Re: gdk_window_at_pointer and foreign windows

["Brian J. Tarricone" <bjt23 cornell edu>]

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On Tue, 20 Feb 2007 11:37:59 +0000 Kevin O'Riordan wrote:

> Thanks for the reply. I was helping someone look at a problem they
> were having with embedding a native application in the Eclipse
> framework on Linux/GTK. It works fine for the most part (using
> GtkSocket to reparent native application windows to the SWT control
> for the view), there's just a minor problem where dragging views over
> the native application view behaves as if you were dragging views
> outside the Eclipse window. I traced it down to the
> OS.gdk_window_at_pointer call returning 0 rather than the window
> handle when the mouse is over the native application view.

This is somewhat messy, but you could check for a NULL return to
gdk_window_at_pointer(), and then use XQueryTree() on the toplevel
window (the one that you used gdk_window_foreign_new() on) to find all
the children of that window, and call gdk_window_foreign_new() on those
as well.  At least that way gdk will always be able to see them.  There
might be a way to grab new X windows as they appear as well, but I'm
not sure about that without digging a bit deeper.

        -brian

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