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78e18a5d18
This ensures we don't run into discontinuities when reversing an animation halfway through. I refactored AnimationValue to have knowledge of the reverse curves and intervals.
64 lines
2.1 KiB
Dart
64 lines
2.1 KiB
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 'dart:sky' as sky;
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import 'package:sky/animation/animated_value.dart';
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import 'package:sky/animation/animation_performance.dart';
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import 'package:sky/animation/curves.dart';
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import 'package:sky/rendering/box.dart';
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import 'package:sky/rendering/object.dart';
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typedef void ValueChanged(bool value);
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const Duration _kToggleDuration = const Duration(milliseconds: 200);
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// RenderToggleable is a base class for material style toggleable controls with
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// toggle animations. It handles storing the current value, dispatching
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// ValueChanged on a tap gesture and driving a changed animation. Subclasses are
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// responsible for painting.
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abstract class RenderToggleable extends RenderConstrainedBox {
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RenderToggleable({bool value, Size size, ValueChanged onChanged})
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: _value = value,
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_onChanged = onChanged,
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super(additionalConstraints: new BoxConstraints.tight(size)) {
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_performance = new AnimationPerformance()
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..variable = _position
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..duration = _kToggleDuration
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..progress = _value ? 1.0 : 0.0
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..addListener(markNeedsPaint);
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}
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EventDisposition handleEvent(sky.Event event, BoxHitTestEntry entry) {
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if (event is sky.GestureEvent && event.type == 'gesturetap') {
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_onChanged(!_value);
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return EventDisposition.consumed;
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}
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return EventDisposition.ignored;
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}
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bool _value;
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bool get value => _value;
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void set value(bool value) {
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if (value == _value) return;
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_value = value;
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performance.play(value ? Direction.forward : Direction.reverse);
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}
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ValueChanged _onChanged;
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ValueChanged get onChanged => _onChanged;
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void set onChanged(ValueChanged onChanged) {
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_onChanged = onChanged;
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}
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final AnimatedValue<double> _position =
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new AnimatedValue<double>(0.0, end: 1.0, curve: easeIn, reverseCurve: easeOut);
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AnimatedValue<double> get position => _position;
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AnimationPerformance _performance;
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AnimationPerformance get performance => _performance;
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}
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