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From: CXT105@psuvm.psu.edu (Christopher Tate)
Newsgroups: comp.sys.mac.programmer
Subject: Getting Rid of the Menu Bar (again!)
Message-ID: <91021.231449CXT105@psuvm.psu.edu>
Date: 22 Jan 91 04:14:49 GMT
Organization: Penn State University
Lines: 29

I *know* this has been batted around before, so if someone can just take
pity on a poor helpless programmer and tell me the vital nitty gritty,
I'll be much obliged....

How do I make the menu bar go away, so that I can draw where it usually
sits?  Specifically, I want to open a window the size of the screen, and
obscure the menu bar with it.  I'm writing a screen saver (yes, I know;
the last thing we need is *another* screen saver, but there are legal
reasons for this project), and the window has to be put up (and the menu
bar taken care of) from within a trap patch.  I've gotten the window to
display beautifully, but the menu bar stays visible.

As I recall, getting rid of the menu bar involves setting the low-memory
global MBarHeight to zero, and calling DrawMenuBar().  There's more to it
than that, though, because I'm *doing* that, and it doesn't work!  Do I
need to set the clip region of the Window Manager GrafPort to include the
menu bar?  That sounds pretty hairy....

I'm using THINK C, so my globals are referenced off of A4 instead of A5.
Is this going to cause problems?  (I'm saving and restoring ALL registers
that I use in the trap patches, and I'm *NOT* tail patching anything!)
The traps I'm patching are _SystemEvent (to look for events that will cancel
or delay the screen-saving) and _SystemTask (to get periodic time without
all the hassle of VBL tasks).

-------
Christopher Tate                   |    somewhere i have never travelled,
cxt105@psuvm.psu.edu               |    gladly beyond any experience,
 ..!psuvax1!psuvm.bitnet!cxt105    |    your eyes have their silence.