package Scribble;

import java.awt.event.*;
import cs101.awt.Line;
import java.awt.Color;

/**
 * This class processes all mouse events for the scribble board.
 * This includes drawing lines on the SmartCanvas, clearing the
 * lines when the clear button is pressed, and changing the color
 * when the item list is changed.
 **/
public class MyMouseListener extends MouseAdapter 
                implements MouseMotionListener, ActionListener, ItemListener
{
        // Objects used to display and store the lines.
        private ScribbleData lines;
        private SmartCanvas drawArea;
        
        // Currently selected color
        private Color color;
        
        // Last place at which a mouse event occured with the button down.
        private int startX;
        private int startY;

        /**
         * Constructor for this listener.
         * @param lines     ScribbleData which stores all lines.
         * @param drawArea  SmartCanvas on which lines are drawn.
         **/
        MyMouseListener(ScribbleData lines, SmartCanvas drawArea) {
                // Store references to the ScribbleData and SmartCanvas
                // used by the rest of the program.
                this.lines = lines;
                this.drawArea = drawArea;
                // Set the initial color to black.
                color = Color.black;
        }

        /**
         * Called when the mouse button is pressed.
         * When the button is pressed, start a new line from that point.
         **/
        public void mousePressed(MouseEvent e) {
                this.startX = e.getX();
                this.startY = e.getY();
                // Draw a dot at that point.
                lines.addLine(new Line(this.startX, this.startY, 
                                                           this.startX, this.startY,
                                                           this.color));
        }
        
        /**
         * Called when the mouse is dragged (i.e. with the button down)
         * Draw a line from the last seen point to the location of
         * this event, and set the last seen point to the new location.
         **/
        public void mouseDragged(MouseEvent e)
        {
                lines.addLine(new Line(this.startX, this.startY, 
                                                           e.getX(), e.getY(),
                                                           this.color));
                this.startX = e.getX();
                this.startY = e.getY();
        }

        /**
         * Called when the mouse is moved (i.e. without the button down)
         * Does nothing.
         **/
        public void mouseMoved(MouseEvent e)
        {
        }
        
        /**
         * Called when the clear button is pressed.
         * Clears all lines from the ScribbleData
         **/
        public void actionPerformed(ActionEvent e)
        {
                lines.clearLines();
        }
        
        /**
         * Called when the color selection is changed.
         * Set the current drawing color to the new specified
         * color.
         **/
        public void itemStateChanged(ItemEvent e)
        {
                this.color = cs101.util.Coerce.StringToColor((String)e.getItem());
        }

}