Moving undecorated window by clicking on JPanel

You can place another panel over the panel with the border, leaving the border visible.Use the following code to move your window.

public class MotionPanel extends JPanel{
    private Point initialClick;
    private JFrame parent;

    public MotionPanel(final JFrame parent){
    this.parent = parent;

    addMouseListener(new MouseAdapter() {
        public void mousePressed(MouseEvent e) {
            initialClick = e.getPoint();
            getComponentAt(initialClick);
        }
    });

    addMouseMotionListener(new MouseMotionAdapter() {
        @Override
        public void mouseDragged(MouseEvent e) {

            // get location of Window
            int thisX = parent.getLocation().x;
            int thisY = parent.getLocation().y;

            // Determine how much the mouse moved since the initial click
            int xMoved = (thisX + e.getX()) - (thisX + initialClick.x);
            int yMoved = (thisY + e.getY()) - (thisY + initialClick.y);

            // Move window to this position
            int X = thisX + xMoved;
            int Y = thisY + yMoved;
            parent.setLocation(X, Y);
        }
    });
    }
}

I've been working with this code for a while now to make a custom titlebar for undecorated windows. P.S.:You can generalize this example by extending JComponent instead of JPanel.