javasweeper/Face.java

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

// The face at the top of the game
public class Face extends JComponent {
	// The width and height
	public static final int SIZE = 26;
	// The indexes of each face in the array
	public static final int HAPPY_INDEX = 0;
	public static final int SHOCKED_INDEX = 1;
	public static final int DEAD_INDEX = 2;
	public static final int COOL_INDEX = 3;
	public static final int PRESSED_INDEX = 4;

	// The main game canvas to refer back to
	private final Canvas GAME_CANVAS;

	private Image[] faces;
	// The current face index
	private int face;
	// The last face index, before being pressed, in order to revert on unpress
	private int unpressedFace;
	// Whether the face is being pressed right now
	private boolean pressed;
	// Whether the mouse is over the face
	private boolean mouseOver;

	public Face(Canvas gameCanvas) {
		GAME_CANVAS = gameCanvas;
		face = HAPPY_INDEX;
		pressed = false;
		mouseOver = false;
		setPreferredSize(new Dimension(SIZE, SIZE));
		// We want to show the pressed sprite only if the mouse is down while
		// the mouse is over the face, reverting back when it's no longer over
		// the face but coming back as soon as the mouse comes back
		addMouseListener(new MouseAdapter() {
			// The only way to initiate a pressed face state is when the mouse
			// is over it and is pressed down
			@Override
			public void mousePressed(MouseEvent e) {
				pressed = true;
				unpressedFace = face;
				setFace(PRESSED_INDEX);
			}

			// If the face recieves a mouseReleased event while the mouse is
			// over it, that means that it was a completed click, so restart the
			// game on the canvas, also resetting back to the happy face that
			// should be shown at the start of every game
			@Override
			public void mouseReleased(MouseEvent e) {
				pressed = false;
				if (mouseOver) {
					setFace(HAPPY_INDEX);
					GAME_CANVAS.restart();
				}
			}

			// If it was previously being pressed, reshow the pressed sprite as
			// soon as mouse enters
			@Override
			public void mouseEntered(MouseEvent e) {
				mouseOver = true;
				if (pressed)
					setFace(PRESSED_INDEX);
			}

			// Temporarily show the unpressed face, but keep the pressed boolean
			// true in case the mouse reenters
			@Override
			public void mouseExited(MouseEvent e) {
				mouseOver = false;
				if (pressed)
					setFace(unpressedFace);
			}
		});
	}

	public void setImages(Image[] faces) {
		this.faces = faces;
	}

	public void setFace(int face) {
		this.face = face;
		repaint();
	}

	@Override
	public void paintComponent(Graphics gr) {
		super.paintComponent(gr);
		Graphics2D g = (Graphics2D) gr;

		g.drawImage(faces[face], 0, 0, this);
	}
}