Flutterラボ リリース3周年記念! プロコースが1ヶ月の料金で2ヶ月間受けられる、実質半額セール (2024年3月17日まで・先着)

Drawer内で使われることが多いWidgetで、タップするとダイアログでライセンス情報を表示したいときに使用します。
import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    final ThemeData theme = Theme.of(context);
    final TextStyle textStyle = theme.textTheme.bodyText2!;
    final List<Widget> aboutBoxChildren = <Widget>[
      const SizedBox(height: 24),
      RichText(
        text: TextSpan(
          children: <TextSpan>[
            TextSpan(
                style: textStyle,
                text: "Flutter is Google's UI toolkit for building beautiful, "
                    'natively compiled applications for mobile, web, and desktop '
                    'from a single codebase. Learn more about Flutter at '),
            TextSpan(
                style: textStyle.copyWith(color: theme.colorScheme.primary),
                text: 'https://flutter.dev'),
            TextSpan(style: textStyle, text: '.'),
          ],
        ),
      ),
    ];

    return Scaffold(
      appBar: AppBar(
        title: const Text('Show About Example'),
      ),
      drawer: Drawer(
        child: SingleChildScrollView(
          child: SafeArea(
            child: AboutListTile(
              icon: const Icon(Icons.info),
              applicationIcon: const FlutterLogo(),
              applicationName: 'Show About Example',
              applicationVersion: 'August 2019',
              applicationLegalese: '\u{a9} 2014 The Flutter Authors',
              aboutBoxChildren: aboutBoxChildren,
            ),
          ),
        ),
      ),
      body: Center(
        child: ElevatedButton(
          child: const Text('Show About Example'),
          onPressed: () {
            showAboutDialog(
              context: context,
              applicationIcon: const FlutterLogo(),
              applicationName: 'Show About Example',
              applicationVersion: 'August 2019',
              applicationLegalese: '\u{a9} 2014 The Flutter Authors',
              children: aboutBoxChildren,
            );
          },
        ),
      ),
    );
  }
}