Re: Touch screen zoom - any method to disable?

On Sat, 17 Feb 2024 11:20:49 +0100
Michael Gmelin <[email protected]> wrote:

> > On 17. Feb 2024, at 11:10, Milan Obuch <[email protected]> wrote:
> > 
> > On Fri, 16 Feb 2024 18:07:22 +0100
> > Michael Gmelin <[email protected]> wrote:
> >   
> >>>> On 16. Feb 2024, at 13:35, Milan Obuch <[email protected]>
> >>>> wrote:  
> >>> 
> >>> On Fri, 16 Feb 2024 13:04:14 +0100
> >>> Michael Gmelin <[email protected]> wrote:
> >>>   
> >>>>>> On 16. Feb 2024, at 12:46, Milan Obuch <[email protected]>
> >>>>>> wrote:    
> >>>>> 
> >>>>> Hi,
> >>>>> 
> >>>>> I have a terminal with touch screen running luakit with custom
> >>>>> application. Basically, it works as intended, however, sometimes
> >>>>> user unknowingly zooms into part of screen.
> >>>>> 
> >>>>> While relatively easy, all that's necessary is unzoom it using
> >>>>> two fingers (the same way as used on smartphones), it scares
> >>>>> this user a bit. So the best way to handle it would be not
> >>>>> allowing zoom to occur.
> >>>>> 
> >>>>> Is there a method to do this? Some configuration of X? My setup
> >>>>> uses webcamd to create event file for touch screen and libinput
> >>>>> driver to handle input event in X.      

[ snip ]

> >> Ok, this is a wild shot, but does
> >> 
> >>  xinput disable 10
> >> 
> >> help?
> >>   
> > 
> > No. Actually, it is my main keyboard device, PS/2 connected via KVM
> > switch via USB to PS/2 converter, and disabling it just disabled
> > keyboard input (I have spare USB keyboard here so I was prepared for
> > this, I was able to enable it after test). Zoom via touchscreen two
> > finger gesture still worked (and unzoom as well).  
> 
> Could you run xev while pinching and see which events are generated?

After installing x11/xev, trying xev, I see a bunch of events being
reported. Not easy to navigate through :)

However, doing some more tests, I found it is probably somehow handled
a bit higher - this zoom feature is not available in terminal, mailer,
pdf viewer. I can use it in all browsers I use - minibrowser from GTK
port, badwolf and luakit. In xev, I see just ButtonPress, sequence of
MotionNotify, ButtonRelease events. Maybe if I can attach xev to
browser window, things could be somewhat different, question is how can
find window id I can use in xev invocation.

Regards,
Milan