/*
 *  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.*;
import java.awt.event.*;
import javax.swing.*;
import java.net.*;
public class CheckboxTest extends JApplet
                          implements ItemListener {

  private JLabel label;
  private JCheckBox[] box = new JCheckBox[5];
  private Font f = new Font("Dialog", Font.PLAIN, 18);
  private ImageIcon icon1,icon2;

  public void init() {
    try{
     
       icon1=new ImageIcon(new URL("http://www.npac.syr.edu/projects/webtech/java/examples1.2/checkboxtest/bulb1.gif"));
       icon2=new ImageIcon(new  URL("http://www.npac.syr.edu/projects/webtech/java/examples1.2/checkboxtest/bulb2.gif"));

    } catch (Exception e){}
    getContentPane().setLayout(new GridLayout(7,1));
    getContentPane().setBackground( Color.white );
    getContentPane().setFont (f);

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

    // Instantiate some checkboxes
    box[0] = new JCheckBox( "Shoes" , icon1);
    box[1] = new JCheckBox( "Socks" , icon1);
    box[2] = new JCheckBox( "Pants" , icon1);
    box[3] = new JCheckBox( "Shirt" , icon1);
    // Check the next box by default:
    boolean checked = true;
    box[4] = new JCheckBox( "Underwear",  icon2, 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);
      getContentPane().add ( box[i] );
      box[i].addItemListener( this );
    }
    
    // Add label to the applet and update it:
    label = new JLabel( " ", JLabel.LEFT );
    getContentPane().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].getModel().isPressed() ) changeIcon(box[i]);
		
		if ( box[i].isSelected() ) {
        if ( str.equals( "" ) )  str += "   Don't forget your ";
        else str += ", ";
        str += box[i].getLabel().toLowerCase();
      }
    }//end for
    // 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

  }
  
  public void changeIcon(JCheckBox c)
  {
    if (c.getIcon()==icon1)
    {
      c.setIcon(icon2);   
    }
    else
    {
      c.setIcon(icon1);   
    }
  }
}//end class