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* Copyright (c) 1994-1998 Sun Microsystems, Inc. All Rights Reserved.
*
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* documentation for NON-COMMERCIAL or COMMERCIAL purposes and without fee is
* hereby granted. Please refer to the file
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* important copyright and trademark information and to
* http://java.sun.com/nav/business/index.html for further important licensing
* information for the Java (tm) Technology.
* 
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
* SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
* NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY
* LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR
* ITS DERIVATIVES.
* 
* THIS SOFTWARE IS NOT DESIGNED OR INTENDED FOR USE OR RESALE AS ON-LINE
* CONTROL EQUIPMENT IN HAZARDOUS ENVIRONMENTS REQUIRING FAIL-SAFE PERFORMANCE,
* SUCH AS IN THE OPERATION OF NUCLEAR FACILITIES, AIRCRAFT NAVIGATION OR
* COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL, DIRECT LIFE SUPPORT MACHINES, OR
* WEAPONS SYSTEMS, IN WHICH THE FAILURE OF THE SOFTWARE COULD LEAD DIRECTLY TO
* DEATH, PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
* RISK ACTIVITIES"). SUN SPECIFICALLY DISCLAIMS ANY EXPRESS OR IMPLIED
* WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
*/

/* Modifié le 3.3.1999 par Xavier GARREAU... */


import java.applet.*;
import java.awt.*;
import java.awt.image.*;
import java.net.*;
import java.util.*;

public class ImageList extends Object
{
   private Applet applet;

   private ImageItem[] list;
   private int current = 0;		// image courante

   private URL codeBase;		// Url de l'applet

   private int number = 0;		// Nombre d'images
   private long time = 0;

   private boolean mouseEnter = false;

   public ImageList(Applet applet)	// Constructeur
   {
      this.applet = applet;

      codeBase = applet.getCodeBase();
   }

   public void loadImages()
   {
      // Récupère le paramètre 'number'

      String value = applet.getParameter("number");

      if (value != null)
      {
         number = Integer.parseInt(value);
      }

      else
      {
         number = 0;
      }

      list = new ImageItem[number];

      // Récupère les paramètres 'itemN' et 'lengthN'

	  for (int i = 0; i < number; i++)
      {
         try
         {
            value = applet.getParameter("length" + i);
			long length;
			if (value != null)
			{
				length = Integer.parseInt(value);
			}
			else
			{
				length = 3000;	// Par défaut 3 secondes par image
			}
			String item = applet.getParameter("item" + i);
			String[] field = parseStrings(item, "|");

            Image img = applet.getImage(codeBase, field[0]);	// récupération de l'image

            applet.showStatus("Loading: " + field[0]);

            URL url = new URL(field[1]);
            list[i] = new ImageItem(img, length, field[1], url);	/* Crétion d'un objet contenant l'image 
											et des informations la concernant */
         }

         catch(MalformedURLException e)
         {
            e.printStackTrace();
         }
      }
   }

   public String getURLString()	// Renvoie une représentation de l'url correspondant à l'image affichée
   {
      return list[current].str;
   }

   public URL getURL()		// Renvoie l'url correspondant à l'image affichée
   {
      return list[current].url;
   }

   public void setMouseEnter(boolean value)	// Gestion de la présence de la souris sur l'applet
   {
      mouseEnter = value;
   }

   public void update()		// Rafraîchissement de l'image
   {
      if (time > 0)
      {
         if ((System.currentTimeMillis() - time) >= list[current].length)
         {
            nextImage();
            time = System.currentTimeMillis();

            if (mouseEnter)	// Si la souris est sur l'applet, on affiche l'adrese correspondant à l'image affichée
            {
               applet.showStatus(list[current].str);
            }
         }
      }

      else
      {
         time = System.currentTimeMillis();
      }
   }

   private void nextImage()	// Méthode de changement d'image actuelle
   {
      if ((current + 1) >= number)
      {
         current = 0;
      }

      else
      {
         current++; 
      }
   }

   public void paint(Graphics g)
   {
      g.drawImage(list[current].img, 0, 0, applet);
   }

   public String[] parseStrings(String str, String sep)	// Gestion de chaîne pour la récupération des paramètres
   {
      if (str != null)
      {
         StringTokenizer st = new StringTokenizer(str, sep);
         String result[] = new
         String[st.countTokens()];

         for (int i = 0; i < result.length; i++)
         {
            result[i] = st.nextToken();
         }

         return result;
      }

      else
      {
         return null;
      }
   }
}