package com.softwarematch.workflow;import java.awt.Component;import java.awt.event.MouseEvent;import java.awt.geom.Point2D;import java.awt.geom.Rectangle2D;import javax.swing.event.MouseInputAdapter;import org.jgraph.JGraph;import org.jgraph.graph.CellView;import org.jgraph.graph.DefaultGraphModel;/** * Mananges the folding and unfolding of groups */public class JGraphFoldingManager extends MouseInputAdapter {	/**	 * Called when the mouse button is released to see if a collapse or expand	 * request has been made	 */	public void mouseReleased(MouseEvent e) {		if (e.getSource() instanceof JGraph) {			final JGraph graph = (JGraph) e.getSource();			CellView view = getGroupByFoldingHandle(graph, e.getPoint());			if (view != null) {				if (view.isLeaf())					graph.getGraphLayoutCache().expand(							new Object[] { view.getCell() });				else					graph.getGraphLayoutCache().collapse(							new Object[] { view.getCell() });			}			e.consume();		}	}	/**	 * Called when the mouse button is released to see if a collapse or expand	 * request has been made	 */	public static CellView getGroupByFoldingHandle(JGraph graph, Point2D pt) {		CellView[] views = graph.getGraphLayoutCache().getCellViews();		for (int i = 0; i < views.length; i++) {			Point2D containerPoint = graph.fromScreen((Point2D) pt.clone());			if (views[i].getBounds().contains(containerPoint.getX(), containerPoint.getY())) {				Rectangle2D rectBounds = views[i].getBounds();				containerPoint.setLocation(containerPoint.getX()						- rectBounds.getX(), containerPoint.getY()						- rectBounds.getY());				Component renderer = views[i].getRendererComponent(graph,						false, false, false);				if (renderer instanceof JGraphGroupRenderer						&& DefaultGraphModel.isGroup(graph.getModel(), views[i]								.getCell())) {					JGraphGroupRenderer group = (JGraphGroupRenderer) renderer;					if (group.inHitRegion(containerPoint)) {						return views[i];					}				}			}		}		return null;	}}