panHandler = new BoundedDragPanHandler(null);
panHandler = new BoundedEdgePanHandler();
    private void init()    {        env = BrowserEnvironment.getInstance();        setBackground(new Color(192,192,192));        layoutMap = new HashMap();        footprint = new Rectangle2D.Double(0,0,0,0);                // here we disable zoom/pan (TODO: save for later, reinstate on mode)        removeInputEventListener(getZoomEventHandler());        removeInputEventListener(getPanEventHandler());                panHandler = new BoundedDragPanHandler(null);        addInputEventListener(panHandler);    }