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       Scroller, HScroller, VScroller - scrolling an interactor


       #include <InterViews/scroller.h>


       A  scroller  is  an interactor that manipulates the perspective of another interactor.  It
       contains a bar whose position and  size  reflect  the  current  origin  and  size  in  the
       interactor's  perspective.   Clicking  and  dragging in the scroller modifies the attached
       interactor's perspective.  VScroller is a class for defining vertical scrollers, HScroller
       for horizontal scrollers.


       HScroller(Interactor*, int size = 0)
       VScroller(Interactor*, int size = 0)
              Create  a  scroller  of a given size (height for a horizontal scroller, width for a
              vertical scroller).  A zero size means to use the default size.

       virtual void Update()
              Redisplay the scroller to reflect a change in the interactor's perspective.


       The ``syncScroll'' resource specifies whether the scroller should  work  in  real-time  or
       not.   When synchronized scrolling is employed the interactor scrolls synchronously as the
       scroller's bar is dragged; otherwise the bar's outline follows the mouse during  dragging,
       and the interactor is scrolled only after the user stops dragging the bar.  Scrollers will
       scroll synchronously if their syncScroll resource is set to ``on'' or ``true.''  The state
       of the syncScroll attribute can be toggled temporarily by holding down the ``control'' key
       while the scroller is manipulated.


       Interactor(3I), Perspective(3I)