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,
            );
          },
        ),
      ),
    );
  }
}

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