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From: bobm@hpcvlx.cv.hp.com (Bob May)
Newsgroups: comp.windows.x.motif
Subject: Re: Scrolled Window: Area Size
Message-ID: <110630035@hpcvlx.cv.hp.com>
Date: 20 Feb 91 16:42:01 GMT
References: <1991Feb19.213852.3289@csrd.uiuc.edu>
Organization: Hewlett-Packard Co., Corvallis, OR, USA
Lines: 19


>   I have a Scrolled WIndow with a scrollingPolicy of AUTOMATIC and a
> scrollBarDisplayPolicy of AS_NEEDED. The work area of this Widget is a
> Drawing Area. What I need to do is to determine, at arbitrary times, the
> exact rectangular regtion of the Drawing Area that is visible thru the
> viewing area of the Scrolled Window. This means I need the width and height
> of this viewing area as well as the coordinates of the Drawing Area that
> appear.
> Is there a nice way to determine this info ?

   Try getting the widget ID contained in the Scrolled Window's XmNclipWindow
   resource, then do a GetValues on the width and height of that widget.
   Should be just what you need.
   
   Bob May
   Hewlett-Packard
   Interface Technology Operation
   bobm@hpcvlx.cv.hp.com