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From: anson@elrond.CalComp.COM (Ed Anson)
Newsgroups: comp.sys.mac.hypercard
Subject: Re: Update events in HyperCard?
Message-ID: <1397@elrond.CalComp.COM>
Date: Mon, 9-Nov-87 10:48:46 EST
Article-I.D.: elrond.1397
Posted: Mon Nov  9 10:48:46 1987
Date-Received: Wed, 11-Nov-87 06:11:44 EST
References: <1394@elrond.CalComp.COM> <6638@apple.UUCP>
Reply-To: anson@elrond.UUCP ()
Distribution: na
Organization: Calcomp Display Products Division, Hudson, NH, USA
Lines: 22
Keywords: XCMD, Update

In article <6638@apple.UUCP> hyperbug@apple.UUCP (Keith Rollin) writes:
>The technique I use is to open a Picture, draw to it, post it to the 
>Clipboard (be sure to to a ZeroScrap first! I forgot and had many weird
>things happen), and then do a "SendCardMessage('type "V" with commandkey')"

Yes, that gets the graphic onto (and into) the card, but it doesn't solve
my problem.  I guess I need to be more clear:

If my objective were to produce a static graphic on a card, I wouldn't even
bother with an XCMD.  There are simpler ways to do that.  My XCMD wants to
be called repeatedly, under various conditions, to dynamically update the
display over a portion of the card.  The only condition I don't know how to
handle is when another window disappears from over the card, leaving a hole 
in my special image.

Until I find the answer to this one, I have to pursue some means other than
HyperCard to implement my application.  Too bad... HyperCard does 99% of
what I need.
-- 
=====================================================================
   Ed Anson,    Calcomp Display Products Division,    Hudson NH 03051
   (603) 885-8712,      anson@elrond.CalComp.COM