Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!cs.utexas.edu!uunet!mcvax!kth!draken!tut!santra!kampi.hut.fi!jmunkki
From: jmunkki@kampi.hut.fi (Juri Munkki)
Newsgroups: comp.sys.mac.programmer
Subject: Re: TrackButton()
Message-ID: <23257@santra.UUCP>
Date: 27 Jun 89 22:19:47 GMT
References: <128@dbase.UUCP> <23239@santra.UUCP> <2509@internal.Apple.COM>
Sender: news@santra.UUCP
Reply-To: jmunkki@kampi.hut.fi (Juri Munkki)
Organization: Helsinki University of Technology, Finland
Lines: 54

In article <2509@internal.Apple.COM> lsr@Apple.COM (Larry Rosenstein) writes:
>In article <23239@santra.UUCP> jmunkki@kampi.hut.fi (Juri Munkki) writes:
>> What if the user quickly presses and releases the mouse button on the
>> control and then moves the mouse away from the button area. Your routine
>> does not detect this. You should use GetNextEvent to find when the button
>
>The example code called StillDown which seems to be the right thing to do. 
> StillDown returns FALSE if the event queue contains a mouseUp event, 
>which would handle the case you describe.  (You can also call WaitMouseUp, 
>which does the same thing and removes the mouseUp from the event queue.)

You still get the wrong mouse coordinates if you use stilldown/getmouse.
With GetNextEvent you get the coordinate where the mouseup happened. GetMouse
just tells you the current mouse locations. These are not the same thing.

>Perhaps you can elaborate on why this does not work with QuicKeys; the 
>code does take into account mouseUp events.

Ok. Here's the code I used in my Mandelbrot DA.

/* A general purpose pseudo-button
** handler. Give it a rect and it
** handles the rectangle as a button
** and returns true if the button was
** hit.
*/
int	ClickRect(box)
Rect	*box;
{
register	int	hilited=0,where;
		Point	spot;
	
	while(StillDown())
	{	GetMouse(&spot);
		where=PtInRect(spot,box);
		if(where!=hilited)
		{	hilited=where;
			InvertRect(box);
		}
	}
	if(hilited) InvertRect(box);

	return hilited;
}
Now take a look at the code that was posted. There are some very minor
differences, but basically it's the same program. I don't know how
QuicKeys is supposed to work, but defining a click in the box does
not produce the expected results.


_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
|     Juri Munkki jmunkki@hut.fi  jmunkki@fingate.bitnet        I Want   Ne   |
|     Helsinki University of Technology Computing Centre        My Own   XT   |
^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^