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Keyboard Flasher Java code example - Click here to copy ->>>

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Code:

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

public class KeyboardFlasher implements AWTEventListener {

    public static void main(String[] args) {
        Toolkit tk = Toolkit.getDefaultToolkit();
        KeyboardFlasher flasher = new KeyboardFlasher();
        tk.addAWTEventListener(flasher, AWTEvent.KEY_EVENT_MASK);

        JFrame frame = new JFrame("Hack #63: Keyboard Flasher");
        JTextField tf = new JTextField("this is some text");
        frame.getContentPane().add(tf);
        frame.pack();
        frame.setVisible(true);
    }


    public void eventDispatched(AWTEvent evt) {
        if(evt instanceof KeyEvent) {
            KeyEvent kevt = (KeyEvent)evt;
            if(kevt.getID() == KeyEvent.KEY_PRESSED) {
                System.out.println("key event: " + evt);
                if(kevt.getKeyCode() != KeyEvent.VK_SCROLL_LOCK) {
                    flipScrollLock();
                }
            }
        }
    }

    public void flipScrollLock() {
        Toolkit tk = Toolkit.getDefaultToolkit();
        boolean state = tk.getLockingKeyState(KeyEvent.VK_SCROLL_LOCK);
        tk.setLockingKeyState(KeyEvent.VK_SCROLL_LOCK,!state);
    }


}

/*   Swing Hacks
 *   Tips and Tools for Killer GUIs
 * By Joshua Marinacci, Chris Adamson
 *   First Edition June 2005
 *   Series: Hacks
 *   ISBN: 0-596-00907-0
 *   http://www.oreilly.com/catalog/swinghks/
 */

 
 



References.

The list of classes which were used on this page you can find below. The links to Java API contain official SUN documentation about all used classes.

  java.awt.event.AWTEventListener

  java.awt.Toolkit

  javax.swing.JFrame

  javax.swing.JTextField

  java.awt.AWTEvent

  java.awt.event.KeyEvent




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