return getScrollableUnitIncrement(visibleRect, orientation, direction);
int block; if (orientation == SwingConstants.VERTICAL) block = visibleRect.height; else block = visibleRect.width; return block;
  public int getScrollableBlockIncrement(Rectangle visibleRect,                                         int orientation, int direction)  {    return getScrollableUnitIncrement(visibleRect, orientation, direction);  }