88 lines
2.0 KiB
Dart
88 lines
2.0 KiB
Dart
// Copyright 2017 The Chromium 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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import 'package:flutter/material.dart';
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class Entry {
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Entry(this.title, [this.children = const <Entry>[]]);
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final String title;
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final List<Entry> children;
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}
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final List<Entry> data = <Entry>[
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new Entry('Chapter A',
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<Entry>[
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new Entry('Section A0',
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<Entry>[
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new Entry('Item A0.1'),
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new Entry('Item A0.2'),
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new Entry('Item A0.3'),
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],
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),
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new Entry('Section A1'),
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new Entry('Section A2'),
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],
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),
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new Entry('Chapter B',
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<Entry>[
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new Entry('Section B0'),
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new Entry('Section B1'),
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],
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),
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new Entry('Chapter C',
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<Entry>[
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new Entry('Section C0'),
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new Entry('Section C1'),
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new Entry('Section C2',
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<Entry>[
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new Entry('Item C2.0'),
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new Entry('Item C2.1'),
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new Entry('Item C2.2'),
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new Entry('Item C2.3'),
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],
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),
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],
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),
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];
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class EntryItem extends StatelessWidget {
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EntryItem(this.entry);
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final Entry entry;
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Widget _buildTiles(Entry root) {
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if (root.children.isEmpty)
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return new ListTile(title: new Text(root.title));
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return new ExpansionTile(
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key: new ValueKey<Entry>(root),
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title: new Text(root.title),
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children: root.children.map(_buildTiles).toList(),
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);
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}
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@override
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Widget build(BuildContext context) {
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return _buildTiles(entry);
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}
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}
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class ExpansionTileSample extends StatelessWidget {
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@override
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Widget build(BuildContext context) {
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return new Scaffold(
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appBar: new AppBar(
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title: const Text('ExpansionTile'),
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),
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body: new ListView.builder(
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itemBuilder: (BuildContext context, int index) => new EntryItem(data[index]),
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itemCount: data.length,
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),
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);
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}
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}
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void main() {
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runApp(new MaterialApp(home: new ExpansionTileSample()));
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}
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