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