95fc5ae070
This patch renames StatelessComponent to StatelessWidget and StatefulComponent to StatefulWidget. Fixes #2308
104 lines
3.1 KiB
Dart
104 lines
3.1 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/material.dart';
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class ProgressIndicatorDemo extends StatefulWidget {
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_ProgressIndicatorDemoState createState() => new _ProgressIndicatorDemoState();
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}
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class _ProgressIndicatorDemoState extends State<ProgressIndicatorDemo> {
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void initState() {
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super.initState();
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controller = new AnimationController(
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duration: const Duration(milliseconds: 1500)
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)..forward();
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animation = new CurvedAnimation(
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parent: controller,
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curve: new Interval(0.0, 0.9, curve: Curves.ease),
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reverseCurve: Curves.ease
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)..addStatusListener((AnimationStatus status) {
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if (status == AnimationStatus.dismissed)
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controller.forward();
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else if (status == AnimationStatus.completed)
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controller.reverse();
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});
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}
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Animation<double> animation;
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AnimationController controller;
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void _handleTap() {
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setState(() {
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// valueAnimation.isAnimating is part of our build state
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if (controller.isAnimating) {
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controller.stop();
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} else {
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switch (controller.status) {
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case AnimationStatus.dismissed:
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case AnimationStatus.forward:
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controller.forward();
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break;
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case AnimationStatus.reverse:
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case AnimationStatus.completed:
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controller.reverse();
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break;
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}
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}
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});
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}
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Widget _buildIndicators(BuildContext context, Widget child) {
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List<Widget> indicators = <Widget>[
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new SizedBox(
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width: 200.0,
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child: new LinearProgressIndicator()
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),
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new LinearProgressIndicator(),
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new LinearProgressIndicator(),
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new LinearProgressIndicator(value: animation.value),
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new CircularProgressIndicator(),
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new SizedBox(
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width: 20.0,
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height: 20.0,
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child: new CircularProgressIndicator(value: animation.value)
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),
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new SizedBox(
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width: 50.0,
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height: 30.0,
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child: new CircularProgressIndicator(value: animation.value)
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),
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new Text("${(animation.value * 100.0).toStringAsFixed(1)}%" + (controller.isAnimating ? '' : ' (paused)'))
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];
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return new Column(
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children: indicators
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.map((Widget c) => new Container(child: c, margin: const EdgeInsets.symmetric(vertical: 15.0, horizontal: 20.0)))
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.toList(),
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justifyContent: FlexJustifyContent.center
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);
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}
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Widget build(BuildContext context) {
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return new Scaffold(
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toolBar: new ToolBar(center: new Text('Progress Indicators')),
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body: new DefaultTextStyle(
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style: Theme.of(context).textTheme.title,
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child: new GestureDetector(
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onTap: _handleTap,
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behavior: HitTestBehavior.opaque,
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child: new Container(
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padding: const EdgeInsets.symmetric(vertical: 12.0, horizontal: 8.0),
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child: new AnimatedBuilder(
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animation: animation,
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builder: _buildIndicators
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)
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)
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)
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)
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);
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}
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}
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