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;
26
27const SIZE_MOVE_LOOP_TIMER_ID: usize = 1;
28const AUTO_HIDE_TASKBAR_THICKNESS_PX: i32 = 1;
29
30pub(crate) fn handle_msg(
31 handle: HWND,
32 msg: u32,
33 wparam: WPARAM,
34 lparam: LPARAM,
35 state_ptr: Rc<WindowsWindowStatePtr>,
36) -> LRESULT {
37 let handled = match msg {
38 WM_ACTIVATE => handle_activate_msg(handle, wparam, state_ptr),
39 WM_CREATE => handle_create_msg(handle, state_ptr),
40 WM_MOVE => handle_move_msg(handle, lparam, state_ptr),
41 WM_SIZE => handle_size_msg(wparam, lparam, state_ptr),
42 WM_GETMINMAXINFO => handle_get_min_max_info_msg(lparam, state_ptr),
43 WM_ENTERSIZEMOVE | WM_ENTERMENULOOP => handle_size_move_loop(handle),
44 WM_EXITSIZEMOVE | WM_EXITMENULOOP => handle_size_move_loop_exit(handle),
45 WM_TIMER => handle_timer_msg(handle, wparam, state_ptr),
46 WM_NCCALCSIZE => handle_calc_client_size(handle, wparam, lparam, state_ptr),
47 WM_DPICHANGED => handle_dpi_changed_msg(handle, wparam, lparam, state_ptr),
48 WM_DISPLAYCHANGE => handle_display_change_msg(handle, state_ptr),
49 WM_NCHITTEST => handle_hit_test_msg(handle, msg, wparam, lparam, state_ptr),
50 WM_PAINT => handle_paint_msg(handle, state_ptr),
51 WM_CLOSE => handle_close_msg(state_ptr),
52 WM_DESTROY => handle_destroy_msg(handle, state_ptr),
53 WM_MOUSEMOVE => handle_mouse_move_msg(handle, lparam, wparam, state_ptr),
54 WM_MOUSELEAVE | WM_NCMOUSELEAVE => handle_mouse_leave_msg(state_ptr),
55 WM_NCMOUSEMOVE => handle_nc_mouse_move_msg(handle, lparam, state_ptr),
56 WM_NCLBUTTONDOWN => {
57 handle_nc_mouse_down_msg(handle, MouseButton::Left, wparam, lparam, state_ptr)
58 }
59 WM_NCRBUTTONDOWN => {
60 handle_nc_mouse_down_msg(handle, MouseButton::Right, wparam, lparam, state_ptr)
61 }
62 WM_NCMBUTTONDOWN => {
63 handle_nc_mouse_down_msg(handle, MouseButton::Middle, wparam, lparam, state_ptr)
64 }
65 WM_NCLBUTTONUP => {
66 handle_nc_mouse_up_msg(handle, MouseButton::Left, wparam, lparam, state_ptr)
67 }
68 WM_NCRBUTTONUP => {
69 handle_nc_mouse_up_msg(handle, MouseButton::Right, wparam, lparam, state_ptr)
70 }
71 WM_NCMBUTTONUP => {
72 handle_nc_mouse_up_msg(handle, MouseButton::Middle, wparam, lparam, state_ptr)
73 }
74 WM_LBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Left, lparam, state_ptr),
75 WM_RBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Right, lparam, state_ptr),
76 WM_MBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Middle, lparam, state_ptr),
77 WM_XBUTTONDOWN => {
78 handle_xbutton_msg(handle, wparam, lparam, handle_mouse_down_msg, state_ptr)
79 }
80 WM_LBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Left, lparam, state_ptr),
81 WM_RBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Right, lparam, state_ptr),
82 WM_MBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Middle, lparam, state_ptr),
83 WM_XBUTTONUP => handle_xbutton_msg(handle, wparam, lparam, handle_mouse_up_msg, state_ptr),
84 WM_MOUSEWHEEL => handle_mouse_wheel_msg(handle, wparam, lparam, state_ptr),
85 WM_MOUSEHWHEEL => handle_mouse_horizontal_wheel_msg(handle, wparam, lparam, state_ptr),
86 WM_SYSKEYDOWN => handle_syskeydown_msg(wparam, lparam, state_ptr),
87 WM_SYSKEYUP => handle_syskeyup_msg(wparam, lparam, state_ptr),
88 WM_SYSCOMMAND => handle_system_command(wparam, state_ptr),
89 WM_KEYDOWN => handle_keydown_msg(wparam, lparam, state_ptr),
90 WM_KEYUP => handle_keyup_msg(wparam, lparam, state_ptr),
91 WM_CHAR => handle_char_msg(wparam, state_ptr),
92 WM_DEADCHAR => handle_dead_char_msg(wparam, state_ptr),
93 WM_IME_STARTCOMPOSITION => handle_ime_position(handle, state_ptr),
94 WM_IME_COMPOSITION => handle_ime_composition(handle, lparam, state_ptr),
95 WM_SETCURSOR => handle_set_cursor(lparam, state_ptr),
96 WM_SETTINGCHANGE => handle_system_settings_changed(handle, lparam, state_ptr),
97 WM_INPUTLANGCHANGE => handle_input_language_changed(lparam, state_ptr),
98 WM_GPUI_CURSOR_STYLE_CHANGED => handle_cursor_changed(lparam, state_ptr),
99 _ => None,
100 };
101 if let Some(n) = handled {
102 LRESULT(n)
103 } else {
104 unsafe { DefWindowProcW(handle, msg, wparam, lparam) }
105 }
106}
107
108fn handle_move_msg(
109 handle: HWND,
110 lparam: LPARAM,
111 state_ptr: Rc<WindowsWindowStatePtr>,
112) -> Option<isize> {
113 let mut lock = state_ptr.state.borrow_mut();
114 let origin = logical_point(
115 lparam.signed_loword() as f32,
116 lparam.signed_hiword() as f32,
117 lock.scale_factor,
118 );
119 lock.origin = origin;
120 let size = lock.logical_size;
121 let center_x = origin.x.0 + size.width.0 / 2.;
122 let center_y = origin.y.0 + size.height.0 / 2.;
123 let monitor_bounds = lock.display.bounds();
124 if center_x < monitor_bounds.left().0
125 || center_x > monitor_bounds.right().0
126 || center_y < monitor_bounds.top().0
127 || center_y > monitor_bounds.bottom().0
128 {
129 // center of the window may have moved to another monitor
130 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
131 // minimize the window can trigger this event too, in this case,
132 // monitor is invalid, we do nothing.
133 if !monitor.is_invalid() && lock.display.handle != monitor {
134 // we will get the same monitor if we only have one
135 lock.display = WindowsDisplay::new_with_handle(monitor);
136 }
137 }
138 if let Some(mut callback) = lock.callbacks.moved.take() {
139 drop(lock);
140 callback();
141 state_ptr.state.borrow_mut().callbacks.moved = Some(callback);
142 }
143 Some(0)
144}
145
146fn handle_get_min_max_info_msg(
147 lparam: LPARAM,
148 state_ptr: Rc<WindowsWindowStatePtr>,
149) -> Option<isize> {
150 let lock = state_ptr.state.borrow();
151 if let Some(min_size) = lock.min_size {
152 let scale_factor = lock.scale_factor;
153 let boarder_offset = lock.border_offset;
154 drop(lock);
155
156 unsafe {
157 let minmax_info = &mut *(lparam.0 as *mut MINMAXINFO);
158 minmax_info.ptMinTrackSize.x =
159 min_size.width.scale(scale_factor).0 as i32 + boarder_offset.width_offset;
160 minmax_info.ptMinTrackSize.y =
161 min_size.height.scale(scale_factor).0 as i32 + boarder_offset.height_offset;
162 }
163 Some(0)
164 } else {
165 None
166 }
167}
168
169fn handle_size_msg(
170 wparam: WPARAM,
171 lparam: LPARAM,
172 state_ptr: Rc<WindowsWindowStatePtr>,
173) -> Option<isize> {
174 let mut lock = state_ptr.state.borrow_mut();
175
176 // Don't resize the renderer when the window is minimized, but record that it was minimized so
177 // that on restore the swap chain can be recreated via `update_drawable_size_even_if_unchanged`.
178 if wparam.0 == SIZE_MINIMIZED as usize {
179 lock.restore_from_minimized = lock.callbacks.request_frame.take();
180 return Some(0);
181 }
182
183 let width = lparam.loword().max(1) as i32;
184 let height = lparam.hiword().max(1) as i32;
185 let new_size = size(DevicePixels(width), DevicePixels(height));
186 let scale_factor = lock.scale_factor;
187 if lock.restore_from_minimized.is_some() {
188 lock.renderer
189 .update_drawable_size_even_if_unchanged(new_size);
190 lock.callbacks.request_frame = lock.restore_from_minimized.take();
191 } else {
192 lock.renderer.update_drawable_size(new_size);
193 }
194 let new_size = new_size.to_pixels(scale_factor);
195 lock.logical_size = new_size;
196 if let Some(mut callback) = lock.callbacks.resize.take() {
197 drop(lock);
198 callback(new_size, scale_factor);
199 state_ptr.state.borrow_mut().callbacks.resize = Some(callback);
200 }
201 Some(0)
202}
203
204fn handle_size_move_loop(handle: HWND) -> Option<isize> {
205 unsafe {
206 let ret = SetTimer(
207 Some(handle),
208 SIZE_MOVE_LOOP_TIMER_ID,
209 USER_TIMER_MINIMUM,
210 None,
211 );
212 if ret == 0 {
213 log::error!(
214 "unable to create timer: {}",
215 std::io::Error::last_os_error()
216 );
217 }
218 }
219 None
220}
221
222fn handle_size_move_loop_exit(handle: HWND) -> Option<isize> {
223 unsafe {
224 KillTimer(Some(handle), SIZE_MOVE_LOOP_TIMER_ID).log_err();
225 }
226 None
227}
228
229fn handle_timer_msg(
230 handle: HWND,
231 wparam: WPARAM,
232 state_ptr: Rc<WindowsWindowStatePtr>,
233) -> Option<isize> {
234 if wparam.0 == SIZE_MOVE_LOOP_TIMER_ID {
235 for runnable in state_ptr.main_receiver.drain() {
236 runnable.run();
237 }
238 handle_paint_msg(handle, state_ptr)
239 } else {
240 None
241 }
242}
243
244fn handle_paint_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
245 let mut lock = state_ptr.state.borrow_mut();
246 if let Some(mut request_frame) = lock.callbacks.request_frame.take() {
247 drop(lock);
248 request_frame(Default::default());
249 state_ptr.state.borrow_mut().callbacks.request_frame = Some(request_frame);
250 }
251 unsafe { ValidateRect(Some(handle), None).ok().log_err() };
252 Some(0)
253}
254
255fn handle_close_msg(state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
256 let mut lock = state_ptr.state.borrow_mut();
257 if let Some(mut callback) = lock.callbacks.should_close.take() {
258 drop(lock);
259 let should_close = callback();
260 state_ptr.state.borrow_mut().callbacks.should_close = Some(callback);
261 if should_close { None } else { Some(0) }
262 } else {
263 None
264 }
265}
266
267fn handle_destroy_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
268 let callback = {
269 let mut lock = state_ptr.state.borrow_mut();
270 lock.callbacks.close.take()
271 };
272 if let Some(callback) = callback {
273 callback();
274 }
275 unsafe {
276 PostThreadMessageW(
277 state_ptr.main_thread_id_win32,
278 WM_GPUI_CLOSE_ONE_WINDOW,
279 WPARAM(state_ptr.validation_number),
280 LPARAM(handle.0 as isize),
281 )
282 .log_err();
283 }
284 Some(0)
285}
286
287fn handle_mouse_move_msg(
288 handle: HWND,
289 lparam: LPARAM,
290 wparam: WPARAM,
291 state_ptr: Rc<WindowsWindowStatePtr>,
292) -> Option<isize> {
293 start_tracking_mouse(handle, &state_ptr, TME_LEAVE);
294
295 let mut lock = state_ptr.state.borrow_mut();
296 if let Some(mut callback) = lock.callbacks.input.take() {
297 let scale_factor = lock.scale_factor;
298 drop(lock);
299 let pressed_button = match MODIFIERKEYS_FLAGS(wparam.loword() as u32) {
300 flags if flags.contains(MK_LBUTTON) => Some(MouseButton::Left),
301 flags if flags.contains(MK_RBUTTON) => Some(MouseButton::Right),
302 flags if flags.contains(MK_MBUTTON) => Some(MouseButton::Middle),
303 flags if flags.contains(MK_XBUTTON1) => {
304 Some(MouseButton::Navigate(NavigationDirection::Back))
305 }
306 flags if flags.contains(MK_XBUTTON2) => {
307 Some(MouseButton::Navigate(NavigationDirection::Forward))
308 }
309 _ => None,
310 };
311 let x = lparam.signed_loword() as f32;
312 let y = lparam.signed_hiword() as f32;
313 let event = MouseMoveEvent {
314 position: logical_point(x, y, scale_factor),
315 pressed_button,
316 modifiers: current_modifiers(),
317 };
318 let result = if callback(PlatformInput::MouseMove(event)).default_prevented {
319 Some(0)
320 } else {
321 Some(1)
322 };
323 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
324 return result;
325 }
326 Some(1)
327}
328
329fn handle_mouse_leave_msg(state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
330 let mut lock = state_ptr.state.borrow_mut();
331 lock.hovered = false;
332 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
333 drop(lock);
334 callback(false);
335 state_ptr.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
336 }
337
338 Some(0)
339}
340
341fn handle_syskeydown_msg(
342 wparam: WPARAM,
343 lparam: LPARAM,
344 state_ptr: Rc<WindowsWindowStatePtr>,
345) -> Option<isize> {
346 let mut lock = state_ptr.state.borrow_mut();
347 let input = handle_key_event(wparam, lparam, &mut lock, |keystroke| {
348 PlatformInput::KeyDown(KeyDownEvent {
349 keystroke,
350 is_held: lparam.0 & (0x1 << 30) > 0,
351 })
352 })?;
353 let mut func = lock.callbacks.input.take()?;
354 drop(lock);
355
356 let handled = !func(input).propagate;
357
358 let mut lock = state_ptr.state.borrow_mut();
359 lock.callbacks.input = Some(func);
360
361 if handled {
362 lock.system_key_handled = true;
363 lock.suppress_next_char_msg = true;
364 Some(0)
365 } else {
366 // we need to call `DefWindowProcW`, or we will lose the system-wide `Alt+F4`, `Alt+{other keys}`
367 // shortcuts.
368 None
369 }
370}
371
372fn handle_syskeyup_msg(
373 wparam: WPARAM,
374 lparam: LPARAM,
375 state_ptr: Rc<WindowsWindowStatePtr>,
376) -> Option<isize> {
377 let mut lock = state_ptr.state.borrow_mut();
378 let input = handle_key_event(wparam, lparam, &mut lock, |keystroke| {
379 PlatformInput::KeyUp(KeyUpEvent { keystroke })
380 })?;
381 let mut func = lock.callbacks.input.take()?;
382 drop(lock);
383 func(input);
384 state_ptr.state.borrow_mut().callbacks.input = Some(func);
385
386 // Always return 0 to indicate that the message was handled, so we could properly handle `ModifiersChanged` event.
387 Some(0)
388}
389
390// It's a known bug that you can't trigger `ctrl-shift-0`. See:
391// https://superuser.com/questions/1455762/ctrl-shift-number-key-combination-has-stopped-working-for-a-few-numbers
392fn handle_keydown_msg(
393 wparam: WPARAM,
394 lparam: LPARAM,
395 state_ptr: Rc<WindowsWindowStatePtr>,
396) -> Option<isize> {
397 let mut lock = state_ptr.state.borrow_mut();
398 let Some(input) = handle_key_event(wparam, lparam, &mut lock, |keystroke| {
399 PlatformInput::KeyDown(KeyDownEvent {
400 keystroke,
401 is_held: lparam.0 & (0x1 << 30) > 0,
402 })
403 }) else {
404 return Some(1);
405 };
406
407 let Some(mut func) = lock.callbacks.input.take() else {
408 return Some(1);
409 };
410 drop(lock);
411
412 let handled = !func(input).propagate;
413
414 let mut lock = state_ptr.state.borrow_mut();
415 lock.callbacks.input = Some(func);
416
417 if handled {
418 lock.suppress_next_char_msg = true;
419 Some(0)
420 } else {
421 Some(1)
422 }
423}
424
425fn handle_keyup_msg(
426 wparam: WPARAM,
427 lparam: LPARAM,
428 state_ptr: Rc<WindowsWindowStatePtr>,
429) -> Option<isize> {
430 let mut lock = state_ptr.state.borrow_mut();
431 let Some(input) = handle_key_event(wparam, lparam, &mut lock, |keystroke| {
432 PlatformInput::KeyUp(KeyUpEvent { keystroke })
433 }) else {
434 return Some(1);
435 };
436
437 let Some(mut func) = lock.callbacks.input.take() else {
438 return Some(1);
439 };
440 drop(lock);
441
442 let result = if func(input).default_prevented {
443 Some(0)
444 } else {
445 Some(1)
446 };
447 state_ptr.state.borrow_mut().callbacks.input = Some(func);
448
449 result
450}
451
452fn handle_char_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
453 let Some(input) = char::from_u32(wparam.0 as u32)
454 .filter(|c| !c.is_control())
455 .map(String::from)
456 else {
457 return Some(1);
458 };
459 with_input_handler(&state_ptr, |input_handler| {
460 input_handler.replace_text_in_range(None, &input);
461 });
462
463 Some(0)
464}
465
466fn handle_dead_char_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
467 let ch = char::from_u32(wparam.0 as u32)?.to_string();
468 with_input_handler(&state_ptr, |input_handler| {
469 input_handler.replace_and_mark_text_in_range(None, &ch, None);
470 });
471 None
472}
473
474fn handle_mouse_down_msg(
475 handle: HWND,
476 button: MouseButton,
477 lparam: LPARAM,
478 state_ptr: Rc<WindowsWindowStatePtr>,
479) -> Option<isize> {
480 unsafe { SetCapture(handle) };
481 let mut lock = state_ptr.state.borrow_mut();
482 if let Some(mut callback) = lock.callbacks.input.take() {
483 let x = lparam.signed_loword() as f32;
484 let y = lparam.signed_hiword() as f32;
485 let physical_point = point(DevicePixels(x as i32), DevicePixels(y as i32));
486 let click_count = lock.click_state.update(button, physical_point);
487 let scale_factor = lock.scale_factor;
488 drop(lock);
489
490 let event = MouseDownEvent {
491 button,
492 position: logical_point(x, y, scale_factor),
493 modifiers: current_modifiers(),
494 click_count,
495 first_mouse: false,
496 };
497 let result = if callback(PlatformInput::MouseDown(event)).default_prevented {
498 Some(0)
499 } else {
500 Some(1)
501 };
502 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
503
504 result
505 } else {
506 Some(1)
507 }
508}
509
510fn handle_mouse_up_msg(
511 _handle: HWND,
512 button: MouseButton,
513 lparam: LPARAM,
514 state_ptr: Rc<WindowsWindowStatePtr>,
515) -> Option<isize> {
516 unsafe { ReleaseCapture().log_err() };
517 let mut lock = state_ptr.state.borrow_mut();
518 if let Some(mut callback) = lock.callbacks.input.take() {
519 let x = lparam.signed_loword() as f32;
520 let y = lparam.signed_hiword() as f32;
521 let click_count = lock.click_state.current_count;
522 let scale_factor = lock.scale_factor;
523 drop(lock);
524
525 let event = MouseUpEvent {
526 button,
527 position: logical_point(x, y, scale_factor),
528 modifiers: current_modifiers(),
529 click_count,
530 };
531 let result = if callback(PlatformInput::MouseUp(event)).default_prevented {
532 Some(0)
533 } else {
534 Some(1)
535 };
536 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
537
538 result
539 } else {
540 Some(1)
541 }
542}
543
544fn handle_xbutton_msg(
545 handle: HWND,
546 wparam: WPARAM,
547 lparam: LPARAM,
548 handler: impl Fn(HWND, MouseButton, LPARAM, Rc<WindowsWindowStatePtr>) -> Option<isize>,
549 state_ptr: Rc<WindowsWindowStatePtr>,
550) -> Option<isize> {
551 let nav_dir = match wparam.hiword() {
552 XBUTTON1 => NavigationDirection::Back,
553 XBUTTON2 => NavigationDirection::Forward,
554 _ => return Some(1),
555 };
556 handler(handle, MouseButton::Navigate(nav_dir), lparam, state_ptr)
557}
558
559fn handle_mouse_wheel_msg(
560 handle: HWND,
561 wparam: WPARAM,
562 lparam: LPARAM,
563 state_ptr: Rc<WindowsWindowStatePtr>,
564) -> Option<isize> {
565 let modifiers = current_modifiers();
566 let mut lock = state_ptr.state.borrow_mut();
567 if let Some(mut callback) = lock.callbacks.input.take() {
568 let scale_factor = lock.scale_factor;
569 let wheel_scroll_amount = match modifiers.shift {
570 true => lock.system_settings.mouse_wheel_settings.wheel_scroll_chars,
571 false => lock.system_settings.mouse_wheel_settings.wheel_scroll_lines,
572 };
573 drop(lock);
574 let wheel_distance =
575 (wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_amount as f32;
576 let mut cursor_point = POINT {
577 x: lparam.signed_loword().into(),
578 y: lparam.signed_hiword().into(),
579 };
580 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
581 let event = ScrollWheelEvent {
582 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
583 delta: ScrollDelta::Lines(match modifiers.shift {
584 true => Point {
585 x: wheel_distance,
586 y: 0.0,
587 },
588 false => Point {
589 y: wheel_distance,
590 x: 0.0,
591 },
592 }),
593 modifiers: current_modifiers(),
594 touch_phase: TouchPhase::Moved,
595 };
596 let result = if callback(PlatformInput::ScrollWheel(event)).default_prevented {
597 Some(0)
598 } else {
599 Some(1)
600 };
601 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
602
603 result
604 } else {
605 Some(1)
606 }
607}
608
609fn handle_mouse_horizontal_wheel_msg(
610 handle: HWND,
611 wparam: WPARAM,
612 lparam: LPARAM,
613 state_ptr: Rc<WindowsWindowStatePtr>,
614) -> Option<isize> {
615 let mut lock = state_ptr.state.borrow_mut();
616 if let Some(mut callback) = lock.callbacks.input.take() {
617 let scale_factor = lock.scale_factor;
618 let wheel_scroll_chars = lock.system_settings.mouse_wheel_settings.wheel_scroll_chars;
619 drop(lock);
620 let wheel_distance =
621 (-wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_chars as f32;
622 let mut cursor_point = POINT {
623 x: lparam.signed_loword().into(),
624 y: lparam.signed_hiword().into(),
625 };
626 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
627 let event = ScrollWheelEvent {
628 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
629 delta: ScrollDelta::Lines(Point {
630 x: wheel_distance,
631 y: 0.0,
632 }),
633 modifiers: current_modifiers(),
634 touch_phase: TouchPhase::Moved,
635 };
636 let result = if callback(PlatformInput::ScrollWheel(event)).default_prevented {
637 Some(0)
638 } else {
639 Some(1)
640 };
641 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
642
643 result
644 } else {
645 Some(1)
646 }
647}
648
649fn retrieve_caret_position(state_ptr: &Rc<WindowsWindowStatePtr>) -> Option<POINT> {
650 with_input_handler_and_scale_factor(state_ptr, |input_handler, scale_factor| {
651 let caret_range = input_handler.selected_text_range(false)?;
652 let caret_position = input_handler.bounds_for_range(caret_range.range)?;
653 Some(POINT {
654 // logical to physical
655 x: (caret_position.origin.x.0 * scale_factor) as i32,
656 y: (caret_position.origin.y.0 * scale_factor) as i32
657 + ((caret_position.size.height.0 * scale_factor) as i32 / 2),
658 })
659 })
660}
661
662fn handle_ime_position(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
663 unsafe {
664 let ctx = ImmGetContext(handle);
665
666 let Some(caret_position) = retrieve_caret_position(&state_ptr) else {
667 return Some(0);
668 };
669 {
670 let config = COMPOSITIONFORM {
671 dwStyle: CFS_POINT,
672 ptCurrentPos: caret_position,
673 ..Default::default()
674 };
675 ImmSetCompositionWindow(ctx, &config as _).ok().log_err();
676 }
677 {
678 let config = CANDIDATEFORM {
679 dwStyle: CFS_CANDIDATEPOS,
680 ptCurrentPos: caret_position,
681 ..Default::default()
682 };
683 ImmSetCandidateWindow(ctx, &config as _).ok().log_err();
684 }
685 ImmReleaseContext(handle, ctx).ok().log_err();
686 Some(0)
687 }
688}
689
690fn handle_ime_composition(
691 handle: HWND,
692 lparam: LPARAM,
693 state_ptr: Rc<WindowsWindowStatePtr>,
694) -> Option<isize> {
695 let ctx = unsafe { ImmGetContext(handle) };
696 let result = handle_ime_composition_inner(ctx, lparam, state_ptr);
697 unsafe { ImmReleaseContext(handle, ctx).ok().log_err() };
698 result
699}
700
701fn handle_ime_composition_inner(
702 ctx: HIMC,
703 lparam: LPARAM,
704 state_ptr: Rc<WindowsWindowStatePtr>,
705) -> Option<isize> {
706 let mut ime_input = None;
707 if lparam.0 as u32 & GCS_COMPSTR.0 > 0 {
708 let comp_string = parse_ime_compostion_string(ctx)?;
709 with_input_handler(&state_ptr, |input_handler| {
710 input_handler.replace_and_mark_text_in_range(None, &comp_string, None);
711 })?;
712 ime_input = Some(comp_string);
713 }
714 if lparam.0 as u32 & GCS_CURSORPOS.0 > 0 {
715 let comp_string = &ime_input?;
716 let caret_pos = retrieve_composition_cursor_position(ctx);
717 with_input_handler(&state_ptr, |input_handler| {
718 input_handler.replace_and_mark_text_in_range(
719 None,
720 comp_string,
721 Some(caret_pos..caret_pos),
722 );
723 })?;
724 }
725 if lparam.0 as u32 & GCS_RESULTSTR.0 > 0 {
726 let comp_result = parse_ime_compostion_result(ctx)?;
727 with_input_handler(&state_ptr, |input_handler| {
728 input_handler.replace_text_in_range(None, &comp_result);
729 })?;
730 return Some(0);
731 }
732 // currently, we don't care other stuff
733 None
734}
735
736/// SEE: https://learn.microsoft.com/en-us/windows/win32/winmsg/wm-nccalcsize
737fn handle_calc_client_size(
738 handle: HWND,
739 wparam: WPARAM,
740 lparam: LPARAM,
741 state_ptr: Rc<WindowsWindowStatePtr>,
742) -> Option<isize> {
743 if !state_ptr.hide_title_bar || state_ptr.state.borrow().is_fullscreen() || wparam.0 == 0 {
744 return None;
745 }
746
747 let is_maximized = state_ptr.state.borrow().is_maximized();
748 let insets = get_client_area_insets(handle, is_maximized, state_ptr.windows_version);
749 // wparam is TRUE so lparam points to an NCCALCSIZE_PARAMS structure
750 let mut params = lparam.0 as *mut NCCALCSIZE_PARAMS;
751 let mut requested_client_rect = unsafe { &mut ((*params).rgrc) };
752
753 requested_client_rect[0].left += insets.left;
754 requested_client_rect[0].top += insets.top;
755 requested_client_rect[0].right -= insets.right;
756 requested_client_rect[0].bottom -= insets.bottom;
757
758 // Fix auto hide taskbar not showing. This solution is based on the approach
759 // used by Chrome. However, it may result in one row of pixels being obscured
760 // in our client area. But as Chrome says, "there seems to be no better solution."
761 if is_maximized {
762 if let Some(ref taskbar_position) = state_ptr
763 .state
764 .borrow()
765 .system_settings
766 .auto_hide_taskbar_position
767 {
768 // Fot the auto-hide taskbar, adjust in by 1 pixel on taskbar edge,
769 // so the window isn't treated as a "fullscreen app", which would cause
770 // the taskbar to disappear.
771 match taskbar_position {
772 AutoHideTaskbarPosition::Left => {
773 requested_client_rect[0].left += AUTO_HIDE_TASKBAR_THICKNESS_PX
774 }
775 AutoHideTaskbarPosition::Top => {
776 requested_client_rect[0].top += AUTO_HIDE_TASKBAR_THICKNESS_PX
777 }
778 AutoHideTaskbarPosition::Right => {
779 requested_client_rect[0].right -= AUTO_HIDE_TASKBAR_THICKNESS_PX
780 }
781 AutoHideTaskbarPosition::Bottom => {
782 requested_client_rect[0].bottom -= AUTO_HIDE_TASKBAR_THICKNESS_PX
783 }
784 }
785 }
786 }
787
788 Some(0)
789}
790
791fn handle_activate_msg(
792 handle: HWND,
793 wparam: WPARAM,
794 state_ptr: Rc<WindowsWindowStatePtr>,
795) -> Option<isize> {
796 let activated = wparam.loword() > 0;
797 if state_ptr.hide_title_bar {
798 if let Some(titlebar_rect) = state_ptr.state.borrow().get_titlebar_rect().log_err() {
799 unsafe {
800 InvalidateRect(Some(handle), Some(&titlebar_rect), false)
801 .ok()
802 .log_err()
803 };
804 }
805 }
806 let this = state_ptr.clone();
807 state_ptr
808 .executor
809 .spawn(async move {
810 let mut lock = this.state.borrow_mut();
811 if let Some(mut cb) = lock.callbacks.active_status_change.take() {
812 drop(lock);
813 cb(activated);
814 this.state.borrow_mut().callbacks.active_status_change = Some(cb);
815 }
816 })
817 .detach();
818
819 None
820}
821
822fn handle_create_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
823 if state_ptr.hide_title_bar {
824 notify_frame_changed(handle);
825 Some(0)
826 } else {
827 None
828 }
829}
830
831fn handle_dpi_changed_msg(
832 handle: HWND,
833 wparam: WPARAM,
834 lparam: LPARAM,
835 state_ptr: Rc<WindowsWindowStatePtr>,
836) -> Option<isize> {
837 let new_dpi = wparam.loword() as f32;
838 let mut lock = state_ptr.state.borrow_mut();
839 lock.scale_factor = new_dpi / USER_DEFAULT_SCREEN_DPI as f32;
840 lock.border_offset.update(handle).log_err();
841 drop(lock);
842
843 let rect = unsafe { &*(lparam.0 as *const RECT) };
844 let width = rect.right - rect.left;
845 let height = rect.bottom - rect.top;
846 // this will emit `WM_SIZE` and `WM_MOVE` right here
847 // even before this function returns
848 // the new size is handled in `WM_SIZE`
849 unsafe {
850 SetWindowPos(
851 handle,
852 None,
853 rect.left,
854 rect.top,
855 width,
856 height,
857 SWP_NOZORDER | SWP_NOACTIVATE,
858 )
859 .context("unable to set window position after dpi has changed")
860 .log_err();
861 }
862
863 Some(0)
864}
865
866/// The following conditions will trigger this event:
867/// 1. The monitor on which the window is located goes offline or changes resolution.
868/// 2. Another monitor goes offline, is plugged in, or changes resolution.
869///
870/// In either case, the window will only receive information from the monitor on which
871/// it is located.
872///
873/// For example, in the case of condition 2, where the monitor on which the window is
874/// located has actually changed nothing, it will still receive this event.
875fn handle_display_change_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
876 // NOTE:
877 // Even the `lParam` holds the resolution of the screen, we just ignore it.
878 // Because WM_DPICHANGED, WM_MOVE, WM_SIZE will come first, window reposition and resize
879 // are handled there.
880 // So we only care about if monitor is disconnected.
881 let previous_monitor = state_ptr.as_ref().state.borrow().display;
882 if WindowsDisplay::is_connected(previous_monitor.handle) {
883 // we are fine, other display changed
884 return None;
885 }
886 // display disconnected
887 // in this case, the OS will move our window to another monitor, and minimize it.
888 // we deminimize the window and query the monitor after moving
889 unsafe {
890 let _ = ShowWindow(handle, SW_SHOWNORMAL);
891 };
892 let new_monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
893 // all monitors disconnected
894 if new_monitor.is_invalid() {
895 log::error!("No monitor detected!");
896 return None;
897 }
898 let new_display = WindowsDisplay::new_with_handle(new_monitor);
899 state_ptr.as_ref().state.borrow_mut().display = new_display;
900 Some(0)
901}
902
903fn handle_hit_test_msg(
904 handle: HWND,
905 msg: u32,
906 wparam: WPARAM,
907 lparam: LPARAM,
908 state_ptr: Rc<WindowsWindowStatePtr>,
909) -> Option<isize> {
910 if !state_ptr.is_movable {
911 return None;
912 }
913 if !state_ptr.hide_title_bar {
914 return None;
915 }
916
917 // default handler for resize areas
918 let hit = unsafe { DefWindowProcW(handle, msg, wparam, lparam) };
919 if matches!(
920 hit.0 as u32,
921 HTNOWHERE
922 | HTRIGHT
923 | HTLEFT
924 | HTTOPLEFT
925 | HTTOP
926 | HTTOPRIGHT
927 | HTBOTTOMRIGHT
928 | HTBOTTOM
929 | HTBOTTOMLEFT
930 ) {
931 return Some(hit.0);
932 }
933
934 if state_ptr.state.borrow().is_fullscreen() {
935 return Some(HTCLIENT as _);
936 }
937
938 let dpi = unsafe { GetDpiForWindow(handle) };
939 let frame_y = unsafe { GetSystemMetricsForDpi(SM_CYFRAME, dpi) };
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 if !state_ptr.state.borrow().is_maximized() && cursor_point.y >= 0 && cursor_point.y <= frame_y
947 {
948 return Some(HTTOP as _);
949 }
950
951 let titlebar_rect = state_ptr.state.borrow().get_titlebar_rect();
952 if let Ok(titlebar_rect) = titlebar_rect {
953 if cursor_point.y < titlebar_rect.bottom {
954 let caption_btn_width = (state_ptr.state.borrow().caption_button_width().0
955 * state_ptr.state.borrow().scale_factor) as i32;
956 if cursor_point.x >= titlebar_rect.right - caption_btn_width {
957 return Some(HTCLOSE as _);
958 } else if cursor_point.x >= titlebar_rect.right - caption_btn_width * 2 {
959 return Some(HTMAXBUTTON as _);
960 } else if cursor_point.x >= titlebar_rect.right - caption_btn_width * 3 {
961 return Some(HTMINBUTTON as _);
962 }
963
964 return Some(HTCAPTION as _);
965 }
966 }
967
968 Some(HTCLIENT as _)
969}
970
971fn handle_nc_mouse_move_msg(
972 handle: HWND,
973 lparam: LPARAM,
974 state_ptr: Rc<WindowsWindowStatePtr>,
975) -> Option<isize> {
976 if !state_ptr.hide_title_bar {
977 return None;
978 }
979
980 start_tracking_mouse(handle, &state_ptr, TME_LEAVE | TME_NONCLIENT);
981
982 let mut lock = state_ptr.state.borrow_mut();
983 if let Some(mut callback) = lock.callbacks.input.take() {
984 let scale_factor = lock.scale_factor;
985 drop(lock);
986 let mut cursor_point = POINT {
987 x: lparam.signed_loword().into(),
988 y: lparam.signed_hiword().into(),
989 };
990 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
991 let event = MouseMoveEvent {
992 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
993 pressed_button: None,
994 modifiers: current_modifiers(),
995 };
996 let result = if callback(PlatformInput::MouseMove(event)).default_prevented {
997 Some(0)
998 } else {
999 Some(1)
1000 };
1001 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
1002
1003 result
1004 } else {
1005 None
1006 }
1007}
1008
1009fn handle_nc_mouse_down_msg(
1010 handle: HWND,
1011 button: MouseButton,
1012 wparam: WPARAM,
1013 lparam: LPARAM,
1014 state_ptr: Rc<WindowsWindowStatePtr>,
1015) -> Option<isize> {
1016 if !state_ptr.hide_title_bar {
1017 return None;
1018 }
1019
1020 let mut lock = state_ptr.state.borrow_mut();
1021 if let Some(mut callback) = lock.callbacks.input.take() {
1022 let scale_factor = lock.scale_factor;
1023 let mut cursor_point = POINT {
1024 x: lparam.signed_loword().into(),
1025 y: lparam.signed_hiword().into(),
1026 };
1027 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1028 let physical_point = point(DevicePixels(cursor_point.x), DevicePixels(cursor_point.y));
1029 let click_count = lock.click_state.update(button, physical_point);
1030 drop(lock);
1031 let event = MouseDownEvent {
1032 button,
1033 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1034 modifiers: current_modifiers(),
1035 click_count,
1036 first_mouse: false,
1037 };
1038 let result = if callback(PlatformInput::MouseDown(event)).default_prevented {
1039 Some(0)
1040 } else {
1041 None
1042 };
1043 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
1044
1045 if result.is_some() {
1046 return result;
1047 }
1048 } else {
1049 drop(lock);
1050 };
1051
1052 // Since these are handled in handle_nc_mouse_up_msg we must prevent the default window proc
1053 if button == MouseButton::Left {
1054 match wparam.0 as u32 {
1055 HTMINBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMINBUTTON),
1056 HTMAXBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMAXBUTTON),
1057 HTCLOSE => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTCLOSE),
1058 _ => return None,
1059 };
1060 Some(0)
1061 } else {
1062 None
1063 }
1064}
1065
1066fn handle_nc_mouse_up_msg(
1067 handle: HWND,
1068 button: MouseButton,
1069 wparam: WPARAM,
1070 lparam: LPARAM,
1071 state_ptr: Rc<WindowsWindowStatePtr>,
1072) -> Option<isize> {
1073 if !state_ptr.hide_title_bar {
1074 return None;
1075 }
1076
1077 let mut lock = state_ptr.state.borrow_mut();
1078 if let Some(mut callback) = lock.callbacks.input.take() {
1079 let scale_factor = lock.scale_factor;
1080 drop(lock);
1081 let mut cursor_point = POINT {
1082 x: lparam.signed_loword().into(),
1083 y: lparam.signed_hiword().into(),
1084 };
1085 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
1086 let event = MouseUpEvent {
1087 button,
1088 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
1089 modifiers: current_modifiers(),
1090 click_count: 1,
1091 };
1092 let result = if callback(PlatformInput::MouseUp(event)).default_prevented {
1093 Some(0)
1094 } else {
1095 None
1096 };
1097 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
1098 if result.is_some() {
1099 return result;
1100 }
1101 } else {
1102 drop(lock);
1103 }
1104
1105 let last_pressed = state_ptr.state.borrow_mut().nc_button_pressed.take();
1106 if button == MouseButton::Left && last_pressed.is_some() {
1107 let last_button = last_pressed.unwrap();
1108 let mut handled = false;
1109 match wparam.0 as u32 {
1110 HTMINBUTTON => {
1111 if last_button == HTMINBUTTON {
1112 unsafe { ShowWindowAsync(handle, SW_MINIMIZE).ok().log_err() };
1113 handled = true;
1114 }
1115 }
1116 HTMAXBUTTON => {
1117 if last_button == HTMAXBUTTON {
1118 if state_ptr.state.borrow().is_maximized() {
1119 unsafe { ShowWindowAsync(handle, SW_NORMAL).ok().log_err() };
1120 } else {
1121 unsafe { ShowWindowAsync(handle, SW_MAXIMIZE).ok().log_err() };
1122 }
1123 handled = true;
1124 }
1125 }
1126 HTCLOSE => {
1127 if last_button == HTCLOSE {
1128 unsafe {
1129 PostMessageW(Some(handle), WM_CLOSE, WPARAM::default(), LPARAM::default())
1130 .log_err()
1131 };
1132 handled = true;
1133 }
1134 }
1135 _ => {}
1136 };
1137 if handled {
1138 return Some(0);
1139 }
1140 }
1141
1142 None
1143}
1144
1145fn handle_cursor_changed(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1146 let mut state = state_ptr.state.borrow_mut();
1147 let had_cursor = state.current_cursor.is_some();
1148
1149 state.current_cursor = if lparam.0 == 0 {
1150 None
1151 } else {
1152 Some(HCURSOR(lparam.0 as _))
1153 };
1154
1155 if had_cursor != state.current_cursor.is_some() {
1156 unsafe { SetCursor(state.current_cursor) };
1157 }
1158
1159 Some(0)
1160}
1161
1162fn handle_set_cursor(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1163 if matches!(
1164 lparam.loword() as u32,
1165 HTLEFT | HTRIGHT | HTTOP | HTTOPLEFT | HTTOPRIGHT | HTBOTTOM | HTBOTTOMLEFT | HTBOTTOMRIGHT
1166 ) {
1167 return None;
1168 }
1169 unsafe {
1170 SetCursor(state_ptr.state.borrow().current_cursor);
1171 };
1172 Some(1)
1173}
1174
1175fn handle_system_settings_changed(
1176 handle: HWND,
1177 lparam: LPARAM,
1178 state_ptr: Rc<WindowsWindowStatePtr>,
1179) -> Option<isize> {
1180 let mut lock = state_ptr.state.borrow_mut();
1181 let display = lock.display;
1182 // system settings
1183 lock.system_settings.update(display);
1184 // mouse double click
1185 lock.click_state.system_update();
1186 // window border offset
1187 lock.border_offset.update(handle).log_err();
1188 drop(lock);
1189
1190 // lParam is a pointer to a string that indicates the area containing the system parameter
1191 // that was changed.
1192 let parameter = PCWSTR::from_raw(lparam.0 as _);
1193 if unsafe { !parameter.is_null() && !parameter.is_empty() } {
1194 if let Some(parameter_string) = unsafe { parameter.to_string() }.log_err() {
1195 log::info!("System settings changed: {}", parameter_string);
1196 match parameter_string.as_str() {
1197 "ImmersiveColorSet" => {
1198 handle_system_theme_changed(handle, state_ptr);
1199 }
1200 _ => {}
1201 }
1202 }
1203 }
1204
1205 // Force to trigger WM_NCCALCSIZE event to ensure that we handle auto hide
1206 // taskbar correctly.
1207 notify_frame_changed(handle);
1208 Some(0)
1209}
1210
1211fn handle_system_command(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1212 if wparam.0 == SC_KEYMENU as usize {
1213 let mut lock = state_ptr.state.borrow_mut();
1214 if lock.system_key_handled {
1215 lock.system_key_handled = false;
1216 return Some(0);
1217 }
1218 }
1219 None
1220}
1221
1222fn handle_system_theme_changed(
1223 handle: HWND,
1224 state_ptr: Rc<WindowsWindowStatePtr>,
1225) -> Option<isize> {
1226 let mut callback = state_ptr
1227 .state
1228 .borrow_mut()
1229 .callbacks
1230 .appearance_changed
1231 .take()?;
1232 callback();
1233 state_ptr.state.borrow_mut().callbacks.appearance_changed = Some(callback);
1234 configure_dwm_dark_mode(handle);
1235 Some(0)
1236}
1237
1238fn handle_input_language_changed(
1239 lparam: LPARAM,
1240 state_ptr: Rc<WindowsWindowStatePtr>,
1241) -> Option<isize> {
1242 let thread = state_ptr.main_thread_id_win32;
1243 let validation = state_ptr.validation_number;
1244 unsafe {
1245 PostThreadMessageW(thread, WM_INPUTLANGCHANGE, WPARAM(validation), lparam).log_err();
1246 }
1247 Some(0)
1248}
1249
1250fn handle_key_event<F>(
1251 wparam: WPARAM,
1252 lparam: LPARAM,
1253 state: &mut WindowsWindowState,
1254 f: F,
1255) -> Option<PlatformInput>
1256where
1257 F: FnOnce(Keystroke) -> PlatformInput,
1258{
1259 state.suppress_next_char_msg = false;
1260 let virtual_key = VIRTUAL_KEY(wparam.loword());
1261 let mut modifiers = current_modifiers();
1262
1263 match virtual_key {
1264 VK_PROCESSKEY => {
1265 // IME composition
1266 None
1267 }
1268 VK_SHIFT | VK_CONTROL | VK_MENU | VK_LWIN | VK_RWIN => {
1269 if state
1270 .last_reported_modifiers
1271 .is_some_and(|prev_modifiers| prev_modifiers == modifiers)
1272 {
1273 return None;
1274 }
1275 state.last_reported_modifiers = Some(modifiers);
1276 Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1277 modifiers,
1278 }))
1279 }
1280 vkey => {
1281 let keystroke = parse_normal_key(vkey, lparam, modifiers)?;
1282 Some(f(keystroke))
1283 }
1284 }
1285}
1286
1287fn parse_immutable(vkey: VIRTUAL_KEY) -> Option<String> {
1288 Some(
1289 match vkey {
1290 VK_SPACE => "space",
1291 VK_BACK => "backspace",
1292 VK_RETURN => "enter",
1293 VK_TAB => "tab",
1294 VK_UP => "up",
1295 VK_DOWN => "down",
1296 VK_RIGHT => "right",
1297 VK_LEFT => "left",
1298 VK_HOME => "home",
1299 VK_END => "end",
1300 VK_PRIOR => "pageup",
1301 VK_NEXT => "pagedown",
1302 VK_BROWSER_BACK => "back",
1303 VK_BROWSER_FORWARD => "forward",
1304 VK_ESCAPE => "escape",
1305 VK_INSERT => "insert",
1306 VK_DELETE => "delete",
1307 VK_APPS => "menu",
1308 VK_F1 => "f1",
1309 VK_F2 => "f2",
1310 VK_F3 => "f3",
1311 VK_F4 => "f4",
1312 VK_F5 => "f5",
1313 VK_F6 => "f6",
1314 VK_F7 => "f7",
1315 VK_F8 => "f8",
1316 VK_F9 => "f9",
1317 VK_F10 => "f10",
1318 VK_F11 => "f11",
1319 VK_F12 => "f12",
1320 VK_F13 => "f13",
1321 VK_F14 => "f14",
1322 VK_F15 => "f15",
1323 VK_F16 => "f16",
1324 VK_F17 => "f17",
1325 VK_F18 => "f18",
1326 VK_F19 => "f19",
1327 VK_F20 => "f20",
1328 VK_F21 => "f21",
1329 VK_F22 => "f22",
1330 VK_F23 => "f23",
1331 VK_F24 => "f24",
1332 _ => return None,
1333 }
1334 .to_string(),
1335 )
1336}
1337
1338fn parse_normal_key(
1339 vkey: VIRTUAL_KEY,
1340 lparam: LPARAM,
1341 mut modifiers: Modifiers,
1342) -> Option<Keystroke> {
1343 let mut key_char = None;
1344 let key = parse_immutable(vkey).or_else(|| {
1345 let scan_code = lparam.hiword() & 0xFF;
1346 key_char = generate_key_char(
1347 vkey,
1348 scan_code as u32,
1349 modifiers.control,
1350 modifiers.shift,
1351 modifiers.alt,
1352 );
1353 get_keystroke_key(vkey, scan_code as u32, &mut modifiers)
1354 })?;
1355 Some(Keystroke {
1356 modifiers,
1357 key,
1358 key_char,
1359 })
1360}
1361
1362fn parse_ime_compostion_string(ctx: HIMC) -> Option<String> {
1363 unsafe {
1364 let string_len = ImmGetCompositionStringW(ctx, GCS_COMPSTR, None, 0);
1365 if string_len >= 0 {
1366 let mut buffer = vec![0u8; string_len as usize + 2];
1367 ImmGetCompositionStringW(
1368 ctx,
1369 GCS_COMPSTR,
1370 Some(buffer.as_mut_ptr() as _),
1371 string_len as _,
1372 );
1373 let wstring = std::slice::from_raw_parts::<u16>(
1374 buffer.as_mut_ptr().cast::<u16>(),
1375 string_len as usize / 2,
1376 );
1377 Some(String::from_utf16_lossy(wstring))
1378 } else {
1379 None
1380 }
1381 }
1382}
1383
1384#[inline]
1385fn retrieve_composition_cursor_position(ctx: HIMC) -> usize {
1386 unsafe { ImmGetCompositionStringW(ctx, GCS_CURSORPOS, None, 0) as usize }
1387}
1388
1389fn parse_ime_compostion_result(ctx: HIMC) -> Option<String> {
1390 unsafe {
1391 let string_len = ImmGetCompositionStringW(ctx, GCS_RESULTSTR, None, 0);
1392 if string_len >= 0 {
1393 let mut buffer = vec![0u8; string_len as usize + 2];
1394 ImmGetCompositionStringW(
1395 ctx,
1396 GCS_RESULTSTR,
1397 Some(buffer.as_mut_ptr() as _),
1398 string_len as _,
1399 );
1400 let wstring = std::slice::from_raw_parts::<u16>(
1401 buffer.as_mut_ptr().cast::<u16>(),
1402 string_len as usize / 2,
1403 );
1404 let string = String::from_utf16_lossy(wstring);
1405 Some(string)
1406 } else {
1407 None
1408 }
1409 }
1410}
1411
1412#[inline]
1413fn is_virtual_key_pressed(vkey: VIRTUAL_KEY) -> bool {
1414 unsafe { GetKeyState(vkey.0 as i32) < 0 }
1415}
1416
1417#[inline]
1418pub(crate) fn current_modifiers() -> Modifiers {
1419 Modifiers {
1420 control: is_virtual_key_pressed(VK_CONTROL),
1421 alt: is_virtual_key_pressed(VK_MENU),
1422 shift: is_virtual_key_pressed(VK_SHIFT),
1423 platform: is_virtual_key_pressed(VK_LWIN) || is_virtual_key_pressed(VK_RWIN),
1424 function: false,
1425 }
1426}
1427
1428fn get_client_area_insets(
1429 handle: HWND,
1430 is_maximized: bool,
1431 windows_version: WindowsVersion,
1432) -> RECT {
1433 // For maximized windows, Windows outdents the window rect from the screen's client rect
1434 // by `frame_thickness` on each edge, meaning `insets` must contain `frame_thickness`
1435 // on all sides (including the top) to avoid the client area extending onto adjacent
1436 // monitors.
1437 //
1438 // For non-maximized windows, things become complicated:
1439 //
1440 // - On Windows 10
1441 // The top inset must be zero, since if there is any nonclient area, Windows will draw
1442 // a full native titlebar outside the client area. (This doesn't occur in the maximized
1443 // case.)
1444 //
1445 // - On Windows 11
1446 // The top inset is calculated using an empirical formula that I derived through various
1447 // tests. Without this, the top 1-2 rows of pixels in our window would be obscured.
1448 let dpi = unsafe { GetDpiForWindow(handle) };
1449 let frame_thickness = get_frame_thickness(dpi);
1450 let top_insets = if is_maximized {
1451 frame_thickness
1452 } else {
1453 match windows_version {
1454 WindowsVersion::Win10 => 0,
1455 WindowsVersion::Win11 => (dpi as f32 / USER_DEFAULT_SCREEN_DPI as f32).round() as i32,
1456 }
1457 };
1458 RECT {
1459 left: frame_thickness,
1460 top: top_insets,
1461 right: frame_thickness,
1462 bottom: frame_thickness,
1463 }
1464}
1465
1466// there is some additional non-visible space when talking about window
1467// borders on Windows:
1468// - SM_CXSIZEFRAME: The resize handle.
1469// - SM_CXPADDEDBORDER: Additional border space that isn't part of the resize handle.
1470fn get_frame_thickness(dpi: u32) -> i32 {
1471 let resize_frame_thickness = unsafe { GetSystemMetricsForDpi(SM_CXSIZEFRAME, dpi) };
1472 let padding_thickness = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
1473 resize_frame_thickness + padding_thickness
1474}
1475
1476fn notify_frame_changed(handle: HWND) {
1477 unsafe {
1478 SetWindowPos(
1479 handle,
1480 None,
1481 0,
1482 0,
1483 0,
1484 0,
1485 SWP_FRAMECHANGED
1486 | SWP_NOACTIVATE
1487 | SWP_NOCOPYBITS
1488 | SWP_NOMOVE
1489 | SWP_NOOWNERZORDER
1490 | SWP_NOREPOSITION
1491 | SWP_NOSENDCHANGING
1492 | SWP_NOSIZE
1493 | SWP_NOZORDER,
1494 )
1495 .log_err();
1496 }
1497}
1498
1499fn start_tracking_mouse(
1500 handle: HWND,
1501 state_ptr: &Rc<WindowsWindowStatePtr>,
1502 flags: TRACKMOUSEEVENT_FLAGS,
1503) {
1504 let mut lock = state_ptr.state.borrow_mut();
1505 if !lock.hovered {
1506 lock.hovered = true;
1507 unsafe {
1508 TrackMouseEvent(&mut TRACKMOUSEEVENT {
1509 cbSize: std::mem::size_of::<TRACKMOUSEEVENT>() as u32,
1510 dwFlags: flags,
1511 hwndTrack: handle,
1512 dwHoverTime: HOVER_DEFAULT,
1513 })
1514 .log_err()
1515 };
1516 if let Some(mut callback) = lock.callbacks.hovered_status_change.take() {
1517 drop(lock);
1518 callback(true);
1519 state_ptr.state.borrow_mut().callbacks.hovered_status_change = Some(callback);
1520 }
1521 }
1522}
1523
1524fn with_input_handler<F, R>(state_ptr: &Rc<WindowsWindowStatePtr>, f: F) -> Option<R>
1525where
1526 F: FnOnce(&mut PlatformInputHandler) -> R,
1527{
1528 let mut lock = state_ptr.state.borrow_mut();
1529 if lock.suppress_next_char_msg {
1530 return None;
1531 }
1532 let mut input_handler = lock.input_handler.take()?;
1533 drop(lock);
1534 let result = f(&mut input_handler);
1535 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
1536 Some(result)
1537}
1538
1539fn with_input_handler_and_scale_factor<F, R>(
1540 state_ptr: &Rc<WindowsWindowStatePtr>,
1541 f: F,
1542) -> Option<R>
1543where
1544 F: FnOnce(&mut PlatformInputHandler, f32) -> Option<R>,
1545{
1546 let mut lock = state_ptr.state.borrow_mut();
1547 if lock.suppress_next_char_msg {
1548 return None;
1549 }
1550 let mut input_handler = lock.input_handler.take()?;
1551 let scale_factor = lock.scale_factor;
1552 drop(lock);
1553 let result = f(&mut input_handler, scale_factor);
1554 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
1555 result
1556}