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From: karlton@sgi.com (Philip L. Karlton)
Newsgroups: comp.windows.x
Subject: Re: Window visibility question
Message-ID: <7196@odin.corp.sgi.com>
Date: 3 May 90 16:49:59 GMT
References: <206@trwacs.UUCP>
Sender: news@odin.corp.sgi.com
Reply-To: karlton@sgi.com
Organization: Silicon Graphics, System Software Division
Lines: 15

In article <206@trwacs.UUCP>, epstein@trwacs.UUCP (Jeremy Epstein) writes:
|> I'm looking for a way to calculate which portions of a window are
|> visible and which are obscured.  I know that expose events will
|> tell me what I need to redraw, but I need to know when the window
|> becomes obscured, *not* when it is exposed.

I must be in a bit of strange mood to even suggest this, but you could always
just set the background of the window to None and then do a ClearArea of the
entire window requesting exposure events. Of course the true state of
the window
could have changed by the time you process your first Exposure event.

PK
--
Phil Karlton                            karlton@wpd.sgi.com