1use std::rc::Rc;
2
3use ::util::ResultExt;
4use anyhow::Context;
5use windows::Win32::{
6 Foundation::*,
7 Graphics::Gdi::*,
8 System::SystemServices::*,
9 UI::{
10 HiDpi::*,
11 Input::{Ime::*, KeyboardAndMouse::*},
12 WindowsAndMessaging::*,
13 },
14};
15
16use crate::*;
17
18pub(crate) const CURSOR_STYLE_CHANGED: u32 = WM_USER + 1;
19pub(crate) const CLOSE_ONE_WINDOW: u32 = WM_USER + 2;
20
21const SIZE_MOVE_LOOP_TIMER_ID: usize = 1;
22
23pub(crate) fn handle_msg(
24 handle: HWND,
25 msg: u32,
26 wparam: WPARAM,
27 lparam: LPARAM,
28 state_ptr: Rc<WindowsWindowStatePtr>,
29) -> LRESULT {
30 let handled = match msg {
31 WM_ACTIVATE => handle_activate_msg(handle, wparam, state_ptr),
32 WM_CREATE => handle_create_msg(handle, state_ptr),
33 WM_MOVE => handle_move_msg(handle, lparam, state_ptr),
34 WM_SIZE => handle_size_msg(lparam, state_ptr),
35 WM_ENTERSIZEMOVE | WM_ENTERMENULOOP => handle_size_move_loop(handle),
36 WM_EXITSIZEMOVE | WM_EXITMENULOOP => handle_size_move_loop_exit(handle),
37 WM_TIMER => handle_timer_msg(handle, wparam, state_ptr),
38 WM_NCCALCSIZE => handle_calc_client_size(handle, wparam, lparam, state_ptr),
39 WM_DPICHANGED => handle_dpi_changed_msg(handle, wparam, lparam, state_ptr),
40 WM_DISPLAYCHANGE => handle_display_change_msg(handle, state_ptr),
41 WM_NCHITTEST => handle_hit_test_msg(handle, msg, wparam, lparam, state_ptr),
42 WM_PAINT => handle_paint_msg(handle, state_ptr),
43 WM_CLOSE => handle_close_msg(state_ptr),
44 WM_DESTROY => handle_destroy_msg(handle, state_ptr),
45 WM_MOUSEMOVE => handle_mouse_move_msg(lparam, wparam, state_ptr),
46 WM_NCMOUSEMOVE => handle_nc_mouse_move_msg(handle, lparam, state_ptr),
47 WM_NCLBUTTONDOWN => {
48 handle_nc_mouse_down_msg(handle, MouseButton::Left, wparam, lparam, state_ptr)
49 }
50 WM_NCRBUTTONDOWN => {
51 handle_nc_mouse_down_msg(handle, MouseButton::Right, wparam, lparam, state_ptr)
52 }
53 WM_NCMBUTTONDOWN => {
54 handle_nc_mouse_down_msg(handle, MouseButton::Middle, wparam, lparam, state_ptr)
55 }
56 WM_NCLBUTTONUP => {
57 handle_nc_mouse_up_msg(handle, MouseButton::Left, wparam, lparam, state_ptr)
58 }
59 WM_NCRBUTTONUP => {
60 handle_nc_mouse_up_msg(handle, MouseButton::Right, wparam, lparam, state_ptr)
61 }
62 WM_NCMBUTTONUP => {
63 handle_nc_mouse_up_msg(handle, MouseButton::Middle, wparam, lparam, state_ptr)
64 }
65 WM_LBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Left, lparam, state_ptr),
66 WM_RBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Right, lparam, state_ptr),
67 WM_MBUTTONDOWN => handle_mouse_down_msg(handle, MouseButton::Middle, lparam, state_ptr),
68 WM_XBUTTONDOWN => {
69 handle_xbutton_msg(handle, wparam, lparam, handle_mouse_down_msg, state_ptr)
70 }
71 WM_LBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Left, lparam, state_ptr),
72 WM_RBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Right, lparam, state_ptr),
73 WM_MBUTTONUP => handle_mouse_up_msg(handle, MouseButton::Middle, lparam, state_ptr),
74 WM_XBUTTONUP => handle_xbutton_msg(handle, wparam, lparam, handle_mouse_up_msg, state_ptr),
75 WM_MOUSEWHEEL => handle_mouse_wheel_msg(handle, wparam, lparam, state_ptr),
76 WM_MOUSEHWHEEL => handle_mouse_horizontal_wheel_msg(handle, wparam, lparam, state_ptr),
77 WM_SYSKEYDOWN => handle_syskeydown_msg(wparam, lparam, state_ptr),
78 WM_SYSKEYUP => handle_syskeyup_msg(wparam, state_ptr),
79 WM_KEYDOWN => handle_keydown_msg(wparam, lparam, state_ptr),
80 WM_KEYUP => handle_keyup_msg(wparam, state_ptr),
81 WM_CHAR => handle_char_msg(wparam, lparam, state_ptr),
82 WM_IME_STARTCOMPOSITION => handle_ime_position(handle, state_ptr),
83 WM_IME_COMPOSITION => handle_ime_composition(handle, lparam, state_ptr),
84 WM_SETCURSOR => handle_set_cursor(lparam, state_ptr),
85 WM_SETTINGCHANGE => handle_system_settings_changed(state_ptr),
86 CURSOR_STYLE_CHANGED => handle_cursor_changed(lparam, state_ptr),
87 _ => None,
88 };
89 if let Some(n) = handled {
90 LRESULT(n)
91 } else {
92 unsafe { DefWindowProcW(handle, msg, wparam, lparam) }
93 }
94}
95
96fn handle_move_msg(
97 handle: HWND,
98 lparam: LPARAM,
99 state_ptr: Rc<WindowsWindowStatePtr>,
100) -> Option<isize> {
101 let mut lock = state_ptr.state.borrow_mut();
102 let origin = logical_point(
103 lparam.signed_loword() as f32,
104 lparam.signed_hiword() as f32,
105 lock.scale_factor,
106 );
107 lock.origin = origin;
108 let size = lock.logical_size;
109 let center_x = origin.x.0 + size.width.0 / 2.;
110 let center_y = origin.y.0 + size.height.0 / 2.;
111 let monitor_bounds = lock.display.bounds();
112 if center_x < monitor_bounds.left().0
113 || center_x > monitor_bounds.right().0
114 || center_y < monitor_bounds.top().0
115 || center_y > monitor_bounds.bottom().0
116 {
117 // center of the window may have moved to another monitor
118 let monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
119 // minimize the window can trigger this event too, in this case,
120 // monitor is invalid, we do nothing.
121 if !monitor.is_invalid() && lock.display.handle != monitor {
122 // we will get the same monitor if we only have one
123 lock.display = WindowsDisplay::new_with_handle(monitor);
124 }
125 }
126 if let Some(mut callback) = lock.callbacks.moved.take() {
127 drop(lock);
128 callback();
129 state_ptr.state.borrow_mut().callbacks.moved = Some(callback);
130 }
131 Some(0)
132}
133
134fn handle_size_msg(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
135 let width = lparam.loword().max(1) as i32;
136 let height = lparam.hiword().max(1) as i32;
137 let mut lock = state_ptr.state.borrow_mut();
138 let new_size = size(DevicePixels(width), DevicePixels(height));
139 let scale_factor = lock.scale_factor;
140 lock.renderer.update_drawable_size(new_size);
141 let new_size = new_size.to_pixels(scale_factor);
142 lock.logical_size = new_size;
143 if let Some(mut callback) = lock.callbacks.resize.take() {
144 drop(lock);
145 callback(new_size, scale_factor);
146 state_ptr.state.borrow_mut().callbacks.resize = Some(callback);
147 }
148 Some(0)
149}
150
151fn handle_size_move_loop(handle: HWND) -> Option<isize> {
152 unsafe {
153 let ret = SetTimer(handle, SIZE_MOVE_LOOP_TIMER_ID, USER_TIMER_MINIMUM, None);
154 if ret == 0 {
155 log::error!(
156 "unable to create timer: {}",
157 std::io::Error::last_os_error()
158 );
159 }
160 }
161 None
162}
163
164fn handle_size_move_loop_exit(handle: HWND) -> Option<isize> {
165 unsafe {
166 KillTimer(handle, SIZE_MOVE_LOOP_TIMER_ID).log_err();
167 }
168 None
169}
170
171fn handle_timer_msg(
172 handle: HWND,
173 wparam: WPARAM,
174 state_ptr: Rc<WindowsWindowStatePtr>,
175) -> Option<isize> {
176 if wparam.0 == SIZE_MOVE_LOOP_TIMER_ID {
177 handle_paint_msg(handle, state_ptr)
178 } else {
179 None
180 }
181}
182
183fn handle_paint_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
184 let mut lock = state_ptr.state.borrow_mut();
185 if let Some(mut request_frame) = lock.callbacks.request_frame.take() {
186 drop(lock);
187 request_frame();
188 state_ptr.state.borrow_mut().callbacks.request_frame = Some(request_frame);
189 }
190 unsafe { ValidateRect(handle, None).ok().log_err() };
191 Some(0)
192}
193
194fn handle_close_msg(state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
195 let mut lock = state_ptr.state.borrow_mut();
196 if let Some(mut callback) = lock.callbacks.should_close.take() {
197 drop(lock);
198 let should_close = callback();
199 state_ptr.state.borrow_mut().callbacks.should_close = Some(callback);
200 if should_close {
201 None
202 } else {
203 Some(0)
204 }
205 } else {
206 None
207 }
208}
209
210fn handle_destroy_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
211 let callback = {
212 let mut lock = state_ptr.state.borrow_mut();
213 lock.callbacks.close.take()
214 };
215 if let Some(callback) = callback {
216 callback();
217 }
218 unsafe {
219 PostMessageW(None, CLOSE_ONE_WINDOW, None, LPARAM(handle.0)).log_err();
220 }
221 Some(0)
222}
223
224fn handle_mouse_move_msg(
225 lparam: LPARAM,
226 wparam: WPARAM,
227 state_ptr: Rc<WindowsWindowStatePtr>,
228) -> Option<isize> {
229 let mut lock = state_ptr.state.borrow_mut();
230 if let Some(mut callback) = lock.callbacks.input.take() {
231 let scale_factor = lock.scale_factor;
232 drop(lock);
233 let pressed_button = match MODIFIERKEYS_FLAGS(wparam.loword() as u32) {
234 flags if flags.contains(MK_LBUTTON) => Some(MouseButton::Left),
235 flags if flags.contains(MK_RBUTTON) => Some(MouseButton::Right),
236 flags if flags.contains(MK_MBUTTON) => Some(MouseButton::Middle),
237 flags if flags.contains(MK_XBUTTON1) => {
238 Some(MouseButton::Navigate(NavigationDirection::Back))
239 }
240 flags if flags.contains(MK_XBUTTON2) => {
241 Some(MouseButton::Navigate(NavigationDirection::Forward))
242 }
243 _ => None,
244 };
245 let x = lparam.signed_loword() as f32;
246 let y = lparam.signed_hiword() as f32;
247 let event = MouseMoveEvent {
248 position: logical_point(x, y, scale_factor),
249 pressed_button,
250 modifiers: current_modifiers(),
251 };
252 let result = if callback(PlatformInput::MouseMove(event)).default_prevented {
253 Some(0)
254 } else {
255 Some(1)
256 };
257 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
258 return result;
259 }
260 Some(1)
261}
262
263fn handle_syskeydown_msg(
264 wparam: WPARAM,
265 lparam: LPARAM,
266 state_ptr: Rc<WindowsWindowStatePtr>,
267) -> Option<isize> {
268 // we need to call `DefWindowProcW`, or we will lose the system-wide `Alt+F4`, `Alt+{other keys}`
269 // shortcuts.
270 let keystroke = parse_syskeydown_msg_keystroke(wparam)?;
271 let mut func = state_ptr.state.borrow_mut().callbacks.input.take()?;
272 let event = KeyDownEvent {
273 keystroke,
274 is_held: lparam.0 & (0x1 << 30) > 0,
275 };
276 let result = if func(PlatformInput::KeyDown(event)).default_prevented {
277 Some(0)
278 } else {
279 None
280 };
281 state_ptr.state.borrow_mut().callbacks.input = Some(func);
282
283 result
284}
285
286fn handle_syskeyup_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
287 // we need to call `DefWindowProcW`, or we will lose the system-wide `Alt+F4`, `Alt+{other keys}`
288 // shortcuts.
289 let keystroke = parse_syskeydown_msg_keystroke(wparam)?;
290 let mut func = state_ptr.state.borrow_mut().callbacks.input.take()?;
291 let event = KeyUpEvent { keystroke };
292 let result = if func(PlatformInput::KeyUp(event)).default_prevented {
293 Some(0)
294 } else {
295 Some(1)
296 };
297 state_ptr.state.borrow_mut().callbacks.input = Some(func);
298
299 result
300}
301
302fn handle_keydown_msg(
303 wparam: WPARAM,
304 lparam: LPARAM,
305 state_ptr: Rc<WindowsWindowStatePtr>,
306) -> Option<isize> {
307 let Some(keystroke_or_modifier) = parse_keydown_msg_keystroke(wparam) else {
308 return Some(1);
309 };
310 let mut lock = state_ptr.state.borrow_mut();
311 let Some(mut func) = lock.callbacks.input.take() else {
312 return Some(1);
313 };
314 drop(lock);
315
316 let event = match keystroke_or_modifier {
317 KeystrokeOrModifier::Keystroke(keystroke) => PlatformInput::KeyDown(KeyDownEvent {
318 keystroke,
319 is_held: lparam.0 & (0x1 << 30) > 0,
320 }),
321 KeystrokeOrModifier::Modifier(modifiers) => {
322 PlatformInput::ModifiersChanged(ModifiersChangedEvent { modifiers })
323 }
324 };
325
326 let result = if func(event).default_prevented {
327 Some(0)
328 } else {
329 Some(1)
330 };
331 state_ptr.state.borrow_mut().callbacks.input = Some(func);
332
333 result
334}
335
336fn handle_keyup_msg(wparam: WPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
337 let Some(keystroke_or_modifier) = parse_keydown_msg_keystroke(wparam) else {
338 return Some(1);
339 };
340 let mut lock = state_ptr.state.borrow_mut();
341 let Some(mut func) = lock.callbacks.input.take() else {
342 return Some(1);
343 };
344 drop(lock);
345
346 let event = match keystroke_or_modifier {
347 KeystrokeOrModifier::Keystroke(keystroke) => PlatformInput::KeyUp(KeyUpEvent { keystroke }),
348 KeystrokeOrModifier::Modifier(modifiers) => {
349 PlatformInput::ModifiersChanged(ModifiersChangedEvent { modifiers })
350 }
351 };
352
353 let result = if func(event).default_prevented {
354 Some(0)
355 } else {
356 Some(1)
357 };
358 state_ptr.state.borrow_mut().callbacks.input = Some(func);
359
360 result
361}
362
363fn handle_char_msg(
364 wparam: WPARAM,
365 lparam: LPARAM,
366 state_ptr: Rc<WindowsWindowStatePtr>,
367) -> Option<isize> {
368 let Some(keystroke) = parse_char_msg_keystroke(wparam) else {
369 return Some(1);
370 };
371 let mut lock = state_ptr.state.borrow_mut();
372 let Some(mut func) = lock.callbacks.input.take() else {
373 return Some(1);
374 };
375 drop(lock);
376 let ime_key = keystroke.ime_key.clone();
377 let event = KeyDownEvent {
378 keystroke,
379 is_held: lparam.0 & (0x1 << 30) > 0,
380 };
381
382 let dispatch_event_result = func(PlatformInput::KeyDown(event));
383 let mut lock = state_ptr.state.borrow_mut();
384 lock.callbacks.input = Some(func);
385 if dispatch_event_result.default_prevented || !dispatch_event_result.propagate {
386 return Some(0);
387 }
388 let Some(ime_char) = ime_key else {
389 return Some(1);
390 };
391 let Some(mut input_handler) = lock.input_handler.take() else {
392 return Some(1);
393 };
394 drop(lock);
395 input_handler.replace_text_in_range(None, &ime_char);
396 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
397
398 Some(0)
399}
400
401fn handle_mouse_down_msg(
402 handle: HWND,
403 button: MouseButton,
404 lparam: LPARAM,
405 state_ptr: Rc<WindowsWindowStatePtr>,
406) -> Option<isize> {
407 unsafe { SetCapture(handle) };
408 let mut lock = state_ptr.state.borrow_mut();
409 if let Some(mut callback) = lock.callbacks.input.take() {
410 let x = lparam.signed_loword() as f32;
411 let y = lparam.signed_hiword() as f32;
412 let physical_point = point(DevicePixels(x as i32), DevicePixels(y as i32));
413 let click_count = lock.click_state.update(button, physical_point);
414 let scale_factor = lock.scale_factor;
415 drop(lock);
416
417 let event = MouseDownEvent {
418 button,
419 position: logical_point(x, y, scale_factor),
420 modifiers: current_modifiers(),
421 click_count,
422 first_mouse: false,
423 };
424 let result = if callback(PlatformInput::MouseDown(event)).default_prevented {
425 Some(0)
426 } else {
427 Some(1)
428 };
429 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
430
431 result
432 } else {
433 Some(1)
434 }
435}
436
437fn handle_mouse_up_msg(
438 _handle: HWND,
439 button: MouseButton,
440 lparam: LPARAM,
441 state_ptr: Rc<WindowsWindowStatePtr>,
442) -> Option<isize> {
443 unsafe { ReleaseCapture().log_err() };
444 let mut lock = state_ptr.state.borrow_mut();
445 if let Some(mut callback) = lock.callbacks.input.take() {
446 let x = lparam.signed_loword() as f32;
447 let y = lparam.signed_hiword() as f32;
448 let click_count = lock.click_state.current_count;
449 let scale_factor = lock.scale_factor;
450 drop(lock);
451
452 let event = MouseUpEvent {
453 button,
454 position: logical_point(x, y, scale_factor),
455 modifiers: current_modifiers(),
456 click_count,
457 };
458 let result = if callback(PlatformInput::MouseUp(event)).default_prevented {
459 Some(0)
460 } else {
461 Some(1)
462 };
463 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
464
465 result
466 } else {
467 Some(1)
468 }
469}
470
471fn handle_xbutton_msg(
472 handle: HWND,
473 wparam: WPARAM,
474 lparam: LPARAM,
475 handler: impl Fn(HWND, MouseButton, LPARAM, Rc<WindowsWindowStatePtr>) -> Option<isize>,
476 state_ptr: Rc<WindowsWindowStatePtr>,
477) -> Option<isize> {
478 let nav_dir = match wparam.hiword() {
479 XBUTTON1 => NavigationDirection::Back,
480 XBUTTON2 => NavigationDirection::Forward,
481 _ => return Some(1),
482 };
483 handler(handle, MouseButton::Navigate(nav_dir), lparam, state_ptr)
484}
485
486fn handle_mouse_wheel_msg(
487 handle: HWND,
488 wparam: WPARAM,
489 lparam: LPARAM,
490 state_ptr: Rc<WindowsWindowStatePtr>,
491) -> Option<isize> {
492 let mut lock = state_ptr.state.borrow_mut();
493 if let Some(mut callback) = lock.callbacks.input.take() {
494 let scale_factor = lock.scale_factor;
495 let wheel_scroll_lines = lock.system_settings.mouse_wheel_settings.wheel_scroll_lines;
496 drop(lock);
497 let wheel_distance =
498 (wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_lines as f32;
499 let mut cursor_point = POINT {
500 x: lparam.signed_loword().into(),
501 y: lparam.signed_hiword().into(),
502 };
503 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
504 let event = ScrollWheelEvent {
505 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
506 delta: ScrollDelta::Lines(Point {
507 x: 0.0,
508 y: wheel_distance,
509 }),
510 modifiers: current_modifiers(),
511 touch_phase: TouchPhase::Moved,
512 };
513 let result = if callback(PlatformInput::ScrollWheel(event)).default_prevented {
514 Some(0)
515 } else {
516 Some(1)
517 };
518 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
519
520 result
521 } else {
522 Some(1)
523 }
524}
525
526fn handle_mouse_horizontal_wheel_msg(
527 handle: HWND,
528 wparam: WPARAM,
529 lparam: LPARAM,
530 state_ptr: Rc<WindowsWindowStatePtr>,
531) -> Option<isize> {
532 let mut lock = state_ptr.state.borrow_mut();
533 if let Some(mut callback) = lock.callbacks.input.take() {
534 let scale_factor = lock.scale_factor;
535 let wheel_scroll_chars = lock.system_settings.mouse_wheel_settings.wheel_scroll_chars;
536 drop(lock);
537 let wheel_distance =
538 (-wparam.signed_hiword() as f32 / WHEEL_DELTA as f32) * wheel_scroll_chars as f32;
539 let mut cursor_point = POINT {
540 x: lparam.signed_loword().into(),
541 y: lparam.signed_hiword().into(),
542 };
543 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
544 let event = ScrollWheelEvent {
545 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
546 delta: ScrollDelta::Lines(Point {
547 x: wheel_distance,
548 y: 0.0,
549 }),
550 modifiers: current_modifiers(),
551 touch_phase: TouchPhase::Moved,
552 };
553 let result = if callback(PlatformInput::ScrollWheel(event)).default_prevented {
554 Some(0)
555 } else {
556 Some(1)
557 };
558 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
559
560 result
561 } else {
562 Some(1)
563 }
564}
565
566fn handle_ime_position(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
567 unsafe {
568 let mut lock = state_ptr.state.borrow_mut();
569 let ctx = ImmGetContext(handle);
570 let Some(mut input_handler) = lock.input_handler.take() else {
571 return Some(1);
572 };
573 let scale_factor = lock.scale_factor;
574 drop(lock);
575
576 let Some(caret_range) = input_handler.selected_text_range() else {
577 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
578 return Some(0);
579 };
580 let caret_position = input_handler.bounds_for_range(caret_range).unwrap();
581 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
582 let config = CANDIDATEFORM {
583 dwStyle: CFS_CANDIDATEPOS,
584 // logical to physical
585 ptCurrentPos: POINT {
586 x: (caret_position.origin.x.0 * scale_factor) as i32,
587 y: (caret_position.origin.y.0 * scale_factor) as i32
588 + ((caret_position.size.height.0 * scale_factor) as i32 / 2),
589 },
590 ..Default::default()
591 };
592 ImmSetCandidateWindow(ctx, &config as _).ok().log_err();
593 ImmReleaseContext(handle, ctx).ok().log_err();
594 Some(0)
595 }
596}
597
598fn handle_ime_composition(
599 handle: HWND,
600 lparam: LPARAM,
601 state_ptr: Rc<WindowsWindowStatePtr>,
602) -> Option<isize> {
603 let mut ime_input = None;
604 if lparam.0 as u32 & GCS_COMPSTR.0 > 0 {
605 let (comp_string, string_len) = parse_ime_compostion_string(handle)?;
606 let mut input_handler = state_ptr.state.borrow_mut().input_handler.take()?;
607 input_handler.replace_and_mark_text_in_range(
608 None,
609 &comp_string,
610 Some(string_len..string_len),
611 );
612 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
613 ime_input = Some(comp_string);
614 }
615 if lparam.0 as u32 & GCS_CURSORPOS.0 > 0 {
616 let comp_string = &ime_input?;
617 let caret_pos = retrieve_composition_cursor_position(handle);
618 let mut input_handler = state_ptr.state.borrow_mut().input_handler.take()?;
619 input_handler.replace_and_mark_text_in_range(None, comp_string, Some(caret_pos..caret_pos));
620 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
621 }
622 if lparam.0 as u32 & GCS_RESULTSTR.0 > 0 {
623 let comp_result = parse_ime_compostion_result(handle)?;
624 let mut lock = state_ptr.state.borrow_mut();
625 let Some(mut input_handler) = lock.input_handler.take() else {
626 return Some(1);
627 };
628 drop(lock);
629 input_handler.replace_text_in_range(None, &comp_result);
630 state_ptr.state.borrow_mut().input_handler = Some(input_handler);
631 return Some(0);
632 }
633 // currently, we don't care other stuff
634 None
635}
636
637/// SEE: https://learn.microsoft.com/en-us/windows/win32/winmsg/wm-nccalcsize
638fn handle_calc_client_size(
639 handle: HWND,
640 wparam: WPARAM,
641 lparam: LPARAM,
642 state_ptr: Rc<WindowsWindowStatePtr>,
643) -> Option<isize> {
644 if !state_ptr.hide_title_bar || state_ptr.state.borrow().is_fullscreen() || wparam.0 == 0 {
645 return None;
646 }
647
648 let dpi = unsafe { GetDpiForWindow(handle) };
649
650 let frame_x = unsafe { GetSystemMetricsForDpi(SM_CXFRAME, dpi) };
651 let frame_y = unsafe { GetSystemMetricsForDpi(SM_CYFRAME, dpi) };
652 let padding = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
653
654 // wparam is TRUE so lparam points to an NCCALCSIZE_PARAMS structure
655 let mut params = lparam.0 as *mut NCCALCSIZE_PARAMS;
656 let mut requested_client_rect = unsafe { &mut ((*params).rgrc) };
657
658 requested_client_rect[0].right -= frame_x + padding;
659 requested_client_rect[0].left += frame_x + padding;
660 requested_client_rect[0].bottom -= frame_y + padding;
661
662 Some(0)
663}
664
665fn handle_activate_msg(
666 handle: HWND,
667 wparam: WPARAM,
668 state_ptr: Rc<WindowsWindowStatePtr>,
669) -> Option<isize> {
670 let activated = wparam.loword() > 0;
671 if state_ptr.hide_title_bar {
672 if let Some(titlebar_rect) = state_ptr.state.borrow().get_titlebar_rect().log_err() {
673 unsafe {
674 InvalidateRect(handle, Some(&titlebar_rect), FALSE)
675 .ok()
676 .log_err()
677 };
678 }
679 }
680 let this = state_ptr.clone();
681 state_ptr
682 .executor
683 .spawn(async move {
684 let mut lock = this.state.borrow_mut();
685 if let Some(mut cb) = lock.callbacks.active_status_change.take() {
686 drop(lock);
687 cb(activated);
688 this.state.borrow_mut().callbacks.active_status_change = Some(cb);
689 }
690 })
691 .detach();
692
693 None
694}
695
696fn handle_create_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
697 let mut size_rect = RECT::default();
698 unsafe { GetWindowRect(handle, &mut size_rect).log_err() };
699
700 let width = size_rect.right - size_rect.left;
701 let height = size_rect.bottom - size_rect.top;
702
703 if state_ptr.hide_title_bar {
704 unsafe {
705 SetWindowPos(
706 handle,
707 None,
708 size_rect.left,
709 size_rect.top,
710 width,
711 height,
712 SWP_FRAMECHANGED | SWP_NOMOVE | SWP_NOSIZE,
713 )
714 .log_err()
715 };
716 }
717
718 Some(0)
719}
720
721fn handle_dpi_changed_msg(
722 handle: HWND,
723 wparam: WPARAM,
724 lparam: LPARAM,
725 state_ptr: Rc<WindowsWindowStatePtr>,
726) -> Option<isize> {
727 let new_dpi = wparam.loword() as f32;
728 state_ptr.state.borrow_mut().scale_factor = new_dpi / USER_DEFAULT_SCREEN_DPI as f32;
729
730 let rect = unsafe { &*(lparam.0 as *const RECT) };
731 let width = rect.right - rect.left;
732 let height = rect.bottom - rect.top;
733 // this will emit `WM_SIZE` and `WM_MOVE` right here
734 // even before this function returns
735 // the new size is handled in `WM_SIZE`
736 unsafe {
737 SetWindowPos(
738 handle,
739 None,
740 rect.left,
741 rect.top,
742 width,
743 height,
744 SWP_NOZORDER | SWP_NOACTIVATE,
745 )
746 .context("unable to set window position after dpi has changed")
747 .log_err();
748 }
749
750 Some(0)
751}
752
753/// The following conditions will trigger this event:
754/// 1. The monitor on which the window is located goes offline or changes resolution.
755/// 2. Another monitor goes offline, is plugged in, or changes resolution.
756///
757/// In either case, the window will only receive information from the monitor on which
758/// it is located.
759///
760/// For example, in the case of condition 2, where the monitor on which the window is
761/// located has actually changed nothing, it will still receive this event.
762fn handle_display_change_msg(handle: HWND, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
763 // NOTE:
764 // Even the `lParam` holds the resolution of the screen, we just ignore it.
765 // Because WM_DPICHANGED, WM_MOVE, WM_SIEZ will come first, window reposition and resize
766 // are handled there.
767 // So we only care about if monitor is disconnected.
768 let previous_monitor = state_ptr.as_ref().state.borrow().display;
769 if WindowsDisplay::is_connected(previous_monitor.handle) {
770 // we are fine, other display changed
771 return None;
772 }
773 // display disconnected
774 // in this case, the OS will move our window to another monitor, and minimize it.
775 // we deminimize the window and query the monitor after moving
776 unsafe {
777 let _ = ShowWindow(handle, SW_SHOWNORMAL);
778 };
779 let new_monitor = unsafe { MonitorFromWindow(handle, MONITOR_DEFAULTTONULL) };
780 // all monitors disconnected
781 if new_monitor.is_invalid() {
782 log::error!("No monitor detected!");
783 return None;
784 }
785 let new_display = WindowsDisplay::new_with_handle(new_monitor);
786 state_ptr.as_ref().state.borrow_mut().display = new_display;
787 Some(0)
788}
789
790fn handle_hit_test_msg(
791 handle: HWND,
792 msg: u32,
793 wparam: WPARAM,
794 lparam: LPARAM,
795 state_ptr: Rc<WindowsWindowStatePtr>,
796) -> Option<isize> {
797 if !state_ptr.hide_title_bar {
798 return None;
799 }
800
801 // default handler for resize areas
802 let hit = unsafe { DefWindowProcW(handle, msg, wparam, lparam) };
803 if matches!(
804 hit.0 as u32,
805 HTNOWHERE
806 | HTRIGHT
807 | HTLEFT
808 | HTTOPLEFT
809 | HTTOP
810 | HTTOPRIGHT
811 | HTBOTTOMRIGHT
812 | HTBOTTOM
813 | HTBOTTOMLEFT
814 ) {
815 return Some(hit.0);
816 }
817
818 if state_ptr.state.borrow().is_fullscreen() {
819 return Some(HTCLIENT as _);
820 }
821
822 let dpi = unsafe { GetDpiForWindow(handle) };
823 let frame_y = unsafe { GetSystemMetricsForDpi(SM_CYFRAME, dpi) };
824 let padding = unsafe { GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi) };
825
826 let mut cursor_point = POINT {
827 x: lparam.signed_loword().into(),
828 y: lparam.signed_hiword().into(),
829 };
830 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
831 if cursor_point.y > 0 && cursor_point.y < frame_y + padding {
832 return Some(HTTOP as _);
833 }
834
835 let titlebar_rect = state_ptr.state.borrow().get_titlebar_rect();
836 if let Ok(titlebar_rect) = titlebar_rect {
837 if cursor_point.y < titlebar_rect.bottom {
838 let caption_btn_width = (state_ptr.state.borrow().caption_button_width().0
839 * state_ptr.state.borrow().scale_factor) as i32;
840 if cursor_point.x >= titlebar_rect.right - caption_btn_width {
841 return Some(HTCLOSE as _);
842 } else if cursor_point.x >= titlebar_rect.right - caption_btn_width * 2 {
843 return Some(HTMAXBUTTON as _);
844 } else if cursor_point.x >= titlebar_rect.right - caption_btn_width * 3 {
845 return Some(HTMINBUTTON as _);
846 }
847
848 return Some(HTCAPTION as _);
849 }
850 }
851
852 Some(HTCLIENT as _)
853}
854
855fn handle_nc_mouse_move_msg(
856 handle: HWND,
857 lparam: LPARAM,
858 state_ptr: Rc<WindowsWindowStatePtr>,
859) -> Option<isize> {
860 if !state_ptr.hide_title_bar {
861 return None;
862 }
863
864 let mut lock = state_ptr.state.borrow_mut();
865 if let Some(mut callback) = lock.callbacks.input.take() {
866 let scale_factor = lock.scale_factor;
867 drop(lock);
868 let mut cursor_point = POINT {
869 x: lparam.signed_loword().into(),
870 y: lparam.signed_hiword().into(),
871 };
872 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
873 let event = MouseMoveEvent {
874 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
875 pressed_button: None,
876 modifiers: current_modifiers(),
877 };
878 let result = if callback(PlatformInput::MouseMove(event)).default_prevented {
879 Some(0)
880 } else {
881 Some(1)
882 };
883 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
884
885 result
886 } else {
887 None
888 }
889}
890
891fn handle_nc_mouse_down_msg(
892 handle: HWND,
893 button: MouseButton,
894 wparam: WPARAM,
895 lparam: LPARAM,
896 state_ptr: Rc<WindowsWindowStatePtr>,
897) -> Option<isize> {
898 if !state_ptr.hide_title_bar {
899 return None;
900 }
901
902 let mut lock = state_ptr.state.borrow_mut();
903 if let Some(mut callback) = lock.callbacks.input.take() {
904 let scale_factor = lock.scale_factor;
905 let mut cursor_point = POINT {
906 x: lparam.signed_loword().into(),
907 y: lparam.signed_hiword().into(),
908 };
909 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
910 let physical_point = point(DevicePixels(cursor_point.x), DevicePixels(cursor_point.y));
911 let click_count = lock.click_state.update(button, physical_point);
912 drop(lock);
913 let event = MouseDownEvent {
914 button,
915 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
916 modifiers: current_modifiers(),
917 click_count,
918 first_mouse: false,
919 };
920 let result = if callback(PlatformInput::MouseDown(event)).default_prevented {
921 Some(0)
922 } else {
923 None
924 };
925 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
926
927 if result.is_some() {
928 return result;
929 }
930 } else {
931 drop(lock);
932 };
933
934 // Since these are handled in handle_nc_mouse_up_msg we must prevent the default window proc
935 if button == MouseButton::Left {
936 match wparam.0 as u32 {
937 HTMINBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMINBUTTON),
938 HTMAXBUTTON => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTMAXBUTTON),
939 HTCLOSE => state_ptr.state.borrow_mut().nc_button_pressed = Some(HTCLOSE),
940 _ => return None,
941 };
942 Some(0)
943 } else {
944 None
945 }
946}
947
948fn handle_nc_mouse_up_msg(
949 handle: HWND,
950 button: MouseButton,
951 wparam: WPARAM,
952 lparam: LPARAM,
953 state_ptr: Rc<WindowsWindowStatePtr>,
954) -> Option<isize> {
955 if !state_ptr.hide_title_bar {
956 return None;
957 }
958
959 let mut lock = state_ptr.state.borrow_mut();
960 if let Some(mut callback) = lock.callbacks.input.take() {
961 let scale_factor = lock.scale_factor;
962 drop(lock);
963 let mut cursor_point = POINT {
964 x: lparam.signed_loword().into(),
965 y: lparam.signed_hiword().into(),
966 };
967 unsafe { ScreenToClient(handle, &mut cursor_point).ok().log_err() };
968 let event = MouseUpEvent {
969 button,
970 position: logical_point(cursor_point.x as f32, cursor_point.y as f32, scale_factor),
971 modifiers: current_modifiers(),
972 click_count: 1,
973 };
974 let result = if callback(PlatformInput::MouseUp(event)).default_prevented {
975 Some(0)
976 } else {
977 None
978 };
979 state_ptr.state.borrow_mut().callbacks.input = Some(callback);
980 if result.is_some() {
981 return result;
982 }
983 } else {
984 drop(lock);
985 }
986
987 let last_pressed = state_ptr.state.borrow_mut().nc_button_pressed.take();
988 if button == MouseButton::Left && last_pressed.is_some() {
989 let last_button = last_pressed.unwrap();
990 let mut handled = false;
991 match wparam.0 as u32 {
992 HTMINBUTTON => {
993 if last_button == HTMINBUTTON {
994 unsafe { ShowWindowAsync(handle, SW_MINIMIZE).ok().log_err() };
995 handled = true;
996 }
997 }
998 HTMAXBUTTON => {
999 if last_button == HTMAXBUTTON {
1000 if state_ptr.state.borrow().is_maximized() {
1001 unsafe { ShowWindowAsync(handle, SW_NORMAL).ok().log_err() };
1002 } else {
1003 unsafe { ShowWindowAsync(handle, SW_MAXIMIZE).ok().log_err() };
1004 }
1005 handled = true;
1006 }
1007 }
1008 HTCLOSE => {
1009 if last_button == HTCLOSE {
1010 unsafe {
1011 PostMessageW(handle, WM_CLOSE, WPARAM::default(), LPARAM::default())
1012 .log_err()
1013 };
1014 handled = true;
1015 }
1016 }
1017 _ => {}
1018 };
1019 if handled {
1020 return Some(0);
1021 }
1022 }
1023
1024 None
1025}
1026
1027fn handle_cursor_changed(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1028 state_ptr.state.borrow_mut().current_cursor = HCURSOR(lparam.0);
1029 Some(0)
1030}
1031
1032fn handle_set_cursor(lparam: LPARAM, state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1033 if matches!(
1034 lparam.loword() as u32,
1035 HTLEFT | HTRIGHT | HTTOP | HTTOPLEFT | HTTOPRIGHT | HTBOTTOM | HTBOTTOMLEFT | HTBOTTOMRIGHT
1036 ) {
1037 return None;
1038 }
1039 unsafe { SetCursor(state_ptr.state.borrow().current_cursor) };
1040 Some(1)
1041}
1042
1043fn handle_system_settings_changed(state_ptr: Rc<WindowsWindowStatePtr>) -> Option<isize> {
1044 let mut lock = state_ptr.state.borrow_mut();
1045 // mouse wheel
1046 lock.system_settings.mouse_wheel_settings.update();
1047 Some(0)
1048}
1049
1050fn parse_syskeydown_msg_keystroke(wparam: WPARAM) -> Option<Keystroke> {
1051 let modifiers = current_modifiers();
1052 if !modifiers.alt {
1053 // on Windows, F10 can trigger this event, not just the alt key
1054 // and we just don't care about F10
1055 return None;
1056 }
1057
1058 let vk_code = wparam.loword();
1059
1060 let key = match VIRTUAL_KEY(vk_code) {
1061 VK_BACK => "backspace",
1062 VK_RETURN => "enter",
1063 VK_TAB => "tab",
1064 VK_UP => "up",
1065 VK_DOWN => "down",
1066 VK_RIGHT => "right",
1067 VK_LEFT => "left",
1068 VK_HOME => "home",
1069 VK_END => "end",
1070 VK_PRIOR => "pageup",
1071 VK_NEXT => "pagedown",
1072 VK_ESCAPE => "escape",
1073 VK_INSERT => "insert",
1074 VK_DELETE => "delete",
1075 _ => return basic_vkcode_to_string(vk_code, modifiers),
1076 }
1077 .to_owned();
1078
1079 Some(Keystroke {
1080 modifiers,
1081 key,
1082 ime_key: None,
1083 })
1084}
1085
1086enum KeystrokeOrModifier {
1087 Keystroke(Keystroke),
1088 Modifier(Modifiers),
1089}
1090
1091fn parse_keydown_msg_keystroke(wparam: WPARAM) -> Option<KeystrokeOrModifier> {
1092 let vk_code = wparam.loword();
1093
1094 let modifiers = current_modifiers();
1095
1096 let key = match VIRTUAL_KEY(vk_code) {
1097 VK_BACK => "backspace",
1098 VK_RETURN => "enter",
1099 VK_TAB => "tab",
1100 VK_UP => "up",
1101 VK_DOWN => "down",
1102 VK_RIGHT => "right",
1103 VK_LEFT => "left",
1104 VK_HOME => "home",
1105 VK_END => "end",
1106 VK_PRIOR => "pageup",
1107 VK_NEXT => "pagedown",
1108 VK_ESCAPE => "escape",
1109 VK_INSERT => "insert",
1110 VK_DELETE => "delete",
1111 _ => {
1112 if is_modifier(VIRTUAL_KEY(vk_code)) {
1113 return Some(KeystrokeOrModifier::Modifier(modifiers));
1114 }
1115
1116 if modifiers.control || modifiers.alt {
1117 let basic_key = basic_vkcode_to_string(vk_code, modifiers);
1118 if let Some(basic_key) = basic_key {
1119 return Some(KeystrokeOrModifier::Keystroke(basic_key));
1120 }
1121 }
1122
1123 if vk_code >= VK_F1.0 && vk_code <= VK_F24.0 {
1124 let offset = vk_code - VK_F1.0;
1125 return Some(KeystrokeOrModifier::Keystroke(Keystroke {
1126 modifiers,
1127 key: format!("f{}", offset + 1),
1128 ime_key: None,
1129 }));
1130 };
1131 return None;
1132 }
1133 }
1134 .to_owned();
1135
1136 Some(KeystrokeOrModifier::Keystroke(Keystroke {
1137 modifiers,
1138 key,
1139 ime_key: None,
1140 }))
1141}
1142
1143fn parse_char_msg_keystroke(wparam: WPARAM) -> Option<Keystroke> {
1144 let first_char = char::from_u32((wparam.0 as u16).into())?;
1145 if first_char.is_control() {
1146 None
1147 } else {
1148 let mut modifiers = current_modifiers();
1149 // for characters that use 'shift' to type it is expected that the
1150 // shift is not reported if the uppercase/lowercase are the same and instead only the key is reported
1151 if first_char.to_ascii_uppercase() == first_char.to_ascii_lowercase() {
1152 modifiers.shift = false;
1153 }
1154 let key = match first_char {
1155 ' ' => "space".to_string(),
1156 first_char => first_char.to_lowercase().to_string(),
1157 };
1158 Some(Keystroke {
1159 modifiers,
1160 key,
1161 ime_key: Some(first_char.to_string()),
1162 })
1163 }
1164}
1165
1166fn parse_ime_compostion_string(handle: HWND) -> Option<(String, usize)> {
1167 unsafe {
1168 let ctx = ImmGetContext(handle);
1169 let string_len = ImmGetCompositionStringW(ctx, GCS_COMPSTR, None, 0);
1170 let result = if string_len >= 0 {
1171 let mut buffer = vec![0u8; string_len as usize + 2];
1172 ImmGetCompositionStringW(
1173 ctx,
1174 GCS_COMPSTR,
1175 Some(buffer.as_mut_ptr() as _),
1176 string_len as _,
1177 );
1178 let wstring = std::slice::from_raw_parts::<u16>(
1179 buffer.as_mut_ptr().cast::<u16>(),
1180 string_len as usize / 2,
1181 );
1182 let string = String::from_utf16_lossy(wstring);
1183 Some((string, string_len as usize / 2))
1184 } else {
1185 None
1186 };
1187 ImmReleaseContext(handle, ctx).ok().log_err();
1188 result
1189 }
1190}
1191
1192fn retrieve_composition_cursor_position(handle: HWND) -> usize {
1193 unsafe {
1194 let ctx = ImmGetContext(handle);
1195 let ret = ImmGetCompositionStringW(ctx, GCS_CURSORPOS, None, 0);
1196 ImmReleaseContext(handle, ctx).ok().log_err();
1197 ret as usize
1198 }
1199}
1200
1201fn parse_ime_compostion_result(handle: HWND) -> Option<String> {
1202 unsafe {
1203 let ctx = ImmGetContext(handle);
1204 let string_len = ImmGetCompositionStringW(ctx, GCS_RESULTSTR, None, 0);
1205 let result = if string_len >= 0 {
1206 let mut buffer = vec![0u8; string_len as usize + 2];
1207 ImmGetCompositionStringW(
1208 ctx,
1209 GCS_RESULTSTR,
1210 Some(buffer.as_mut_ptr() as _),
1211 string_len as _,
1212 );
1213 let wstring = std::slice::from_raw_parts::<u16>(
1214 buffer.as_mut_ptr().cast::<u16>(),
1215 string_len as usize / 2,
1216 );
1217 let string = String::from_utf16_lossy(wstring);
1218 Some(string)
1219 } else {
1220 None
1221 };
1222 ImmReleaseContext(handle, ctx).ok().log_err();
1223 result
1224 }
1225}
1226
1227fn basic_vkcode_to_string(code: u16, modifiers: Modifiers) -> Option<Keystroke> {
1228 let mapped_code = unsafe { MapVirtualKeyW(code as u32, MAPVK_VK_TO_CHAR) };
1229
1230 let key = match mapped_code {
1231 0 => None,
1232 raw_code => char::from_u32(raw_code),
1233 }?
1234 .to_ascii_lowercase();
1235
1236 let key = if matches!(code as u32, 112..=135) {
1237 format!("f{key}")
1238 } else {
1239 key.to_string()
1240 };
1241
1242 Some(Keystroke {
1243 modifiers,
1244 key,
1245 ime_key: None,
1246 })
1247}
1248
1249#[inline]
1250fn is_virtual_key_pressed(vkey: VIRTUAL_KEY) -> bool {
1251 unsafe { GetKeyState(vkey.0 as i32) < 0 }
1252}
1253
1254fn is_modifier(virtual_key: VIRTUAL_KEY) -> bool {
1255 matches!(
1256 virtual_key,
1257 VK_CONTROL | VK_MENU | VK_SHIFT | VK_LWIN | VK_RWIN
1258 )
1259}
1260
1261#[inline]
1262fn current_modifiers() -> Modifiers {
1263 Modifiers {
1264 control: is_virtual_key_pressed(VK_CONTROL),
1265 alt: is_virtual_key_pressed(VK_MENU),
1266 shift: is_virtual_key_pressed(VK_SHIFT),
1267 platform: is_virtual_key_pressed(VK_LWIN) || is_virtual_key_pressed(VK_RWIN),
1268 function: false,
1269 }
1270}