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1 // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 import 'dart:async'; | 5 import 'dart:async'; |
6 | 6 |
7 import 'package:observatory/src/elements/helpers/rendering_queue.dart'; | 7 import 'package:observatory/src/elements/helpers/rendering_queue.dart'; |
8 export 'package:observatory/src/elements/helpers/rendering_queue.dart'; | 8 export 'package:observatory/src/elements/helpers/rendering_queue.dart'; |
9 | 9 |
10 /// A generic renderable object. | 10 /// A generic renderable object. |
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25 assert(otherRenderScheduled != null); | 25 assert(otherRenderScheduled != null); |
26 } | 26 } |
27 } | 27 } |
28 | 28 |
29 /// Scheduler for rendering operations. | 29 /// Scheduler for rendering operations. |
30 class RenderingScheduler<T extends Renderable> implements RenderingTask { | 30 class RenderingScheduler<T extends Renderable> implements RenderingTask { |
31 bool _enabled = false; | 31 bool _enabled = false; |
32 bool _dirty = false; | 32 bool _dirty = false; |
33 bool _renderingScheduled = false; | 33 bool _renderingScheduled = false; |
34 bool _notificationScheduled = false; | 34 bool _notificationScheduled = false; |
| 35 bool _waitForBarrier = false; |
35 | 36 |
36 /// Element managed by this scheduler. | 37 /// Element managed by this scheduler. |
37 final T element; | 38 final T element; |
38 | 39 |
39 /// Queue used for rendering operations. | 40 /// Queue used for rendering operations. |
40 final RenderingQueue queue; | 41 final RenderingQueue queue; |
41 | 42 |
42 final List<Future> _wait = <Future>[]; | 43 final List<Future> _wait = <Future>[]; |
43 | 44 |
44 /// Does the element need a new rendering cycle. | 45 /// Does the element need a new rendering cycle. |
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96 dirty(); | 97 dirty(); |
97 else | 98 else |
98 scheduleNotification(); | 99 scheduleNotification(); |
99 return newValue; | 100 return newValue; |
100 } | 101 } |
101 | 102 |
102 /// Schedules a new rendering phase. | 103 /// Schedules a new rendering phase. |
103 void scheduleRendering() { | 104 void scheduleRendering() { |
104 if (_renderingScheduled) return; | 105 if (_renderingScheduled) return; |
105 if (!_enabled) return; | 106 if (!_enabled) return; |
106 queue.enqueue(this); | 107 queue.enqueue(this, waitForBarrier: _waitForBarrier); |
| 108 _waitForBarrier = true; |
107 _renderingScheduled = true; | 109 _renderingScheduled = true; |
108 } | 110 } |
109 | 111 |
110 /// Renders the element (if the scheduler is enabled). | 112 /// Renders the element (if the scheduler is enabled). |
111 /// It will clear the dirty flag. | 113 /// It will clear the dirty flag. |
112 void render() { | 114 void render() { |
113 if (!_enabled) return; | 115 if (!_enabled) return; |
114 _dirty = false; | 116 _dirty = false; |
115 _wait.clear(); | 117 _wait.clear(); |
116 element.render(); | 118 element.render(); |
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130 _wait.addAll(it); | 132 _wait.addAll(it); |
131 } | 133 } |
132 | 134 |
133 Future _notify() async { | 135 Future _notify() async { |
134 await Future.wait(_wait); | 136 await Future.wait(_wait); |
135 _wait.clear(); | 137 _wait.clear(); |
136 _onRendered.add(new RenderedEvent<T>(element, _dirty)); | 138 _onRendered.add(new RenderedEvent<T>(element, _dirty)); |
137 _notificationScheduled = false; | 139 _notificationScheduled = false; |
138 } | 140 } |
139 } | 141 } |
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