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::*;
21
22pub(crate) const WM_GPUI_CURSOR_STYLE_CHANGED: u32 = WM_USER + 1;
23pub(crate) const WM_GPUI_CLOSE_ONE_WINDOW: u32 = WM_USER + 2;
24pub(crate) const WM_GPUI_TASK_DISPATCHED_ON_MAIN_THREAD: u32 = WM_USER + 3;
25pub(crate) const WM_GPUI_DOCK_MENU_ACTION: u32 = WM_USER + 4;
26pub(crate) const WM_GPUI_FORCE_UPDATE_WINDOW: u32 = WM_USER + 5;
27pub(crate) const WM_GPUI_KEYBOARD_LAYOUT_CHANGED: u32 = WM_USER + 6;
28pub(crate) const WM_GPUI_GPU_DEVICE_LOST: u32 = WM_USER + 7;
29pub(crate) const WM_GPUI_KEYDOWN: u32 = WM_USER + 8;
30
31const SIZE_MOVE_LOOP_TIMER_ID: usize = 1;
32const AUTO_HIDE_TASKBAR_THICKNESS_PX: i32 = 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 _ => None,
115 };
116 if let Some(n) = handled {
117 LRESULT(n)
118 } else {
119 unsafe { DefWindowProcW(handle, msg, wparam, lparam) }
120 }
121 }
122
123 fn handle_move_msg(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
124 let origin = logical_point(
125 lparam.signed_loword() as f32,
126 lparam.signed_hiword() as f32,
127 self.state.scale_factor.get(),
128 );
129 self.state.origin.set(origin);
130 let size = self.state.logical_size.get();
131 let center_x = origin.x.0 + size.width.0 / 2.;
132 let center_y = origin.y.0 + size.height.0 / 2.;
133 let monitor_bounds = self.state.display.get().bounds();
134 if center_x < monitor_bounds.left().0
135 || center_x > monitor_bounds.right().0
136 || center_y < monitor_bounds.top().0
137 || center_y > monitor_bounds.bottom().0
138 {
139 // center of the window may have moved to another monitor
140 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
141 // minimize the window can trigger this event too, in this case,
142 // monitor is invalid, we do nothing.
143 if !monitor.is_invalid() && self.state.display.get().handle != monitor {
144 // we will get the same monitor if we only have one
145 self.state
146 .display
147 .set(WindowsDisplay::new_with_handle(monitor).log_err()?);
148 }
149 }
150 if let Some(mut callback) = self.state.callbacks.moved.take() {
151 callback();
152 self.state.callbacks.moved.set(Some(callback));
153 }
154 Some(0)
155 }
156
157 fn handle_get_min_max_info_msg(&self, lparam: LPARAM) -> Option<isize> {
158 let min_size = self.state.min_size?;
159 let scale_factor = self.state.scale_factor.get();
160 let boarder_offset = &self.state.border_offset;
161
162 unsafe {
163 let minmax_info = &mut *(lparam.0 as *mut MINMAXINFO);
164 minmax_info.ptMinTrackSize.x =
165 min_size.width.scale(scale_factor).0 as i32 + boarder_offset.width_offset.get();
166 minmax_info.ptMinTrackSize.y =
167 min_size.height.scale(scale_factor).0 as i32 + boarder_offset.height_offset.get();
168 }
169 Some(0)
170 }
171
172 fn handle_size_msg(&self, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
173 // Don't resize the renderer when the window is minimized, but record that it was minimized so
174 // that on restore the swap chain can be recreated via `update_drawable_size_even_if_unchanged`.
175 if wparam.0 == SIZE_MINIMIZED as usize {
176 self.state
177 .restore_from_minimized
178 .set(self.state.callbacks.request_frame.take());
179 return Some(0);
180 }
181
182 let width = lparam.loword().max(1) as i32;
183 let height = lparam.hiword().max(1) as i32;
184 let new_size = size(DevicePixels(width), DevicePixels(height));
185
186 let scale_factor = self.state.scale_factor.get();
187 let mut should_resize_renderer = false;
188 if let Some(restore_from_minimized) = self.state.restore_from_minimized.take() {
189 self.state
190 .callbacks
191 .request_frame
192 .set(Some(restore_from_minimized));
193 } else {
194 should_resize_renderer = true;
195 }
196
197 self.handle_size_change(new_size, scale_factor, should_resize_renderer);
198 Some(0)
199 }
200
201 fn handle_size_change(
202 &self,
203 device_size: Size<DevicePixels>,
204 scale_factor: f32,
205 should_resize_renderer: bool,
206 ) {
207 let new_logical_size = device_size.to_pixels(scale_factor);
208
209 self.state.logical_size.set(new_logical_size);
210 if should_resize_renderer
211 && let Err(e) = self.state.renderer.borrow_mut().resize(device_size)
212 {
213 log::error!("Failed to resize renderer, invalidating devices: {}", e);
214 self.state
215 .invalidate_devices
216 .store(true, std::sync::atomic::Ordering::Release);
217 }
218 if let Some(mut callback) = self.state.callbacks.resize.take() {
219 callback(new_logical_size, scale_factor);
220 self.state.callbacks.resize.set(Some(callback));
221 }
222 }
223
224 fn handle_size_move_loop(&self, handle: HWND) -> Option<isize> {
225 unsafe {
226 let ret = SetTimer(
227 Some(handle),
228 SIZE_MOVE_LOOP_TIMER_ID,
229 USER_TIMER_MINIMUM,
230 None,
231 );
232 if ret == 0 {
233 log::error!(
234 "unable to create timer: {}",
235 std::io::Error::last_os_error()
236 );
237 }
238 }
239 None
240 }
241
242 fn handle_size_move_loop_exit(&self, handle: HWND) -> Option<isize> {
243 unsafe {
244 KillTimer(Some(handle), SIZE_MOVE_LOOP_TIMER_ID).log_err();
245 }
246 None
247 }
248
249 fn handle_timer_msg(&self, handle: HWND, wparam: WPARAM) -> Option<isize> {
250 if wparam.0 == SIZE_MOVE_LOOP_TIMER_ID {
251 let mut runnables = self.main_receiver.clone().try_iter();
252 while let Some(Ok(runnable)) = runnables.next() {
253 WindowsDispatcher::execute_runnable(runnable);
254 }
255 self.handle_paint_msg(handle)
256 } else {
257 None
258 }
259 }
260
261 fn handle_paint_msg(&self, handle: HWND) -> Option<isize> {
262 self.draw_window(handle, false)
263 }
264
265 fn handle_close_msg(&self) -> Option<isize> {
266 let mut callback = self.state.callbacks.should_close.take()?;
267 let should_close = callback();
268 self.state.callbacks.should_close.set(Some(callback));
269 if should_close { None } else { Some(0) }
270 }
271
272 fn handle_destroy_msg(&self, handle: HWND) -> Option<isize> {
273 let callback = { self.state.callbacks.close.take() };
274 // Re-enable parent window if this was a modal dialog
275 if let Some(parent_hwnd) = self.parent_hwnd {
276 unsafe {
277 let _ = EnableWindow(parent_hwnd, true);
278 let _ = SetForegroundWindow(parent_hwnd);
279 }
280 }
281
282 if let Some(callback) = callback {
283 callback();
284 }
285 unsafe {
286 PostMessageW(
287 Some(self.platform_window_handle),
288 WM_GPUI_CLOSE_ONE_WINDOW,
289 WPARAM(self.validation_number),
290 LPARAM(handle.0 as isize),
291 )
292 .log_err();
293 }
294 Some(0)
295 }
296
297 fn handle_mouse_move_msg(&self, handle: HWND, lparam: LPARAM, wparam: WPARAM) -> Option<isize> {
298 self.start_tracking_mouse(handle, TME_LEAVE);
299
300 let Some(mut func) = self.state.callbacks.input.take() else {
301 return Some(1);
302 };
303 let scale_factor = self.state.scale_factor.get();
304
305 let pressed_button = match MODIFIERKEYS_FLAGS(wparam.loword() as u32) {
306 flags if flags.contains(MK_LBUTTON) => Some(MouseButton::Left),
307 flags if flags.contains(MK_RBUTTON) => Some(MouseButton::Right),
308 flags if flags.contains(MK_MBUTTON) => Some(MouseButton::Middle),
309 flags if flags.contains(MK_XBUTTON1) => {
310 Some(MouseButton::Navigate(NavigationDirection::Back))
311 }
312 flags if flags.contains(MK_XBUTTON2) => {
313 Some(MouseButton::Navigate(NavigationDirection::Forward))
314 }
315 _ => None,
316 };
317 let x = lparam.signed_loword() as f32;
318 let y = lparam.signed_hiword() as f32;
319 let input = PlatformInput::MouseMove(MouseMoveEvent {
320 position: logical_point(x, y, scale_factor),
321 pressed_button,
322 modifiers: current_modifiers(),
323 });
324 let handled = !func(input).propagate;
325 self.state.callbacks.input.set(Some(func));
326
327 if handled { Some(0) } else { Some(1) }
328 }
329
330 fn handle_mouse_leave_msg(&self) -> Option<isize> {
331 self.state.hovered.set(false);
332 if let Some(mut callback) = self.state.callbacks.hovered_status_change.take() {
333 callback(false);
334 self.state
335 .callbacks
336 .hovered_status_change
337 .set(Some(callback));
338 }
339
340 Some(0)
341 }
342
343 fn handle_syskeyup_msg(&self, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
344 let input = handle_key_event(wparam, lparam, &self.state, |keystroke, _| {
345 PlatformInput::KeyUp(KeyUpEvent { keystroke })
346 })?;
347 let mut func = self.state.callbacks.input.take()?;
348
349 func(input);
350 self.state.callbacks.input.set(Some(func));
351
352 // Always return 0 to indicate that the message was handled, so we could properly handle `ModifiersChanged` event.
353 Some(0)
354 }
355
356 // It's a known bug that you can't trigger `ctrl-shift-0`. See:
357 // https://superuser.com/questions/1455762/ctrl-shift-number-key-combination-has-stopped-working-for-a-few-numbers
358 fn handle_keydown_msg(&self, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
359 let Some(input) = handle_key_event(
360 wparam,
361 lparam,
362 &self.state,
363 |keystroke, prefer_character_input| {
364 PlatformInput::KeyDown(KeyDownEvent {
365 keystroke,
366 is_held: lparam.0 & (0x1 << 30) > 0,
367 prefer_character_input,
368 })
369 },
370 ) else {
371 return Some(1);
372 };
373
374 let Some(mut func) = self.state.callbacks.input.take() else {
375 return Some(1);
376 };
377
378 let handled = !func(input).propagate;
379
380 self.state.callbacks.input.set(Some(func));
381
382 if handled { Some(0) } else { Some(1) }
383 }
384
385 fn handle_keyup_msg(&self, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
386 let Some(input) = handle_key_event(wparam, lparam, &self.state, |keystroke, _| {
387 PlatformInput::KeyUp(KeyUpEvent { keystroke })
388 }) else {
389 return Some(1);
390 };
391
392 let Some(mut func) = self.state.callbacks.input.take() else {
393 return Some(1);
394 };
395
396 let handled = !func(input).propagate;
397 self.state.callbacks.input.set(Some(func));
398
399 if handled { Some(0) } else { Some(1) }
400 }
401
402 fn handle_char_msg(&self, wparam: WPARAM) -> Option<isize> {
403 let input = self.parse_char_message(wparam)?;
404 self.with_input_handler(|input_handler| {
405 input_handler.replace_text_in_range(None, &input);
406 });
407
408 Some(0)
409 }
410
411 fn handle_mouse_down_msg(
412 &self,
413 handle: HWND,
414 button: MouseButton,
415 lparam: LPARAM,
416 ) -> Option<isize> {
417 unsafe { SetCapture(handle) };
418
419 let Some(mut func) = self.state.callbacks.input.take() else {
420 return Some(1);
421 };
422 let x = lparam.signed_loword();
423 let y = lparam.signed_hiword();
424 let physical_point = point(DevicePixels(x as i32), DevicePixels(y as i32));
425 let click_count = self.state.click_state.update(button, physical_point);
426 let scale_factor = self.state.scale_factor.get();
427
428 let input = PlatformInput::MouseDown(MouseDownEvent {
429 button,
430 position: logical_point(x as f32, y as f32, scale_factor),
431 modifiers: current_modifiers(),
432 click_count,
433 first_mouse: false,
434 });
435 let handled = !func(input).propagate;
436 self.state.callbacks.input.set(Some(func));
437
438 if handled { Some(0) } else { Some(1) }
439 }
440
441 fn handle_mouse_up_msg(
442 &self,
443 _handle: HWND,
444 button: MouseButton,
445 lparam: LPARAM,
446 ) -> Option<isize> {
447 unsafe { ReleaseCapture().log_err() };
448
449 let Some(mut func) = self.state.callbacks.input.take() else {
450 return Some(1);
451 };
452 let x = lparam.signed_loword() as f32;
453 let y = lparam.signed_hiword() as f32;
454 let click_count = self.state.click_state.current_count.get();
455 let scale_factor = self.state.scale_factor.get();
456
457 let input = PlatformInput::MouseUp(MouseUpEvent {
458 button,
459 position: logical_point(x, y, scale_factor),
460 modifiers: current_modifiers(),
461 click_count,
462 });
463 let handled = !func(input).propagate;
464 self.state.callbacks.input.set(Some(func));
465
466 if handled { Some(0) } else { Some(1) }
467 }
468
469 fn handle_xbutton_msg(
470 &self,
471 handle: HWND,
472 wparam: WPARAM,
473 lparam: LPARAM,
474 handler: impl Fn(&Self, HWND, MouseButton, LPARAM) -> Option<isize>,
475 ) -> Option<isize> {
476 let nav_dir = match wparam.hiword() {
477 XBUTTON1 => NavigationDirection::Back,
478 XBUTTON2 => NavigationDirection::Forward,
479 _ => return Some(1),
480 };
481 handler(self, handle, MouseButton::Navigate(nav_dir), lparam)
482 }
483
484 fn handle_mouse_wheel_msg(
485 &self,
486 handle: HWND,
487 wparam: WPARAM,
488 lparam: LPARAM,
489 ) -> Option<isize> {
490 let modifiers = current_modifiers();
491
492 let Some(mut func) = self.state.callbacks.input.take() else {
493 return Some(1);
494 };
495 let scale_factor = self.state.scale_factor.get();
496 let wheel_scroll_amount = match modifiers.shift {
497 true => self
498 .system_settings()
499 .mouse_wheel_settings
500 .wheel_scroll_chars
501 .get(),
502 false => self
503 .system_settings()
504 .mouse_wheel_settings
505 .wheel_scroll_lines
506 .get(),
507 };
508
509 let wheel_distance =
510 (wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_amount as f32;
511 let mut cursor_point = POINT {
512 x: lparam.signed_loword().into(),
513 y: lparam.signed_hiword().into(),
514 };
515 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
516 let input = PlatformInput::ScrollWheel(ScrollWheelEvent {
517 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
518 delta: ScrollDelta::Lines(match modifiers.shift {
519 true => Point {
520 x: wheel_distance,
521 y: 0.0,
522 },
523 false => Point {
524 y: wheel_distance,
525 x: 0.0,
526 },
527 }),
528 modifiers,
529 touch_phase: TouchPhase::Moved,
530 });
531 let handled = !func(input).propagate;
532 self.state.callbacks.input.set(Some(func));
533
534 if handled { Some(0) } else { Some(1) }
535 }
536
537 fn handle_mouse_horizontal_wheel_msg(
538 &self,
539 handle: HWND,
540 wparam: WPARAM,
541 lparam: LPARAM,
542 ) -> Option<isize> {
543 let Some(mut func) = self.state.callbacks.input.take() else {
544 return Some(1);
545 };
546 let scale_factor = self.state.scale_factor.get();
547 let wheel_scroll_chars = self
548 .system_settings()
549 .mouse_wheel_settings
550 .wheel_scroll_chars
551 .get();
552
553 let wheel_distance =
554 (-wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_chars as f32;
555 let mut cursor_point = POINT {
556 x: lparam.signed_loword().into(),
557 y: lparam.signed_hiword().into(),
558 };
559 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
560 let event = PlatformInput::ScrollWheel(ScrollWheelEvent {
561 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
562 delta: ScrollDelta::Lines(Point {
563 x: wheel_distance,
564 y: 0.0,
565 }),
566 modifiers: current_modifiers(),
567 touch_phase: TouchPhase::Moved,
568 });
569 let handled = !func(event).propagate;
570 self.state.callbacks.input.set(Some(func));
571
572 if handled { Some(0) } else { Some(1) }
573 }
574
575 fn retrieve_caret_position(&self) -> Option<POINT> {
576 self.with_input_handler_and_scale_factor(|input_handler, scale_factor| {
577 let caret_range = input_handler.selected_text_range(false)?;
578 let caret_position = input_handler.bounds_for_range(caret_range.range)?;
579 Some(POINT {
580 // logical to physical
581 x: (caret_position.origin.x.0 * scale_factor) as i32,
582 y: (caret_position.origin.y.0 * scale_factor) as i32
583 + ((caret_position.size.height.0 * scale_factor) as i32 / 2),
584 })
585 })
586 }
587
588 fn handle_ime_position(&self, handle: HWND) -> Option<isize> {
589 if let Some(caret_position) = self.retrieve_caret_position() {
590 self.update_ime_position(handle, caret_position);
591 }
592 Some(0)
593 }
594
595 pub(crate) fn update_ime_position(&self, handle: HWND, caret_position: POINT) {
596 unsafe {
597 let ctx = ImmGetContext(handle);
598 if ctx.is_invalid() {
599 return;
600 }
601
602 let config = COMPOSITIONFORM {
603 dwStyle: CFS_POINT,
604 ptCurrentPos: caret_position,
605 ..Default::default()
606 };
607 ImmSetCompositionWindow(ctx, &config).ok().log_err();
608 let config = CANDIDATEFORM {
609 dwStyle: CFS_CANDIDATEPOS,
610 ptCurrentPos: caret_position,
611 ..Default::default()
612 };
613 ImmSetCandidateWindow(ctx, &config).ok().log_err();
614 ImmReleaseContext(handle, ctx).ok().log_err();
615 }
616 }
617
618 fn handle_ime_composition(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
619 let ctx = unsafe { ImmGetContext(handle) };
620 let result = self.handle_ime_composition_inner(ctx, lparam);
621 unsafe { ImmReleaseContext(handle, ctx).ok().log_err() };
622 result
623 }
624
625 fn handle_ime_composition_inner(&self, ctx: HIMC, lparam: LPARAM) -> Option<isize> {
626 let lparam = lparam.0 as u32;
627 if lparam == 0 {
628 // Japanese IME may send this message with lparam = 0, which indicates that
629 // there is no composition string.
630 self.with_input_handler(|input_handler| {
631 input_handler.replace_text_in_range(None, "");
632 })?;
633 Some(0)
634 } else {
635 if lparam & GCS_RESULTSTR.0 > 0 {
636 let comp_result = parse_ime_composition_string(ctx, GCS_RESULTSTR)?;
637 self.with_input_handler(|input_handler| {
638 input_handler
639 .replace_text_in_range(None, &String::from_utf16_lossy(&comp_result));
640 })?;
641 }
642 if lparam & GCS_COMPSTR.0 > 0 {
643 let comp_string = parse_ime_composition_string(ctx, GCS_COMPSTR)?;
644 let caret_pos =
645 (!comp_string.is_empty() && lparam & GCS_CURSORPOS.0 > 0).then(|| {
646 let cursor_pos = retrieve_composition_cursor_position(ctx);
647 let pos = if should_use_ime_cursor_position(ctx, cursor_pos) {
648 cursor_pos
649 } else {
650 comp_string.len()
651 };
652 pos..pos
653 });
654 self.with_input_handler(|input_handler| {
655 input_handler.replace_and_mark_text_in_range(
656 None,
657 &String::from_utf16_lossy(&comp_string),
658 caret_pos,
659 );
660 })?;
661 }
662 if lparam & (GCS_RESULTSTR.0 | GCS_COMPSTR.0) > 0 {
663 return Some(0);
664 }
665
666 // currently, we don't care other stuff
667 None
668 }
669 }
670
671 /// SEE: https://learn.microsoft.com/en-us/windows/win32/winmsg/wm-nccalcsize
672 fn handle_calc_client_size(
673 &self,
674 handle: HWND,
675 wparam: WPARAM,
676 lparam: LPARAM,
677 ) -> Option<isize> {
678 if !self.hide_title_bar || self.state.is_fullscreen() || wparam.0 == 0 {
679 return None;
680 }
681
682 let is_maximized = self.state.is_maximized();
683 let insets = get_client_area_insets(handle, is_maximized, self.windows_version);
684 // wparam is TRUE so lparam points to an NCCALCSIZE_PARAMS structure
685 let mut params = lparam.0 as *mut NCCALCSIZE_PARAMS;
686 let mut requested_client_rect = unsafe { &mut ((*params).rgrc) };
687
688 requested_client_rect[0].left += insets.left;
689 requested_client_rect[0].top += insets.top;
690 requested_client_rect[0].right -= insets.right;
691 requested_client_rect[0].bottom -= insets.bottom;
692
693 // Fix auto hide taskbar not showing. This solution is based on the approach
694 // used by Chrome. However, it may result in one row of pixels being obscured
695 // in our client area. But as Chrome says, "there seems to be no better solution."
696 if is_maximized
697 && let Some(taskbar_position) = self.system_settings().auto_hide_taskbar_position.get()
698 {
699 // For the auto-hide taskbar, adjust in by 1 pixel on taskbar edge,
700 // so the window isn't treated as a "fullscreen app", which would cause
701 // the taskbar to disappear.
702 match taskbar_position {
703 AutoHideTaskbarPosition::Left => {
704 requested_client_rect[0].left += AUTO_HIDE_TASKBAR_THICKNESS_PX
705 }
706 AutoHideTaskbarPosition::Top => {
707 requested_client_rect[0].top += AUTO_HIDE_TASKBAR_THICKNESS_PX
708 }
709 AutoHideTaskbarPosition::Right => {
710 requested_client_rect[0].right -= AUTO_HIDE_TASKBAR_THICKNESS_PX
711 }
712 AutoHideTaskbarPosition::Bottom => {
713 requested_client_rect[0].bottom -= AUTO_HIDE_TASKBAR_THICKNESS_PX
714 }
715 }
716 }
717
718 Some(0)
719 }
720
721 fn handle_activate_msg(self: &Rc<Self>, wparam: WPARAM) -> Option<isize> {
722 let activated = wparam.loword() > 0;
723 let this = self.clone();
724 self.executor
725 .spawn(async move {
726 if let Some(mut func) = this.state.callbacks.active_status_change.take() {
727 func(activated);
728 this.state.callbacks.active_status_change.set(Some(func));
729 }
730 })
731 .detach();
732
733 None
734 }
735
736 fn handle_create_msg(&self, handle: HWND) -> Option<isize> {
737 if self.hide_title_bar {
738 notify_frame_changed(handle);
739 Some(0)
740 } else {
741 None
742 }
743 }
744
745 fn handle_dpi_changed_msg(
746 &self,
747 handle: HWND,
748 wparam: WPARAM,
749 lparam: LPARAM,
750 ) -> Option<isize> {
751 let new_dpi = wparam.loword() as f32;
752
753 let is_maximized = self.state.is_maximized();
754 let new_scale_factor = new_dpi / USER_DEFAULT_SCREEN_DPI as f32;
755 self.state.scale_factor.set(new_scale_factor);
756 self.state.border_offset.update(handle).log_err();
757
758 if is_maximized {
759 // Get the monitor and its work area at the new DPI
760 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONEAREST) };
761 let mut monitor_info: MONITORINFO = unsafe { std::mem::zeroed() };
762 monitor_info.cbSize = std::mem::size_of::<MONITORINFO>() as u32;
763 if unsafe { GetMonitorInfoW(monitor, &mut monitor_info) }.as_bool() {
764 let work_area = monitor_info.rcWork;
765 let width = work_area.right - work_area.left;
766 let height = work_area.bottom - work_area.top;
767
768 // Update the window size to match the new monitor work area
769 // This will trigger WM_SIZE which will handle the size change
770 unsafe {
771 SetWindowPos(
772 handle,
773 None,
774 work_area.left,
775 work_area.top,
776 width,
777 height,
778 SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED,
779 )
780 .context("unable to set maximized window position after dpi has changed")
781 .log_err();
782 }
783
784 // SetWindowPos may not send WM_SIZE for maximized windows in some cases,
785 // so we manually update the size to ensure proper rendering
786 let device_size = size(DevicePixels(width), DevicePixels(height));
787 self.handle_size_change(device_size, new_scale_factor, true);
788 }
789 } else {
790 // For non-maximized windows, use the suggested RECT from the system
791 let rect = unsafe { &*(lparam.0 as *const RECT) };
792 let width = rect.right - rect.left;
793 let height = rect.bottom - rect.top;
794 // this will emit `WM_SIZE` and `WM_MOVE` right here
795 // even before this function returns
796 // the new size is handled in `WM_SIZE`
797 unsafe {
798 SetWindowPos(
799 handle,
800 None,
801 rect.left,
802 rect.top,
803 width,
804 height,
805 SWP_NOZORDER | SWP_NOACTIVATE,
806 )
807 .context("unable to set window position after dpi has changed")
808 .log_err();
809 }
810 }
811
812 Some(0)
813 }
814
815 /// The following conditions will trigger this event:
816 /// 1. The monitor on which the window is located goes offline or changes resolution.
817 /// 2. Another monitor goes offline, is plugged in, or changes resolution.
818 ///
819 /// In either case, the window will only receive information from the monitor on which
820 /// it is located.
821 ///
822 /// For example, in the case of condition 2, where the monitor on which the window is
823 /// located has actually changed nothing, it will still receive this event.
824 fn handle_display_change_msg(&self, handle: HWND) -> Option<isize> {
825 // NOTE:
826 // Even the `lParam` holds the resolution of the screen, we just ignore it.
827 // Because WM_DPICHANGED, WM_MOVE, WM_SIZE will come first, window reposition and resize
828 // are handled there.
829 // So we only care about if monitor is disconnected.
830 let previous_monitor = self.state.display.get();
831 if WindowsDisplay::is_connected(previous_monitor.handle) {
832 // we are fine, other display changed
833 return None;
834 }
835 // display disconnected
836 // in this case, the OS will move our window to another monitor, and minimize it.
837 // we deminimize the window and query the monitor after moving
838 unsafe {
839 let _ = ShowWindow(handle, SW_SHOWNORMAL);
840 };
841 let new_monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
842 // all monitors disconnected
843 if new_monitor.is_invalid() {
844 log::error!("No monitor detected!");
845 return None;
846 }
847 let new_display = WindowsDisplay::new_with_handle(new_monitor).log_err()?;
848 self.state.display.set(new_display);
849 Some(0)
850 }
851
852 fn handle_hit_test_msg(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
853 if !self.is_movable || self.state.is_fullscreen() {
854 return None;
855 }
856
857 let callback = self.state.callbacks.hit_test_window_control.take();
858 let drag_area = if let Some(mut callback) = callback {
859 let area = callback();
860 self.state
861 .callbacks
862 .hit_test_window_control
863 .set(Some(callback));
864 if let Some(area) = area {
865 match area {
866 WindowControlArea::Drag => Some(HTCAPTION as _),
867 WindowControlArea::Close => return Some(HTCLOSE as _),
868 WindowControlArea::Max => return Some(HTMAXBUTTON as _),
869 WindowControlArea::Min => return Some(HTMINBUTTON as _),
870 }
871 } else {
872 None
873 }
874 } else {
875 None
876 };
877
878 if !self.hide_title_bar {
879 // If the OS draws the title bar, we don't need to handle hit test messages.
880 return drag_area;
881 }
882
883 let dpi = unsafe { GetDpiForWindow(handle) };
884 // We do not use the OS title bar, so the default `DefWindowProcW` will only register a 1px edge for resizes
885 // We need to calculate the frame thickness ourselves and do the hit test manually.
886 let frame_y = get_frame_thicknessx(dpi);
887 let frame_x = get_frame_thicknessy(dpi);
888 let mut cursor_point = POINT {
889 x: lparam.signed_loword().into(),
890 y: lparam.signed_hiword().into(),
891 };
892
893 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
894 if !self.state.is_maximized() && 0 <= cursor_point.y && cursor_point.y <= frame_y {
895 // x-axis actually goes from -frame_x to 0
896 return Some(if cursor_point.x <= 0 {
897 HTTOPLEFT
898 } else {
899 let mut rect = Default::default();
900 unsafe { GetWindowRect(handle, &mut rect) }.log_err();
901 // right and bottom bounds of RECT are exclusive, thus `-1`
902 let right = rect.right - rect.left - 1;
903 // the bounds include the padding frames, so accomodate for both of them
904 if right - 2 * frame_x <= cursor_point.x {
905 HTTOPRIGHT
906 } else {
907 HTTOP
908 }
909 } as _);
910 }
911
912 drag_area
913 }
914
915 fn handle_nc_mouse_move_msg(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
916 self.start_tracking_mouse(handle, TME_LEAVE | TME_NONCLIENT);
917
918 let mut func = self.state.callbacks.input.take()?;
919 let scale_factor = self.state.scale_factor.get();
920
921 let mut cursor_point = POINT {
922 x: lparam.signed_loword().into(),
923 y: lparam.signed_hiword().into(),
924 };
925 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
926 let input = PlatformInput::MouseMove(MouseMoveEvent {
927 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
928 pressed_button: None,
929 modifiers: current_modifiers(),
930 });
931 let handled = !func(input).propagate;
932 self.state.callbacks.input.set(Some(func));
933
934 if handled { Some(0) } else { None }
935 }
936
937 fn handle_nc_mouse_down_msg(
938 &self,
939 handle: HWND,
940 button: MouseButton,
941 wparam: WPARAM,
942 lparam: LPARAM,
943 ) -> Option<isize> {
944 if let Some(mut func) = self.state.callbacks.input.take() {
945 let scale_factor = self.state.scale_factor.get();
946 let mut cursor_point = POINT {
947 x: lparam.signed_loword().into(),
948 y: lparam.signed_hiword().into(),
949 };
950 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
951 let physical_point = point(DevicePixels(cursor_point.x), DevicePixels(cursor_point.y));
952 let click_count = self.state.click_state.update(button, physical_point);
953
954 let input = PlatformInput::MouseDown(MouseDownEvent {
955 button,
956 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
957 modifiers: current_modifiers(),
958 click_count,
959 first_mouse: false,
960 });
961 let handled = !func(input).propagate;
962 self.state.callbacks.input.set(Some(func));
963
964 if handled {
965 return Some(0);
966 }
967 } else {
968 };
969
970 // Since these are handled in handle_nc_mouse_up_msg we must prevent the default window proc
971 if button == MouseButton::Left {
972 match wparam.0 as u32 {
973 HTMINBUTTON => self.state.nc_button_pressed.set(Some(HTMINBUTTON)),
974 HTMAXBUTTON => self.state.nc_button_pressed.set(Some(HTMAXBUTTON)),
975 HTCLOSE => self.state.nc_button_pressed.set(Some(HTCLOSE)),
976 _ => return None,
977 };
978 Some(0)
979 } else {
980 None
981 }
982 }
983
984 fn handle_nc_mouse_up_msg(
985 &self,
986 handle: HWND,
987 button: MouseButton,
988 wparam: WPARAM,
989 lparam: LPARAM,
990 ) -> Option<isize> {
991 if let Some(mut func) = self.state.callbacks.input.take() {
992 let scale_factor = self.state.scale_factor.get();
993
994 let mut cursor_point = POINT {
995 x: lparam.signed_loword().into(),
996 y: lparam.signed_hiword().into(),
997 };
998 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
999 let input = PlatformInput::MouseUp(MouseUpEvent {
1000 button,
1001 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1002 modifiers: current_modifiers(),
1003 click_count: 1,
1004 });
1005 let handled = !func(input).propagate;
1006 self.state.callbacks.input.set(Some(func));
1007
1008 if handled {
1009 return Some(0);
1010 }
1011 } else {
1012 }
1013
1014 let last_pressed = self.state.nc_button_pressed.take();
1015 if button == MouseButton::Left
1016 && let Some(last_pressed) = last_pressed
1017 {
1018 let handled = match (wparam.0 as u32, last_pressed) {
1019 (HTMINBUTTON, HTMINBUTTON) => {
1020 unsafe { ShowWindowAsync(handle, SW_MINIMIZE).ok().log_err() };
1021 true
1022 }
1023 (HTMAXBUTTON, HTMAXBUTTON) => {
1024 if self.state.is_maximized() {
1025 unsafe { ShowWindowAsync(handle, SW_NORMAL).ok().log_err() };
1026 } else {
1027 unsafe { ShowWindowAsync(handle, SW_MAXIMIZE).ok().log_err() };
1028 }
1029 true
1030 }
1031 (HTCLOSE, HTCLOSE) => {
1032 unsafe {
1033 PostMessageW(Some(handle), WM_CLOSE, WPARAM::default(), LPARAM::default())
1034 .log_err()
1035 };
1036 true
1037 }
1038 _ => false,
1039 };
1040 if handled {
1041 return Some(0);
1042 }
1043 }
1044
1045 None
1046 }
1047
1048 fn handle_cursor_changed(&self, lparam: LPARAM) -> Option<isize> {
1049 let had_cursor = self.state.current_cursor.get().is_some();
1050
1051 self.state.current_cursor.set(if lparam.0 == 0 {
1052 None
1053 } else {
1054 Some(HCURSOR(lparam.0 as _))
1055 });
1056
1057 if had_cursor != self.state.current_cursor.get().is_some() {
1058 unsafe { SetCursor(self.state.current_cursor.get()) };
1059 }
1060
1061 Some(0)
1062 }
1063
1064 fn handle_set_cursor(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
1065 if unsafe { !IsWindowEnabled(handle).as_bool() }
1066 || matches!(
1067 lparam.loword() as u32,
1068 HTLEFT
1069 | HTRIGHT
1070 | HTTOP
1071 | HTTOPLEFT
1072 | HTTOPRIGHT
1073 | HTBOTTOM
1074 | HTBOTTOMLEFT
1075 | HTBOTTOMRIGHT
1076 )
1077 {
1078 return None;
1079 }
1080 unsafe {
1081 SetCursor(self.state.current_cursor.get());
1082 };
1083 Some(0)
1084 }
1085
1086 fn handle_system_settings_changed(
1087 &self,
1088 handle: HWND,
1089 wparam: WPARAM,
1090 lparam: LPARAM,
1091 ) -> Option<isize> {
1092 if wparam.0 != 0 {
1093 let display = self.state.display.get();
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(display, wparam.0);
1099 } else {
1100 self.handle_system_theme_changed(handle, lparam)?;
1101 };
1102 // Force to trigger WM_NCCALCSIZE event to ensure that we handle auto hide
1103 // taskbar correctly.
1104 notify_frame_changed(handle);
1105
1106 Some(0)
1107 }
1108
1109 fn handle_system_theme_changed(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
1110 // lParam is a pointer to a string that indicates the area containing the system parameter
1111 // that was changed.
1112 let parameter = PCWSTR::from_raw(lparam.0 as _);
1113 if unsafe { !parameter.is_null() && !parameter.is_empty() }
1114 && let Some(parameter_string) = unsafe { parameter.to_string() }.log_err()
1115 {
1116 log::info!("System settings changed: {}", parameter_string);
1117 if parameter_string.as_str() == "ImmersiveColorSet" {
1118 let new_appearance = system_appearance()
1119 .context("unable to get system appearance when handling ImmersiveColorSet")
1120 .log_err()?;
1121
1122 if new_appearance != self.state.appearance.get() {
1123 self.state.appearance.set(new_appearance);
1124 let mut callback = self.state.callbacks.appearance_changed.take()?;
1125
1126 callback();
1127 self.state.callbacks.appearance_changed.set(Some(callback));
1128 configure_dwm_dark_mode(handle, new_appearance);
1129 }
1130 }
1131 }
1132 Some(0)
1133 }
1134
1135 fn handle_input_language_changed(&self) -> Option<isize> {
1136 unsafe {
1137 PostMessageW(
1138 Some(self.platform_window_handle),
1139 WM_GPUI_KEYBOARD_LAYOUT_CHANGED,
1140 WPARAM(self.validation_number),
1141 LPARAM(0),
1142 )
1143 .log_err();
1144 }
1145 Some(0)
1146 }
1147
1148 fn handle_window_visibility_changed(&self, handle: HWND, wparam: WPARAM) -> Option<isize> {
1149 if wparam.0 == 1 {
1150 self.draw_window(handle, false);
1151 }
1152 None
1153 }
1154
1155 fn handle_device_lost(&self, lparam: LPARAM) -> Option<isize> {
1156 let devices = lparam.0 as *const DirectXDevices;
1157 let devices = unsafe { &*devices };
1158 if let Err(err) = self
1159 .state
1160 .renderer
1161 .borrow_mut()
1162 .handle_device_lost(&devices)
1163 {
1164 panic!("Device lost: {err}");
1165 }
1166 Some(0)
1167 }
1168
1169 #[inline]
1170 fn draw_window(&self, handle: HWND, force_render: bool) -> Option<isize> {
1171 let mut request_frame = self.state.callbacks.request_frame.take()?;
1172
1173 // we are instructing gpui to force render a frame, this will
1174 // re-populate all the gpu textures for us so we can resume drawing in
1175 // case we disabled drawing earlier due to a device loss
1176 self.state.renderer.borrow_mut().mark_drawable();
1177 request_frame(RequestFrameOptions {
1178 require_presentation: false,
1179 force_render,
1180 });
1181
1182 self.state.callbacks.request_frame.set(Some(request_frame));
1183 unsafe { ValidateRect(Some(handle), None).ok().log_err() };
1184
1185 Some(0)
1186 }
1187
1188 #[inline]
1189 fn parse_char_message(&self, wparam: WPARAM) -> Option<String> {
1190 let code_point = wparam.loword();
1191
1192 // https://www.unicode.org/versions/Unicode16.0.0/core-spec/chapter-3/#G2630
1193 match code_point {
1194 0xD800..=0xDBFF => {
1195 // High surrogate, wait for low surrogate
1196 self.state.pending_surrogate.set(Some(code_point));
1197 None
1198 }
1199 0xDC00..=0xDFFF => {
1200 if let Some(high_surrogate) = self.state.pending_surrogate.take() {
1201 // Low surrogate, combine with pending high surrogate
1202 String::from_utf16(&[high_surrogate, code_point]).ok()
1203 } else {
1204 // Invalid low surrogate without a preceding high surrogate
1205 log::warn!(
1206 "Received low surrogate without a preceding high surrogate: {code_point:x}"
1207 );
1208 None
1209 }
1210 }
1211 _ => {
1212 self.state.pending_surrogate.set(None);
1213 char::from_u32(code_point as u32)
1214 .filter(|c| !c.is_control())
1215 .map(|c| c.to_string())
1216 }
1217 }
1218 }
1219
1220 fn start_tracking_mouse(&self, handle: HWND, flags: TRACKMOUSEEVENT_FLAGS) {
1221 if !self.state.hovered.get() {
1222 self.state.hovered.set(true);
1223 unsafe {
1224 TrackMouseEvent(&mut TRACKMOUSEEVENT {
1225 cbSize: std::mem::size_of::<TRACKMOUSEEVENT>() as u32,
1226 dwFlags: flags,
1227 hwndTrack: handle,
1228 dwHoverTime: HOVER_DEFAULT,
1229 })
1230 .log_err()
1231 };
1232 if let Some(mut callback) = self.state.callbacks.hovered_status_change.take() {
1233 callback(true);
1234 self.state
1235 .callbacks
1236 .hovered_status_change
1237 .set(Some(callback));
1238 }
1239 }
1240 }
1241
1242 fn with_input_handler<F, R>(&self, f: F) -> Option<R>
1243 where
1244 F: FnOnce(&mut PlatformInputHandler) -> R,
1245 {
1246 let mut input_handler = self.state.input_handler.take()?;
1247 let result = f(&mut input_handler);
1248 self.state.input_handler.set(Some(input_handler));
1249 Some(result)
1250 }
1251
1252 fn with_input_handler_and_scale_factor<F, R>(&self, f: F) -> Option<R>
1253 where
1254 F: FnOnce(&mut PlatformInputHandler, f32) -> Option<R>,
1255 {
1256 let mut input_handler = self.state.input_handler.take()?;
1257 let scale_factor = self.state.scale_factor.get();
1258
1259 let result = f(&mut input_handler, scale_factor);
1260 self.state.input_handler.set(Some(input_handler));
1261 result
1262 }
1263}
1264
1265fn handle_key_event<F>(
1266 wparam: WPARAM,
1267 lparam: LPARAM,
1268 state: &WindowsWindowState,
1269 f: F,
1270) -> Option<PlatformInput>
1271where
1272 F: FnOnce(Keystroke, bool) -> PlatformInput,
1273{
1274 let virtual_key = VIRTUAL_KEY(wparam.loword());
1275 let modifiers = current_modifiers();
1276
1277 match virtual_key {
1278 VK_SHIFT | VK_CONTROL | VK_MENU | VK_LMENU | VK_RMENU | VK_LWIN | VK_RWIN => {
1279 if state
1280 .last_reported_modifiers
1281 .get()
1282 .is_some_and(|prev_modifiers| prev_modifiers == modifiers)
1283 {
1284 return None;
1285 }
1286 state.last_reported_modifiers.set(Some(modifiers));
1287 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1288 modifiers,
1289 capslock: current_capslock(),
1290 }))
1291 }
1292 VK_PACKET => None,
1293 VK_CAPITAL => {
1294 let capslock = current_capslock();
1295 if state
1296 .last_reported_capslock
1297 .get()
1298 .is_some_and(|prev_capslock| prev_capslock == capslock)
1299 {
1300 return None;
1301 }
1302 state.last_reported_capslock.set(Some(capslock));
1303 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1304 modifiers,
1305 capslock,
1306 }))
1307 }
1308 vkey => {
1309 let keystroke = parse_normal_key(vkey, lparam, modifiers)?;
1310 Some(f(keystroke.0, keystroke.1))
1311 }
1312 }
1313}
1314
1315fn parse_immutable(vkey: VIRTUAL_KEY) -> Option<String> {
1316 Some(
1317 match vkey {
1318 VK_SPACE => "space",
1319 VK_BACK => "backspace",
1320 VK_RETURN => "enter",
1321 VK_TAB => "tab",
1322 VK_UP => "up",
1323 VK_DOWN => "down",
1324 VK_RIGHT => "right",
1325 VK_LEFT => "left",
1326 VK_HOME => "home",
1327 VK_END => "end",
1328 VK_PRIOR => "pageup",
1329 VK_NEXT => "pagedown",
1330 VK_BROWSER_BACK => "back",
1331 VK_BROWSER_FORWARD => "forward",
1332 VK_ESCAPE => "escape",
1333 VK_INSERT => "insert",
1334 VK_DELETE => "delete",
1335 VK_APPS => "menu",
1336 VK_F1 => "f1",
1337 VK_F2 => "f2",
1338 VK_F3 => "f3",
1339 VK_F4 => "f4",
1340 VK_F5 => "f5",
1341 VK_F6 => "f6",
1342 VK_F7 => "f7",
1343 VK_F8 => "f8",
1344 VK_F9 => "f9",
1345 VK_F10 => "f10",
1346 VK_F11 => "f11",
1347 VK_F12 => "f12",
1348 VK_F13 => "f13",
1349 VK_F14 => "f14",
1350 VK_F15 => "f15",
1351 VK_F16 => "f16",
1352 VK_F17 => "f17",
1353 VK_F18 => "f18",
1354 VK_F19 => "f19",
1355 VK_F20 => "f20",
1356 VK_F21 => "f21",
1357 VK_F22 => "f22",
1358 VK_F23 => "f23",
1359 VK_F24 => "f24",
1360 _ => return None,
1361 }
1362 .to_string(),
1363 )
1364}
1365
1366fn parse_normal_key(
1367 vkey: VIRTUAL_KEY,
1368 lparam: LPARAM,
1369 mut modifiers: Modifiers,
1370) -> Option<(Keystroke, bool)> {
1371 let (key_char, prefer_character_input) = process_key(vkey, lparam.hiword());
1372
1373 let key = parse_immutable(vkey).or_else(|| {
1374 let scan_code = lparam.hiword() & 0xFF;
1375 get_keystroke_key(vkey, scan_code as u32, &mut modifiers)
1376 })?;
1377
1378 Some((
1379 Keystroke {
1380 modifiers,
1381 key,
1382 key_char,
1383 },
1384 prefer_character_input,
1385 ))
1386}
1387
1388fn process_key(vkey: VIRTUAL_KEY, scan_code: u16) -> (Option<String>, bool) {
1389 let mut keyboard_state = [0u8; 256];
1390 unsafe {
1391 if GetKeyboardState(&mut keyboard_state).is_err() {
1392 return (None, false);
1393 }
1394 }
1395
1396 let mut buffer_c = [0u16; 8];
1397 let result_c = unsafe {
1398 ToUnicode(
1399 vkey.0 as u32,
1400 scan_code as u32,
1401 Some(&keyboard_state),
1402 &mut buffer_c,
1403 0x4,
1404 )
1405 };
1406
1407 if result_c == 0 {
1408 return (None, false);
1409 }
1410
1411 let c = &buffer_c[..result_c.unsigned_abs() as usize];
1412 let key_char = String::from_utf16(c)
1413 .ok()
1414 .filter(|s| !s.is_empty() && !s.chars().next().unwrap().is_control());
1415
1416 if result_c < 0 {
1417 return (key_char, true);
1418 }
1419
1420 if key_char.is_none() {
1421 return (None, false);
1422 }
1423
1424 // Workaround for some bug that makes the compiler think keyboard_state is still zeroed out
1425 let keyboard_state = std::hint::black_box(keyboard_state);
1426 let ctrl_down = (keyboard_state[VK_CONTROL.0 as usize] & 0x80) != 0;
1427 let alt_down = (keyboard_state[VK_MENU.0 as usize] & 0x80) != 0;
1428 let win_down = (keyboard_state[VK_LWIN.0 as usize] & 0x80) != 0
1429 || (keyboard_state[VK_RWIN.0 as usize] & 0x80) != 0;
1430
1431 let has_modifiers = ctrl_down || alt_down || win_down;
1432 if !has_modifiers {
1433 return (key_char, false);
1434 }
1435
1436 let mut state_no_modifiers = keyboard_state;
1437 state_no_modifiers[VK_CONTROL.0 as usize] = 0;
1438 state_no_modifiers[VK_LCONTROL.0 as usize] = 0;
1439 state_no_modifiers[VK_RCONTROL.0 as usize] = 0;
1440 state_no_modifiers[VK_MENU.0 as usize] = 0;
1441 state_no_modifiers[VK_LMENU.0 as usize] = 0;
1442 state_no_modifiers[VK_RMENU.0 as usize] = 0;
1443 state_no_modifiers[VK_LWIN.0 as usize] = 0;
1444 state_no_modifiers[VK_RWIN.0 as usize] = 0;
1445
1446 let mut buffer_c_no_modifiers = [0u16; 8];
1447 let result_c_no_modifiers = unsafe {
1448 ToUnicode(
1449 vkey.0 as u32,
1450 scan_code as u32,
1451 Some(&state_no_modifiers),
1452 &mut buffer_c_no_modifiers,
1453 0x4,
1454 )
1455 };
1456
1457 let c_no_modifiers = &buffer_c_no_modifiers[..result_c_no_modifiers.unsigned_abs() as usize];
1458 (
1459 key_char,
1460 result_c != result_c_no_modifiers || c != c_no_modifiers,
1461 )
1462}
1463
1464fn parse_ime_composition_string(ctx: HIMC, comp_type: IME_COMPOSITION_STRING) -> Option<Vec<u16>> {
1465 unsafe {
1466 let string_len = ImmGetCompositionStringW(ctx, comp_type, None, 0);
1467 if string_len >= 0 {
1468 let mut buffer = vec![0u8; string_len as usize + 2];
1469 ImmGetCompositionStringW(
1470 ctx,
1471 comp_type,
1472 Some(buffer.as_mut_ptr() as _),
1473 string_len as _,
1474 );
1475 let wstring = std::slice::from_raw_parts::<u16>(
1476 buffer.as_mut_ptr().cast::<u16>(),
1477 string_len as usize / 2,
1478 );
1479 Some(wstring.to_vec())
1480 } else {
1481 None
1482 }
1483 }
1484}
1485
1486#[inline]
1487fn retrieve_composition_cursor_position(ctx: HIMC) -> usize {
1488 unsafe { ImmGetCompositionStringW(ctx, GCS_CURSORPOS, None, 0) as usize }
1489}
1490
1491fn should_use_ime_cursor_position(ctx: HIMC, cursor_pos: usize) -> bool {
1492 let attrs_size = unsafe { ImmGetCompositionStringW(ctx, GCS_COMPATTR, None, 0) } as usize;
1493 if attrs_size == 0 {
1494 return false;
1495 }
1496
1497 let mut attrs = vec![0u8; attrs_size];
1498 let result = unsafe {
1499 ImmGetCompositionStringW(
1500 ctx,
1501 GCS_COMPATTR,
1502 Some(attrs.as_mut_ptr() as *mut _),
1503 attrs_size as u32,
1504 )
1505 };
1506 if result <= 0 {
1507 return false;
1508 }
1509
1510 // Keep the cursor adjacent to the inserted text by only using the suggested position
1511 // if it's adjacent to unconverted text.
1512 let at_cursor_is_input = cursor_pos < attrs.len() && attrs[cursor_pos] == (ATTR_INPUT as u8);
1513 let before_cursor_is_input = cursor_pos > 0
1514 && (cursor_pos - 1) < attrs.len()
1515 && attrs[cursor_pos - 1] == (ATTR_INPUT as u8);
1516
1517 at_cursor_is_input || before_cursor_is_input
1518}
1519
1520#[inline]
1521fn is_virtual_key_pressed(vkey: VIRTUAL_KEY) -> bool {
1522 unsafe { GetKeyState(vkey.0 as i32) < 0 }
1523}
1524
1525#[inline]
1526pub(crate) fn current_modifiers() -> Modifiers {
1527 Modifiers {
1528 control: is_virtual_key_pressed(VK_CONTROL),
1529 alt: is_virtual_key_pressed(VK_MENU),
1530 shift: is_virtual_key_pressed(VK_SHIFT),
1531 platform: is_virtual_key_pressed(VK_LWIN) || is_virtual_key_pressed(VK_RWIN),
1532 function: false,
1533 }
1534}
1535
1536#[inline]
1537pub(crate) fn current_capslock() -> Capslock {
1538 let on = unsafe { GetKeyState(VK_CAPITAL.0 as i32) & 1 } > 0;
1539 Capslock { on }
1540}
1541
1542fn get_client_area_insets(
1543 handle: HWND,
1544 is_maximized: bool,
1545 windows_version: WindowsVersion,
1546) -> RECT {
1547 // For maximized windows, Windows outdents the window rect from the screen's client rect
1548 // by `frame_thickness` on each edge, meaning `insets` must contain `frame_thickness`
1549 // on all sides (including the top) to avoid the client area extending onto adjacent
1550 // monitors.
1551 //
1552 // For non-maximized windows, things become complicated:
1553 //
1554 // - On Windows 10
1555 // The top inset must be zero, since if there is any nonclient area, Windows will draw
1556 // a full native titlebar outside the client area. (This doesn't occur in the maximized
1557 // case.)
1558 //
1559 // - On Windows 11
1560 // The top inset is calculated using an empirical formula that I derived through various
1561 // tests. Without this, the top 1-2 rows of pixels in our window would be obscured.
1562 let dpi = unsafe { GetDpiForWindow(handle) };
1563 let frame_thickness = get_frame_thicknessx(dpi);
1564 let top_insets = if is_maximized {
1565 frame_thickness
1566 } else {
1567 match windows_version {
1568 WindowsVersion::Win10 => 0,
1569 WindowsVersion::Win11 => (dpi as f32 / USER_DEFAULT_SCREEN_DPI as f32).round() as i32,
1570 }
1571 };
1572 RECT {
1573 left: frame_thickness,
1574 top: top_insets,
1575 right: frame_thickness,
1576 bottom: frame_thickness,
1577 }
1578}
1579
1580// there is some additional non-visible space when talking about window
1581// borders on Windows:
1582// - SM_CXSIZEFRAME: The resize handle.
1583// - SM_CXPADDEDBORDER: Additional border space that isn't part of the resize handle.
1584fn get_frame_thicknessx(dpi: u32) -> i32 {
1585 let resize_frame_thickness = unsafe { GetSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) };
1586 let padding_thickness = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
1587 resize_frame_thickness + padding_thickness
1588}
1589
1590fn get_frame_thicknessy(dpi: u32) -> i32 {
1591 let resize_frame_thickness = unsafe { GetSystemMetricsForDpi(SM_CYSIZEFRAME, dpi) };
1592 let padding_thickness = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
1593 resize_frame_thickness + padding_thickness
1594}
1595
1596fn notify_frame_changed(handle: HWND) {
1597 unsafe {
1598 SetWindowPos(
1599 handle,
1600 None,
1601 0,
1602 0,
1603 0,
1604 0,
1605 SWP_FRAMECHANGED
1606 | SWP_NOACTIVATE
1607 | SWP_NOCOPYBITS
1608 | SWP_NOMOVE
1609 | SWP_NOOWNERZORDER
1610 | SWP_NOREPOSITION
1611 | SWP_NOSENDCHANGING
1612 | SWP_NOSIZE
1613 | SWP_NOZORDER,
1614 )
1615 .log_err();
1616 }
1617}