用来遮字幕的程序

看日剧的时候，不想看到中文字幕。所以写了这个程序来遮住字幕。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;

import javax.swing.JFrame;

public class BlackFrame extends JFrame implements MouseListener,
		MouseMotionListener {
	private static final long serialVersionUID = 892335173996481654L;
	private int x1;
	private int y1;
	private int x2;
	private int y2;
	private int direction;
	private static final int NONE = -1;
	private static final int TOP = 0;
	private static final int LEFT = 1;
	private static final int BOTTOM = 2;
	private static final int RIGHT = 3;

	public BlackFrame() {
		this.setSize(400, 60);
		this.setAlwaysOnTop(true);
		this.setUndecorated(true);
		this.setLayout(new BorderLayout());
		this.addMouseListener(this);
		this.addMouseMotionListener(this);
		this.getContentPane().setBackground(Color.BLACK);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}

	public void paint(Graphics g) {
		super.paint(g);
		Graphics2D g2 = (Graphics2D) g;
		g2.setColor(Color.BLACK);
		g2.fillRect(0, 0, this.getWidth(), this.getHeight());
	}

	public void mouseClicked(MouseEvent e) {
		// 鼠标右键
		if (e.getButton() == MouseEvent.BUTTON3) {
			System.exit(0);
		}
	}

	public void mouseEntered(MouseEvent e) {

	}

	public void mouseExited(MouseEvent e) {
	}

	public void mousePressed(MouseEvent e) {
		x1 = e.getX();
		y1 = e.getY();
		if (x1 < 4) {
			direction = LEFT;
		} else if (x1 > this.getWidth() - 4) {
			direction = RIGHT;
		} else if (y1 < 4) {
			direction = TOP;
		} else if (y1 > this.getHeight() - 4) {
			direction = BOTTOM;
		} else {
			direction = NONE;
		}
	}

	public void mouseReleased(MouseEvent e) {
		x2 = e.getX();
		y2 = e.getY();

	}

	public void mouseDragged(MouseEvent e) {
		x2 = e.getX();
		y2 = e.getY();
		if (direction == TOP) {
			this.setSize(this.getWidth(), this.getHeight() - y2);
			this.setLocation(this.getX(), this.getY() + y2);
		} else if (direction == LEFT) {
			this.setSize(this.getWidth() - x2, this.getHeight());
			this.setLocation(this.getX() + x2, this.getY());
		} else if (direction == BOTTOM) {
			this.setSize(this.getWidth(), this.getHeight() + (y2 - y1));
			y1 = y2;
			y1 = y2;
		} else if (direction == RIGHT) {
			this.setSize(this.getWidth() + (x2 - x1), this.getHeight());
			x1 = x2;
			y1 = y2;
		} else if (direction == NONE) {
			this.setLocation(this.getX() + (x2 - x1), this.getY() + (y2 - y1));
		}
	}

	public void mouseMoved(MouseEvent e) {
		int x = e.getX();
		int y = e.getY();
		if (x < 4 || x > this.getWidth() - 4) {
			this.setCursor(new Cursor(Cursor.W_RESIZE_CURSOR));
		} else if (y < 4 || y > this.getHeight() - 4) {
			this.setCursor(new Cursor(Cursor.N_RESIZE_CURSOR));
		} else {
			this.setCursor(null);
		}
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		new BlackFrame().setVisible(true);
	}