/*  simulates a text editor, you can click the mouse anywhere and start typing
 *  from there -- even over old characters */

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

public class Typewriter
{
	public static void main(String[] args)
	{
		JFrame frame = new JFrame();
		frame.setTitle("Typewriter Demo");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		TypePanel panel = new TypePanel();
		panel.setFocusable(true);			// needed for KeyListener to work
		frame.add(panel);
		frame.setSize(310, 310);
		frame.setVisible(true);
	}


	// the TypePanel will extend JPanel so we can use the Graphics class and will
	// implement MouseListener to move the cursor when the mouse is clicked and
	// KeyListener so that the user can type

	private static class TypePanel extends JPanel implements MouseListener, KeyListener
	{
		private int x, y;			// the <x, y> cooridnate of the cursor
		private char key;			// the most recent key entered

		public TypePanel()
		{
			addMouseListener(this);	// add the listeners
			addKeyListener(this);

			x = 10;					// initialize the cursor position
			y = 20;
			key = ' ';				// initialize the key to be printed
		}

		public void mouseClicked(MouseEvent e)	// upon mouse click, move cursor
		{
			int tempX = e.getX();
			int tempY = e.getY();				// make sure cursor is within margins
			if(tempX > 10 && tempX < 280 && tempY > 10 && tempY < 280)
			{
				x = tempX;
				y = tempY;
			}
		}

		public void keyTyped(KeyEvent e)		// on key press, place the key in the panel at the cursor
		{										// position and then move the cursor 7 to the right, but first
			key = e.getKeyChar();				// first save the cursor's old position to erase the cursor (triangle)
			repaint();

		}

		public void paintComponent(Graphics g)
		{
			String temp = "" + key;			// convert key into String for drawString
			g.setColor(Color.black);		// draw the key as a String
			g.drawString(temp, x, y-1);
			x+=7;
			if(x>280) {
				x=10;
				y+=12;
				if(y>280) y=10;
			}
		}

		public void mouseEntered(MouseEvent e) {}	// the remainder of the methods
		public void mouseExited(MouseEvent e) {}	// needed to implement MouseListener
		public void mousePressed(MouseEvent e) {}
		public void mouseReleased(MouseEvent e) {}

		public void keyPressed(KeyEvent e) {}		// and KeyListener
		public void keyReleased(KeyEvent e) {}
	}
}