/* ColorAppDemo.java
	@author version 1.0	03/06/96	Hirschfield & Decker
	@author version 1.2	01/18/99	by Robert Philbin
	@author version 2.1	04/13/10	R.Philbin - convert to Swing application
*/

/* This comment outlines your assignment for this lablet.  After each number
	below, starting with #2, recompile and run

  1 	What are the class file names?  To which classes do they correspond?
  	Answer by adding a comment after each class specifying the name of the
  	resulting file.  I;ve done this for class  ColorAppDemo

  2	Experiment with changing the 18 in
		f = new Font("Serif", Font.BOLD, 18);
	to some other number.  Also, find and document the location of
	the on-line documentation for this method.  To change the font,
	use one of Serif, Sans-serif, Monospaced, Dialog, or DialogInput.

  3	Try commenting out one of the repaint(); calls.  What happens and why?

  4	What is the purpose of each of the 6 variables? Answer this by
	writing a short	comment after each as I've done for the variable f.

  5	Change the numeral 3 to a 2 in the line
		colorOfText = ++colorOfText % 3;
	What is the effect? Why? Put your answer immediately after the line
	(~line91) as a comment.

  6	How did we know to name the methods actionPerformed and paint
	and how did we know what their "signatures" should be (i.e., the
	"arguments" or "parameters" in the parentheses) ?
	Answer this by adding comments just before each of the three methods
	in question which specify where in the documentation you found the
	method and its signature.

  7	Add two, different, colors to the text color scheme.

  8	Change the output text to something of your own choosing.  For a challenge,
  	try making it print out the name of the Color, either fore- or back-ground.
*/

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Dimension;
import javax.swing.JButton;
import javax.swing.JPanel;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;


public class ColorAppDemo extends JPanel // Q1: generates ColorAppDemo.class
{
	Font		f;						// output Font
	int 		colorOfBackground = 0;	// Q4: ???
	int 		colorOfText = 0;		// Q4: ???
	JButton		backButton;				// Q4: ???
	JButton		textButton;				// Q4: ???
	Dimension	myAppDim;				// Q4: ???

	public ColorAppDemo()
	{
		f = new Font("Helvetica", Font.BOLD, 18); 	// Q2: ???

		backButton = new JButton ("Background Color");
		add(backButton);
		backButton.addActionListener( new BackGndButtonListener() );

		textButton = new JButton("Text Color");
		add(textButton);
		textButton.addActionListener( new TextButtonListener() );
	}

	// BackGndButtonListener is an 'inner' class that can 'see' instance variables
	class BackGndButtonListener implements ActionListener
	{
		public void actionPerformed(ActionEvent e)
		{
			colorOfBackground = ++colorOfBackground % 4;
			repaint();				// Q3: ???
		}
	}

	// TextButtonListener is an 'inner' class that can 'see' instance variables
	class TextButtonListener implements ActionListener
	{
		public void actionPerformed(ActionEvent e)
		{
			colorOfText = ++colorOfText % 3;	// A5: ?????????????
			repaint();				// Q3: ???
		}
	}


	// This method is called whenever the window is redrawn
	// Who calls it?
	public void paint(Graphics g)
	{
		super.paint(g);
		switch (colorOfBackground)
		{
			case 0: setBackground(Color.cyan); break;
			case 1: setBackground(Color.orange); break;
			case 2: setBackground(Color.red); break;
			case 3: setBackground(Color.black); break;
			default: setBackground(Color.cyan); break;
		}

		switch (colorOfText)
		{
			case 0: setForeground(Color.blue); break;
			case 1: setForeground(Color.magenta); break;
			case 2: setForeground(Color.green); break;
			default: setForeground(Color.blue); break;
		}

		g.setFont(f);
		myAppDim = getSize();
		g.drawString("Goodbye World! Hello Java!!",
					(myAppDim.width/2) - 120,
					(myAppDim.height/2) + 20);

	}


	/** for testing purposes only, generally in a Test... class */
	public static void main(String args[])
	{
		ColorAppDemo cad = new ColorAppDemo();

		javax.swing.JFrame app = new javax.swing.JFrame("Test ColorAppDemo");

		app.add( cad );
		app.setDefaultCloseOperation( javax.swing.JFrame.EXIT_ON_CLOSE );
		app.setSize( 400, 300 );
		app.setVisible( true );
	}
}