Path: utzoo!utgpu!water!watmath!clyde!rutgers!sri-unix!ctnews!pyramid!voder!apple!han
From: han@apple.UUCP (-- Byron B. Han --)
Newsgroups: comp.sys.mac
Subject: Re: Need help with drawing icons
Message-ID: <7237@apple.UUCP>
Date: 21 Jan 88 16:28:39 GMT
References: <6500008@hpindda.HP.COM>
Reply-To: han@apple.UUCP (-- Byron B. Han --)
Organization: Communication Tools Group - Apple Computer, Inc.
Lines: 28

In article <6500008@hpindda.HP.COM> atchison@hpindda.HP.COM (Lee Atchison) writes:
>
>What I am trying to do is draw icons, invert them (using the icon mask,
>like the finder does), and erase them.  I want to be able to do this both
>in a window and on the desktop (like the disk icons, and the trashcan
>in the finder).
>
>Now, for drawing on the desktop, I used the following:

This is not recommended.  According to the "MultiFinder Development Package
Release Note" (p. 4) "The window manager port is generally off limits.  It
belongs strictly to the Window Manager.  Yes this means that applications 
cannot draw on the desktop.  Consider the call GetWMGRPort() to be for 
amusement only and certainly read-only purposes.  The fabled DESKHOOK,
a low-memory vector which allowed applications to draw on the desktop, has 
been eliminated. Applications that use DESKHOOK will not function as expected."

DESKHOOK was a low memory vector that would (described in IM-I p. 282, 288)
be called when a click in the desktop was registered and/or when the
the desktop is to be redrawn. 



-- 
------------------------ Byron Han,  Communications Tool ----------------------
     Apple Computer, Inc.  20525 Mariani Ave, MS 27Y  Cupertino, CA 95014
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