1use std::rc::Rc;
2
3use ::util::ResultExt;
4use anyhow::Context as _;
5use windows::{
6 Win32::{
7 Foundation::*,
8 Graphics::Gdi::*,
9 System::SystemServices::*,
10 UI::{
11 Controls::*,
12 HiDpi::*,
13 Input::{Ime::*, KeyboardAndMouse::*},
14 WindowsAndMessaging::*,
15 },
16 },
17 core::PCWSTR,
18};
19
20use crate::*;
21use gpui::*;
22
23pub(crate) const WM_GPUI_CURSOR_STYLE_CHANGED: u32 = WM_USER + 1;
24pub(crate) const WM_GPUI_CLOSE_ONE_WINDOW: u32 = WM_USER + 2;
25pub(crate) const WM_GPUI_TASK_DISPATCHED_ON_MAIN_THREAD: u32 = WM_USER + 3;
26pub(crate) const WM_GPUI_DOCK_MENU_ACTION: u32 = WM_USER + 4;
27pub(crate) const WM_GPUI_FORCE_UPDATE_WINDOW: u32 = WM_USER + 5;
28pub(crate) const WM_GPUI_KEYBOARD_LAYOUT_CHANGED: u32 = WM_USER + 6;
29pub(crate) const WM_GPUI_GPU_DEVICE_LOST: u32 = WM_USER + 7;
30pub(crate) const WM_GPUI_KEYDOWN: u32 = WM_USER + 8;
31
32const SIZE_MOVE_LOOP_TIMER_ID: usize = 1;
33
34impl WindowsWindowInner {
35 pub(crate) fn handle_msg(
36 self: &Rc<Self>,
37 handle: HWND,
38 msg: u32,
39 wparam: WPARAM,
40 lparam: LPARAM,
41 ) -> LRESULT {
42 let handled = match msg {
43 // eagerly activate the window, so calls to `active_window` will work correctly
44 WM_MOUSEACTIVATE => {
45 unsafe { SetActiveWindow(handle).ok() };
46 None
47 }
48 WM_ACTIVATE => self.handle_activate_msg(wparam),
49 WM_CREATE => self.handle_create_msg(handle),
50 WM_MOVE => self.handle_move_msg(handle, lparam),
51 WM_SIZE => self.handle_size_msg(wparam, lparam),
52 WM_GETMINMAXINFO => self.handle_get_min_max_info_msg(lparam),
53 WM_ENTERSIZEMOVE | WM_ENTERMENULOOP => self.handle_size_move_loop(handle),
54 WM_EXITSIZEMOVE | WM_EXITMENULOOP => self.handle_size_move_loop_exit(handle),
55 WM_TIMER => self.handle_timer_msg(handle, wparam),
56 WM_NCCALCSIZE => self.handle_calc_client_size(handle, wparam, lparam),
57 WM_DPICHANGED => self.handle_dpi_changed_msg(handle, wparam, lparam),
58 WM_DISPLAYCHANGE => self.handle_display_change_msg(handle),
59 WM_NCHITTEST => self.handle_hit_test_msg(handle, lparam),
60 WM_PAINT => self.handle_paint_msg(handle),
61 WM_CLOSE => self.handle_close_msg(),
62 WM_DESTROY => self.handle_destroy_msg(handle),
63 WM_MOUSEMOVE => self.handle_mouse_move_msg(handle, lparam, wparam),
64 WM_MOUSELEAVE | WM_NCMOUSELEAVE => self.handle_mouse_leave_msg(),
65 WM_NCMOUSEMOVE => self.handle_nc_mouse_move_msg(handle, lparam),
66 // Treat double click as a second single click, since we track the double clicks ourselves.
67 // If you don't interact with any elements, this will fall through to the windows default
68 // behavior of toggling whether the window is maximized.
69 WM_NCLBUTTONDBLCLK | WM_NCLBUTTONDOWN => {
70 self.handle_nc_mouse_down_msg(handle, MouseButton::Left, wparam, lparam)
71 }
72 WM_NCRBUTTONDOWN => {
73 self.handle_nc_mouse_down_msg(handle, MouseButton::Right, wparam, lparam)
74 }
75 WM_NCMBUTTONDOWN => {
76 self.handle_nc_mouse_down_msg(handle, MouseButton::Middle, wparam, lparam)
77 }
78 WM_NCLBUTTONUP => {
79 self.handle_nc_mouse_up_msg(handle, MouseButton::Left, wparam, lparam)
80 }
81 WM_NCRBUTTONUP => {
82 self.handle_nc_mouse_up_msg(handle, MouseButton::Right, wparam, lparam)
83 }
84 WM_NCMBUTTONUP => {
85 self.handle_nc_mouse_up_msg(handle, MouseButton::Middle, wparam, lparam)
86 }
87 WM_LBUTTONDOWN => self.handle_mouse_down_msg(handle, MouseButton::Left, lparam),
88 WM_RBUTTONDOWN => self.handle_mouse_down_msg(handle, MouseButton::Right, lparam),
89 WM_MBUTTONDOWN => self.handle_mouse_down_msg(handle, MouseButton::Middle, lparam),
90 WM_XBUTTONDOWN => {
91 self.handle_xbutton_msg(handle, wparam, lparam, Self::handle_mouse_down_msg)
92 }
93 WM_LBUTTONUP => self.handle_mouse_up_msg(handle, MouseButton::Left, lparam),
94 WM_RBUTTONUP => self.handle_mouse_up_msg(handle, MouseButton::Right, lparam),
95 WM_MBUTTONUP => self.handle_mouse_up_msg(handle, MouseButton::Middle, lparam),
96 WM_XBUTTONUP => {
97 self.handle_xbutton_msg(handle, wparam, lparam, Self::handle_mouse_up_msg)
98 }
99 WM_MOUSEWHEEL => self.handle_mouse_wheel_msg(handle, wparam, lparam),
100 WM_MOUSEHWHEEL => self.handle_mouse_horizontal_wheel_msg(handle, wparam, lparam),
101 WM_SYSKEYUP => self.handle_syskeyup_msg(wparam, lparam),
102 WM_KEYUP => self.handle_keyup_msg(wparam, lparam),
103 WM_GPUI_KEYDOWN => self.handle_keydown_msg(wparam, lparam),
104 WM_CHAR => self.handle_char_msg(wparam),
105 WM_IME_STARTCOMPOSITION => self.handle_ime_position(handle),
106 WM_IME_COMPOSITION => self.handle_ime_composition(handle, lparam),
107 WM_SETCURSOR => self.handle_set_cursor(handle, lparam),
108 WM_SETTINGCHANGE => self.handle_system_settings_changed(handle, wparam, lparam),
109 WM_INPUTLANGCHANGE => self.handle_input_language_changed(),
110 WM_SHOWWINDOW => self.handle_window_visibility_changed(handle, wparam),
111 WM_GPUI_CURSOR_STYLE_CHANGED => self.handle_cursor_changed(lparam),
112 WM_GPUI_FORCE_UPDATE_WINDOW => self.draw_window(handle, true),
113 WM_GPUI_GPU_DEVICE_LOST => self.handle_device_lost(lparam),
114 _ => 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.as_f32() + size.width.as_f32() / 2.;
132 let center_y = origin.y.as_f32() + size.height.as_f32() / 2.;
133 let monitor_bounds = self.state.display.get().bounds();
134 if center_x < monitor_bounds.left().as_f32()
135 || center_x > monitor_bounds.right().as_f32()
136 || center_y < monitor_bounds.top().as_f32()
137 || center_y > monitor_bounds.bottom().as_f32()
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 = min_size.width.scale(scale_factor).as_f32() as i32
165 + boarder_offset.width_offset.get();
166 minmax_info.ptMinTrackSize.y = min_size.height.scale(scale_factor).as_f32() as i32
167 + 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.as_f32() * scale_factor) as i32,
582 y: (caret_position.origin.y.as_f32() * scale_factor) as i32
583 + ((caret_position.size.height.as_f32() * 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 let Some(ctx) = ImeContext::get(handle) else {
597 return;
598 };
599 unsafe {
600 ImmSetCompositionWindow(
601 *ctx,
602 &COMPOSITIONFORM {
603 dwStyle: CFS_POINT,
604 ptCurrentPos: caret_position,
605 ..Default::default()
606 },
607 )
608 .ok()
609 .log_err();
610
611 ImmSetCandidateWindow(
612 *ctx,
613 &CANDIDATEFORM {
614 dwStyle: CFS_CANDIDATEPOS,
615 ptCurrentPos: caret_position,
616 ..Default::default()
617 },
618 )
619 .ok()
620 .log_err();
621 }
622 }
623
624 fn update_ime_enabled(&self, handle: HWND) {
625 let ime_enabled = self
626 .with_input_handler(|input_handler| input_handler.query_accepts_text_input())
627 .unwrap_or(false);
628 if ime_enabled == self.state.ime_enabled.get() {
629 return;
630 }
631 self.state.ime_enabled.set(ime_enabled);
632 unsafe {
633 if ime_enabled {
634 ImmAssociateContextEx(handle, HIMC::default(), IACE_DEFAULT)
635 .ok()
636 .log_err();
637 } else {
638 if let Some(ctx) = ImeContext::get(handle) {
639 ImmNotifyIME(*ctx, NI_COMPOSITIONSTR, CPS_COMPLETE, 0)
640 .ok()
641 .log_err();
642 }
643 ImmAssociateContextEx(handle, HIMC::default(), 0)
644 .ok()
645 .log_err();
646 }
647 }
648 }
649
650 fn handle_ime_composition(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
651 let ctx = ImeContext::get(handle)?;
652 self.handle_ime_composition_inner(*ctx, lparam)
653 }
654
655 fn handle_ime_composition_inner(&self, ctx: HIMC, lparam: LPARAM) -> Option<isize> {
656 let lparam = lparam.0 as u32;
657 if lparam == 0 {
658 // Japanese IME may send this message with lparam = 0, which indicates that
659 // there is no composition string.
660 self.with_input_handler(|input_handler| {
661 input_handler.replace_text_in_range(None, "");
662 })?;
663 Some(0)
664 } else {
665 if lparam & GCS_RESULTSTR.0 > 0 {
666 let comp_result = parse_ime_composition_string(ctx, GCS_RESULTSTR)?;
667 self.with_input_handler(|input_handler| {
668 input_handler
669 .replace_text_in_range(None, &String::from_utf16_lossy(&comp_result));
670 })?;
671 }
672 if lparam & GCS_COMPSTR.0 > 0 {
673 let comp_string = parse_ime_composition_string(ctx, GCS_COMPSTR)?;
674 let caret_pos =
675 (!comp_string.is_empty() && lparam & GCS_CURSORPOS.0 > 0).then(|| {
676 let cursor_pos = retrieve_composition_cursor_position(ctx);
677 let pos = if should_use_ime_cursor_position(ctx, cursor_pos) {
678 cursor_pos
679 } else {
680 comp_string.len()
681 };
682 pos..pos
683 });
684 self.with_input_handler(|input_handler| {
685 input_handler.replace_and_mark_text_in_range(
686 None,
687 &String::from_utf16_lossy(&comp_string),
688 caret_pos,
689 );
690 })?;
691 }
692 if lparam & (GCS_RESULTSTR.0 | GCS_COMPSTR.0) > 0 {
693 return Some(0);
694 }
695
696 // currently, we don't care other stuff
697 None
698 }
699 }
700
701 fn handle_calc_client_size(
702 &self,
703 handle: HWND,
704 wparam: WPARAM,
705 lparam: LPARAM,
706 ) -> Option<isize> {
707 if !self.hide_title_bar || self.state.is_fullscreen() || wparam.0 == 0 {
708 return None;
709 }
710
711 unsafe {
712 let params = lparam.0 as *mut NCCALCSIZE_PARAMS;
713 let saved_top = (*params).rgrc[0].top;
714 let result = DefWindowProcW(handle, WM_NCCALCSIZE, wparam, lparam);
715 (*params).rgrc[0].top = saved_top;
716 if self.state.is_maximized() {
717 let dpi = GetDpiForWindow(handle);
718 (*params).rgrc[0].top += get_frame_thicknessx(dpi);
719 }
720 Some(result.0 as isize)
721 }
722 }
723
724 fn handle_activate_msg(self: &Rc<Self>, wparam: WPARAM) -> Option<isize> {
725 let activated = wparam.loword() > 0;
726 let this = self.clone();
727 self.executor
728 .spawn(async move {
729 if let Some(mut func) = this.state.callbacks.active_status_change.take() {
730 func(activated);
731 this.state.callbacks.active_status_change.set(Some(func));
732 }
733 })
734 .detach();
735
736 None
737 }
738
739 fn handle_create_msg(&self, handle: HWND) -> Option<isize> {
740 if self.hide_title_bar {
741 notify_frame_changed(handle);
742 Some(0)
743 } else {
744 None
745 }
746 }
747
748 fn handle_dpi_changed_msg(
749 &self,
750 handle: HWND,
751 wparam: WPARAM,
752 lparam: LPARAM,
753 ) -> Option<isize> {
754 let new_dpi = wparam.loword() as f32;
755
756 let is_maximized = self.state.is_maximized();
757 let new_scale_factor = new_dpi / USER_DEFAULT_SCREEN_DPI as f32;
758 self.state.scale_factor.set(new_scale_factor);
759 self.state.border_offset.update(handle).log_err();
760
761 if is_maximized {
762 // Get the monitor and its work area at the new DPI
763 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONEAREST) };
764 let mut monitor_info: MONITORINFO = unsafe { std::mem::zeroed() };
765 monitor_info.cbSize = std::mem::size_of::<MONITORINFO>() as u32;
766 if unsafe { GetMonitorInfoW(monitor, &mut monitor_info) }.as_bool() {
767 let work_area = monitor_info.rcWork;
768 let width = work_area.right - work_area.left;
769 let height = work_area.bottom - work_area.top;
770
771 // Update the window size to match the new monitor work area
772 // This will trigger WM_SIZE which will handle the size change
773 unsafe {
774 SetWindowPos(
775 handle,
776 None,
777 work_area.left,
778 work_area.top,
779 width,
780 height,
781 SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED,
782 )
783 .context("unable to set maximized window position after dpi has changed")
784 .log_err();
785 }
786
787 // SetWindowPos may not send WM_SIZE for maximized windows in some cases,
788 // so we manually update the size to ensure proper rendering
789 let device_size = size(DevicePixels(width), DevicePixels(height));
790 self.handle_size_change(device_size, new_scale_factor, true);
791 }
792 } else {
793 // For non-maximized windows, use the suggested RECT from the system
794 let rect = unsafe { &*(lparam.0 as *const RECT) };
795 let width = rect.right - rect.left;
796 let height = rect.bottom - rect.top;
797 // this will emit `WM_SIZE` and `WM_MOVE` right here
798 // even before this function returns
799 // the new size is handled in `WM_SIZE`
800 unsafe {
801 SetWindowPos(
802 handle,
803 None,
804 rect.left,
805 rect.top,
806 width,
807 height,
808 SWP_NOZORDER | SWP_NOACTIVATE,
809 )
810 .context("unable to set window position after dpi has changed")
811 .log_err();
812 }
813 }
814
815 Some(0)
816 }
817
818 fn handle_display_change_msg(&self, handle: HWND) -> Option<isize> {
819 let new_monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
820 if new_monitor.is_invalid() {
821 log::error!("No monitor detected!");
822 return None;
823 }
824 let new_display = WindowsDisplay::new_with_handle(new_monitor).log_err()?;
825 self.state.display.set(new_display);
826 Some(0)
827 }
828
829 fn handle_hit_test_msg(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
830 if !self.is_movable || self.state.is_fullscreen() {
831 return None;
832 }
833
834 let callback = self.state.callbacks.hit_test_window_control.take();
835 let drag_area = if let Some(mut callback) = callback {
836 let area = callback();
837 self.state
838 .callbacks
839 .hit_test_window_control
840 .set(Some(callback));
841 if let Some(area) = area {
842 match area {
843 WindowControlArea::Drag => Some(HTCAPTION as _),
844 WindowControlArea::Close => return Some(HTCLOSE as _),
845 WindowControlArea::Max => return Some(HTMAXBUTTON as _),
846 WindowControlArea::Min => return Some(HTMINBUTTON as _),
847 }
848 } else {
849 None
850 }
851 } else {
852 None
853 };
854
855 if !self.hide_title_bar {
856 // If the OS draws the title bar, we don't need to handle hit test messages.
857 return drag_area;
858 }
859
860 let dpi = unsafe { GetDpiForWindow(handle) };
861 // We do not use the OS title bar, so the default `DefWindowProcW` will only register a 1px edge for resizes
862 // We need to calculate the frame thickness ourselves and do the hit test manually.
863 let frame_y = get_frame_thicknessx(dpi);
864 let frame_x = get_frame_thicknessy(dpi);
865 let mut cursor_point = POINT {
866 x: lparam.signed_loword().into(),
867 y: lparam.signed_hiword().into(),
868 };
869
870 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
871 if !self.state.is_maximized() && 0 <= cursor_point.y && cursor_point.y <= frame_y {
872 // x-axis actually goes from -frame_x to 0
873 return Some(if cursor_point.x <= 0 {
874 HTTOPLEFT
875 } else {
876 let mut rect = Default::default();
877 unsafe { GetWindowRect(handle, &mut rect) }.log_err();
878 // right and bottom bounds of RECT are exclusive, thus `-1`
879 let right = rect.right - rect.left - 1;
880 // the bounds include the padding frames, so accomodate for both of them
881 if right - 2 * frame_x <= cursor_point.x {
882 HTTOPRIGHT
883 } else {
884 HTTOP
885 }
886 } as _);
887 }
888
889 drag_area
890 }
891
892 fn handle_nc_mouse_move_msg(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
893 self.start_tracking_mouse(handle, TME_LEAVE | TME_NONCLIENT);
894
895 let mut func = self.state.callbacks.input.take()?;
896 let scale_factor = self.state.scale_factor.get();
897
898 let mut cursor_point = POINT {
899 x: lparam.signed_loword().into(),
900 y: lparam.signed_hiword().into(),
901 };
902 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
903 let input = PlatformInput::MouseMove(MouseMoveEvent {
904 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
905 pressed_button: None,
906 modifiers: current_modifiers(),
907 });
908 let handled = !func(input).propagate;
909 self.state.callbacks.input.set(Some(func));
910
911 if handled { Some(0) } else { None }
912 }
913
914 fn handle_nc_mouse_down_msg(
915 &self,
916 handle: HWND,
917 button: MouseButton,
918 wparam: WPARAM,
919 lparam: LPARAM,
920 ) -> Option<isize> {
921 if let Some(mut func) = self.state.callbacks.input.take() {
922 let scale_factor = self.state.scale_factor.get();
923 let mut cursor_point = POINT {
924 x: lparam.signed_loword().into(),
925 y: lparam.signed_hiword().into(),
926 };
927 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
928 let physical_point = point(DevicePixels(cursor_point.x), DevicePixels(cursor_point.y));
929 let click_count = self.state.click_state.update(button, physical_point);
930
931 let input = PlatformInput::MouseDown(MouseDownEvent {
932 button,
933 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
934 modifiers: current_modifiers(),
935 click_count,
936 first_mouse: false,
937 });
938 let handled = !func(input).propagate;
939 self.state.callbacks.input.set(Some(func));
940
941 if handled {
942 return Some(0);
943 }
944 } else {
945 };
946
947 // Since these are handled in handle_nc_mouse_up_msg we must prevent the default window proc
948 if button == MouseButton::Left {
949 match wparam.0 as u32 {
950 HTMINBUTTON => self.state.nc_button_pressed.set(Some(HTMINBUTTON)),
951 HTMAXBUTTON => self.state.nc_button_pressed.set(Some(HTMAXBUTTON)),
952 HTCLOSE => self.state.nc_button_pressed.set(Some(HTCLOSE)),
953 _ => return None,
954 };
955 Some(0)
956 } else {
957 None
958 }
959 }
960
961 fn handle_nc_mouse_up_msg(
962 &self,
963 handle: HWND,
964 button: MouseButton,
965 wparam: WPARAM,
966 lparam: LPARAM,
967 ) -> Option<isize> {
968 if let Some(mut func) = self.state.callbacks.input.take() {
969 let scale_factor = self.state.scale_factor.get();
970
971 let mut cursor_point = POINT {
972 x: lparam.signed_loword().into(),
973 y: lparam.signed_hiword().into(),
974 };
975 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
976 let input = PlatformInput::MouseUp(MouseUpEvent {
977 button,
978 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
979 modifiers: current_modifiers(),
980 click_count: 1,
981 });
982 let handled = !func(input).propagate;
983 self.state.callbacks.input.set(Some(func));
984
985 if handled {
986 return Some(0);
987 }
988 } else {
989 }
990
991 let last_pressed = self.state.nc_button_pressed.take();
992 if button == MouseButton::Left
993 && let Some(last_pressed) = last_pressed
994 {
995 let handled = match (wparam.0 as u32, last_pressed) {
996 (HTMINBUTTON, HTMINBUTTON) => {
997 unsafe { ShowWindowAsync(handle, SW_MINIMIZE).ok().log_err() };
998 true
999 }
1000 (HTMAXBUTTON, HTMAXBUTTON) => {
1001 if self.state.is_maximized() {
1002 unsafe { ShowWindowAsync(handle, SW_NORMAL).ok().log_err() };
1003 } else {
1004 unsafe { ShowWindowAsync(handle, SW_MAXIMIZE).ok().log_err() };
1005 }
1006 true
1007 }
1008 (HTCLOSE, HTCLOSE) => {
1009 unsafe {
1010 PostMessageW(Some(handle), WM_CLOSE, WPARAM::default(), LPARAM::default())
1011 .log_err()
1012 };
1013 true
1014 }
1015 _ => false,
1016 };
1017 if handled {
1018 return Some(0);
1019 }
1020 }
1021
1022 None
1023 }
1024
1025 fn handle_cursor_changed(&self, lparam: LPARAM) -> Option<isize> {
1026 let had_cursor = self.state.current_cursor.get().is_some();
1027
1028 self.state.current_cursor.set(if lparam.0 == 0 {
1029 None
1030 } else {
1031 Some(HCURSOR(lparam.0 as _))
1032 });
1033
1034 if had_cursor != self.state.current_cursor.get().is_some() {
1035 unsafe { SetCursor(self.state.current_cursor.get()) };
1036 }
1037
1038 Some(0)
1039 }
1040
1041 fn handle_set_cursor(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
1042 if unsafe { !IsWindowEnabled(handle).as_bool() }
1043 || matches!(
1044 lparam.loword() as u32,
1045 HTLEFT
1046 | HTRIGHT
1047 | HTTOP
1048 | HTTOPLEFT
1049 | HTTOPRIGHT
1050 | HTBOTTOM
1051 | HTBOTTOMLEFT
1052 | HTBOTTOMRIGHT
1053 )
1054 {
1055 return None;
1056 }
1057 unsafe {
1058 SetCursor(self.state.current_cursor.get());
1059 };
1060 Some(0)
1061 }
1062
1063 fn handle_system_settings_changed(
1064 &self,
1065 handle: HWND,
1066 wparam: WPARAM,
1067 lparam: LPARAM,
1068 ) -> Option<isize> {
1069 if wparam.0 != 0 {
1070 self.state.click_state.system_update(wparam.0);
1071 self.state.border_offset.update(handle).log_err();
1072 // system settings may emit a window message which wants to take the refcell self.state, so drop it
1073
1074 self.system_settings().update(wparam.0);
1075 } else {
1076 self.handle_system_theme_changed(handle, lparam)?;
1077 };
1078
1079 Some(0)
1080 }
1081
1082 fn handle_system_theme_changed(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
1083 // lParam is a pointer to a string that indicates the area containing the system parameter
1084 // that was changed.
1085 let parameter = PCWSTR::from_raw(lparam.0 as _);
1086 if unsafe { !parameter.is_null() && !parameter.is_empty() }
1087 && let Some(parameter_string) = unsafe { parameter.to_string() }.log_err()
1088 {
1089 log::info!("System settings changed: {}", parameter_string);
1090 if parameter_string.as_str() == "ImmersiveColorSet" {
1091 let new_appearance = system_appearance()
1092 .context("unable to get system appearance when handling ImmersiveColorSet")
1093 .log_err()?;
1094
1095 if new_appearance != self.state.appearance.get() {
1096 self.state.appearance.set(new_appearance);
1097 let mut callback = self.state.callbacks.appearance_changed.take()?;
1098
1099 callback();
1100 self.state.callbacks.appearance_changed.set(Some(callback));
1101 configure_dwm_dark_mode(handle, new_appearance);
1102 }
1103 }
1104 }
1105 Some(0)
1106 }
1107
1108 fn handle_input_language_changed(&self) -> Option<isize> {
1109 unsafe {
1110 PostMessageW(
1111 Some(self.platform_window_handle),
1112 WM_GPUI_KEYBOARD_LAYOUT_CHANGED,
1113 WPARAM(self.validation_number),
1114 LPARAM(0),
1115 )
1116 .log_err();
1117 }
1118 Some(0)
1119 }
1120
1121 fn handle_window_visibility_changed(&self, handle: HWND, wparam: WPARAM) -> Option<isize> {
1122 if wparam.0 == 1 {
1123 self.draw_window(handle, false);
1124 }
1125 None
1126 }
1127
1128 fn handle_device_lost(&self, lparam: LPARAM) -> Option<isize> {
1129 let devices = lparam.0 as *const DirectXDevices;
1130 let devices = unsafe { &*devices };
1131 if let Err(err) = self
1132 .state
1133 .renderer
1134 .borrow_mut()
1135 .handle_device_lost(&devices)
1136 {
1137 panic!("Device lost: {err}");
1138 }
1139 Some(0)
1140 }
1141
1142 #[inline]
1143 fn draw_window(&self, handle: HWND, force_render: bool) -> Option<isize> {
1144 let mut request_frame = self.state.callbacks.request_frame.take()?;
1145
1146 // we are instructing gpui to force render a frame, this will
1147 // re-populate all the gpu textures for us so we can resume drawing in
1148 // case we disabled drawing earlier due to a device loss
1149 self.state.renderer.borrow_mut().mark_drawable();
1150 request_frame(RequestFrameOptions {
1151 require_presentation: false,
1152 force_render,
1153 });
1154
1155 self.state.callbacks.request_frame.set(Some(request_frame));
1156 self.update_ime_enabled(handle);
1157 unsafe { ValidateRect(Some(handle), None).ok().log_err() };
1158
1159 Some(0)
1160 }
1161
1162 #[inline]
1163 fn parse_char_message(&self, wparam: WPARAM) -> Option<String> {
1164 let code_point = wparam.loword();
1165
1166 // https://www.unicode.org/versions/Unicode16.0.0/core-spec/chapter-3/#G2630
1167 match code_point {
1168 0xD800..=0xDBFF => {
1169 // High surrogate, wait for low surrogate
1170 self.state.pending_surrogate.set(Some(code_point));
1171 None
1172 }
1173 0xDC00..=0xDFFF => {
1174 if let Some(high_surrogate) = self.state.pending_surrogate.take() {
1175 // Low surrogate, combine with pending high surrogate
1176 String::from_utf16(&[high_surrogate, code_point]).ok()
1177 } else {
1178 // Invalid low surrogate without a preceding high surrogate
1179 log::warn!(
1180 "Received low surrogate without a preceding high surrogate: {code_point:x}"
1181 );
1182 None
1183 }
1184 }
1185 _ => {
1186 self.state.pending_surrogate.set(None);
1187 char::from_u32(code_point as u32)
1188 .filter(|c| !c.is_control())
1189 .map(|c| c.to_string())
1190 }
1191 }
1192 }
1193
1194 fn start_tracking_mouse(&self, handle: HWND, flags: TRACKMOUSEEVENT_FLAGS) {
1195 if !self.state.hovered.get() {
1196 self.state.hovered.set(true);
1197 unsafe {
1198 TrackMouseEvent(&mut TRACKMOUSEEVENT {
1199 cbSize: std::mem::size_of::<TRACKMOUSEEVENT>() as u32,
1200 dwFlags: flags,
1201 hwndTrack: handle,
1202 dwHoverTime: HOVER_DEFAULT,
1203 })
1204 .log_err()
1205 };
1206 if let Some(mut callback) = self.state.callbacks.hovered_status_change.take() {
1207 callback(true);
1208 self.state
1209 .callbacks
1210 .hovered_status_change
1211 .set(Some(callback));
1212 }
1213 }
1214 }
1215
1216 fn with_input_handler<F, R>(&self, f: F) -> Option<R>
1217 where
1218 F: FnOnce(&mut PlatformInputHandler) -> R,
1219 {
1220 let mut input_handler = self.state.input_handler.take()?;
1221 let result = f(&mut input_handler);
1222 self.state.input_handler.set(Some(input_handler));
1223 Some(result)
1224 }
1225
1226 fn with_input_handler_and_scale_factor<F, R>(&self, f: F) -> Option<R>
1227 where
1228 F: FnOnce(&mut PlatformInputHandler, f32) -> Option<R>,
1229 {
1230 let mut input_handler = self.state.input_handler.take()?;
1231 let scale_factor = self.state.scale_factor.get();
1232
1233 let result = f(&mut input_handler, scale_factor);
1234 self.state.input_handler.set(Some(input_handler));
1235 result
1236 }
1237}
1238
1239struct ImeContext {
1240 hwnd: HWND,
1241 himc: HIMC,
1242}
1243
1244impl ImeContext {
1245 fn get(hwnd: HWND) -> Option<Self> {
1246 let himc = unsafe { ImmGetContext(hwnd) };
1247 if himc.is_invalid() {
1248 return None;
1249 }
1250 Some(Self { hwnd, himc })
1251 }
1252}
1253
1254impl std::ops::Deref for ImeContext {
1255 type Target = HIMC;
1256 fn deref(&self) -> &HIMC {
1257 &self.himc
1258 }
1259}
1260
1261impl Drop for ImeContext {
1262 fn drop(&mut self) {
1263 unsafe {
1264 ImmReleaseContext(self.hwnd, self.himc).ok().log_err();
1265 }
1266 }
1267}
1268
1269fn handle_key_event<F>(
1270 wparam: WPARAM,
1271 lparam: LPARAM,
1272 state: &WindowsWindowState,
1273 f: F,
1274) -> Option<PlatformInput>
1275where
1276 F: FnOnce(Keystroke, bool) -> PlatformInput,
1277{
1278 let virtual_key = VIRTUAL_KEY(wparam.loword());
1279 let modifiers = current_modifiers();
1280
1281 match virtual_key {
1282 VK_SHIFT | VK_CONTROL | VK_MENU | VK_LMENU | VK_RMENU | VK_LWIN | VK_RWIN => {
1283 if state
1284 .last_reported_modifiers
1285 .get()
1286 .is_some_and(|prev_modifiers| prev_modifiers == modifiers)
1287 {
1288 return None;
1289 }
1290 state.last_reported_modifiers.set(Some(modifiers));
1291 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1292 modifiers,
1293 capslock: current_capslock(),
1294 }))
1295 }
1296 VK_PACKET => None,
1297 VK_CAPITAL => {
1298 let capslock = current_capslock();
1299 if state
1300 .last_reported_capslock
1301 .get()
1302 .is_some_and(|prev_capslock| prev_capslock == capslock)
1303 {
1304 return None;
1305 }
1306 state.last_reported_capslock.set(Some(capslock));
1307 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1308 modifiers,
1309 capslock,
1310 }))
1311 }
1312 vkey => {
1313 let keystroke = parse_normal_key(vkey, lparam, modifiers)?;
1314 Some(f(keystroke.0, keystroke.1))
1315 }
1316 }
1317}
1318
1319fn parse_immutable(vkey: VIRTUAL_KEY) -> Option<String> {
1320 Some(
1321 match vkey {
1322 VK_SPACE => "space",
1323 VK_BACK => "backspace",
1324 VK_RETURN => "enter",
1325 VK_TAB => "tab",
1326 VK_UP => "up",
1327 VK_DOWN => "down",
1328 VK_RIGHT => "right",
1329 VK_LEFT => "left",
1330 VK_HOME => "home",
1331 VK_END => "end",
1332 VK_PRIOR => "pageup",
1333 VK_NEXT => "pagedown",
1334 VK_BROWSER_BACK => "back",
1335 VK_BROWSER_FORWARD => "forward",
1336 VK_ESCAPE => "escape",
1337 VK_INSERT => "insert",
1338 VK_DELETE => "delete",
1339 VK_APPS => "menu",
1340 VK_F1 => "f1",
1341 VK_F2 => "f2",
1342 VK_F3 => "f3",
1343 VK_F4 => "f4",
1344 VK_F5 => "f5",
1345 VK_F6 => "f6",
1346 VK_F7 => "f7",
1347 VK_F8 => "f8",
1348 VK_F9 => "f9",
1349 VK_F10 => "f10",
1350 VK_F11 => "f11",
1351 VK_F12 => "f12",
1352 VK_F13 => "f13",
1353 VK_F14 => "f14",
1354 VK_F15 => "f15",
1355 VK_F16 => "f16",
1356 VK_F17 => "f17",
1357 VK_F18 => "f18",
1358 VK_F19 => "f19",
1359 VK_F20 => "f20",
1360 VK_F21 => "f21",
1361 VK_F22 => "f22",
1362 VK_F23 => "f23",
1363 VK_F24 => "f24",
1364 _ => return None,
1365 }
1366 .to_string(),
1367 )
1368}
1369
1370fn parse_normal_key(
1371 vkey: VIRTUAL_KEY,
1372 lparam: LPARAM,
1373 mut modifiers: Modifiers,
1374) -> Option<(Keystroke, bool)> {
1375 let (key_char, prefer_character_input) = process_key(vkey, lparam.hiword());
1376
1377 let key = parse_immutable(vkey).or_else(|| {
1378 let scan_code = lparam.hiword() & 0xFF;
1379 get_keystroke_key(vkey, scan_code as u32, &mut modifiers)
1380 })?;
1381
1382 Some((
1383 Keystroke {
1384 modifiers,
1385 key,
1386 key_char,
1387 },
1388 prefer_character_input,
1389 ))
1390}
1391
1392fn process_key(vkey: VIRTUAL_KEY, scan_code: u16) -> (Option<String>, bool) {
1393 let mut keyboard_state = [0u8; 256];
1394 unsafe {
1395 if GetKeyboardState(&mut keyboard_state).is_err() {
1396 return (None, false);
1397 }
1398 }
1399
1400 let mut buffer_c = [0u16; 8];
1401 let result_c = unsafe {
1402 ToUnicode(
1403 vkey.0 as u32,
1404 scan_code as u32,
1405 Some(&keyboard_state),
1406 &mut buffer_c,
1407 0x4,
1408 )
1409 };
1410
1411 if result_c == 0 {
1412 return (None, false);
1413 }
1414
1415 let c = &buffer_c[..result_c.unsigned_abs() as usize];
1416 let key_char = String::from_utf16(c)
1417 .ok()
1418 .filter(|s| !s.is_empty() && !s.chars().next().unwrap().is_control());
1419
1420 if result_c < 0 {
1421 return (key_char, true);
1422 }
1423
1424 if key_char.is_none() {
1425 return (None, false);
1426 }
1427
1428 // Workaround for some bug that makes the compiler think keyboard_state is still zeroed out
1429 let keyboard_state = std::hint::black_box(keyboard_state);
1430 let ctrl_down = (keyboard_state[VK_CONTROL.0 as usize] & 0x80) != 0;
1431 let alt_down = (keyboard_state[VK_MENU.0 as usize] & 0x80) != 0;
1432 let win_down = (keyboard_state[VK_LWIN.0 as usize] & 0x80) != 0
1433 || (keyboard_state[VK_RWIN.0 as usize] & 0x80) != 0;
1434
1435 let has_modifiers = ctrl_down || alt_down || win_down;
1436 if !has_modifiers {
1437 return (key_char, false);
1438 }
1439
1440 let mut state_no_modifiers = keyboard_state;
1441 state_no_modifiers[VK_CONTROL.0 as usize] = 0;
1442 state_no_modifiers[VK_LCONTROL.0 as usize] = 0;
1443 state_no_modifiers[VK_RCONTROL.0 as usize] = 0;
1444 state_no_modifiers[VK_MENU.0 as usize] = 0;
1445 state_no_modifiers[VK_LMENU.0 as usize] = 0;
1446 state_no_modifiers[VK_RMENU.0 as usize] = 0;
1447 state_no_modifiers[VK_LWIN.0 as usize] = 0;
1448 state_no_modifiers[VK_RWIN.0 as usize] = 0;
1449
1450 let mut buffer_c_no_modifiers = [0u16; 8];
1451 let result_c_no_modifiers = unsafe {
1452 ToUnicode(
1453 vkey.0 as u32,
1454 scan_code as u32,
1455 Some(&state_no_modifiers),
1456 &mut buffer_c_no_modifiers,
1457 0x4,
1458 )
1459 };
1460
1461 let c_no_modifiers = &buffer_c_no_modifiers[..result_c_no_modifiers.unsigned_abs() as usize];
1462 (
1463 key_char,
1464 result_c != result_c_no_modifiers || c != c_no_modifiers,
1465 )
1466}
1467
1468fn parse_ime_composition_string(ctx: HIMC, comp_type: IME_COMPOSITION_STRING) -> Option<Vec<u16>> {
1469 unsafe {
1470 let string_len = ImmGetCompositionStringW(ctx, comp_type, None, 0);
1471 if string_len >= 0 {
1472 let mut buffer = vec![0u8; string_len as usize + 2];
1473 ImmGetCompositionStringW(
1474 ctx,
1475 comp_type,
1476 Some(buffer.as_mut_ptr() as _),
1477 string_len as _,
1478 );
1479 let wstring = std::slice::from_raw_parts::<u16>(
1480 buffer.as_mut_ptr().cast::<u16>(),
1481 string_len as usize / 2,
1482 );
1483 Some(wstring.to_vec())
1484 } else {
1485 None
1486 }
1487 }
1488}
1489
1490#[inline]
1491fn retrieve_composition_cursor_position(ctx: HIMC) -> usize {
1492 unsafe { ImmGetCompositionStringW(ctx, GCS_CURSORPOS, None, 0) as usize }
1493}
1494
1495fn should_use_ime_cursor_position(ctx: HIMC, cursor_pos: usize) -> bool {
1496 let attrs_size = unsafe { ImmGetCompositionStringW(ctx, GCS_COMPATTR, None, 0) } as usize;
1497 if attrs_size == 0 {
1498 return false;
1499 }
1500
1501 let mut attrs = vec![0u8; attrs_size];
1502 let result = unsafe {
1503 ImmGetCompositionStringW(
1504 ctx,
1505 GCS_COMPATTR,
1506 Some(attrs.as_mut_ptr() as *mut _),
1507 attrs_size as u32,
1508 )
1509 };
1510 if result <= 0 {
1511 return false;
1512 }
1513
1514 // Keep the cursor adjacent to the inserted text by only using the suggested position
1515 // if it's adjacent to unconverted text.
1516 let at_cursor_is_input = cursor_pos < attrs.len() && attrs[cursor_pos] == (ATTR_INPUT as u8);
1517 let before_cursor_is_input = cursor_pos > 0
1518 && (cursor_pos - 1) < attrs.len()
1519 && attrs[cursor_pos - 1] == (ATTR_INPUT as u8);
1520
1521 at_cursor_is_input || before_cursor_is_input
1522}
1523
1524#[inline]
1525fn is_virtual_key_pressed(vkey: VIRTUAL_KEY) -> bool {
1526 unsafe { GetKeyState(vkey.0 as i32) < 0 }
1527}
1528
1529#[inline]
1530pub(crate) fn current_modifiers() -> Modifiers {
1531 Modifiers {
1532 control: is_virtual_key_pressed(VK_CONTROL),
1533 alt: is_virtual_key_pressed(VK_MENU),
1534 shift: is_virtual_key_pressed(VK_SHIFT),
1535 platform: is_virtual_key_pressed(VK_LWIN) || is_virtual_key_pressed(VK_RWIN),
1536 function: false,
1537 }
1538}
1539
1540#[inline]
1541pub(crate) fn current_capslock() -> Capslock {
1542 let on = unsafe { GetKeyState(VK_CAPITAL.0 as i32) & 1 } > 0;
1543 Capslock { on }
1544}
1545
1546// there is some additional non-visible space when talking about window
1547// borders on Windows:
1548// - SM_CXSIZEFRAME: The resize handle.
1549// - SM_CXPADDEDBORDER: Additional border space that isn't part of the resize handle.
1550fn get_frame_thicknessx(dpi: u32) -> i32 {
1551 let resize_frame_thickness = unsafe { GetSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) };
1552 let padding_thickness = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
1553 resize_frame_thickness + padding_thickness
1554}
1555
1556fn get_frame_thicknessy(dpi: u32) -> i32 {
1557 let resize_frame_thickness = unsafe { GetSystemMetricsForDpi(SM_CYSIZEFRAME, dpi) };
1558 let padding_thickness = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
1559 resize_frame_thickness + padding_thickness
1560}
1561
1562fn notify_frame_changed(handle: HWND) {
1563 unsafe {
1564 SetWindowPos(
1565 handle,
1566 None,
1567 0,
1568 0,
1569 0,
1570 0,
1571 SWP_FRAMECHANGED
1572 | SWP_NOACTIVATE
1573 | SWP_NOCOPYBITS
1574 | SWP_NOMOVE
1575 | SWP_NOOWNERZORDER
1576 | SWP_NOREPOSITION
1577 | SWP_NOSENDCHANGING
1578 | SWP_NOSIZE
1579 | SWP_NOZORDER,
1580 )
1581 .log_err();
1582 }
1583}