// Fig. 20.19 : LogoAnimator.java
// Animation bean
package logobml;

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

public class LogoAnimator extends JPanel
       implements ActionListener, Serializable {
   protected ImageIcon images[];
   protected int totalImages = 30,
                 currentImage = 0,
                 animationDelay = 50; // 50 millisecond delay
   protected Timer animationTimer;

   public LogoAnimator()
   {
      setSize( getPreferredSize() );

      images = new ImageIcon[ totalImages ];

      URL url;

      for ( int i = 0; i < images.length; ++i ) {
         url = getClass().getResource(
                  "deitel" + i + ".gif" );
         images[ i ] = new ImageIcon( url );
      }

      startAnimation();
   }

   public void paintComponent( Graphics g )
   {
      super.paintComponent( g );

      if ( images[ currentImage ].getImageLoadStatus() ==
           MediaTracker.COMPLETE ) {
         images[ currentImage ].paintIcon( this, g, 50, 25 );
         currentImage = ( currentImage + 1 ) % totalImages;
      }
   }

   public void actionPerformed( ActionEvent e )
   {
      repaint();
   }

   public void startAnimation()
   {
      if ( animationTimer == null ) {
         currentImage = 0;  
         animationTimer = new Timer( animationDelay, this );
         animationTimer.start();
      }
      else  // continue from last image displayed
         if ( ! animationTimer.isRunning() )
            animationTimer.restart();
   }

   public void stopAnimation()
   {
      animationTimer.stop();
   }

   public Dimension getMinimumSize()
   { 
      return getPreferredSize(); 
   }

   public Dimension getPreferredSize()
   {
      return new Dimension( 200, 140 );
   }

   public static void main( String args[] )
   {
      LogoAnimator anim = new LogoAnimator();

      JFrame app = new JFrame( "Animator test" );
      app.getContentPane().add( anim, BorderLayout.CENTER );

      app.addWindowListener(
         new WindowAdapter() {
            public void windowClosing( WindowEvent e )
            {
               System.exit( 0 );
            }
         }
      );

      app.setSize( anim.getPreferredSize().width + 10,
                   anim.getPreferredSize().height + 20 );
      app.show();
   }
}