Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cwjcc!tut.cis.ohio-state.edu!bloom-beacon!ATHENA.MIT.EDU!kit
From: kit@ATHENA.MIT.EDU (Chris D. Peterson)
Newsgroups: comp.windows.x
Subject: Re: common routines
Message-ID: <8902091719.AA02641@DORA.MIT.EDU>
Date: 9 Feb 89 17:19:23 GMT
References: <3008@stiatl.UUCP>
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
Lines: 29


> If I need the same code in several types of widgets (eg, IgnoreChar -
> a routine to throw away unwanted characters), do I need a static copy
> of this in each widget.c file, or can I just stick a non-static version
> in a common library?

I suppose that you could declare the function as external in the widget,
then add it to the widget's action table.  This should cause everything
to work correctly.  I will leave it to you to figure out how to make sure
that the function gets linked into the application.

If you are writing an application this is much easier, you just need to
add the action routine to your application's AppContext using XtAppAddActions().

The Intrinsics search for an action routine in widget, and then up through all
of its superclasses.  If it finds the routine it stops searching and uses the
one that it found.  If it still hasn't found it after searching through all of
the widget's superclasses it then looks for any action routines that the
application has defined.

						Chris D. Peterson     
						MIT X Consortium /
						Project Athena 

Net:	kit@athena.mit.edu		
Phone: (617) 253 - 1326			
USMail: MIT - Room E40-321
	77 Massachusetts Ave.		
	Cambridge, MA 02139