1use std::rc::Rc;
2
3use ::util::ResultExt;
4use anyhow::Context as _;
5use windows::{
6 Win32::{
7 Foundation::*,
8 Graphics::Gdi::*,
9 System::SystemServices::*,
10 UI::{
11 Controls::*,
12 HiDpi::*,
13 Input::{Ime::*, KeyboardAndMouse::*},
14 WindowsAndMessaging::*,
15 },
16 },
17 core::PCWSTR,
18};
19
20use crate::*;
21
22pub(crate) const WM_GPUI_CURSOR_STYLE_CHANGED: u32 = WM_USER + 1;
23pub(crate) const WM_GPUI_CLOSE_ONE_WINDOW: u32 = WM_USER + 2;
24pub(crate) const WM_GPUI_TASK_DISPATCHED_ON_MAIN_THREAD: u32 = WM_USER + 3;
25pub(crate) const WM_GPUI_DOCK_MENU_ACTION: u32 = WM_USER + 4;
26pub(crate) const WM_GPUI_FORCE_UPDATE_WINDOW: u32 = WM_USER + 5;
27pub(crate) const WM_GPUI_KEYBOARD_LAYOUT_CHANGED: u32 = WM_USER + 6;
28pub(crate) const WM_GPUI_GPU_DEVICE_LOST: u32 = WM_USER + 7;
29pub(crate) const WM_GPUI_KEYDOWN: u32 = WM_USER + 8;
30
31const SIZE_MOVE_LOOP_TIMER_ID: usize = 1;
32
33impl WindowsWindowInner {
34 pub(crate) fn handle_msg(
35 self: &Rc<Self>,
36 handle: HWND,
37 msg: u32,
38 wparam: WPARAM,
39 lparam: LPARAM,
40 ) -> LRESULT {
41 let handled = match msg {
42 // eagerly activate the window, so calls to `active_window` will work correctly
43 WM_MOUSEACTIVATE => {
44 unsafe { SetActiveWindow(handle).ok() };
45 None
46 }
47 WM_ACTIVATE => self.handle_activate_msg(wparam),
48 WM_CREATE => self.handle_create_msg(handle),
49 WM_MOVE => self.handle_move_msg(handle, lparam),
50 WM_SIZE => self.handle_size_msg(wparam, lparam),
51 WM_GETMINMAXINFO => self.handle_get_min_max_info_msg(lparam),
52 WM_ENTERSIZEMOVE | WM_ENTERMENULOOP => self.handle_size_move_loop(handle),
53 WM_EXITSIZEMOVE | WM_EXITMENULOOP => self.handle_size_move_loop_exit(handle),
54 WM_TIMER => self.handle_timer_msg(handle, wparam),
55 WM_NCCALCSIZE => self.handle_calc_client_size(handle, wparam, lparam),
56 WM_DPICHANGED => self.handle_dpi_changed_msg(handle, wparam, lparam),
57 WM_DISPLAYCHANGE => self.handle_display_change_msg(handle),
58 WM_NCHITTEST => self.handle_hit_test_msg(handle, lparam),
59 WM_PAINT => self.handle_paint_msg(handle),
60 WM_CLOSE => self.handle_close_msg(),
61 WM_DESTROY => self.handle_destroy_msg(handle),
62 WM_MOUSEMOVE => self.handle_mouse_move_msg(handle, lparam, wparam),
63 WM_MOUSELEAVE | WM_NCMOUSELEAVE => self.handle_mouse_leave_msg(),
64 WM_NCMOUSEMOVE => self.handle_nc_mouse_move_msg(handle, lparam),
65 // Treat double click as a second single click, since we track the double clicks ourselves.
66 // If you don't interact with any elements, this will fall through to the windows default
67 // behavior of toggling whether the window is maximized.
68 WM_NCLBUTTONDBLCLK | WM_NCLBUTTONDOWN => {
69 self.handle_nc_mouse_down_msg(handle, MouseButton::Left, wparam, lparam)
70 }
71 WM_NCRBUTTONDOWN => {
72 self.handle_nc_mouse_down_msg(handle, MouseButton::Right, wparam, lparam)
73 }
74 WM_NCMBUTTONDOWN => {
75 self.handle_nc_mouse_down_msg(handle, MouseButton::Middle, wparam, lparam)
76 }
77 WM_NCLBUTTONUP => {
78 self.handle_nc_mouse_up_msg(handle, MouseButton::Left, wparam, lparam)
79 }
80 WM_NCRBUTTONUP => {
81 self.handle_nc_mouse_up_msg(handle, MouseButton::Right, wparam, lparam)
82 }
83 WM_NCMBUTTONUP => {
84 self.handle_nc_mouse_up_msg(handle, MouseButton::Middle, wparam, lparam)
85 }
86 WM_LBUTTONDOWN => self.handle_mouse_down_msg(handle, MouseButton::Left, lparam),
87 WM_RBUTTONDOWN => self.handle_mouse_down_msg(handle, MouseButton::Right, lparam),
88 WM_MBUTTONDOWN => self.handle_mouse_down_msg(handle, MouseButton::Middle, lparam),
89 WM_XBUTTONDOWN => {
90 self.handle_xbutton_msg(handle, wparam, lparam, Self::handle_mouse_down_msg)
91 }
92 WM_LBUTTONUP => self.handle_mouse_up_msg(handle, MouseButton::Left, lparam),
93 WM_RBUTTONUP => self.handle_mouse_up_msg(handle, MouseButton::Right, lparam),
94 WM_MBUTTONUP => self.handle_mouse_up_msg(handle, MouseButton::Middle, lparam),
95 WM_XBUTTONUP => {
96 self.handle_xbutton_msg(handle, wparam, lparam, Self::handle_mouse_up_msg)
97 }
98 WM_MOUSEWHEEL => self.handle_mouse_wheel_msg(handle, wparam, lparam),
99 WM_MOUSEHWHEEL => self.handle_mouse_horizontal_wheel_msg(handle, wparam, lparam),
100 WM_SYSKEYUP => self.handle_syskeyup_msg(wparam, lparam),
101 WM_KEYUP => self.handle_keyup_msg(wparam, lparam),
102 WM_GPUI_KEYDOWN => self.handle_keydown_msg(wparam, lparam),
103 WM_CHAR => self.handle_char_msg(wparam),
104 WM_IME_STARTCOMPOSITION => self.handle_ime_position(handle),
105 WM_IME_COMPOSITION => self.handle_ime_composition(handle, lparam),
106 WM_SETCURSOR => self.handle_set_cursor(handle, lparam),
107 WM_SETTINGCHANGE => self.handle_system_settings_changed(handle, wparam, lparam),
108 WM_INPUTLANGCHANGE => self.handle_input_language_changed(),
109 WM_SHOWWINDOW => self.handle_window_visibility_changed(handle, wparam),
110 WM_GPUI_CURSOR_STYLE_CHANGED => self.handle_cursor_changed(lparam),
111 WM_GPUI_FORCE_UPDATE_WINDOW => self.draw_window(handle, true),
112 WM_GPUI_GPU_DEVICE_LOST => self.handle_device_lost(lparam),
113 _ => None,
114 };
115 if let Some(n) = handled {
116 LRESULT(n)
117 } else {
118 unsafe { DefWindowProcW(handle, msg, wparam, lparam) }
119 }
120 }
121
122 fn handle_move_msg(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
123 let origin = logical_point(
124 lparam.signed_loword() as f32,
125 lparam.signed_hiword() as f32,
126 self.state.scale_factor.get(),
127 );
128 self.state.origin.set(origin);
129 let size = self.state.logical_size.get();
130 let center_x = origin.x.0 + size.width.0 / 2.;
131 let center_y = origin.y.0 + size.height.0 / 2.;
132 let monitor_bounds = self.state.display.get().bounds();
133 if center_x < monitor_bounds.left().0
134 || center_x > monitor_bounds.right().0
135 || center_y < monitor_bounds.top().0
136 || center_y > monitor_bounds.bottom().0
137 {
138 // center of the window may have moved to another monitor
139 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
140 // minimize the window can trigger this event too, in this case,
141 // monitor is invalid, we do nothing.
142 if !monitor.is_invalid() && self.state.display.get().handle != monitor {
143 // we will get the same monitor if we only have one
144 self.state
145 .display
146 .set(WindowsDisplay::new_with_handle(monitor).log_err()?);
147 }
148 }
149 if let Some(mut callback) = self.state.callbacks.moved.take() {
150 callback();
151 self.state.callbacks.moved.set(Some(callback));
152 }
153 Some(0)
154 }
155
156 fn handle_get_min_max_info_msg(&self, lparam: LPARAM) -> Option<isize> {
157 let min_size = self.state.min_size?;
158 let scale_factor = self.state.scale_factor.get();
159 let boarder_offset = &self.state.border_offset;
160
161 unsafe {
162 let minmax_info = &mut *(lparam.0 as *mut MINMAXINFO);
163 minmax_info.ptMinTrackSize.x =
164 min_size.width.scale(scale_factor).0 as i32 + boarder_offset.width_offset.get();
165 minmax_info.ptMinTrackSize.y =
166 min_size.height.scale(scale_factor).0 as i32 + boarder_offset.height_offset.get();
167 }
168 Some(0)
169 }
170
171 fn handle_size_msg(&self, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
172 // Don't resize the renderer when the window is minimized, but record that it was minimized so
173 // that on restore the swap chain can be recreated via `update_drawable_size_even_if_unchanged`.
174 if wparam.0 == SIZE_MINIMIZED as usize {
175 self.state
176 .restore_from_minimized
177 .set(self.state.callbacks.request_frame.take());
178 return Some(0);
179 }
180
181 let width = lparam.loword().max(1) as i32;
182 let height = lparam.hiword().max(1) as i32;
183 let new_size = size(DevicePixels(width), DevicePixels(height));
184
185 let scale_factor = self.state.scale_factor.get();
186 let mut should_resize_renderer = false;
187 if let Some(restore_from_minimized) = self.state.restore_from_minimized.take() {
188 self.state
189 .callbacks
190 .request_frame
191 .set(Some(restore_from_minimized));
192 } else {
193 should_resize_renderer = true;
194 }
195
196 self.handle_size_change(new_size, scale_factor, should_resize_renderer);
197 Some(0)
198 }
199
200 fn handle_size_change(
201 &self,
202 device_size: Size<DevicePixels>,
203 scale_factor: f32,
204 should_resize_renderer: bool,
205 ) {
206 let new_logical_size = device_size.to_pixels(scale_factor);
207
208 self.state.logical_size.set(new_logical_size);
209 if should_resize_renderer
210 && let Err(e) = self.state.renderer.borrow_mut().resize(device_size)
211 {
212 log::error!("Failed to resize renderer, invalidating devices: {}", e);
213 self.state
214 .invalidate_devices
215 .store(true, std::sync::atomic::Ordering::Release);
216 }
217 if let Some(mut callback) = self.state.callbacks.resize.take() {
218 callback(new_logical_size, scale_factor);
219 self.state.callbacks.resize.set(Some(callback));
220 }
221 }
222
223 fn handle_size_move_loop(&self, handle: HWND) -> Option<isize> {
224 unsafe {
225 let ret = SetTimer(
226 Some(handle),
227 SIZE_MOVE_LOOP_TIMER_ID,
228 USER_TIMER_MINIMUM,
229 None,
230 );
231 if ret == 0 {
232 log::error!(
233 "unable to create timer: {}",
234 std::io::Error::last_os_error()
235 );
236 }
237 }
238 None
239 }
240
241 fn handle_size_move_loop_exit(&self, handle: HWND) -> Option<isize> {
242 unsafe {
243 KillTimer(Some(handle), SIZE_MOVE_LOOP_TIMER_ID).log_err();
244 }
245 None
246 }
247
248 fn handle_timer_msg(&self, handle: HWND, wparam: WPARAM) -> Option<isize> {
249 if wparam.0 == SIZE_MOVE_LOOP_TIMER_ID {
250 let mut runnables = self.main_receiver.clone().try_iter();
251 while let Some(Ok(runnable)) = runnables.next() {
252 WindowsDispatcher::execute_runnable(runnable);
253 }
254 self.handle_paint_msg(handle)
255 } else {
256 None
257 }
258 }
259
260 fn handle_paint_msg(&self, handle: HWND) -> Option<isize> {
261 self.draw_window(handle, false)
262 }
263
264 fn handle_close_msg(&self) -> Option<isize> {
265 let mut callback = self.state.callbacks.should_close.take()?;
266 let should_close = callback();
267 self.state.callbacks.should_close.set(Some(callback));
268 if should_close { None } else { Some(0) }
269 }
270
271 fn handle_destroy_msg(&self, handle: HWND) -> Option<isize> {
272 let callback = { self.state.callbacks.close.take() };
273 // Re-enable parent window if this was a modal dialog
274 if let Some(parent_hwnd) = self.parent_hwnd {
275 unsafe {
276 let _ = EnableWindow(parent_hwnd, true);
277 let _ = SetForegroundWindow(parent_hwnd);
278 }
279 }
280
281 if let Some(callback) = callback {
282 callback();
283 }
284 unsafe {
285 PostMessageW(
286 Some(self.platform_window_handle),
287 WM_GPUI_CLOSE_ONE_WINDOW,
288 WPARAM(self.validation_number),
289 LPARAM(handle.0 as isize),
290 )
291 .log_err();
292 }
293 Some(0)
294 }
295
296 fn handle_mouse_move_msg(&self, handle: HWND, lparam: LPARAM, wparam: WPARAM) -> Option<isize> {
297 self.start_tracking_mouse(handle, TME_LEAVE);
298
299 let Some(mut func) = self.state.callbacks.input.take() else {
300 return Some(1);
301 };
302 let scale_factor = self.state.scale_factor.get();
303
304 let pressed_button = match MODIFIERKEYS_FLAGS(wparam.loword() as u32) {
305 flags if flags.contains(MK_LBUTTON) => Some(MouseButton::Left),
306 flags if flags.contains(MK_RBUTTON) => Some(MouseButton::Right),
307 flags if flags.contains(MK_MBUTTON) => Some(MouseButton::Middle),
308 flags if flags.contains(MK_XBUTTON1) => {
309 Some(MouseButton::Navigate(NavigationDirection::Back))
310 }
311 flags if flags.contains(MK_XBUTTON2) => {
312 Some(MouseButton::Navigate(NavigationDirection::Forward))
313 }
314 _ => None,
315 };
316 let x = lparam.signed_loword() as f32;
317 let y = lparam.signed_hiword() as f32;
318 let input = PlatformInput::MouseMove(MouseMoveEvent {
319 position: logical_point(x, y, scale_factor),
320 pressed_button,
321 modifiers: current_modifiers(),
322 });
323 let handled = !func(input).propagate;
324 self.state.callbacks.input.set(Some(func));
325
326 if handled { Some(0) } else { Some(1) }
327 }
328
329 fn handle_mouse_leave_msg(&self) -> Option<isize> {
330 self.state.hovered.set(false);
331 if let Some(mut callback) = self.state.callbacks.hovered_status_change.take() {
332 callback(false);
333 self.state
334 .callbacks
335 .hovered_status_change
336 .set(Some(callback));
337 }
338
339 Some(0)
340 }
341
342 fn handle_syskeyup_msg(&self, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
343 let input = handle_key_event(wparam, lparam, &self.state, |keystroke, _| {
344 PlatformInput::KeyUp(KeyUpEvent { keystroke })
345 })?;
346 let mut func = self.state.callbacks.input.take()?;
347
348 func(input);
349 self.state.callbacks.input.set(Some(func));
350
351 // Always return 0 to indicate that the message was handled, so we could properly handle `ModifiersChanged` event.
352 Some(0)
353 }
354
355 // It's a known bug that you can't trigger `ctrl-shift-0`. See:
356 // https://superuser.com/questions/1455762/ctrl-shift-number-key-combination-has-stopped-working-for-a-few-numbers
357 fn handle_keydown_msg(&self, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
358 let Some(input) = handle_key_event(
359 wparam,
360 lparam,
361 &self.state,
362 |keystroke, prefer_character_input| {
363 PlatformInput::KeyDown(KeyDownEvent {
364 keystroke,
365 is_held: lparam.0 & (0x1 << 30) > 0,
366 prefer_character_input,
367 })
368 },
369 ) else {
370 return Some(1);
371 };
372
373 let Some(mut func) = self.state.callbacks.input.take() else {
374 return Some(1);
375 };
376
377 let handled = !func(input).propagate;
378
379 self.state.callbacks.input.set(Some(func));
380
381 if handled { Some(0) } else { Some(1) }
382 }
383
384 fn handle_keyup_msg(&self, wparam: WPARAM, lparam: LPARAM) -> Option<isize> {
385 let Some(input) = handle_key_event(wparam, lparam, &self.state, |keystroke, _| {
386 PlatformInput::KeyUp(KeyUpEvent { keystroke })
387 }) else {
388 return Some(1);
389 };
390
391 let Some(mut func) = self.state.callbacks.input.take() else {
392 return Some(1);
393 };
394
395 let handled = !func(input).propagate;
396 self.state.callbacks.input.set(Some(func));
397
398 if handled { Some(0) } else { Some(1) }
399 }
400
401 fn handle_char_msg(&self, wparam: WPARAM) -> Option<isize> {
402 let input = self.parse_char_message(wparam)?;
403 self.with_input_handler(|input_handler| {
404 input_handler.replace_text_in_range(None, &input);
405 });
406
407 Some(0)
408 }
409
410 fn handle_mouse_down_msg(
411 &self,
412 handle: HWND,
413 button: MouseButton,
414 lparam: LPARAM,
415 ) -> Option<isize> {
416 unsafe { SetCapture(handle) };
417
418 let Some(mut func) = self.state.callbacks.input.take() else {
419 return Some(1);
420 };
421 let x = lparam.signed_loword();
422 let y = lparam.signed_hiword();
423 let physical_point = point(DevicePixels(x as i32), DevicePixels(y as i32));
424 let click_count = self.state.click_state.update(button, physical_point);
425 let scale_factor = self.state.scale_factor.get();
426
427 let input = PlatformInput::MouseDown(MouseDownEvent {
428 button,
429 position: logical_point(x as f32, y as f32, scale_factor),
430 modifiers: current_modifiers(),
431 click_count,
432 first_mouse: false,
433 });
434 let handled = !func(input).propagate;
435 self.state.callbacks.input.set(Some(func));
436
437 if handled { Some(0) } else { Some(1) }
438 }
439
440 fn handle_mouse_up_msg(
441 &self,
442 _handle: HWND,
443 button: MouseButton,
444 lparam: LPARAM,
445 ) -> Option<isize> {
446 unsafe { ReleaseCapture().log_err() };
447
448 let Some(mut func) = self.state.callbacks.input.take() else {
449 return Some(1);
450 };
451 let x = lparam.signed_loword() as f32;
452 let y = lparam.signed_hiword() as f32;
453 let click_count = self.state.click_state.current_count.get();
454 let scale_factor = self.state.scale_factor.get();
455
456 let input = PlatformInput::MouseUp(MouseUpEvent {
457 button,
458 position: logical_point(x, y, scale_factor),
459 modifiers: current_modifiers(),
460 click_count,
461 });
462 let handled = !func(input).propagate;
463 self.state.callbacks.input.set(Some(func));
464
465 if handled { Some(0) } else { Some(1) }
466 }
467
468 fn handle_xbutton_msg(
469 &self,
470 handle: HWND,
471 wparam: WPARAM,
472 lparam: LPARAM,
473 handler: impl Fn(&Self, HWND, MouseButton, LPARAM) -> Option<isize>,
474 ) -> Option<isize> {
475 let nav_dir = match wparam.hiword() {
476 XBUTTON1 => NavigationDirection::Back,
477 XBUTTON2 => NavigationDirection::Forward,
478 _ => return Some(1),
479 };
480 handler(self, handle, MouseButton::Navigate(nav_dir), lparam)
481 }
482
483 fn handle_mouse_wheel_msg(
484 &self,
485 handle: HWND,
486 wparam: WPARAM,
487 lparam: LPARAM,
488 ) -> Option<isize> {
489 let modifiers = current_modifiers();
490
491 let Some(mut func) = self.state.callbacks.input.take() else {
492 return Some(1);
493 };
494 let scale_factor = self.state.scale_factor.get();
495 let wheel_scroll_amount = match modifiers.shift {
496 true => self
497 .system_settings()
498 .mouse_wheel_settings
499 .wheel_scroll_chars
500 .get(),
501 false => self
502 .system_settings()
503 .mouse_wheel_settings
504 .wheel_scroll_lines
505 .get(),
506 };
507
508 let wheel_distance =
509 (wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_amount as f32;
510 let mut cursor_point = POINT {
511 x: lparam.signed_loword().into(),
512 y: lparam.signed_hiword().into(),
513 };
514 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
515 let input = PlatformInput::ScrollWheel(ScrollWheelEvent {
516 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
517 delta: ScrollDelta::Lines(match modifiers.shift {
518 true => Point {
519 x: wheel_distance,
520 y: 0.0,
521 },
522 false => Point {
523 y: wheel_distance,
524 x: 0.0,
525 },
526 }),
527 modifiers,
528 touch_phase: TouchPhase::Moved,
529 });
530 let handled = !func(input).propagate;
531 self.state.callbacks.input.set(Some(func));
532
533 if handled { Some(0) } else { Some(1) }
534 }
535
536 fn handle_mouse_horizontal_wheel_msg(
537 &self,
538 handle: HWND,
539 wparam: WPARAM,
540 lparam: LPARAM,
541 ) -> Option<isize> {
542 let Some(mut func) = self.state.callbacks.input.take() else {
543 return Some(1);
544 };
545 let scale_factor = self.state.scale_factor.get();
546 let wheel_scroll_chars = self
547 .system_settings()
548 .mouse_wheel_settings
549 .wheel_scroll_chars
550 .get();
551
552 let wheel_distance =
553 (-wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_chars as f32;
554 let mut cursor_point = POINT {
555 x: lparam.signed_loword().into(),
556 y: lparam.signed_hiword().into(),
557 };
558 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
559 let event = PlatformInput::ScrollWheel(ScrollWheelEvent {
560 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
561 delta: ScrollDelta::Lines(Point {
562 x: wheel_distance,
563 y: 0.0,
564 }),
565 modifiers: current_modifiers(),
566 touch_phase: TouchPhase::Moved,
567 });
568 let handled = !func(event).propagate;
569 self.state.callbacks.input.set(Some(func));
570
571 if handled { Some(0) } else { Some(1) }
572 }
573
574 fn retrieve_caret_position(&self) -> Option<POINT> {
575 self.with_input_handler_and_scale_factor(|input_handler, scale_factor| {
576 let caret_range = input_handler.selected_text_range(false)?;
577 let caret_position = input_handler.bounds_for_range(caret_range.range)?;
578 Some(POINT {
579 // logical to physical
580 x: (caret_position.origin.x.0 * scale_factor) as i32,
581 y: (caret_position.origin.y.0 * scale_factor) as i32
582 + ((caret_position.size.height.0 * scale_factor) as i32 / 2),
583 })
584 })
585 }
586
587 fn handle_ime_position(&self, handle: HWND) -> Option<isize> {
588 if let Some(caret_position) = self.retrieve_caret_position() {
589 self.update_ime_position(handle, caret_position);
590 }
591 Some(0)
592 }
593
594 pub(crate) fn update_ime_position(&self, handle: HWND, caret_position: POINT) {
595 unsafe {
596 let ctx = ImmGetContext(handle);
597 if ctx.is_invalid() {
598 return;
599 }
600
601 let config = COMPOSITIONFORM {
602 dwStyle: CFS_POINT,
603 ptCurrentPos: caret_position,
604 ..Default::default()
605 };
606 ImmSetCompositionWindow(ctx, &config).ok().log_err();
607 let config = CANDIDATEFORM {
608 dwStyle: CFS_CANDIDATEPOS,
609 ptCurrentPos: caret_position,
610 ..Default::default()
611 };
612 ImmSetCandidateWindow(ctx, &config).ok().log_err();
613 ImmReleaseContext(handle, ctx).ok().log_err();
614 }
615 }
616
617 fn handle_ime_composition(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
618 let ctx = unsafe { ImmGetContext(handle) };
619 let result = self.handle_ime_composition_inner(ctx, lparam);
620 unsafe { ImmReleaseContext(handle, ctx).ok().log_err() };
621 result
622 }
623
624 fn handle_ime_composition_inner(&self, ctx: HIMC, lparam: LPARAM) -> Option<isize> {
625 let lparam = lparam.0 as u32;
626 if lparam == 0 {
627 // Japanese IME may send this message with lparam = 0, which indicates that
628 // there is no composition string.
629 self.with_input_handler(|input_handler| {
630 input_handler.replace_text_in_range(None, "");
631 })?;
632 Some(0)
633 } else {
634 if lparam & GCS_RESULTSTR.0 > 0 {
635 let comp_result = parse_ime_composition_string(ctx, GCS_RESULTSTR)?;
636 self.with_input_handler(|input_handler| {
637 input_handler
638 .replace_text_in_range(None, &String::from_utf16_lossy(&comp_result));
639 })?;
640 }
641 if lparam & GCS_COMPSTR.0 > 0 {
642 let comp_string = parse_ime_composition_string(ctx, GCS_COMPSTR)?;
643 let caret_pos =
644 (!comp_string.is_empty() && lparam & GCS_CURSORPOS.0 > 0).then(|| {
645 let cursor_pos = retrieve_composition_cursor_position(ctx);
646 let pos = if should_use_ime_cursor_position(ctx, cursor_pos) {
647 cursor_pos
648 } else {
649 comp_string.len()
650 };
651 pos..pos
652 });
653 self.with_input_handler(|input_handler| {
654 input_handler.replace_and_mark_text_in_range(
655 None,
656 &String::from_utf16_lossy(&comp_string),
657 caret_pos,
658 );
659 })?;
660 }
661 if lparam & (GCS_RESULTSTR.0 | GCS_COMPSTR.0) > 0 {
662 return Some(0);
663 }
664
665 // currently, we don't care other stuff
666 None
667 }
668 }
669
670 fn handle_calc_client_size(
671 &self,
672 handle: HWND,
673 wparam: WPARAM,
674 lparam: LPARAM,
675 ) -> Option<isize> {
676 if !self.hide_title_bar || self.state.is_fullscreen() || wparam.0 == 0 {
677 return None;
678 }
679
680 unsafe {
681 let params = lparam.0 as *mut NCCALCSIZE_PARAMS;
682 let saved_top = (*params).rgrc[0].top;
683 let result = DefWindowProcW(handle, WM_NCCALCSIZE, wparam, lparam);
684 (*params).rgrc[0].top = saved_top;
685 if self.state.is_maximized() {
686 let dpi = GetDpiForWindow(handle);
687 (*params).rgrc[0].top += get_frame_thicknessx(dpi);
688 }
689 Some(result.0 as isize)
690 }
691 }
692
693 fn handle_activate_msg(self: &Rc<Self>, wparam: WPARAM) -> Option<isize> {
694 let activated = wparam.loword() > 0;
695 let this = self.clone();
696 self.executor
697 .spawn(async move {
698 if let Some(mut func) = this.state.callbacks.active_status_change.take() {
699 func(activated);
700 this.state.callbacks.active_status_change.set(Some(func));
701 }
702 })
703 .detach();
704
705 None
706 }
707
708 fn handle_create_msg(&self, handle: HWND) -> Option<isize> {
709 if self.hide_title_bar {
710 notify_frame_changed(handle);
711 Some(0)
712 } else {
713 None
714 }
715 }
716
717 fn handle_dpi_changed_msg(
718 &self,
719 handle: HWND,
720 wparam: WPARAM,
721 lparam: LPARAM,
722 ) -> Option<isize> {
723 let new_dpi = wparam.loword() as f32;
724
725 let is_maximized = self.state.is_maximized();
726 let new_scale_factor = new_dpi / USER_DEFAULT_SCREEN_DPI as f32;
727 self.state.scale_factor.set(new_scale_factor);
728 self.state.border_offset.update(handle).log_err();
729
730 if is_maximized {
731 // Get the monitor and its work area at the new DPI
732 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONEAREST) };
733 let mut monitor_info: MONITORINFO = unsafe { std::mem::zeroed() };
734 monitor_info.cbSize = std::mem::size_of::<MONITORINFO>() as u32;
735 if unsafe { GetMonitorInfoW(monitor, &mut monitor_info) }.as_bool() {
736 let work_area = monitor_info.rcWork;
737 let width = work_area.right - work_area.left;
738 let height = work_area.bottom - work_area.top;
739
740 // Update the window size to match the new monitor work area
741 // This will trigger WM_SIZE which will handle the size change
742 unsafe {
743 SetWindowPos(
744 handle,
745 None,
746 work_area.left,
747 work_area.top,
748 width,
749 height,
750 SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED,
751 )
752 .context("unable to set maximized window position after dpi has changed")
753 .log_err();
754 }
755
756 // SetWindowPos may not send WM_SIZE for maximized windows in some cases,
757 // so we manually update the size to ensure proper rendering
758 let device_size = size(DevicePixels(width), DevicePixels(height));
759 self.handle_size_change(device_size, new_scale_factor, true);
760 }
761 } else {
762 // For non-maximized windows, use the suggested RECT from the system
763 let rect = unsafe { &*(lparam.0 as *const RECT) };
764 let width = rect.right - rect.left;
765 let height = rect.bottom - rect.top;
766 // this will emit `WM_SIZE` and `WM_MOVE` right here
767 // even before this function returns
768 // the new size is handled in `WM_SIZE`
769 unsafe {
770 SetWindowPos(
771 handle,
772 None,
773 rect.left,
774 rect.top,
775 width,
776 height,
777 SWP_NOZORDER | SWP_NOACTIVATE,
778 )
779 .context("unable to set window position after dpi has changed")
780 .log_err();
781 }
782 }
783
784 Some(0)
785 }
786
787 fn handle_display_change_msg(&self, handle: HWND) -> Option<isize> {
788 let new_monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
789 if new_monitor.is_invalid() {
790 log::error!("No monitor detected!");
791 return None;
792 }
793 let new_display = WindowsDisplay::new_with_handle(new_monitor).log_err()?;
794 self.state.display.set(new_display);
795 Some(0)
796 }
797
798 fn handle_hit_test_msg(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
799 if !self.is_movable || self.state.is_fullscreen() {
800 return None;
801 }
802
803 let callback = self.state.callbacks.hit_test_window_control.take();
804 let drag_area = if let Some(mut callback) = callback {
805 let area = callback();
806 self.state
807 .callbacks
808 .hit_test_window_control
809 .set(Some(callback));
810 if let Some(area) = area {
811 match area {
812 WindowControlArea::Drag => Some(HTCAPTION as _),
813 WindowControlArea::Close => return Some(HTCLOSE as _),
814 WindowControlArea::Max => return Some(HTMAXBUTTON as _),
815 WindowControlArea::Min => return Some(HTMINBUTTON as _),
816 }
817 } else {
818 None
819 }
820 } else {
821 None
822 };
823
824 if !self.hide_title_bar {
825 // If the OS draws the title bar, we don't need to handle hit test messages.
826 return drag_area;
827 }
828
829 let dpi = unsafe { GetDpiForWindow(handle) };
830 // We do not use the OS title bar, so the default `DefWindowProcW` will only register a 1px edge for resizes
831 // We need to calculate the frame thickness ourselves and do the hit test manually.
832 let frame_y = get_frame_thicknessx(dpi);
833 let frame_x = get_frame_thicknessy(dpi);
834 let mut cursor_point = POINT {
835 x: lparam.signed_loword().into(),
836 y: lparam.signed_hiword().into(),
837 };
838
839 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
840 if !self.state.is_maximized() && 0 <= cursor_point.y && cursor_point.y <= frame_y {
841 // x-axis actually goes from -frame_x to 0
842 return Some(if cursor_point.x <= 0 {
843 HTTOPLEFT
844 } else {
845 let mut rect = Default::default();
846 unsafe { GetWindowRect(handle, &mut rect) }.log_err();
847 // right and bottom bounds of RECT are exclusive, thus `-1`
848 let right = rect.right - rect.left - 1;
849 // the bounds include the padding frames, so accomodate for both of them
850 if right - 2 * frame_x <= cursor_point.x {
851 HTTOPRIGHT
852 } else {
853 HTTOP
854 }
855 } as _);
856 }
857
858 drag_area
859 }
860
861 fn handle_nc_mouse_move_msg(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
862 self.start_tracking_mouse(handle, TME_LEAVE | TME_NONCLIENT);
863
864 let mut func = self.state.callbacks.input.take()?;
865 let scale_factor = self.state.scale_factor.get();
866
867 let mut cursor_point = POINT {
868 x: lparam.signed_loword().into(),
869 y: lparam.signed_hiword().into(),
870 };
871 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
872 let input = PlatformInput::MouseMove(MouseMoveEvent {
873 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
874 pressed_button: None,
875 modifiers: current_modifiers(),
876 });
877 let handled = !func(input).propagate;
878 self.state.callbacks.input.set(Some(func));
879
880 if handled { Some(0) } else { None }
881 }
882
883 fn handle_nc_mouse_down_msg(
884 &self,
885 handle: HWND,
886 button: MouseButton,
887 wparam: WPARAM,
888 lparam: LPARAM,
889 ) -> Option<isize> {
890 if let Some(mut func) = self.state.callbacks.input.take() {
891 let scale_factor = self.state.scale_factor.get();
892 let mut cursor_point = POINT {
893 x: lparam.signed_loword().into(),
894 y: lparam.signed_hiword().into(),
895 };
896 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
897 let physical_point = point(DevicePixels(cursor_point.x), DevicePixels(cursor_point.y));
898 let click_count = self.state.click_state.update(button, physical_point);
899
900 let input = PlatformInput::MouseDown(MouseDownEvent {
901 button,
902 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
903 modifiers: current_modifiers(),
904 click_count,
905 first_mouse: false,
906 });
907 let handled = !func(input).propagate;
908 self.state.callbacks.input.set(Some(func));
909
910 if handled {
911 return Some(0);
912 }
913 } else {
914 };
915
916 // Since these are handled in handle_nc_mouse_up_msg we must prevent the default window proc
917 if button == MouseButton::Left {
918 match wparam.0 as u32 {
919 HTMINBUTTON => self.state.nc_button_pressed.set(Some(HTMINBUTTON)),
920 HTMAXBUTTON => self.state.nc_button_pressed.set(Some(HTMAXBUTTON)),
921 HTCLOSE => self.state.nc_button_pressed.set(Some(HTCLOSE)),
922 _ => return None,
923 };
924 Some(0)
925 } else {
926 None
927 }
928 }
929
930 fn handle_nc_mouse_up_msg(
931 &self,
932 handle: HWND,
933 button: MouseButton,
934 wparam: WPARAM,
935 lparam: LPARAM,
936 ) -> Option<isize> {
937 if let Some(mut func) = self.state.callbacks.input.take() {
938 let scale_factor = self.state.scale_factor.get();
939
940 let mut cursor_point = POINT {
941 x: lparam.signed_loword().into(),
942 y: lparam.signed_hiword().into(),
943 };
944 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
945 let input = PlatformInput::MouseUp(MouseUpEvent {
946 button,
947 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
948 modifiers: current_modifiers(),
949 click_count: 1,
950 });
951 let handled = !func(input).propagate;
952 self.state.callbacks.input.set(Some(func));
953
954 if handled {
955 return Some(0);
956 }
957 } else {
958 }
959
960 let last_pressed = self.state.nc_button_pressed.take();
961 if button == MouseButton::Left
962 && let Some(last_pressed) = last_pressed
963 {
964 let handled = match (wparam.0 as u32, last_pressed) {
965 (HTMINBUTTON, HTMINBUTTON) => {
966 unsafe { ShowWindowAsync(handle, SW_MINIMIZE).ok().log_err() };
967 true
968 }
969 (HTMAXBUTTON, HTMAXBUTTON) => {
970 if self.state.is_maximized() {
971 unsafe { ShowWindowAsync(handle, SW_NORMAL).ok().log_err() };
972 } else {
973 unsafe { ShowWindowAsync(handle, SW_MAXIMIZE).ok().log_err() };
974 }
975 true
976 }
977 (HTCLOSE, HTCLOSE) => {
978 unsafe {
979 PostMessageW(Some(handle), WM_CLOSE, WPARAM::default(), LPARAM::default())
980 .log_err()
981 };
982 true
983 }
984 _ => false,
985 };
986 if handled {
987 return Some(0);
988 }
989 }
990
991 None
992 }
993
994 fn handle_cursor_changed(&self, lparam: LPARAM) -> Option<isize> {
995 let had_cursor = self.state.current_cursor.get().is_some();
996
997 self.state.current_cursor.set(if lparam.0 == 0 {
998 None
999 } else {
1000 Some(HCURSOR(lparam.0 as _))
1001 });
1002
1003 if had_cursor != self.state.current_cursor.get().is_some() {
1004 unsafe { SetCursor(self.state.current_cursor.get()) };
1005 }
1006
1007 Some(0)
1008 }
1009
1010 fn handle_set_cursor(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
1011 if unsafe { !IsWindowEnabled(handle).as_bool() }
1012 || matches!(
1013 lparam.loword() as u32,
1014 HTLEFT
1015 | HTRIGHT
1016 | HTTOP
1017 | HTTOPLEFT
1018 | HTTOPRIGHT
1019 | HTBOTTOM
1020 | HTBOTTOMLEFT
1021 | HTBOTTOMRIGHT
1022 )
1023 {
1024 return None;
1025 }
1026 unsafe {
1027 SetCursor(self.state.current_cursor.get());
1028 };
1029 Some(0)
1030 }
1031
1032 fn handle_system_settings_changed(
1033 &self,
1034 handle: HWND,
1035 wparam: WPARAM,
1036 lparam: LPARAM,
1037 ) -> Option<isize> {
1038 if wparam.0 != 0 {
1039 self.state.click_state.system_update(wparam.0);
1040 self.state.border_offset.update(handle).log_err();
1041 // system settings may emit a window message which wants to take the refcell self.state, so drop it
1042
1043 self.system_settings().update(wparam.0);
1044 } else {
1045 self.handle_system_theme_changed(handle, lparam)?;
1046 };
1047
1048 Some(0)
1049 }
1050
1051 fn handle_system_theme_changed(&self, handle: HWND, lparam: LPARAM) -> Option<isize> {
1052 // lParam is a pointer to a string that indicates the area containing the system parameter
1053 // that was changed.
1054 let parameter = PCWSTR::from_raw(lparam.0 as _);
1055 if unsafe { !parameter.is_null() && !parameter.is_empty() }
1056 && let Some(parameter_string) = unsafe { parameter.to_string() }.log_err()
1057 {
1058 log::info!("System settings changed: {}", parameter_string);
1059 if parameter_string.as_str() == "ImmersiveColorSet" {
1060 let new_appearance = system_appearance()
1061 .context("unable to get system appearance when handling ImmersiveColorSet")
1062 .log_err()?;
1063
1064 if new_appearance != self.state.appearance.get() {
1065 self.state.appearance.set(new_appearance);
1066 let mut callback = self.state.callbacks.appearance_changed.take()?;
1067
1068 callback();
1069 self.state.callbacks.appearance_changed.set(Some(callback));
1070 configure_dwm_dark_mode(handle, new_appearance);
1071 }
1072 }
1073 }
1074 Some(0)
1075 }
1076
1077 fn handle_input_language_changed(&self) -> Option<isize> {
1078 unsafe {
1079 PostMessageW(
1080 Some(self.platform_window_handle),
1081 WM_GPUI_KEYBOARD_LAYOUT_CHANGED,
1082 WPARAM(self.validation_number),
1083 LPARAM(0),
1084 )
1085 .log_err();
1086 }
1087 Some(0)
1088 }
1089
1090 fn handle_window_visibility_changed(&self, handle: HWND, wparam: WPARAM) -> Option<isize> {
1091 if wparam.0 == 1 {
1092 self.draw_window(handle, false);
1093 }
1094 None
1095 }
1096
1097 fn handle_device_lost(&self, lparam: LPARAM) -> Option<isize> {
1098 let devices = lparam.0 as *const DirectXDevices;
1099 let devices = unsafe { &*devices };
1100 if let Err(err) = self
1101 .state
1102 .renderer
1103 .borrow_mut()
1104 .handle_device_lost(&devices)
1105 {
1106 panic!("Device lost: {err}");
1107 }
1108 Some(0)
1109 }
1110
1111 #[inline]
1112 fn draw_window(&self, handle: HWND, force_render: bool) -> Option<isize> {
1113 let mut request_frame = self.state.callbacks.request_frame.take()?;
1114
1115 // we are instructing gpui to force render a frame, this will
1116 // re-populate all the gpu textures for us so we can resume drawing in
1117 // case we disabled drawing earlier due to a device loss
1118 self.state.renderer.borrow_mut().mark_drawable();
1119 request_frame(RequestFrameOptions {
1120 require_presentation: false,
1121 force_render,
1122 });
1123
1124 self.state.callbacks.request_frame.set(Some(request_frame));
1125 unsafe { ValidateRect(Some(handle), None).ok().log_err() };
1126
1127 Some(0)
1128 }
1129
1130 #[inline]
1131 fn parse_char_message(&self, wparam: WPARAM) -> Option<String> {
1132 let code_point = wparam.loword();
1133
1134 // https://www.unicode.org/versions/Unicode16.0.0/core-spec/chapter-3/#G2630
1135 match code_point {
1136 0xD800..=0xDBFF => {
1137 // High surrogate, wait for low surrogate
1138 self.state.pending_surrogate.set(Some(code_point));
1139 None
1140 }
1141 0xDC00..=0xDFFF => {
1142 if let Some(high_surrogate) = self.state.pending_surrogate.take() {
1143 // Low surrogate, combine with pending high surrogate
1144 String::from_utf16(&[high_surrogate, code_point]).ok()
1145 } else {
1146 // Invalid low surrogate without a preceding high surrogate
1147 log::warn!(
1148 "Received low surrogate without a preceding high surrogate: {code_point:x}"
1149 );
1150 None
1151 }
1152 }
1153 _ => {
1154 self.state.pending_surrogate.set(None);
1155 char::from_u32(code_point as u32)
1156 .filter(|c| !c.is_control())
1157 .map(|c| c.to_string())
1158 }
1159 }
1160 }
1161
1162 fn start_tracking_mouse(&self, handle: HWND, flags: TRACKMOUSEEVENT_FLAGS) {
1163 if !self.state.hovered.get() {
1164 self.state.hovered.set(true);
1165 unsafe {
1166 TrackMouseEvent(&mut TRACKMOUSEEVENT {
1167 cbSize: std::mem::size_of::<TRACKMOUSEEVENT>() as u32,
1168 dwFlags: flags,
1169 hwndTrack: handle,
1170 dwHoverTime: HOVER_DEFAULT,
1171 })
1172 .log_err()
1173 };
1174 if let Some(mut callback) = self.state.callbacks.hovered_status_change.take() {
1175 callback(true);
1176 self.state
1177 .callbacks
1178 .hovered_status_change
1179 .set(Some(callback));
1180 }
1181 }
1182 }
1183
1184 fn with_input_handler<F, R>(&self, f: F) -> Option<R>
1185 where
1186 F: FnOnce(&mut PlatformInputHandler) -> R,
1187 {
1188 let mut input_handler = self.state.input_handler.take()?;
1189 let result = f(&mut input_handler);
1190 self.state.input_handler.set(Some(input_handler));
1191 Some(result)
1192 }
1193
1194 fn with_input_handler_and_scale_factor<F, R>(&self, f: F) -> Option<R>
1195 where
1196 F: FnOnce(&mut PlatformInputHandler, f32) -> Option<R>,
1197 {
1198 let mut input_handler = self.state.input_handler.take()?;
1199 let scale_factor = self.state.scale_factor.get();
1200
1201 let result = f(&mut input_handler, scale_factor);
1202 self.state.input_handler.set(Some(input_handler));
1203 result
1204 }
1205}
1206
1207fn handle_key_event<F>(
1208 wparam: WPARAM,
1209 lparam: LPARAM,
1210 state: &WindowsWindowState,
1211 f: F,
1212) -> Option<PlatformInput>
1213where
1214 F: FnOnce(Keystroke, bool) -> PlatformInput,
1215{
1216 let virtual_key = VIRTUAL_KEY(wparam.loword());
1217 let modifiers = current_modifiers();
1218
1219 match virtual_key {
1220 VK_SHIFT | VK_CONTROL | VK_MENU | VK_LMENU | VK_RMENU | VK_LWIN | VK_RWIN => {
1221 if state
1222 .last_reported_modifiers
1223 .get()
1224 .is_some_and(|prev_modifiers| prev_modifiers == modifiers)
1225 {
1226 return None;
1227 }
1228 state.last_reported_modifiers.set(Some(modifiers));
1229 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1230 modifiers,
1231 capslock: current_capslock(),
1232 }))
1233 }
1234 VK_PACKET => None,
1235 VK_CAPITAL => {
1236 let capslock = current_capslock();
1237 if state
1238 .last_reported_capslock
1239 .get()
1240 .is_some_and(|prev_capslock| prev_capslock == capslock)
1241 {
1242 return None;
1243 }
1244 state.last_reported_capslock.set(Some(capslock));
1245 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1246 modifiers,
1247 capslock,
1248 }))
1249 }
1250 vkey => {
1251 let keystroke = parse_normal_key(vkey, lparam, modifiers)?;
1252 Some(f(keystroke.0, keystroke.1))
1253 }
1254 }
1255}
1256
1257fn parse_immutable(vkey: VIRTUAL_KEY) -> Option<String> {
1258 Some(
1259 match vkey {
1260 VK_SPACE => "space",
1261 VK_BACK => "backspace",
1262 VK_RETURN => "enter",
1263 VK_TAB => "tab",
1264 VK_UP => "up",
1265 VK_DOWN => "down",
1266 VK_RIGHT => "right",
1267 VK_LEFT => "left",
1268 VK_HOME => "home",
1269 VK_END => "end",
1270 VK_PRIOR => "pageup",
1271 VK_NEXT => "pagedown",
1272 VK_BROWSER_BACK => "back",
1273 VK_BROWSER_FORWARD => "forward",
1274 VK_ESCAPE => "escape",
1275 VK_INSERT => "insert",
1276 VK_DELETE => "delete",
1277 VK_APPS => "menu",
1278 VK_F1 => "f1",
1279 VK_F2 => "f2",
1280 VK_F3 => "f3",
1281 VK_F4 => "f4",
1282 VK_F5 => "f5",
1283 VK_F6 => "f6",
1284 VK_F7 => "f7",
1285 VK_F8 => "f8",
1286 VK_F9 => "f9",
1287 VK_F10 => "f10",
1288 VK_F11 => "f11",
1289 VK_F12 => "f12",
1290 VK_F13 => "f13",
1291 VK_F14 => "f14",
1292 VK_F15 => "f15",
1293 VK_F16 => "f16",
1294 VK_F17 => "f17",
1295 VK_F18 => "f18",
1296 VK_F19 => "f19",
1297 VK_F20 => "f20",
1298 VK_F21 => "f21",
1299 VK_F22 => "f22",
1300 VK_F23 => "f23",
1301 VK_F24 => "f24",
1302 _ => return None,
1303 }
1304 .to_string(),
1305 )
1306}
1307
1308fn parse_normal_key(
1309 vkey: VIRTUAL_KEY,
1310 lparam: LPARAM,
1311 mut modifiers: Modifiers,
1312) -> Option<(Keystroke, bool)> {
1313 let (key_char, prefer_character_input) = process_key(vkey, lparam.hiword());
1314
1315 let key = parse_immutable(vkey).or_else(|| {
1316 let scan_code = lparam.hiword() & 0xFF;
1317 get_keystroke_key(vkey, scan_code as u32, &mut modifiers)
1318 })?;
1319
1320 Some((
1321 Keystroke {
1322 modifiers,
1323 key,
1324 key_char,
1325 },
1326 prefer_character_input,
1327 ))
1328}
1329
1330fn process_key(vkey: VIRTUAL_KEY, scan_code: u16) -> (Option<String>, bool) {
1331 let mut keyboard_state = [0u8; 256];
1332 unsafe {
1333 if GetKeyboardState(&mut keyboard_state).is_err() {
1334 return (None, false);
1335 }
1336 }
1337
1338 let mut buffer_c = [0u16; 8];
1339 let result_c = unsafe {
1340 ToUnicode(
1341 vkey.0 as u32,
1342 scan_code as u32,
1343 Some(&keyboard_state),
1344 &mut buffer_c,
1345 0x4,
1346 )
1347 };
1348
1349 if result_c == 0 {
1350 return (None, false);
1351 }
1352
1353 let c = &buffer_c[..result_c.unsigned_abs() as usize];
1354 let key_char = String::from_utf16(c)
1355 .ok()
1356 .filter(|s| !s.is_empty() && !s.chars().next().unwrap().is_control());
1357
1358 if result_c < 0 {
1359 return (key_char, true);
1360 }
1361
1362 if key_char.is_none() {
1363 return (None, false);
1364 }
1365
1366 // Workaround for some bug that makes the compiler think keyboard_state is still zeroed out
1367 let keyboard_state = std::hint::black_box(keyboard_state);
1368 let ctrl_down = (keyboard_state[VK_CONTROL.0 as usize] & 0x80) != 0;
1369 let alt_down = (keyboard_state[VK_MENU.0 as usize] & 0x80) != 0;
1370 let win_down = (keyboard_state[VK_LWIN.0 as usize] & 0x80) != 0
1371 || (keyboard_state[VK_RWIN.0 as usize] & 0x80) != 0;
1372
1373 let has_modifiers = ctrl_down || alt_down || win_down;
1374 if !has_modifiers {
1375 return (key_char, false);
1376 }
1377
1378 let mut state_no_modifiers = keyboard_state;
1379 state_no_modifiers[VK_CONTROL.0 as usize] = 0;
1380 state_no_modifiers[VK_LCONTROL.0 as usize] = 0;
1381 state_no_modifiers[VK_RCONTROL.0 as usize] = 0;
1382 state_no_modifiers[VK_MENU.0 as usize] = 0;
1383 state_no_modifiers[VK_LMENU.0 as usize] = 0;
1384 state_no_modifiers[VK_RMENU.0 as usize] = 0;
1385 state_no_modifiers[VK_LWIN.0 as usize] = 0;
1386 state_no_modifiers[VK_RWIN.0 as usize] = 0;
1387
1388 let mut buffer_c_no_modifiers = [0u16; 8];
1389 let result_c_no_modifiers = unsafe {
1390 ToUnicode(
1391 vkey.0 as u32,
1392 scan_code as u32,
1393 Some(&state_no_modifiers),
1394 &mut buffer_c_no_modifiers,
1395 0x4,
1396 )
1397 };
1398
1399 let c_no_modifiers = &buffer_c_no_modifiers[..result_c_no_modifiers.unsigned_abs() as usize];
1400 (
1401 key_char,
1402 result_c != result_c_no_modifiers || c != c_no_modifiers,
1403 )
1404}
1405
1406fn parse_ime_composition_string(ctx: HIMC, comp_type: IME_COMPOSITION_STRING) -> Option<Vec<u16>> {
1407 unsafe {
1408 let string_len = ImmGetCompositionStringW(ctx, comp_type, None, 0);
1409 if string_len >= 0 {
1410 let mut buffer = vec![0u8; string_len as usize + 2];
1411 ImmGetCompositionStringW(
1412 ctx,
1413 comp_type,
1414 Some(buffer.as_mut_ptr() as _),
1415 string_len as _,
1416 );
1417 let wstring = std::slice::from_raw_parts::<u16>(
1418 buffer.as_mut_ptr().cast::<u16>(),
1419 string_len as usize / 2,
1420 );
1421 Some(wstring.to_vec())
1422 } else {
1423 None
1424 }
1425 }
1426}
1427
1428#[inline]
1429fn retrieve_composition_cursor_position(ctx: HIMC) -> usize {
1430 unsafe { ImmGetCompositionStringW(ctx, GCS_CURSORPOS, None, 0) as usize }
1431}
1432
1433fn should_use_ime_cursor_position(ctx: HIMC, cursor_pos: usize) -> bool {
1434 let attrs_size = unsafe { ImmGetCompositionStringW(ctx, GCS_COMPATTR, None, 0) } as usize;
1435 if attrs_size == 0 {
1436 return false;
1437 }
1438
1439 let mut attrs = vec![0u8; attrs_size];
1440 let result = unsafe {
1441 ImmGetCompositionStringW(
1442 ctx,
1443 GCS_COMPATTR,
1444 Some(attrs.as_mut_ptr() as *mut _),
1445 attrs_size as u32,
1446 )
1447 };
1448 if result <= 0 {
1449 return false;
1450 }
1451
1452 // Keep the cursor adjacent to the inserted text by only using the suggested position
1453 // if it's adjacent to unconverted text.
1454 let at_cursor_is_input = cursor_pos < attrs.len() && attrs[cursor_pos] == (ATTR_INPUT as u8);
1455 let before_cursor_is_input = cursor_pos > 0
1456 && (cursor_pos - 1) < attrs.len()
1457 && attrs[cursor_pos - 1] == (ATTR_INPUT as u8);
1458
1459 at_cursor_is_input || before_cursor_is_input
1460}
1461
1462#[inline]
1463fn is_virtual_key_pressed(vkey: VIRTUAL_KEY) -> bool {
1464 unsafe { GetKeyState(vkey.0 as i32) < 0 }
1465}
1466
1467#[inline]
1468pub(crate) fn current_modifiers() -> Modifiers {
1469 Modifiers {
1470 control: is_virtual_key_pressed(VK_CONTROL),
1471 alt: is_virtual_key_pressed(VK_MENU),
1472 shift: is_virtual_key_pressed(VK_SHIFT),
1473 platform: is_virtual_key_pressed(VK_LWIN) || is_virtual_key_pressed(VK_RWIN),
1474 function: false,
1475 }
1476}
1477
1478#[inline]
1479pub(crate) fn current_capslock() -> Capslock {
1480 let on = unsafe { GetKeyState(VK_CAPITAL.0 as i32) & 1 } > 0;
1481 Capslock { on }
1482}
1483
1484// there is some additional non-visible space when talking about window
1485// borders on Windows:
1486// - SM_CXSIZEFRAME: The resize handle.
1487// - SM_CXPADDEDBORDER: Additional border space that isn't part of the resize handle.
1488fn get_frame_thicknessx(dpi: u32) -> i32 {
1489 let resize_frame_thickness = unsafe { GetSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) };
1490 let padding_thickness = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
1491 resize_frame_thickness + padding_thickness
1492}
1493
1494fn get_frame_thicknessy(dpi: u32) -> i32 {
1495 let resize_frame_thickness = unsafe { GetSystemMetricsForDpi(SM_CYSIZEFRAME, dpi) };
1496 let padding_thickness = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
1497 resize_frame_thickness + padding_thickness
1498}
1499
1500fn notify_frame_changed(handle: HWND) {
1501 unsafe {
1502 SetWindowPos(
1503 handle,
1504 None,
1505 0,
1506 0,
1507 0,
1508 0,
1509 SWP_FRAMECHANGED
1510 | SWP_NOACTIVATE
1511 | SWP_NOCOPYBITS
1512 | SWP_NOMOVE
1513 | SWP_NOOWNERZORDER
1514 | SWP_NOREPOSITION
1515 | SWP_NOSENDCHANGING
1516 | SWP_NOSIZE
1517 | SWP_NOZORDER,
1518 )
1519 .log_err();
1520 }
1521}