Created
March 12, 2020 17:00
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| import 'package:flutter/material.dart'; | |
| void main() { | |
| runApp(new MaterialApp( | |
| debugShowCheckedModeBanner: false, | |
| home: new MyApp(), | |
| )); | |
| } | |
| class MyApp extends StatefulWidget { | |
| @override | |
| MyAppState createState() => new MyAppState(); | |
| } | |
| class MyAppState extends State<MyApp> { | |
| @override | |
| Widget build(BuildContext context) { | |
| return new Scaffold( | |
| appBar: new AppBar( | |
| title: new Text('Slider Demo'), | |
| ), | |
| body: new Container( | |
| color: Colors.blueAccent, | |
| padding: new EdgeInsets.all(32.0), | |
| child: new ProgressIndicatorDemo(), | |
| ), | |
| ); | |
| } | |
| } | |
| class ProgressIndicatorDemo extends StatefulWidget { | |
| @override | |
| _ProgressIndicatorDemoState createState() => | |
| new _ProgressIndicatorDemoState(); | |
| } | |
| class _ProgressIndicatorDemoState extends State<ProgressIndicatorDemo> | |
| with SingleTickerProviderStateMixin { | |
| AnimationController controller; | |
| Animation<double> animation; | |
| @override | |
| void initState() { | |
| super.initState(); | |
| controller = AnimationController( | |
| duration: const Duration(milliseconds: 2000), vsync: this); | |
| animation = Tween(begin: 0.0, end: 1.0).animate(controller) | |
| ..addListener(() { | |
| setState(() { | |
| // the state that has changed here is the animation object’s value | |
| }); | |
| }); | |
| controller.repeat(); | |
| } | |
| @override | |
| void dispose() { | |
| controller.stop(); | |
| super.dispose(); | |
| } | |
| @override | |
| Widget build(BuildContext context) { | |
| print(animation.value); | |
| return new Center( | |
| child: new Stack(children: <Widget>[ | |
| LinearProgressIndicator( | |
| value: animation.value, | |
| ), | |
| Align( | |
| alignment :Alignment.lerp(Alignment.topLeft, Alignment.topRight, animation.value), | |
| child: Text("xxxxxxxxxxxxxxxxa"), | |
| ), | |
| ])); | |
| } | |
| } |
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