code: public void viewLocationDidChange (int dx, int dy)
      {
          // let our media know
          for (int ii = 0, ll = _media.size(); ii < ll; ii++) {
              _media.get(ii).viewLocationDidChange(dx, dy);
          }
      }
docs: Called by a {@link VirtualMediaPanel} when the view that contains our media is scrolled.
  
  @param dx the scrolled distance in the x direction (in pixels).
  @param dy the scrolled distance in the y direction (in pixels).