/*
 *  File:  ChoiceTest.java
 *
 *  Choosing items from a drop-down menu.  Shows type Choice and how
 *   to add items.  Shows ItemEvents caused by selecting an item on a menu.
 *
 *  Copyright:  Northeast Parallel Architectures Center
 *  
 */

import java.awt.Color;
import java.awt.Font;
import java.awt.Label;
import java.awt.Choice;
import java.awt.event.ItemListener;
import java.awt.event.ItemEvent;

public class ChoiceTest extends java.applet.Applet 
                        implements ItemListener {

  private Label label1, label2, label3; 
  private Choice directorylist, formatlist;
  private Font f = new Font ("Dialog", Font.PLAIN, 24 );

  public void init() {
    setBackground( Color.white );
    setFont (f);

    label1 = new Label( "Directory:  ", Label.RIGHT );
    
    directorylist = new Choice();
    directorylist.addItem( "HTML"       );
    directorylist.addItem( "JavaScript" );
    directorylist.addItem( "CGI"        );
    directorylist.addItem( "Java"       );
    directorylist.addItem( "JDBC"       );
    directorylist.addItem( "VRML"       );
    // Select "JavaScript" as the default menu choice:
    directorylist.select(1);
    //    directorylist.setBackground( Color.white );

    label2 = new Label( "   Format:  ", Label.RIGHT );
    
    formatlist = new Choice();
    formatlist.addItem( ".zip"    );
    formatlist.addItem( ".tar.Z"  );
    formatlist.addItem( ".tar.gz" );
    formatlist.addItem( ".sit"    );
    // Select ".tar.gz" as the default menu choice:
    formatlist.select(2);
    //    formatlist.setBackground( Color.white );
    
    label3 = new Label();
    label3.setAlignment( Label.CENTER );
    updateLabel();
    
    add( label1 ); add( directorylist );
    add( label2 ); add( formatlist );
    add( label3 );
    
    directorylist.addItemListener( this );
    formatlist.addItemListener( this );
  }
  
  public void itemStateChanged( ItemEvent event ) {
  // if an item is changed on either choice list, update the label
    updateLabel();
  }
  
  public void updateLabel() {
    String s = directorylist.getSelectedItem();
    s += formatlist.getSelectedItem();
    label3.setText( "File:  " + s );
  }

}