Mouse Scrolling on Windows Desktop Does Not Respect # of Lines Specified in System Settings #97924
Description
Mouse scroll on Windows has a configurable "scroll per line" setting.
Flutter should respect this setting. Otherwise, scrolling feels slow and sticky - different than users are used to.
Flutter.Scroll.Test.Windows.vs.Web.20220206.mp4
Steps to Reproduce
- Run sample code on Windows desktop.
- Scroll using a Mouse. (scrolling with trackpad is identical between desktop and web)
- Run sample on Web https://dartpad.dev/?id=1e6e721d75aec76c26bca03a68f8edda
- Observe that scroll distance and feel is different on desktop vs web.
Expected results: Scroll distance should be identical between desktop and web.
Actual results: Scroll distance is different between desktop and web.
Code sample
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Scroll Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Flutter Scroll Demo'),
);
}
}
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> {
List<Color> colors = const [Colors.amber, Colors.blueAccent, Colors.green];
ScrollController scrollController = ScrollController();
double position = 0;
@override
void initState() {
super.initState();
scrollController.addListener(() {
position = scrollController.position.extentBefore;
setState(() {});
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Stack(
children: [
ListView.builder(
controller: scrollController,
itemCount: 100,
itemBuilder: (context, index) {
int colorIndex = index % 3;
return Container(
color: colors[colorIndex],
height: 50,
);
},
),
Positioned(
bottom: 0,
right: 0,
child: Padding(
padding: const EdgeInsets.all(16),
child: Text(
'Scroll Position: ${position.round()}',
style:
const TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
),
),
),
],
),
);
}
}Logs
[√] Flutter (Channel stable, 2.10.0, on Microsoft Windows [Version 10.0.19044.1466], locale en-US)
• Flutter version 2.10.0 at D:\Development\flutter-sdk
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 5f105a6ca7 (5 days ago), 2022-02-01 14:15:42 -0800
• Engine revision 776efd2034
• Dart version 2.16.0
• DevTools version 2.9.2
[√] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
• Android SDK at D:\Development\android-sdk
• Platform android-31, build-tools 30.0.2
• ANDROID_HOME = D:\Development\android-sdk
• Java binary at: C:\Program Files\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 11.0.11+9-b60-7590822)
• All Android licenses accepted.
[√] Chrome - develop for the web
• Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
[√] Visual Studio - develop for Windows (Visual Studio Community 2022 17.0.5)
• Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community
• Visual Studio Community 2022 version 17.0.32112.339
• Windows 10 SDK version 10.0.19041.0
[√] Android Studio (version 2021.1)
• Android Studio at C:\Program Files\Android Studio
• Flutter plugin can be installed from:
https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 11.0.11+9-b60-7590822)
[√] VS Code (version 1.63.2)
• VS Code at C:\Users\Laptop\AppData\Local\Programs\Microsoft VS Code
• Flutter extension can be installed from:
https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter
[√] Connected device (3 available)
• Windows (desktop) • windows • windows-x64 • Microsoft Windows [Version 10.0.19044.1466]
• Chrome (web) • chrome • web-javascript • Google Chrome 96.0.4664.110
• Edge (web) • edge • web-javascript • Microsoft Edge 97.0.1072.69
[√] HTTP Host Availability
• All required HTTP hosts are available
• No issues found!