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
235impl Drop for Window {
236 fn drop(&mut self) {
237 unsafe {
238 self.0.as_ref().borrow().native_window.close();
239 }
240 }
241}
242
243impl platform::Window for Window {
244 fn on_event(&mut self, callback: Box<dyn FnMut(Event)>) {
245 self.0.as_ref().borrow_mut().event_callback = Some(callback);
246 }
247
248 fn on_resize(&mut self, callback: Box<dyn FnMut(&mut dyn platform::WindowContext)>) {
249 self.0.as_ref().borrow_mut().resize_callback = Some(callback);
250 }
251}
252
253impl platform::WindowContext for Window {
254 fn size(&self) -> Vector2F {
255 self.0.as_ref().borrow().size()
256 }
257
258 fn scale_factor(&self) -> f32 {
259 self.0.as_ref().borrow().scale_factor()
260 }
261
262 fn present_scene(&mut self, scene: Scene) {
263 self.0.as_ref().borrow_mut().present_scene(scene);
264 }
265}
266
267impl platform::WindowContext for WindowState {
268 fn size(&self) -> Vector2F {
269 let NSSize { width, height, .. } =
270 unsafe { NSView::frame(self.native_window.contentView()) }.size;
271 vec2f(width as f32, height as f32)
272 }
273
274 fn scale_factor(&self) -> f32 {
275 unsafe {
276 let screen: id = msg_send![self.native_window, screen];
277 NSScreen::backingScaleFactor(screen) as f32
278 }
279 }
280
281 fn present_scene(&mut self, scene: Scene) {
282 self.scene_to_render = Some(scene);
283 unsafe {
284 let _: () = msg_send![self.native_window.contentView(), setNeedsDisplay: YES];
285 }
286 }
287}
288
289unsafe fn get_window_state(object: &Object) -> Rc<RefCell<WindowState>> {
290 let raw: *mut c_void = *object.get_ivar(WINDOW_STATE_IVAR);
291 let rc1 = Rc::from_raw(raw as *mut RefCell<WindowState>);
292 let rc2 = rc1.clone();
293 mem::forget(rc1);
294 rc2
295}
296
297unsafe fn drop_window_state(object: &Object) {
298 let raw: *mut c_void = *object.get_ivar(WINDOW_STATE_IVAR);
299 Rc::from_raw(raw as *mut WindowState);
300}
301
302extern "C" fn yes(_: &Object, _: Sel) -> BOOL {
303 YES
304}
305
306extern "C" fn dealloc_window(this: &Object, _: Sel) {
307 unsafe {
308 drop_window_state(this);
309 let () = msg_send![super(this, class!(NSWindow)), dealloc];
310 }
311}
312
313extern "C" fn dealloc_view(this: &Object, _: Sel) {
314 unsafe {
315 drop_window_state(this);
316 let () = msg_send![super(this, class!(NSView)), dealloc];
317 }
318}
319
320extern "C" fn handle_view_event(this: &Object, _: Sel, native_event: id) {
321 let window_state = unsafe { get_window_state(this) };
322 let weak_window_state = Rc::downgrade(&window_state);
323 let mut window_state_borrow = window_state.as_ref().borrow_mut();
324
325 let event = unsafe { Event::from_native(native_event, Some(window_state_borrow.size().y())) };
326
327 if let Some(event) = event {
328 match event {
329 Event::LeftMouseDragged { position } => {
330 window_state_borrow.synthetic_drag_counter += 1;
331 window_state_borrow
332 .executor
333 .spawn(synthetic_drag(
334 weak_window_state,
335 window_state_borrow.synthetic_drag_counter,
336 position,
337 ))
338 .detach();
339 }
340 Event::LeftMouseUp { .. } => {
341 window_state_borrow.synthetic_drag_counter += 1;
342 }
343 _ => {}
344 }
345
346 if let Some(mut callback) = window_state_borrow.event_callback.take() {
347 drop(window_state_borrow);
348 callback(event);
349 window_state.borrow_mut().event_callback = Some(callback);
350 }
351 }
352}
353
354extern "C" fn send_event(this: &Object, _: Sel, native_event: id) {
355 unsafe {
356 let () = msg_send![super(this, class!(NSWindow)), sendEvent: native_event];
357 }
358}
359
360extern "C" fn make_backing_layer(this: &Object, _: Sel) -> id {
361 let window_state = unsafe { get_window_state(this) };
362 let window_state = window_state.as_ref().borrow();
363 window_state.layer
364}
365
366extern "C" fn view_did_change_backing_properties(this: &Object, _: Sel) {
367 let window_state = unsafe { get_window_state(this) };
368 let mut window_state = window_state.as_ref().borrow_mut();
369
370 unsafe {
371 let _: () =
372 msg_send![window_state.layer, setContentsScale: window_state.scale_factor() as f64];
373 }
374
375 if let Some(mut callback) = window_state.resize_callback.take() {
376 callback(&mut *window_state);
377 window_state.resize_callback = Some(callback);
378 };
379}
380
381extern "C" fn set_frame_size(this: &Object, _: Sel, size: NSSize) {
382 let window_state = unsafe { get_window_state(this) };
383 let mut window_state = window_state.as_ref().borrow_mut();
384
385 if window_state.size() == vec2f(size.width as f32, size.height as f32) {
386 return;
387 }
388
389 unsafe {
390 let _: () = msg_send![super(this, class!(NSView)), setFrameSize: size];
391 }
392
393 let scale_factor = window_state.scale_factor() as f64;
394 let drawable_size: NSSize = NSSize {
395 width: size.width * scale_factor,
396 height: size.height * scale_factor,
397 };
398
399 unsafe {
400 let _: () = msg_send![window_state.layer, setDrawableSize: drawable_size];
401 }
402
403 if let Some(mut callback) = window_state.resize_callback.take() {
404 callback(&mut *window_state);
405 window_state.resize_callback = Some(callback);
406 };
407}
408
409extern "C" fn display_layer(this: &Object, _: Sel, _: id) {
410 unsafe {
411 let window_state = get_window_state(this);
412 let mut window_state = window_state.as_ref().borrow_mut();
413
414 if let Some(scene) = window_state.scene_to_render.take() {
415 let drawable: &metal::MetalDrawableRef = msg_send![window_state.layer, nextDrawable];
416 let command_queue = window_state.command_queue.clone();
417 let command_buffer = command_queue.new_command_buffer();
418
419 let size = window_state.size();
420 let scale_factor = window_state.scale_factor();
421
422 window_state.renderer.render(
423 &scene,
424 size * scale_factor,
425 command_buffer,
426 drawable.texture(),
427 );
428
429 command_buffer.commit();
430 command_buffer.wait_until_completed();
431 drawable.present();
432 };
433 }
434}
435
436async fn synthetic_drag(
437 window_state: Weak<RefCell<WindowState>>,
438 drag_id: usize,
439 position: Vector2F,
440) {
441 loop {
442 Timer::after(Duration::from_millis(16)).await;
443 if let Some(window_state) = window_state.upgrade() {
444 let mut window_state_borrow = window_state.borrow_mut();
445 if window_state_borrow.synthetic_drag_counter == drag_id {
446 if let Some(mut callback) = window_state_borrow.event_callback.take() {
447 drop(window_state_borrow);
448 callback(Event::LeftMouseDragged { position });
449 window_state.borrow_mut().event_callback = Some(callback);
450 }
451 } else {
452 break;
453 }
454 }
455 }
456}