Holding movement threshold

[HakanL]

I believe I have asked this before but I can't find the question/answer. Is there a way to change the tolerance/threshold for holding a button to a larger value than what it's current? On my small touchscreen (Skia, RPi) I have a button close to the edge of the screen and I want to detect Holding on that. The issue is that because of the physical placement it seems to be very easy to move your fingers a few pixels, so a lot of times I don't get the holding event. Is there a setting to make the holding less sensitive? For my purpose I don't really care about cancelling/aborting a hold, if the user has touched the screen then they want to execute.

[morning4coffe-dev]

Hey @HakanL,

Thank you for your question! I don't think we/WinUI have a feature like this directly, but you can work around it using the OnPointerPressed, OnPointerMoved, and OnPointerReleased methods. You can start a timer when the button is pressed and stop it if the pointer is released or moves outside a certain threshold. Let me know if this helps!

[HakanL]

Yeah, I've done that, but it's annoying to have to do that, and also OnPointerPressed doesn't seem to work on buttons, it's never triggered.

[morning4coffe-dev]

Jup, I see, but as I mentioned afaik even WinUI doesn't have this feature, right? Can you open an issue with an enhancement request, maybe it could be considered as a useful Toolkit feature in the future.

[HakanL]

You're probably right that WinUI doesn't have that feature, I didn't look as my target platform is Linux and Skia, so WinUI isn't an option. What about OnPointerPressed on buttons, is that a WinUI limitation as well?

[MartinZikmund]

The reason is that Button class itself handles PointerPressed so it never bubbles to your handler. It should be possible to create a custom class derived from Button to override it with your own logic. Alternative I thought about could be to keep the size of the button visually the same, but adjust its template so that the margin around it is still "interactive" (e.g. by putting an invisible surface there), so that it still is active even if user moves their finger slightly.

[HakanL]

Thanks Martin, I'll try that.