1use crate::{
2 app::{AppContext, MutableAppContext, WindowInvalidation},
3 elements::Element,
4 fonts::FontCache,
5 platform::Event,
6 text_layout::TextLayoutCache,
7 AssetCache, Scene,
8};
9use pathfinder_geometry::vector::{vec2f, Vector2F};
10use std::{any::Any, collections::HashMap, sync::Arc};
11
12pub struct Presenter {
13 window_id: usize,
14 rendered_views: HashMap<usize, Box<dyn Element>>,
15 parents: HashMap<usize, usize>,
16 font_cache: Arc<FontCache>,
17 text_layout_cache: TextLayoutCache,
18 asset_cache: Arc<AssetCache>,
19}
20
21impl Presenter {
22 pub fn new(
23 window_id: usize,
24 font_cache: Arc<FontCache>,
25 asset_cache: Arc<AssetCache>,
26 app: &MutableAppContext,
27 ) -> Self {
28 Self {
29 window_id,
30 rendered_views: app.render_views(window_id).unwrap(),
31 parents: HashMap::new(),
32 font_cache,
33 text_layout_cache: TextLayoutCache::new(),
34 asset_cache,
35 }
36 }
37
38 pub fn dispatch_path(&self, app: &AppContext) -> Vec<usize> {
39 let mut view_id = app.focused_view_id(self.window_id).unwrap();
40 let mut path = vec![view_id];
41 while let Some(parent_id) = self.parents.get(&view_id).copied() {
42 path.push(parent_id);
43 view_id = parent_id;
44 }
45 path.reverse();
46 path
47 }
48
49 pub fn invalidate(&mut self, invalidation: WindowInvalidation, app: &AppContext) {
50 for view_id in invalidation.updated {
51 self.rendered_views
52 .insert(view_id, app.render_view(self.window_id, view_id).unwrap());
53 }
54 for view_id in invalidation.removed {
55 self.rendered_views.remove(&view_id);
56 self.parents.remove(&view_id);
57 }
58 }
59
60 pub fn build_scene(
61 &mut self,
62 window_size: Vector2F,
63 scale_factor: f32,
64 app: &mut MutableAppContext,
65 ) -> Scene {
66 let mut scene = Scene::new(scale_factor);
67
68 if let Some(root_view_id) = app.root_view_id(self.window_id) {
69 self.layout(window_size, app.downgrade());
70 self.after_layout(app);
71 let mut paint_ctx = PaintContext {
72 scene: &mut scene,
73 font_cache: &self.font_cache,
74 text_layout_cache: &self.text_layout_cache,
75 rendered_views: &mut self.rendered_views,
76 };
77 paint_ctx.paint(root_view_id, Vector2F::zero(), app.downgrade());
78 self.text_layout_cache.finish_frame();
79 } else {
80 log::error!("could not find root_view_id for window {}", self.window_id);
81 }
82
83 scene
84 }
85
86 fn layout(&mut self, size: Vector2F, app: &AppContext) {
87 if let Some(root_view_id) = app.root_view_id(self.window_id) {
88 let mut layout_ctx = LayoutContext {
89 rendered_views: &mut self.rendered_views,
90 parents: &mut self.parents,
91 font_cache: &self.font_cache,
92 text_layout_cache: &self.text_layout_cache,
93 asset_cache: &self.asset_cache,
94 view_stack: Vec::new(),
95 };
96 layout_ctx.layout(root_view_id, SizeConstraint::strict(size), app);
97 }
98 }
99
100 fn after_layout(&mut self, app: &mut MutableAppContext) {
101 if let Some(root_view_id) = app.root_view_id(self.window_id) {
102 let mut ctx = AfterLayoutContext {
103 rendered_views: &mut self.rendered_views,
104 font_cache: &self.font_cache,
105 text_layout_cache: &self.text_layout_cache,
106 };
107 ctx.after_layout(root_view_id, app);
108 }
109 }
110
111 pub fn responder_chain(&self, app: &AppContext) -> Option<Vec<usize>> {
112 app.focused_view_id(self.window_id).map(|mut view_id| {
113 let mut chain = vec![view_id];
114 while let Some(parent_id) = self.parents.get(&view_id) {
115 view_id = *parent_id;
116 chain.push(view_id);
117 }
118 chain.reverse();
119 chain
120 })
121 }
122
123 pub fn dispatch_event(&self, event: Event, app: &AppContext) -> Vec<ActionToDispatch> {
124 let mut event_ctx = EventContext {
125 rendered_views: &self.rendered_views,
126 actions: Vec::new(),
127 font_cache: &self.font_cache,
128 text_layout_cache: &self.text_layout_cache,
129 view_stack: Vec::new(),
130 };
131 if let Some(root_view_id) = app.root_view_id(self.window_id) {
132 event_ctx.dispatch_event_on_view(root_view_id, &event, app);
133 }
134 event_ctx.actions
135 }
136}
137
138pub struct ActionToDispatch {
139 pub path: Vec<usize>,
140 pub name: &'static str,
141 pub arg: Box<dyn Any>,
142}
143
144pub struct LayoutContext<'a> {
145 rendered_views: &'a mut HashMap<usize, Box<dyn Element>>,
146 parents: &'a mut HashMap<usize, usize>,
147 pub font_cache: &'a FontCache,
148 pub text_layout_cache: &'a TextLayoutCache,
149 pub asset_cache: &'a AssetCache,
150 view_stack: Vec<usize>,
151}
152
153impl<'a> LayoutContext<'a> {
154 fn layout(&mut self, view_id: usize, constraint: SizeConstraint, app: &AppContext) -> Vector2F {
155 if let Some(parent_id) = self.view_stack.last() {
156 self.parents.insert(view_id, *parent_id);
157 }
158 self.view_stack.push(view_id);
159 let mut rendered_view = self.rendered_views.remove(&view_id).unwrap();
160 let size = rendered_view.layout(constraint, self, app);
161 self.rendered_views.insert(view_id, rendered_view);
162 self.view_stack.pop();
163 size
164 }
165}
166
167pub struct AfterLayoutContext<'a> {
168 rendered_views: &'a mut HashMap<usize, Box<dyn Element>>,
169 pub font_cache: &'a FontCache,
170 pub text_layout_cache: &'a TextLayoutCache,
171}
172
173impl<'a> AfterLayoutContext<'a> {
174 fn after_layout(&mut self, view_id: usize, app: &mut MutableAppContext) {
175 if let Some(mut view) = self.rendered_views.remove(&view_id) {
176 view.after_layout(self, app);
177 self.rendered_views.insert(view_id, view);
178 }
179 }
180}
181
182pub struct PaintContext<'a> {
183 rendered_views: &'a mut HashMap<usize, Box<dyn Element>>,
184 pub scene: &'a mut Scene,
185 pub font_cache: &'a FontCache,
186 pub text_layout_cache: &'a TextLayoutCache,
187}
188
189impl<'a> PaintContext<'a> {
190 fn paint(&mut self, view_id: usize, origin: Vector2F, app: &AppContext) {
191 if let Some(mut tree) = self.rendered_views.remove(&view_id) {
192 tree.paint(origin, self, app);
193 self.rendered_views.insert(view_id, tree);
194 }
195 }
196}
197
198pub struct EventContext<'a> {
199 rendered_views: &'a HashMap<usize, Box<dyn Element>>,
200 actions: Vec<ActionToDispatch>,
201 pub font_cache: &'a FontCache,
202 pub text_layout_cache: &'a TextLayoutCache,
203 view_stack: Vec<usize>,
204}
205
206impl<'a> EventContext<'a> {
207 pub fn dispatch_event_on_view(
208 &mut self,
209 view_id: usize,
210 event: &Event,
211 app: &AppContext,
212 ) -> bool {
213 if let Some(element) = self.rendered_views.get(&view_id) {
214 self.view_stack.push(view_id);
215 let result = element.dispatch_event(event, self, app);
216 self.view_stack.pop();
217 result
218 } else {
219 false
220 }
221 }
222
223 pub fn dispatch_action<A: 'static + Any>(&mut self, name: &'static str, arg: A) {
224 self.actions.push(ActionToDispatch {
225 path: self.view_stack.clone(),
226 name,
227 arg: Box::new(arg),
228 });
229 }
230}
231
232#[derive(Clone, Copy, Debug, Eq, PartialEq)]
233pub enum Axis {
234 Horizontal,
235 Vertical,
236}
237
238impl Axis {
239 pub fn invert(self) -> Self {
240 match self {
241 Self::Horizontal => Self::Vertical,
242 Self::Vertical => Self::Horizontal,
243 }
244 }
245}
246
247pub trait Vector2FExt {
248 fn along(self, axis: Axis) -> f32;
249}
250
251impl Vector2FExt for Vector2F {
252 fn along(self, axis: Axis) -> f32 {
253 match axis {
254 Axis::Horizontal => self.x(),
255 Axis::Vertical => self.y(),
256 }
257 }
258}
259
260#[derive(Copy, Clone, Debug)]
261pub struct SizeConstraint {
262 pub min: Vector2F,
263 pub max: Vector2F,
264}
265
266impl SizeConstraint {
267 pub fn new(min: Vector2F, max: Vector2F) -> Self {
268 Self { min, max }
269 }
270
271 pub fn strict(size: Vector2F) -> Self {
272 Self {
273 min: size,
274 max: size,
275 }
276 }
277
278 pub fn strict_along(axis: Axis, max: f32) -> Self {
279 match axis {
280 Axis::Horizontal => Self {
281 min: vec2f(max, 0.0),
282 max: vec2f(max, f32::INFINITY),
283 },
284 Axis::Vertical => Self {
285 min: vec2f(0.0, max),
286 max: vec2f(f32::INFINITY, max),
287 },
288 }
289 }
290
291 pub fn max_along(&self, axis: Axis) -> f32 {
292 match axis {
293 Axis::Horizontal => self.max.x(),
294 Axis::Vertical => self.max.y(),
295 }
296 }
297}
298
299pub struct ChildView {
300 view_id: usize,
301 size: Option<Vector2F>,
302 origin: Option<Vector2F>,
303}
304
305impl ChildView {
306 pub fn new(view_id: usize) -> Self {
307 Self {
308 view_id,
309 size: None,
310 origin: None,
311 }
312 }
313}
314
315impl Element for ChildView {
316 fn layout(
317 &mut self,
318 constraint: SizeConstraint,
319 ctx: &mut LayoutContext,
320 app: &AppContext,
321 ) -> Vector2F {
322 let size = ctx.layout(self.view_id, constraint, app);
323 self.size = Some(size);
324 size
325 }
326
327 fn after_layout(&mut self, ctx: &mut AfterLayoutContext, app: &mut MutableAppContext) {
328 ctx.after_layout(self.view_id, app);
329 }
330
331 fn paint(&mut self, origin: Vector2F, ctx: &mut PaintContext, app: &AppContext) {
332 self.origin = Some(origin);
333 ctx.paint(self.view_id, origin, app);
334 }
335
336 fn dispatch_event(&self, event: &Event, ctx: &mut EventContext, app: &AppContext) -> bool {
337 ctx.dispatch_event_on_view(self.view_id, event, app)
338 }
339
340 fn size(&self) -> Option<Vector2F> {
341 self.size
342 }
343}
344
345#[cfg(test)]
346mod tests {
347 // #[test]
348 // fn test_responder_chain() {
349 // let settings = settings_rx(None);
350 // let mut app = App::new().unwrap();
351 // let workspace = app.add_model(|ctx| Workspace::new(Vec::new(), ctx));
352 // let (window_id, workspace_view) =
353 // app.add_window(|ctx| WorkspaceView::new(workspace.clone(), settings, ctx));
354
355 // let invalidations = Rc::new(RefCell::new(Vec::new()));
356 // let invalidations_ = invalidations.clone();
357 // app.on_window_invalidated(window_id, move |invalidation, _| {
358 // invalidations_.borrow_mut().push(invalidation)
359 // });
360
361 // let active_pane_id = workspace_view.update(&mut app, |view, ctx| {
362 // ctx.focus(view.active_pane());
363 // view.active_pane().id()
364 // });
365
366 // app.update(|app| {
367 // let mut presenter = Presenter::new(
368 // window_id,
369 // Rc::new(FontCache::new()),
370 // Rc::new(AssetCache::new()),
371 // app,
372 // );
373 // for invalidation in invalidations.borrow().iter().cloned() {
374 // presenter.update(vec2f(1024.0, 768.0), 2.0, Some(invalidation), app);
375 // }
376
377 // assert_eq!(
378 // presenter.responder_chain(app.ctx()).unwrap(),
379 // vec![workspace_view.id(), active_pane_id]
380 // );
381 // });
382 // }
383}