;
960 let mut cursor_point = POINT {
961 x: lparam.signed_loword().into(),
962 y: lparam.signed_hiword().into(),
963 };
964 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
965 let physical_point = point(DevicePixels(cursor_point.x), DevicePixels(cursor_point.y));
966 let click_count = lock.click_state.update(button, physical_point);
967 drop(lock);
968
969 let input = PlatformInput::MouseDown(MouseDownEvent {
970 button,
971 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
972 modifiers: current_modifiers(),
973 click_count,
974 first_mouse: false,
975 });
976 let result = func(input);
977 let handled = !result.propagate || result.default_prevented;
978 self.state.borrow_mut().callbacks.input = Some(func);
979
980 if handled {
981 return Some(0);
982 }
983 } else {
984 drop(lock);
985 };
986
987 // Since these are handled in handle_nc_mouse_up_msg we must prevent the default window proc
988 if button == MouseButton::Left {
989 match wparam.0 as u32 {
990 HTMINBUTTON => self.state.borrow_mut().nc_button_pressed = Some(HTMINBUTTON),
991 HTMAXBUTTON => self.state.borrow_mut().nc_button_pressed = Some(HTMAXBUTTON),
992 HTCLOSE => self.state.borrow_mut().nc_button_pressed = Some(HTCLOSE),
993 _ => return None,
994 };
995 Some(0)
996 } else {
997 None
998 }
999 }
1000
1001 fn handle_nc_mouse_up_msg(
1002 &self,
1003 handle: HWND,
1004 button: MouseButton,
1005 wparam: WPARAM,
1006 lparam: LPARAM,
1007 ) -> Option<isize> {
1008 let mut lock = self.state.borrow_mut();
1009 if let Some(mut func) = lock.callbacks.input.take() {
1010 let scale_factor = lock.scale_factor;
1011 drop(lock);
1012
1013 let mut cursor_point = POINT {
1014 x: lparam.signed_loword().into(),
1015 y: lparam.signed_hiword().into(),
1016 };
1017 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1018 let input = PlatformInput::MouseUp(MouseUpEvent {
1019 button,
1020 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1021 modifiers: current_modifiers(),
1022 click_count: 1,
1023 });
1024 let handled = !func(input).propagate;
1025 self.state.borrow_mut().callbacks.input = Some(func);
1026
1027 if handled {
1028 return Some(0);
1029 }
1030 } else {
1031 drop(lock);
1032 }
1033
1034 let last_pressed = self.state.borrow_mut().nc_button_pressed.take();
1035 if button == MouseButton::Left
1036 && let Some(last_pressed) = last_pressed
1037 {
1038 let handled = match (wparam.0 as u32, last_pressed) {
1039 (HTMINBUTTON, HTMINBUTTON) => {
1040 unsafe { ShowWindowAsync(handle, SW_MINIMIZE).ok().log_err() };
1041 true
1042 }
1043 (HTMAXBUTTON, HTMAXBUTTON) => {
1044 if self.state.borrow().is_maximized() {
1045 unsafe { ShowWindowAsync(handle, SW_NORMAL).ok().log_err() };
1046 } else {
1047 unsafe { ShowWindowAsync(handle, SW_MAXIMIZE).ok().log_err() };
1048 }
1049 true
1050 }
1051 (HTCLOSE, HTCLOSE) => {
1052 unsafe {
1053 PostMessageW(Some(handle), WM_CLOSE, WPARAM::default(), LPARAM::default())
1054 .log_err()
1055 };
1056 true
1057 }
1058 _ => false,
1059 };
1060 if handled {
1061 return Some(0);
1062 }
1063 }
1064
1065 None
1066 }
1067
1068 fn handle_cursor_changed(&self, lparam: LPARAM) -> Option<isize> {
1069 let mut state = self.state.borrow_mut();
1070 let had_cursor = state.current_cursor.is_some();
1071
1072 state.current_cursor = if lparam.0 == 0 {
1073 None
1074 } else {
1075 Some(HCURSOR(lparam.0 as _))
1076 };
1077
1078 if had_cursor != state.current_cursor.is_some() {
1079 unsafe { SetCursor(state.current_cursor) };
1080 }
1081
1082 Some(0)
1083 }
1084
1085 fn handle_set_cursor(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
1086 if unsafe { !IsWindowEnabled(handle).as_bool() }
1087 || matches!(
1088 lparam.loword() as u32,
1089 HTLEFT
1090 | HTRIGHT
1091 | HTTOP
1092 | HTTOPLEFT
1093 | HTTOPRIGHT
1094 | HTBOTTOM
1095 | HTBOTTOMLEFT
1096 | HTBOTTOMRIGHT
1097 )
1098 {
1099 return None;
1100 }
1101 unsafe {
1102 SetCursor(self.state.borrow().current_cursor);
1103 };
1104 Some(1)
1105 }
1106
1107 fn handle_system_settings_changed(
1108 &self,
1109 handle: HWND,
1110 wparam: WPARAM,
1111 lparam: LPARAM,
1112 ) -> Option<isize> {
1113 if wparam.0 != 0 {
1114 let mut lock = self.state.borrow_mut();
1115 let display = lock.display;
1116 lock.click_state.system_update(wparam.0);
1117 lock.border_offset.update(handle).log_err();
1118 // system settings may emit a window message which wants to take the refcell lock, so drop it
1119 drop(lock);
1120 self.system_settings.borrow_mut().update(display, wparam.0);
1121 } else {
1122 self.handle_system_theme_changed(handle, lparam)?;
1123 };
1124 // Force to trigger WM_NCCALCSIZE event to ensure that we handle auto hide
1125 // taskbar correctly.
1126 notify_frame_changed(handle);
1127
1128 Some(0)
1129 }
1130
1131 fn handle_system_command(&self, wparam: WPARAM) -> Option<isize> {
1132 if wparam.0 == SC_KEYMENU as usize {
1133 let mut lock = self.state.borrow_mut();
1134 if lock.system_key_handled {
1135 lock.system_key_handled = false;
1136 return Some(0);
1137 }
1138 }
1139 None
1140 }
1141
1142 fn handle_system_theme_changed(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
1143 // lParam is a pointer to a string that indicates the area containing the system parameter
1144 // that was changed.
1145 let parameter = PCWSTR::from_raw(lparam.0 as _);
1146 if unsafe { !parameter.is_null() && !parameter.is_empty() }
1147 && let Some(parameter_string) = unsafe { parameter.to_string() }.log_err()
1148 {
1149 log::info!("System settings changed: {}", parameter_string);
1150 if parameter_string.as_str() == "ImmersiveColorSet" {
1151 let new_appearance = system_appearance()
1152 .context("unable to get system appearance when handling ImmersiveColorSet")
1153 .log_err()?;
1154 let mut lock = self.state.borrow_mut();
1155 if new_appearance != lock.appearance {
1156 lock.appearance = new_appearance;
1157 let mut callback = lock.callbacks.appearance_changed.take()?;
1158 drop(lock);
1159 callback();
1160 self.state.borrow_mut().callbacks.appearance_changed = Some(callback);
1161 configure_dwm_dark_mode(handle, new_appearance);
1162 }
1163 }
1164 }
1165 Some(0)
1166 }
1167
1168 fn handle_input_language_changed(&self) -> Option<isize> {
1169 unsafe {
1170 PostMessageW(
1171 Some(self.platform_window_handle),
1172 WM_GPUI_KEYBOARD_LAYOUT_CHANGED,
1173 WPARAM(self.validation_number),
1174 LPARAM(0),
1175 )
1176 .log_err();
1177 }
1178 Some(0)
1179 }
1180
1181 fn handle_window_visibility_changed(&self, handle: HWND, wparam: WPARAM) -> Option<isize> {
1182 if wparam.0 == 1 {
1183 self.draw_window(handle, false);
1184 }
1185 None
1186 }
1187
1188 fn handle_device_lost(&self, lparam: LPARAM) -> Option<isize> {
1189 let mut lock = self.state.borrow_mut();
1190 let devices = lparam.0 as *const DirectXDevices;
1191 let devices = unsafe { &*devices };
1192 lock.renderer.handle_device_lost(&devices);
1193 Some(0)
1194 }
1195
1196 #[inline]
1197 fn draw_window(&self, handle: HWND, force_render: bool) -> Option<isize> {
1198 let last_frame = FRAME_INDEX.fetch_add(1, std::sync::atomic::Ordering::SeqCst) % FRAME_RING;
1199 let cur_frame = (last_frame + 1) % FRAME_RING;
1200
1201 let start = Instant::now();
1202 let prev_frame_start = self.frame_start.replace(start);
1203
1204 FRAME_BUF[last_frame].lock().frame_time =
1205 start.duration_since(prev_frame_start).as_secs_f64();
1206 FRAME_BUF[cur_frame].lock().timings.clear();
1207
1208 let mut request_frame = self.state.borrow_mut().callbacks.request_frame.take()?;
1209 request_frame(RequestFrameOptions {
1210 require_presentation: false,
1211 force_render,
1212 });
1213
1214 self.state.borrow_mut().callbacks.request_frame = Some(request_frame);
1215 unsafe { ValidateRect(Some(handle), None).ok().log_err() };
1216
1217 Some(0)
1218 }
1219
1220 #[inline]
1221 fn parse_char_message(&self, wparam: WPARAM) -> Option<String> {
1222 let code_point = wparam.loword();
1223 let mut lock = self.state.borrow_mut();
1224 // https://www.unicode.org/versions/Unicode16.0.0/core-spec/chapter-3/#G2630
1225 match code_point {
1226 0xD800..=0xDBFF => {
1227 // High surrogate, wait for low surrogate
1228 lock.pending_surrogate = Some(code_point);
1229 None
1230 }
1231 0xDC00..=0xDFFF => {
1232 if let Some(high_surrogate) = lock.pending_surrogate.take() {
1233 // Low surrogate, combine with pending high surrogate
1234 String::from_utf16(&[high_surrogate, code_point]).ok()
1235 } else {
1236 // Invalid low surrogate without a preceding high surrogate
1237 log::warn!(
1238 "Received low surrogate without a preceding high surrogate: {code_point:x}"
1239 );
1240 None
1241 }
1242 }
1243 _ => {
1244 lock.pending_surrogate = None;
1245 char::from_u32(code_point as u32)
1246 .filter(|c| !c.is_control())
1247 .map(|c| c.to_string())
1248 }
1249 }
1250 }
1251
1252 fn start_tracking_mouse(&self, handle: HWND, flags: TRACKMOUSEEVENT_FLAGS) {
1253 let mut lock = self.state.borrow_mut();
1254 if !lock.hovered {
1255 lock.hovered = true;
1256 unsafe {
1257 TrackMouseEvent(&mut TRACKMOUSEEVENT {
1258 cbSize: std::mem::size_of::<TRACKMOUSEEVENT>() as u32,
1259 dwFlags: flags,
1260 hwndTrack: handle,
1261 dwHoverTime: HOVER_DEFAULT,
1262 })
1263 .log_err()
1264 };
1265 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
1266 drop(lock);
1267 callback(true);
1268 self.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
1269 }
1270 }
1271 }
1272
1273 fn with_input_handler<F, R>(&self, f: F) -> Option<R>
1274 where
1275 F: FnOnce(&mut PlatformInputHandler) -> R,
1276 {
1277 let mut input_handler = self.state.borrow_mut().input_handler.take()?;
1278 let result = f(&mut input_handler);
1279 self.state.borrow_mut().input_handler = Some(input_handler);
1280 Some(result)
1281 }
1282
1283 fn with_input_handler_and_scale_factor<F, R>(&self, f: F) -> Option<R>
1284 where
1285 F: FnOnce(&mut PlatformInputHandler, f32) -> Option<R>,
1286 {
1287 let mut lock = self.state.borrow_mut();
1288 let mut input_handler = lock.input_handler.take()?;
1289 let scale_factor = lock.scale_factor;
1290 drop(lock);
1291 let result = f(&mut input_handler, scale_factor);
1292 self.state.borrow_mut().input_handler = Some(input_handler);
1293 result
1294 }
1295}
1296
1297#[inline]
1298fn translate_message(handle: HWND, wparam: WPARAM, lparam: LPARAM) {
1299 let msg = MSG {
1300 hwnd: handle,
1301 message: WM_KEYDOWN,
1302 wParam: wparam,
1303 lParam: lparam,
1304 // It seems like leaving the following two parameters empty doesn't break key events, they still work as expected.
1305 // But if any bugs pop up after this PR, this is probably the place to look first.
1306 time: 0,
1307 pt: POINT::default(),
1308 };
1309 unsafe { TranslateMessage(&msg).ok().log_err() };
1310}
1311
1312fn handle_key_event<F>(
1313 handle: HWND,
1314 wparam: WPARAM,
1315 lparam: LPARAM,
1316 state: &mut WindowsWindowState,
1317 f: F,
1318) -> Option<PlatformInput>
1319where
1320 F: FnOnce(Keystroke) -> PlatformInput,
1321{
1322 let virtual_key = VIRTUAL_KEY(wparam.loword());
1323 let modifiers = current_modifiers();
1324
1325 match virtual_key {
1326 VK_SHIFT | VK_CONTROL | VK_MENU | VK_LMENU | VK_RMENU | VK_LWIN | VK_RWIN => {
1327 if state
1328 .last_reported_modifiers
1329 .is_some_and(|prev_modifiers| prev_modifiers == modifiers)
1330 {
1331 return None;
1332 }
1333 state.last_reported_modifiers = Some(modifiers);
1334 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1335 modifiers,
1336 capslock: current_capslock(),
1337 }))
1338 }
1339 VK_PACKET => {
1340 translate_message(handle, wparam, lparam);
1341 None
1342 }
1343 VK_CAPITAL => {
1344 let capslock = current_capslock();
1345 if state
1346 .last_reported_capslock
1347 .is_some_and(|prev_capslock| prev_capslock == capslock)
1348 {
1349 return None;
1350 }
1351 state.last_reported_capslock = Some(capslock);
1352 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1353 modifiers,
1354 capslock,
1355 }))
1356 }
1357 vkey => {
1358 let vkey = if vkey == VK_PROCESSKEY {
1359 VIRTUAL_KEY(unsafe { ImmGetVirtualKey(handle) } as u16)
1360 } else {
1361 vkey
1362 };
1363 let keystroke = parse_normal_key(vkey, lparam, modifiers)?;
1364 Some(f(keystroke))
1365 }
1366 }
1367}
1368
1369fn parse_immutable(vkey: VIRTUAL_KEY) -> Option<String> {
1370 Some(
1371 match vkey {
1372 VK_SPACE => "space",
1373 VK_BACK => "backspace",
1374 VK_RETURN => "enter",
1375 VK_TAB => "tab",
1376 VK_UP => "up",
1377 VK_DOWN => "down",
1378 VK_RIGHT => "right",
1379 VK_LEFT => "left",
1380 VK_HOME => "home",
1381 VK_END => "end",
1382 VK_PRIOR => "pageup",
1383 VK_NEXT => "pagedown",
1384 VK_BROWSER_BACK => "back",
1385 VK_BROWSER_FORWARD => "forward",
1386 VK_ESCAPE => "escape",
1387 VK_INSERT => "insert",
1388 VK_DELETE => "delete",
1389 VK_APPS => "menu",
1390 VK_F1 => "f1",
1391 VK_F2 => "f2",
1392 VK_F3 => "f3",
1393 VK_F4 => "f4",
1394 VK_F5 => "f5",
1395 VK_F6 => "f6",
1396 VK_F7 => "f7",
1397 VK_F8 => "f8",
1398 VK_F9 => "f9",
1399 VK_F10 => "f10",
1400 VK_F11 => "f11",
1401 VK_F12 => "f12",
1402 VK_F13 => "f13",
1403 VK_F14 => "f14",
1404 VK_F15 => "f15",
1405 VK_F16 => "f16",
1406 VK_F17 => "f17",
1407 VK_F18 => "f18",
1408 VK_F19 => "f19",
1409 VK_F20 => "f20",
1410 VK_F21 => "f21",
1411 VK_F22 => "f22",
1412 VK_F23 => "f23",
1413 VK_F24 => "f24",
1414 _ => return None,
1415 }
1416 .to_string(),
1417 )
1418}
1419
1420fn parse_normal_key(
1421 vkey: VIRTUAL_KEY,
1422 lparam: LPARAM,
1423 mut modifiers: Modifiers,
1424) -> Option<Keystroke> {
1425 let mut key_char = None;
1426 let key = parse_immutable(vkey).or_else(|| {
1427 let scan_code = lparam.hiword() & 0xFF;
1428 key_char = generate_key_char(
1429 vkey,
1430 scan_code as u32,
1431 modifiers.control,
1432 modifiers.shift,
1433 modifiers.alt,
1434 );
1435 get_keystroke_key(vkey, scan_code as u32, &mut modifiers)
1436 })?;
1437 Some(Keystroke {
1438 modifiers,
1439 key,
1440 key_char,
1441 })
1442}
1443
1444fn parse_ime_composition_string(ctx: HIMC, comp_type: IME_COMPOSITION_STRING) -> Option<String> {
1445 unsafe {
1446 let string_len = ImmGetCompositionStringW(ctx, comp_type, None, 0);
1447 if string_len >= 0 {
1448 let mut buffer = vec![0u8; string_len as usize + 2];
1449 ImmGetCompositionStringW(
1450 ctx,
1451 comp_type,
1452 Some(buffer.as_mut_ptr() as _),
1453 string_len as _,
1454 );
1455 let wstring = std::slice::from_raw_parts::<u16>(
1456 buffer.as_mut_ptr().cast::<u16>(),
1457 string_len as usize / 2,
1458 );
1459 Some(String::from_utf16_lossy(wstring))
1460 } else {
1461 None
1462 }
1463 }
1464}
1465
1466#[inline]
1467fn retrieve_composition_cursor_position(ctx: HIMC) -> usize {
1468 unsafe { ImmGetCompositionStringW(ctx, GCS_CURSORPOS, None, 0) as usize }
1469}
1470
1471#[inline]
1472fn is_virtual_key_pressed(vkey: VIRTUAL_KEY) -> bool {
1473 unsafe { GetKeyState(vkey.0 as i32) < 0 }
1474}
1475
1476fn keyboard_uses_altgr() -> bool {
1477 use crate::platform::windows::keyboard::WindowsKeyboardLayout;
1478 WindowsKeyboardLayout::new()
1479 .map(|layout| layout.uses_altgr())
1480 .unwrap_or(false)
1481}
1482
1483#[inline]
1484pub(crate) fn current_modifiers() -> Modifiers {
1485 let lmenu_pressed = is_virtual_key_pressed(VK_LMENU);
1486 let rmenu_pressed = is_virtual_key_pressed(VK_RMENU);
1487 let lcontrol_pressed = is_virtual_key_pressed(VK_LCONTROL);
1488
1489 // Only treat right Alt + left Ctrl as AltGr on keyboards that actually use it
1490 let altgr = keyboard_uses_altgr() && rmenu_pressed && lcontrol_pressed;
1491
1492 Modifiers {
1493 control: is_virtual_key_pressed(VK_CONTROL) && !altgr,
1494 alt: (lmenu_pressed || rmenu_pressed) && !altgr,
1495 shift: is_virtual_key_pressed(VK_SHIFT),
1496 platform: is_virtual_key_pressed(VK_LWIN) || is_virtual_key_pressed(VK_RWIN),
1497 function: false,
1498 }
1499}
1500
1501#[inline]
1502pub(crate) fn current_capslock() -> Capslock {
1503 let on = unsafe { GetKeyState(VK_CAPITAL.0 as i32) & 1 } > 0;
1504 Capslock { on }
1505}
1506
1507fn get_client_area_insets(
1508 handle: HWND,
1509 is_maximized: bool,
1510 windows_version: WindowsVersion,
1511) -> RECT {
1512 // For maximized windows, Windows outdents the window rect from the screen's client rect
1513 // by `frame_thickness` on each edge, meaning `insets` must contain `frame_thickness`
1514 // on all sides (including the top) to avoid the client area extending onto adjacent
1515 // monitors.
1516 //
1517 // For non-maximized windows, things become complicated:
1518 //
1519 // - On Windows 10
1520 // The top inset must be zero, since if there is any nonclient area, Windows will draw
1521 // a full native titlebar outside the client area. (This doesn't occur in the maximized
1522 // case.)
1523 //
1524 // - On Windows 11
1525 // The top inset is calculated using an empirical formula that I derived through various
1526 // tests. Without this, the top 1-2 rows of pixels in our window would be obscured.
1527 let dpi = unsafe { GetDpiForWindow(handle) };
1528 let frame_thickness = get_frame_thickness(dpi);
1529 let top_insets = if is_maximized {
1530 frame_thickness
1531 } else {
1532 match windows_version {
1533 WindowsVersion::Win10 => 0,
1534 WindowsVersion::Win11 => (dpi as f32 / USER_DEFAULT_SCREEN_DPI as f32).round() as i32,
1535 }
1536 };
1537 RECT {
1538 left: frame_thickness,
1539 top: top_insets,
1540 right: frame_thickness,
1541 bottom: frame_thickness,
1542 }
1543}
1544
1545// there is some additional non-visible space when talking about window
1546// borders on Windows:
1547// - SM_CXSIZEFRAME: The resize handle.
1548// - SM_CXPADDEDBORDER: Additional border space that isn't part of the resize handle.
1549fn get_frame_thickness(dpi: u32) -> i32 {
1550 let resize_frame_thickness = unsafe { GetSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) };
1551 let padding_thickness = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
1552 resize_frame_thickness + padding_thickness
1553}
1554
1555fn notify_frame_changed(handle: HWND) {
1556 unsafe {
1557 SetWindowPos(
1558 handle,
1559 None,
1560 0,
1561 0,
1562 0,
1563 0,
1564 SWP_FRAMECHANGED
1565 | SWP_NOACTIVATE
1566 | SWP_NOCOPYBITS
1567 | SWP_NOMOVE
1568 | SWP_NOOWNERZORDER
1569 | SWP_NOREPOSITION
1570 | SWP_NOSENDCHANGING
1571 | SWP_NOSIZE
1572 | SWP_NOZORDER,
1573 )
1574 .log_err();
1575 }
1576}