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import 'package:flutter/material.dart'; | |
void main() => runApp(const MyApp()); | |
class MyApp extends StatelessWidget { | |
const MyApp({Key? key}) : super(key: key); | |
static const String _title = 'Flutter Code Sample'; | |
@override | |
Widget build(BuildContext context) { | |
return const MaterialApp( | |
title: _title, | |
home: MyStatefulWidget(), | |
); | |
} | |
} | |
class MyStatefulWidget extends StatefulWidget { | |
const MyStatefulWidget({Key? key}) : super(key: key); | |
@override | |
State<MyStatefulWidget> createState() => _MyStatefulWidgetState(); | |
} | |
/// AnimationControllers can be created with `vsync: this` because of TickerProviderStateMixin. | |
class _MyStatefulWidgetState extends State<MyStatefulWidget> | |
with TickerProviderStateMixin { | |
late final AnimationController _controller = AnimationController( | |
duration: const Duration(seconds: 2), | |
vsync: this, | |
)..repeat(reverse: false); | |
late final Animation<double> _animation = CurvedAnimation( | |
parent: _controller, | |
curve: Curves.easeInOut, | |
); | |
@override | |
void dispose() { | |
_controller.dispose(); | |
super.dispose(); | |
} | |
@override | |
Widget build(BuildContext context) { | |
return Scaffold( | |
body: Center( | |
child: RotationTransition( | |
turns: _animation, | |
child: Padding( | |
padding: const EdgeInsets.all(8.0), | |
child: Container( | |
padding: const EdgeInsets.all(32.0), | |
decoration: const BoxDecoration( | |
color: Colors.orange, | |
shape: BoxShape.circle, | |
), | |
child: const FlutterLogo(size: 150.0), | |
), | |
), | |
), | |
), | |
); | |
} | |
} |
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