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