Path: utzoo!attcan!uunet!husc6!bloom-beacon!EXPO.LCS.MIT.EDU!kit
From: kit@EXPO.LCS.MIT.EDU (Chris D. Peterson)
Newsgroups: comp.windows.x
Subject: Re: widget name
Message-ID: <8904181920.AA20845@expo.lcs.mit.edu>
Date: 18 Apr 89 19:20:55 GMT
References: <8904122130.AA02620@hara.fctunl.rccn.pt>
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
Lines: 24


>       I am working on an application that uses numerous widgets.  For one
> of the callback functions of a CommandWidget, I need to know the name
> of the widget that called the callback.  How can I do this?

> Have your callback routine do:

>         1) an XtGetValues on the XtNlabel argument (slow but safe)

This won't work, the default is to have the label use the name,
but if someone adds the line "*Command*label: foo" to their resource
file this will screw you over.  Label and Name are NOT the same.

>         2) use the value of w->core.name.

This breaks abstraction barriers, but works.  The best thing is to 
write your own XtWidgetToName() function, so that you can convert
over when this function gets added to the Intrinsics.  Unfortunatly 
until this function gets added to the Instrincs there is no way to 
do this cleanly.


                                                Chris D. Peterson
                                                MIT X Consortium