how to popup menu when long press screen use finger

[geata]

1. i use https://pub.dartlang.org/packages/menu for popup menu
2. i know it use GestureDetector
3. it works ok with mouse long press
4. but on my laptop that has touch screen, when i long press screen use finger, there is only a square zoom in

i want pop up menu whith long press screen,how can ?

[GeertJohan]

Could you provide a bit more information? What OS are you running, which touchscreen are you using?

[pchampio]

Technical aspect:
GLFW doesn't have support for touch input: glfw/glfw#42
The only kind of pointer event that we are sending to the flutter engine is mouse event (even when the touchscreen is used instead of the mouse)

go-flutter/embedder/embedder.go

Line 239 in f3939f3

device_kind: (C.FlutterPointerDeviceKind)(PointerDeviceKindMouse),

Trying to fake the touch pointer (always sending pointerkindtouch instead of pointerkindmouse) didn't help the https://api.flutter.dev/flutter/material/PopupMenuItem-class.html to show up.

[pchampio]

Your issue:
I tried out: https://github.com/CaiJingLong/flutter_long_tap_menu/tree/master/example
and managed to make it work with my mouse and my finger, my screen also has touch input, but I didn't configured linux-KDE and it behaves just like a mouse.
I'm afraid this might be a limitation from glfw, glfw might not send us any touch-input related pointer event on a properly configured display environment.