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/*
* $Id: JGraphGroupRenderer.java,v 1.1 2005/10/08 13:30:01 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.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.geom.Point2D;
import org.jgraph.JGraph;
import org.jgraph.graph.CellView;
import org.jgraph.graph.DefaultGraphModel;
import org.jgraph.graph.VertexRenderer;
/**
* Renderer for grouped cells, includes '+' '-' to expand/collapse
*/
public class JGraphGroupRenderer extends VertexRenderer {
/**
* Default handle bounds for renderer, '+' or '-'
*/
public static Rectangle handle = new Rectangle(0, 0, 7, 7);
/**
* Specifies whether the current view is a rich text value, and if the image
* should be stretched.
*/
protected boolean isGroup = false;
/**
* Holds the background and foreground of the graph.
*/
protected Color handleColor = Color.white, graphForeground = Color.black;
/**
* Overrides the parent implementation to return the value component stored
* in the user object instead of this renderer if a value component exists.
* This applies some of the values installed to this renderer to the value
* component (border, opaque) if the latter is a JComponent.
*
* @return Returns a configured renderer for the specified view.
*/
public Component getRendererComponent(JGraph graph, CellView view,
boolean sel, boolean focus, boolean preview) {
handleColor = graph.getHandleColor();
graphForeground = graph.getForeground();
isGroup = DefaultGraphModel.isGroup(graph.getModel(), view.getCell());
return super.getRendererComponent(graph, view, sel, focus, preview);
}
/**
* renderer paint method
*/
public void paint(Graphics g) {
super.paint(g);
if (isGroup) {
g.setColor(handleColor);
g.fill3DRect(handle.x, handle.y, handle.width, handle.height, true);
g.setColor(graphForeground);
g.drawRect(handle.x, handle.y, handle.width, handle.height);
g.drawLine(handle.x + 1, handle.y + handle.height / 2, handle.x
+ handle.width - 2, handle.y + handle.height / 2);
if (view.isLeaf())
g.drawLine(handle.x + handle.width / 2, handle.y + 1, handle.x
+ handle.width / 2, handle.y + handle.height - 2);
}
}
/**
* Detect whether or not a point has hit the group/ungroup image
*
* @param pt
* the point to check
* @return whether or not the point lies within the handle
*/
public boolean inHitRegion(Point2D pt) {
return handle.contains(pt.getX(), pt.getY());
}
}
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