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This extracts the sample code out from the API doc comments, and places them in separate files on disk, allowing running of the examples locally, testing them, and building of slightly larger examples.
99 lines
3.3 KiB
Dart
99 lines
3.3 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Template: dev/snippets/config/templates/stateful_widget_scaffold.tmpl
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//
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// Comment lines marked with "▼▼▼" and "▲▲▲" are used for authoring
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// of samples, and may be ignored if you are just exploring the sample.
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// Flutter code sample for ExpansionTile
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//
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//***************************************************************************
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//* ▼▼▼▼▼▼▼▼ description ▼▼▼▼▼▼▼▼ (do not modify or remove section marker)
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// This example demonstrates different configurations of ExpansionTile.
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//* ▲▲▲▲▲▲▲▲ description ▲▲▲▲▲▲▲▲ (do not modify or remove section marker)
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//***************************************************************************
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import 'package:flutter/material.dart';
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void main() => runApp(const MyApp());
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/// This is the main application widget.
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class MyApp extends StatelessWidget {
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const MyApp({Key? key}) : super(key: key);
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static const String _title = 'Flutter Code Sample';
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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title: _title,
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home: Scaffold(
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appBar: AppBar(title: const Text(_title)),
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body: const MyStatefulWidget(),
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),
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);
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}
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}
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/// This is the stateful widget that the main application instantiates.
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class MyStatefulWidget extends StatefulWidget {
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const MyStatefulWidget({Key? key}) : super(key: key);
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@override
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State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
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}
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/// This is the private State class that goes with MyStatefulWidget.
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class _MyStatefulWidgetState extends State<MyStatefulWidget> {
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//********************************************************************
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//* ▼▼▼▼▼▼▼▼ code ▼▼▼▼▼▼▼▼ (do not modify or remove section marker)
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bool _customTileExpanded = false;
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@override
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Widget build(BuildContext context) {
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return Column(
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children: <Widget>[
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const ExpansionTile(
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title: Text('ExpansionTile 1'),
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subtitle: Text('Trailing expansion arrow icon'),
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children: <Widget>[
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ListTile(title: Text('This is tile number 1')),
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],
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),
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ExpansionTile(
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title: const Text('ExpansionTile 2'),
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subtitle: const Text('Custom expansion arrow icon'),
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trailing: Icon(
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_customTileExpanded
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? Icons.arrow_drop_down_circle
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: Icons.arrow_drop_down,
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),
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children: const <Widget>[
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ListTile(title: Text('This is tile number 2')),
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],
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onExpansionChanged: (bool expanded) {
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setState(() => _customTileExpanded = expanded);
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},
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),
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const ExpansionTile(
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title: Text('ExpansionTile 3'),
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subtitle: Text('Leading expansion arrow icon'),
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controlAffinity: ListTileControlAffinity.leading,
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children: <Widget>[
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ListTile(title: Text('This is tile number 3')),
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],
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),
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],
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);
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}
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//* ▲▲▲▲▲▲▲▲ code ▲▲▲▲▲▲▲▲ (do not modify or remove section marker)
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//********************************************************************
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}
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