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