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Matrix #3
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| import 'package:flutter/material.dart'; | |
| void main() => runApp(MyApp()); | |
| class MyApp extends StatelessWidget { | |
| @override | |
| Widget build(BuildContext context) { | |
| return MaterialApp( | |
| title: 'Perspective', | |
| theme: ThemeData(primarySwatch: Colors.blue), | |
| home: MyHomePage(), | |
| ); | |
| } | |
| } | |
| class MyHomePage extends StatefulWidget { | |
| MyHomePage({Key key}) : super(key: key); | |
| @override | |
| _MyHomePageState createState() => _MyHomePageState(); | |
| } | |
| class _MyHomePageState extends State<MyHomePage> | |
| with SingleTickerProviderStateMixin { | |
| Offset _offset = Offset.zero; | |
| int _counter = 0; | |
| AnimationController _controller; | |
| Animation<Offset> _flingAnimation; | |
| @override | |
| void initState() { | |
| super.initState(); | |
| _controller = AnimationController(vsync: this) | |
| ..addListener(() => setState(() { | |
| _offset = _flingAnimation.value; | |
| })); | |
| } | |
| @override | |
| void dispose() { | |
| _controller.dispose(); | |
| super.dispose(); | |
| } | |
| @override | |
| Widget build(BuildContext context) { | |
| return AnimatedBuilder( | |
| animation: _controller, | |
| child: GestureDetector( | |
| onDoubleTap: () => setState(() { | |
| _offset = Offset.zero; | |
| _counter = 0; | |
| }), | |
| onPanStart: (details) => setState(() { | |
| _controller.stop(); | |
| }), | |
| onPanUpdate: (details) => setState(() => _offset += details.delta), | |
| onPanEnd: (details) { | |
| print('$_offset, End: $details'); | |
| }, | |
| child: _defaultApp(context), | |
| ), | |
| builder: (BuildContext context, Widget child) { | |
| return Transform( | |
| transform: Matrix4.identity() | |
| ..setEntry(3, 2, 0.001) // perspective | |
| ..rotateX(0.01 * _offset.dy) | |
| ..rotateY(-0.01 * _offset.dx), | |
| alignment: FractionalOffset.center, | |
| child: child, | |
| ); | |
| }); | |
| } | |
| // from the original default app | |
| void _incrementCounter() { | |
| setState(() { | |
| _counter++; | |
| }); | |
| } | |
| _defaultApp(BuildContext context) { | |
| return Scaffold( | |
| appBar: AppBar( | |
| title: Text('Tilt-a-Whirl'), | |
| ), | |
| body: Center( | |
| child: Column( | |
| mainAxisAlignment: MainAxisAlignment.center, | |
| children: [ | |
| Text( | |
| 'You have pushed the button this many times:', | |
| ), | |
| Text( | |
| '$_counter', | |
| style: Theme.of(context).textTheme.display1, | |
| ), | |
| ], | |
| ), | |
| ), | |
| floatingActionButton: FloatingActionButton( | |
| onPressed: _incrementCounter, | |
| tooltip: 'Increment', | |
| child: Icon(Icons.add), | |
| ), | |
| ); | |
| } | |
| } |
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