/*
 *  File:  CheckboxGroupTest.java
 *
 *  Create some radio buttons, using Checkboxes with CheckboxGroup
 *       and ItemEvents
 *
 *  Copyright:  Northeast Parallel Architectures Center
 *  
 */

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

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

  private Label label;
  private int n = 6;  // number of radio buttons
  private Checkbox[] radioButton = new Checkbox[n];
  private CheckboxGroup radioButtons = new CheckboxGroup();
  private Font f = new Font("Dialog", Font.PLAIN, 18);
  private Color purple = new Color (127, 0, 255);
  private String[] colorLabel = new String[n];
  private Color[] colorlist = new Color[n];
  
  public void init() {
    setBackground( Color.white );
    setFont (f);

    colorLabel[0] = "Red";    colorLabel[1] = "Blue";
    colorLabel[2] = "Yellow"; colorLabel[3] = "Green";
    colorLabel[4] = "Magenta"; colorLabel[5] = "Purple";

    colorlist[0] = Color.red;    colorlist[1] = Color.blue;
    colorlist[2] = Color.yellow; colorlist[3] = Color.green;
    colorlist[4] = Color.magenta; colorlist[5] = purple;
    
    // Instantiate radio buttons and add them to the applet:
    for ( int i = 0; i < n; i++ ) {
      radioButton[i] = new Checkbox( colorLabel[i], radioButtons, false );
      add( radioButton[i] );
      // Register applet as an event listener with the radio button:
      radioButton[i].addItemListener( this );
    }
    radioButtons.setSelectedCheckbox( radioButton[0] );
    
    // Add label to the applet:
    label = new Label( "                                      ", Label.LEFT );
    add( label );
  }

  public void itemStateChanged( ItemEvent event ) {
    updateLabel();
  }
  
  public void updateLabel() {
    String str = "   You chose color ";
    String cblabel = radioButtons.getSelectedCheckbox().getLabel() ;
    str += cblabel + "!";
    for ( int i=0; i < n; i++)
      { 
        if (cblabel.equals (colorLabel[i]))
	    { label.setForeground ( colorlist[i]); break; }
      }
    label.setText(str);
  }
  
}