scrollbar_display_always.dart

import 'package:flutter/material.dart';

/// able to show scrollbar always with following example
/// available with changes from this branch https://github.com/onatcipli/flutter/tree/scrollbar_display_always

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

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

  bool _displayAlways = false;

  int _itemCount = 15;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('displayAlways : $_displayAlways'),
        ),
        body: Scrollbar(
          displayAlways: _displayAlways,
          controller: _controller,
          child: ListView.builder(
            controller: _controller,
            itemCount: _itemCount,
            itemBuilder: (BuildContext context, int index) {
              return ListTile(
                title: Text('Numbers 123'),
                contentPadding: EdgeInsets.all(15),
              );
            },
          ),
        ),
        floatingActionButton: FloatingActionButton(
          child: Icon(Icons.threed_rotation),
          onPressed: () {
            setState(() {
              _displayAlways = !_displayAlways;
            });
          },
        ),
      ),
    );
  }
}