| // 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 ExpansionTile |
| |
| 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 MaterialApp( |
| title: _title, |
| home: Scaffold( |
| appBar: AppBar(title: const Text(_title)), |
| body: const MyStatefulWidget(), |
| ), |
| ); |
| } |
| } |
| |
| class MyStatefulWidget extends StatefulWidget { |
| const MyStatefulWidget({Key? key}) : super(key: key); |
| |
| @override |
| State<MyStatefulWidget> createState() => _MyStatefulWidgetState(); |
| } |
| |
| class _MyStatefulWidgetState extends State<MyStatefulWidget> { |
| bool _customTileExpanded = false; |
| |
| @override |
| Widget build(BuildContext context) { |
| return Column( |
| children: <Widget>[ |
| const ExpansionTile( |
| title: Text('ExpansionTile 1'), |
| subtitle: Text('Trailing expansion arrow icon'), |
| children: <Widget>[ |
| ListTile(title: Text('This is tile number 1')), |
| ], |
| ), |
| ExpansionTile( |
| title: const Text('ExpansionTile 2'), |
| subtitle: const Text('Custom expansion arrow icon'), |
| trailing: Icon( |
| _customTileExpanded |
| ? Icons.arrow_drop_down_circle |
| : Icons.arrow_drop_down, |
| ), |
| children: const <Widget>[ |
| ListTile(title: Text('This is tile number 2')), |
| ], |
| onExpansionChanged: (bool expanded) { |
| setState(() => _customTileExpanded = expanded); |
| }, |
| ), |
| const ExpansionTile( |
| title: Text('ExpansionTile 3'), |
| subtitle: Text('Leading expansion arrow icon'), |
| controlAffinity: ListTileControlAffinity.leading, |
| children: <Widget>[ |
| ListTile(title: Text('This is tile number 3')), |
| ], |
| ), |
| ], |
| ); |
| } |
| } |