Attaching horizontal and vertical scrollbar to the same widget - flutter

Question

I want to create a viewport that could be horizontally and vertically scrolled. I am able to achieve this by using two nested SingleScrollChildView. The problem is that the horizontal scrollbar is not attached to the viewport as desired but rather it is attached/present at the bottom vertically which is expected. Is there a way to achieve such a behavior? Please be gentle as I am still learning this framework. Here is the code snippet:
Scrollbar(
child: SingleChildScrollView(
scrollDirection: Axis.vertical,
child: Scrollbar(
child: SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: CustomViewPort(),
),
),
),
),

Answer 1

Like this?
Bidirectional scrolling with fixed scrollbar
I used adaptive_scrollbar v2.1.0 to get this result.
Source Code
import 'package:flutter/material.dart';
import 'package:adaptive_scrollbar/adaptive_scrollbar.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Bidirectional Scrollbars',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
#override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
#override
Widget build(BuildContext context) {
final _verticalScrollController = ScrollController();
final _horizontalScrollController = ScrollController();
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Container(
height: 300,
width: 700,
child: AdaptiveScrollbar(
underColor: Colors.blueGrey.withOpacity(0.3),
sliderDefaultColor: Colors.grey.withOpacity(0.7),
sliderActiveColor: Colors.grey,
controller: _verticalScrollController,
child: AdaptiveScrollbar(
controller: _horizontalScrollController,
position: ScrollbarPosition.bottom,
underColor: Colors.blueGrey.withOpacity(0.3),
sliderDefaultColor: Colors.grey.withOpacity(0.7),
sliderActiveColor: Colors.grey,
child: SingleChildScrollView(
controller: _verticalScrollController,
scrollDirection: Axis.vertical,
child: SingleChildScrollView(
controller: _horizontalScrollController,
scrollDirection: Axis.horizontal,
child: Padding(
padding: const EdgeInsets.only(right: 8.0, bottom: 16.0),
child: DataTable(
showCheckboxColumn: true,
columns: [
DataColumn(
label: Text('Name'),
),
DataColumn(
label: Text('Year'),
),
DataColumn(
label: Text('Year'),
),
DataColumn(
label: Text('Year'),
),
DataColumn(
label: Text('Year'),
),
DataColumn(
label: Text('Name'),
),
DataColumn(
label: Text('Year'),
),
DataColumn(
label: Text('Year'),
),
DataColumn(
label: Text('Year'),
),
DataColumn(
label: Text('Year'),
),
],
rows: List<DataRow>.generate(
20,
(int index) => DataRow(
cells: <DataCell>[
DataCell(
Text('Row $index'),
),
DataCell(
Text('Row $index'),
),
DataCell(
Text('Row $index'),
),
DataCell(
Text('Row $index'),
),
DataCell(
Text('Row $index'),
),
DataCell(
Text('Row $index'),
),
DataCell(
Text('Row $index'),
),
DataCell(
Text('Row $index'),
),
DataCell(
Text('Row $index'),
),
DataCell(
Text('Row $index'),
),
],
onSelectChanged: (bool? value) {},
),
),
),
),
),
),
),
),
),
);
}
}