davej@sp31.csrd.uiuc.edu (David J. Jablonowski) (02/20/91)
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. This is not for refreshing; I am well aware of the Expose Callbackbacks and the accumulation of Regions. Ii seems that I can get close by going thru a bunch of yoga involving getting the scrollbars, thier dimensions, their values, the size of the scrolled window itself ..., and doing some calculations. But it seems I still seems that I am missing some 'margins' or something. Is there a nice way to determine this info ?
bobm@hpcvlx.cv.hp.com (Bob May) (02/21/91)
> 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