Scroll tabbar programmatically + Flutter

We can achieve this using scrollController. Use a ScrollController to control the horizontal scrolling of the TabBar. The scrollTabBar function is used to scroll the TabBar when the previous and next arrow buttons are pressed. This approach allows you to scroll the TabBar without changing the current tab index.

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: TabBarDemo(),
    );
  }
}

class TabBarDemo extends StatefulWidget {
  @override
  _TabBarDemoState createState() => _TabBarDemoState();
}

class _TabBarDemoState extends State<TabBarDemo> with SingleTickerProviderStateMixin {
  late TabController _tabController;
  late ScrollController _scrollController;

  @override
  void initState() {
    super.initState();
    _tabController = TabController(length: 4, vsync: this);
    _scrollController = ScrollController();
  }

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

  void scrollTabBar(int scrollAmount) {
    if (_scrollController.hasClients) {
      final maxScrollExtent = _scrollController.position.maxScrollExtent;
      final newPosition = _scrollController.offset + scrollAmount;
      if (newPosition >= 0 && newPosition <= maxScrollExtent) {
        _scrollController.animateTo(
          newPosition,
          duration: Duration(milliseconds: 300),
          curve: Curves.ease,
        );
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Scrollable TabBar Example'),
        actions: [
          IconButton(
            icon: Icon(Icons.arrow_back),
            onPressed: () {
              scrollTabBar(-50); // Scroll to the left
            },
          ),
          IconButton(
            icon: Icon(Icons.arrow_forward),
            onPressed: () {
              scrollTabBar(50); // Scroll to the right
            },
          ),
        ],
        bottom: TabBar(
          controller: _tabController,
          isScrollable: true,
          tabs: [
            Tab(text: 'Tab 1'),
            Tab(text: 'Tab 2'),
            Tab(text: 'Tab 3'),
            Tab(text: 'Tab 4'),
          ],
          controller: _tabController,
          labelColor: Colors.blue,
          unselectedLabelColor: Colors.black,
          indicatorSize: TabBarIndicatorSize.label,
        ),
      ),
      body: SingleChildScrollView(
        controller: _scrollController, // Control the scroll
        scrollDirection: Axis.horizontal,
        child: Row(
          children: [
            Container(
              width: MediaQuery.of(context).size.width * 4, // Adjust width as needed
              child: TabBarView(
                controller: _tabController,
                children: [
                  Center(child: Text('Tab 1 Content')),
                  Center(child: Text('Tab 2 Content')),
                  Center(child: Text('Tab 3 Content')),
                  Center(child: Text('Tab 4 Content')),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}