| // Copyright 2014 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Flutter code sample for RotationTransition |
| |
| import 'package:flutter/material.dart'; |
| |
| void main() => runApp(const MyApp()); |
| |
| class MyApp extends StatelessWidget { |
| const MyApp({super.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({super.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: true); |
| late final Animation<double> _animation = CurvedAnimation( |
| parent: _controller, |
| curve: Curves.elasticOut, |
| ); |
| |
| @override |
| void dispose() { |
| _controller.dispose(); |
| super.dispose(); |
| } |
| |
| @override |
| Widget build(BuildContext context) { |
| return Scaffold( |
| body: Center( |
| child: RotationTransition( |
| turns: _animation, |
| child: const Padding( |
| padding: EdgeInsets.all(8.0), |
| child: FlutterLogo(size: 150.0), |
| ), |
| ), |
| ), |
| ); |
| } |
| } |