Re: An odd DrawingArea problem

[Peter Krueger <pkrueger appss de>]

On Sat, 1 May 2004 dhaude physnet uni-hamburg de wrote:
> Hi folks,
>
> imagine a GtkDrawingArea that doesn't have an expose_event
> callback connected. Assume something has been drawn on this area.
> If the DrawingArea is (partially) hidden under some other window
> and then exposed again, nothing will happen on the freshly
> exposed parts of the window, will it?
>
> But it will: the exposed parts get painted in a light grey (the
> typical gtk background color). There seems to be some underlying
> expose event handler that does it, otherwise there would be stuff
> left of the window that formerly obstructed the DrawingArea. My
> question is: How can this be stopped?
Hi Daniel!
When an expose event occurs GTK will clear the affected region with the
background color or background pixmap right before your applications
expose callback is called. You can change this behaviour with
gdk_window_set_back_pixmap() when you set NULL as pixmap.

Regards,
                     Peter
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