/*
 * File: GreeterGui.java
 * Author: Java Java Java
 * Description: This class provides a graphical user interface for
 *  a greeter application.  The computational object is a Greeter,
 *  which contains a method that simply returns a greeting whenever
 *  it is called.
 */
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class GreeterGUI extends JFrame implements ActionListener 
{   private JTextArea display;
    private JTextField inField;
    private JButton goButton;
    private Greeter greeter;         // Computation object
	    
    public GreeterGUI(String title) 
    {   greeter = new Greeter();  
        buildGUI();
        setTitle(title);
        pack();
        setVisible(true);
    } // GreeterGUI()

    private void buildGUI() 
    {   Container contentPane = getContentPane();
        contentPane.setLayout(new BorderLayout());
        display = new JTextArea(10,30);
        inField = new JTextField(10);
        goButton = new JButton("Click here for a greeting!");
        goButton.addActionListener(this);
        JPanel inputPanel = new JPanel();
        inputPanel.add(new JLabel("Input your name here: "));
        inputPanel.add(inField);
        inputPanel.add(goButton);
        contentPane.add("Center", display);
        contentPane.add("South", inputPanel);
    } // buildGUI()

    public void actionPerformed(ActionEvent e) 
    {   if (e.getSource() == goButton) 
        {   String name = inField.getText();
    	    display.append(greeter.greet(name) + "\n");  // Display a greeting
        }
    } // actionPerformed()
} // GreeterGUI