Re: [STUMP] Multitouch in StumpWM

[Shawn Betts]

Hi Alex,

Are you talking about this:

http://who-t.blogspot.ca/2011/12/multitouch-in-x-getting-events.html

If so then what you need to do is implement the X Input 2.2 extension
in CLX. It might not actually be all that hard. Hell, maybe someone
has already done it?

The X protocol is just bits and bytes sent over a socket. So anything
can implement the protocol and be an X client. That's what CLX does.
It implements the protocol from the ground up in Lisp. For better or
worse that means you can't just piggyback off all the work done in C
and write a little FFI code to get access to the functionality.

Anyway, if you have the time and energy it might be a lot of fun to
implement XInput in CLX. You'd probably get a warm round of applause
from the lisp community.

-Shawn

On Fri, Dec 6, 2013 at 3:21 PM, Alexander Popolitov <address@hidden> wrote:
>
> On 12/06/2013 10:12 PM, J. David Smith wrote:
>
> I am. I have a tablet that I've looked at converting into a mini linux box
> and was wondering if a solution like this existed.
>
> So now I've read through Peter Hutterer's blog, where he explains, how to
> get multitouch events from C code, but I'm rather confused.
> As far as I understand, StumpWM listens to events from X server using CLX
> library, and then dispatches those events to opened windows.
> From that I'd expect, that CLX would be heavily using FFI's to call
> C-functions, but the only C-related code there seems to be in the socket.c
> file.
> And absence of touch* events in CLX's DECLARE-EVENT macros seems to
> indicate, that there's no multitouch support already in CLX.
>
> So:
> 1) does event-dispatching indeed occur like this (X server -> StumpWM ->
> windows), or windows receive events somehow directly from X?
> 2) How does CLX manage to avoid all this fuss with FFI-ying bunch of
> C-functions? Perhaps, it's using some yet more lower-level API?
>
>
> On Fri, Dec 6, 2013 at 5:38 PM, Alexander Popolitov <address@hidden>
> wrote:
>>
>> Hello everyone,
>>
>> I've recently bought x86 tablet and managed to run on it linux + SBCL +
>> StumpWM just fine.
>> However, interaction still heavily relies on keyboard, and I want to make
>> it, somewhat useable in 'touchscreen-only' mode)
>> I've quickly hacked https://github.com/mabragor/stump-touchy-mode-line,
>> which, together with TouchEgg launched
>> at startup, makes the whole setup useable.
>>
>> So now I'm aimed at proper multitouch support within StumpWM, so the
>> question is: is anybody interested in this
>> other than me?
>>
>> Best regards,
>> Alex
>>
>> _______________________________________________
>> Stumpwm-devel mailing list
>> address@hidden
>> https://lists.nongnu.org/mailman/listinfo/stumpwm-devel
>
>
>
>
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