| // 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 LayoutBuilder |
| |
| 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: MyStatelessWidget(), |
| ); |
| } |
| } |
| |
| class MyStatelessWidget extends StatelessWidget { |
| const MyStatelessWidget({Key? key}) : super(key: key); |
| |
| @override |
| Widget build(BuildContext context) { |
| return Scaffold( |
| appBar: AppBar(title: const Text('LayoutBuilder Example')), |
| body: LayoutBuilder( |
| builder: (BuildContext context, BoxConstraints constraints) { |
| if (constraints.maxWidth > 600) { |
| return _buildWideContainers(); |
| } else { |
| return _buildNormalContainer(); |
| } |
| }, |
| ), |
| ); |
| } |
| |
| Widget _buildNormalContainer() { |
| return Center( |
| child: Container( |
| height: 100.0, |
| width: 100.0, |
| color: Colors.red, |
| ), |
| ); |
| } |
| |
| Widget _buildWideContainers() { |
| return Center( |
| child: Row( |
| mainAxisAlignment: MainAxisAlignment.spaceEvenly, |
| children: <Widget>[ |
| Container( |
| height: 100.0, |
| width: 100.0, |
| color: Colors.red, |
| ), |
| Container( |
| height: 100.0, |
| width: 100.0, |
| color: Colors.yellow, |
| ), |
| ], |
| ), |
| ); |
| } |
| } |