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Linux: mouse click events other than primary, secondary and tertiary are not recognized #152128
Description
Steps to reproduce
- create a Linux Flutter app with
flutter create --platforms=linux --org com.test my_app- Create an implementation of BaseTapGestureRecognizer
class NthTap extends BaseTapGestureRecognizer {
GestureTapDownCallback? onTapDown;
NthTap({
super.debugOwner,
super.supportedDevices,
super.allowedButtonsFilter,
});
@override
void handleTapCancel({
required PointerDownEvent down,
PointerCancelEvent? cancel,
required String reason,
}) {}
@override
void handleTapDown({required PointerDownEvent down}) {
final TapDownDetails details = TapDownDetails(
globalPosition: down.position,
localPosition: down.localPosition,
kind: getKindForPointer(down.pointer),
);
if (onTapDown != null) {
invokeCallback<void>('onTapDown', () => onTapDown!(details));
}
}
@override
void handleTapUp({
required PointerDownEvent down,
required PointerUpEvent up,
}) {}
}- Use it inside the widget tree
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return const MaterialApp(
home: MyHomePage(),
);
}
}
class MyHomePage extends StatelessWidget {
const MyHomePage({super.key});
@override
Widget build(BuildContext context) {
return RawGestureDetector(
gestures: <Type, GestureRecognizerFactory>{
NthTap: GestureRecognizerFactoryWithHandlers<NthTap>(
() => NthTap(),
(instance) =>
instance.onTapDown = (details) => ScaffoldMessenger.of(context)
..clearSnackBars()
..showSnackBar(SnackBar(
content: Center(
child: Text(
details.globalPosition.toString(),
),
),
behavior: SnackBarBehavior.floating,
)),
),
},
child: const Scaffold(),
);
}
}Expected results
All mouse buttons should be recognized
Actual results
Only 1.,2. and 3. buttons are recognized. 4th and 5th arent
Code sample
Code sample
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return const MaterialApp(
home: MyHomePage(),
);
}
}
class MyHomePage extends StatelessWidget {
const MyHomePage({super.key});
@override
Widget build(BuildContext context) {
return RawGestureDetector(
gestures: <Type, GestureRecognizerFactory>{
NthTap: GestureRecognizerFactoryWithHandlers<NthTap>(
() => NthTap(),
(instance) =>
instance.onTapDown = (details) => ScaffoldMessenger.of(context)
..clearSnackBars()
..showSnackBar(SnackBar(
content: Center(
child: Text(
details.globalPosition.toString(),
),
),
behavior: SnackBarBehavior.floating,
)),
),
},
child: const Scaffold(),
);
}
}
class NthTap extends BaseTapGestureRecognizer {
GestureTapDownCallback? onTapDown;
NthTap({
super.debugOwner,
super.supportedDevices,
super.allowedButtonsFilter,
});
@override
void handleTapCancel({
required PointerDownEvent down,
PointerCancelEvent? cancel,
required String reason,
}) {}
@override
void handleTapDown({required PointerDownEvent down}) {
final TapDownDetails details = TapDownDetails(
globalPosition: down.position,
localPosition: down.localPosition,
kind: getKindForPointer(down.pointer),
);
if (onTapDown != null) {
invokeCallback<void>('onTapDown', () => onTapDown!(details));
}
}
@override
void handleTapUp({
required PointerDownEvent down,
required PointerUpEvent up,
}) {}
}
Screenshots or Video
Screenshots / Video demonstration
Bildschirmaufzeichnung.vom.2024-07-22.20-18-47.mp4
Logs
Logs
[Paste your logs here]Flutter Doctor output
Doctor output
frederik@xps:~/my_app$ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.19.5, on Ubuntu 24.04 LTS 6.8.0-31-generic, locale de_DE.UTF-8)
[!] Android toolchain - develop for Android devices (Android SDK version 33.0.0-rc2)
✗ No Java Development Kit (JDK) found; You must have the environment variable JAVA_HOME set and the java binary in your PATH. You can download the JDK from
https://www.oracle.com/technetwork/java/javase/downloads/.
[✓] Chrome - develop for the web
[✓] Linux toolchain - develop for Linux desktop
[!] Android Studio (not installed)
[✓] VS Code (version 1.91.1)
[✓] Connected device (2 available)
[✓] Network resources
! Doctor found issues in 2 categories.this also happens in 3.22.2 stable
Activity
danagbemava-nc commentedon Jul 23, 2024
Reproducible using the code sample provided above.
I tested the code sample on web and it worked as expected. As pointed out in #115641 (comment), it appears that the engine does not forward the events.
flutter doctor -v
robert-ancell commentedon Feb 18, 2025
Some research on this:
kPointerButtonMousePrimary,kPointerButtonMouseSecondary,kPointerButtonMouseMiddle,kPointerButtonMouseBackandkPointerButtonMouseForwardin a bitfield.1<<5.GDK_BUTTON_PRIMARY,GDK_BUTTON_MIDDLEandGDK_BUTTON_SECONDARY.BTN_FORWARDmapped to 9 andBTN_BACKmapped to 10.Open questions:
kPointerButtonMouseBackandkPointerButtonMouseForward.robert-ancell commentedon Feb 18, 2025
On my mouse (MX Anywhere 2) tested on Ubuntu 24.10
Confusingly if we reverse the Linux mapping for the Wayland codes we get button 9 mapping to
BTN_EXTRAand button 8 mapping toBTN_SIDE.robert-ancell commentedon Feb 18, 2025
I've found some prior art - Epiphany (a web browser) hard codes button 8 and 9 as back and forward.
robert-ancell commentedon Feb 18, 2025
I was originally looking in the Chromium source to see how it did forward/back. I was unable to find the Linux input code for this - if anyone knows please link it here!
hatl commentedon Feb 27, 2025
here's what i found in Chromium - the Ozone platform abstraction layer:
https://github.com/chromium/chromium/blob/3a370e4849a00fee0601a5bae7826f964fa9b044/ui/events/ozone/evdev/input_injector_evdev.cc#L45
https://github.com/chromium/chromium/blob/3a370e4849a00fee0601a5bae7826f964fa9b044/ui/ozone/platform/wayland/host/wayland_pointer.cc#L137
https://chromium.googlesource.com/chromium/src/+/main/docs/ozone_overview.md
robert-ancell commentedon Feb 28, 2025
Good confirmation - they map BTN_EXTRA to forward, which matches what I calculated. They also map BTN_FORWARD as well, so perhaps there is a case where some devices use different codes? Epiphany doesn't do this, so I expect it doesn't happen.