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