| // 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 [AnimatedSize]. |
| |
| 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 MaterialApp( |
| title: _title, |
| home: Scaffold( |
| appBar: AppBar(title: const Text(_title)), |
| body: const Center( |
| child: MyStatefulWidget(), |
| ), |
| ), |
| ); |
| } |
| } |
| |
| class MyStatefulWidget extends StatefulWidget { |
| const MyStatefulWidget({super.key}); |
| |
| @override |
| State<MyStatefulWidget> createState() => _MyStatefulWidgetState(); |
| } |
| |
| class _MyStatefulWidgetState extends State<MyStatefulWidget> { |
| double _size = 50.0; |
| bool _large = false; |
| |
| void _updateSize() { |
| setState(() { |
| _size = _large ? 250.0 : 100.0; |
| _large = !_large; |
| }); |
| } |
| |
| @override |
| Widget build(BuildContext context) { |
| return GestureDetector( |
| onTap: () => _updateSize(), |
| child: Container( |
| color: Colors.amberAccent, |
| child: AnimatedSize( |
| curve: Curves.easeIn, |
| duration: const Duration(seconds: 1), |
| child: FlutterLogo(size: _size), |
| ), |
| ), |
| ); |
| } |
| } |