Fwd: Re: Support for multiple independent mouse cursors

Aivils Stoss aivils at latnet.lv
Tue Apr 25 23:28:45 PDT 2006

On Trešdiena, 26. Aprīlis 2006 04:11, Peter Hutterer wrote:
> Yes, it is possible. MPX supports it to a certain extent.
> Each window (that is, each GUI element) can be assigned an access
> list. Only devices in the access list (or in the case of the DENY
> access list only devices NOT in the access list) will send events to
> the given window. Because it is window-based you can even do things
> like 5 users access the same application but only one user can press
> the save button.
> The interface is very basic at the moment, but the support is there.
> The only problems that are there is that it is hard to do it on a per-
> process basis. A process can open multiple connections to the X
> Server and there's no way to determine which connection belongs to
> which process.

You can check out and compare commercial X for multiple local users
at userful.com . That server uses proxy server for connections, so
real X recieves packets labeled by specific user (may be). I didn't
test that server realy but download freeware software packed and read out
all content. I couldn't even imagine how hard or easy is modifying of
existing lbxproxy.

I by myself still use multiple X servers on my home box. Single server
per user :o)

Aivils Stoss

> the _NET_WM_CLIENT atom is voluntarily and doesn't
> work to well. The only way I found around that is the following:
> modify X lib so that each time a window is created it also sets an
> atom on this window to the PID of the process that opened it. MPWM
> supports this so-called FORCE_PID hack and colours the windows
> accordingly.
> If you look at the screenshot http://wearables.unisa.edu.au/mpx/
> images/gimp_dualinputproblems.png you can see that one of the buttons
> is coloured red. That means that the WM knows that GIMP belongs to
> the red user.
> If you want to automatically assign an application you would need a
> similar hack to set the user ID to a given window.
> Talking about that I realized that I did not include the FORCE_PID
> patches for xlib. I will update the website.
> Cheers,
>    Peter
> On 26/04/2006, at 9:55 AM, Friedrich W. H. Kossebau wrote:
> > Am Mittwoch, 26. April 2006 01:34, schrieb Peter Hutterer:
> > [Multi-Pointer X Server (MPX)]
> >
> >> I'd appreciate any feedback.
> >
> > Cool, cool stuff :)
> >
> > Now if the following works a dream came true for me:
> >
> > Is there any possibility to bind cursors* to users? So events are
> > only sent to
> > windows of programs run by that user? And also those windows where
> > the owner
> > of the running program invited others to join (think whiteboard)?
> >
> > * and other input devices
> >
> > Regards
> > Friedrich, a plain casual observer of X development
> > _______________________________________________
> > xorg mailing list
> > xorg at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/xorg
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