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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 import '../animation/animated_value.dart'; | 5 import '../animation/animated_value.dart'; |
6 import '../fn.dart'; | 6 import '../fn.dart'; |
7 import 'dart:mirrors'; | 7 import 'dart:mirrors'; |
8 | 8 |
9 abstract class AnimatedComponent extends Component { | 9 abstract class AnimatedComponent extends Component { |
10 AnimatedComponent({ Object key }) : super(key: key, stateful: true); | 10 AnimatedComponent({ Object key }) : super(key: key, stateful: true); |
11 | 11 |
| 12 var _debugAnimatedFields = new Set<Symbol>(); |
| 13 bool _debugIsNotYetAnimated(Symbol s) { |
| 14 return _debugAnimatedFields.add(s); |
| 15 } |
| 16 |
12 animateField(AnimatedValue value, Symbol symbol) { | 17 animateField(AnimatedValue value, Symbol symbol) { |
13 // TODO(rafaelw): Assert symbol is present on |this|, is private and | 18 // TODO(rafaelw): Assert symbol is present on |this|, is private and |
14 // is over the same parameterized type as the animated value. | 19 // is over the same parameterized type as the animated value. |
15 var mirror = reflect(this); | 20 var mirror = reflect(this); |
16 var subscription; | 21 var subscription; |
17 | 22 |
| 23 assert(_debugIsNotYetAnimated(symbol)); |
18 mirror.setField(symbol, value.value); | 24 mirror.setField(symbol, value.value); |
19 | 25 |
20 onDidMount(() { | 26 onDidMount(() { |
21 subscription = value.onValueChanged.listen((_) { | 27 subscription = value.onValueChanged.listen((_) { |
22 mirror.setField(symbol, value.value); | 28 mirror.setField(symbol, value.value); |
23 scheduleBuild(); | 29 scheduleBuild(); |
24 }); | 30 }); |
25 }); | 31 }); |
26 | 32 |
27 onDidUnmount(() { | 33 onDidUnmount(() { |
28 if (subscription != null) { | 34 if (subscription != null) { |
29 subscription.cancel(); | 35 subscription.cancel(); |
30 subscription = null; | 36 subscription = null; |
31 } | 37 } |
32 }); | 38 }); |
33 } | 39 } |
34 } | 40 } |
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