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From: corry@eniac.seas.upenn.edu (Chris Corry)
Newsgroups: comp.windows.x
Subject: Calling Actions from Actions
Message-ID: <38437@netnews.upenn.edu>
Date: 28 Feb 91 00:51:51 GMT
Sender: news@netnews.upenn.edu
Reply-To: corry@eniac.seas.upenn.edu (Chris Corry)
Organization: University of Pennsylvania
Lines: 57


* PLEASE, PLEASE HELP *

   I've got a problem that I cannot think of an acceptable solution to. Let
me preface this by saying that I DO NOT WANT TO SUBCLASS THE ATHENA TEXT
WIDGET (unless I absolutely have to, of course). That said, here we go.

   I'm writing a hypertext application with links embedded in the text of a
normal Xaw text widget. The link is delimited by special characters (EX:
"some text << link >> and so on"). I need a way to capture the backspace key
(easy enough, write an action and place it in the translation table), check to
see if the character about to be erased is a link (easy enough using the 
programmatic interface supplied with the text widget), and if it IS, jump
to one of my functions without propogating the event to "delete-previous-char"
(which is really function DeleteBackwardChar). However, if the character about
to be erased IS NOT part of the link I want to let it go through.

   What I've Tried:
     I didn't think it would work but I wrote an action (MyDeleteChar) and
replaced the "delete-previous-char" action with it. Then I tried to directly
call DeleteBackwardChar (found in the private widget code) from my action if
needed. As you might expect my link ended like this:

>%make -fhypermake
>cc    -c utils.c -o utils.o
>cc    -c filemenu.c -o filemenu.o
>cc    -c optmenu.c -o optmenu.o
>cc    -c fntmenu.c -o fntmenu.o
>cc    -c athmenu.c -o athmenu.o
>cc    -c buttons.c -o buttons.o
>cc    -c doc.c -o doc.o
>cc    -c lists.c -o lists.o
>cc    -c engine.c -o engine.o
>cc    -c smanage.c -o smanage.o
>cc    -c hypertex.c -o hypertex.o
>cc utils.o filemenu.o optmenu.o fntmenu.o athmenu.o buttons.o doc.o lists.o en
>gine.o smanage.o hypertex.o -o hypertex libfwf.a libDir.a -lXaw -lXmu -lXt -lX
>11
>ld: Undefined symbol
>   _DeleteOrKill
>make: *** [hypertex] Error 2
>%

     The only other thing I can think of is subclassing the widget and
rewriting DeleteBackwardChar but, although I've become fairly proficient at
X, I've never written a widget and I can't really afford the time right now.

PLEASE REPLY BY POSTING OR MAIL -- ANY HELP WILL BE GREATLY APPRECIATED!!!
                                                    =======

Thanks

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