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List:       xfree86-devel
Subject:    Re: Capturing events from the root window (ID20311056 ignore this number)
From:       "Raymond Jennings" <raymondjennings32 () hotmail ! com>
Date:       2003-10-31 21:24:46
[Download RAW message or body]

Unless you "own" the root window, you probably can't intercept events.  The 
X server knows which connection each window "belongs" to, and only THAT 
connection gets events relayed to it.  Short of hacking X, there's no way to 
"steal" messages.  You COULD monitor the stacking order, and listen for 
interesting events on YOUR window, and periodically (once every 1/10th of a 
second or so) POLL the status and stacking order of your window.  All 
windows are visible (i.e. the X server will tell you that they exist, where 
they are, etc), but you can only receive events related to windows that YOU 
own.


>From: "Gerhard W. Gruber" <sparhawk@gmx.at>
>Reply-To: devel@xfree86.org
>To: Devel@XFree86.Org
>Subject: Re: Capturing events from the root window
>Date: Thu, 30 Oct 2003 23:07:37 +0100
>
>On Fri, 31 Oct 2003 08:51:07 +1100, Carsten Haitzler (The Rasterman)
><raster@rasterman.com> wrote:
>
> >you willonly then get events when the mouse passes over your thin window.
>
>That's no problem as long as my window stays on top.
>
> >not as a widget - no. you'll have to jump down to gdk. i'm not sure if 
>gdk
> >supports this though. you'll want an inputonly window thats a toplevel 
>window
> >(immediate child of root) thats override-redirect. you'll need to also 
>monitor
>
>I managed to create an invisible window which is only one pixel in widht 
>and
>has the same height as the screen (hardcoded for now, how can I query the
>current resolution?).  The only problem, I still have is, to make the 
>window
>stay on top of all others in order to always receive input events when the
>user moves the mouse to the right border (or where he configured it).
>
>Is it possible to create a window that always stays on top? Not only of 
>it's
>own application, but of all application windows.
>If not, is it possible to get an event when my window is obscured or 
>lowered
>because another window has been raised over it? Actually getting the inof 
>when
>it is obscored would be enough because it only needs to stay accessible all
>the time and for this it doesn't have to be the top window. And can I raise 
>a
>window above all others? I browsed the web for this, but it seems that is 
>also
>not possible. Everytime I think of a new way how to achieve what I need it
>seems to be blocked by X. :(
>
> >all client windows, where they move, go etc. and follow.... i'm still not 
>even
> >100% sure what it is you want to actually do (in overall aim)
>
>You can take a look in the readme at
>http://sourceforge.net/projects/launchmenu, there I explain it. Its just a
>simple app that has been proven quite usefull to me over the years and I 
>wrote
>this for myself because the original source is not portable and the author
>doesn't give away all the source anyway.
>If you don't want to download the package, it is of course in the CVS as 
>well.
>
> >there's a whole extension devoted to recording events - the xrecord 
>extension -
> >but i know very little about it. :)
>
>No prob. It wouldn't do what I need anyway.
>
>--
>Gerhard Gruber
>
>Für jedes menschliche Problem gibt es immer eine einfache Lösung:
>Klar, einleuchtend und falsch. (Henry Louis Mencken)
>
>_______________________________________________
>Devel mailing list
>Devel@XFree86.Org
>http://XFree86.Org/mailman/listinfo/devel

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