1use crate::{
2 px, AnyView, AppContext, AvailableSpace, Bounds, Context, Effect, Element, EntityId, Handle,
3 LayoutId, MainThread, MainThreadOnly, Pixels, Platform, PlatformWindow, Point, Reference,
4 Scene, Size, StackContext, Style, TaffyLayoutEngine, WeakHandle, WindowOptions,
5};
6use anyhow::Result;
7use derive_more::{Deref, DerefMut};
8use std::{any::TypeId, marker::PhantomData, sync::Arc};
9use util::ResultExt;
10
11pub struct AnyWindow {}
12
13pub struct Window {
14 handle: AnyWindowHandle,
15 platform_window: MainThreadOnly<Box<dyn PlatformWindow>>,
16 rem_size: Pixels,
17 content_size: Size<Pixels>,
18 layout_engine: TaffyLayoutEngine,
19 pub(crate) root_view: Option<AnyView<()>>,
20 mouse_position: Point<Pixels>,
21 pub(crate) scene: Scene,
22 pub(crate) dirty: bool,
23}
24
25impl Window {
26 pub fn new(
27 handle: AnyWindowHandle,
28 options: WindowOptions,
29 cx: &mut AppContext<MainThread>,
30 ) -> Self {
31 let platform_window = cx.platform().open_window(handle, options);
32 let mouse_position = platform_window.mouse_position();
33 let content_size = platform_window.content_size();
34 let scale_factor = platform_window.scale_factor();
35 platform_window.on_resize(Box::new({
36 let handle = handle;
37 let cx = cx.to_async();
38 move |content_size, scale_factor| {
39 cx.update_window(handle, |cx| {
40 cx.window.scene = Scene::new(scale_factor);
41 cx.window.content_size = content_size;
42 cx.window.dirty = true;
43 })
44 .log_err();
45 }
46 }));
47
48 let platform_window =
49 MainThreadOnly::new(Arc::new(platform_window), cx.platform().dispatcher());
50
51 Window {
52 handle,
53 platform_window,
54 rem_size: px(16.),
55 content_size,
56 layout_engine: TaffyLayoutEngine::new(),
57 root_view: None,
58 mouse_position,
59 scene: Scene::new(scale_factor),
60 dirty: true,
61 }
62 }
63}
64
65#[derive(Deref, DerefMut)]
66pub struct WindowContext<'a, 'w, Thread = ()> {
67 thread: PhantomData<Thread>,
68 #[deref]
69 #[deref_mut]
70 app: Reference<'a, AppContext<Thread>>,
71 window: Reference<'w, Window>,
72}
73
74impl<'a, 'w> WindowContext<'a, 'w> {
75 pub(crate) fn mutable(app: &'a mut AppContext, window: &'w mut Window) -> Self {
76 Self {
77 thread: PhantomData,
78 app: Reference::Mutable(app),
79 window: Reference::Mutable(window),
80 }
81 }
82
83 pub(crate) fn draw(&mut self) -> Result<()> {
84 let unit_entity = self.unit_entity.clone();
85 self.update_entity(&unit_entity, |_, cx| {
86 let mut root_view = cx.window.root_view.take().unwrap();
87 let (root_layout_id, mut frame_state) = root_view.layout(&mut (), cx)?;
88 let available_space = cx.window.content_size.map(Into::into);
89 cx.window
90 .layout_engine
91 .compute_layout(root_layout_id, available_space)?;
92 let layout = cx.window.layout_engine.layout(root_layout_id)?;
93 root_view.paint(layout, &mut (), &mut frame_state, cx)?;
94 cx.window.root_view = Some(root_view);
95 let scene = cx.window.scene.take();
96 dbg!(&scene);
97
98 // todo!
99 // self.run_on_main(|cx| {
100 // cx.window
101 // .platform_window
102 // .borrow_on_main_thread()
103 // .draw(scene);
104 // });
105
106 Ok(())
107 })
108 }
109
110 pub fn request_layout(
111 &mut self,
112 style: Style,
113 children: impl IntoIterator<Item = LayoutId>,
114 ) -> Result<LayoutId> {
115 self.app.layout_id_buffer.clear();
116 self.app.layout_id_buffer.extend(children.into_iter());
117 let rem_size = self.rem_size();
118
119 self.window
120 .layout_engine
121 .request_layout(style, rem_size, &self.app.layout_id_buffer)
122 }
123
124 pub fn request_measured_layout<
125 F: Fn(Size<Option<Pixels>>, Size<AvailableSpace>) -> Size<Pixels> + Send + Sync + 'static,
126 >(
127 &mut self,
128 style: Style,
129 rem_size: Pixels,
130 measure: F,
131 ) -> Result<LayoutId> {
132 self.window
133 .layout_engine
134 .request_measured_layout(style, rem_size, measure)
135 }
136
137 pub fn layout(&mut self, layout_id: LayoutId) -> Result<Layout> {
138 Ok(self
139 .window
140 .layout_engine
141 .layout(layout_id)
142 .map(Into::into)?)
143 }
144
145 pub fn rem_size(&self) -> Pixels {
146 self.window.rem_size
147 }
148
149 pub fn mouse_position(&self) -> Point<Pixels> {
150 self.window.mouse_position
151 }
152}
153
154impl WindowContext<'_, '_, MainThread> {
155 // todo!("implement other methods that use platform window")
156 fn platform_window(&self) -> &dyn PlatformWindow {
157 self.window.platform_window.borrow_on_main_thread().as_ref()
158 }
159}
160
161impl Context for WindowContext<'_, '_> {
162 type EntityContext<'a, 'w, T: Send + Sync + 'static> = ViewContext<'a, 'w, T>;
163 type Result<T> = T;
164
165 fn entity<T: Send + Sync + 'static>(
166 &mut self,
167 build_entity: impl FnOnce(&mut Self::EntityContext<'_, '_, T>) -> T,
168 ) -> Handle<T> {
169 let slot = self.entities.reserve();
170 let entity = build_entity(&mut ViewContext::mutable(
171 &mut *self.app,
172 &mut self.window,
173 slot.id,
174 ));
175 self.entities.redeem(slot, entity)
176 }
177
178 fn update_entity<T: Send + Sync + 'static, R>(
179 &mut self,
180 handle: &Handle<T>,
181 update: impl FnOnce(&mut T, &mut Self::EntityContext<'_, '_, T>) -> R,
182 ) -> R {
183 let mut entity = self.entities.lease(handle);
184 let result = update(
185 &mut *entity,
186 &mut ViewContext::mutable(&mut *self.app, &mut *self.window, handle.id),
187 );
188 self.entities.end_lease(entity);
189 result
190 }
191}
192
193impl<S> StackContext for ViewContext<'_, '_, S> {
194 fn app(&mut self) -> &mut AppContext {
195 &mut *self.app
196 }
197
198 fn with_text_style<F, R>(&mut self, style: crate::TextStyleRefinement, f: F) -> R
199 where
200 F: FnOnce(&mut Self) -> R,
201 {
202 self.push_text_style(style);
203 let result = f(self);
204 self.pop_text_style();
205 result
206 }
207
208 fn with_state<T: Send + Sync + 'static, F, R>(&mut self, state: T, f: F) -> R
209 where
210 F: FnOnce(&mut Self) -> R,
211 {
212 self.push_state(state);
213 let result = f(self);
214 self.pop_state::<T>();
215 result
216 }
217}
218
219#[derive(Deref, DerefMut)]
220pub struct ViewContext<'a, 'w, S, Thread = ()> {
221 #[deref]
222 #[deref_mut]
223 window_cx: WindowContext<'a, 'w, Thread>,
224 entity_type: PhantomData<S>,
225 entity_id: EntityId,
226 thread: PhantomData<Thread>,
227}
228
229impl<'a, 'w, S: Send + Sync + 'static> ViewContext<'a, 'w, S> {
230 fn mutable(app: &'a mut AppContext, window: &'w mut Window, entity_id: EntityId) -> Self {
231 Self {
232 window_cx: WindowContext::mutable(app, window),
233 entity_id,
234 entity_type: PhantomData,
235 thread: PhantomData,
236 }
237 }
238
239 pub fn handle(&self) -> WeakHandle<S> {
240 self.entities.weak_handle(self.entity_id)
241 }
242
243 pub fn observe<E: Send + Sync + 'static>(
244 &mut self,
245 handle: &Handle<E>,
246 on_notify: impl Fn(&mut S, Handle<E>, &mut ViewContext<'_, '_, S>) + Send + Sync + 'static,
247 ) {
248 let this = self.handle();
249 let handle = handle.downgrade();
250 let window_handle = self.window.handle;
251 self.app
252 .observers
253 .entry(handle.id)
254 .or_default()
255 .push(Arc::new(move |cx| {
256 cx.update_window(window_handle.id, |cx| {
257 if let Some(handle) = handle.upgrade(cx) {
258 this.update(cx, |this, cx| on_notify(this, handle, cx))
259 .is_ok()
260 } else {
261 false
262 }
263 })
264 .unwrap_or(false)
265 }));
266 }
267
268 pub fn notify(&mut self) {
269 let entity_id = self.entity_id;
270 self.app
271 .pending_effects
272 .push_back(Effect::Notify(entity_id));
273 self.window.dirty = true;
274 }
275
276 pub(crate) fn erase_state<R>(&mut self, f: impl FnOnce(&mut ViewContext<()>) -> R) -> R {
277 let entity_id = self.unit_entity.id;
278 let mut cx = ViewContext::mutable(
279 &mut *self.window_cx.app,
280 &mut *self.window_cx.window,
281 entity_id,
282 );
283 f(&mut cx)
284 }
285}
286
287impl<'a, 'w, S: 'static> Context for ViewContext<'a, 'w, S> {
288 type EntityContext<'b, 'c, U: Send + Sync + 'static> = ViewContext<'b, 'c, U>;
289 type Result<U> = U;
290
291 fn entity<T2: Send + Sync + 'static>(
292 &mut self,
293 build_entity: impl FnOnce(&mut Self::EntityContext<'_, '_, T2>) -> T2,
294 ) -> Handle<T2> {
295 self.window_cx.entity(build_entity)
296 }
297
298 fn update_entity<U: Send + Sync + 'static, R>(
299 &mut self,
300 handle: &Handle<U>,
301 update: impl FnOnce(&mut U, &mut Self::EntityContext<'_, '_, U>) -> R,
302 ) -> R {
303 self.window_cx.update_entity(handle, update)
304 }
305}
306
307impl<S> ViewContext<'_, '_, S, MainThread> {}
308
309// #[derive(Clone, Copy, Eq, PartialEq, Hash)]
310slotmap::new_key_type! { pub struct WindowId; }
311
312#[derive(PartialEq, Eq)]
313pub struct WindowHandle<S> {
314 id: WindowId,
315 state_type: PhantomData<S>,
316}
317
318impl<S> Copy for WindowHandle<S> {}
319
320impl<S> Clone for WindowHandle<S> {
321 fn clone(&self) -> Self {
322 WindowHandle {
323 id: self.id,
324 state_type: PhantomData,
325 }
326 }
327}
328
329impl<S> WindowHandle<S> {
330 pub fn new(id: WindowId) -> Self {
331 WindowHandle {
332 id,
333 state_type: PhantomData,
334 }
335 }
336}
337
338impl<S: 'static> Into<AnyWindowHandle> for WindowHandle<S> {
339 fn into(self) -> AnyWindowHandle {
340 AnyWindowHandle {
341 id: self.id,
342 state_type: TypeId::of::<S>(),
343 }
344 }
345}
346
347#[derive(Copy, Clone, PartialEq, Eq)]
348pub struct AnyWindowHandle {
349 pub(crate) id: WindowId,
350 state_type: TypeId,
351}
352
353#[derive(Clone)]
354pub struct Layout {
355 pub order: u32,
356 pub bounds: Bounds<Pixels>,
357}