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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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