followurltool.java

开源（Open Source）项目JHotDraw的文档和源程序

/*
 * @(#)FollowURLTool.java 5.2
 *
 */

package CH.ifa.draw.samples.javadraw;

import javax.swing.*;
//import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.net.*;
import java.util.*;
import CH.ifa.draw.framework.*;
import CH.ifa.draw.standard.AbstractTool;

class FollowURLTool extends AbstractTool {
     private JApplet         fApplet;

     FollowURLTool(DrawingView view, JApplet applet) {
        super(view);
        fApplet = applet;
     }

    /**
     * Handles mouse move events in the drawing view.
     */
    public void mouseMove(MouseEvent e, int x, int y) {
		String urlstring = null;
	    Figure figure = drawing().findFigureInside(x,y);
	    if (figure != null)
		    urlstring = (String) figure.getAttribute("URL");
	    if (urlstring != null)
	        fApplet.showStatus(urlstring);
	    else
	        fApplet.showStatus("");
    }

    /**
     * Handles mouse up in the drawing view.
     */
    public void mouseUp(MouseEvent e, int x, int y) {
	    Figure figure = drawing().findFigureInside(x, y);
	    if (figure == null)
	        return;
	    String urlstring = (String) figure.getAttribute("URL");
	    if (urlstring == null)
	        return;

	    try {
    	    URL url = new URL(fApplet.getDocumentBase(), urlstring);
			fApplet.getAppletContext().showDocument(url);
		} catch (MalformedURLException exception) {
			fApplet.showStatus(exception.toString());
		}
	}
}