Scrollbar
sample.packages.flutter.lib.src.material.scrollbar.46.
When [thumbVisibility] is true, the scrollbar thumb will remain visible without the fade animation. This requires that a [ScrollController] is provided to controller, or that the [PrimaryScrollController] is available.
When a [ScrollView.scrollDirection] is [Axis.horizontal], it is recommended that the [Scrollbar] is always visible, since scrolling in the horizontal axis is less discoverable.
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
static const String _title = 'Flutter Code Sample';
@override
Widget build(BuildContext context) {
return MaterialApp(
title: _title,
home: Scaffold(
appBar: AppBar(title: const Text(_title)),
body: const MyStatefulWidget(),
),
);
}
}
class MyStatefulWidget extends StatefulWidget {
const MyStatefulWidget({Key? key}) : super(key: key);
@override
State createState() => _MyStatefulWidgetState();
}
class _MyStatefulWidgetState extends State {
final ScrollController _controllerOne = ScrollController();
@override
Widget build(BuildContext context) {
return Scrollbar(
controller: _controllerOne,
thumbVisibility: true,
child: GridView.builder(
controller: _controllerOne,
itemCount: 120,
gridDelegate:
const SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 3),
itemBuilder: (BuildContext context, int index) {
return Center(
child: Text('item $index'),
);
},
),
);
}
}
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