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// 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')),
],
),
],
);
}
}