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import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Main extends JPanel {
public void paintComponent(Graphics g) {
g.setColor(Color.black);
g.fillRect(0, 0, getWidth(), getHeight());
}
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setPreferredSize(new Dimension(300, 280));
Main ch = new Main();
frame.getContentPane().add(ch);
frame.setUndecorated(true);
MoveMouseListener mml = new MoveMouseListener(ch);
ch.addMouseListener(mml);
ch.addMouseMotionListener(mml);
frame.pack();
frame.setVisible(true);
}
}
class MoveMouseListener implements MouseListener, MouseMotionListener {
JComponent target;
Point start_drag;
Point start_loc;
public MoveMouseListener(JComponent target) {
this.target = target;
}
public static JFrame getFrame(Container target) {
if (target instanceof JFrame) {
return (JFrame) target;
}
return getFrame(target.getParent());
}
Point getScreenLocation(MouseEvent e) {
Point cursor = e.getPoint();
Point target_location = this.target.getLocationOnScreen();
return new Point((int) (target_location.getX() + cursor.getX()),
(int) (target_location.getY() + cursor.getY()));
}
public void mouseClicked(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
this.start_drag = this.getScreenLocation(e);
this.start_loc = this.getFrame(this.target).getLocation();
}
public void mouseReleased(MouseEvent e) {
}
public void mouseDragged(MouseEvent e) {
Point current = this.getScreenLocation(e);
Point offset = new Point((int) current.getX() - (int) start_drag.getX(),
(int) current.getY() - (int) start_drag.getY());
JFrame frame = this.getFrame(target);
Point new_location = new Point(
(int) (this.start_loc.getX() + offset.getX()), (int) (this.start_loc
.getY() + offset.getY()));
frame.setLocation(new_location);
}
public void mouseMoved(MouseEvent e) {
}
}
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