Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!heron.cis.ohio-state.edu!mershon
From: mershon@heron.cis.ohio-state.edu (Stuart Mershon)
Newsgroups: comp.windows.x
Subject: Scrollbar widget help needed ...
Message-ID: <35812@tut.cis.ohio-state.edu>
Date: 17 Feb 89 17:54:49 GMT
Sender: news@tut.cis.ohio-state.edu
Reply-To: <mershon@cis.ohio-state.edu>
Organization: Ohio State University Computer and Information Science
Lines: 26


   I am a novice X11R3 programmer looking for some help in dealing with the
scrollbar widget.  I am trying to use the callback procedure specified by
XtNscrollProc to nudge the thumb a little bit one way or another, depending 
upon which mouse button was pressed.  In order to do this, I have tried to
use XtGetValues, which doesn't want to cooperate.  So, I stepped back to 
the following:

    float top,shown;
 

    top = 0.5;
    shown = -1.0;
    XtScrollBarSetThumb(scrl[call_id],top,shown);

    XtSetArg( arg[0], XtNtop, &top );
    XtGetValues( scrl[call_id], arg, ONE );

   Even though my scrollbar shows the thumb in the proper position, top
always comes back from XtGetValues with a zero value.  Can anyone out there
show me the error of my ways.  Any help is greatly appreciated.

Thanks,
       ... Jeb

mershon@cis.ohio-state.edu