Re: [E-devel] Multi-touch callbacks?

On Sat, 4 Sep 2021 19:18:50 -0500 David Grubb <[email protected]>
said:

have you tried the elementary gesture layer tests?

> I've been using EFL to build applications for a few years now and have been
> very pleased with the results the libraries enable. I have a new
> requirement to implement pinch-and-zoom so I need to start exploring
> multitouch but I'm running into a few issues getting it working.
> 
> I'm testing on my laptop which has a multitouch monitor and can confirm
> that the driver is emitting the correct kernel MT protocol events via
> evtest. For example, performing a small two finger drag I see two points
> reported and updated before release:
> 
> 
> Event: time 1630799195.877440, type 3 (EV_ABS), code 47 (ABS_MT_SLOT),
> value 0
> Event: time 1630799195.877440, type 3 (EV_ABS), code 57
> (ABS_MT_TRACKING_ID), value 2
> Event: time 1630799195.877440, type 3 (EV_ABS), code 53
> (ABS_MT_POSITION_X), value 6621
> Event: time 1630799195.877440, type 3 (EV_ABS), code 54
> (ABS_MT_POSITION_Y), value 3292
> Event: time 1630799195.877440, type 1 (EV_KEY), code 330 (BTN_TOUCH), value
> 1
> Event: time 1630799195.877440, type 3 (EV_ABS), code 0 (ABS_X), value 6621
> Event: time 1630799195.877440, type 3 (EV_ABS), code 1 (ABS_Y), value 3292
> Event: time 1630799195.877440, -------------- SYN_REPORT ------------
> Event: time 1630799195.885821, type 3 (EV_ABS), code 47 (ABS_MT_SLOT),
> value 1
> Event: time 1630799195.885821, type 3 (EV_ABS), code 57
> (ABS_MT_TRACKING_ID), value 3
> Event: time 1630799195.885821, type 3 (EV_ABS), code 53
> (ABS_MT_POSITION_X), value 5302
> Event: time 1630799195.885821, type 3 (EV_ABS), code 54
> (ABS_MT_POSITION_Y), value 3490
> Event: time 1630799195.885821, -------------- SYN_REPORT ------------
> Event: time 1630799195.943159, type 3 (EV_ABS), code 57
> (ABS_MT_TRACKING_ID), value -1
> Event: time 1630799195.943159, -------------- SYN_REPORT ------------
> Event: time 1630799195.961918, type 3 (EV_ABS), code 47 (ABS_MT_SLOT),
> value 0
> Event: time 1630799195.961918, type 3 (EV_ABS), code 57
> (ABS_MT_TRACKING_ID), value -1
> Event: time 1630799195.961918, type 1 (EV_KEY), code 330 (BTN_TOUCH), value
> 0
> 
> Next, I compiled EFL with the flags: disable-tslib, enable-xinput22, and
> enable-always-build-examples. I made a few logging additions to the
>  evas_multi_touch example so it'd print on MULTI_x callbacks, but I'm only
> seeing MOUSE_x callbacks. My understanding is that the first touch point
> would be reported as a MOUSE_DOWN/MOUSE_MOVE, and the second concurrent
> point would be reported as a MULTI_x. Is this correct, and am I missing
> something? I'm fairly confident that the driver itself is doing the correct
> thing, but I'm a bit unsure about the interaction between EFL and X (N.B.,
> the context is an OpenGL X window).
> 
> If anybody has any suggestions or a direction they can point me from here
> I'd be very grateful.
> 
> Cheers,
> Dave.
> 
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> 


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------------- Codito, ergo sum - "I code, therefore I am" --------------
Carsten Haitzler - [email protected]