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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 'dart:async'; | |
6 | |
7 import '../animation/animated_value.dart'; | |
8 import 'basic.dart'; | |
9 | |
10 typedef void SetterFunction(double value); | |
11 | |
12 class _AnimationEntry { | |
13 _AnimationEntry(this.value, this.setter); | |
14 final AnimatedValue value; | |
15 final SetterFunction setter; | |
16 StreamSubscription<double> subscription; | |
17 } | |
18 | |
19 abstract class AnimatedComponent extends Component { | |
20 | |
21 AnimatedComponent({ Object key }) : super(key: key, stateful: true); | |
22 | |
23 void syncFields(AnimatedComponent source) { } | |
24 | |
25 List<_AnimationEntry> _animatedFields = new List<_AnimationEntry>(); | |
26 | |
27 animate(AnimatedValue value, SetterFunction setter) { | |
28 assert(!mounted); | |
29 setter(value.value); | |
30 _animatedFields.add(new _AnimationEntry(value, setter)); | |
31 } | |
32 | |
33 void didMount() { | |
34 for (_AnimationEntry entry in _animatedFields) { | |
35 entry.subscription = entry.value.onValueChanged.listen((_) { | |
36 entry.setter(entry.value.value); | |
37 scheduleBuild(); | |
38 }); | |
39 } | |
40 super.didMount(); | |
41 } | |
42 | |
43 void didUnmount() { | |
44 for (_AnimationEntry entry in _animatedFields) { | |
45 assert(entry.subscription != null); | |
46 entry.subscription.cancel(); | |
47 entry.subscription = null; | |
48 } | |
49 super.didUnmount(); | |
50 } | |
51 | |
52 } | |
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