Touchpad scroll on chromebooks doesn't work on stable (1.7.8+hotfix.2) #36118
Description
Summary
Two finger trackpad scroll used to work, and now it doesn't. I did a (sloooow) binary search through the commits between stable releases. The commit which broke trackpad scrolling is 7f969d0. Unfortunately, that was a pretty complex PR (well, at least for my flutter skills), and I wasn't able to figure out what exactly went wrong.
Steps to Reproduce:
I used a slightly modified version of the counter example to make a scrollable list.
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
_counter++;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: ListView(
children: [
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
SizedBox(height: 16),
...List.generate(_counter, (index) {
return Padding(
padding: EdgeInsets.symmetric(vertical: 8),
child: Text('#$index'),
);
}),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}
- Run the app on a chromebook. I tested on an ASUS C202, a Lenovo e300, and
one more (I don't have the model at hand, I'll add it when I can look)an HP Chromebook x360 - Click the
+button until you have a list that goes past the bottom of the window - Try to scroll with two fingers on the trackpad
Expected Result
The app scrolls
Actual Result
The app doesn't scroll
Logs
I didn't see anything in the verbose logs
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel unknown, v1.6.1-pre.56, on Mac OS X 10.14.5 18F132, locale en-US)
[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
[!] iOS toolchain - develop for iOS devices (Xcode 10.2.1)
✗ Verify that all connected devices have been paired with this computer in Xcode.
If all devices have been paired, libimobiledevice and ideviceinstaller may require updating.
To update with Brew, run:
brew update
brew uninstall --ignore-dependencies libimobiledevice
brew uninstall --ignore-dependencies usbmuxd
brew install --HEAD usbmuxd
brew unlink usbmuxd
brew link usbmuxd
brew install --HEAD libimobiledevice
brew install ideviceinstaller
[✓] Android Studio (version 3.4)
[✓] VS Code (version 1.36.1)
[!] Connected device