import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

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

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        bottomNavigationBar: NavigationBarExample(),
      ),
    );
  }
}

class NavigationBarExample extends StatefulWidget {
  const NavigationBarExample({super.key});

  @override
  State<NavigationBarExample> createState() => _NavigationBarExampleState();
}

class _NavigationBarExampleState extends State<NavigationBarExample> {
  int index = 0;

  @override
  Widget build(BuildContext context) {
    return NavigationBar(
      elevation: 0,
      indicatorShape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(4.0),
      ),
      selectedIndex: index,
      onDestinationSelected: (int index) {
        setState(() {
          this.index = index;
        });
      },
      destinations: const <Widget>[
        NavigationDestination(
          selectedIcon: Icon(Icons.home_filled),
          icon: Icon(Icons.home_outlined),
          label: 'Home',
        ),
        NavigationDestination(
          selectedIcon: Icon(Icons.favorite),
          icon: Icon(Icons.favorite_outline),
          label: 'Favorites',
        ),
      ],
    );
  }
}