// Assignment #: 7
//         Name: Your name
//    StudentID: Your id
//      Lecture: Your lecture
//  Description: it needs to be filled.

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;  // to use listener interfaces
import javax.swing.event.*;
import java.util.ArrayList;

public class WholePanel extends JPanel
 {
	private ArrayList charList;
	private Color currentColor;
	private char currentChar;

	private char finalChar;

	private int currentSize;
	private CanvasPanel canvas;
	private JPanel menuPanel;
	private JButton undo;

	private Point point;
	private ArrayList<Letter> letterList;
	private Letter letter;

 	public WholePanel()
     {
    	letterList = new ArrayList<Letter>();

    	//black is the default color
    	currentColor = Color.black;
    	//20 is the default font size
    	currentSize = 20;

    	// set the default character to 'a'
    	currentChar = 'a';

    	charList = new ArrayList();

    	//create "undo" button
    	undo = new JButton ("Undo");

    	menuPanel = new JPanel();
    	menuPanel.add(undo);

    	canvas = new CanvasPanel();

    	JSplitPane sPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, menuPanel, canvas);

    	setLayout(new BorderLayout());
     	add(sPane, BorderLayout.CENTER);


     	//to be completed

     }


 //insert ButtonListener, ColorListener, and SizeListener classes


	//CanvasPanel is the panel where pressed keys will be drawn
	private class CanvasPanel extends JPanel
 	 {
		//Constructor to initialize the canvas panel
		public CanvasPanel( )
     	 {
    		// make this canvas panel listen to keys
       		addKeyListener (new LetterListener());
        	// make this canvas panel listen to mouse
        	addMouseListener(new PointListener());

        	setBackground(Color.white);

        	//This method needs to be called for this panel to listen to keys
        	//When panel listens to other things, and go back to listen
        	//to keys, this method needs to be called again.
        	requestFocus();

     	 }


		//this method draws all characters pressed by a user so far
		public void paintComponent(Graphics page)
    	 {
    		super.paintComponent(page);

    		//set color, font, then draw a string containing a character
    		page.setColor(currentColor);
    		page.setFont(new Font("TimesRoman", Font.PLAIN, currentSize));

    		//draws the string
    		String tmp2 = "";
    		String tmp = "";
    		tmp = Character.toString(currentChar);
    		tmp2 = tmp2 + tmp;
    		char finalChar = String.charAt(String.length());

			letter = new Letter(point.x, point.y, finalChar, currentColor, currentSize);
			letterList.add(letter);
	   		for (int i=0; i<letterList.size(); i++)
			 {
				letterList.get(i).draw(page);
	    	 }
	 	 }

		/** This method is overriden to enable keyboard focus */
    	public boolean isFocusable()
    	 {
    		return true;
    	 }

    	// listener class to listen to keyboard keys
    	private class LetterListener implements KeyListener
    	 {
    		public void keyReleased(KeyEvent e) {}

    		public void keyTyped(KeyEvent e) {}

    	    // in case that a key is pressed, the following will be executed.
    	  	public void keyPressed(KeyEvent e)
    	     {
    	    	//get a letter (character key) pressed by a user
    	        currentChar = e.getKeyChar();
    	        //call paintComponent method indirectly
    	        canvas.repaint();
    	     }
    	 } // end of LetterListener


		//Mouse Listener class
    	public class PointListener implements MouseListener
    	 {
			//in case that a user presses using a mouse,
    	    //record the point where it was pressed.
    	    public void mousePressed (MouseEvent event)
    	     {
    	    	canvas.requestFocus();
    	        point = event.getPoint();
    	        repaint();
    	     }

    	    public void mouseClicked (MouseEvent event) {}
    	    public void mouseReleased (MouseEvent event) {}
    	    public void mouseEntered (MouseEvent event) {}
    	    public void mouseExited (MouseEvent event) {}
    	    public void mouseMoved(MouseEvent event) {}
    	    public void mouseDragged(MouseEvent event) {}

    	 }

	 } // end of Canvas Panel Class

 } // end of Whole Panel Class