// CSE 331, Spring 2011
// This program displays a simple Graphical User Interface (GUI) to demonstrate
// the Java Swing library.
// It just pops up several buttons and lets us change their color when we
// click on them.

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

public class BabysFirstGUI {
	private JButton button;
	private JButton button2;
	private JFrame frame;
	
	// Constructs the GUI and displays it on the screen.
	public BabysFirstGUI() {
		// create some components (buttons)
		button = new JButton("Click here to get a 4.0");
		button.setBackground(Color.RED);
		button.setFont(new Font("Comic Sans MS", Font.BOLD, 18));
		
		button2 = new JButton("Click here to get a 0.0");
		button2.setBackground(Color.YELLOW);
		
		// attach event listener to handle mouse clicks
		MyAwesomeListener listener = new MyAwesomeListener();
		button.addActionListener(listener);
		button2.addActionListener(listener);
		
		// create overall window (frame) and put buttons in it
		frame = new JFrame("331 is great");
		frame.setLocation(300, 100);
		frame.setSize(400, 300);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		// layout manager decides how to position/size the components in the frame
		frame.setLayout(new BorderLayout());
		frame.add(button, BorderLayout.NORTH);
		frame.add(button2, BorderLayout.SOUTH);
		frame.add(new Button("W"), BorderLayout.WEST);
		frame.add(new Button("I am in the EAST"), BorderLayout.EAST);
		
		frame.setVisible(true);
	}
	
	// This class handles "action events", aka mouse clicks, in buttons.
	public class MyAwesomeListener implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			if (e.getSource() == button) {
				button2.setBackground(Color.BLUE);
			} else {
				// event source is button2
				button.setBackground(Color.BLUE);
			}
		}
	}
}