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/*
* $Id: JGraphFoldingManager.java,v 1.2 2006/05/11 17:11:25 david Exp $
* Copyright (c) 2001-2005, Gaudenz Alder
*
* All rights reserved.
*
* This file is licensed under the JGraph software license, a copy of which
* will have been provided to you in the file LICENSE at the root of your
* installation directory. If you are unable to locate this file please
* contact JGraph sales for another copy.
*/
package com.jgraph.example;
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;
}
}
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