Not a direct answer but: Try the droidparty [touch] abstraction:

https://github.com/chr15m/PdDroidParty/tree/master/droidparty-abstractions

It uses data structures to make a draggable xy slider(set), vanilla-only.

On May 12, 2022, at 7:23 AM, pd-list-request@lists.iem.at wrote:

Message: 2
Date: Thu, 12 May 2022 13:54:07 +0200
From: "Peter P." <peterparker@fastmail.com>
To: pd-list <pd-list@lists.iem.at>
Subject: [PD] two sliders on top of each other (XY-Controller)?
Message-ID: <20220512115407.oh2xglvqq3a4yjhl@fastmail.com>
Content-Type: text/plain; charset=us-ascii

Hi list,

jus tried if two sliders placed on top of each other could work as a
simple XY-contoller. They do not, but more interestingly it is the lower
of the two slider that receives the mouse clicks while the upper is
visible. Is this intentional? 

Could GUI objects be transparent in color as well as for clicks in any
way?

I know about the canvas-objects reporting their positions (and it would
be cool if they would report mouse-downs and -ups as well), but don't
like the fact that I have to be in edit mode to move them.

It seems there is no other vanilla way for xy-controllers then...

thanks!
Peter

--------
Dan Wilcox
@danomatika
danomatika.com
robotcowboy.com