import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Segmented Button Demo'),
    );
  }
}

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

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  var _themeMode = ThemeMode.light;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: SegmentedButton(
          showSelectedIcon: false,
          segments: const [
            ButtonSegment(
              icon: Icon(Icons.light_mode),
              label: Text('Light mode'),
              value: ThemeMode.light,
            ),
            ButtonSegment(
              icon: Icon(Icons.dark_mode),
              label: Text('Dark mode'),
              value: ThemeMode.dark,
            ),
          ],
          selected: {_themeMode},
          onSelectionChanged: (selected) {
            setState(() {
              _themeMode = selected.first;
            });
          },
        ),
      ),
    );
  }
}