1use std::{rc::Rc, time::Instant};
2
3use ::util::ResultExt;
4use anyhow::Context as _;
5use windows::{
6 Win32::{
7 Foundation::*,
8 Graphics::Gdi::*,
9 System::SystemServices::*,
10 UI::{
11 Controls::*,
12 HiDpi::*,
13 Input::{Ime::*, KeyboardAndMouse::*},
14 WindowsAndMessaging::*,
15 },
16 },
17 core::PCWSTR,
18};
19
20use crate::*;
21
22pub(crate) const WM_GPUI_CURSOR_STYLE_CHANGED: u32 = WM_USER + 1;
23pub(crate) const WM_GPUI_CLOSE_ONE_WINDOW: u32 = WM_USER + 2;
24pub(crate) const WM_GPUI_TASK_DISPATCHED_ON_MAIN_THREAD: u32 = WM_USER + 3;
25pub(crate) const WM_GPUI_DOCK_MENU_ACTION: u32 = WM_USER + 4;
26pub(crate) const WM_GPUI_FORCE_UPDATE_WINDOW: u32 = WM_USER + 5;
27pub(crate) const WM_GPUI_KEYBOARD_LAYOUT_CHANGED: u32 = WM_USER + 6;
28pub(crate) const WM_GPUI_GPU_DEVICE_LOST: u32 = WM_USER + 7;
29
30const SIZE_MOVE_LOOP_TIMER_ID: usize = 1;
31const AUTO_HIDE_TASKBAR_THICKNESS_PX: i32 = 1;
32
33impl WindowsWindowInner {
34 pub(crate) fn handle_msg(
35 self: &Rc<Self>,
36 handle: HWND,
37 msg: u32,
38 wparam: WPARAM,
39 lparam: LPARAM,
40 ) -> LRESULT {
41 let handled = match msg {
42 WM_ACTIVATE => self.handle_activate_msg(wparam),
43 WM_CREATE => self.handle_create_msg(handle),
44 WM_MOVE => self.handle_move_msg(handle, lparam),
45 WM_SIZE => self.handle_size_msg(wparam, lparam),
46 WM_GETMINMAXINFO => self.handle_get_min_max_info_msg(lparam),
47 WM_ENTERSIZEMOVE | WM_ENTERMENULOOP => self.handle_size_move_loop(handle),
48 WM_EXITSIZEMOVE | WM_EXITMENULOOP => self.handle_size_move_loop_exit(handle),
49 WM_TIMER => self.handle_timer_msg(handle, wparam),
50 WM_NCCALCSIZE => self.handle_calc_client_size(handle, wparam, lparam),
51 WM_DPICHANGED => self.handle_dpi_changed_msg(handle, wparam, lparam),
52 WM_DISPLAYCHANGE => self.handle_display_change_msg(handle),
53 WM_NCHITTEST => self.handle_hit_test_msg(handle, msg, wparam, lparam),
54 WM_PAINT => self.handle_paint_msg(handle),
55 WM_CLOSE => self.handle_close_msg(),
56 WM_DESTROY => self.handle_destroy_msg(handle),
57 WM_MOUSEMOVE => self.handle_mouse_move_msg(handle, lparam, wparam),
58 WM_MOUSELEAVE | WM_NCMOUSELEAVE => self.handle_mouse_leave_msg(),
59 WM_NCMOUSEMOVE => self.handle_nc_mouse_move_msg(handle, lparam),
60 // Treat double click as a second single click, since we track the double clicks ourselves.
61 // If you don't interact with any elements, this will fall through to the windows default
62 // behavior of toggling whether the window is maximized.
63 WM_NCLBUTTONDBLCLK | WM_NCLBUTTONDOWN => {
64 self.handle_nc_mouse_down_msg(handle, MouseButton::Left, wparam, lparam)
65 }
66 WM_NCRBUTTONDOWN => {
67 self.handle_nc_mouse_down_msg(handle, MouseButton::Right, wparam, lparam)
68 }
69 WM_NCMBUTTONDOWN => {
70 self.handle_nc_mouse_down_msg(handle, MouseButton::Middle, wparam, lparam)
71 }
72 WM_NCLBUTTONUP => {
73 self.handle_nc_mouse_up_msg(handle, MouseButton::Left, wparam, lparam)
74 }
75 WM_NCRBUTTONUP => {
76 self.handle_nc_mouse_up_msg(handle, MouseButton::Right, wparam, lparam)
77 }
78 WM_NCMBUTTONUP => {
79 self.handle_nc_mouse_up_msg(handle, MouseButton::Middle, wparam, lparam)
80 }
81 WM_LBUTTONDOWN => self.handle_mouse_down_msg(handle, MouseButton::Left, lparam),
82 WM_RBUTTONDOWN => self.handle_mouse_down_msg(handle, MouseButton::Right, lparam),
83 WM_MBUTTONDOWN => self.handle_mouse_down_msg(handle, MouseButton::Middle, lparam),
84 WM_XBUTTONDOWN => {
85 self.handle_xbutton_msg(handle, wparam, lparam, Self::handle_mouse_down_msg)
86 }
87 WM_LBUTTONUP => self.handle_mouse_up_msg(handle, MouseButton::Left, lparam),
88 WM_RBUTTONUP => self.handle_mouse_up_msg(handle, MouseButton::Right, lparam),
89 WM_MBUTTONUP => self.handle_mouse_up_msg(handle, MouseButton::Middle, lparam),
90 WM_XBUTTONUP => {
91 self.handle_xbutton_msg(handle, wparam, lparam, Self::handle_mouse_up_msg)
92 }
93 WM_MOUSEWHEEL => self.handle_mouse_wheel_msg(handle, wparam, lparam),
94 WM_MOUSEHWHEEL => self.handle_mouse_horizontal_wheel_msg(handle, wparam, lparam),
95 WM_SYSKEYDOWN => self.handle_syskeydown_msg(handle, wparam, lparam),
96 WM_SYSKEYUP => self.handle_syskeyup_msg(handle, wparam, lparam),
97 WM_SYSCOMMAND => self.handle_system_command(wparam),
98 WM_KEYDOWN => self.handle_keydown_msg(handle, wparam, lparam),
99 WM_KEYUP => self.handle_keyup_msg(handle, wparam, lparam),
100 WM_CHAR => self.handle_char_msg(wparam),
101 WM_DEADCHAR => self.handle_dead_char_msg(wparam),
102 WM_IME_STARTCOMPOSITION => self.handle_ime_position(handle),
103 WM_IME_COMPOSITION => self.handle_ime_composition(handle, lparam),
104 WM_SETCURSOR => self.handle_set_cursor(handle, lparam),
105 WM_SETTINGCHANGE => self.handle_system_settings_changed(handle, wparam, lparam),
106 WM_INPUTLANGCHANGE => self.handle_input_language_changed(),
107 WM_SHOWWINDOW => self.handle_window_visibility_changed(handle, wparam),
108 WM_GPUI_CURSOR_STYLE_CHANGED => self.handle_cursor_changed(lparam),
109 WM_GPUI_FORCE_UPDATE_WINDOW => self.draw_window(handle, true),
110 WM_GPUI_GPU_DEVICE_LOST => self.handle_device_lost(lparam),
111 _ => None,
112 };
113 if let Some(n) = handled {
114 LRESULT(n)
115 } else {
116 unsafe { DefWindowProcW(handle, msg, wparam, lparam) }
117 }
118 }
119
120 fn handle_move_msg(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
121 let mut lock = self.state.borrow_mut();
122 let origin = logical_point(
123 lparam.signed_loword() as f32,
124 lparam.signed_hiword() as f32,
125 lock.scale_factor,
126 );
127 lock.origin = origin;
128 let size = lock.logical_size;
129 let center_x = origin.x.0 + size.width.0 / 2.;
130 let center_y = origin.y.0 + size.height.0 / 2.;
131 let monitor_bounds = lock.display.bounds();
132 if center_x < monitor_bounds.left().0
133 || center_x > monitor_bounds.right().0
134 || center_y < monitor_bounds.top().0
135 || center_y > monitor_bounds.bottom().0
136 {
137 // center of the window may have moved to another monitor
138 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
139 // minimize the window can trigger this event too, in this case,
140 // monitor is invalid, we do nothing.
141 if !monitor.is_invalid() && lock.display.handle != monitor {
142 // we will get the same monitor if we only have one
143 lock.display = WindowsDisplay::new_with_handle(monitor);
144 }
145 }
146 if let Some(mut callback) = lock.callbacks.moved.take() {
147 drop(lock);
148 callback();
149 self.state.borrow_mut().callbacks.moved = Some(callback);
150 }
151 Some(0)
152 }
153
154 fn handle_get_min_max_info_msg(&self, lparam: LPARAM) -> Option<isize> {
155 let lock = self.state.borrow();
156 let min_size = lock.min_size?;
157 let scale_factor = lock.scale_factor;
158 let boarder_offset = lock.border_offset;
159 drop(lock);
160 unsafe {
161 let minmax_info = &mut *(lparam.0 as *mut MINMAXINFO);
162 minmax_info.ptMinTrackSize.x =
163 min_size.width.scale(scale_factor).0 as i32 + boarder_offset.width_offset;
164 minmax_info.ptMinTrackSize.y =
165 min_size.height.scale(scale_factor).0 as i32 + boarder_offset.height_offset;
166 }
167 Some(0)
168 }
169
170 fn handle_size_msg(&self, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
171 let mut lock = self.state.borrow_mut();
172
173 // Don't resize the renderer when the window is minimized, but record that it was minimized so
174 // that on restore the swap chain can be recreated via `update_drawable_size_even_if_unchanged`.
175 if wparam.0 == SIZE_MINIMIZED as usize {
176 lock.restore_from_minimized = lock.callbacks.request_frame.take();
177 return Some(0);
178 }
179
180 let width = lparam.loword().max(1) as i32;
181 let height = lparam.hiword().max(1) as i32;
182 let new_size = size(DevicePixels(width), DevicePixels(height));
183
184 let scale_factor = lock.scale_factor;
185 let mut should_resize_renderer = false;
186 if lock.restore_from_minimized.is_some() {
187 lock.callbacks.request_frame = lock.restore_from_minimized.take();
188 } else {
189 should_resize_renderer = true;
190 }
191 drop(lock);
192
193 self.handle_size_change(new_size, scale_factor, should_resize_renderer);
194 Some(0)
195 }
196
197 fn handle_size_change(
198 &self,
199 device_size: Size<DevicePixels>,
200 scale_factor: f32,
201 should_resize_renderer: bool,
202 ) {
203 let new_logical_size = device_size.to_pixels(scale_factor);
204 let mut lock = self.state.borrow_mut();
205 lock.logical_size = new_logical_size;
206 if should_resize_renderer {
207 lock.renderer.resize(device_size).log_err();
208 }
209 if let Some(mut callback) = lock.callbacks.resize.take() {
210 drop(lock);
211 callback(new_logical_size, scale_factor);
212 self.state.borrow_mut().callbacks.resize = Some(callback);
213 }
214 }
215
216 fn handle_size_move_loop(&self, handle: HWND) -> Option<isize> {
217 unsafe {
218 let ret = SetTimer(
219 Some(handle),
220 SIZE_MOVE_LOOP_TIMER_ID,
221 USER_TIMER_MINIMUM,
222 None,
223 );
224 if ret == 0 {
225 log::error!(
226 "unable to create timer: {}",
227 std::io::Error::last_os_error()
228 );
229 }
230 }
231 None
232 }
233
234 fn handle_size_move_loop_exit(&self, handle: HWND) -> Option<isize> {
235 unsafe {
236 KillTimer(Some(handle), SIZE_MOVE_LOOP_TIMER_ID).log_err();
237 }
238 None
239 }
240
241 fn handle_timer_msg(&self, handle: HWND, wparam: WPARAM) -> Option<isize> {
242 if wparam.0 == SIZE_MOVE_LOOP_TIMER_ID {
243 drain_main_receiver(&self.main_receiver);
244 self.handle_paint_msg(handle)
245 } else {
246 None
247 }
248 }
249
250 fn handle_paint_msg(&self, handle: HWND) -> Option<isize> {
251 self.draw_window(handle, false)
252 }
253
254 fn handle_close_msg(&self) -> Option<isize> {
255 let mut callback = self.state.borrow_mut().callbacks.should_close.take()?;
256 let should_close = callback();
257 self.state.borrow_mut().callbacks.should_close = Some(callback);
258 if should_close { None } else { Some(0) }
259 }
260
261 fn handle_destroy_msg(&self, handle: HWND) -> Option<isize> {
262 let callback = {
263 let mut lock = self.state.borrow_mut();
264 lock.callbacks.close.take()
265 };
266 if let Some(callback) = callback {
267 callback();
268 }
269 unsafe {
270 PostMessageW(
271 Some(self.platform_window_handle),
272 WM_GPUI_CLOSE_ONE_WINDOW,
273 WPARAM(self.validation_number),
274 LPARAM(handle.0 as isize),
275 )
276 .log_err();
277 }
278 Some(0)
279 }
280
281 fn handle_mouse_move_msg(&self, handle: HWND, lparam: LPARAM, wparam: WPARAM) -> Option<isize> {
282 self.start_tracking_mouse(handle, TME_LEAVE);
283
284 let mut lock = self.state.borrow_mut();
285 let Some(mut func) = lock.callbacks.input.take() else {
286 return Some(1);
287 };
288 let scale_factor = lock.scale_factor;
289 drop(lock);
290
291 let pressed_button = match MODIFIERKEYS_FLAGS(wparam.loword() as u32) {
292 flags if flags.contains(MK_LBUTTON) => Some(MouseButton::Left),
293 flags if flags.contains(MK_RBUTTON) => Some(MouseButton::Right),
294 flags if flags.contains(MK_MBUTTON) => Some(MouseButton::Middle),
295 flags if flags.contains(MK_XBUTTON1) => {
296 Some(MouseButton::Navigate(NavigationDirection::Back))
297 }
298 flags if flags.contains(MK_XBUTTON2) => {
299 Some(MouseButton::Navigate(NavigationDirection::Forward))
300 }
301 _ => None,
302 };
303 let x = lparam.signed_loword() as f32;
304 let y = lparam.signed_hiword() as f32;
305 let input = PlatformInput::MouseMove(MouseMoveEvent {
306 position: logical_point(x, y, scale_factor),
307 pressed_button,
308 modifiers: current_modifiers(),
309 });
310 let handled = !func(input).propagate;
311 self.state.borrow_mut().callbacks.input = Some(func);
312
313 if handled { Some(0) } else { Some(1) }
314 }
315
316 fn handle_mouse_leave_msg(&self) -> Option<isize> {
317 let mut lock = self.state.borrow_mut();
318 lock.hovered = false;
319 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
320 drop(lock);
321 callback(false);
322 self.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
323 }
324
325 Some(0)
326 }
327
328 fn handle_syskeydown_msg(&self, handle: HWND, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
329 let mut lock = self.state.borrow_mut();
330 let input = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
331 PlatformInput::KeyDown(KeyDownEvent {
332 keystroke,
333 is_held: lparam.0 & (0x1 << 30) > 0,
334 })
335 })?;
336 let mut func = lock.callbacks.input.take()?;
337 drop(lock);
338
339 let handled = !func(input).propagate;
340
341 let mut lock = self.state.borrow_mut();
342 lock.callbacks.input = Some(func);
343
344 if handled {
345 lock.system_key_handled = true;
346 Some(0)
347 } else {
348 // we need to call `DefWindowProcW`, or we will lose the system-wide `Alt+F4`, `Alt+{other keys}`
349 // shortcuts.
350 None
351 }
352 }
353
354 fn handle_syskeyup_msg(&self, handle: HWND, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
355 let mut lock = self.state.borrow_mut();
356 let input = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
357 PlatformInput::KeyUp(KeyUpEvent { keystroke })
358 })?;
359 let mut func = lock.callbacks.input.take()?;
360 drop(lock);
361 func(input);
362 self.state.borrow_mut().callbacks.input = Some(func);
363
364 // Always return 0 to indicate that the message was handled, so we could properly handle `ModifiersChanged` event.
365 Some(0)
366 }
367
368 // It's a known bug that you can't trigger `ctrl-shift-0`. See:
369 // https://superuser.com/questions/1455762/ctrl-shift-number-key-combination-has-stopped-working-for-a-few-numbers
370 fn handle_keydown_msg(&self, handle: HWND, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
371 let mut lock = self.state.borrow_mut();
372 let Some(input) = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
373 PlatformInput::KeyDown(KeyDownEvent {
374 keystroke,
375 is_held: lparam.0 & (0x1 << 30) > 0,
376 })
377 }) else {
378 return Some(1);
379 };
380 drop(lock);
381
382 let is_composing = self
383 .with_input_handler(|input_handler| input_handler.marked_text_range())
384 .flatten()
385 .is_some();
386 if is_composing {
387 translate_message(handle, wparam, lparam);
388 return Some(0);
389 }
390
391 let Some(mut func) = self.state.borrow_mut().callbacks.input.take() else {
392 return Some(1);
393 };
394
395 let handled = !func(input).propagate;
396
397 self.state.borrow_mut().callbacks.input = Some(func);
398
399 if handled {
400 Some(0)
401 } else {
402 translate_message(handle, wparam, lparam);
403 Some(1)
404 }
405 }
406
407 fn handle_keyup_msg(&self, handle: HWND, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
408 let mut lock = self.state.borrow_mut();
409 let Some(input) = handle_key_event(handle, wparam, lparam, &mut lock, |keystroke| {
410 PlatformInput::KeyUp(KeyUpEvent { keystroke })
411 }) else {
412 return Some(1);
413 };
414
415 let Some(mut func) = lock.callbacks.input.take() else {
416 return Some(1);
417 };
418 drop(lock);
419
420 let handled = !func(input).propagate;
421 self.state.borrow_mut().callbacks.input = Some(func);
422
423 if handled { Some(0) } else { Some(1) }
424 }
425
426 fn handle_char_msg(&self, wparam: WPARAM) -> Option<isize> {
427 let input = self.parse_char_message(wparam)?;
428 self.with_input_handler(|input_handler| {
429 input_handler.replace_text_in_range(None, &input);
430 });
431
432 Some(0)
433 }
434
435 fn handle_dead_char_msg(&self, wparam: WPARAM) -> Option<isize> {
436 let ch = char::from_u32(wparam.0 as u32)?.to_string();
437 self.with_input_handler(|input_handler| {
438 input_handler.replace_and_mark_text_in_range(None, &ch, None);
439 });
440 None
441 }
442
443 fn handle_mouse_down_msg(
444 &self,
445 handle: HWND,
446 button: MouseButton,
447 lparam: LPARAM,
448 ) -> Option<isize> {
449 unsafe { SetCapture(handle) };
450 let mut lock = self.state.borrow_mut();
451 let Some(mut func) = lock.callbacks.input.take() else {
452 return Some(1);
453 };
454 let x = lparam.signed_loword();
455 let y = lparam.signed_hiword();
456 let physical_point = point(DevicePixels(x as i32), DevicePixels(y as i32));
457 let click_count = lock.click_state.update(button, physical_point);
458 let scale_factor = lock.scale_factor;
459 drop(lock);
460
461 let input = PlatformInput::MouseDown(MouseDownEvent {
462 button,
463 position: logical_point(x as f32, y as f32, scale_factor),
464 modifiers: current_modifiers(),
465 click_count,
466 first_mouse: false,
467 });
468 let handled = !func(input).propagate;
469 self.state.borrow_mut().callbacks.input = Some(func);
470
471 if handled { Some(0) } else { Some(1) }
472 }
473
474 fn handle_mouse_up_msg(
475 &self,
476 _handle: HWND,
477 button: MouseButton,
478 lparam: LPARAM,
479 ) -> Option<isize> {
480 unsafe { ReleaseCapture().log_err() };
481 let mut lock = self.state.borrow_mut();
482 let Some(mut func) = lock.callbacks.input.take() else {
483 return Some(1);
484 };
485 let x = lparam.signed_loword() as f32;
486 let y = lparam.signed_hiword() as f32;
487 let click_count = lock.click_state.current_count;
488 let scale_factor = lock.scale_factor;
489 drop(lock);
490
491 let input = PlatformInput::MouseUp(MouseUpEvent {
492 button,
493 position: logical_point(x, y, scale_factor),
494 modifiers: current_modifiers(),
495 click_count,
496 });
497 let handled = !func(input).propagate;
498 self.state.borrow_mut().callbacks.input = Some(func);
499
500 if handled { Some(0) } else { Some(1) }
501 }
502
503 fn handle_xbutton_msg(
504 &self,
505 handle: HWND,
506 wparam: WPARAM,
507 lparam: LPARAM,
508 handler: impl Fn(&Self, HWND, MouseButton, LPARAM) -> Option<isize>,
509 ) -> Option<isize> {
510 let nav_dir = match wparam.hiword() {
511 XBUTTON1 => NavigationDirection::Back,
512 XBUTTON2 => NavigationDirection::Forward,
513 _ => return Some(1),
514 };
515 handler(self, handle, MouseButton::Navigate(nav_dir), lparam)
516 }
517
518 fn handle_mouse_wheel_msg(
519 &self,
520 handle: HWND,
521 wparam: WPARAM,
522 lparam: LPARAM,
523 ) -> Option<isize> {
524 let modifiers = current_modifiers();
525 let mut lock = self.state.borrow_mut();
526 let Some(mut func) = lock.callbacks.input.take() else {
527 return Some(1);
528 };
529 let scale_factor = lock.scale_factor;
530 let wheel_scroll_amount = match modifiers.shift {
531 true => {
532 self.system_settings
533 .borrow()
534 .mouse_wheel_settings
535 .wheel_scroll_chars
536 }
537 false => {
538 self.system_settings
539 .borrow()
540 .mouse_wheel_settings
541 .wheel_scroll_lines
542 }
543 };
544 drop(lock);
545
546 let wheel_distance =
547 (wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_amount as f32;
548 let mut cursor_point = POINT {
549 x: lparam.signed_loword().into(),
550 y: lparam.signed_hiword().into(),
551 };
552 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
553 let input = PlatformInput::ScrollWheel(ScrollWheelEvent {
554 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
555 delta: ScrollDelta::Lines(match modifiers.shift {
556 true => Point {
557 x: wheel_distance,
558 y: 0.0,
559 },
560 false => Point {
561 y: wheel_distance,
562 x: 0.0,
563 },
564 }),
565 modifiers,
566 touch_phase: TouchPhase::Moved,
567 });
568 let handled = !func(input).propagate;
569 self.state.borrow_mut().callbacks.input = Some(func);
570
571 if handled { Some(0) } else { Some(1) }
572 }
573
574 fn handle_mouse_horizontal_wheel_msg(
575 &self,
576 handle: HWND,
577 wparam: WPARAM,
578 lparam: LPARAM,
579 ) -> Option<isize> {
580 let mut lock = self.state.borrow_mut();
581 let Some(mut func) = lock.callbacks.input.take() else {
582 return Some(1);
583 };
584 let scale_factor = lock.scale_factor;
585 let wheel_scroll_chars = self
586 .system_settings
587 .borrow()
588 .mouse_wheel_settings
589 .wheel_scroll_chars;
590 drop(lock);
591
592 let wheel_distance =
593 (-wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_chars as f32;
594 let mut cursor_point = POINT {
595 x: lparam.signed_loword().into(),
596 y: lparam.signed_hiword().into(),
597 };
598 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
599 let event = PlatformInput::ScrollWheel(ScrollWheelEvent {
600 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
601 delta: ScrollDelta::Lines(Point {
602 x: wheel_distance,
603 y: 0.0,
604 }),
605 modifiers: current_modifiers(),
606 touch_phase: TouchPhase::Moved,
607 });
608 let handled = !func(event).propagate;
609 self.state.borrow_mut().callbacks.input = Some(func);
610
611 if handled { Some(0) } else { Some(1) }
612 }
613
614 fn retrieve_caret_position(&self) -> Option<POINT> {
615 self.with_input_handler_and_scale_factor(|input_handler, scale_factor| {
616 let caret_range = input_handler.selected_text_range(false)?;
617 let caret_position = input_handler.bounds_for_range(caret_range.range)?;
618 Some(POINT {
619 // logical to physical
620 x: (caret_position.origin.x.0 * scale_factor) as i32,
621 y: (caret_position.origin.y.0 * scale_factor) as i32
622 + ((caret_position.size.height.0 * scale_factor) as i32 / 2),
623 })
624 })
625 }
626
627 fn handle_ime_position(&self, handle: HWND) -> Option<isize> {
628 unsafe {
629 let ctx = ImmGetContext(handle);
630
631 let Some(caret_position) = self.retrieve_caret_position() else {
632 return Some(0);
633 };
634 {
635 let config = COMPOSITIONFORM {
636 dwStyle: CFS_POINT,
637 ptCurrentPos: caret_position,
638 ..Default::default()
639 };
640 ImmSetCompositionWindow(ctx, &config as _).ok().log_err();
641 }
642 {
643 let config = CANDIDATEFORM {
644 dwStyle: CFS_CANDIDATEPOS,
645 ptCurrentPos: caret_position,
646 ..Default::default()
647 };
648 ImmSetCandidateWindow(ctx, &config as _).ok().log_err();
649 }
650 ImmReleaseContext(handle, ctx).ok().log_err();
651 Some(0)
652 }
653 }
654
655 fn handle_ime_composition(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
656 let ctx = unsafe { ImmGetContext(handle) };
657 let result = self.handle_ime_composition_inner(ctx, lparam);
658 unsafe { ImmReleaseContext(handle, ctx).ok().log_err() };
659 result
660 }
661
662 fn handle_ime_composition_inner(&self, ctx: HIMC, lparam: LPARAM) -> Option<isize> {
663 let lparam = lparam.0 as u32;
664 if lparam == 0 {
665 // Japanese IME may send this message with lparam = 0, which indicates that
666 // there is no composition string.
667 self.with_input_handler(|input_handler| {
668 input_handler.replace_text_in_range(None, "");
669 })?;
670 Some(0)
671 } else {
672 if lparam & GCS_COMPSTR.0 > 0 {
673 let comp_string = parse_ime_composition_string(ctx, GCS_COMPSTR)?;
674 let caret_pos =
675 (!comp_string.is_empty() && lparam & GCS_CURSORPOS.0 > 0).then(|| {
676 let pos = retrieve_composition_cursor_position(ctx);
677 pos..pos
678 });
679 self.with_input_handler(|input_handler| {
680 input_handler.replace_and_mark_text_in_range(None, &comp_string, caret_pos);
681 })?;
682 }
683 if lparam & GCS_RESULTSTR.0 > 0 {
684 let comp_result = parse_ime_composition_string(ctx, GCS_RESULTSTR)?;
685 self.with_input_handler(|input_handler| {
686 input_handler.replace_text_in_range(None, &comp_result);
687 })?;
688 return Some(0);
689 }
690
691 // currently, we don't care other stuff
692 None
693 }
694 }
695
696 /// SEE: https://learn.microsoft.com/en-us/windows/win32/winmsg/wm-nccalcsize
697 fn handle_calc_client_size(
698 &self,
699 handle: HWND,
700 wparam: WPARAM,
701 lparam: LPARAM,
702 ) -> Option<isize> {
703 if !self.hide_title_bar || self.state.borrow().is_fullscreen() || wparam.0 == 0 {
704 return None;
705 }
706
707 let is_maximized = self.state.borrow().is_maximized();
708 let insets = get_client_area_insets(handle, is_maximized, self.windows_version);
709 // wparam is TRUE so lparam points to an NCCALCSIZE_PARAMS structure
710 let mut params = lparam.0 as *mut NCCALCSIZE_PARAMS;
711 let mut requested_client_rect = unsafe { &mut ((*params).rgrc) };
712
713 requested_client_rect[0].left += insets.left;
714 requested_client_rect[0].top += insets.top;
715 requested_client_rect[0].right -= insets.right;
716 requested_client_rect[0].bottom -= insets.bottom;
717
718 // Fix auto hide taskbar not showing. This solution is based on the approach
719 // used by Chrome. However, it may result in one row of pixels being obscured
720 // in our client area. But as Chrome says, "there seems to be no better solution."
721 if is_maximized
722 && let Some(ref taskbar_position) =
723 self.system_settings.borrow().auto_hide_taskbar_position
724 {
725 // For the auto-hide taskbar, adjust in by 1 pixel on taskbar edge,
726 // so the window isn't treated as a "fullscreen app", which would cause
727 // the taskbar to disappear.
728 match taskbar_position {
729 AutoHideTaskbarPosition::Left => {
730 requested_client_rect[0].left += AUTO_HIDE_TASKBAR_THICKNESS_PX
731 }
732 AutoHideTaskbarPosition::Top => {
733 requested_client_rect[0].top += AUTO_HIDE_TASKBAR_THICKNESS_PX
734 }
735 AutoHideTaskbarPosition::Right => {
736 requested_client_rect[0].right -= AUTO_HIDE_TASKBAR_THICKNESS_PX
737 }
738 AutoHideTaskbarPosition::Bottom => {
739 requested_client_rect[0].bottom -= AUTO_HIDE_TASKBAR_THICKNESS_PX
740 }
741 }
742 }
743
744 Some(0)
745 }
746
747 fn handle_activate_msg(self: &Rc<Self>, wparam: WPARAM) -> Option<isize> {
748 let activated = wparam.loword() > 0;
749 let this = self.clone();
750 self.executor
751 .spawn(async move {
752 let mut lock = this.state.borrow_mut();
753 if let Some(mut func) = lock.callbacks.active_status_change.take() {
754 drop(lock);
755 func(activated);
756 this.state.borrow_mut().callbacks.active_status_change = Some(func);
757 }
758 })
759 .detach();
760
761 None
762 }
763
764 fn handle_create_msg(&self, handle: HWND) -> Option<isize> {
765 if self.hide_title_bar {
766 notify_frame_changed(handle);
767 Some(0)
768 } else {
769 None
770 }
771 }
772
773 fn handle_dpi_changed_msg(
774 &self,
775 handle: HWND,
776 wparam: WPARAM,
777 lparam: LPARAM,
778 ) -> Option<isize> {
779 let new_dpi = wparam.loword() as f32;
780 let mut lock = self.state.borrow_mut();
781 let is_maximized = lock.is_maximized();
782 let new_scale_factor = new_dpi / USER_DEFAULT_SCREEN_DPI as f32;
783 lock.scale_factor = new_scale_factor;
784 lock.border_offset.update(handle).log_err();
785 drop(lock);
786
787 let rect = unsafe { &*(lparam.0 as *const RECT) };
788 let width = rect.right - rect.left;
789 let height = rect.bottom - rect.top;
790 // this will emit `WM_SIZE` and `WM_MOVE` right here
791 // even before this function returns
792 // the new size is handled in `WM_SIZE`
793 unsafe {
794 SetWindowPos(
795 handle,
796 None,
797 rect.left,
798 rect.top,
799 width,
800 height,
801 SWP_NOZORDER | SWP_NOACTIVATE,
802 )
803 .context("unable to set window position after dpi has changed")
804 .log_err();
805 }
806
807 // When maximized, SetWindowPos doesn't send WM_SIZE, so we need to manually
808 // update the size and call the resize callback
809 if is_maximized {
810 let device_size = size(DevicePixels(width), DevicePixels(height));
811 self.handle_size_change(device_size, new_scale_factor, true);
812 }
813
814 Some(0)
815 }
816
817 /// The following conditions will trigger this event:
818 /// 1. The monitor on which the window is located goes offline or changes resolution.
819 /// 2. Another monitor goes offline, is plugged in, or changes resolution.
820 ///
821 /// In either case, the window will only receive information from the monitor on which
822 /// it is located.
823 ///
824 /// For example, in the case of condition 2, where the monitor on which the window is
825 /// located has actually changed nothing, it will still receive this event.
826 fn handle_display_change_msg(&self, handle: HWND) -> Option<isize> {
827 // NOTE:
828 // Even the `lParam` holds the resolution of the screen, we just ignore it.
829 // Because WM_DPICHANGED, WM_MOVE, WM_SIZE will come first, window reposition and resize
830 // are handled there.
831 // So we only care about if monitor is disconnected.
832 let previous_monitor = self.state.borrow().display;
833 if WindowsDisplay::is_connected(previous_monitor.handle) {
834 // we are fine, other display changed
835 return None;
836 }
837 // display disconnected
838 // in this case, the OS will move our window to another monitor, and minimize it.
839 // we deminimize the window and query the monitor after moving
840 unsafe {
841 let _ = ShowWindow(handle, SW_SHOWNORMAL);
842 };
843 let new_monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
844 // all monitors disconnected
845 if new_monitor.is_invalid() {
846 log::error!("No monitor detected!");
847 return None;
848 }
849 let new_display = WindowsDisplay::new_with_handle(new_monitor);
850 self.state.borrow_mut().display = new_display;
851 Some(0)
852 }
853
854 fn handle_hit_test_msg(
855 &self,
856 handle: HWND,
857 msg: u32,
858 wparam: WPARAM,
859 lparam: LPARAM,
860 ) -> Option<isize> {
861 if !self.is_movable || self.state.borrow().is_fullscreen() {
862 return None;
863 }
864
865 let mut lock = self.state.borrow_mut();
866 if let Some(mut callback) = lock.callbacks.hit_test_window_control.take() {
867 drop(lock);
868 let area = callback();
869 self.state.borrow_mut().callbacks.hit_test_window_control = Some(callback);
870 if let Some(area) = area {
871 return match area {
872 WindowControlArea::Drag => Some(HTCAPTION as _),
873 WindowControlArea::Close => Some(HTCLOSE as _),
874 WindowControlArea::Max => Some(HTMAXBUTTON as _),
875 WindowControlArea::Min => Some(HTMINBUTTON as _),
876 };
877 }
878 } else {
879 drop(lock);
880 }
881
882 if !self.hide_title_bar {
883 // If the OS draws the title bar, we don't need to handle hit test messages.
884 return None;
885 }
886
887 // default handler for resize areas
888 let hit = unsafe { DefWindowProcW(handle, msg, wparam, lparam) };
889 if matches!(
890 hit.0 as u32,
891 HTNOWHERE
892 | HTRIGHT
893 | HTLEFT
894 | HTTOPLEFT
895 | HTTOP
896 | HTTOPRIGHT
897 | HTBOTTOMRIGHT
898 | HTBOTTOM
899 | HTBOTTOMLEFT
900 ) {
901 return Some(hit.0);
902 }
903
904 if self.state.borrow().is_fullscreen() {
905 return Some(HTCLIENT as _);
906 }
907
908 let dpi = unsafe { GetDpiForWindow(handle) };
909 let frame_y = unsafe { GetSystemMetricsForDpi(SM_CYFRAME, dpi) };
910
911 let mut cursor_point = POINT {
912 x: lparam.signed_loword().into(),
913 y: lparam.signed_hiword().into(),
914 };
915 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
916 if !self.state.borrow().is_maximized() && cursor_point.y >= 0 && cursor_point.y <= frame_y {
917 return Some(HTTOP as _);
918 }
919
920 Some(HTCLIENT as _)
921 }
922
923 fn handle_nc_mouse_move_msg(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
924 self.start_tracking_mouse(handle, TME_LEAVE | TME_NONCLIENT);
925
926 let mut lock = self.state.borrow_mut();
927 let mut func = lock.callbacks.input.take()?;
928 let scale_factor = lock.scale_factor;
929 drop(lock);
930
931 let mut cursor_point = POINT {
932 x: lparam.signed_loword().into(),
933 y: lparam.signed_hiword().into(),
934 };
935 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
936 let input = PlatformInput::MouseMove(MouseMoveEvent {
937 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
938 pressed_button: None,
939 modifiers: current_modifiers(),
940 });
941 let handled = !func(input).propagate;
942 self.state.borrow_mut().callbacks.input = Some(func);
943
944 if handled { Some(0) } else { None }
945 }
946
947 fn handle_nc_mouse_down_msg(
948 &self,
949 handle: HWND,
950 button: MouseButton,
951 wparam: WPARAM,
952 lparam: LPARAM,
953 ) -> Option<isize> {
954 let mut lock = self.state.borrow_mut();
955 if let Some(mut func) = lock.callbacks.input.take() {
956 let scale_factor = lock.scale_factor;
957 let mut cursor_point = POINT {
958 x: lparam.signed_loword().into(),
959 y: lparam.signed_hiword().into(),
960 };
961 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
962 let physical_point = point(DevicePixels(cursor_point.x), DevicePixels(cursor_point.y));
963 let click_count = lock.click_state.update(button, physical_point);
964 drop(lock);
965
966 let input = PlatformInput::MouseDown(MouseDownEvent {
967 button,
968 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
969 modifiers: current_modifiers(),
970 click_count,
971 first_mouse: false,
972 });
973 let result = func(input);
974 let handled = !result.propagate || result.default_prevented;
975 self.state.borrow_mut().callbacks.input = Some(func);
976
977 if handled {
978 return Some(0);
979 }
980 } else {
981 drop(lock);
982 };
983
984 // Since these are handled in handle_nc_mouse_up_msg we must prevent the default window proc
985 if button == MouseButton::Left {
986 match wparam.0 as u32 {
987 HTMINBUTTON => self.state.borrow_mut().nc_button_pressed = Some(HTMINBUTTON),
988 HTMAXBUTTON => self.state.borrow_mut().nc_button_pressed = Some(HTMAXBUTTON),
989 HTCLOSE => self.state.borrow_mut().nc_button_pressed = Some(HTCLOSE),
990 _ => return None,
991 };
992 Some(0)
993 } else {
994 None
995 }
996 }
997
998 fn handle_nc_mouse_up_msg(
999 &self,
1000 handle: HWND,
1001 button: MouseButton,
1002 wparam: WPARAM,
1003 lparam: LPARAM,
1004 ) -> Option<isize> {
1005 let mut lock = self.state.borrow_mut();
1006 if let Some(mut func) = lock.callbacks.input.take() {
1007 let scale_factor = lock.scale_factor;
1008 drop(lock);
1009
1010 let mut cursor_point = POINT {
1011 x: lparam.signed_loword().into(),
1012 y: lparam.signed_hiword().into(),
1013 };
1014 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1015 let input = PlatformInput::MouseUp(MouseUpEvent {
1016 button,
1017 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1018 modifiers: current_modifiers(),
1019 click_count: 1,
1020 });
1021 let handled = !func(input).propagate;
1022 self.state.borrow_mut().callbacks.input = Some(func);
1023
1024 if handled {
1025 return Some(0);
1026 }
1027 } else {
1028 drop(lock);
1029 }
1030
1031 let last_pressed = self.state.borrow_mut().nc_button_pressed.take();
1032 if button == MouseButton::Left
1033 && let Some(last_pressed) = last_pressed
1034 {
1035 let handled = match (wparam.0 as u32, last_pressed) {
1036 (HTMINBUTTON, HTMINBUTTON) => {
1037 unsafe { ShowWindowAsync(handle, SW_MINIMIZE).ok().log_err() };
1038 true
1039 }
1040 (HTMAXBUTTON, HTMAXBUTTON) => {
1041 if self.state.borrow().is_maximized() {
1042 unsafe { ShowWindowAsync(handle, SW_NORMAL).ok().log_err() };
1043 } else {
1044 unsafe { ShowWindowAsync(handle, SW_MAXIMIZE).ok().log_err() };
1045 }
1046 true
1047 }
1048 (HTCLOSE, HTCLOSE) => {
1049 unsafe {
1050 PostMessageW(Some(handle), WM_CLOSE, WPARAM::default(), LPARAM::default())
1051 .log_err()
1052 };
1053 true
1054 }
1055 _ => false,
1056 };
1057 if handled {
1058 return Some(0);
1059 }
1060 }
1061
1062 None
1063 }
1064
1065 fn handle_cursor_changed(&self, lparam: LPARAM) -> Option<isize> {
1066 let mut state = self.state.borrow_mut();
1067 let had_cursor = state.current_cursor.is_some();
1068
1069 state.current_cursor = if lparam.0 == 0 {
1070 None
1071 } else {
1072 Some(HCURSOR(lparam.0 as _))
1073 };
1074
1075 if had_cursor != state.current_cursor.is_some() {
1076 unsafe { SetCursor(state.current_cursor) };
1077 }
1078
1079 Some(0)
1080 }
1081
1082 fn handle_set_cursor(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
1083 if unsafe { !IsWindowEnabled(handle).as_bool() }
1084 || matches!(
1085 lparam.loword() as u32,
1086 HTLEFT
1087 | HTRIGHT
1088 | HTTOP
1089 | HTTOPLEFT
1090 | HTTOPRIGHT
1091 | HTBOTTOM
1092 | HTBOTTOMLEFT
1093 | HTBOTTOMRIGHT
1094 )
1095 {
1096 return None;
1097 }
1098 unsafe {
1099 SetCursor(self.state.borrow().current_cursor);
1100 };
1101 Some(1)
1102 }
1103
1104 fn handle_system_settings_changed(
1105 &self,
1106 handle: HWND,
1107 wparam: WPARAM,
1108 lparam: LPARAM,
1109 ) -> Option<isize> {
1110 if wparam.0 != 0 {
1111 let mut lock = self.state.borrow_mut();
1112 let display = lock.display;
1113 lock.click_state.system_update(wparam.0);
1114 lock.border_offset.update(handle).log_err();
1115 // system settings may emit a window message which wants to take the refcell lock, so drop it
1116 drop(lock);
1117 self.system_settings.borrow_mut().update(display, wparam.0);
1118 } else {
1119 self.handle_system_theme_changed(handle, lparam)?;
1120 };
1121 // Force to trigger WM_NCCALCSIZE event to ensure that we handle auto hide
1122 // taskbar correctly.
1123 notify_frame_changed(handle);
1124
1125 Some(0)
1126 }
1127
1128 fn handle_system_command(&self, wparam: WPARAM) -> Option<isize> {
1129 if wparam.0 == SC_KEYMENU as usize {
1130 let mut lock = self.state.borrow_mut();
1131 if lock.system_key_handled {
1132 lock.system_key_handled = false;
1133 return Some(0);
1134 }
1135 }
1136 None
1137 }
1138
1139 fn handle_system_theme_changed(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
1140 // lParam is a pointer to a string that indicates the area containing the system parameter
1141 // that was changed.
1142 let parameter = PCWSTR::from_raw(lparam.0 as _);
1143 if unsafe { !parameter.is_null() && !parameter.is_empty() }
1144 && let Some(parameter_string) = unsafe { parameter.to_string() }.log_err()
1145 {
1146 log::info!("System settings changed: {}", parameter_string);
1147 if parameter_string.as_str() == "ImmersiveColorSet" {
1148 let new_appearance = system_appearance()
1149 .context("unable to get system appearance when handling ImmersiveColorSet")
1150 .log_err()?;
1151 let mut lock = self.state.borrow_mut();
1152 if new_appearance != lock.appearance {
1153 lock.appearance = new_appearance;
1154 let mut callback = lock.callbacks.appearance_changed.take()?;
1155 drop(lock);
1156 callback();
1157 self.state.borrow_mut().callbacks.appearance_changed = Some(callback);
1158 configure_dwm_dark_mode(handle, new_appearance);
1159 }
1160 }
1161 }
1162 Some(0)
1163 }
1164
1165 fn handle_input_language_changed(&self) -> Option<isize> {
1166 unsafe {
1167 PostMessageW(
1168 Some(self.platform_window_handle),
1169 WM_GPUI_KEYBOARD_LAYOUT_CHANGED,
1170 WPARAM(self.validation_number),
1171 LPARAM(0),
1172 )
1173 .log_err();
1174 }
1175 Some(0)
1176 }
1177
1178 fn handle_window_visibility_changed(&self, handle: HWND, wparam: WPARAM) -> Option<isize> {
1179 if wparam.0 == 1 {
1180 self.draw_window(handle, false);
1181 }
1182 None
1183 }
1184
1185 fn handle_device_lost(&self, lparam: LPARAM) -> Option<isize> {
1186 let mut lock = self.state.borrow_mut();
1187 let devices = lparam.0 as *const DirectXDevices;
1188 let devices = unsafe { &*devices };
1189 lock.renderer.handle_device_lost(&devices);
1190 Some(0)
1191 }
1192
1193 #[inline]
1194 fn draw_window(&self, handle: HWND, force_render: bool) -> Option<isize> {
1195 let cur_frame = FRAME_INDEX
1196 .fetch_add(1, std::sync::atomic::Ordering::SeqCst)
1197 .overflowing_add(1)
1198 .0
1199 % FRAME_RING;
1200
1201 FRAME_BUF[cur_frame].lock().timings.clear();
1202
1203 let mut request_frame = self.state.borrow_mut().callbacks.request_frame.take()?;
1204 let start = Instant::now();
1205 request_frame(RequestFrameOptions {
1206 require_presentation: false,
1207 force_render,
1208 });
1209 let end = Instant::now();
1210 let duration = end.duration_since(start).as_secs_f64();
1211
1212 self.state.borrow_mut().callbacks.request_frame = Some(request_frame);
1213 unsafe { ValidateRect(Some(handle), None).ok().log_err() };
1214
1215 FRAME_BUF[cur_frame].lock().frame_time = duration;
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}