| // 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 [AnimatedPositioned]. |
| |
| 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> { |
| bool selected = false; |
| |
| @override |
| Widget build(BuildContext context) { |
| return SizedBox( |
| width: 200, |
| height: 350, |
| child: Stack( |
| children: <Widget>[ |
| AnimatedPositioned( |
| width: selected ? 200.0 : 50.0, |
| height: selected ? 50.0 : 200.0, |
| top: selected ? 50.0 : 150.0, |
| duration: const Duration(seconds: 2), |
| curve: Curves.fastOutSlowIn, |
| child: GestureDetector( |
| onTap: () { |
| setState(() { |
| selected = !selected; |
| }); |
| }, |
| child: Container( |
| color: Colors.blue, |
| child: const Center(child: Text('Tap me')), |
| ), |
| ), |
| ), |
| ], |
| ), |
| ); |
| } |
| } |