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From: vojta@skippy.berkeley.edu (Paul Vojta)
Newsgroups: comp.windows.x
Subject: Re: Scrolling a Viewport Widget through Software
Keywords: athena widget
Message-ID: <26821@agate.BERKELEY.EDU>
Date: 31 Jul 89 19:39:17 GMT
References: <15135@duke.cs.duke.edu>
Sender: usenet@agate.BERKELEY.EDU
Reply-To: vojta@skippy.UUCP (Paul Vojta)
Distribution: usa
Organization: Math Dept., UC Berkeley
Lines: 37

In article <15135@duke.cs.duke.edu> pusateri@lear.cs.duke.edu (Thomas J. Pusateri) writes:
>
>     Has anyone figured out how to scroll an athena viewport widget
>from within your program?  I have a list widget that is fairly long
>inside a viewport and would like to be able to type a key and have
>the list widget scroll down automatically to the place in the sorted
>list starting with that letter typed.
>
>     I thought I might be able to use XtScrollbarSetThumb but I don't
>know the widget ID of the actual scrollbar in the viewport.
>
>Thanks for any help
>
>Tom Pusateri
>National Biomedical Simulation Resource
>Duke University Medical Center
>
>pusateri@nbsr.mc.duke.edu

How about the following:
	1.  Use XtGetValues to get XtNwidth and XtNheight for the viewport
	    widget and XtNx and XtNy for the child widget (remembering that
	    then (-x,-y) will be the upper left viewable pixel);
	2.  Use XtNameToWidget(vport_widget, "horizontal") and
	    XtNameToWidget(vport_widget, "vertical") to get the widgets
	    for the horizontal and vertical scrollbars;
	3.  Use XtCallCallbacks(x_bar, XtNscrollProc, x) and
	    XtCallCallbacks(y_bar, XtNscrollProc, y) to set the scrollbars
	    in the desired positions.

I understand that step 2 above is not currently officially blessed, but that
there was some discussion previously about putting the names "vertical"
and "horizontal" in the documentation to make it legit.

Hope this helps.

--Paul Vojta, vojta@math.berkeley.edu