/* 
 * Copyright (c) 1999-2002, Xiaoping Jia.  
 * All Rights Reserved. 
 * 
 * Modified to be an application rather than an applet.
 * Barbara Lerner  Sept. 4, 2006
 */

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

/**
 * A simple Java application. It displays a text message and an image of the planet Venus.
 * There are two buttons that allow the user to select one of two messages to display.
 * 
 * This class "implements ActionListener" so that it can handle the button clicks.
 */
public class HelloFromVenus implements ActionListener {
	// The panel containing the image and the text
	private VenusPanel venusPanel;
	
	// The button used to display the hi message.
	private JButton hiButton;
	
	// The button used to display the bye message.
	private JButton byeButton;
	
	// Creates the user interface
	public HelloFromVenus() {
		// Create the window and set its size.
		JFrame f = new JFrame();
		f.setSize(new Dimension(300, 350));
		
		// Create the panel that will display the image and text
		venusPanel = new VenusPanel();
		
		// Add the venus panel to the center of the window
		Container contentPane = f.getContentPane();
		contentPane.add(venusPanel, BorderLayout.CENTER);
		
		// Create a panel to hold the buttons
		JPanel buttonPanel = new JPanel();
		
		// Indicate that the buttons will be in a row.
		buttonPanel.setLayout (new BoxLayout (buttonPanel, BoxLayout.X_AXIS));
		
		// Create the hi button
		hiButton = new JButton ("Hi");
		
		// Indicate that this object will manage the clicks on the hi button.
		hiButton.addActionListener(this);
		
		// Add the button to the button panel.
		buttonPanel.add(hiButton);
		
		// Repeat the previous 3 steps to create the bye button.
		byeButton = new JButton ("Bye");
		byeButton.addActionListener (this);
		buttonPanel.add(byeButton);
		
		// Add the buttons as a group to the bottom of the window.
		contentPane.add(buttonPanel, BorderLayout.SOUTH);
		
		// Display the window.
		f.setVisible(true);
	}
	
	/** 
	 * @param e information about the button that was clicked.
	 */
	public void actionPerformed(ActionEvent e) {
		// If the hi button was clicked, tell the venus panel to display the hi message.
		if (e.getSource() == hiButton) {
			venusPanel.sayHi();
		}
		else {
			// Otherwise tell the venus panel to display the bye message.
			venusPanel.sayBye();
		}
	}

	// Start the program simply by creating the user interface.  It will just wait for user
	// interaction or for the user to quit the program.
	public static void main(String[] args) {
		new HelloFromVenus();
	}

}