/** ListPanel.java -- Create a panel that shows a list of file names
 * for the user to choose.  Here, we use a JList, which accepts an
 *  array or vector of items.  What's unique here is that we are
 *  using a ListSelectionListener interface to listen for the event
 *  of someone choosing something on the list.
 */

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

public class ListPanel extends JPanel
{
  private JLabel label;
  private JList list;

  public ListPanel(JLabel l)
  {
    label = l;
    String [] fileName = { "lagoon.jpg", "tower.jpg", "puppy.jpg",
                           "poor-kitty.jpg", "horse.jpg"  };
    list = new JList(fileName);
    list.addListSelectionListener(new ListListener());
    list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    add(list);
  }

  private class ListListener implements ListSelectionListener
  {
    // Find out which file the user chose, and display the appropriate
    // image in the JLabel object that was passed to the constructor.
    public void valueChanged(ListSelectionEvent e)
    {
      if (list.isSelectionEmpty())
        label.setIcon(null);
      else
      {
        String fileName = (String) list.getSelectedValue();
        ImageIcon image = new ImageIcon(fileName);
        label.setIcon(image);
      }
    }
  }
}