/*
 *  File:  CheckboxTest.java
 *
 *  Demonstrate the use of Checkboxes and ItemEvents
 *  Also the use of String methods toLowerCase, lastIndexOf and substring
 *
 *  Copyright:  Northeast Parallel Architectures Center
 *  
 */

import java.awt.Color;
import java.awt.Font;
import java.awt.Label;
import java.awt.Checkbox;
import java.awt.Panel;
import java.awt.event.ItemListener;
import java.awt.event.ItemEvent;

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

  private Label label;
  private Checkbox[] box = new Checkbox[5];
  private Font f = new Font("Dialog", Font.PLAIN, 18);

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

    Color lightBlue = new Color( 0xB0, 0xE0, 0xE6 );
    Color  navyBlue = new Color( 0x19, 0x19, 0x70 );

    // Instantiate some checkboxes
    box[0] = new Checkbox( "Shoes" );
    box[1] = new Checkbox( "Socks" );
    box[2] = new Checkbox( "Pants" );
    box[3] = new Checkbox( "Shirt" );
    // Check the next box by default:
    boolean checked = true;
    box[4] = new Checkbox( "Underwear", checked );
    
    // set properties of the checkboxes and add to the applet
    for ( int i = 0; i < box.length; i++ ) {
      box[i].setForeground(  navyBlue );
      box[i].setBackground( lightBlue );
      box[i].setFont (f);
      add ( box[i] );
      box[i].addItemListener( this );
    }
    
    // Add label to the applet and update it:
    label = new Label( " ", Label.LEFT );
    add( label ); updateLabel();
  }

  public void itemStateChanged( ItemEvent event ) {
  // whenever any checkbox is checked, we look at all the checkboxes
  //    and update the label
    updateLabel();
  }
    
  public void updateLabel() {
    // Build string of comma-separated items:
    String str = "";
    for ( int i = 0; i < 5; i++ ) {
      if ( box[i].getState() ) {
        if ( str.equals( "" ) )  str += "   Don't forget your ";
        else str += ", ";
        str += box[i].getLabel().toLowerCase();
      }
    }
    // Insert "and" in the appropriate place:
    if ( !str.equals( "" ) ) {
      str += "!";
      int pos = str.lastIndexOf( "," );
      if ( pos != -1 )
        str = str.substring( 0, pos ) + " and" + str.substring( pos + 1 );
    }
    // for the first time, make sure the string is long enough for FlowLayout
    //    to give it a nice long size
    str += "                                 ";
    label.setText( str );  // update label
  }
  
}