I really don't know anything about X, so take what I'm proposing with a
grain of salt, but I'm wondering if there would be a way to make it work.
Could the application make an exact copy of the root window and have all
other apps treat this as the root window. Then, couldn't you intercept
anything coming from the window manager and decide what to do with it before
it gets sent onto the running applications?
just a thought,
Chris
----- Original Message -----
From: Alfredo Kengi Kojima <kojima@xxxxxxxxxxxx>
To: blinux developers <blinux-develop@xxxxxxxxxx>
Sent: Thursday, March 30, 2000 12:22 PM
Subject: Re: Tracking Events On Another Window
On Tue, 16 Feb 1999, Kieran O' Sullivan wrote:
It's only allowed for a single application to select for
buttonpress events in a window. In the case of the root
window, the window manager already does that before any
app, so you can't do what you want directly. The options
are:
1) disable root window button press in the window manager,
if it's possible (some window managers have an option for that)
2) do a passive grab for button presses in the root window
(XGrabButton)
3) use an existing window manager protocol to tell the
window manager to relay button events to your app (take a
look in teh GNOME wm hints)
4) rethink whether you really need button events from the
root window
--
Alfredo
> I was on about this befor and I tried the suggestion that I got back and
> some of it was good but SelectInput() causes errors when it is applied to
> the root window. The root window seems to think that you are trying to
> change its assributes so your program crashes. The following was
> something I came up with and for some reason it doesn't work the program
> can process its own events but it gets nothing from the root window. I
> have not tried the function with any other window and I know that the root
> window is listening to ButtonPress events.
>
> root_win = RootWindow(display, root_screen); /* Sets a window structure
> equal to root window. There is nothing wrong with this statement because
> I have used it in a QueryTre() function successfully */
>
> /* there is a continuous loop here */
> /* after the program has processed its own events it does the following */
>
> if(!XCheckWindowEvent(display, root_win,
ButtonPressMask|PointerMotionMask, &report2))
>
> {/* nothing to do because there are no events */}
> /* XCheckWindowEvent() is used because it checks the event que and
> if it doesn't find anything it returns False and doesn't balck allowing
> the program to do what it has to do with out waiting for events. */
>
> else
>
> {
>
> printf("\n Something happended ont the root window \n");
>
> switch (report2.type)
>
>
> case ButtonPress:
>
> printf("\nButton Press on root window \n");
>
> break;
>
>
> case MotionNotify:
>
> XQueryPointer (display, win, &rep_root, &rep_child,
>
> &rep_rootx, &rep_rooty, &dx, &dy, &rep_mask);
>
> printf("\nThe pointer was queried %d, %d\n",dx, dy);
>
> break;
>
> default:
>
> break;
>
> } /* End of case for report2 */
>
> } /* Enf of if */
>
> } /* End of While loop that processes all the events */
>
> If anyone can help I would be very grateful.
>
> _____________________________________________________________________
> Kieran O' Sullivan
> http://snet.wit.ie/BlindPenguin
>
>
> --
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>
>
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