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From: converse@expo.lcs.mit.EDU
Newsgroups: comp.windows.x
Subject: Re: unexpected XtIsWidget behavior
Message-ID: <9103081724.AA23784@excess.lcs.mit.edu>
Date: 8 Mar 91 17:24:50 GMT
References: <9103081459.AA09602@tilde>
Sender: daemon@athena.mit.edu (Mr Background)
Organization: X Consortium, MIT Laboratory for Computer Science
Lines: 19


> XtIsWidget does not seem to recognize Motif gadgets as widgets!  

That's because they're not widgets.


> Despite the fact that gadgets use the same type structure (their creation 
> routines return Widget) this check fails. It must look for the window 
> gadgets don't create or something.  Why is this?

It checks to see whether or not the widget is equal to or is a subclass 
of WidgetClass.  Objects, or as they seem to be known in Motif-land, 
gadgets, are not subclasses of WidgetClass.


> We were using XtIsWidget to check creation of every widget we create for
> general debugging purposes. 

You need to read the interface definition for XtIsWidget.