Team Palmtops 22/Palmtops_numero22.iso/pc/Interface/Calembour.java

Java Source | 2000-12-07 | 6.6 KB | 314 lines

/*
 * 00:01:00 08/12/00
 *
 * Calembour.java - Advertisment for web pages
 * Copyright (C) 2000 Romain Guy
 * [e-mail]
 * www.jext.org
 *
 */

import java.applet.Applet;

import java.awt.Color;
import java.awt.Cursor;
import java.awt.Image;
import java.awt.Graphics;
import java.awt.MediaTracker;

import java.awt.event.MouseEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseMotionAdapter;

import java.net.URL;
import java.net.MalformedURLException;

import java.util.Vector;

public class Calembour extends Applet implements Runnable
{
  private Graphics off;
  private Image offImg;

  private URL myURL;
  private Color backColor;

  private Thread runner;
  private MediaTracker tracker;

  private int bannerIndex = -1;
  private Banner currentBanner;
  private Vector banners = new Vector();

  private long start = 0;
  private boolean isError;

  /**
   * In the <code>init()</code> method, we simply add a
   * <code>MouseMotionListener</code>, create a
   * <code>MediaTracker</code> and then get the parameters.
   */

  public void init()
  {
    // image for double bffering
    offImg = createImage(size().width, size().height);

    // create a Graphics object from the image
    off = offImg.getGraphics();

    Color backColor = Color.white;
    String data;
    tracker = new MediaTracker(this);

    // ---- Background color ----

    data = getParameter("bgcolor");
    if (data != null)
    {
      try
      {
        backColor = Color.decode(data);
      } catch (NumberFormatException nfe) {
        backColor = Color.white;
      }
    }
    setBackground(backColor);

    data = null;

    for (int i = 0; ; i++)
    {
      data = getParameter("banner" + i);
      if (data == null)
        break;
      else
      {
        Banner _banner = new Banner(data);

        data = getParameter("banner" + i + ".interval");
        int interval;
        if (data == null)
          interval = 7000;

        try
        {
          interval = Integer.parseInt(data);
        } catch (Exception e) {
          interval = 7000;
        }

        _banner.setInterval(interval);

        String link = getParameter("banner" + i + ".link");
        if (link != null)
        {
          String target = getParameter("banner" + i + ".target");
          if (target == null)
            target = "_blank";
          _banner.setLink(link, target);
        }

        data = getParameter("banner" + i + ".image");
        if (data == null)
        {
          _banner.setName("banner" + i + ": missing parameter: image URL");
        } else {
          Image img = getImage(getDocumentBase(), data);
          _banner.setImage(img);
          tracker.addImage(img, i);
        }

        banners.addElement(_banner);
      }
    }

    if (banners.size() == 0)
    {
      getAppletContext().showStatus("Error: no banner specified");
      return;
    } else {
      setCurrentBanner();
    }

    addMouseMotionListener(new MouseMotionAdapter()
    {
      public void mouseMoved(MouseEvent evt)
      {
        getAppletContext().showStatus(currentBanner.getName());
      }
    });

    addMouseListener(new MouseAdapter()
    {
      public void mouseReleased(MouseEvent evt)
      {
        getAppletContext().showDocument(myURL, currentBanner.getTarget());
      }
    });

    off.setColor(getBackground());
    off.fillRect(0, 0, size().width, size().height);
    getGraphics().drawImage(offImg, 0, 0, this);
  }

  private void setCurrentBanner()
  {
    bannerIndex++;
    if (bannerIndex == banners.size())
      bannerIndex = 0;

    currentBanner = (Banner) banners.elementAt(bannerIndex);
    currentBanner.init();

    try
    {
      myURL = new URL(getDocumentBase(), currentBanner.getLink());
    } catch (MalformedURLException mue) { }

    isError = false;
    start = System.currentTimeMillis();
  }

  /**
   * This simply starts the main iOb's Thread.
   */

  public void start()
  {
    if (runner == null)
    {
      runner = new Thread(this);
      runner.start();
    }
  }

  /**
   * Here we kill the Thread.
   */

  public void stop()
  {
    runner.interrupt();
    runner = null;
  }

  /**
   * In this method, we repaint until the picture has been
   * fully loaded.
   */

  public void run()
  {
    Thread me = Thread.currentThread();
    while (runner == me)
    {
      if (tracker.statusID(bannerIndex, false) != MediaTracker.COMPLETE && !isError)
        repaint();
      if (System.currentTimeMillis() - start >= currentBanner.getInterval())
      {
        setCurrentBanner();
        repaint();
      }

      Thread.yield();
    }
  }

  public void update(Graphics g)
  {
    paint(g);
  }

  public void paint(Graphics g)
  {
    if (tracker.isErrorID(bannerIndex))
    {
      off.setColor(Color.black);
      off.drawRect(9, 9, 21, 21);
      off.setColor(Color.red);
      off.setFont(new java.awt.Font("monospaced", java.awt.Font.PLAIN, 12));
      off.drawString("Error loading image", 35, 24);
      off.setFont(new java.awt.Font("monospaced", java.awt.Font.PLAIN, 21));
      off.drawString("X", 13, 27);
      isError = true;
    } else
      currentBanner.paint(off);

    g.drawImage(offImg, 0, 0, this);
  }

  public String getAppletInfo()
  {
    return("Calembour (C)2000 Romain Guy\[e-mail]\nwww.jext.org");
  }

  // the class which holds the banners

  class Banner
  {
    private Image image;
    private int interval;
    private String name, link, target;

    Banner(String name)
    {
      this.name = name;
    }

    public void init()
    {
      setCursor(Cursor.getPredefinedCursor(link == null ?
                                           Cursor.DEFAULT_CURSOR : Cursor.HAND_CURSOR));
    }

    public void setInterval(int interval)
    {
      this.interval = interval;
    }

    public int getInterval()
    {
      return interval;
    }

    public void setLink(String link, String target)
    {
      this.link = link;
      this.target = target;
    }

    public String getLink()
    {
      return link;
    }

    public String getTarget()
    {
      return target;
    }

    public void setImage(Image image)
    {
      this.image = image;
    }

    public void setName(String name)
    {
      this.name = name;
    }

    public String getName()
    {
      return name;
    }

    public void paint(Graphics g)
    {
      g.drawImage(image, 0, 0, Calembour.this);
    }
  }
}

// End of Calembour.java