NAME

       Scroller, HScroller, VScroller - scrolling an interactor

SYNOPSIS

       #include <InterViews/scroller.h>

DESCRIPTION

       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.

PUBLIC OPERATIONS

       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.

X DEFAULTS

       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.

SEE ALSO

       Interactor(3I), Perspective(3I)

InterViews                                        15 June 1987                                      Scroller(3I)