Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!unmvax!pprg.unm.edu!hc!lll-winken!ames!oliveb!felix!dhw68k!thecloud
From: thecloud@dhw68k.cts.com (Ken McLeod)
Newsgroups: comp.sys.mac.programmer
Subject: Re: CDEF's
Message-ID: <19324@dhw68k.cts.com>
Date: 29 Jan 89 20:15:51 GMT
References: <5631@paris.ics.uci.edu>
Reply-To: thecloud@dhw68k.cts.com (Ken McLeod)
Organization: Wolfskill & Dowling residence; Anaheim, CA (USA)
Lines: 66

In article <5631@paris.ics.uci.edu> Petey O'Leary <poleary%bonnie.ics.uci.edu@orion.cf.uci.edu> writes:
>
>	I am trying to code a simple CDEF that is exactly like the standard
>push-button, only with square instead of rounded corners.  The CDEF that
>I have functions except that no "tracking" seems to be done when I
>click in the control.  By this I mean that when I click in the button,
>it is not inverted and it seems that action takes place on the mouse-
>down rather than the mouse-up, like a standard push-button.

 It sounds like a CDEF may be overkill for what you want to do. Here's
a simple function I use for tracking rectangular buttons (replace the
calls to InvertRect() with InvertOval() if you want a circular button,
and so on).
/*===================================================================*/
short
TrackButton ()
/* called when we determine that a mouseDown has occurred in the rect
   of our 'pseudo-button'; handles button tracking until the mouse is
   up, then returns 1 (true) if the mouse was released inside the button,
   or 0 (false) if released outside the button. */
{
	short	itemtype, struck;
	Handle	itemhand;
	Rect	itemrect;
	Point	mPt;

	/* set up 'itemrect' to be your button's rectangle here; you could
	   also pass it as a parameter to this function if you wanted */
	InsetRect(&itemrect, 1, 1);
	InvertRect(&itemrect);
	struck = 1;							/* used to track inverted state */
	while (Button())	{
		GetMouse(&mPt);
		if (PtInRect(mPt, &itemrect))	{
			if (!struck)	{
				InvertRect(&itemrect);
				struck = !struck;
			}
		}
		else if (!(PtInRect(mPt, &itemrect)))	{
			if (struck)	{
				InvertRect(&itemrect);
				struck = !struck;
			}
		}
	}
	if (struck)	{
		/* mouse was released in button box */
		InvertRect(&itemrect);
		return(1);
	}
	else return(0);
}

/*===================================================================*/

Hope that helps...
-ken



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