Newsgroups: comp.windows.x
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From: mouse@lightning.mcrcim.mcgill.EDU (der Mouse)
Subject: Re:  Missing Exposures
Message-ID: <9104110019.AA00976@lightning.McRCIM.McGill.EDU>
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Date: 11 Apr 91 00:19:12 GMT
Lines: 32

> I have a main window (call in MAIN_WINDOW) that fills my entire screen.

> I have two other visible windows, children of MAIN_WINDOW, that do
> not overlap each other (call then WINDOW_1, WINDOW_2).

> I create a third window (call it ON_TOP) a child of MAIN_WINDOW and
> set its x,y coordinate so that when it is mapped, it is on top and
> partially obscures WINDOW_1 and WINDOW2.

> When I XDestroy ON_TOP, I'm not getting Expose/Visibility Events for
> WINDOW_1 and/or WINDOW_1.

(..._2.  I also assume you do in fact map ON_TOP, and that the stacking
order is such that it is in front of WINDOW_1 and WINDOW_2.  I also
assume that you do the XSelectInput calls before you destroy ON_TOP.)

> 3) All other [windows: except MAIN_WINDOW] are set as: XSelectInput
> (the_display, ?which_window?, ButtonPressMask | ButtonReleaseMask |
> OwnerGrabButtonMask | EnterWindowMask | LeaveWindowMask |
> ExposureMask | VisibilityChangeMask);

> Does anybody have any suggestions as to why I'm not getting Expose
> Events??

Your server could be providing a backing-store attribute of WhenMapped
for you.  (This doesn't explain the lack of VisibilityNotify events; I
have no guesses there, except for postulating bugs.)

					der Mouse

			old: mcgill-vision!mouse
			new: mouse@larry.mcrcim.mcgill.edu