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