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This patch adds a base AnimatedComponent from which most components that animated should derive. It takes care of listening & unlistening from the animations during did(Un)mount as well as binding the animated value to a private field and scheduling the component for build. Note that this patch removes the did(Un)mount overridable methods from Component and replaces them with a callback mechanism which is less brittle. BUG= R=abarth@chromium.org Review URL: https://codereview.chromium.org/1027633003
35 lines
963 B
Dart
35 lines
963 B
Dart
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import '../animation/animated_value.dart';
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import '../fn.dart';
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import 'dart:mirrors';
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class AnimatedComponent extends Component {
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AnimatedComponent({ Object key }) : super(key: key, stateful: true);
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animateField(AnimatedValue value, Symbol symbol) {
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// TODO(rafaelw): Assert symbol is present on |this|, is private and
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// is over the same parameterized type as the animated value.
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var mirror = reflect(this);
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var subscription;
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mirror.setField(symbol, value.value);
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onDidMount(() {
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subscription = value.onValueChanged.listen((_) {
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mirror.setField(symbol, value.value);
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scheduleBuild();
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});
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});
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onDidUnmount(() {
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if (subscription != null) {
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subscription.cancel();
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subscription = null;
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}
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});
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}
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}
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