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