Input Event Handling

Thorsten Wilms t_w_ at
Wed Apr 4 08:21:21 PDT 2007

On Wed, Apr 04, 2007 at 11:42:47AM -0300, Tiago Vignatti wrote:
> Thorsten Wilms escreveu:
> >Hi!
> >
> >I'm working on a concept that deals with mapping user input device 
> >events to actions. For this it would be better to know how input 
> >events are handled currently. Searched for a while, even had a look 
> >at the ICCCM but failed to get anything out of it.
> >
> >I initialy though it would be roughly like this:
> >device -> driver->kernel -> userspace
> >If X is running:
> >device -> driver->kernel -> x-server -> WM -> app that has focus
> >Where events can be interpreted and not passed on on every level.
> >
> >In a random IRC channel I have been told that events are not passed 
> >through the WM. But how can the WM intercept shortcuts, then?
> >
> >With further thinking, input focus might happen on 3 levels:
> >widget, window, application. Right?
> >
> >If I hit Alt-F1 to switch to the first console, is that shortcut 
> >interpreted by the kernel or the x-server?
> >
> >Does the x-server anything special to receive all input events?
> >
> >Does the kernel have a concept like input focus?
> >
> >So please enlighten me about what way input events take, where 
> >they can be intercepted (shortcuts) and how input focus is 
> >structured.
> >
> >
> There is a great documentation in xorg wiki which could help you:

Thanks for the link, but I saw it before and there's none of the 
info I'm looking for (only the separation of core events is  
vaguely interesting).

Thorsten Wilms

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