1use crate::{
2 app::{AppContext, MutableAppContext, WindowInvalidation},
3 elements::Element,
4 font_cache::FontCache,
5 json::{self, ToJson},
6 platform::Event,
7 text_layout::TextLayoutCache,
8 Action, AnyAction, AssetCache, ElementBox, FontSystem, Scene,
9};
10use pathfinder_geometry::vector::{vec2f, Vector2F};
11use serde_json::json;
12use std::{
13 collections::{HashMap, HashSet},
14 ops::{Deref, DerefMut},
15 sync::Arc,
16};
17
18pub struct Presenter {
19 window_id: usize,
20 rendered_views: HashMap<usize, ElementBox>,
21 parents: HashMap<usize, usize>,
22 font_cache: Arc<FontCache>,
23 text_layout_cache: TextLayoutCache,
24 asset_cache: Arc<AssetCache>,
25 last_mouse_moved_event: Option<Event>,
26 titlebar_height: f32,
27}
28
29impl Presenter {
30 pub fn new(
31 window_id: usize,
32 titlebar_height: f32,
33 font_cache: Arc<FontCache>,
34 text_layout_cache: TextLayoutCache,
35 asset_cache: Arc<AssetCache>,
36 cx: &mut MutableAppContext,
37 ) -> Self {
38 Self {
39 window_id,
40 rendered_views: cx.render_views(window_id, titlebar_height),
41 parents: HashMap::new(),
42 font_cache,
43 text_layout_cache,
44 asset_cache,
45 last_mouse_moved_event: None,
46 titlebar_height,
47 }
48 }
49
50 pub fn dispatch_path(&self, app: &AppContext) -> Vec<usize> {
51 let mut view_id = app.focused_view_id(self.window_id).unwrap();
52 let mut path = vec![view_id];
53 while let Some(parent_id) = self.parents.get(&view_id).copied() {
54 path.push(parent_id);
55 view_id = parent_id;
56 }
57 path.reverse();
58 path
59 }
60
61 pub fn invalidate(&mut self, mut invalidation: WindowInvalidation, cx: &mut MutableAppContext) {
62 for view_id in invalidation.removed {
63 invalidation.updated.remove(&view_id);
64 self.rendered_views.remove(&view_id);
65 self.parents.remove(&view_id);
66 }
67 for view_id in invalidation.updated {
68 self.rendered_views.insert(
69 view_id,
70 cx.render_view(self.window_id, view_id, self.titlebar_height, false)
71 .unwrap(),
72 );
73 }
74 }
75
76 pub fn refresh(
77 &mut self,
78 invalidation: Option<WindowInvalidation>,
79 cx: &mut MutableAppContext,
80 ) {
81 if let Some(invalidation) = invalidation {
82 for view_id in invalidation.removed {
83 self.rendered_views.remove(&view_id);
84 self.parents.remove(&view_id);
85 }
86 }
87
88 for (view_id, view) in &mut self.rendered_views {
89 *view = cx
90 .render_view(self.window_id, *view_id, self.titlebar_height, true)
91 .unwrap();
92 }
93 }
94
95 pub fn build_scene(
96 &mut self,
97 window_size: Vector2F,
98 scale_factor: f32,
99 cx: &mut MutableAppContext,
100 ) -> Scene {
101 let mut scene = Scene::new(scale_factor);
102
103 if let Some(root_view_id) = cx.root_view_id(self.window_id) {
104 self.layout(window_size, cx);
105 let mut paint_cx = PaintContext {
106 scene: &mut scene,
107 font_cache: &self.font_cache,
108 text_layout_cache: &self.text_layout_cache,
109 rendered_views: &mut self.rendered_views,
110 app: cx.as_ref(),
111 };
112 paint_cx.paint(root_view_id, Vector2F::zero());
113 self.text_layout_cache.finish_frame();
114
115 if let Some(event) = self.last_mouse_moved_event.clone() {
116 self.dispatch_event(event, cx)
117 }
118 } else {
119 log::error!("could not find root_view_id for window {}", self.window_id);
120 }
121
122 scene
123 }
124
125 fn layout(&mut self, size: Vector2F, cx: &mut MutableAppContext) {
126 if let Some(root_view_id) = cx.root_view_id(self.window_id) {
127 self.layout_cx(cx)
128 .layout(root_view_id, SizeConstraint::strict(size));
129 }
130 }
131
132 pub fn layout_cx<'a>(&'a mut self, cx: &'a mut MutableAppContext) -> LayoutContext<'a> {
133 LayoutContext {
134 rendered_views: &mut self.rendered_views,
135 parents: &mut self.parents,
136 font_cache: &self.font_cache,
137 font_system: cx.platform().fonts(),
138 text_layout_cache: &self.text_layout_cache,
139 asset_cache: &self.asset_cache,
140 view_stack: Vec::new(),
141 app: cx,
142 }
143 }
144
145 pub fn dispatch_event(&mut self, event: Event, cx: &mut MutableAppContext) {
146 if let Some(root_view_id) = cx.root_view_id(self.window_id) {
147 match event {
148 Event::MouseMoved { .. } => {
149 self.last_mouse_moved_event = Some(event.clone());
150 }
151 Event::LeftMouseDragged { position } => {
152 self.last_mouse_moved_event = Some(Event::MouseMoved {
153 position,
154 left_mouse_down: true,
155 });
156 }
157 _ => {}
158 }
159
160 let mut event_cx = EventContext {
161 rendered_views: &mut self.rendered_views,
162 dispatched_actions: Default::default(),
163 font_cache: &self.font_cache,
164 text_layout_cache: &self.text_layout_cache,
165 view_stack: Default::default(),
166 invalidated_views: Default::default(),
167 app: cx,
168 };
169 event_cx.dispatch_event(root_view_id, &event);
170
171 let invalidated_views = event_cx.invalidated_views;
172 let dispatch_directives = event_cx.dispatched_actions;
173
174 for view_id in invalidated_views {
175 cx.notify_view(self.window_id, view_id);
176 }
177 for directive in dispatch_directives {
178 cx.dispatch_action_any(self.window_id, &directive.path, directive.action.as_ref());
179 }
180 }
181 }
182
183 pub fn debug_elements(&self, cx: &AppContext) -> Option<json::Value> {
184 cx.root_view_id(self.window_id)
185 .and_then(|root_view_id| self.rendered_views.get(&root_view_id))
186 .map(|root_element| {
187 root_element.debug(&DebugContext {
188 rendered_views: &self.rendered_views,
189 font_cache: &self.font_cache,
190 app: cx,
191 })
192 })
193 }
194}
195
196pub struct DispatchDirective {
197 pub path: Vec<usize>,
198 pub action: Box<dyn AnyAction>,
199}
200
201pub struct LayoutContext<'a> {
202 rendered_views: &'a mut HashMap<usize, ElementBox>,
203 parents: &'a mut HashMap<usize, usize>,
204 view_stack: Vec<usize>,
205 pub font_cache: &'a Arc<FontCache>,
206 pub font_system: Arc<dyn FontSystem>,
207 pub text_layout_cache: &'a TextLayoutCache,
208 pub asset_cache: &'a AssetCache,
209 pub app: &'a mut MutableAppContext,
210}
211
212impl<'a> LayoutContext<'a> {
213 fn layout(&mut self, view_id: usize, constraint: SizeConstraint) -> Vector2F {
214 if let Some(parent_id) = self.view_stack.last() {
215 self.parents.insert(view_id, *parent_id);
216 }
217 self.view_stack.push(view_id);
218 let mut rendered_view = self.rendered_views.remove(&view_id).unwrap();
219 let size = rendered_view.layout(constraint, self);
220 self.rendered_views.insert(view_id, rendered_view);
221 self.view_stack.pop();
222 size
223 }
224}
225
226pub struct PaintContext<'a> {
227 rendered_views: &'a mut HashMap<usize, ElementBox>,
228 pub scene: &'a mut Scene,
229 pub font_cache: &'a FontCache,
230 pub text_layout_cache: &'a TextLayoutCache,
231 pub app: &'a AppContext,
232}
233
234impl<'a> PaintContext<'a> {
235 fn paint(&mut self, view_id: usize, origin: Vector2F) {
236 if let Some(mut tree) = self.rendered_views.remove(&view_id) {
237 tree.paint(origin, self);
238 self.rendered_views.insert(view_id, tree);
239 }
240 }
241}
242
243pub struct EventContext<'a> {
244 rendered_views: &'a mut HashMap<usize, ElementBox>,
245 dispatched_actions: Vec<DispatchDirective>,
246 pub font_cache: &'a FontCache,
247 pub text_layout_cache: &'a TextLayoutCache,
248 pub app: &'a mut MutableAppContext,
249 view_stack: Vec<usize>,
250 invalidated_views: HashSet<usize>,
251}
252
253impl<'a> EventContext<'a> {
254 fn dispatch_event(&mut self, view_id: usize, event: &Event) -> bool {
255 if let Some(mut element) = self.rendered_views.remove(&view_id) {
256 self.view_stack.push(view_id);
257 let result = element.dispatch_event(event, self);
258 self.view_stack.pop();
259 self.rendered_views.insert(view_id, element);
260 result
261 } else {
262 false
263 }
264 }
265
266 pub fn dispatch_action<A: Action>(&mut self, action: A) {
267 self.dispatched_actions.push(DispatchDirective {
268 path: self.view_stack.clone(),
269 action: Box::new(action),
270 });
271 }
272
273 pub fn notify(&mut self) {
274 self.invalidated_views
275 .insert(*self.view_stack.last().unwrap());
276 }
277}
278
279impl<'a> Deref for EventContext<'a> {
280 type Target = MutableAppContext;
281
282 fn deref(&self) -> &Self::Target {
283 self.app
284 }
285}
286
287impl<'a> DerefMut for EventContext<'a> {
288 fn deref_mut(&mut self) -> &mut Self::Target {
289 self.app
290 }
291}
292
293pub struct DebugContext<'a> {
294 rendered_views: &'a HashMap<usize, ElementBox>,
295 pub font_cache: &'a FontCache,
296 pub app: &'a AppContext,
297}
298
299#[derive(Clone, Copy, Debug, Eq, PartialEq)]
300pub enum Axis {
301 Horizontal,
302 Vertical,
303}
304
305impl Axis {
306 pub fn invert(self) -> Self {
307 match self {
308 Self::Horizontal => Self::Vertical,
309 Self::Vertical => Self::Horizontal,
310 }
311 }
312}
313
314impl ToJson for Axis {
315 fn to_json(&self) -> serde_json::Value {
316 match self {
317 Axis::Horizontal => json!("horizontal"),
318 Axis::Vertical => json!("vertical"),
319 }
320 }
321}
322
323pub trait Vector2FExt {
324 fn along(self, axis: Axis) -> f32;
325}
326
327impl Vector2FExt for Vector2F {
328 fn along(self, axis: Axis) -> f32 {
329 match axis {
330 Axis::Horizontal => self.x(),
331 Axis::Vertical => self.y(),
332 }
333 }
334}
335
336#[derive(Copy, Clone, Debug)]
337pub struct SizeConstraint {
338 pub min: Vector2F,
339 pub max: Vector2F,
340}
341
342impl SizeConstraint {
343 pub fn new(min: Vector2F, max: Vector2F) -> Self {
344 Self { min, max }
345 }
346
347 pub fn strict(size: Vector2F) -> Self {
348 Self {
349 min: size,
350 max: size,
351 }
352 }
353
354 pub fn strict_along(axis: Axis, max: f32) -> Self {
355 match axis {
356 Axis::Horizontal => Self {
357 min: vec2f(max, 0.0),
358 max: vec2f(max, f32::INFINITY),
359 },
360 Axis::Vertical => Self {
361 min: vec2f(0.0, max),
362 max: vec2f(f32::INFINITY, max),
363 },
364 }
365 }
366
367 pub fn max_along(&self, axis: Axis) -> f32 {
368 match axis {
369 Axis::Horizontal => self.max.x(),
370 Axis::Vertical => self.max.y(),
371 }
372 }
373
374 pub fn min_along(&self, axis: Axis) -> f32 {
375 match axis {
376 Axis::Horizontal => self.min.x(),
377 Axis::Vertical => self.min.y(),
378 }
379 }
380}
381
382impl ToJson for SizeConstraint {
383 fn to_json(&self) -> serde_json::Value {
384 json!({
385 "min": self.min.to_json(),
386 "max": self.max.to_json(),
387 })
388 }
389}
390
391pub struct ChildView {
392 view_id: usize,
393}
394
395impl ChildView {
396 pub fn new(view_id: usize) -> Self {
397 Self { view_id }
398 }
399}
400
401impl Element for ChildView {
402 type LayoutState = ();
403 type PaintState = ();
404
405 fn layout(
406 &mut self,
407 constraint: SizeConstraint,
408 cx: &mut LayoutContext,
409 ) -> (Vector2F, Self::LayoutState) {
410 let size = cx.layout(self.view_id, constraint);
411 (size, ())
412 }
413
414 fn paint(
415 &mut self,
416 bounds: pathfinder_geometry::rect::RectF,
417 _: &mut Self::LayoutState,
418 cx: &mut PaintContext,
419 ) -> Self::PaintState {
420 cx.paint(self.view_id, bounds.origin());
421 }
422
423 fn dispatch_event(
424 &mut self,
425 event: &Event,
426 _: pathfinder_geometry::rect::RectF,
427 _: &mut Self::LayoutState,
428 _: &mut Self::PaintState,
429 cx: &mut EventContext,
430 ) -> bool {
431 cx.dispatch_event(self.view_id, event)
432 }
433
434 fn debug(
435 &self,
436 bounds: pathfinder_geometry::rect::RectF,
437 _: &Self::LayoutState,
438 _: &Self::PaintState,
439 cx: &DebugContext,
440 ) -> serde_json::Value {
441 json!({
442 "type": "ChildView",
443 "view_id": self.view_id,
444 "bounds": bounds.to_json(),
445 "child": if let Some(view) = cx.rendered_views.get(&self.view_id) {
446 view.debug(cx)
447 } else {
448 json!(null)
449 }
450 })
451 }
452}
453
454#[cfg(test)]
455mod tests {
456 // #[test]
457 // fn test_responder_chain() {
458 // let settings = settings_rx(None);
459 // let mut app = App::new().unwrap();
460 // let workspace = app.add_model(|cx| Workspace::new(Vec::new(), cx));
461 // let (window_id, workspace_view) =
462 // app.add_window(|cx| WorkspaceView::new(workspace.clone(), settings, cx));
463
464 // let invalidations = Rc::new(RefCell::new(Vec::new()));
465 // let invalidations_ = invalidations.clone();
466 // app.on_window_invalidated(window_id, move |invalidation, _| {
467 // invalidations_.borrow_mut().push(invalidation)
468 // });
469
470 // let active_pane_id = workspace_view.update(&mut app, |view, cx| {
471 // cx.focus(view.active_pane());
472 // view.active_pane().id()
473 // });
474
475 // app.update(|app| {
476 // let mut presenter = Presenter::new(
477 // window_id,
478 // Rc::new(FontCache::new()),
479 // Rc::new(AssetCache::new()),
480 // app,
481 // );
482 // for invalidation in invalidations.borrow().iter().cloned() {
483 // presenter.update(vec2f(1024.0, 768.0), 2.0, Some(invalidation), app);
484 // }
485
486 // assert_eq!(
487 // presenter.responder_chain(app.cx()).unwrap(),
488 // vec![workspace_view.id(), active_pane_id]
489 // );
490 // });
491 // }
492}