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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.
98 lines
3.2 KiB
Dart
98 lines
3.2 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 Radio.toggleable
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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 shows how to enable deselecting a radio button by setting the
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// [toggleable] attribute.
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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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int? groupValue;
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static const List<String> selections = <String>[
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'Hercules Mulligan',
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'Eliza Hamilton',
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'Philip Schuyler',
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'Maria Reynolds',
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'Samuel Seabury',
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];
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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body: ListView.builder(
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itemBuilder: (BuildContext context, int index) {
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return Row(
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mainAxisSize: MainAxisSize.min,
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crossAxisAlignment: CrossAxisAlignment.center,
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children: <Widget>[
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Radio<int>(
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value: index,
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groupValue: groupValue,
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// TRY THIS: Try setting the toggleable value to false and
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// see how that changes the behavior of the widget.
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toggleable: true,
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onChanged: (int? value) {
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setState(() {
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groupValue = value;
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});
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}),
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Text(selections[index]),
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],
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);
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},
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itemCount: selections.length,
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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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