Source/JDirectMouse.java

import java.awt.Point;
 
/**
 * Apple Worldwide Developer Technical Support
 *
 * A simple example of how to obtain the mouse location using the Mac OS Toolbox through JDirect 2.
 *
 * File: JDirectMouse.java
 *
 *
 * @author Levi Brown
 * @author Apple Computer, Inc.
 *
 * Copyright ©1999 Apple Computer, Inc.
 * All rights reserved.
 *
 * @version 1.0
 * 4/15/1999 Shipped as 'JDirectMouse' sample.
 *
 * You may incorporate this sample code into your applications without
 * restriction, though the sample code has been provided "AS IS" and the
 * responsibility for its operation is 100% yours.  However, what you are
 * not permitted to do is to redistribute the source as "Apple Sample
 * Code" after having made changes. If you're going to re-distribute the
 * source, we require that you make it clear in the source that the code
 * was descended from Apple Sample Code, but that you've made changes.
 */
public class JDirectMouse
{
    protected boolean isRun;
    protected Thread thread;
    
    /**
     * The entry point for this program
     */
    static public void main(String args[])
    {
        (new JDirectMouse()).start();
    }
 
    /**
     * Constructs a new JDirectMouse object and initializes defaults.
     */
    public JDirectMouse()
    {
        isRun = false;
        thread = null;
    }
 
    /**
     * Obtains the mouse location by calling the Mac OS toolbox call GetMouse.
     * @return the location of the mouse in coordinates local to the current native grafPort.
     */
    public Point getMouseLocation()
    {
        //Create a new Point structure to be populated by the native call.
        PointStruct mouseLoc = new PointStruct();
        //Call the toolbox for the mouse location
        EventFunctions.GetMouse(mouseLoc);
        //Convert the native stucture to a java.awt.Point object, and return it.
        return new Point (mouseLoc.getH(), mouseLoc.getV());
    }
    
    /**
     * Starts the thread to poll the mouse location and print it out to the console.
     * @see #stop
     */
    public void start()
    {
        if (thread == null || !thread.isAlive())
        {
            thread = new Thread(new Task());
            isRun = true;
            thread.start();
        }
    }
    
    /**
     * Stops the thread from polling the mouse location and printing it out to the console.
     * @see #start
     */
    public void stop()
    {
        isRun = false;
    }
 
    /**
     * An inner class containing the body of the thread to poll the mouse.
     */
    public class Task implements Runnable
    {
        public void run()
        {
            Point oldLoc = new Point();
            Point newLoc;
            
            while (isRun)
            {
                try
                {
                    newLoc = getMouseLocation();
                    if ( !oldLoc.equals(newLoc))
                    {
                        oldLoc = newLoc;
                        System.out.println(newLoc.toString());
                    }
                    
                    //Increase time if race conditions occur.
                    Thread.sleep(0);
                }
                catch (InterruptedException exc) { }
            }
        }
    }
}


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