1use crate::{
2 executor,
3 geometry::vector::Vector2F,
4 keymap::Keystroke,
5 platform::{self, Event, WindowContext},
6 Scene,
7};
8use block::ConcreteBlock;
9use cocoa::{
10 appkit::{
11 CGPoint, NSApplication, NSBackingStoreBuffered, NSScreen, NSView, NSViewHeightSizable,
12 NSViewWidthSizable, NSWindow, NSWindowButton, NSWindowStyleMask,
13 },
14 base::{id, nil},
15 foundation::{NSAutoreleasePool, NSInteger, NSSize, NSString},
16 quartzcore::AutoresizingMask,
17};
18use core_graphics::display::CGRect;
19use ctor::ctor;
20use foreign_types::ForeignType as _;
21use objc::{
22 class,
23 declare::ClassDecl,
24 msg_send,
25 runtime::{Class, Object, Protocol, Sel, BOOL, NO, YES},
26 sel, sel_impl,
27};
28use pathfinder_geometry::vector::vec2f;
29use smol::Timer;
30use std::{
31 any::Any,
32 cell::{Cell, RefCell},
33 convert::TryInto,
34 ffi::c_void,
35 mem, ptr,
36 rc::{Rc, Weak},
37 sync::Arc,
38 time::Duration,
39};
40
41use super::{geometry::RectFExt, renderer::Renderer};
42
43const WINDOW_STATE_IVAR: &'static str = "windowState";
44
45static mut WINDOW_CLASS: *const Class = ptr::null();
46static mut VIEW_CLASS: *const Class = ptr::null();
47
48#[allow(non_upper_case_globals)]
49const NSViewLayerContentsRedrawDuringViewResize: NSInteger = 2;
50
51#[ctor]
52unsafe fn build_classes() {
53 WINDOW_CLASS = {
54 let mut decl = ClassDecl::new("GPUIWindow", class!(NSWindow)).unwrap();
55 decl.add_ivar::<*mut c_void>(WINDOW_STATE_IVAR);
56 decl.add_method(sel!(dealloc), dealloc_window as extern "C" fn(&Object, Sel));
57 decl.add_method(
58 sel!(canBecomeMainWindow),
59 yes as extern "C" fn(&Object, Sel) -> BOOL,
60 );
61 decl.add_method(
62 sel!(canBecomeKeyWindow),
63 yes as extern "C" fn(&Object, Sel) -> BOOL,
64 );
65 decl.add_method(
66 sel!(sendEvent:),
67 send_event as extern "C" fn(&Object, Sel, id),
68 );
69 decl.add_method(
70 sel!(windowDidResize:),
71 window_did_resize as extern "C" fn(&Object, Sel, id),
72 );
73 decl.add_method(sel!(close), close_window as extern "C" fn(&Object, Sel));
74 decl.register()
75 };
76
77 VIEW_CLASS = {
78 let mut decl = ClassDecl::new("GPUIView", class!(NSView)).unwrap();
79 decl.add_ivar::<*mut c_void>(WINDOW_STATE_IVAR);
80
81 decl.add_method(sel!(dealloc), dealloc_view as extern "C" fn(&Object, Sel));
82
83 decl.add_method(
84 sel!(keyDown:),
85 handle_view_event as extern "C" fn(&Object, Sel, id),
86 );
87 decl.add_method(
88 sel!(mouseDown:),
89 handle_view_event as extern "C" fn(&Object, Sel, id),
90 );
91 decl.add_method(
92 sel!(mouseUp:),
93 handle_view_event as extern "C" fn(&Object, Sel, id),
94 );
95 decl.add_method(
96 sel!(mouseMoved:),
97 handle_view_event as extern "C" fn(&Object, Sel, id),
98 );
99 decl.add_method(
100 sel!(mouseDragged:),
101 handle_view_event as extern "C" fn(&Object, Sel, id),
102 );
103 decl.add_method(
104 sel!(scrollWheel:),
105 handle_view_event as extern "C" fn(&Object, Sel, id),
106 );
107
108 decl.add_method(
109 sel!(makeBackingLayer),
110 make_backing_layer as extern "C" fn(&Object, Sel) -> id,
111 );
112
113 decl.add_protocol(Protocol::get("CALayerDelegate").unwrap());
114 decl.add_method(
115 sel!(viewDidChangeBackingProperties),
116 view_did_change_backing_properties as extern "C" fn(&Object, Sel),
117 );
118 decl.add_method(
119 sel!(setFrameSize:),
120 set_frame_size as extern "C" fn(&Object, Sel, NSSize),
121 );
122 decl.add_method(
123 sel!(displayLayer:),
124 display_layer as extern "C" fn(&Object, Sel, id),
125 );
126
127 decl.register()
128 };
129}
130
131pub struct Window(Rc<RefCell<WindowState>>);
132
133struct WindowState {
134 id: usize,
135 native_window: id,
136 event_callback: Option<Box<dyn FnMut(Event)>>,
137 resize_callback: Option<Box<dyn FnMut()>>,
138 close_callback: Option<Box<dyn FnOnce()>>,
139 synthetic_drag_counter: usize,
140 executor: Rc<executor::Foreground>,
141 scene_to_render: Option<Scene>,
142 renderer: Renderer,
143 command_queue: metal::CommandQueue,
144 last_fresh_keydown: Option<(Keystroke, String)>,
145 layer: id,
146 traffic_light_position: Option<Vector2F>,
147}
148
149impl Window {
150 pub fn open(
151 id: usize,
152 options: platform::WindowOptions,
153 executor: Rc<executor::Foreground>,
154 fonts: Arc<dyn platform::FontSystem>,
155 ) -> Self {
156 const PIXEL_FORMAT: metal::MTLPixelFormat = metal::MTLPixelFormat::BGRA8Unorm;
157
158 unsafe {
159 let pool = NSAutoreleasePool::new(nil);
160
161 let frame = options.bounds.to_ns_rect();
162 let mut style_mask = NSWindowStyleMask::NSClosableWindowMask
163 | NSWindowStyleMask::NSMiniaturizableWindowMask
164 | NSWindowStyleMask::NSResizableWindowMask
165 | NSWindowStyleMask::NSTitledWindowMask;
166
167 if options.titlebar_appears_transparent {
168 style_mask |= NSWindowStyleMask::NSFullSizeContentViewWindowMask;
169 }
170
171 let native_window: id = msg_send![WINDOW_CLASS, alloc];
172 let native_window = native_window.initWithContentRect_styleMask_backing_defer_(
173 frame,
174 style_mask,
175 NSBackingStoreBuffered,
176 NO,
177 );
178 assert!(!native_window.is_null());
179
180 let device =
181 metal::Device::system_default().expect("could not find default metal device");
182
183 let layer: id = msg_send![class!(CAMetalLayer), layer];
184 let _: () = msg_send![layer, setDevice: device.as_ptr()];
185 let _: () = msg_send![layer, setPixelFormat: PIXEL_FORMAT];
186 let _: () = msg_send![layer, setAllowsNextDrawableTimeout: NO];
187 let _: () = msg_send![layer, setNeedsDisplayOnBoundsChange: YES];
188 let _: () = msg_send![layer, setPresentsWithTransaction: YES];
189 let _: () = msg_send![
190 layer,
191 setAutoresizingMask: AutoresizingMask::WIDTH_SIZABLE
192 | AutoresizingMask::HEIGHT_SIZABLE
193 ];
194
195 let native_view: id = msg_send![VIEW_CLASS, alloc];
196 let native_view = NSView::init(native_view);
197 assert!(!native_view.is_null());
198
199 let window = Self(Rc::new(RefCell::new(WindowState {
200 id,
201 native_window,
202 event_callback: None,
203 resize_callback: None,
204 close_callback: None,
205 synthetic_drag_counter: 0,
206 executor,
207 scene_to_render: Default::default(),
208 renderer: Renderer::new(device.clone(), PIXEL_FORMAT, fonts),
209 command_queue: device.new_command_queue(),
210 last_fresh_keydown: None,
211 layer,
212 traffic_light_position: options.traffic_light_position,
213 })));
214
215 (*native_window).set_ivar(
216 WINDOW_STATE_IVAR,
217 Rc::into_raw(window.0.clone()) as *const c_void,
218 );
219 native_window.setDelegate_(native_window);
220 (*native_view).set_ivar(
221 WINDOW_STATE_IVAR,
222 Rc::into_raw(window.0.clone()) as *const c_void,
223 );
224
225 if let Some(title) = options.title.as_ref() {
226 native_window.setTitle_(NSString::alloc(nil).init_str(title));
227 }
228 if options.titlebar_appears_transparent {
229 native_window.setTitlebarAppearsTransparent_(YES);
230 }
231 native_window.setAcceptsMouseMovedEvents_(YES);
232
233 native_view.setAutoresizingMask_(NSViewWidthSizable | NSViewHeightSizable);
234 native_view.setWantsBestResolutionOpenGLSurface_(YES);
235
236 // From winit crate: On Mojave, views automatically become layer-backed shortly after
237 // being added to a native_window. Changing the layer-backedness of a view breaks the
238 // association between the view and its associated OpenGL context. To work around this,
239 // on we explicitly make the view layer-backed up front so that AppKit doesn't do it
240 // itself and break the association with its context.
241 native_view.setWantsLayer(YES);
242 let _: () = msg_send![
243 native_view,
244 setLayerContentsRedrawPolicy: NSViewLayerContentsRedrawDuringViewResize
245 ];
246
247 native_window.setContentView_(native_view.autorelease());
248 native_window.makeFirstResponder_(native_view);
249
250 native_window.center();
251 native_window.makeKeyAndOrderFront_(nil);
252
253 window.0.borrow().move_traffic_light();
254 pool.drain();
255
256 window
257 }
258 }
259
260 pub fn key_window_id() -> Option<usize> {
261 unsafe {
262 let app = NSApplication::sharedApplication(nil);
263 let key_window: id = msg_send![app, keyWindow];
264 if msg_send![key_window, isKindOfClass: WINDOW_CLASS] {
265 let id = get_window_state(&*key_window).borrow().id;
266 Some(id)
267 } else {
268 None
269 }
270 }
271 }
272}
273
274impl Drop for Window {
275 fn drop(&mut self) {
276 unsafe {
277 self.0.as_ref().borrow().native_window.close();
278 }
279 }
280}
281
282impl platform::Window for Window {
283 fn as_any_mut(&mut self) -> &mut dyn Any {
284 self
285 }
286
287 fn on_event(&mut self, callback: Box<dyn FnMut(Event)>) {
288 self.0.as_ref().borrow_mut().event_callback = Some(callback);
289 }
290
291 fn on_resize(&mut self, callback: Box<dyn FnMut()>) {
292 self.0.as_ref().borrow_mut().resize_callback = Some(callback);
293 }
294
295 fn on_close(&mut self, callback: Box<dyn FnOnce()>) {
296 self.0.as_ref().borrow_mut().close_callback = Some(callback);
297 }
298
299 fn prompt(
300 &self,
301 level: platform::PromptLevel,
302 msg: &str,
303 answers: &[&str],
304 done_fn: Box<dyn FnOnce(usize)>,
305 ) {
306 unsafe {
307 let alert: id = msg_send![class!(NSAlert), alloc];
308 let alert: id = msg_send![alert, init];
309 let alert_style = match level {
310 platform::PromptLevel::Info => 1,
311 platform::PromptLevel::Warning => 0,
312 platform::PromptLevel::Critical => 2,
313 };
314 let _: () = msg_send![alert, setAlertStyle: alert_style];
315 let _: () = msg_send![alert, setMessageText: ns_string(msg)];
316 for (ix, answer) in answers.into_iter().enumerate() {
317 let button: id = msg_send![alert, addButtonWithTitle: ns_string(answer)];
318 let _: () = msg_send![button, setTag: ix as NSInteger];
319 }
320 let done_fn = Cell::new(Some(done_fn));
321 let block = ConcreteBlock::new(move |answer: NSInteger| {
322 if let Some(done_fn) = done_fn.take() {
323 (done_fn)(answer.try_into().unwrap());
324 }
325 });
326 let block = block.copy();
327 let _: () = msg_send![
328 alert,
329 beginSheetModalForWindow: self.0.borrow().native_window
330 completionHandler: block
331 ];
332 }
333 }
334}
335
336impl platform::WindowContext for Window {
337 fn size(&self) -> Vector2F {
338 self.0.as_ref().borrow().size()
339 }
340
341 fn scale_factor(&self) -> f32 {
342 self.0.as_ref().borrow().scale_factor()
343 }
344
345 fn present_scene(&mut self, scene: Scene) {
346 self.0.as_ref().borrow_mut().present_scene(scene);
347 }
348
349 fn titlebar_height(&self) -> f32 {
350 self.0.as_ref().borrow().titlebar_height()
351 }
352}
353
354impl WindowState {
355 fn move_traffic_light(&self) {
356 if let Some(traffic_light_position) = self.traffic_light_position {
357 let titlebar_height = self.titlebar_height();
358
359 unsafe {
360 let close_button: id = msg_send![
361 self.native_window,
362 standardWindowButton: NSWindowButton::NSWindowCloseButton
363 ];
364 let min_button: id = msg_send![
365 self.native_window,
366 standardWindowButton: NSWindowButton::NSWindowMiniaturizeButton
367 ];
368 let zoom_button: id = msg_send![
369 self.native_window,
370 standardWindowButton: NSWindowButton::NSWindowZoomButton
371 ];
372
373 let mut close_button_frame: CGRect = msg_send![close_button, frame];
374 let mut min_button_frame: CGRect = msg_send![min_button, frame];
375 let mut zoom_button_frame: CGRect = msg_send![zoom_button, frame];
376 let mut origin = vec2f(
377 traffic_light_position.x(),
378 titlebar_height
379 - traffic_light_position.y()
380 - close_button_frame.size.height as f32,
381 );
382 let button_spacing =
383 (min_button_frame.origin.x - close_button_frame.origin.x) as f32;
384
385 close_button_frame.origin = CGPoint::new(origin.x() as f64, origin.y() as f64);
386 let _: () = msg_send![close_button, setFrame: close_button_frame];
387 origin.set_x(origin.x() + button_spacing);
388
389 min_button_frame.origin = CGPoint::new(origin.x() as f64, origin.y() as f64);
390 let _: () = msg_send![min_button, setFrame: min_button_frame];
391 origin.set_x(origin.x() + button_spacing);
392
393 zoom_button_frame.origin = CGPoint::new(origin.x() as f64, origin.y() as f64);
394 let _: () = msg_send![zoom_button, setFrame: zoom_button_frame];
395 }
396 }
397 }
398}
399
400impl platform::WindowContext for WindowState {
401 fn size(&self) -> Vector2F {
402 let NSSize { width, height, .. } =
403 unsafe { NSView::frame(self.native_window.contentView()) }.size;
404 vec2f(width as f32, height as f32)
405 }
406
407 fn scale_factor(&self) -> f32 {
408 unsafe {
409 let screen: id = msg_send![self.native_window, screen];
410 NSScreen::backingScaleFactor(screen) as f32
411 }
412 }
413
414 fn titlebar_height(&self) -> f32 {
415 unsafe {
416 let frame = NSWindow::frame(self.native_window);
417 let content_layout_rect: CGRect = msg_send![self.native_window, contentLayoutRect];
418 (frame.size.height - content_layout_rect.size.height) as f32
419 }
420 }
421
422 fn present_scene(&mut self, scene: Scene) {
423 self.scene_to_render = Some(scene);
424 unsafe {
425 let _: () = msg_send![self.native_window.contentView(), setNeedsDisplay: YES];
426 }
427 }
428}
429
430unsafe fn get_window_state(object: &Object) -> Rc<RefCell<WindowState>> {
431 let raw: *mut c_void = *object.get_ivar(WINDOW_STATE_IVAR);
432 let rc1 = Rc::from_raw(raw as *mut RefCell<WindowState>);
433 let rc2 = rc1.clone();
434 mem::forget(rc1);
435 rc2
436}
437
438unsafe fn drop_window_state(object: &Object) {
439 let raw: *mut c_void = *object.get_ivar(WINDOW_STATE_IVAR);
440 Rc::from_raw(raw as *mut RefCell<WindowState>);
441}
442
443extern "C" fn yes(_: &Object, _: Sel) -> BOOL {
444 YES
445}
446
447extern "C" fn dealloc_window(this: &Object, _: Sel) {
448 unsafe {
449 drop_window_state(this);
450 let () = msg_send![super(this, class!(NSWindow)), dealloc];
451 }
452}
453
454extern "C" fn dealloc_view(this: &Object, _: Sel) {
455 unsafe {
456 drop_window_state(this);
457 let () = msg_send![super(this, class!(NSView)), dealloc];
458 }
459}
460
461extern "C" fn handle_view_event(this: &Object, _: Sel, native_event: id) {
462 let window_state = unsafe { get_window_state(this) };
463 let weak_window_state = Rc::downgrade(&window_state);
464 let mut window_state_borrow = window_state.as_ref().borrow_mut();
465
466 let event = unsafe { Event::from_native(native_event, Some(window_state_borrow.size().y())) };
467
468 if let Some(event) = event {
469 match &event {
470 Event::LeftMouseDragged { position } => {
471 window_state_borrow.synthetic_drag_counter += 1;
472 window_state_borrow
473 .executor
474 .spawn(synthetic_drag(
475 weak_window_state,
476 window_state_borrow.synthetic_drag_counter,
477 *position,
478 ))
479 .detach();
480 }
481 Event::LeftMouseUp { .. } => {
482 window_state_borrow.synthetic_drag_counter += 1;
483 }
484
485 // Ignore events from held-down keys after some of the initially-pressed keys
486 // were released.
487 Event::KeyDown {
488 chars,
489 keystroke,
490 is_held,
491 } => {
492 let keydown = (keystroke.clone(), chars.clone());
493 if *is_held {
494 if window_state_borrow.last_fresh_keydown.as_ref() != Some(&keydown) {
495 return;
496 }
497 } else {
498 window_state_borrow.last_fresh_keydown = Some(keydown);
499 }
500 }
501
502 _ => {}
503 }
504
505 if let Some(mut callback) = window_state_borrow.event_callback.take() {
506 drop(window_state_borrow);
507 callback(event);
508 window_state.borrow_mut().event_callback = Some(callback);
509 }
510 }
511}
512
513extern "C" fn send_event(this: &Object, _: Sel, native_event: id) {
514 unsafe {
515 let () = msg_send![super(this, class!(NSWindow)), sendEvent: native_event];
516 }
517}
518
519extern "C" fn window_did_resize(this: &Object, _: Sel, _: id) {
520 let window_state = unsafe { get_window_state(this) };
521 window_state.as_ref().borrow().move_traffic_light();
522}
523
524extern "C" fn close_window(this: &Object, _: Sel) {
525 unsafe {
526 let close_callback = {
527 let window_state = get_window_state(this);
528 window_state
529 .as_ref()
530 .try_borrow_mut()
531 .ok()
532 .and_then(|mut window_state| window_state.close_callback.take())
533 };
534
535 if let Some(callback) = close_callback {
536 callback();
537 }
538
539 let () = msg_send![super(this, class!(NSWindow)), close];
540 }
541}
542
543extern "C" fn make_backing_layer(this: &Object, _: Sel) -> id {
544 let window_state = unsafe { get_window_state(this) };
545 let window_state = window_state.as_ref().borrow();
546 window_state.layer
547}
548
549extern "C" fn view_did_change_backing_properties(this: &Object, _: Sel) {
550 let window_state = unsafe { get_window_state(this) };
551 let mut window_state_borrow = window_state.as_ref().borrow_mut();
552
553 unsafe {
554 let _: () = msg_send![window_state_borrow.layer, setContentsScale: window_state_borrow.scale_factor() as f64];
555 }
556
557 if let Some(mut callback) = window_state_borrow.resize_callback.take() {
558 drop(window_state_borrow);
559 callback();
560 window_state.as_ref().borrow_mut().resize_callback = Some(callback);
561 };
562}
563
564extern "C" fn set_frame_size(this: &Object, _: Sel, size: NSSize) {
565 let window_state = unsafe { get_window_state(this) };
566 let mut window_state_borrow = window_state.as_ref().borrow_mut();
567
568 if window_state_borrow.size() == vec2f(size.width as f32, size.height as f32) {
569 return;
570 }
571
572 unsafe {
573 let _: () = msg_send![super(this, class!(NSView)), setFrameSize: size];
574 }
575
576 let scale_factor = window_state_borrow.scale_factor() as f64;
577 let drawable_size: NSSize = NSSize {
578 width: size.width * scale_factor,
579 height: size.height * scale_factor,
580 };
581
582 unsafe {
583 let _: () = msg_send![window_state_borrow.layer, setDrawableSize: drawable_size];
584 }
585
586 if let Some(mut callback) = window_state_borrow.resize_callback.take() {
587 drop(window_state_borrow);
588 callback();
589 window_state.borrow_mut().resize_callback = Some(callback);
590 };
591}
592
593extern "C" fn display_layer(this: &Object, _: Sel, _: id) {
594 unsafe {
595 let window_state = get_window_state(this);
596 let mut window_state = window_state.as_ref().borrow_mut();
597
598 if let Some(scene) = window_state.scene_to_render.take() {
599 let drawable: &metal::MetalDrawableRef = msg_send![window_state.layer, nextDrawable];
600 let command_queue = window_state.command_queue.clone();
601 let command_buffer = command_queue.new_command_buffer();
602
603 let size = window_state.size();
604 let scale_factor = window_state.scale_factor();
605
606 window_state.renderer.render(
607 &scene,
608 size * scale_factor,
609 command_buffer,
610 drawable.texture(),
611 );
612
613 command_buffer.commit();
614 command_buffer.wait_until_completed();
615 drawable.present();
616 };
617 }
618}
619
620async fn synthetic_drag(
621 window_state: Weak<RefCell<WindowState>>,
622 drag_id: usize,
623 position: Vector2F,
624) {
625 loop {
626 Timer::after(Duration::from_millis(16)).await;
627 if let Some(window_state) = window_state.upgrade() {
628 let mut window_state_borrow = window_state.borrow_mut();
629 if window_state_borrow.synthetic_drag_counter == drag_id {
630 if let Some(mut callback) = window_state_borrow.event_callback.take() {
631 drop(window_state_borrow);
632 callback(Event::LeftMouseDragged { position });
633 window_state.borrow_mut().event_callback = Some(callback);
634 }
635 } else {
636 break;
637 }
638 }
639 }
640}
641
642unsafe fn ns_string(string: &str) -> id {
643 NSString::alloc(nil).init_str(string).autorelease()
644}