import 'package:flutter/material.dart';

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

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

  // This widget is the root of your application.
  @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> {
  int _currentIndex = 0;
  BottomNavigationBarType _type = BottomNavigationBarType.fixed;


  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        child: Text(
          _type.name,
          style: Theme.of(context).textTheme.titleLarge,
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _switchToggle,
        tooltip: 'Switch',
        child: const Icon(Icons.swap_calls),
      ),
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: _currentIndex,
        onTap: (index) => setState(() {
          _currentIndex = index;
        }),
        items: const [
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: 'Home',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.list),
            label: 'List',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.person),
            label: 'Profile',
          )
        ],
        type: _type,
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }

  void _switchToggle() {
    setState(() {
      if (_type == BottomNavigationBarType.shifting) {
        _type = BottomNavigationBarType.fixed;
      } else {
        _type = BottomNavigationBarType.shifting;
      }
    });
  }
}