customcontrols.java

一个小公司要求给写的很简单的任务管理系统。

/*
 * @(#)CustomControls.java	1.11 06/08/09
 * 
 * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * -Redistribution of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 * 
 * -Redistribution in binary form must reproduce the above copyright notice, 
 *  this list of conditions and the following disclaimer in the documentation
 *  and/or other materials provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of contributors may 
 * be used to endorse or promote products derived from this software without 
 * specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL 
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST 
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, 
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY 
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, 
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that this software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of any
 * nuclear facility.
 */

/*
 * @(#)CustomControls.java	1.11 06/08/09
 */

package java2d;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.EtchedBorder;

/**
 * A convenience class for demos that use Custom Controls.  This class
 * sets up the thread for running the custom control.  A notifier thread
 * is started as well, a flashing 2x2 rect is drawn in the upper right corner
 * while the custom control thread continues to run.
 */
public abstract class CustomControls extends JPanel implements Runnable {


    protected Thread thread;
    protected boolean doNotifier;
    private CCNotifierThread ccnt; 
    private String name = "foo.bar Demo";
    private static final Color blue = new Color(204, 204, 255);


    public CustomControls() { 
        setBorder(new EtchedBorder());
        addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent e) {
                if (thread == null) { start(); } else { stop(); }
            }
        });
    }

    public CustomControls(String name) {
        this();
        this.name = name + " Demo";
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.setColor(doNotifier ? blue : Color.gray);
        g.fillRect(getSize().width-2, 0, 2, 2);
    }

    public void start() {
        if (thread == null) {
            thread = new Thread(this);
            thread.setPriority(Thread.MIN_PRIORITY);
            thread.setName(name + " ccthread");
            thread.start();
            (ccnt = new CCNotifierThread()).start();
            ccnt.setName(name + " ccthread notifier");
        }
    }

    public synchronized void stop() {
        if (thread != null) {
            thread.interrupt();
            if (ccnt != null) {
                ccnt.interrupt();
            }
        }
        thread = null;
    }


    // Custom Controls override the run method
    public void run() { }


    /**
     * Notifier that the custom control thread is running.
     */
    class CCNotifierThread extends Thread {
        public void run() {
            while (thread != null) {
                doNotifier = !doNotifier;
                repaint();
                try { Thread.sleep(444); } catch (Exception ex) { break; }
            }
            doNotifier = false; repaint();
        }
    }
}