CustomControls.java

/*
 *
 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions 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 Oracle nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


package java2d;


import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JPanel;
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.
 */
@SuppressWarnings("serial")
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() {

            @Override
            public void mouseClicked(MouseEvent e) {
                if (thread == null) { start(); } else { stop(); }
            }
        });
    }

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

    @Override
    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
    @Override
    public void run() {
    }


    /**
     * Notifier that the custom control thread is running.
     */
    class CCNotifierThread extends Thread {

        @Override
        @SuppressWarnings("SleepWhileHoldingLock")
        public void run() {
            while (thread != null) {
                doNotifier = !doNotifier;
                repaint();
                try {
                    Thread.sleep(444);
                } catch (Exception ex) {
                    break;
                }
            }
            doNotifier = false; repaint();
        }
    }
}