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// 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 [Scrollbar].
import 'package:flutter/material.dart';
void main() => runApp(const ScrollbarApp());
class ScrollbarApp extends StatelessWidget {
const ScrollbarApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(title: const Text('Scrollbar Sample')),
body: const Center(
child: MyStatefulWidget(),
),
),
);
}
}
class MyStatefulWidget extends StatefulWidget {
const MyStatefulWidget({super.key});
@override
State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}
class _MyStatefulWidgetState extends State<MyStatefulWidget> {
final ScrollController controller = ScrollController();
@override
Widget build(BuildContext context) {
return LayoutBuilder(
builder: (BuildContext context, BoxConstraints constraints) {
return Row(
children: <Widget>[
SizedBox(
width: constraints.maxWidth / 2,
// When running this sample on desktop, two scrollbars will be
// visible here. One is the default scrollbar and the other is the
// Scrollbar widget with custom thickness.
child: Scrollbar(
thickness: 20.0,
thumbVisibility: true,
controller: controller,
child: ListView.builder(
controller: controller,
itemCount: 100,
itemBuilder: (BuildContext context, int index) {
return SizedBox(
height: 50,
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Text('Scrollable 1 : Index $index'),
),
);
},
),
)),
SizedBox(
width: constraints.maxWidth / 2,
// When running this sample on desktop, one scrollbar will be
// visible here. The default scrollbar is hidden by setting the
// ScrollConfiguration's scrollbars to false. The Scrollbar widget
// with custom thickness is visible.
child: Scrollbar(
thickness: 20.0,
thumbVisibility: true,
child: ScrollConfiguration(
behavior: ScrollConfiguration.of(context)
.copyWith(scrollbars: false),
child: ListView.builder(
primary: true,
itemCount: 100,
itemBuilder: (BuildContext context, int index) {
return SizedBox(
height: 50,
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Text('Scrollable 2 : Index $index'),
),
);
},
),
),
)),
],
);
});
}
}