import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class GUIListener extends WindowAdapter implements ActionListener {

    protected JTextField inputField;

    protected Process process;


    // Postcondition: This GUI listener has been initialized.
    public GUIListener(){}


    // Postcondition: This GUI listener has been initialized according to
    //                the values of tf and p.
    public GUIListener (JTextField tf, Process p) {

        inputField = tf;
        process = p;
    } // constructor


    // Postcondition: The window has closed.
    public void windowClosing (WindowEvent e) {

        System.exit( 0 );

    } // method windowClosing


    // Postcondition: The input has been processed.
    public void actionPerformed (ActionEvent e) {

        inputField.setText( "" );
        inputField.setEnabled (false);
        process.processInput (e.getActionCommand());
        inputField.setEnabled (true);

    } // method actionPerformed


} // class GUIListener