Draggable Scrollbar App

main.dart

import 'package:draggable_scrollbar/draggable_scrollbar.dart';
import 'package:flutter/material.dart';

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

class MyApp extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _MyApp();
  }
}

class _MyApp extends State<MyApp> {
  ScrollController _controller = ScrollController();

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text("Draggable App"),
        ),
        body: Container(
          child: DraggableScrollbar.arrows(
            labelTextBuilder: (double offset) => Text("${offset ~/ 100}"),
            controller: _controller,
            child: ListView.builder(
              controller: _controller,
              itemCount: 1000,
              itemExtent: 100.0,
              itemBuilder: (context, index) {
                return Container(
                  padding: EdgeInsets.all(8.0),
                  child: Material(
                    elevation: 4.0,
                    borderRadius: BorderRadius.circular(4.0),
                    color: Colors.purple[index % 9 * 100],
                    child: Center(
                      child: Text(index.toString()),
                    ),
                  ),
                );
              },
            ),
          ),
        ),
      ),
    );
  }
}