code: public boolean isInState(JComponent c) {
          if (c != null && c.getParent() != null) {
              SeaGlassScrollBarUI ui = (SeaGlassScrollBarUI) ((JScrollBar) c.getParent()).getUI();
  
              if (ui.getIncreaseButton() == c) {
                  return true;
              }
          }
  
          return false;
      }
docs: {@inheritDoc}