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9bc64540c5
Now a RenderBox is considered hit if one of its children are hit or it itself decides that it's hit. In particular, empty space inside a flex won't be hit because none of the children are located there and a RenderFlex doesn't consider itself hittable. Fixes #53 Fixes #1221
79 lines
2.1 KiB
Dart
79 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 'package:flutter/animation.dart';
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import 'package:flutter/gestures.dart';
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import 'binding.dart';
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import 'box.dart';
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import 'object.dart';
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import 'proxy_box.dart';
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typedef void ValueChanged<T>(T 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({
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bool value,
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Size size,
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this.onChanged
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}) : _value = value,
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super(additionalConstraints: new BoxConstraints.tight(size)) {
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_performance = new ValuePerformance<double>(
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variable: new AnimatedValue<double>(0.0, end: 1.0, curve: Curves.easeIn, reverseCurve: Curves.easeOut),
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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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bool get value => _value;
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bool _value;
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void set value(bool value) {
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if (value == _value)
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return;
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_value = value;
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performance.play(value ? AnimationDirection.forward : AnimationDirection.reverse);
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}
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ValueChanged<bool> onChanged;
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ValuePerformance<double> get performance => _performance;
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ValuePerformance<double> _performance;
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double get position => _performance.value;
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TapGestureRecognizer _tap;
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void attach() {
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super.attach();
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_tap = new TapGestureRecognizer(
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router: FlutterBinding.instance.pointerRouter,
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onTap: _handleTap
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);
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}
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void detach() {
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_tap.dispose();
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_tap = null;
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super.detach();
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}
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void handleEvent(InputEvent event, BoxHitTestEntry entry) {
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if (event.type == 'pointerdown' && onChanged != null)
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_tap.addPointer(event);
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}
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void _handleTap() {
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if (onChanged != null)
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onChanged(!_value);
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}
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bool hitTestSelf(Point position) => true;
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}
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