graphportview.java

JGraph扩展应用。自定义Renderer,自定义视图View实现自定义工作流控件

/*
 * @(#)MyPortView.java 3.3 23-APR-04
 * 
 * Copyright (c) 2001-2005, Gaudenz Alder All rights reserved.
 * 
 * See LICENSE file in distribution for licensing details of this source file
 */
package flow.graph.gui.graph.item;

import java.awt.Graphics;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.net.URL;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JScrollPane;

import org.jgraph.JGraph;
import org.jgraph.graph.CellViewRenderer;
import org.jgraph.graph.DefaultCellViewFactory;
import org.jgraph.graph.DefaultGraphModel;
import org.jgraph.graph.Port;
import org.jgraph.graph.PortRenderer;
import org.jgraph.graph.PortView;

import flow.graph.gui.graph.GraphManager;

public class GraphPortView extends PortView {
	protected static ImageIcon portIcon = new ImageIcon(GraphManager.class.getResource("images/port.gif"));

	protected static MyPortRenderer renderer = new MyPortRenderer();

	public GraphPortView(Object cell) {
		super(cell);
	}

	/** 
	* Returns the bounds for the port view. 
	*/
	public Rectangle2D getBounds() {
		if (portIcon != null) {
			Point2D pt = (Point2D) getLocation().clone();
			int width = portIcon.getIconWidth();
			int height = portIcon.getIconHeight();
			Rectangle2D bounds = new Rectangle2D.Double();
			bounds.setFrame(pt.getX() - width / 2,
							pt.getY() - height / 2,
							width,
							height);
			return bounds;
		}
		return super.getBounds();
	}

	public CellViewRenderer getRenderer() {
		return renderer;
	}

	public static class MyPortRenderer extends PortRenderer {

		public void paint(Graphics g) {
			portIcon.paintIcon(this, g, 0, 0);
		}

	}

}