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Newsgroups: comp.sys.mac.programmer
Subject: Re: ICONs as buttons in a dialog.
Message-ID: <1CE00001.or5i24@tbomb.ice.com>
Date: 15 Feb 91 15:07:10 GMT
Reply-To: time@ice.com
Organization: ICE Engineering, Inc.
Lines: 54
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In article <1392@gertie.osc.edu>, spencer@cgrg.ohio-state.edu (Stephen N. Spencer) writes:
> I've created a dialog box which has the standard 'Cancel' and 'OK' buttons,
> and have five ICON resources that I'd like to use as buttons.  I can display
> them in the dialog box, and I get dialog events when I click on them (it's a
> modeless dialog box...) but they don't invert or anything like that.
> 
> Will I have to handle the inversion of the appropriate area of the screen
> (the clicked-upon ICON) myself or is there some other method for doing this?

You need to use ICN# resources, with the icon mask data.
Example:

DrawIcon(myWindow, myIcon)
WindowPtr	myWindow;
ICONCtl		*myIcon;
{
	/* Cut "hole" into gray (or other) background for icon transfer... */
	CopyBits(&myIcon->maskbits, &myWindow->portBits, &myIcon->maskbits.bounds,
				&myIcon->bounds, srcBic, NULL);
	/* Copyt the icon */
	CopyBits(&myIcon->iconbits, &myWindow->portBits, &myIcon->iconbits.bounds,
				&myIcon->bounds, srcOr, NULL);
	/* Check for "dim" icon. */
	if (icon_list->active == 0) {
		PenMode(patBic);
		PenPat(qd.gray);
		PaintRect(&icon_list->bounds);
		PenNormal();
		}
	}
	
HiliteICON(myWindow, theicon)
WindowPtr	myWindow;
ICONCtl		*theicon;
{
	if (theicon != NULL) {
		if (theicon->showing) {
			/* Invert the icon using it's mask. */
			CopyBits(&theicon->maskbits, &myWindow->portBits, &theicon->maskbits.bounds,
						&theicon->bounds, srcXor, NULL);
			}
		}
	}

Ignore my silly data structures. The iconbits are the first 128 bytes
of the ICN# resource and the maskbits are the second 128 bytes.

tim.

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