/**
 * DragAMac.java
 * 
 * Allows one to drag a drawing of a Mac around the screen.
 * Demonstrates events and listeners.
 * This version uses an inner class as the listener.
 *
 * @author Scot Drysdale on 4/12/00. Converted to JApplet 1/15/2012.
 * @author THC modified to use just one listener class that implements two interfaces.
 */
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class DragAMac extends JApplet {
	private static final long serialVersionUID = 1L;
	private final int APPLET_WIDTH = 500;
	private final int APPLET_HEIGHT = 500;

	// Instance variable for the point where the mouse is now.
	private Point dragPoint = null;

	public void init() {
		LocalMouseListener listener = new LocalMouseListener();
		addMouseListener(listener);
		addMouseMotionListener(listener);

		setSize(APPLET_WIDTH, APPLET_HEIGHT);

		Container cp = getContentPane();  // Content pane holds components
		cp.add(new Canvas());     // The canvas is the only component

		setVisible(true);   // Makes the applet (and its components) visible
	}

	/**
	 * Defines the canvas that the drawing is done on.
	 */
	private class Canvas extends JPanel {
		private static final long serialVersionUID = 1L;

		/**
		 * Paints what goes on the canvas - an old-style Mac
		 * @param page the graphic object of the panel for drawing on
		 */
		public void paintComponent(Graphics page) {
			super.paintComponent(page);
			if (dragPoint != null)
				drawAMac(dragPoint, page);
		}
	}

	/**
	 * Define an "inner class" within DragAMac to listen for mouse pressed
	 * and mouse dragged events and to handle them. 
	 */
	private class LocalMouseListener implements MouseListener, MouseMotionListener {
		/**
		 *  Sets instance variable dragPoint to wherever the mouse located.
		 *  Then redraws the component with that as the upper left corner of the Mac.
		 *  Note that because this is in an inner class, it can see dragPoint
		 *  @param event the event that caused this callback.
		 */
		public void mousePressed(MouseEvent event) {
			dragPoint = event.getPoint();
			repaint(); // will redraw it at the new dragPoint.
		}

		/**
		 * When we drag the mouse, we should just do the same things as when
		 * it's pressed.
		 *  @param event the event that caused this callback.
		 */
		public void mouseDragged(MouseEvent event) {
			mousePressed(event);
		}

		//  Provide empty definitions for unused event methods.
		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) {}
	}

	/**
	 * Draws a Mac on the page with p as the upper left corner.
	 * This method is declared private because it is called only by paintComponent.
	 * 
	 * @param p point that is the upper left corner of Mac drawn
	 * @param page the graphics object to draw on
	 */
	private void drawAMac(Point p, Graphics page) {
		page.setColor(Color.blue);
		page.drawRoundRect(p.x, p.y, 160, 210, 10, 10); // draw the Mac outline

		page.drawLine(p.x, p.y + 175, p.x + 160, p.y + 175);

		// Draw floppy drive
		page.setColor(Color.red);
		page.drawLine(p.x + 70, p.y + 147, p.x + 70, p.y + 143);
		page.drawLine(p.x + 70, p.y + 143, p.x + 120, p.y + 143);
		page.drawLine(p.x + 120, p.y + 143, p.x + 120, p.y + 138);
		page.drawLine(p.x + 120, p.y + 138, p.x + 145, p.y + 138);
		page.drawLine(p.x + 145, p.y + 138, p.x + 145, p.y + 152);
		page.drawLine(p.x + 145, p.y + 152, p.x + 120, p.y + 152);
		page.drawLine(p.x + 120, p.y + 152, p.x + 120, p.y + 148);
		page.drawLine(p.x + 120, p.y + 148, p.x + 70, p.y + 148);

		page.drawRect(p.x + 15, p.y + 145, 20, 20); // Apple Logo box

		page.setColor(Color.green);
		page.drawRoundRect(p.x + 20, p.y + 15, 120, 100, 20, 20); // screen outline

		page.setColor(Color.gray);
		page.fillRoundRect(p.x + 30, p.y + 25, 100, 80, 20, 20);
	}
}