package nl.nedcar.transform;

import javax.swing.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.*;
import java.util.Random;

/**
* @author Bart Cremers
* @since Feb 23, 2006
*/
public class JumpingWindow extends JWindow {
   private static final Random RND = new Random();

   private static final Rectangle screenRect;

   static {
       Dimension screenSize =
Toolkit.getDefaultToolkit().getScreenSize();
       GraphicsConfiguration graphConf =
GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice()
           .getDefaultConfiguration();
       Insets insets =
Toolkit.getDefaultToolkit().getScreenInsets(graphConf);
       screenRect = new Rectangle(insets.left, insets.top,
screenSize.width - insets.right - insets.left,
                                  screenSize.height - insets.bottom -
insets.top);
   }

   protected void windowInit() {
       super.windowInit();

       final JButton button = new JButton("Click me to exit!");
       add(button);

       button.addMouseListener(new MouseAdapter() {
           public void mouseEntered(MouseEvent e) {
               super.mouseEntered(e);
               Point currentP = button.getLocationOnScreen();
               int x;
               int y;
               do {
                   x = RND.nextInt(screenRect.width -
button.getWidth()) + screenRect.x;
                   y = RND.nextInt(screenRect.height -
button.getHeight()) + screenRect.y;
               } while (x > currentP.x && x < currentP.x + getWidth()
&& y > currentP.y
                        && y < currentP.y + getHeight());

               setLocation(x, y);
           }
       });

       button.addActionListener(new ActionListener() {
           public void actionPerformed(ActionEvent e) {
               System.exit(0);
           }
       });
   }

   public static void main(String[] args) {
       JWindow w = new JumpingWindow();
       w.pack();
       w.setLocationRelativeTo(null);
       w.setVisible(true);
   }
}