flutter/examples/api/lib/material/tabs/tab_bar.1.dart

// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Flutter code sample for [TabBar].

import 'package:flutter/material.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(useMaterial3: true),
      home: const TabBarExample(),
    );
  }
}

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

  @override
  State<TabBarExample> createState() => _TabBarExampleState();
}

/// [AnimationController]s can be created with `vsync: this` because of
/// [TickerProviderStateMixin].
class _TabBarExampleState extends State<TabBarExample> with TickerProviderStateMixin {
  late final TabController _tabController;

  @override
  void initState() {
    super.initState();
    _tabController = TabController(length: 3, vsync: this);
  }

  @override
  void dispose() {
    _tabController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('TabBar Sample'),
        bottom: TabBar(
          controller: _tabController,
          tabs: const <Widget>[
            Tab(
              icon: Icon(Icons.cloud_outlined),
            ),
            Tab(
              icon: Icon(Icons.beach_access_sharp),
            ),
            Tab(
              icon: Icon(Icons.brightness_5_sharp),
            ),
          ],
        ),
      ),
      body: TabBarView(
        controller: _tabController,
        children: const <Widget>[
          Center(
            child: Text("It's cloudy here"),
          ),
          Center(
            child: Text("It's rainy here"),
          ),
          Center(
            child: Text("It's sunny here"),
          ),
        ],
      ),
    );
  }
}