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 WM_ACTIVATE => self.handle_activate_msg(wparam),
44 WM_CREATE => self.handle_create_msg(handle),
45 WM_MOVE => self.handle_move_msg(handle, lparam),
46 WM_SIZE => self.handle_size_msg(wparam, lparam),
47 WM_GETMINMAXINFO => self.handle_get_min_max_info_msg(lparam),
48 WM_ENTERSIZEMOVE | WM_ENTERMENULOOP => self.handle_size_move_loop(handle),
49 WM_EXITSIZEMOVE | WM_EXITMENULOOP => self.handle_size_move_loop_exit(handle),
50 WM_TIMER => self.handle_timer_msg(handle, wparam),
51 WM_NCCALCSIZE => self.handle_calc_client_size(handle, wparam, lparam),
52 WM_DPICHANGED => self.handle_dpi_changed_msg(handle, wparam, lparam),
53 WM_DISPLAYCHANGE => self.handle_display_change_msg(handle),
54 WM_NCHITTEST => self.handle_hit_test_msg(handle, msg, wparam, lparam),
55 WM_PAINT => self.handle_paint_msg(handle),
56 WM_CLOSE => self.handle_close_msg(),
57 WM_DESTROY => self.handle_destroy_msg(handle),
58 WM_MOUSEMOVE => self.handle_mouse_move_msg(handle, lparam, wparam),
59 WM_MOUSELEAVE | WM_NCMOUSELEAVE => self.handle_mouse_leave_msg(),
60 WM_NCMOUSEMOVE => self.handle_nc_mouse_move_msg(handle, lparam),
61 // Treat double click as a second single click, since we track the double clicks ourselves.
62 // If you don't interact with any elements, this will fall through to the windows default
63 // behavior of toggling whether the window is maximized.
64 WM_NCLBUTTONDBLCLK | WM_NCLBUTTONDOWN => {
65 self.handle_nc_mouse_down_msg(handle, MouseButton::Left, wparam, lparam)
66 }
67 WM_NCRBUTTONDOWN => {
68 self.handle_nc_mouse_down_msg(handle, MouseButton::Right, wparam, lparam)
69 }
70 WM_NCMBUTTONDOWN => {
71 self.handle_nc_mouse_down_msg(handle, MouseButton::Middle, wparam, lparam)
72 }
73 WM_NCLBUTTONUP => {
74 self.handle_nc_mouse_up_msg(handle, MouseButton::Left, wparam, lparam)
75 }
76 WM_NCRBUTTONUP => {
77 self.handle_nc_mouse_up_msg(handle, MouseButton::Right, wparam, lparam)
78 }
79 WM_NCMBUTTONUP => {
80 self.handle_nc_mouse_up_msg(handle, MouseButton::Middle, wparam, lparam)
81 }
82 WM_LBUTTONDOWN => self.handle_mouse_down_msg(handle, MouseButton::Left, lparam),
83 WM_RBUTTONDOWN => self.handle_mouse_down_msg(handle, MouseButton::Right, lparam),
84 WM_MBUTTONDOWN => self.handle_mouse_down_msg(handle, MouseButton::Middle, lparam),
85 WM_XBUTTONDOWN => {
86 self.handle_xbutton_msg(handle, wparam, lparam, Self::handle_mouse_down_msg)
87 }
88 WM_LBUTTONUP => self.handle_mouse_up_msg(handle, MouseButton::Left, lparam),
89 WM_RBUTTONUP => self.handle_mouse_up_msg(handle, MouseButton::Right, lparam),
90 WM_MBUTTONUP => self.handle_mouse_up_msg(handle, MouseButton::Middle, lparam),
91 WM_XBUTTONUP => {
92 self.handle_xbutton_msg(handle, wparam, lparam, Self::handle_mouse_up_msg)
93 }
94 WM_MOUSEWHEEL => self.handle_mouse_wheel_msg(handle, wparam, lparam),
95 WM_MOUSEHWHEEL => self.handle_mouse_horizontal_wheel_msg(handle, wparam, lparam),
96 WM_SYSKEYUP => self.handle_syskeyup_msg(wparam, lparam),
97 WM_KEYUP => self.handle_keyup_msg(wparam, lparam),
98 WM_GPUI_KEYDOWN => self.handle_keydown_msg(wparam, lparam),
99 WM_CHAR => self.handle_char_msg(wparam),
100 WM_IME_STARTCOMPOSITION => self.handle_ime_position(handle),
101 WM_IME_COMPOSITION => self.handle_ime_composition(handle, lparam),
102 WM_SETCURSOR => self.handle_set_cursor(handle, lparam),
103 WM_SETTINGCHANGE => self.handle_system_settings_changed(handle, wparam, lparam),
104 WM_INPUTLANGCHANGE => self.handle_input_language_changed(),
105 WM_SHOWWINDOW => self.handle_window_visibility_changed(handle, wparam),
106 WM_GPUI_CURSOR_STYLE_CHANGED => self.handle_cursor_changed(lparam),
107 WM_GPUI_FORCE_UPDATE_WINDOW => self.draw_window(handle, true),
108 WM_GPUI_GPU_DEVICE_LOST => self.handle_device_lost(lparam),
109 _ => None,
110 };
111 if let Some(n) = handled {
112 LRESULT(n)
113 } else {
114 unsafe { DefWindowProcW(handle, msg, wparam, lparam) }
115 }
116 }
117
118 fn handle_move_msg(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
119 let mut lock = self.state.borrow_mut();
120 let origin = logical_point(
121 lparam.signed_loword() as f32,
122 lparam.signed_hiword() as f32,
123 lock.scale_factor,
124 );
125 lock.origin = origin;
126 let size = lock.logical_size;
127 let center_x = origin.x.0 + size.width.0 / 2.;
128 let center_y = origin.y.0 + size.height.0 / 2.;
129 let monitor_bounds = lock.display.bounds();
130 if center_x < monitor_bounds.left().0
131 || center_x > monitor_bounds.right().0
132 || center_y < monitor_bounds.top().0
133 || center_y > monitor_bounds.bottom().0
134 {
135 // center of the window may have moved to another monitor
136 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
137 // minimize the window can trigger this event too, in this case,
138 // monitor is invalid, we do nothing.
139 if !monitor.is_invalid() && lock.display.handle != monitor {
140 // we will get the same monitor if we only have one
141 lock.display = WindowsDisplay::new_with_handle(monitor).log_err()?;
142 }
143 }
144 if let Some(mut callback) = lock.callbacks.moved.take() {
145 drop(lock);
146 callback();
147 self.state.borrow_mut().callbacks.moved = Some(callback);
148 }
149 Some(0)
150 }
151
152 fn handle_get_min_max_info_msg(&self, lparam: LPARAM) -> Option<isize> {
153 let lock = self.state.borrow();
154 let min_size = lock.min_size?;
155 let scale_factor = lock.scale_factor;
156 let boarder_offset = lock.border_offset;
157 drop(lock);
158 unsafe {
159 let minmax_info = &mut *(lparam.0 as *mut MINMAXINFO);
160 minmax_info.ptMinTrackSize.x =
161 min_size.width.scale(scale_factor).0 as i32 + boarder_offset.width_offset;
162 minmax_info.ptMinTrackSize.y =
163 min_size.height.scale(scale_factor).0 as i32 + boarder_offset.height_offset;
164 }
165 Some(0)
166 }
167
168 fn handle_size_msg(&self, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
169 let mut lock = self.state.borrow_mut();
170
171 // Don't resize the renderer when the window is minimized, but record that it was minimized so
172 // that on restore the swap chain can be recreated via `update_drawable_size_even_if_unchanged`.
173 if wparam.0 == SIZE_MINIMIZED as usize {
174 lock.restore_from_minimized = lock.callbacks.request_frame.take();
175 return Some(0);
176 }
177
178 let width = lparam.loword().max(1) as i32;
179 let height = lparam.hiword().max(1) as i32;
180 let new_size = size(DevicePixels(width), DevicePixels(height));
181
182 let scale_factor = lock.scale_factor;
183 let mut should_resize_renderer = false;
184 if lock.restore_from_minimized.is_some() {
185 lock.callbacks.request_frame = lock.restore_from_minimized.take();
186 } else {
187 should_resize_renderer = true;
188 }
189 drop(lock);
190
191 self.handle_size_change(new_size, scale_factor, should_resize_renderer);
192 Some(0)
193 }
194
195 fn handle_size_change(
196 &self,
197 device_size: Size<DevicePixels>,
198 scale_factor: f32,
199 should_resize_renderer: bool,
200 ) {
201 let new_logical_size = device_size.to_pixels(scale_factor);
202 let mut lock = self.state.borrow_mut();
203 lock.logical_size = new_logical_size;
204 if should_resize_renderer && let Err(e) = lock.renderer.resize(device_size) {
205 log::error!("Failed to resize renderer, invalidating devices: {}", e);
206 lock.invalidate_devices
207 .store(true, std::sync::atomic::Ordering::Release);
208 }
209 if let Some(mut callback) = lock.callbacks.resize.take() {
210 drop(lock);
211 callback(new_logical_size, scale_factor);
212 self.state.borrow_mut().callbacks.resize = Some(callback);
213 }
214 }
215
216 fn handle_size_move_loop(&self, handle: HWND) -> Option<isize> {
217 unsafe {
218 let ret = SetTimer(
219 Some(handle),
220 SIZE_MOVE_LOOP_TIMER_ID,
221 USER_TIMER_MINIMUM,
222 None,
223 );
224 if ret == 0 {
225 log::error!(
226 "unable to create timer: {}",
227 std::io::Error::last_os_error()
228 );
229 }
230 }
231 None
232 }
233
234 fn handle_size_move_loop_exit(&self, handle: HWND) -> Option<isize> {
235 unsafe {
236 KillTimer(Some(handle), SIZE_MOVE_LOOP_TIMER_ID).log_err();
237 }
238 None
239 }
240
241 fn handle_timer_msg(&self, handle: HWND, wparam: WPARAM) -> Option<isize> {
242 if wparam.0 == SIZE_MOVE_LOOP_TIMER_ID {
243 for runnable in self.main_receiver.drain() {
244 WindowsDispatcher::execute_runnable(runnable);
245 }
246 self.handle_paint_msg(handle)
247 } else {
248 None
249 }
250 }
251
252 fn handle_paint_msg(&self, handle: HWND) -> Option<isize> {
253 self.draw_window(handle, false)
254 }
255
256 fn handle_close_msg(&self) -> Option<isize> {
257 let mut callback = self.state.borrow_mut().callbacks.should_close.take()?;
258 let should_close = callback();
259 self.state.borrow_mut().callbacks.should_close = Some(callback);
260 if should_close { None } else { Some(0) }
261 }
262
263 fn handle_destroy_msg(&self, handle: HWND) -> Option<isize> {
264 let callback = {
265 let mut lock = self.state.borrow_mut();
266 lock.callbacks.close.take()
267 };
268 if let Some(callback) = callback {
269 callback();
270 }
271 unsafe {
272 PostMessageW(
273 Some(self.platform_window_handle),
274 WM_GPUI_CLOSE_ONE_WINDOW,
275 WPARAM(self.validation_number),
276 LPARAM(handle.0 as isize),
277 )
278 .log_err();
279 }
280 Some(0)
281 }
282
283 fn handle_mouse_move_msg(&self, handle: HWND, lparam: LPARAM, wparam: WPARAM) -> Option<isize> {
284 self.start_tracking_mouse(handle, TME_LEAVE);
285
286 let mut lock = self.state.borrow_mut();
287 let Some(mut func) = lock.callbacks.input.take() else {
288 return Some(1);
289 };
290 let scale_factor = lock.scale_factor;
291 drop(lock);
292
293 let pressed_button = match MODIFIERKEYS_FLAGS(wparam.loword() as u32) {
294 flags if flags.contains(MK_LBUTTON) => Some(MouseButton::Left),
295 flags if flags.contains(MK_RBUTTON) => Some(MouseButton::Right),
296 flags if flags.contains(MK_MBUTTON) => Some(MouseButton::Middle),
297 flags if flags.contains(MK_XBUTTON1) => {
298 Some(MouseButton::Navigate(NavigationDirection::Back))
299 }
300 flags if flags.contains(MK_XBUTTON2) => {
301 Some(MouseButton::Navigate(NavigationDirection::Forward))
302 }
303 _ => None,
304 };
305 let x = lparam.signed_loword() as f32;
306 let y = lparam.signed_hiword() as f32;
307 let input = PlatformInput::MouseMove(MouseMoveEvent {
308 position: logical_point(x, y, scale_factor),
309 pressed_button,
310 modifiers: current_modifiers(),
311 });
312 let handled = !func(input).propagate;
313 self.state.borrow_mut().callbacks.input = Some(func);
314
315 if handled { Some(0) } else { Some(1) }
316 }
317
318 fn handle_mouse_leave_msg(&self) -> Option<isize> {
319 let mut lock = self.state.borrow_mut();
320 lock.hovered = false;
321 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
322 drop(lock);
323 callback(false);
324 self.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
325 }
326
327 Some(0)
328 }
329
330 fn handle_syskeyup_msg(&self, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
331 let mut lock = self.state.borrow_mut();
332 let input = handle_key_event(wparam, lparam, &mut lock, |keystroke, _| {
333 PlatformInput::KeyUp(KeyUpEvent { keystroke })
334 })?;
335 let mut func = lock.callbacks.input.take()?;
336 drop(lock);
337 func(input);
338 self.state.borrow_mut().callbacks.input = Some(func);
339
340 // Always return 0 to indicate that the message was handled, so we could properly handle `ModifiersChanged` event.
341 Some(0)
342 }
343
344 // It's a known bug that you can't trigger `ctrl-shift-0`. See:
345 // https://superuser.com/questions/1455762/ctrl-shift-number-key-combination-has-stopped-working-for-a-few-numbers
346 fn handle_keydown_msg(&self, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
347 let mut lock = self.state.borrow_mut();
348 let Some(input) = handle_key_event(
349 wparam,
350 lparam,
351 &mut lock,
352 |keystroke, prefer_character_input| {
353 PlatformInput::KeyDown(KeyDownEvent {
354 keystroke,
355 is_held: lparam.0 & (0x1 << 30) > 0,
356 prefer_character_input,
357 })
358 },
359 ) else {
360 return Some(1);
361 };
362 drop(lock);
363
364 let Some(mut func) = self.state.borrow_mut().callbacks.input.take() else {
365 return Some(1);
366 };
367
368 let handled = !func(input).propagate;
369
370 self.state.borrow_mut().callbacks.input = Some(func);
371
372 if handled { Some(0) } else { Some(1) }
373 }
374
375 fn handle_keyup_msg(&self, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
376 let mut lock = self.state.borrow_mut();
377 let Some(input) = handle_key_event(wparam, lparam, &mut lock, |keystroke, _| {
378 PlatformInput::KeyUp(KeyUpEvent { keystroke })
379 }) else {
380 return Some(1);
381 };
382
383 let Some(mut func) = lock.callbacks.input.take() else {
384 return Some(1);
385 };
386 drop(lock);
387
388 let handled = !func(input).propagate;
389 self.state.borrow_mut().callbacks.input = Some(func);
390
391 if handled { Some(0) } else { Some(1) }
392 }
393
394 fn handle_char_msg(&self, wparam: WPARAM) -> Option<isize> {
395 let input = self.parse_char_message(wparam)?;
396 self.with_input_handler(|input_handler| {
397 input_handler.replace_text_in_range(None, &input);
398 });
399
400 Some(0)
401 }
402
403 fn handle_mouse_down_msg(
404 &self,
405 handle: HWND,
406 button: MouseButton,
407 lparam: LPARAM,
408 ) -> Option<isize> {
409 unsafe { SetCapture(handle) };
410 let mut lock = self.state.borrow_mut();
411 let Some(mut func) = lock.callbacks.input.take() else {
412 return Some(1);
413 };
414 let x = lparam.signed_loword();
415 let y = lparam.signed_hiword();
416 let physical_point = point(DevicePixels(x as i32), DevicePixels(y as i32));
417 let click_count = lock.click_state.update(button, physical_point);
418 let scale_factor = lock.scale_factor;
419 drop(lock);
420
421 let input = PlatformInput::MouseDown(MouseDownEvent {
422 button,
423 position: logical_point(x as f32, y as f32, scale_factor),
424 modifiers: current_modifiers(),
425 click_count,
426 first_mouse: false,
427 });
428 let handled = !func(input).propagate;
429 self.state.borrow_mut().callbacks.input = Some(func);
430
431 if handled { Some(0) } else { Some(1) }
432 }
433
434 fn handle_mouse_up_msg(
435 &self,
436 _handle: HWND,
437 button: MouseButton,
438 lparam: LPARAM,
439 ) -> Option<isize> {
440 unsafe { ReleaseCapture().log_err() };
441 let mut lock = self.state.borrow_mut();
442 let Some(mut func) = lock.callbacks.input.take() else {
443 return Some(1);
444 };
445 let x = lparam.signed_loword() as f32;
446 let y = lparam.signed_hiword() as f32;
447 let click_count = lock.click_state.current_count;
448 let scale_factor = lock.scale_factor;
449 drop(lock);
450
451 let input = PlatformInput::MouseUp(MouseUpEvent {
452 button,
453 position: logical_point(x, y, scale_factor),
454 modifiers: current_modifiers(),
455 click_count,
456 });
457 let handled = !func(input).propagate;
458 self.state.borrow_mut().callbacks.input = Some(func);
459
460 if handled { Some(0) } else { Some(1) }
461 }
462
463 fn handle_xbutton_msg(
464 &self,
465 handle: HWND,
466 wparam: WPARAM,
467 lparam: LPARAM,
468 handler: impl Fn(&Self, HWND, MouseButton, LPARAM) -> Option<isize>,
469 ) -> Option<isize> {
470 let nav_dir = match wparam.hiword() {
471 XBUTTON1 => NavigationDirection::Back,
472 XBUTTON2 => NavigationDirection::Forward,
473 _ => return Some(1),
474 };
475 handler(self, handle, MouseButton::Navigate(nav_dir), lparam)
476 }
477
478 fn handle_mouse_wheel_msg(
479 &self,
480 handle: HWND,
481 wparam: WPARAM,
482 lparam: LPARAM,
483 ) -> Option<isize> {
484 let modifiers = current_modifiers();
485 let mut lock = self.state.borrow_mut();
486 let Some(mut func) = lock.callbacks.input.take() else {
487 return Some(1);
488 };
489 let scale_factor = lock.scale_factor;
490 let wheel_scroll_amount = match modifiers.shift {
491 true => {
492 self.system_settings()
493 .mouse_wheel_settings
494 .wheel_scroll_chars
495 }
496 false => {
497 self.system_settings()
498 .mouse_wheel_settings
499 .wheel_scroll_lines
500 }
501 };
502 drop(lock);
503
504 let wheel_distance =
505 (wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_amount as f32;
506 let mut cursor_point = POINT {
507 x: lparam.signed_loword().into(),
508 y: lparam.signed_hiword().into(),
509 };
510 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
511 let input = PlatformInput::ScrollWheel(ScrollWheelEvent {
512 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
513 delta: ScrollDelta::Lines(match modifiers.shift {
514 true => Point {
515 x: wheel_distance,
516 y: 0.0,
517 },
518 false => Point {
519 y: wheel_distance,
520 x: 0.0,
521 },
522 }),
523 modifiers,
524 touch_phase: TouchPhase::Moved,
525 });
526 let handled = !func(input).propagate;
527 self.state.borrow_mut().callbacks.input = Some(func);
528
529 if handled { Some(0) } else { Some(1) }
530 }
531
532 fn handle_mouse_horizontal_wheel_msg(
533 &self,
534 handle: HWND,
535 wparam: WPARAM,
536 lparam: LPARAM,
537 ) -> Option<isize> {
538 let mut lock = self.state.borrow_mut();
539 let Some(mut func) = lock.callbacks.input.take() else {
540 return Some(1);
541 };
542 let scale_factor = lock.scale_factor;
543 let wheel_scroll_chars = self
544 .system_settings()
545 .mouse_wheel_settings
546 .wheel_scroll_chars;
547 drop(lock);
548
549 let wheel_distance =
550 (-wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_chars as f32;
551 let mut cursor_point = POINT {
552 x: lparam.signed_loword().into(),
553 y: lparam.signed_hiword().into(),
554 };
555 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
556 let event = PlatformInput::ScrollWheel(ScrollWheelEvent {
557 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
558 delta: ScrollDelta::Lines(Point {
559 x: wheel_distance,
560 y: 0.0,
561 }),
562 modifiers: current_modifiers(),
563 touch_phase: TouchPhase::Moved,
564 });
565 let handled = !func(event).propagate;
566 self.state.borrow_mut().callbacks.input = Some(func);
567
568 if handled { Some(0) } else { Some(1) }
569 }
570
571 fn retrieve_caret_position(&self) -> Option<POINT> {
572 self.with_input_handler_and_scale_factor(|input_handler, scale_factor| {
573 let caret_range = input_handler.selected_text_range(false)?;
574 let caret_position = input_handler.bounds_for_range(caret_range.range)?;
575 Some(POINT {
576 // logical to physical
577 x: (caret_position.origin.x.0 * scale_factor) as i32,
578 y: (caret_position.origin.y.0 * scale_factor) as i32
579 + ((caret_position.size.height.0 * scale_factor) as i32 / 2),
580 })
581 })
582 }
583
584 fn handle_ime_position(&self, handle: HWND) -> Option<isize> {
585 unsafe {
586 let ctx = ImmGetContext(handle);
587
588 let Some(caret_position) = self.retrieve_caret_position() else {
589 return Some(0);
590 };
591 {
592 let config = COMPOSITIONFORM {
593 dwStyle: CFS_POINT,
594 ptCurrentPos: caret_position,
595 ..Default::default()
596 };
597 ImmSetCompositionWindow(ctx, &config as _).ok().log_err();
598 }
599 {
600 let config = CANDIDATEFORM {
601 dwStyle: CFS_CANDIDATEPOS,
602 ptCurrentPos: caret_position,
603 ..Default::default()
604 };
605 ImmSetCandidateWindow(ctx, &config as _).ok().log_err();
606 }
607 ImmReleaseContext(handle, ctx).ok().log_err();
608 Some(0)
609 }
610 }
611
612 fn handle_ime_composition(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
613 let ctx = unsafe { ImmGetContext(handle) };
614 let result = self.handle_ime_composition_inner(ctx, lparam);
615 unsafe { ImmReleaseContext(handle, ctx).ok().log_err() };
616 result
617 }
618
619 fn handle_ime_composition_inner(&self, ctx: HIMC, lparam: LPARAM) -> Option<isize> {
620 let lparam = lparam.0 as u32;
621 if lparam == 0 {
622 // Japanese IME may send this message with lparam = 0, which indicates that
623 // there is no composition string.
624 self.with_input_handler(|input_handler| {
625 input_handler.replace_text_in_range(None, "");
626 })?;
627 Some(0)
628 } else {
629 if lparam & GCS_COMPSTR.0 > 0 {
630 let comp_string = parse_ime_composition_string(ctx, GCS_COMPSTR)?;
631 let caret_pos =
632 (!comp_string.is_empty() && lparam & GCS_CURSORPOS.0 > 0).then(|| {
633 let pos = retrieve_composition_cursor_position(ctx);
634 pos..pos
635 });
636 self.with_input_handler(|input_handler| {
637 input_handler.replace_and_mark_text_in_range(None, &comp_string, caret_pos);
638 })?;
639 }
640 if lparam & GCS_RESULTSTR.0 > 0 {
641 let comp_result = parse_ime_composition_string(ctx, GCS_RESULTSTR)?;
642 self.with_input_handler(|input_handler| {
643 input_handler.replace_text_in_range(None, &comp_result);
644 })?;
645 return Some(0);
646 }
647
648 // currently, we don't care other stuff
649 None
650 }
651 }
652
653 /// SEE: https://learn.microsoft.com/en-us/windows/win32/winmsg/wm-nccalcsize
654 fn handle_calc_client_size(
655 &self,
656 handle: HWND,
657 wparam: WPARAM,
658 lparam: LPARAM,
659 ) -> Option<isize> {
660 if !self.hide_title_bar || self.state.borrow().is_fullscreen() || wparam.0 == 0 {
661 return None;
662 }
663
664 let is_maximized = self.state.borrow().is_maximized();
665 let insets = get_client_area_insets(handle, is_maximized, self.windows_version);
666 // wparam is TRUE so lparam points to an NCCALCSIZE_PARAMS structure
667 let mut params = lparam.0 as *mut NCCALCSIZE_PARAMS;
668 let mut requested_client_rect = unsafe { &mut ((*params).rgrc) };
669
670 requested_client_rect[0].left += insets.left;
671 requested_client_rect[0].top += insets.top;
672 requested_client_rect[0].right -= insets.right;
673 requested_client_rect[0].bottom -= insets.bottom;
674
675 // Fix auto hide taskbar not showing. This solution is based on the approach
676 // used by Chrome. However, it may result in one row of pixels being obscured
677 // in our client area. But as Chrome says, "there seems to be no better solution."
678 if is_maximized
679 && let Some(ref taskbar_position) = self.system_settings().auto_hide_taskbar_position
680 {
681 // For the auto-hide taskbar, adjust in by 1 pixel on taskbar edge,
682 // so the window isn't treated as a "fullscreen app", which would cause
683 // the taskbar to disappear.
684 match taskbar_position {
685 AutoHideTaskbarPosition::Left => {
686 requested_client_rect[0].left += AUTO_HIDE_TASKBAR_THICKNESS_PX
687 }
688 AutoHideTaskbarPosition::Top => {
689 requested_client_rect[0].top += AUTO_HIDE_TASKBAR_THICKNESS_PX
690 }
691 AutoHideTaskbarPosition::Right => {
692 requested_client_rect[0].right -= AUTO_HIDE_TASKBAR_THICKNESS_PX
693 }
694 AutoHideTaskbarPosition::Bottom => {
695 requested_client_rect[0].bottom -= AUTO_HIDE_TASKBAR_THICKNESS_PX
696 }
697 }
698 }
699
700 Some(0)
701 }
702
703 fn handle_activate_msg(self: &Rc<Self>, wparam: WPARAM) -> Option<isize> {
704 let activated = wparam.loword() > 0;
705 let this = self.clone();
706 self.executor
707 .spawn(async move {
708 let mut lock = this.state.borrow_mut();
709 if let Some(mut func) = lock.callbacks.active_status_change.take() {
710 drop(lock);
711 func(activated);
712 this.state.borrow_mut().callbacks.active_status_change = Some(func);
713 }
714 })
715 .detach();
716
717 None
718 }
719
720 fn handle_create_msg(&self, handle: HWND) -> Option<isize> {
721 if self.hide_title_bar {
722 notify_frame_changed(handle);
723 Some(0)
724 } else {
725 None
726 }
727 }
728
729 fn handle_dpi_changed_msg(
730 &self,
731 handle: HWND,
732 wparam: WPARAM,
733 lparam: LPARAM,
734 ) -> Option<isize> {
735 let new_dpi = wparam.loword() as f32;
736 let mut lock = self.state.borrow_mut();
737 let is_maximized = lock.is_maximized();
738 let new_scale_factor = new_dpi / USER_DEFAULT_SCREEN_DPI as f32;
739 lock.scale_factor = new_scale_factor;
740 lock.border_offset.update(handle).log_err();
741 drop(lock);
742
743 if is_maximized {
744 // Get the monitor and its work area at the new DPI
745 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONEAREST) };
746 let mut monitor_info: MONITORINFO = unsafe { std::mem::zeroed() };
747 monitor_info.cbSize = std::mem::size_of::<MONITORINFO>() as u32;
748 if unsafe { GetMonitorInfoW(monitor, &mut monitor_info) }.as_bool() {
749 let work_area = monitor_info.rcWork;
750 let width = work_area.right - work_area.left;
751 let height = work_area.bottom - work_area.top;
752
753 // Update the window size to match the new monitor work area
754 // This will trigger WM_SIZE which will handle the size change
755 unsafe {
756 SetWindowPos(
757 handle,
758 None,
759 work_area.left,
760 work_area.top,
761 width,
762 height,
763 SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED,
764 )
765 .context("unable to set maximized window position after dpi has changed")
766 .log_err();
767 }
768
769 // SetWindowPos may not send WM_SIZE for maximized windows in some cases,
770 // so we manually update the size to ensure proper rendering
771 let device_size = size(DevicePixels(width), DevicePixels(height));
772 self.handle_size_change(device_size, new_scale_factor, true);
773 }
774 } else {
775 // For non-maximized windows, use the suggested RECT from the system
776 let rect = unsafe { &*(lparam.0 as *const RECT) };
777 let width = rect.right - rect.left;
778 let height = rect.bottom - rect.top;
779 // this will emit `WM_SIZE` and `WM_MOVE` right here
780 // even before this function returns
781 // the new size is handled in `WM_SIZE`
782 unsafe {
783 SetWindowPos(
784 handle,
785 None,
786 rect.left,
787 rect.top,
788 width,
789 height,
790 SWP_NOZORDER | SWP_NOACTIVATE,
791 )
792 .context("unable to set window position after dpi has changed")
793 .log_err();
794 }
795 }
796
797 Some(0)
798 }
799
800 /// The following conditions will trigger this event:
801 /// 1. The monitor on which the window is located goes offline or changes resolution.
802 /// 2. Another monitor goes offline, is plugged in, or changes resolution.
803 ///
804 /// In either case, the window will only receive information from the monitor on which
805 /// it is located.
806 ///
807 /// For example, in the case of condition 2, where the monitor on which the window is
808 /// located has actually changed nothing, it will still receive this event.
809 fn handle_display_change_msg(&self, handle: HWND) -> Option<isize> {
810 // NOTE:
811 // Even the `lParam` holds the resolution of the screen, we just ignore it.
812 // Because WM_DPICHANGED, WM_MOVE, WM_SIZE will come first, window reposition and resize
813 // are handled there.
814 // So we only care about if monitor is disconnected.
815 let previous_monitor = self.state.borrow().display;
816 if WindowsDisplay::is_connected(previous_monitor.handle) {
817 // we are fine, other display changed
818 return None;
819 }
820 // display disconnected
821 // in this case, the OS will move our window to another monitor, and minimize it.
822 // we deminimize the window and query the monitor after moving
823 unsafe {
824 let _ = ShowWindow(handle, SW_SHOWNORMAL);
825 };
826 let new_monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
827 // all monitors disconnected
828 if new_monitor.is_invalid() {
829 log::error!("No monitor detected!");
830 return None;
831 }
832 let new_display = WindowsDisplay::new_with_handle(new_monitor).log_err()?;
833 self.state.borrow_mut().display = new_display;
834 Some(0)
835 }
836
837 fn handle_hit_test_msg(
838 &self,
839 handle: HWND,
840 msg: u32,
841 wparam: WPARAM,
842 lparam: LPARAM,
843 ) -> Option<isize> {
844 if !self.is_movable || self.state.borrow().is_fullscreen() {
845 return None;
846 }
847
848 let mut lock = self.state.borrow_mut();
849 if let Some(mut callback) = lock.callbacks.hit_test_window_control.take() {
850 drop(lock);
851 let area = callback();
852 self.state.borrow_mut().callbacks.hit_test_window_control = Some(callback);
853 if let Some(area) = area {
854 return match area {
855 WindowControlArea::Drag => Some(HTCAPTION as _),
856 WindowControlArea::Close => Some(HTCLOSE as _),
857 WindowControlArea::Max => Some(HTMAXBUTTON as _),
858 WindowControlArea::Min => Some(HTMINBUTTON as _),
859 };
860 }
861 } else {
862 drop(lock);
863 }
864
865 if !self.hide_title_bar {
866 // If the OS draws the title bar, we don't need to handle hit test messages.
867 return None;
868 }
869
870 // default handler for resize areas
871 let hit = unsafe { DefWindowProcW(handle, msg, wparam, lparam) };
872 if matches!(
873 hit.0 as u32,
874 HTNOWHERE
875 | HTRIGHT
876 | HTLEFT
877 | HTTOPLEFT
878 | HTTOP
879 | HTTOPRIGHT
880 | HTBOTTOMRIGHT
881 | HTBOTTOM
882 | HTBOTTOMLEFT
883 ) {
884 return Some(hit.0);
885 }
886
887 if self.state.borrow().is_fullscreen() {
888 return Some(HTCLIENT as _);
889 }
890
891 let dpi = unsafe { GetDpiForWindow(handle) };
892 let frame_y = unsafe { GetSystemMetricsForDpi(SM_CYFRAME, dpi) };
893
894 let mut cursor_point = POINT {
895 x: lparam.signed_loword().into(),
896 y: lparam.signed_hiword().into(),
897 };
898 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
899 if !self.state.borrow().is_maximized() && cursor_point.y >= 0 && cursor_point.y <= frame_y {
900 return Some(HTTOP as _);
901 }
902
903 Some(HTCLIENT as _)
904 }
905
906 fn handle_nc_mouse_move_msg(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
907 self.start_tracking_mouse(handle, TME_LEAVE | TME_NONCLIENT);
908
909 let mut lock = self.state.borrow_mut();
910 let mut func = lock.callbacks.input.take()?;
911 let scale_factor = lock.scale_factor;
912 drop(lock);
913
914 let mut cursor_point = POINT {
915 x: lparam.signed_loword().into(),
916 y: lparam.signed_hiword().into(),
917 };
918 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
919 let input = PlatformInput::MouseMove(MouseMoveEvent {
920 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
921 pressed_button: None,
922 modifiers: current_modifiers(),
923 });
924 let handled = !func(input).propagate;
925 self.state.borrow_mut().callbacks.input = Some(func);
926
927 if handled { Some(0) } else { None }
928 }
929
930 fn handle_nc_mouse_down_msg(
931 &self,
932 handle: HWND,
933 button: MouseButton,
934 wparam: WPARAM,
935 lparam: LPARAM,
936 ) -> Option<isize> {
937 let mut lock = self.state.borrow_mut();
938 if let Some(mut func) = lock.callbacks.input.take() {
939 let scale_factor = lock.scale_factor;
940 let mut cursor_point = POINT {
941 x: lparam.signed_loword().into(),
942 y: lparam.signed_hiword().into(),
943 };
944 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
945 let physical_point = point(DevicePixels(cursor_point.x), DevicePixels(cursor_point.y));
946 let click_count = lock.click_state.update(button, physical_point);
947 drop(lock);
948
949 let input = PlatformInput::MouseDown(MouseDownEvent {
950 button,
951 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
952 modifiers: current_modifiers(),
953 click_count,
954 first_mouse: false,
955 });
956 let result = func(input);
957 let handled = !result.propagate || result.default_prevented;
958 self.state.borrow_mut().callbacks.input = Some(func);
959
960 if handled {
961 return Some(0);
962 }
963 } else {
964 drop(lock);
965 };
966
967 // Since these are handled in handle_nc_mouse_up_msg we must prevent the default window proc
968 if button == MouseButton::Left {
969 match wparam.0 as u32 {
970 HTMINBUTTON => self.state.borrow_mut().nc_button_pressed = Some(HTMINBUTTON),
971 HTMAXBUTTON => self.state.borrow_mut().nc_button_pressed = Some(HTMAXBUTTON),
972 HTCLOSE => self.state.borrow_mut().nc_button_pressed = Some(HTCLOSE),
973 _ => return None,
974 };
975 Some(0)
976 } else {
977 None
978 }
979 }
980
981 fn handle_nc_mouse_up_msg(
982 &self,
983 handle: HWND,
984 button: MouseButton,
985 wparam: WPARAM,
986 lparam: LPARAM,
987 ) -> Option<isize> {
988 let mut lock = self.state.borrow_mut();
989 if let Some(mut func) = lock.callbacks.input.take() {
990 let scale_factor = lock.scale_factor;
991 drop(lock);
992
993 let mut cursor_point = POINT {
994 x: lparam.signed_loword().into(),
995 y: lparam.signed_hiword().into(),
996 };
997 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
998 let input = PlatformInput::MouseUp(MouseUpEvent {
999 button,
1000 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1001 modifiers: current_modifiers(),
1002 click_count: 1,
1003 });
1004 let handled = !func(input).propagate;
1005 self.state.borrow_mut().callbacks.input = Some(func);
1006
1007 if handled {
1008 return Some(0);
1009 }
1010 } else {
1011 drop(lock);
1012 }
1013
1014 let last_pressed = self.state.borrow_mut().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.borrow().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 mut state = self.state.borrow_mut();
1050 let had_cursor = state.current_cursor.is_some();
1051
1052 state.current_cursor = if lparam.0 == 0 {
1053 None
1054 } else {
1055 Some(HCURSOR(lparam.0 as _))
1056 };
1057
1058 if had_cursor != state.current_cursor.is_some() {
1059 unsafe { SetCursor(state.current_cursor) };
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.borrow().current_cursor);
1083 };
1084 Some(1)
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 let mut lock = self.state.borrow_mut();
1095 let display = lock.display;
1096 lock.click_state.system_update(wparam.0);
1097 lock.border_offset.update(handle).log_err();
1098 // system settings may emit a window message which wants to take the refcell lock, so drop it
1099 drop(lock);
1100 self.system_settings_mut().update(display, wparam.0);
1101 } else {
1102 self.handle_system_theme_changed(handle, lparam)?;
1103 };
1104 // Force to trigger WM_NCCALCSIZE event to ensure that we handle auto hide
1105 // taskbar correctly.
1106 notify_frame_changed(handle);
1107
1108 Some(0)
1109 }
1110
1111 fn handle_system_theme_changed(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
1112 // lParam is a pointer to a string that indicates the area containing the system parameter
1113 // that was changed.
1114 let parameter = PCWSTR::from_raw(lparam.0 as _);
1115 if unsafe { !parameter.is_null() && !parameter.is_empty() }
1116 && let Some(parameter_string) = unsafe { parameter.to_string() }.log_err()
1117 {
1118 log::info!("System settings changed: {}", parameter_string);
1119 if parameter_string.as_str() == "ImmersiveColorSet" {
1120 let new_appearance = system_appearance()
1121 .context("unable to get system appearance when handling ImmersiveColorSet")
1122 .log_err()?;
1123 let mut lock = self.state.borrow_mut();
1124 if new_appearance != lock.appearance {
1125 lock.appearance = new_appearance;
1126 let mut callback = lock.callbacks.appearance_changed.take()?;
1127 drop(lock);
1128 callback();
1129 self.state.borrow_mut().callbacks.appearance_changed = Some(callback);
1130 configure_dwm_dark_mode(handle, new_appearance);
1131 }
1132 }
1133 }
1134 Some(0)
1135 }
1136
1137 fn handle_input_language_changed(&self) -> Option<isize> {
1138 unsafe {
1139 PostMessageW(
1140 Some(self.platform_window_handle),
1141 WM_GPUI_KEYBOARD_LAYOUT_CHANGED,
1142 WPARAM(self.validation_number),
1143 LPARAM(0),
1144 )
1145 .log_err();
1146 }
1147 Some(0)
1148 }
1149
1150 fn handle_window_visibility_changed(&self, handle: HWND, wparam: WPARAM) -> Option<isize> {
1151 if wparam.0 == 1 {
1152 self.draw_window(handle, false);
1153 }
1154 None
1155 }
1156
1157 fn handle_device_lost(&self, lparam: LPARAM) -> Option<isize> {
1158 let mut lock = self.state.borrow_mut();
1159 let devices = lparam.0 as *const DirectXDevices;
1160 let devices = unsafe { &*devices };
1161 if let Err(err) = lock.renderer.handle_device_lost(&devices) {
1162 panic!("Device lost: {err}");
1163 }
1164 Some(0)
1165 }
1166
1167 #[inline]
1168 fn draw_window(&self, handle: HWND, force_render: bool) -> Option<isize> {
1169 let mut request_frame = self.state.borrow_mut().callbacks.request_frame.take()?;
1170
1171 // we are instructing gpui to force render a frame, this will
1172 // re-populate all the gpu textures for us so we can resume drawing in
1173 // case we disabled drawing earlier due to a device loss
1174 self.state.borrow_mut().renderer.mark_drawable();
1175 request_frame(RequestFrameOptions {
1176 require_presentation: false,
1177 force_render,
1178 });
1179
1180 self.state.borrow_mut().callbacks.request_frame = Some(request_frame);
1181 unsafe { ValidateRect(Some(handle), None).ok().log_err() };
1182
1183 Some(0)
1184 }
1185
1186 #[inline]
1187 fn parse_char_message(&self, wparam: WPARAM) -> Option<String> {
1188 let code_point = wparam.loword();
1189 let mut lock = self.state.borrow_mut();
1190 // https://www.unicode.org/versions/Unicode16.0.0/core-spec/chapter-3/#G2630
1191 match code_point {
1192 0xD800..=0xDBFF => {
1193 // High surrogate, wait for low surrogate
1194 lock.pending_surrogate = Some(code_point);
1195 None
1196 }
1197 0xDC00..=0xDFFF => {
1198 if let Some(high_surrogate) = lock.pending_surrogate.take() {
1199 // Low surrogate, combine with pending high surrogate
1200 String::from_utf16(&[high_surrogate, code_point]).ok()
1201 } else {
1202 // Invalid low surrogate without a preceding high surrogate
1203 log::warn!(
1204 "Received low surrogate without a preceding high surrogate: {code_point:x}"
1205 );
1206 None
1207 }
1208 }
1209 _ => {
1210 lock.pending_surrogate = None;
1211 char::from_u32(code_point as u32)
1212 .filter(|c| !c.is_control())
1213 .map(|c| c.to_string())
1214 }
1215 }
1216 }
1217
1218 fn start_tracking_mouse(&self, handle: HWND, flags: TRACKMOUSEEVENT_FLAGS) {
1219 let mut lock = self.state.borrow_mut();
1220 if !lock.hovered {
1221 lock.hovered = true;
1222 unsafe {
1223 TrackMouseEvent(&mut TRACKMOUSEEVENT {
1224 cbSize: std::mem::size_of::<TRACKMOUSEEVENT>() as u32,
1225 dwFlags: flags,
1226 hwndTrack: handle,
1227 dwHoverTime: HOVER_DEFAULT,
1228 })
1229 .log_err()
1230 };
1231 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
1232 drop(lock);
1233 callback(true);
1234 self.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
1235 }
1236 }
1237 }
1238
1239 fn with_input_handler<F, R>(&self, f: F) -> Option<R>
1240 where
1241 F: FnOnce(&mut PlatformInputHandler) -> R,
1242 {
1243 let mut input_handler = self.state.borrow_mut().input_handler.take()?;
1244 let result = f(&mut input_handler);
1245 self.state.borrow_mut().input_handler = Some(input_handler);
1246 Some(result)
1247 }
1248
1249 fn with_input_handler_and_scale_factor<F, R>(&self, f: F) -> Option<R>
1250 where
1251 F: FnOnce(&mut PlatformInputHandler, f32) -> Option<R>,
1252 {
1253 let mut lock = self.state.borrow_mut();
1254 let mut input_handler = lock.input_handler.take()?;
1255 let scale_factor = lock.scale_factor;
1256 drop(lock);
1257 let result = f(&mut input_handler, scale_factor);
1258 self.state.borrow_mut().input_handler = Some(input_handler);
1259 result
1260 }
1261}
1262
1263fn handle_key_event<F>(
1264 wparam: WPARAM,
1265 lparam: LPARAM,
1266 state: &mut WindowsWindowState,
1267 f: F,
1268) -> Option<PlatformInput>
1269where
1270 F: FnOnce(Keystroke, bool) -> PlatformInput,
1271{
1272 let virtual_key = VIRTUAL_KEY(wparam.loword());
1273 let modifiers = current_modifiers();
1274
1275 match virtual_key {
1276 VK_SHIFT | VK_CONTROL | VK_MENU | VK_LMENU | VK_RMENU | VK_LWIN | VK_RWIN => {
1277 if state
1278 .last_reported_modifiers
1279 .is_some_and(|prev_modifiers| prev_modifiers == modifiers)
1280 {
1281 return None;
1282 }
1283 state.last_reported_modifiers = Some(modifiers);
1284 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1285 modifiers,
1286 capslock: current_capslock(),
1287 }))
1288 }
1289 VK_PACKET => None,
1290 VK_CAPITAL => {
1291 let capslock = current_capslock();
1292 if state
1293 .last_reported_capslock
1294 .is_some_and(|prev_capslock| prev_capslock == capslock)
1295 {
1296 return None;
1297 }
1298 state.last_reported_capslock = Some(capslock);
1299 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1300 modifiers,
1301 capslock,
1302 }))
1303 }
1304 vkey => {
1305 let keystroke = parse_normal_key(vkey, lparam, modifiers)?;
1306 Some(f(keystroke.0, keystroke.1))
1307 }
1308 }
1309}
1310
1311fn parse_immutable(vkey: VIRTUAL_KEY) -> Option<String> {
1312 Some(
1313 match vkey {
1314 VK_SPACE => "space",
1315 VK_BACK => "backspace",
1316 VK_RETURN => "enter",
1317 VK_TAB => "tab",
1318 VK_UP => "up",
1319 VK_DOWN => "down",
1320 VK_RIGHT => "right",
1321 VK_LEFT => "left",
1322 VK_HOME => "home",
1323 VK_END => "end",
1324 VK_PRIOR => "pageup",
1325 VK_NEXT => "pagedown",
1326 VK_BROWSER_BACK => "back",
1327 VK_BROWSER_FORWARD => "forward",
1328 VK_ESCAPE => "escape",
1329 VK_INSERT => "insert",
1330 VK_DELETE => "delete",
1331 VK_APPS => "menu",
1332 VK_F1 => "f1",
1333 VK_F2 => "f2",
1334 VK_F3 => "f3",
1335 VK_F4 => "f4",
1336 VK_F5 => "f5",
1337 VK_F6 => "f6",
1338 VK_F7 => "f7",
1339 VK_F8 => "f8",
1340 VK_F9 => "f9",
1341 VK_F10 => "f10",
1342 VK_F11 => "f11",
1343 VK_F12 => "f12",
1344 VK_F13 => "f13",
1345 VK_F14 => "f14",
1346 VK_F15 => "f15",
1347 VK_F16 => "f16",
1348 VK_F17 => "f17",
1349 VK_F18 => "f18",
1350 VK_F19 => "f19",
1351 VK_F20 => "f20",
1352 VK_F21 => "f21",
1353 VK_F22 => "f22",
1354 VK_F23 => "f23",
1355 VK_F24 => "f24",
1356 _ => return None,
1357 }
1358 .to_string(),
1359 )
1360}
1361
1362fn parse_normal_key(
1363 vkey: VIRTUAL_KEY,
1364 lparam: LPARAM,
1365 mut modifiers: Modifiers,
1366) -> Option<(Keystroke, bool)> {
1367 let (key_char, prefer_character_input) = process_key(vkey, lparam.hiword());
1368
1369 let key = parse_immutable(vkey).or_else(|| {
1370 let scan_code = lparam.hiword() & 0xFF;
1371 get_keystroke_key(vkey, scan_code as u32, &mut modifiers)
1372 })?;
1373
1374 Some((
1375 Keystroke {
1376 modifiers,
1377 key,
1378 key_char,
1379 },
1380 prefer_character_input,
1381 ))
1382}
1383
1384fn process_key(vkey: VIRTUAL_KEY, scan_code: u16) -> (Option<String>, bool) {
1385 let mut keyboard_state = [0u8; 256];
1386 unsafe {
1387 if GetKeyboardState(&mut keyboard_state).is_err() {
1388 return (None, false);
1389 }
1390 }
1391
1392 let mut buffer_c = [0u16; 8];
1393 let result_c = unsafe {
1394 ToUnicode(
1395 vkey.0 as u32,
1396 scan_code as u32,
1397 Some(&keyboard_state),
1398 &mut buffer_c,
1399 0x4,
1400 )
1401 };
1402
1403 if result_c == 0 {
1404 return (None, false);
1405 }
1406
1407 let c = &buffer_c[..result_c.unsigned_abs() as usize];
1408 let key_char = String::from_utf16(c)
1409 .ok()
1410 .filter(|s| !s.is_empty() && !s.chars().next().unwrap().is_control());
1411
1412 if result_c < 0 {
1413 return (key_char, true);
1414 }
1415
1416 if key_char.is_none() {
1417 return (None, false);
1418 }
1419
1420 // Workaround for some bug that makes the compiler think keyboard_state is still zeroed out
1421 let keyboard_state = std::hint::black_box(keyboard_state);
1422 let ctrl_down = (keyboard_state[VK_CONTROL.0 as usize] & 0x80) != 0;
1423 let alt_down = (keyboard_state[VK_MENU.0 as usize] & 0x80) != 0;
1424 let win_down = (keyboard_state[VK_LWIN.0 as usize] & 0x80) != 0
1425 || (keyboard_state[VK_RWIN.0 as usize] & 0x80) != 0;
1426
1427 let has_modifiers = ctrl_down || alt_down || win_down;
1428 if !has_modifiers {
1429 return (key_char, false);
1430 }
1431
1432 let mut state_no_modifiers = keyboard_state;
1433 state_no_modifiers[VK_CONTROL.0 as usize] = 0;
1434 state_no_modifiers[VK_LCONTROL.0 as usize] = 0;
1435 state_no_modifiers[VK_RCONTROL.0 as usize] = 0;
1436 state_no_modifiers[VK_MENU.0 as usize] = 0;
1437 state_no_modifiers[VK_LMENU.0 as usize] = 0;
1438 state_no_modifiers[VK_RMENU.0 as usize] = 0;
1439 state_no_modifiers[VK_LWIN.0 as usize] = 0;
1440 state_no_modifiers[VK_RWIN.0 as usize] = 0;
1441
1442 let mut buffer_c_no_modifiers = [0u16; 8];
1443 let result_c_no_modifiers = unsafe {
1444 ToUnicode(
1445 vkey.0 as u32,
1446 scan_code as u32,
1447 Some(&state_no_modifiers),
1448 &mut buffer_c_no_modifiers,
1449 0x4,
1450 )
1451 };
1452
1453 let c_no_modifiers = &buffer_c_no_modifiers[..result_c_no_modifiers.unsigned_abs() as usize];
1454 (
1455 key_char,
1456 result_c != result_c_no_modifiers || c != c_no_modifiers,
1457 )
1458}
1459
1460fn parse_ime_composition_string(ctx: HIMC, comp_type: IME_COMPOSITION_STRING) -> Option<String> {
1461 unsafe {
1462 let string_len = ImmGetCompositionStringW(ctx, comp_type, None, 0);
1463 if string_len >= 0 {
1464 let mut buffer = vec![0u8; string_len as usize + 2];
1465 ImmGetCompositionStringW(
1466 ctx,
1467 comp_type,
1468 Some(buffer.as_mut_ptr() as _),
1469 string_len as _,
1470 );
1471 let wstring = std::slice::from_raw_parts::<u16>(
1472 buffer.as_mut_ptr().cast::<u16>(),
1473 string_len as usize / 2,
1474 );
1475 Some(String::from_utf16_lossy(wstring))
1476 } else {
1477 None
1478 }
1479 }
1480}
1481
1482#[inline]
1483fn retrieve_composition_cursor_position(ctx: HIMC) -> usize {
1484 unsafe { ImmGetCompositionStringW(ctx, GCS_CURSORPOS, None, 0) as usize }
1485}
1486
1487#[inline]
1488fn is_virtual_key_pressed(vkey: VIRTUAL_KEY) -> bool {
1489 unsafe { GetKeyState(vkey.0 as i32) < 0 }
1490}
1491
1492#[inline]
1493pub(crate) fn current_modifiers() -> Modifiers {
1494 Modifiers {
1495 control: is_virtual_key_pressed(VK_CONTROL),
1496 alt: is_virtual_key_pressed(VK_MENU),
1497 shift: is_virtual_key_pressed(VK_SHIFT),
1498 platform: is_virtual_key_pressed(VK_LWIN) || is_virtual_key_pressed(VK_RWIN),
1499 function: false,
1500 }
1501}
1502
1503#[inline]
1504pub(crate) fn current_capslock() -> Capslock {
1505 let on = unsafe { GetKeyState(VK_CAPITAL.0 as i32) & 1 } > 0;
1506 Capslock { on }
1507}
1508
1509fn get_client_area_insets(
1510 handle: HWND,
1511 is_maximized: bool,
1512 windows_version: WindowsVersion,
1513) -> RECT {
1514 // For maximized windows, Windows outdents the window rect from the screen's client rect
1515 // by `frame_thickness` on each edge, meaning `insets` must contain `frame_thickness`
1516 // on all sides (including the top) to avoid the client area extending onto adjacent
1517 // monitors.
1518 //
1519 // For non-maximized windows, things become complicated:
1520 //
1521 // - On Windows 10
1522 // The top inset must be zero, since if there is any nonclient area, Windows will draw
1523 // a full native titlebar outside the client area. (This doesn't occur in the maximized
1524 // case.)
1525 //
1526 // - On Windows 11
1527 // The top inset is calculated using an empirical formula that I derived through various
1528 // tests. Without this, the top 1-2 rows of pixels in our window would be obscured.
1529 let dpi = unsafe { GetDpiForWindow(handle) };
1530 let frame_thickness = get_frame_thickness(dpi);
1531 let top_insets = if is_maximized {
1532 frame_thickness
1533 } else {
1534 match windows_version {
1535 WindowsVersion::Win10 => 0,
1536 WindowsVersion::Win11 => (dpi as f32 / USER_DEFAULT_SCREEN_DPI as f32).round() as i32,
1537 }
1538 };
1539 RECT {
1540 left: frame_thickness,
1541 top: top_insets,
1542 right: frame_thickness,
1543 bottom: frame_thickness,
1544 }
1545}
1546
1547// there is some additional non-visible space when talking about window
1548// borders on Windows:
1549// - SM_CXSIZEFRAME: The resize handle.
1550// - SM_CXPADDEDBORDER: Additional border space that isn't part of the resize handle.
1551fn get_frame_thickness(dpi: u32) -> i32 {
1552 let resize_frame_thickness = unsafe { GetSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) };
1553 let padding_thickness = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
1554 resize_frame_thickness + padding_thickness
1555}
1556
1557fn notify_frame_changed(handle: HWND) {
1558 unsafe {
1559 SetWindowPos(
1560 handle,
1561 None,
1562 0,
1563 0,
1564 0,
1565 0,
1566 SWP_FRAMECHANGED
1567 | SWP_NOACTIVATE
1568 | SWP_NOCOPYBITS
1569 | SWP_NOMOVE
1570 | SWP_NOOWNERZORDER
1571 | SWP_NOREPOSITION
1572 | SWP_NOSENDCHANGING
1573 | SWP_NOSIZE
1574 | SWP_NOZORDER,
1575 )
1576 .log_err();
1577 }
1578}