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From: oster@dewey.soe.berkeley.edu (David Phillip Oster)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Finding the size of the screen under Multifinder/Color QD
Message-ID: <33465@ucbvax.BERKELEY.EDU>
Date: 4 Jan 90 16:06:47 GMT
References: <10139@saturn.ucsc.edu> <9429@hoptoad.uucp> <1102@urbana.mcd.mot.com> <10164@saturn.ucsc.edu>
Sender: usenet@ucbvax.BERKELEY.EDU
Reply-To: oster@dewey.soe.berkeley.edu.UUCP (David Phillip Oster)
Organization: School of Education, UC-Berkeley
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In article <10164@saturn.ucsc.edu> sirkm@ssyx.ucsc.edu (Greg Anderson) writes:
>I know  it's illegal to call InitGraf() from within XCMD's, but can I
>call it from within a DA?

No, you can't call it from a DA either.

>If I cannot call InitGraf() from within my DA, then how can I find the
>size of the screen?

Here is how you access the quickdraw globals from a non-application,
assuming that _some_ application has set them up by calling InitGraf:
(A safe assumption for D.A.s, CDEFs, MDEFs, WDEFs, CDEVs, & FKEYs)


/* QuickDraw - access to globals from a code resource
	brought to you by David Phillip Oster 
	(oster@well.sf.ca.us  or oster@dewey.soe.berkeley.edu)
	You may use this as you see fit.
 */
typedef struct QuickDraw {
	LongInt	randSeed;
	BitMap	screenBits;
	Cursor	arrow;
	Pattern	dkGray;
	Pattern	ltgray;
	Pattern	gray;
	Pattern	black;
	Pattern	white;
	GrafPtr	thePort;
} QuickDraw;


/* DisableSelf - this is from a CDEF I wrote, it dims the control.
 */
DisableSelf(ch)ControlHandle ch;{
	QuickDraw *qd;
	Rect r;

	qd = (QuickDraw *) ( *(Byte **) CurrentA5 - (sizeof(QuickDraw) -
sizeof(GrafPtr)) );
	r = (**ch).contrlRect;
	PenMode(patBic);
	PenPat(qd->gray);	/* <-- Note, a QD global! */
	PaintRect(&r);
	PenNormal();
}

--- David Phillip Oster            --  No, I come from Boston. I just work
Arpa: oster@dewey.soe.berkeley.edu --  in cyberspace.
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