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Sadly, box.dart has grown much longer than 1000 lines. This patch splits it up into several files based on the class hierarchy. Fortunately, many of these classes are loosely coupled to each other.
65 lines
2.1 KiB
Dart
65 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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import 'package:sky/rendering/proxy_box.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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