// Exercise14_10.java: (Rewrite Exercise14_8) Slides show of students
// (Using panel to display images)
import java.awt.*;
import javax.swing.*;
import java.util.*;

public class Exercise14_10 extends JApplet implements Runnable
{
  // Description panel to display photo, name and text
  private NewDescriptionPanel descriptionPanel = new NewDescriptionPanel();

  // Number of the slides specified in the HTML page
  private int numOfShows = 0;

  private Image[] image;
  private String[] text;
  private String[] name;

  // Run slide show on a separate thread
  private Thread thread = null;

  // Control the slides show
  private boolean suspended = false;

  // Initialize the applet
  public void init()
  {
    // Get the numOfShows parameter from the HTML page
    numOfShows = Integer.valueOf(getParameter("numOfShows")).intValue();
    System.out.println("number of shows" + numOfShows);

    // Create arrays for image, text and name
    image = new Image[numOfShows];
    text = new String[numOfShows];
    name = new String[numOfShows];

    // Initialize text, name and image
    for (int i=0; i<numOfShows; i++)
    {
      if (i>9)
      {
        text[i] = getParameter("p1"+(char)('0'+i%10));
	      name[i] = getParameter("n1"+(char)('0'+i%10));
      }
      else
      {
        text[i] = getParameter("p"+(char)('0'+i));
	      name[i] = getParameter("n"+(char)('0'+i));
      }

      image[i] = getImage(getCodeBase(), "photo/photo" + i + ".gif");
    }

    // Set applet layout and add text area and panel
    getContentPane().add(descriptionPanel, BorderLayout.CENTER);

    // Create the thread
    thread = new Thread(this);
    thread.start();
  }

  public void start()
  {
    resume();
  }

  public void stop()
  {
    suspend();
  }

  public void destroy()
  {
    thread = null;
  }

  //run a slide show
  public void run()
  {
    int current = 0;
    while (true)
    {
      show(current%numOfShows);	//show the current slide
      current = current + 1;

      try
      {
        Thread.sleep(2000);
        synchronized (this)
        {
          while (suspended)
            wait();
        }
      }
      catch (InterruptedException ex)
      { }
    }
  }

  private void show(int current)
  {
    // Show text
    descriptionPanel.setTextDescription(text[current]);

    // Show name
    descriptionPanel.setTitle(name[current]);

    // Show image
    descriptionPanel.setImage(image[current]);
  }

  public synchronized void resume()
  {
    if (suspended)
    {
      suspended = false;
      notify();
    }
  }

  public synchronized void suspend()
  {
    suspended = true;
  }
}

// Define a panel for displaying image and text
// Image is displayed to fit in a fixed size in a panel
class NewDescriptionPanel extends JPanel
{
  // Use ImagePanel to display an image
  // instead of using the label to display an iamge icon
  private ImagePanel imagePanel = new ImagePanel();
  // Label for displaying a title
  private JLabel jlblTitle = new JLabel();
  // Text area for displaying text
  private JTextArea jtaTextDescription;

  // Default constructor
  public NewDescriptionPanel()
  {
    // Group image label and title label in a panel
    JPanel panel = new JPanel();
    panel.setLayout(new BorderLayout());
    panel.add(imagePanel, BorderLayout.CENTER);
    panel.add(jlblTitle, BorderLayout.SOUTH);

    // Create a scroll pane to hold text area
    JScrollPane scrollPane = new JScrollPane
      (jtaTextDescription = new JTextArea());

    // Center the title on the label
    jlblTitle.setHorizontalAlignment(JLabel.CENTER);

    // Set the font for the title and text
    jlblTitle.setFont(new Font("SansSerif", Font.BOLD, 16));
    jtaTextDescription.setFont(new Font("Serif", Font.PLAIN, 14));

    // Set lineWrap and wrapStyleWord true for text area
    jtaTextDescription.setLineWrap(true);
    jtaTextDescription.setWrapStyleWord(true);

    // Set preferred size for the image label and scroll pane
    imagePanel.setPreferredSize(new Dimension(200, 200));
    scrollPane.setPreferredSize(new Dimension(200, 100));

    // Set BorderLayout for the whole panel, add panel and scrollpane
    setLayout(new BorderLayout());
    add(scrollPane, BorderLayout.CENTER);
    add(panel, BorderLayout.WEST);
  }

  // Set the title
  public void setTitle(String title)
  {
    jlblTitle.setText(title);
  }

  // Set the image icon
  public void setImage(Image image)
  {
    imagePanel.showImage(image);
  }

  // Set the text description
  public void setTextDescription(String text)
  {
    jtaTextDescription.setText(text);
  }
}