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tenant.openagents/omega
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events.rs
1use std::{cell::Cell, rc::Rc, sync::atomic::Ordering};
2
3use anyhow::Context as _;
4use gpui_util::ResultExt;
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::*;
21use gpui::*;
22
23pub(crate) const WM_GPUI_CURSOR_STYLE_CHANGED: u32 = WM_USER + 1;
24pub(crate) const WM_GPUI_CLOSE_ONE_WINDOW: u32 = WM_USER + 2;
25pub(crate) const WM_GPUI_TASK_DISPATCHED_ON_MAIN_THREAD: u32 = WM_USER + 3;
26pub(crate) const WM_GPUI_DOCK_MENU_ACTION: u32 = WM_USER + 4;
27pub(crate) const WM_GPUI_FORCE_UPDATE_WINDOW: u32 = WM_USER + 5;
28pub(crate) const WM_GPUI_KEYBOARD_LAYOUT_CHANGED: u32 = WM_USER + 6;
29pub(crate) const WM_GPUI_GPU_DEVICE_LOST: u32 = WM_USER + 7;
30pub(crate) const WM_GPUI_KEYDOWN: u32 = WM_USER + 8;
31
32const SIZE_MOVE_LOOP_TIMER_ID: usize = 1;
33
34/// Coordinates window draws on the UI thread. Owned by the platform and
35/// shared with every window (like `WindowsPlatformState::cursor_visible`),
36/// because the coordination is inherently cross-window: while window A is
37/// drawing, a re-entrant paint request for window B must be deferred.
38pub(crate) struct DrawCoordinator {
39 /// Whether some window is currently inside `draw_window`. Win32 can
40 /// re-enter the window procedure while a draw is in progress (e.g.
41 /// cross-thread `SendMessage` dispatch during message pumping, or modal
42 /// message loops entered by COM calls), and drawing re-entrantly would
43 /// nest GPUI draws. Nested draws are wasted work whose output is
44 /// immediately redrawn, so we defer them instead.
45 drawing: Cell<bool>,
46}
47
48impl DrawCoordinator {
49 pub(crate) fn new() -> Self {
50 Self {
51 drawing: Cell::new(false),
52 }
53 }
54
55 fn try_begin_draw(&self) -> Option<DrawWindowGuard<'_>> {
56 // This only covers the `draw_window` span (which extends past the GPUI
57 // draw, through presentation and IME updates). Requests that arrive
58 // re-entrantly during GPUI-initiated draws (e.g. key dispatch or
59 // opening a window draws synchronously) are deferred by GPUI's
60 // `on_request_frame` callback itself, which no-ops in that case.
61 if self.drawing.get() {
62 None
63 } else {
64 self.drawing.set(true);
65 Some(DrawWindowGuard { coordinator: self })
66 }
67 }
68}
69
70struct DrawWindowGuard<'a> {
71 coordinator: &'a DrawCoordinator,
72}
73
74impl Drop for DrawWindowGuard<'_> {
75 fn drop(&mut self) {
76 self.coordinator.drawing.set(false);
77 }
78}
79
80impl WindowsWindowInner {
81 pub(crate) fn handle_msg(
82 self: &Rc<Self>,
83 handle: HWND,
84 msg: u32,
85 wparam: WPARAM,
86 lparam: LPARAM,
87 ) -> LRESULT {
88 let handled = match msg {
89 // eagerly activate the window, so calls to `active_window` will work correctly
90 WM_MOUSEACTIVATE => {
91 unsafe { SetActiveWindow(handle).ok() };
92 None
93 }
94 WM_ACTIVATE => self.handle_activate_msg(wparam),
95 WM_CREATE => self.handle_create_msg(handle),
96 WM_MOVE => self.handle_move_msg(handle, lparam),
97 WM_SIZE => self.handle_size_msg(wparam, lparam),
98 WM_GETMINMAXINFO => self.handle_get_min_max_info_msg(lparam),
99 WM_ENTERSIZEMOVE | WM_ENTERMENULOOP => self.handle_size_move_loop(handle),
100 WM_EXITSIZEMOVE | WM_EXITMENULOOP => self.handle_size_move_loop_exit(handle),
101 WM_TIMER => self.handle_timer_msg(handle, wparam),
102 WM_NCCALCSIZE => self.handle_calc_client_size(handle, wparam, lparam),
103 WM_DPICHANGED => self.handle_dpi_changed_msg(handle, wparam, lparam),
104 WM_DISPLAYCHANGE => self.handle_display_change_msg(handle),
105 WM_NCHITTEST => self.handle_hit_test_msg(handle, lparam),
106 WM_PAINT => self.handle_paint_msg(handle),
107 WM_CLOSE => self.handle_close_msg(),
108 WM_DESTROY => self.handle_destroy_msg(handle),
109 WM_MOUSEMOVE => self.handle_mouse_move_msg(handle, lparam, wparam),
110 WM_MOUSELEAVE | WM_NCMOUSELEAVE => self.handle_mouse_leave_msg(),
111 WM_NCMOUSEMOVE => self.handle_nc_mouse_move_msg(handle, lparam),
112 // Treat double click as a second single click, since we track the double clicks ourselves.
113 // If you don't interact with any elements, this will fall through to the windows default
114 // behavior of toggling whether the window is maximized.
115 WM_NCLBUTTONDBLCLK | WM_NCLBUTTONDOWN => {
116 self.handle_nc_mouse_down_msg(handle, MouseButton::Left, wparam, lparam)
117 }
118 WM_NCRBUTTONDOWN => {
119 self.handle_nc_mouse_down_msg(handle, MouseButton::Right, wparam, lparam)
120 }
121 WM_NCMBUTTONDOWN => {
122 self.handle_nc_mouse_down_msg(handle, MouseButton::Middle, wparam, lparam)
123 }
124 WM_NCLBUTTONUP => {
125 self.handle_nc_mouse_up_msg(handle, MouseButton::Left, wparam, lparam)
126 }
127 WM_NCRBUTTONUP => {
128 self.handle_nc_mouse_up_msg(handle, MouseButton::Right, wparam, lparam)
129 }
130 WM_NCMBUTTONUP => {
131 self.handle_nc_mouse_up_msg(handle, MouseButton::Middle, wparam, lparam)
132 }
133 WM_LBUTTONDOWN => self.handle_mouse_down_msg(handle, MouseButton::Left, lparam),
134 WM_RBUTTONDOWN => self.handle_mouse_down_msg(handle, MouseButton::Right, lparam),
135 WM_MBUTTONDOWN => self.handle_mouse_down_msg(handle, MouseButton::Middle, lparam),
136 WM_XBUTTONDOWN => {
137 self.handle_xbutton_msg(handle, wparam, lparam, Self::handle_mouse_down_msg)
138 }
139 WM_LBUTTONUP => self.handle_mouse_up_msg(handle, MouseButton::Left, lparam),
140 WM_RBUTTONUP => self.handle_mouse_up_msg(handle, MouseButton::Right, lparam),
141 WM_MBUTTONUP => self.handle_mouse_up_msg(handle, MouseButton::Middle, lparam),
142 WM_XBUTTONUP => {
143 self.handle_xbutton_msg(handle, wparam, lparam, Self::handle_mouse_up_msg)
144 }
145 WM_MOUSEWHEEL => self.handle_mouse_wheel_msg(handle, wparam, lparam),
146 WM_MOUSEHWHEEL => self.handle_mouse_horizontal_wheel_msg(handle, wparam, lparam),
147 WM_SYSKEYUP => self.handle_syskeyup_msg(wparam, lparam),
148 WM_KEYUP => self.handle_keyup_msg(wparam, lparam),
149 WM_GPUI_KEYDOWN => self.handle_keydown_msg(wparam, lparam),
150 WM_CHAR => self.handle_char_msg(wparam),
151 WM_IME_STARTCOMPOSITION => self.handle_ime_position(handle),
152 WM_IME_COMPOSITION => self.handle_ime_composition(handle, lparam),
153 WM_SETCURSOR => self.handle_set_cursor(handle, lparam),
154 WM_SETTINGCHANGE => self.handle_system_settings_changed(handle, wparam, lparam),
155 WM_INPUTLANGCHANGE => self.handle_input_language_changed(),
156 WM_SHOWWINDOW => self.handle_window_visibility_changed(handle, wparam),
157 WM_GPUI_CURSOR_STYLE_CHANGED => self.handle_cursor_changed(lparam),
158 WM_GPUI_FORCE_UPDATE_WINDOW => self.draw_window(handle, true),
159 WM_GPUI_GPU_DEVICE_LOST => self.handle_device_lost(lparam),
160 DM_POINTERHITTEST => self.handle_dm_pointer_hit_test(wparam),
161 WM_GETOBJECT => self.handle_wm_getobject(wparam, lparam),
162 _ => None,
163 };
164 if let Some(n) = handled {
165 LRESULT(n)
166 } else {
167 unsafe { DefWindowProcW(handle, msg, wparam, lparam) }
168 }
169 }
170
171 fn handle_move_msg(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
172 let origin = logical_point(
173 lparam.signed_loword() as f32,
174 lparam.signed_hiword() as f32,
175 self.state.scale_factor.get(),
176 );
177 self.state.origin.set(origin);
178 let size = self.state.logical_size.get();
179 let center_x = origin.x.as_f32() + size.width.as_f32() / 2.;
180 let center_y = origin.y.as_f32() + size.height.as_f32() / 2.;
181 let monitor_bounds = self.state.display.get().bounds();
182 if center_x < monitor_bounds.left().as_f32()
183 || center_x > monitor_bounds.right().as_f32()
184 || center_y < monitor_bounds.top().as_f32()
185 || center_y > monitor_bounds.bottom().as_f32()
186 {
187 // center of the window may have moved to another monitor
188 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
189 // minimize the window can trigger this event too, in this case,
190 // monitor is invalid, we do nothing.
191 if !monitor.is_invalid() && self.state.display.get().handle != monitor {
192 // we will get the same monitor if we only have one
193 self.state.display.set(WindowsDisplay::new(
194 WindowsDisplay::display_id_for_monitor(monitor),
195 )?);
196 }
197 }
198 if let Some(mut callback) = self.state.callbacks.moved.take() {
199 callback();
200 self.state.callbacks.moved.set(Some(callback));
201 }
202 Some(0)
203 }
204
205 fn handle_get_min_max_info_msg(&self, lparam: LPARAM) -> Option<isize> {
206 let min_size = self.state.min_size?;
207 let scale_factor = self.state.scale_factor.get();
208 let boarder_offset = &self.state.border_offset;
209
210 unsafe {
211 let minmax_info = &mut *(lparam.0 as *mut MINMAXINFO);
212 minmax_info.ptMinTrackSize.x = min_size.width.scale(scale_factor).as_f32() as i32
213 + boarder_offset.width_offset.get();
214 minmax_info.ptMinTrackSize.y = min_size.height.scale(scale_factor).as_f32() as i32
215 + boarder_offset.height_offset.get();
216 }
217 Some(0)
218 }
219
220 fn handle_size_msg(&self, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
221 // Don't resize the renderer when the window is minimized, but record that it was minimized so
222 // that on restore the swap chain can be recreated via `update_drawable_size_even_if_unchanged`.
223 if wparam.0 == SIZE_MINIMIZED as usize {
224 self.state
225 .restore_from_minimized
226 .set(self.state.callbacks.request_frame.take());
227 return Some(0);
228 }
229
230 let width = lparam.loword().max(1) as i32;
231 let height = lparam.hiword().max(1) as i32;
232 let new_size = size(DevicePixels(width), DevicePixels(height));
233
234 let scale_factor = self.state.scale_factor.get();
235 let mut should_resize_renderer = false;
236 if let Some(restore_from_minimized) = self.state.restore_from_minimized.take() {
237 self.state
238 .callbacks
239 .request_frame
240 .set(Some(restore_from_minimized));
241 } else {
242 should_resize_renderer = true;
243 }
244
245 self.handle_size_change(new_size, scale_factor, should_resize_renderer);
246 Some(0)
247 }
248
249 fn handle_size_change(
250 &self,
251 device_size: Size<DevicePixels>,
252 scale_factor: f32,
253 should_resize_renderer: bool,
254 ) {
255 let new_logical_size = device_size.to_pixels(scale_factor);
256
257 self.state.logical_size.set(new_logical_size);
258 if should_resize_renderer
259 && let Err(e) = self.state.renderer.borrow_mut().resize(device_size)
260 {
261 log::error!("Failed to resize renderer, invalidating devices: {}", e);
262 self.state
263 .invalidate_devices
264 .store(true, std::sync::atomic::Ordering::Release);
265 }
266 if let Some(mut callback) = self.state.callbacks.resize.take() {
267 callback(new_logical_size, scale_factor);
268 self.state.callbacks.resize.set(Some(callback));
269 }
270 }
271
272 fn handle_size_move_loop(&self, handle: HWND) -> Option<isize> {
273 unsafe {
274 let ret = SetTimer(
275 Some(handle),
276 SIZE_MOVE_LOOP_TIMER_ID,
277 USER_TIMER_MINIMUM,
278 None,
279 );
280 if ret == 0 {
281 log::error!(
282 "unable to create timer: {}",
283 std::io::Error::last_os_error()
284 );
285 }
286 }
287 None
288 }
289
290 fn handle_size_move_loop_exit(&self, handle: HWND) -> Option<isize> {
291 unsafe {
292 KillTimer(Some(handle), SIZE_MOVE_LOOP_TIMER_ID).log_err();
293 }
294 None
295 }
296
297 fn handle_timer_msg(&self, handle: HWND, wparam: WPARAM) -> Option<isize> {
298 if wparam.0 == SIZE_MOVE_LOOP_TIMER_ID {
299 let mut runnables = self.main_receiver.clone().try_iter();
300 while let Some(Ok(runnable)) = runnables.next() {
301 WindowsDispatcher::execute_runnable(runnable);
302 }
303 self.handle_paint_msg(handle)
304 } else {
305 None
306 }
307 }
308
309 fn handle_paint_msg(&self, handle: HWND) -> Option<isize> {
310 self.draw_window(handle, false)
311 }
312
313 fn handle_close_msg(&self) -> Option<isize> {
314 let mut callback = self.state.callbacks.should_close.take()?;
315 let should_close = callback();
316 self.state.callbacks.should_close.set(Some(callback));
317 if should_close { None } else { Some(0) }
318 }
319
320 fn handle_destroy_msg(&self, handle: HWND) -> Option<isize> {
321 let callback = { self.state.callbacks.close.take() };
322 // Re-enable parent window if this was a modal dialog
323 if let Some(parent_hwnd) = self.parent_hwnd {
324 unsafe {
325 let _ = EnableWindow(parent_hwnd, true);
326 let _ = SetForegroundWindow(parent_hwnd);
327 }
328 }
329
330 if let Some(callback) = callback {
331 callback();
332 }
333 unsafe {
334 PostMessageW(
335 Some(self.platform_window_handle),
336 WM_GPUI_CLOSE_ONE_WINDOW,
337 WPARAM(self.validation_number),
338 LPARAM(handle.0 as isize),
339 )
340 .log_err();
341 }
342 Some(0)
343 }
344
345 fn handle_mouse_move_msg(&self, handle: HWND, lparam: LPARAM, wparam: WPARAM) -> Option<isize> {
346 self.start_tracking_mouse(handle, TME_LEAVE);
347 self.restore_cursor_after_hide();
348
349 let Some(mut func) = self.state.callbacks.input.take() else {
350 return Some(1);
351 };
352 let scale_factor = self.state.scale_factor.get();
353
354 let pressed_button = match MODIFIERKEYS_FLAGS(wparam.loword() as u32) {
355 flags if flags.contains(MK_LBUTTON) => Some(MouseButton::Left),
356 flags if flags.contains(MK_RBUTTON) => Some(MouseButton::Right),
357 flags if flags.contains(MK_MBUTTON) => Some(MouseButton::Middle),
358 flags if flags.contains(MK_XBUTTON1) => {
359 Some(MouseButton::Navigate(NavigationDirection::Back))
360 }
361 flags if flags.contains(MK_XBUTTON2) => {
362 Some(MouseButton::Navigate(NavigationDirection::Forward))
363 }
364 _ => None,
365 };
366 let x = lparam.signed_loword() as f32;
367 let y = lparam.signed_hiword() as f32;
368 let input = PlatformInput::MouseMove(MouseMoveEvent {
369 position: logical_point(x, y, scale_factor),
370 pressed_button,
371 modifiers: current_modifiers(),
372 });
373 let handled = !func(input).propagate;
374 self.state.callbacks.input.set(Some(func));
375
376 if handled { Some(0) } else { Some(1) }
377 }
378
379 fn handle_mouse_leave_msg(&self) -> Option<isize> {
380 self.state.hovered.set(false);
381 // The next window's `WM_SETCURSOR` picks its own cursor, so we just clear
382 // the flag for tight `is_cursor_visible()` semantics.
383 self.state.cursor_visible.store(true, Ordering::Relaxed);
384 if let Some(mut callback) = self.state.callbacks.hovered_status_change.take() {
385 callback(false);
386 self.state
387 .callbacks
388 .hovered_status_change
389 .set(Some(callback));
390 }
391
392 Some(0)
393 }
394
395 fn handle_syskeyup_msg(&self, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
396 let input = handle_key_event(wparam, lparam, &self.state, |keystroke, _| {
397 PlatformInput::KeyUp(KeyUpEvent { keystroke })
398 })?;
399 let mut func = self.state.callbacks.input.take()?;
400
401 func(input);
402 self.state.callbacks.input.set(Some(func));
403
404 // Always return 0 to indicate that the message was handled, so we could properly handle `ModifiersChanged` event.
405 Some(0)
406 }
407
408 // It's a known bug that you can't trigger `ctrl-shift-0`. See:
409 // https://superuser.com/questions/1455762/ctrl-shift-number-key-combination-has-stopped-working-for-a-few-numbers
410 fn handle_keydown_msg(&self, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
411 let Some(input) = handle_key_event(
412 wparam,
413 lparam,
414 &self.state,
415 |keystroke, prefer_character_input| {
416 PlatformInput::KeyDown(KeyDownEvent {
417 keystroke,
418 is_held: lparam.0 & (0x1 << 30) > 0,
419 prefer_character_input,
420 })
421 },
422 ) else {
423 return Some(1);
424 };
425
426 let Some(mut func) = self.state.callbacks.input.take() else {
427 return Some(1);
428 };
429
430 let handled = !func(input).propagate;
431
432 self.state.callbacks.input.set(Some(func));
433
434 if handled { Some(0) } else { Some(1) }
435 }
436
437 fn handle_keyup_msg(&self, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
438 let Some(input) = handle_key_event(wparam, lparam, &self.state, |keystroke, _| {
439 PlatformInput::KeyUp(KeyUpEvent { keystroke })
440 }) else {
441 return Some(1);
442 };
443
444 let Some(mut func) = self.state.callbacks.input.take() else {
445 return Some(1);
446 };
447
448 let handled = !func(input).propagate;
449 self.state.callbacks.input.set(Some(func));
450
451 if handled { Some(0) } else { Some(1) }
452 }
453
454 fn handle_char_msg(&self, wparam: WPARAM) -> Option<isize> {
455 let input = self.parse_char_message(wparam)?;
456 self.with_input_handler(|input_handler| {
457 input_handler.replace_text_in_range(None, &input);
458 });
459
460 Some(0)
461 }
462
463 fn handle_mouse_down_msg(
464 &self,
465 handle: HWND,
466 button: MouseButton,
467 lparam: LPARAM,
468 ) -> Option<isize> {
469 unsafe { SetCapture(handle) };
470
471 let Some(mut func) = self.state.callbacks.input.take() else {
472 return Some(1);
473 };
474 let x = lparam.signed_loword();
475 let y = lparam.signed_hiword();
476 let physical_point = point(DevicePixels(x as i32), DevicePixels(y as i32));
477 let click_count = self.state.click_state.update(button, physical_point);
478 let scale_factor = self.state.scale_factor.get();
479
480 let input = PlatformInput::MouseDown(MouseDownEvent {
481 button,
482 position: logical_point(x as f32, y as f32, scale_factor),
483 modifiers: current_modifiers(),
484 click_count,
485 first_mouse: false,
486 });
487 let handled = !func(input).propagate;
488 self.state.callbacks.input.set(Some(func));
489
490 if handled { Some(0) } else { Some(1) }
491 }
492
493 fn handle_mouse_up_msg(
494 &self,
495 _handle: HWND,
496 button: MouseButton,
497 lparam: LPARAM,
498 ) -> Option<isize> {
499 unsafe { ReleaseCapture().log_err() };
500
501 let Some(mut func) = self.state.callbacks.input.take() else {
502 return Some(1);
503 };
504 let x = lparam.signed_loword() as f32;
505 let y = lparam.signed_hiword() as f32;
506 let click_count = self.state.click_state.current_count.get();
507 let scale_factor = self.state.scale_factor.get();
508
509 let input = PlatformInput::MouseUp(MouseUpEvent {
510 button,
511 position: logical_point(x, y, scale_factor),
512 modifiers: current_modifiers(),
513 click_count,
514 });
515 let handled = !func(input).propagate;
516 self.state.callbacks.input.set(Some(func));
517
518 if handled { Some(0) } else { Some(1) }
519 }
520
521 fn handle_xbutton_msg(
522 &self,
523 handle: HWND,
524 wparam: WPARAM,
525 lparam: LPARAM,
526 handler: impl Fn(&Self, HWND, MouseButton, LPARAM) -> Option<isize>,
527 ) -> Option<isize> {
528 let nav_dir = match wparam.hiword() {
529 XBUTTON1 => NavigationDirection::Back,
530 XBUTTON2 => NavigationDirection::Forward,
531 _ => return Some(1),
532 };
533 handler(self, handle, MouseButton::Navigate(nav_dir), lparam)
534 }
535
536 fn handle_mouse_wheel_msg(
537 &self,
538 handle: HWND,
539 wparam: WPARAM,
540 lparam: LPARAM,
541 ) -> Option<isize> {
542 let modifiers = current_modifiers();
543
544 let Some(mut func) = self.state.callbacks.input.take() else {
545 return Some(1);
546 };
547 let scale_factor = self.state.scale_factor.get();
548 let wheel_scroll_amount = match modifiers.shift {
549 true => self
550 .system_settings()
551 .mouse_wheel_settings
552 .wheel_scroll_chars
553 .get(),
554 false => self
555 .system_settings()
556 .mouse_wheel_settings
557 .wheel_scroll_lines
558 .get(),
559 };
560
561 let wheel_distance =
562 (wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_amount as f32;
563 let mut cursor_point = POINT {
564 x: lparam.signed_loword().into(),
565 y: lparam.signed_hiword().into(),
566 };
567 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
568 let input = PlatformInput::ScrollWheel(ScrollWheelEvent {
569 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
570 delta: ScrollDelta::Lines(match modifiers.shift {
571 true => Point {
572 x: wheel_distance,
573 y: 0.0,
574 },
575 false => Point {
576 y: wheel_distance,
577 x: 0.0,
578 },
579 }),
580 modifiers,
581 touch_phase: TouchPhase::Moved,
582 });
583 let handled = !func(input).propagate;
584 self.state.callbacks.input.set(Some(func));
585
586 if handled { Some(0) } else { Some(1) }
587 }
588
589 fn handle_mouse_horizontal_wheel_msg(
590 &self,
591 handle: HWND,
592 wparam: WPARAM,
593 lparam: LPARAM,
594 ) -> Option<isize> {
595 let Some(mut func) = self.state.callbacks.input.take() else {
596 return Some(1);
597 };
598 let scale_factor = self.state.scale_factor.get();
599 let wheel_scroll_chars = self
600 .system_settings()
601 .mouse_wheel_settings
602 .wheel_scroll_chars
603 .get();
604
605 let wheel_distance =
606 (-wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_chars as f32;
607 let mut cursor_point = POINT {
608 x: lparam.signed_loword().into(),
609 y: lparam.signed_hiword().into(),
610 };
611 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
612 let event = PlatformInput::ScrollWheel(ScrollWheelEvent {
613 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
614 delta: ScrollDelta::Lines(Point {
615 x: wheel_distance,
616 y: 0.0,
617 }),
618 modifiers: current_modifiers(),
619 touch_phase: TouchPhase::Moved,
620 });
621 let handled = !func(event).propagate;
622 self.state.callbacks.input.set(Some(func));
623
624 if handled { Some(0) } else { Some(1) }
625 }
626
627 fn retrieve_caret_position(&self) -> Option<POINT> {
628 self.with_input_handler_and_scale_factor(|input_handler, scale_factor| {
629 let caret_range = input_handler.selected_text_range(false)?;
630 let caret_position = input_handler.bounds_for_range(caret_range.range)?;
631 Some(POINT {
632 // logical to physical
633 x: (caret_position.origin.x.as_f32() * scale_factor) as i32,
634 y: (caret_position.origin.y.as_f32() * scale_factor) as i32
635 + ((caret_position.size.height.as_f32() * scale_factor) as i32 / 2),
636 })
637 })
638 }
639
640 fn handle_ime_position(&self, handle: HWND) -> Option<isize> {
641 if let Some(caret_position) = self.retrieve_caret_position() {
642 self.update_ime_position(handle, caret_position);
643 }
644 Some(0)
645 }
646
647 pub(crate) fn update_ime_position(&self, handle: HWND, caret_position: POINT) {
648 let Some(ctx) = ImeContext::get(handle) else {
649 return;
650 };
651 unsafe {
652 ImmSetCompositionWindow(
653 *ctx,
654 &COMPOSITIONFORM {
655 dwStyle: CFS_POINT,
656 ptCurrentPos: caret_position,
657 ..Default::default()
658 },
659 )
660 .ok()
661 .log_err();
662
663 ImmSetCandidateWindow(
664 *ctx,
665 &CANDIDATEFORM {
666 dwStyle: CFS_CANDIDATEPOS,
667 ptCurrentPos: caret_position,
668 ..Default::default()
669 },
670 )
671 .ok()
672 .log_err();
673 }
674 }
675
676 fn update_ime_enabled(&self, handle: HWND) {
677 let ime_enabled = self
678 .with_input_handler(|input_handler| input_handler.query_accepts_text_input())
679 .unwrap_or(false);
680 if ime_enabled == self.state.ime_enabled.get() {
681 return;
682 }
683 self.state.ime_enabled.set(ime_enabled);
684 unsafe {
685 if ime_enabled {
686 ImmAssociateContextEx(handle, HIMC::default(), IACE_DEFAULT)
687 .ok()
688 .log_err();
689 } else {
690 if let Some(ctx) = ImeContext::get(handle) {
691 ImmNotifyIME(*ctx, NI_COMPOSITIONSTR, CPS_COMPLETE, 0)
692 .ok()
693 .log_err();
694 }
695 ImmAssociateContextEx(handle, HIMC::default(), 0)
696 .ok()
697 .log_err();
698 }
699 }
700 }
701
702 fn handle_ime_composition(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
703 let ctx = ImeContext::get(handle)?;
704 self.handle_ime_composition_inner(*ctx, lparam)
705 }
706
707 fn handle_ime_composition_inner(&self, ctx: HIMC, lparam: LPARAM) -> Option<isize> {
708 let lparam = lparam.0 as u32;
709 if lparam == 0 {
710 // Japanese IME may send this message with lparam = 0, which indicates that
711 // there is no composition string.
712 self.with_input_handler(|input_handler| {
713 input_handler.replace_text_in_range(None, "");
714 })?;
715 Some(0)
716 } else {
717 if lparam & GCS_RESULTSTR.0 > 0 {
718 let comp_result = parse_ime_composition_string(ctx, GCS_RESULTSTR)?;
719 self.with_input_handler(|input_handler| {
720 input_handler
721 .replace_text_in_range(None, &String::from_utf16_lossy(&comp_result));
722 })?;
723 }
724 if lparam & GCS_COMPSTR.0 > 0 {
725 let comp_string = parse_ime_composition_string(ctx, GCS_COMPSTR)?;
726 let caret_pos =
727 (!comp_string.is_empty() && lparam & GCS_CURSORPOS.0 > 0).then(|| {
728 let cursor_pos = retrieve_composition_cursor_position(ctx);
729 let pos = if should_use_ime_cursor_position(ctx, cursor_pos) {
730 cursor_pos
731 } else {
732 comp_string.len()
733 };
734 pos..pos
735 });
736 self.with_input_handler(|input_handler| {
737 input_handler.replace_and_mark_text_in_range(
738 None,
739 &String::from_utf16_lossy(&comp_string),
740 caret_pos,
741 );
742 })?;
743 }
744 if lparam & (GCS_RESULTSTR.0 | GCS_COMPSTR.0) > 0 {
745 return Some(0);
746 }
747
748 // currently, we don't care other stuff
749 None
750 }
751 }
752
753 fn handle_calc_client_size(
754 &self,
755 handle: HWND,
756 wparam: WPARAM,
757 lparam: LPARAM,
758 ) -> Option<isize> {
759 if !self.hide_title_bar || self.state.is_fullscreen() || wparam.0 == 0 {
760 return None;
761 }
762
763 unsafe {
764 let params = lparam.0 as *mut NCCALCSIZE_PARAMS;
765 let saved_top = (*params).rgrc[0].top;
766 let result = DefWindowProcW(handle, WM_NCCALCSIZE, wparam, lparam);
767 (*params).rgrc[0].top = saved_top;
768 if self.state.is_maximized() {
769 let dpi = GetDpiForWindow(handle);
770 (*params).rgrc[0].top += get_frame_thicknessx(dpi);
771 }
772 Some(result.0 as isize)
773 }
774 }
775
776 fn handle_activate_msg(self: &Rc<Self>, wparam: WPARAM) -> Option<isize> {
777 let activated = wparam.loword() > 0;
778
779 let events = self
780 .state
781 .a11y
782 .try_borrow_mut()
783 .ok()
784 .and_then(|mut a11y| a11y.as_mut()?.adapter.update_window_focus_state(activated));
785 if let Some(events) = events {
786 events.raise();
787 }
788
789 let this = self.clone();
790
791 if !activated {
792 this.state.cursor_visible.store(true, Ordering::Relaxed);
793 }
794
795 // When the window is activated (gains focus), reset the modifier tracking state.
796 // This fixes the issue where Alt-Tab away and back leaves stale modifier state
797 // (especially the Alt key) because Windows doesn't always send key-up events to
798 // windows that have lost focus.
799 if activated {
800 this.state.last_reported_modifiers.set(None);
801 this.state.last_reported_capslock.set(None);
802
803 if let Some(mut func) = this.state.callbacks.input.take() {
804 let input = PlatformInput::ModifiersChanged(ModifiersChangedEvent {
805 modifiers: current_modifiers(),
806 capslock: current_capslock(),
807 });
808 func(input);
809 this.state.callbacks.input.set(Some(func));
810 }
811 }
812
813 self.executor
814 .spawn(async move {
815 if let Some(mut func) = this.state.callbacks.active_status_change.take() {
816 func(activated);
817 this.state.callbacks.active_status_change.set(Some(func));
818 }
819 })
820 .detach();
821
822 None
823 }
824
825 fn handle_wm_getobject(&self, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
826 let result = {
827 let mut a11y = self.state.a11y.borrow_mut();
828 let a11y = a11y.as_mut()?;
829 a11y.adapter.handle_wm_getobject(
830 accesskit_windows::WPARAM(wparam.0),
831 accesskit_windows::LPARAM(lparam.0),
832 &mut a11y.activation_handler,
833 )?
834 };
835 // The borrow above must be dropped before calling `.into()`, because
836 // it calls `UiaReturnRawElementProvider` which may send a nested
837 // `WM_GETOBJECT` back into this window procedure.
838 let lresult: accesskit_windows::LRESULT = result.into();
839 Some(lresult.0)
840 }
841
842 fn handle_create_msg(&self, handle: HWND) -> Option<isize> {
843 if self.hide_title_bar {
844 notify_frame_changed(handle);
845 Some(0)
846 } else {
847 None
848 }
849 }
850
851 fn handle_dpi_changed_msg(
852 &self,
853 handle: HWND,
854 wparam: WPARAM,
855 lparam: LPARAM,
856 ) -> Option<isize> {
857 let new_dpi = wparam.loword() as f32;
858
859 let is_maximized = self.state.is_maximized();
860 let new_scale_factor = new_dpi / USER_DEFAULT_SCREEN_DPI as f32;
861 self.state.scale_factor.set(new_scale_factor);
862 self.state.border_offset.update(handle).log_err();
863
864 self.state
865 .direct_manipulation
866 .set_scale_factor(new_scale_factor);
867
868 if is_maximized {
869 // Get the monitor and its work area at the new DPI
870 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONEAREST) };
871 let mut monitor_info: MONITORINFO = unsafe { std::mem::zeroed() };
872 monitor_info.cbSize = std::mem::size_of::<MONITORINFO>() as u32;
873 if unsafe { GetMonitorInfoW(monitor, &mut monitor_info) }.as_bool() {
874 let work_area = monitor_info.rcWork;
875 let width = work_area.right - work_area.left;
876 let height = work_area.bottom - work_area.top;
877
878 // Update the window size to match the new monitor work area
879 // This will trigger WM_SIZE which will handle the size change
880 unsafe {
881 SetWindowPos(
882 handle,
883 None,
884 work_area.left,
885 work_area.top,
886 width,
887 height,
888 SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED,
889 )
890 .context("unable to set maximized window position after dpi has changed")
891 .log_err();
892 }
893
894 // SetWindowPos may not send WM_SIZE for maximized windows in some cases,
895 // so we manually update the size to ensure proper rendering
896 let device_size = size(DevicePixels(width), DevicePixels(height));
897 self.handle_size_change(device_size, new_scale_factor, true);
898 }
899 } else {
900 // For non-maximized windows, use the suggested RECT from the system
901 let rect = unsafe { &*(lparam.0 as *const RECT) };
902 let width = rect.right - rect.left;
903 let height = rect.bottom - rect.top;
904 // this will emit `WM_SIZE` and `WM_MOVE` right here
905 // even before this function returns
906 // the new size is handled in `WM_SIZE`
907 unsafe {
908 SetWindowPos(
909 handle,
910 None,
911 rect.left,
912 rect.top,
913 width,
914 height,
915 SWP_NOZORDER | SWP_NOACTIVATE,
916 )
917 .context("unable to set window position after dpi has changed")
918 .log_err();
919 }
920 }
921
922 Some(0)
923 }
924
925 fn handle_display_change_msg(&self, handle: HWND) -> Option<isize> {
926 let new_monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
927 if new_monitor.is_invalid() {
928 log::error!("No monitor detected!");
929 return None;
930 }
931 let new_display = WindowsDisplay::new(WindowsDisplay::display_id_for_monitor(new_monitor))?;
932 self.state.display.set(new_display);
933 Some(0)
934 }
935
936 fn handle_hit_test_msg(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
937 if self.state.is_fullscreen() {
938 return None;
939 }
940
941 let callback = self.state.callbacks.hit_test_window_control.take();
942 let drag_area = if let Some(mut callback) = callback {
943 let area = callback();
944 self.state
945 .callbacks
946 .hit_test_window_control
947 .set(Some(callback));
948 area.and_then(|area| match area {
949 WindowControlArea::Drag if self.is_movable => Some(HTCAPTION as _),
950 WindowControlArea::Drag => None,
951 WindowControlArea::Close => Some(HTCLOSE as _),
952 WindowControlArea::Max if self.is_resizable => Some(HTMAXBUTTON as _),
953 WindowControlArea::Max if self.is_movable => Some(HTCAPTION as _),
954 WindowControlArea::Max => Some(HTNOWHERE as _),
955 WindowControlArea::Min if self.is_minimizable => Some(HTMINBUTTON as _),
956 WindowControlArea::Min if self.is_movable => Some(HTCAPTION as _),
957 WindowControlArea::Min => Some(HTNOWHERE as _),
958 })
959 } else {
960 None
961 };
962
963 if !self.hide_title_bar {
964 // If the OS draws the title bar, we don't need to handle hit test messages.
965 return drag_area;
966 }
967
968 let dpi = unsafe { GetDpiForWindow(handle) };
969 // We do not use the OS title bar, so the default `DefWindowProcW` will only register a 1px edge for resizes
970 // We need to calculate the frame thickness ourselves and do the hit test manually.
971 let frame_y = get_frame_thicknessx(dpi);
972 let frame_x = get_frame_thicknessy(dpi);
973 let mut cursor_point = POINT {
974 x: lparam.signed_loword().into(),
975 y: lparam.signed_hiword().into(),
976 };
977
978 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
979 if self.is_resizable
980 && !self.state.is_maximized()
981 && 0 <= cursor_point.y
982 && cursor_point.y <= frame_y
983 {
984 // x-axis actually goes from -frame_x to 0
985 return Some(if cursor_point.x <= 0 {
986 HTTOPLEFT
987 } else {
988 let mut rect = Default::default();
989 unsafe { GetWindowRect(handle, &mut rect) }.log_err();
990 // right and bottom bounds of RECT are exclusive, thus `-1`
991 let right = rect.right - rect.left - 1;
992 // the bounds include the padding frames, so accommodate for both of them
993 if right - 2 * frame_x <= cursor_point.x {
994 HTTOPRIGHT
995 } else {
996 HTTOP
997 }
998 } as _);
999 }
1000
1001 drag_area
1002 }
1003
1004 fn handle_nc_mouse_move_msg(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
1005 self.start_tracking_mouse(handle, TME_LEAVE | TME_NONCLIENT);
1006 self.restore_cursor_after_hide();
1007
1008 let mut func = self.state.callbacks.input.take()?;
1009 let scale_factor = self.state.scale_factor.get();
1010
1011 let mut cursor_point = POINT {
1012 x: lparam.signed_loword().into(),
1013 y: lparam.signed_hiword().into(),
1014 };
1015 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1016 let input = PlatformInput::MouseMove(MouseMoveEvent {
1017 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1018 pressed_button: None,
1019 modifiers: current_modifiers(),
1020 });
1021 let handled = !func(input).propagate;
1022 self.state.callbacks.input.set(Some(func));
1023
1024 if handled { Some(0) } else { None }
1025 }
1026
1027 fn handle_nc_mouse_down_msg(
1028 &self,
1029 handle: HWND,
1030 button: MouseButton,
1031 wparam: WPARAM,
1032 lparam: LPARAM,
1033 ) -> Option<isize> {
1034 if let Some(mut func) = self.state.callbacks.input.take() {
1035 let scale_factor = self.state.scale_factor.get();
1036 let mut cursor_point = POINT {
1037 x: lparam.signed_loword().into(),
1038 y: lparam.signed_hiword().into(),
1039 };
1040 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1041 let physical_point = point(DevicePixels(cursor_point.x), DevicePixels(cursor_point.y));
1042 let click_count = self.state.click_state.update(button, physical_point);
1043
1044 let input = PlatformInput::MouseDown(MouseDownEvent {
1045 button,
1046 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1047 modifiers: current_modifiers(),
1048 click_count,
1049 first_mouse: false,
1050 });
1051 let handled = !func(input).propagate;
1052 self.state.callbacks.input.set(Some(func));
1053
1054 if handled {
1055 return Some(0);
1056 }
1057 } else {
1058 };
1059
1060 // Since these are handled in handle_nc_mouse_up_msg we must prevent the default window proc
1061 if button == MouseButton::Left {
1062 match wparam.0 as u32 {
1063 HTMINBUTTON => self.state.nc_button_pressed.set(Some(HTMINBUTTON)),
1064 HTMAXBUTTON => self.state.nc_button_pressed.set(Some(HTMAXBUTTON)),
1065 HTCLOSE => self.state.nc_button_pressed.set(Some(HTCLOSE)),
1066 _ => return None,
1067 };
1068 Some(0)
1069 } else {
1070 None
1071 }
1072 }
1073
1074 fn handle_nc_mouse_up_msg(
1075 &self,
1076 handle: HWND,
1077 button: MouseButton,
1078 wparam: WPARAM,
1079 lparam: LPARAM,
1080 ) -> Option<isize> {
1081 if let Some(mut func) = self.state.callbacks.input.take() {
1082 let scale_factor = self.state.scale_factor.get();
1083
1084 let mut cursor_point = POINT {
1085 x: lparam.signed_loword().into(),
1086 y: lparam.signed_hiword().into(),
1087 };
1088 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1089 let input = PlatformInput::MouseUp(MouseUpEvent {
1090 button,
1091 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1092 modifiers: current_modifiers(),
1093 click_count: 1,
1094 });
1095 let handled = !func(input).propagate;
1096 self.state.callbacks.input.set(Some(func));
1097
1098 if handled {
1099 return Some(0);
1100 }
1101 } else {
1102 }
1103
1104 let last_pressed = self.state.nc_button_pressed.take();
1105 if button == MouseButton::Left
1106 && let Some(last_pressed) = last_pressed
1107 {
1108 let handled = match (wparam.0 as u32, last_pressed) {
1109 (HTMINBUTTON, HTMINBUTTON) if self.is_minimizable => {
1110 unsafe { ShowWindowAsync(handle, SW_MINIMIZE).ok().log_err() };
1111 true
1112 }
1113 (HTMINBUTTON, HTMINBUTTON) => true,
1114 (HTMAXBUTTON, HTMAXBUTTON) if self.is_resizable => {
1115 if self.state.is_maximized() {
1116 unsafe { ShowWindowAsync(handle, SW_NORMAL).ok().log_err() };
1117 } else {
1118 unsafe { ShowWindowAsync(handle, SW_MAXIMIZE).ok().log_err() };
1119 }
1120 true
1121 }
1122 (HTMAXBUTTON, HTMAXBUTTON) => true,
1123 (HTCLOSE, HTCLOSE) => {
1124 unsafe {
1125 PostMessageW(Some(handle), WM_CLOSE, WPARAM::default(), LPARAM::default())
1126 .log_err()
1127 };
1128 true
1129 }
1130 _ => false,
1131 };
1132 if handled {
1133 return Some(0);
1134 }
1135 }
1136
1137 None
1138 }
1139
1140 fn handle_cursor_changed(&self, lparam: LPARAM) -> Option<isize> {
1141 let had_cursor = self.state.current_cursor.get().is_some();
1142
1143 self.state.current_cursor.set(if lparam.0 == 0 {
1144 None
1145 } else {
1146 Some(HCURSOR(lparam.0 as _))
1147 });
1148
1149 if had_cursor != self.state.current_cursor.get().is_some() {
1150 unsafe { SetCursor(self.state.current_cursor.get()) };
1151 }
1152
1153 Some(0)
1154 }
1155
1156 fn handle_set_cursor(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
1157 if unsafe { !IsWindowEnabled(handle).as_bool() }
1158 || matches!(
1159 lparam.loword() as u32,
1160 HTLEFT
1161 | HTRIGHT
1162 | HTTOP
1163 | HTTOPLEFT
1164 | HTTOPRIGHT
1165 | HTBOTTOM
1166 | HTBOTTOMLEFT
1167 | HTBOTTOMRIGHT
1168 )
1169 {
1170 return None;
1171 }
1172 let cursor = if self.state.cursor_visible.load(Ordering::Relaxed) {
1173 self.state.current_cursor.get()
1174 } else {
1175 None
1176 };
1177 unsafe {
1178 SetCursor(cursor);
1179 };
1180 Some(0)
1181 }
1182
1183 fn handle_system_settings_changed(
1184 &self,
1185 handle: HWND,
1186 wparam: WPARAM,
1187 lparam: LPARAM,
1188 ) -> Option<isize> {
1189 if wparam.0 != 0 {
1190 self.state.click_state.system_update(wparam.0);
1191 self.state.border_offset.update(handle).log_err();
1192 // system settings may emit a window message which wants to take the refcell self.state, so drop it
1193
1194 self.system_settings().update(wparam.0);
1195 } else {
1196 self.handle_system_theme_changed(handle, lparam)?;
1197 };
1198
1199 Some(0)
1200 }
1201
1202 fn handle_system_theme_changed(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
1203 // lParam is a pointer to a string that indicates the area containing the system parameter
1204 // that was changed.
1205 let parameter = PCWSTR::from_raw(lparam.0 as _);
1206 if unsafe { !parameter.is_null() && !parameter.is_empty() }
1207 && let Some(parameter_string) = unsafe { parameter.to_string() }.log_err()
1208 {
1209 log::info!("System settings changed: {}", parameter_string);
1210 if parameter_string.as_str() == "ImmersiveColorSet" {
1211 let new_appearance = system_appearance()
1212 .context("unable to get system appearance when handling ImmersiveColorSet")
1213 .log_err()?;
1214
1215 if new_appearance != self.state.appearance.get() {
1216 self.state.appearance.set(new_appearance);
1217 let mut callback = self.state.callbacks.appearance_changed.take()?;
1218
1219 callback();
1220 self.state.callbacks.appearance_changed.set(Some(callback));
1221 configure_dwm_dark_mode(handle, new_appearance);
1222 }
1223 }
1224 }
1225 Some(0)
1226 }
1227
1228 fn handle_input_language_changed(&self) -> Option<isize> {
1229 unsafe {
1230 PostMessageW(
1231 Some(self.platform_window_handle),
1232 WM_GPUI_KEYBOARD_LAYOUT_CHANGED,
1233 WPARAM(self.validation_number),
1234 LPARAM(0),
1235 )
1236 .log_err();
1237 }
1238 Some(0)
1239 }
1240
1241 fn handle_window_visibility_changed(&self, handle: HWND, wparam: WPARAM) -> Option<isize> {
1242 if wparam.0 == 1 {
1243 self.draw_window(handle, false);
1244 }
1245 None
1246 }
1247
1248 fn handle_device_lost(&self, lparam: LPARAM) -> Option<isize> {
1249 let devices = lparam.0 as *const DirectXDevices;
1250 let devices = unsafe { &*devices };
1251 if let Err(err) = self
1252 .state
1253 .renderer
1254 .borrow_mut()
1255 .handle_device_lost(&devices)
1256 {
1257 panic!("Device lost: {err}");
1258 }
1259 // Make sure the first `draw_window` after recovery (whether it comes
1260 // from the forced WM_GPUI_FORCE_UPDATE_WINDOW or a stray WM_PAINT in
1261 // between) is treated as a forced render so it both clears
1262 // `skip_draws` and bypasses the view cache.
1263 self.state.force_render_pending.set(true);
1264 Some(0)
1265 }
1266
1267 fn handle_dm_pointer_hit_test(&self, wparam: WPARAM) -> Option<isize> {
1268 self.state.direct_manipulation.on_pointer_hit_test(wparam);
1269 None
1270 }
1271
1272 #[inline]
1273 fn draw_window(&self, handle: HWND, force_render: bool) -> Option<isize> {
1274 let Some(_guard) = self.state.draw_coordinator.try_begin_draw() else {
1275 log::debug!("deferring re-entrant draw of window {handle:?}");
1276 if force_render {
1277 self.state.force_render_pending.set(true);
1278 }
1279 // Validate the region so a nested message pump doesn't keep
1280 // re-dispatching WM_PAINT for the still-invalid region in a busy
1281 // loop until the in-progress draw unwinds. The vsync thread
1282 // re-invalidates every window on each vsync (see
1283 // `begin_vsync_thread`), so the deferred frame still gets drawn,
1284 // at most one vsync late.
1285 unsafe { ValidateRect(Some(handle), None).ok().log_err() };
1286 return Some(0);
1287 };
1288 let mut request_frame = self.state.callbacks.request_frame.take()?;
1289
1290 self.state.direct_manipulation.update();
1291
1292 let events = self.state.direct_manipulation.drain_events();
1293 if !events.is_empty() {
1294 if let Some(mut func) = self.state.callbacks.input.take() {
1295 for event in events {
1296 func(event);
1297 }
1298 self.state.callbacks.input.set(Some(func));
1299 }
1300 }
1301
1302 let force_render = force_render || self.state.force_render_pending.take();
1303 if force_render {
1304 // Re-enable drawing after a device loss recovery. The forced render
1305 // will rebuild the scene with fresh atlas textures.
1306 self.state.renderer.borrow_mut().mark_drawable();
1307 }
1308 request_frame(RequestFrameOptions {
1309 require_presentation: false,
1310 force_render,
1311 });
1312
1313 self.state.callbacks.request_frame.set(Some(request_frame));
1314 self.update_ime_enabled(handle);
1315 unsafe { ValidateRect(Some(handle), None).ok().log_err() };
1316
1317 Some(0)
1318 }
1319
1320 #[inline]
1321 fn parse_char_message(&self, wparam: WPARAM) -> Option<String> {
1322 let code_point = wparam.loword();
1323
1324 // https://www.unicode.org/versions/Unicode16.0.0/core-spec/chapter-3/#G2630
1325 match code_point {
1326 0xD800..=0xDBFF => {
1327 // High surrogate, wait for low surrogate
1328 self.state.pending_surrogate.set(Some(code_point));
1329 None
1330 }
1331 0xDC00..=0xDFFF => {
1332 if let Some(high_surrogate) = self.state.pending_surrogate.take() {
1333 // Low surrogate, combine with pending high surrogate
1334 String::from_utf16(&[high_surrogate, code_point]).ok()
1335 } else {
1336 // Invalid low surrogate without a preceding high surrogate
1337 log::warn!(
1338 "Received low surrogate without a preceding high surrogate: {code_point:x}"
1339 );
1340 None
1341 }
1342 }
1343 _ => {
1344 self.state.pending_surrogate.set(None);
1345 char::from_u32(code_point as u32)
1346 .filter(|c| !c.is_control())
1347 .map(|c| c.to_string())
1348 }
1349 }
1350 }
1351
1352 /// Clear the hidden flag and restore the cursor immediately
1353 fn restore_cursor_after_hide(&self) {
1354 if !self.state.cursor_visible.swap(true, Ordering::Relaxed) {
1355 unsafe {
1356 SetCursor(self.state.current_cursor.get());
1357 }
1358 }
1359 }
1360
1361 fn start_tracking_mouse(&self, handle: HWND, flags: TRACKMOUSEEVENT_FLAGS) {
1362 if !self.state.hovered.get() {
1363 self.state.hovered.set(true);
1364 unsafe {
1365 TrackMouseEvent(&mut TRACKMOUSEEVENT {
1366 cbSize: std::mem::size_of::<TRACKMOUSEEVENT>() as u32,
1367 dwFlags: flags,
1368 hwndTrack: handle,
1369 dwHoverTime: HOVER_DEFAULT,
1370 })
1371 .log_err()
1372 };
1373 if let Some(mut callback) = self.state.callbacks.hovered_status_change.take() {
1374 callback(true);
1375 self.state
1376 .callbacks
1377 .hovered_status_change
1378 .set(Some(callback));
1379 }
1380 }
1381 }
1382
1383 fn with_input_handler<F, R>(&self, f: F) -> Option<R>
1384 where
1385 F: FnOnce(&mut PlatformInputHandler) -> R,
1386 {
1387 let mut input_handler = self.state.input_handler.take()?;
1388 let result = f(&mut input_handler);
1389 self.state.input_handler.set(Some(input_handler));
1390 Some(result)
1391 }
1392
1393 fn with_input_handler_and_scale_factor<F, R>(&self, f: F) -> Option<R>
1394 where
1395 F: FnOnce(&mut PlatformInputHandler, f32) -> Option<R>,
1396 {
1397 let mut input_handler = self.state.input_handler.take()?;
1398 let scale_factor = self.state.scale_factor.get();
1399
1400 let result = f(&mut input_handler, scale_factor);
1401 self.state.input_handler.set(Some(input_handler));
1402 result
1403 }
1404}
1405
1406struct ImeContext {
1407 hwnd: HWND,
1408 himc: HIMC,
1409}
1410
1411impl ImeContext {
1412 fn get(hwnd: HWND) -> Option<Self> {
1413 let himc = unsafe { ImmGetContext(hwnd) };
1414 if himc.is_invalid() {
1415 return None;
1416 }
1417 Some(Self { hwnd, himc })
1418 }
1419}
1420
1421impl std::ops::Deref for ImeContext {
1422 type Target = HIMC;
1423 fn deref(&self) -> &HIMC {
1424 &self.himc
1425 }
1426}
1427
1428impl Drop for ImeContext {
1429 fn drop(&mut self) {
1430 unsafe {
1431 ImmReleaseContext(self.hwnd, self.himc).ok().log_err();
1432 }
1433 }
1434}
1435
1436fn handle_key_event<F>(
1437 wparam: WPARAM,
1438 lparam: LPARAM,
1439 state: &WindowsWindowState,
1440 f: F,
1441) -> Option<PlatformInput>
1442where
1443 F: FnOnce(Keystroke, bool) -> PlatformInput,
1444{
1445 let virtual_key = VIRTUAL_KEY(wparam.loword());
1446 let modifiers = current_modifiers();
1447
1448 match virtual_key {
1449 VK_SHIFT | VK_CONTROL | VK_MENU | VK_LMENU | VK_RMENU | VK_LWIN | VK_RWIN => {
1450 if state
1451 .last_reported_modifiers
1452 .get()
1453 .is_some_and(|prev_modifiers| prev_modifiers == modifiers)
1454 {
1455 return None;
1456 }
1457 state.last_reported_modifiers.set(Some(modifiers));
1458 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1459 modifiers,
1460 capslock: current_capslock(),
1461 }))
1462 }
1463 VK_PACKET => None,
1464 VK_CAPITAL => {
1465 let capslock = current_capslock();
1466 if state
1467 .last_reported_capslock
1468 .get()
1469 .is_some_and(|prev_capslock| prev_capslock == capslock)
1470 {
1471 return None;
1472 }
1473 state.last_reported_capslock.set(Some(capslock));
1474 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1475 modifiers,
1476 capslock,
1477 }))
1478 }
1479 vkey => {
1480 let keystroke = parse_normal_key(vkey, lparam, modifiers)?;
1481 Some(f(keystroke.0, keystroke.1))
1482 }
1483 }
1484}
1485
1486fn parse_immutable(vkey: VIRTUAL_KEY) -> Option<String> {
1487 Some(
1488 match vkey {
1489 VK_SPACE => "space",
1490 VK_BACK => "backspace",
1491 VK_RETURN => "enter",
1492 VK_TAB => "tab",
1493 VK_UP => "up",
1494 VK_DOWN => "down",
1495 VK_RIGHT => "right",
1496 VK_LEFT => "left",
1497 VK_HOME => "home",
1498 VK_END => "end",
1499 VK_PRIOR => "pageup",
1500 VK_NEXT => "pagedown",
1501 VK_BROWSER_BACK => "back",
1502 VK_BROWSER_FORWARD => "forward",
1503 VK_ESCAPE => "escape",
1504 VK_INSERT => "insert",
1505 VK_DELETE => "delete",
1506 VK_APPS => "menu",
1507 VK_F1 => "f1",
1508 VK_F2 => "f2",
1509 VK_F3 => "f3",
1510 VK_F4 => "f4",
1511 VK_F5 => "f5",
1512 VK_F6 => "f6",
1513 VK_F7 => "f7",
1514 VK_F8 => "f8",
1515 VK_F9 => "f9",
1516 VK_F10 => "f10",
1517 VK_F11 => "f11",
1518 VK_F12 => "f12",
1519 VK_F13 => "f13",
1520 VK_F14 => "f14",
1521 VK_F15 => "f15",
1522 VK_F16 => "f16",
1523 VK_F17 => "f17",
1524 VK_F18 => "f18",
1525 VK_F19 => "f19",
1526 VK_F20 => "f20",
1527 VK_F21 => "f21",
1528 VK_F22 => "f22",
1529 VK_F23 => "f23",
1530 VK_F24 => "f24",
1531 _ => return None,
1532 }
1533 .to_string(),
1534 )
1535}
1536
1537fn parse_normal_key(
1538 vkey: VIRTUAL_KEY,
1539 lparam: LPARAM,
1540 mut modifiers: Modifiers,
1541) -> Option<(Keystroke, bool)> {
1542 let (key_char, prefer_character_input) = process_key(vkey, lparam.hiword());
1543
1544 let key = parse_immutable(vkey).or_else(|| {
1545 let scan_code = lparam.hiword() & 0xFF;
1546 get_keystroke_key(vkey, scan_code as u32, &mut modifiers)
1547 })?;
1548
1549 Some((
1550 Keystroke {
1551 modifiers,
1552 key,
1553 key_char,
1554 },
1555 prefer_character_input,
1556 ))
1557}
1558
1559fn process_key(vkey: VIRTUAL_KEY, scan_code: u16) -> (Option<String>, bool) {
1560 let mut keyboard_state = [0u8; 256];
1561 unsafe {
1562 if GetKeyboardState(&mut keyboard_state).is_err() {
1563 return (None, false);
1564 }
1565 }
1566
1567 let mut buffer_c = [0u16; 8];
1568 let result_c = unsafe {
1569 ToUnicode(
1570 vkey.0 as u32,
1571 scan_code as u32,
1572 Some(&keyboard_state),
1573 &mut buffer_c,
1574 0x4,
1575 )
1576 };
1577
1578 if result_c == 0 {
1579 return (None, false);
1580 }
1581
1582 let c = &buffer_c[..result_c.unsigned_abs() as usize];
1583 let key_char = String::from_utf16(c)
1584 .ok()
1585 .filter(|s| !s.is_empty() && !s.chars().next().unwrap().is_control());
1586
1587 if result_c < 0 {
1588 return (key_char, true);
1589 }
1590
1591 if key_char.is_none() {
1592 return (None, false);
1593 }
1594
1595 // Workaround for some bug that makes the compiler think keyboard_state is still zeroed out
1596 let keyboard_state = std::hint::black_box(keyboard_state);
1597 let ctrl_down = (keyboard_state[VK_CONTROL.0 as usize] & 0x80) != 0;
1598 let alt_down = (keyboard_state[VK_MENU.0 as usize] & 0x80) != 0;
1599 let win_down = (keyboard_state[VK_LWIN.0 as usize] & 0x80) != 0
1600 || (keyboard_state[VK_RWIN.0 as usize] & 0x80) != 0;
1601
1602 let has_modifiers = ctrl_down || alt_down || win_down;
1603 if !has_modifiers {
1604 return (key_char, false);
1605 }
1606
1607 let mut state_no_modifiers = keyboard_state;
1608 state_no_modifiers[VK_CONTROL.0 as usize] = 0;
1609 state_no_modifiers[VK_LCONTROL.0 as usize] = 0;
1610 state_no_modifiers[VK_RCONTROL.0 as usize] = 0;
1611 state_no_modifiers[VK_MENU.0 as usize] = 0;
1612 state_no_modifiers[VK_LMENU.0 as usize] = 0;
1613 state_no_modifiers[VK_RMENU.0 as usize] = 0;
1614 state_no_modifiers[VK_LWIN.0 as usize] = 0;
1615 state_no_modifiers[VK_RWIN.0 as usize] = 0;
1616
1617 let mut buffer_c_no_modifiers = [0u16; 8];
1618 let result_c_no_modifiers = unsafe {
1619 ToUnicode(
1620 vkey.0 as u32,
1621 scan_code as u32,
1622 Some(&state_no_modifiers),
1623 &mut buffer_c_no_modifiers,
1624 0x4,
1625 )
1626 };
1627
1628 let c_no_modifiers = &buffer_c_no_modifiers[..result_c_no_modifiers.unsigned_abs() as usize];
1629 (
1630 key_char,
1631 result_c != result_c_no_modifiers || c != c_no_modifiers,
1632 )
1633}
1634
1635fn parse_ime_composition_string(ctx: HIMC, comp_type: IME_COMPOSITION_STRING) -> Option<Vec<u16>> {
1636 unsafe {
1637 let string_len = ImmGetCompositionStringW(ctx, comp_type, None, 0);
1638 if string_len >= 0 {
1639 let mut buffer = vec![0u8; string_len as usize + 2];
1640 ImmGetCompositionStringW(
1641 ctx,
1642 comp_type,
1643 Some(buffer.as_mut_ptr() as _),
1644 string_len as _,
1645 );
1646 let wstring = std::slice::from_raw_parts::<u16>(
1647 buffer.as_mut_ptr().cast::<u16>(),
1648 string_len as usize / 2,
1649 );
1650 Some(wstring.to_vec())
1651 } else {
1652 None
1653 }
1654 }
1655}
1656
1657#[inline]
1658fn retrieve_composition_cursor_position(ctx: HIMC) -> usize {
1659 unsafe { ImmGetCompositionStringW(ctx, GCS_CURSORPOS, None, 0) as usize }
1660}
1661
1662fn should_use_ime_cursor_position(ctx: HIMC, cursor_pos: usize) -> bool {
1663 let attrs_size = unsafe { ImmGetCompositionStringW(ctx, GCS_COMPATTR, None, 0) } as usize;
1664 if attrs_size == 0 {
1665 return false;
1666 }
1667
1668 let mut attrs = vec![0u8; attrs_size];
1669 let result = unsafe {
1670 ImmGetCompositionStringW(
1671 ctx,
1672 GCS_COMPATTR,
1673 Some(attrs.as_mut_ptr() as *mut _),
1674 attrs_size as u32,
1675 )
1676 };
1677 if result <= 0 {
1678 return false;
1679 }
1680
1681 // Keep the cursor adjacent to the inserted text by only using the suggested position
1682 // if it's adjacent to unconverted text.
1683 let at_cursor_is_input = cursor_pos < attrs.len() && attrs[cursor_pos] == (ATTR_INPUT as u8);
1684 let before_cursor_is_input = cursor_pos > 0
1685 && (cursor_pos - 1) < attrs.len()
1686 && attrs[cursor_pos - 1] == (ATTR_INPUT as u8);
1687
1688 at_cursor_is_input || before_cursor_is_input
1689}
1690
1691#[inline]
1692fn is_virtual_key_pressed(vkey: VIRTUAL_KEY) -> bool {
1693 unsafe { GetKeyState(vkey.0 as i32) < 0 }
1694}
1695
1696#[inline]
1697pub(crate) fn current_modifiers() -> Modifiers {
1698 Modifiers {
1699 control: is_virtual_key_pressed(VK_CONTROL),
1700 alt: is_virtual_key_pressed(VK_MENU),
1701 shift: is_virtual_key_pressed(VK_SHIFT),
1702 platform: is_virtual_key_pressed(VK_LWIN) || is_virtual_key_pressed(VK_RWIN),
1703 function: false,
1704 }
1705}
1706
1707#[inline]
1708pub(crate) fn current_capslock() -> Capslock {
1709 let on = unsafe { GetKeyState(VK_CAPITAL.0 as i32) & 1 } > 0;
1710 Capslock { on }
1711}
1712
1713// there is some additional non-visible space when talking about window
1714// borders on Windows:
1715// - SM_CXSIZEFRAME: The resize handle.
1716// - SM_CXPADDEDBORDER: Additional border space that isn't part of the resize handle.
1717fn get_frame_thicknessx(dpi: u32) -> i32 {
1718 let resize_frame_thickness = unsafe { GetSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) };
1719 let padding_thickness = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
1720 resize_frame_thickness + padding_thickness
1721}
1722
1723fn get_frame_thicknessy(dpi: u32) -> i32 {
1724 let resize_frame_thickness = unsafe { GetSystemMetricsForDpi(SM_CYSIZEFRAME, dpi) };
1725 let padding_thickness = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
1726 resize_frame_thickness + padding_thickness
1727}
1728
1729fn notify_frame_changed(handle: HWND) {
1730 unsafe {
1731 SetWindowPos(
1732 handle,
1733 None,
1734 0,
1735 0,
1736 0,
1737 0,
1738 SWP_FRAMECHANGED
1739 | SWP_NOACTIVATE
1740 | SWP_NOCOPYBITS
1741 | SWP_NOMOVE
1742 | SWP_NOOWNERZORDER
1743 | SWP_NOREPOSITION
1744 | SWP_NOSENDCHANGING
1745 | SWP_NOSIZE
1746 | SWP_NOZORDER,
1747 )
1748 .log_err();
1749 }
1750}
1751