Grabbing all events in a frame (with xelb?)

Grabbing all events in a frame (with xelb?)

[Lars Ingebrigtsen]

If I say

(track-mouse (read-event))

I get pretty much all the events, but I don't get things like "the shift
key has been pressed".

Is there a way to get low-level events like that "natively" in Emacs?

If not, does anybody know whether one could use the xelb/xcb library to
do something like that?  I've tried looking at the exwm window manager,
and the answer seems to be "yes", although I've been unable to whip up a
simple, minimal way to, er, xcb:GrabKey and then get the events...

Is there a xelb mailing list?  :-)

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Re: Grabbing all events in a frame (with xelb?)

[Stefan Monnier]

> Is there a way to get low-level events like that "natively" in Emacs?

Now without C-level changes, AFAIK.  But those changes are pretty simple
(I used to have a patch that added such <key>-up events, treated a bit
like the down-mouse-N events).


        Stefan

Re: Grabbing all events in a frame (with xelb?)

[Lars Ingebrigtsen]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> Is there a way to get low-level events like that "natively" in Emacs?
>
> Now without C-level changes, AFAIK.  But those changes are pretty simple
> (I used to have a patch that added such <key>-up events, treated a bit
> like the down-mouse-N events).

Thanks; sounds like that might be useful generally in Emacs?  Any reason
you didn't push that patch?  :-)

I've now made things work for my use case by using the xelb/xcb library
and popping up transparent non-Emacs windows and stuff.  It works, but a
pure Emacs-frame solution would be nice.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Re: Grabbing all events in a frame (with xelb?)

[Stefan Monnier]

>>> Is there a way to get low-level events like that "natively" in Emacs?
>> Now without C-level changes, AFAIK.  But those changes are pretty simple
>> (I used to have a patch that added such <key>-up events, treated a bit
>> like the down-mouse-N events).
> Thanks; sounds like that might be useful generally in Emacs?  Any reason
> you didn't push that patch?  :-)

Can't remember exactly.  It adds a fair bit of "noise" to view-lossage
and might introduce some breakage in some cases because of the
unexpected new events.

I can try and dig up the patch if you're interested (it was not cleaned
up but worked well enough not to get in the way of my personal use tho
I never ended up writing code that took advantage of it).


        Stefan