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Implicit Animations - AnimatedPositioned
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import 'package:flutter/material.dart'; | |
void main() => runApp(MyApp()); | |
class MyApp extends StatelessWidget { | |
@override | |
Widget build(BuildContext context) { | |
return MaterialApp( | |
home: MyHomePage(), | |
); | |
} | |
} | |
class MyHomePage extends StatefulWidget { | |
@override | |
_MyHomePageState createState() => _MyHomePageState(); | |
} | |
const double _logoWidth = 200; | |
class OtusLogo extends StatelessWidget { | |
@override | |
Widget build(BuildContext context) { | |
return Container( | |
child: Image.network('https://github.com/flutter-cats/otus-cocktails-application/blob/master/logo-2.8602b.svg'), | |
width: _logoWidth, | |
height: 200.0, | |
color: Colors.green, | |
); | |
} | |
} | |
class _MyHomePageState extends State<MyHomePage> { | |
double _left = 0; | |
@override | |
Widget build(BuildContext context) { | |
final size = MediaQuery.of(context).size; | |
return Scaffold( | |
appBar: AppBar( | |
title: Text('Implicit Animations - AnimatedPositioned'), | |
), | |
body: Center( | |
child: Container( | |
height: 300, | |
child: Stack( | |
children: <Widget>[ | |
AnimatedPositioned( | |
duration: const Duration(milliseconds: 500), | |
left: _left, | |
child: OtusLogo(), | |
), | |
], | |
), | |
), | |
), | |
floatingActionButton: FloatingActionButton( | |
onPressed: () { | |
setState(() { | |
_left = _left > 0 ? 0 : size.width - _logoWidth; | |
}); | |
}, | |
child: Icon(Icons.opacity), | |
), // This trailing comma makes auto-formatting nicer for build methods. | |
); | |
} | |
} |
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