Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!usc!srhqla!quad1!carl
From: carl@quad1.quad.com (Carl Priddy)
Newsgroups: comp.windows.x.motif
Subject: Re: Multiple callbacks...
Summary: multiple callbacks
Keywords: This then that...
Message-ID: <14288@gouda.quad.com>
Date: 6 Aug 90 17:11:09 GMT
References: <7@gauss.mmlai.UUCP>
Organization: Quadratron Systems Inc, Thousand Oaks Ca
Lines: 27

In article <7@gauss.mmlai.UUCP>, burzio@mmlai.UUCP (Tony Burzio) writes:
> Does anyone have a short example of how to register
> more than one callback for a single event?  

Well, I am not sure if your problems are caused by the lack of multiple
callbacks, but as I found out by accident just recently, the use of
XtAddCallback() does just what the name implies: it ADDs a callback. That
is, if you enter a loop which calls XtAddCallback() 'n' times with the
same  widget and arguments, when the event occurs it will invoke that callback
'n' times.
-- example --
Widget wl;
VOID cbrtn();
int i;
..
..
	/*
	 * assume that wl is a pushbutton 
	*/
	for (i = 0; i < 5; i++)
		XtAddCallback(wl,XmNactivateCallback, cbrtn,i);

...
Now, when the button is activated, there will be 5 calls to cbrtn(), with
then numbers 0-4 passed as client data.

carl.