// Mainframe class that extends Frame
// Date:  3-9-99

// Give applet access to all the AWT toolkit libraries
import java.awt.*;
import java.awt.event.*;
public class topicfrm extends Frame
                      implements ActionListener, ItemListener, MouseListener{

//  declare variables
private CheckboxGroup radios;
private Checkbox radioItem1;
private Checkbox radioItem2;
public int imageRow = 0;
public int imageCol = 0;
public mainframe parent;

// constructor with user interaction components
public topicfrm (String s, mainframe ref){
    super (s);                           // call base class constructor to set frame title
    parent = ref;
    addMouseListener (this);
    addWindowListener (new closewindow());
    setBackground (Color.black);

    //add radio button panel
    setLayout (new BorderLayout());
    Panel p = new Panel();
    p.setBackground (Color.lightGray);
    p.setLayout (new GridLayout(2,1));

    //define radio buttons
    radios = new CheckboxGroup();
    radioItem1 = new Checkbox ("General History", radios, true);
    radioItem2 = new Checkbox ("Architectural Definitions", radios, false);
    radioItem1.addItemListener(this);
    radioItem2.addItemListener(this);

    //add to panel and place panel
    p.add (radioItem1);
    p.add (radioItem2);
    add ("Center",p);
    }

public void paint (Graphics g)
//paints the correct image in the mainframe
{
    g.setColor (Color.black);
    }

public void mousePressed (MouseEvent e){}
public void mouseClicked (MouseEvent e) {}
public void mouseEntered (MouseEvent e) {}
public void mouseExited (MouseEvent e) {}
public void mouseMoved (MouseEvent e) {}
public void mouseReleased (MouseEvent e) {}
public void actionPerformed (ActionEvent e) {}

public void itemStateChanged (ItemEvent e)
{
    if (e.getSource() == radioItem1){
        imageRow = 0;
        parent.update (imageRow);
        }
    else if (e.getSource() == radioItem2){
        imageRow = 1;
        parent.update (imageRow);
        }
    }

}