1use crate::{
2 executor,
3 geometry::vector::Vector2F,
4 platform::{self, Event, WindowContext},
5 Scene,
6};
7use cocoa::{
8 appkit::{
9 NSApplication, NSBackingStoreBuffered, NSScreen, NSView, NSViewHeightSizable,
10 NSViewWidthSizable, NSWindow, NSWindowStyleMask,
11 },
12 base::{id, nil},
13 foundation::{NSAutoreleasePool, NSInteger, NSSize, NSString},
14 quartzcore::AutoresizingMask,
15};
16use ctor::ctor;
17use foreign_types::ForeignType as _;
18use objc::{
19 class,
20 declare::ClassDecl,
21 msg_send,
22 runtime::{Class, Object, Protocol, Sel, BOOL, NO, YES},
23 sel, sel_impl,
24};
25use pathfinder_geometry::vector::vec2f;
26use smol::Timer;
27use std::{
28 cell::RefCell,
29 ffi::c_void,
30 mem, ptr,
31 rc::{Rc, Weak},
32 sync::Arc,
33 time::Duration,
34};
35
36use super::{geometry::RectFExt, renderer::Renderer};
37
38const WINDOW_STATE_IVAR: &'static str = "windowState";
39
40static mut WINDOW_CLASS: *const Class = ptr::null();
41static mut VIEW_CLASS: *const Class = ptr::null();
42
43#[allow(non_upper_case_globals)]
44const NSViewLayerContentsRedrawDuringViewResize: NSInteger = 2;
45
46#[ctor]
47unsafe fn build_classes() {
48 WINDOW_CLASS = {
49 let mut decl = ClassDecl::new("GPUIWindow", class!(NSWindow)).unwrap();
50 decl.add_ivar::<*mut c_void>(WINDOW_STATE_IVAR);
51 decl.add_method(sel!(dealloc), dealloc_window as extern "C" fn(&Object, Sel));
52 decl.add_method(
53 sel!(canBecomeMainWindow),
54 yes as extern "C" fn(&Object, Sel) -> BOOL,
55 );
56 decl.add_method(
57 sel!(canBecomeKeyWindow),
58 yes as extern "C" fn(&Object, Sel) -> BOOL,
59 );
60 decl.add_method(
61 sel!(sendEvent:),
62 send_event as extern "C" fn(&Object, Sel, id),
63 );
64 decl.add_method(sel!(close), close_window as extern "C" fn(&Object, Sel));
65 decl.register()
66 };
67
68 VIEW_CLASS = {
69 let mut decl = ClassDecl::new("GPUIView", class!(NSView)).unwrap();
70 decl.add_ivar::<*mut c_void>(WINDOW_STATE_IVAR);
71
72 decl.add_method(sel!(dealloc), dealloc_view as extern "C" fn(&Object, Sel));
73
74 decl.add_method(
75 sel!(keyDown:),
76 handle_view_event as extern "C" fn(&Object, Sel, id),
77 );
78 decl.add_method(
79 sel!(mouseDown:),
80 handle_view_event as extern "C" fn(&Object, Sel, id),
81 );
82 decl.add_method(
83 sel!(mouseUp:),
84 handle_view_event as extern "C" fn(&Object, Sel, id),
85 );
86 decl.add_method(
87 sel!(mouseMoved:),
88 handle_view_event as extern "C" fn(&Object, Sel, id),
89 );
90 decl.add_method(
91 sel!(mouseDragged:),
92 handle_view_event as extern "C" fn(&Object, Sel, id),
93 );
94 decl.add_method(
95 sel!(scrollWheel:),
96 handle_view_event as extern "C" fn(&Object, Sel, id),
97 );
98
99 decl.add_method(
100 sel!(makeBackingLayer),
101 make_backing_layer as extern "C" fn(&Object, Sel) -> id,
102 );
103
104 decl.add_protocol(Protocol::get("CALayerDelegate").unwrap());
105 decl.add_method(
106 sel!(viewDidChangeBackingProperties),
107 view_did_change_backing_properties as extern "C" fn(&Object, Sel),
108 );
109 decl.add_method(
110 sel!(setFrameSize:),
111 set_frame_size as extern "C" fn(&Object, Sel, NSSize),
112 );
113 decl.add_method(
114 sel!(displayLayer:),
115 display_layer as extern "C" fn(&Object, Sel, id),
116 );
117
118 decl.register()
119 };
120}
121
122pub struct Window(Rc<RefCell<WindowState>>);
123
124struct WindowState {
125 id: usize,
126 native_window: id,
127 event_callback: Option<Box<dyn FnMut(Event)>>,
128 resize_callback: Option<Box<dyn FnMut(&mut dyn platform::WindowContext)>>,
129 close_callback: Option<Box<dyn FnOnce()>>,
130 synthetic_drag_counter: usize,
131 executor: Rc<executor::Foreground>,
132 scene_to_render: Option<Scene>,
133 renderer: Renderer,
134 command_queue: metal::CommandQueue,
135 layer: id,
136}
137
138impl Window {
139 pub fn open(
140 id: usize,
141 options: platform::WindowOptions,
142 executor: Rc<executor::Foreground>,
143 fonts: Arc<dyn platform::FontSystem>,
144 ) -> Self {
145 const PIXEL_FORMAT: metal::MTLPixelFormat = metal::MTLPixelFormat::BGRA8Unorm;
146
147 unsafe {
148 let pool = NSAutoreleasePool::new(nil);
149
150 let frame = options.bounds.to_ns_rect();
151 let style_mask = NSWindowStyleMask::NSClosableWindowMask
152 | NSWindowStyleMask::NSMiniaturizableWindowMask
153 | NSWindowStyleMask::NSResizableWindowMask
154 | NSWindowStyleMask::NSTitledWindowMask;
155
156 let native_window: id = msg_send![WINDOW_CLASS, alloc];
157 let native_window = native_window.initWithContentRect_styleMask_backing_defer_(
158 frame,
159 style_mask,
160 NSBackingStoreBuffered,
161 NO,
162 );
163 assert!(!native_window.is_null());
164
165 let device =
166 metal::Device::system_default().expect("could not find default metal device");
167
168 let layer: id = msg_send![class!(CAMetalLayer), layer];
169 let _: () = msg_send![layer, setDevice: device.as_ptr()];
170 let _: () = msg_send![layer, setPixelFormat: PIXEL_FORMAT];
171 let _: () = msg_send![layer, setAllowsNextDrawableTimeout: NO];
172 let _: () = msg_send![layer, setNeedsDisplayOnBoundsChange: YES];
173 let _: () = msg_send![layer, setPresentsWithTransaction: YES];
174 let _: () = msg_send![
175 layer,
176 setAutoresizingMask: AutoresizingMask::WIDTH_SIZABLE
177 | AutoresizingMask::HEIGHT_SIZABLE
178 ];
179
180 let native_view: id = msg_send![VIEW_CLASS, alloc];
181 let native_view = NSView::init(native_view);
182 assert!(!native_view.is_null());
183
184 let window = Self(Rc::new(RefCell::new(WindowState {
185 id,
186 native_window,
187 event_callback: None,
188 resize_callback: None,
189 close_callback: None,
190 synthetic_drag_counter: 0,
191 executor,
192 scene_to_render: Default::default(),
193 renderer: Renderer::new(device.clone(), PIXEL_FORMAT, fonts),
194 command_queue: device.new_command_queue(),
195 layer,
196 })));
197
198 (*native_window).set_ivar(
199 WINDOW_STATE_IVAR,
200 Rc::into_raw(window.0.clone()) as *const c_void,
201 );
202 (*native_view).set_ivar(
203 WINDOW_STATE_IVAR,
204 Rc::into_raw(window.0.clone()) as *const c_void,
205 );
206
207 if let Some(title) = options.title.as_ref() {
208 native_window.setTitle_(NSString::alloc(nil).init_str(title));
209 }
210 native_window.setAcceptsMouseMovedEvents_(YES);
211
212 native_view.setAutoresizingMask_(NSViewWidthSizable | NSViewHeightSizable);
213 native_view.setWantsBestResolutionOpenGLSurface_(YES);
214
215 // From winit crate: On Mojave, views automatically become layer-backed shortly after
216 // being added to a native_window. Changing the layer-backedness of a view breaks the
217 // association between the view and its associated OpenGL context. To work around this,
218 // on we explicitly make the view layer-backed up front so that AppKit doesn't do it
219 // itself and break the association with its context.
220 native_view.setWantsLayer(YES);
221 let _: () = msg_send![
222 native_view,
223 setLayerContentsRedrawPolicy: NSViewLayerContentsRedrawDuringViewResize
224 ];
225
226 native_window.setContentView_(native_view.autorelease());
227 native_window.makeFirstResponder_(native_view);
228
229 native_window.center();
230 native_window.makeKeyAndOrderFront_(nil);
231
232 pool.drain();
233
234 window
235 }
236 }
237
238 pub fn key_window_id() -> Option<usize> {
239 unsafe {
240 let app = NSApplication::sharedApplication(nil);
241 let key_window: id = msg_send![app, keyWindow];
242 if key_window.is_null() {
243 None
244 } else {
245 let id = get_window_state(&*key_window).borrow().id;
246 Some(id)
247 }
248 }
249 }
250}
251
252impl Drop for Window {
253 fn drop(&mut self) {
254 unsafe {
255 self.0.as_ref().borrow().native_window.close();
256 }
257 }
258}
259
260impl platform::Window for Window {
261 fn on_event(&mut self, callback: Box<dyn FnMut(Event)>) {
262 self.0.as_ref().borrow_mut().event_callback = Some(callback);
263 }
264
265 fn on_resize(&mut self, callback: Box<dyn FnMut(&mut dyn platform::WindowContext)>) {
266 self.0.as_ref().borrow_mut().resize_callback = Some(callback);
267 }
268
269 fn on_close(&mut self, callback: Box<dyn FnOnce()>) {
270 self.0.as_ref().borrow_mut().close_callback = Some(callback);
271 }
272}
273
274impl platform::WindowContext for Window {
275 fn size(&self) -> Vector2F {
276 self.0.as_ref().borrow().size()
277 }
278
279 fn scale_factor(&self) -> f32 {
280 self.0.as_ref().borrow().scale_factor()
281 }
282
283 fn present_scene(&mut self, scene: Scene) {
284 self.0.as_ref().borrow_mut().present_scene(scene);
285 }
286}
287
288impl platform::WindowContext for WindowState {
289 fn size(&self) -> Vector2F {
290 let NSSize { width, height, .. } =
291 unsafe { NSView::frame(self.native_window.contentView()) }.size;
292 vec2f(width as f32, height as f32)
293 }
294
295 fn scale_factor(&self) -> f32 {
296 unsafe {
297 let screen: id = msg_send![self.native_window, screen];
298 NSScreen::backingScaleFactor(screen) as f32
299 }
300 }
301
302 fn present_scene(&mut self, scene: Scene) {
303 self.scene_to_render = Some(scene);
304 unsafe {
305 let _: () = msg_send![self.native_window.contentView(), setNeedsDisplay: YES];
306 }
307 }
308}
309
310unsafe fn get_window_state(object: &Object) -> Rc<RefCell<WindowState>> {
311 let raw: *mut c_void = *object.get_ivar(WINDOW_STATE_IVAR);
312 let rc1 = Rc::from_raw(raw as *mut RefCell<WindowState>);
313 let rc2 = rc1.clone();
314 mem::forget(rc1);
315 rc2
316}
317
318unsafe fn drop_window_state(object: &Object) {
319 let raw: *mut c_void = *object.get_ivar(WINDOW_STATE_IVAR);
320 Rc::from_raw(raw as *mut RefCell<WindowState>);
321}
322
323extern "C" fn yes(_: &Object, _: Sel) -> BOOL {
324 YES
325}
326
327extern "C" fn dealloc_window(this: &Object, _: Sel) {
328 unsafe {
329 drop_window_state(this);
330 let () = msg_send![super(this, class!(NSWindow)), dealloc];
331 }
332}
333
334extern "C" fn dealloc_view(this: &Object, _: Sel) {
335 unsafe {
336 drop_window_state(this);
337 let () = msg_send![super(this, class!(NSView)), dealloc];
338 }
339}
340
341extern "C" fn handle_view_event(this: &Object, _: Sel, native_event: id) {
342 let window_state = unsafe { get_window_state(this) };
343 let weak_window_state = Rc::downgrade(&window_state);
344 let mut window_state_borrow = window_state.as_ref().borrow_mut();
345
346 let event = unsafe { Event::from_native(native_event, Some(window_state_borrow.size().y())) };
347
348 if let Some(event) = event {
349 match event {
350 Event::LeftMouseDragged { position } => {
351 window_state_borrow.synthetic_drag_counter += 1;
352 window_state_borrow
353 .executor
354 .spawn(synthetic_drag(
355 weak_window_state,
356 window_state_borrow.synthetic_drag_counter,
357 position,
358 ))
359 .detach();
360 }
361 Event::LeftMouseUp { .. } => {
362 window_state_borrow.synthetic_drag_counter += 1;
363 }
364 _ => {}
365 }
366
367 if let Some(mut callback) = window_state_borrow.event_callback.take() {
368 drop(window_state_borrow);
369 callback(event);
370 window_state.borrow_mut().event_callback = Some(callback);
371 }
372 }
373}
374
375extern "C" fn send_event(this: &Object, _: Sel, native_event: id) {
376 unsafe {
377 let () = msg_send![super(this, class!(NSWindow)), sendEvent: native_event];
378 }
379}
380
381extern "C" fn close_window(this: &Object, _: Sel) {
382 unsafe {
383 let window_state = get_window_state(this);
384 let close_callback = window_state
385 .as_ref()
386 .try_borrow_mut()
387 .ok()
388 .and_then(|mut window_state| window_state.close_callback.take());
389 if let Some(callback) = close_callback {
390 callback();
391 }
392
393 let () = msg_send![super(this, class!(NSWindow)), close];
394 }
395}
396
397extern "C" fn make_backing_layer(this: &Object, _: Sel) -> id {
398 let window_state = unsafe { get_window_state(this) };
399 let window_state = window_state.as_ref().borrow();
400 window_state.layer
401}
402
403extern "C" fn view_did_change_backing_properties(this: &Object, _: Sel) {
404 let window_state = unsafe { get_window_state(this) };
405 let mut window_state = window_state.as_ref().borrow_mut();
406
407 unsafe {
408 let _: () =
409 msg_send![window_state.layer, setContentsScale: window_state.scale_factor() as f64];
410 }
411
412 if let Some(mut callback) = window_state.resize_callback.take() {
413 callback(&mut *window_state);
414 window_state.resize_callback = Some(callback);
415 };
416}
417
418extern "C" fn set_frame_size(this: &Object, _: Sel, size: NSSize) {
419 let window_state = unsafe { get_window_state(this) };
420 let mut window_state = window_state.as_ref().borrow_mut();
421
422 if window_state.size() == vec2f(size.width as f32, size.height as f32) {
423 return;
424 }
425
426 unsafe {
427 let _: () = msg_send![super(this, class!(NSView)), setFrameSize: size];
428 }
429
430 let scale_factor = window_state.scale_factor() as f64;
431 let drawable_size: NSSize = NSSize {
432 width: size.width * scale_factor,
433 height: size.height * scale_factor,
434 };
435
436 unsafe {
437 let _: () = msg_send![window_state.layer, setDrawableSize: drawable_size];
438 }
439
440 if let Some(mut callback) = window_state.resize_callback.take() {
441 callback(&mut *window_state);
442 window_state.resize_callback = Some(callback);
443 };
444}
445
446extern "C" fn display_layer(this: &Object, _: Sel, _: id) {
447 unsafe {
448 let window_state = get_window_state(this);
449 let mut window_state = window_state.as_ref().borrow_mut();
450
451 if let Some(scene) = window_state.scene_to_render.take() {
452 let drawable: &metal::MetalDrawableRef = msg_send![window_state.layer, nextDrawable];
453 let command_queue = window_state.command_queue.clone();
454 let command_buffer = command_queue.new_command_buffer();
455
456 let size = window_state.size();
457 let scale_factor = window_state.scale_factor();
458
459 window_state.renderer.render(
460 &scene,
461 size * scale_factor,
462 command_buffer,
463 drawable.texture(),
464 );
465
466 command_buffer.commit();
467 command_buffer.wait_until_completed();
468 drawable.present();
469 };
470 }
471}
472
473async fn synthetic_drag(
474 window_state: Weak<RefCell<WindowState>>,
475 drag_id: usize,
476 position: Vector2F,
477) {
478 loop {
479 Timer::after(Duration::from_millis(16)).await;
480 if let Some(window_state) = window_state.upgrade() {
481 let mut window_state_borrow = window_state.borrow_mut();
482 if window_state_borrow.synthetic_drag_counter == drag_id {
483 if let Some(mut callback) = window_state_borrow.event_callback.take() {
484 drop(window_state_borrow);
485 callback(Event::LeftMouseDragged { position });
486 window_state.borrow_mut().event_callback = Some(callback);
487 }
488 } else {
489 break;
490 }
491 }
492 }
493}