Moving undecorated window by clicking on JPanel

Question

Is there a possibility to move window by clicking on one of the panels in the window when that window is undecorated?

I have a main panel with matte border 40 pixels siz

Answer 1

This code works very well with single monitor. It uses a simple mouselistener and mouse motion listener, which do some basic algebra do move the frame.

class Frame extends JFrame{

    private int framePositionX, framePositionY, mousePositionX, mousePositionY, newMousePositionX, newMousePositionY;

    Frame(){

        addMouseListener(new MouseListener() {
            @Override
            public void mouseClicked(MouseEvent mouseEvent) {
                framePositionX = mouseEvent.getComponent().getX();
                framePositionY = mouseEvent.getComponent().getY();
                mousePositionX = mouseEvent.getX();
                mousePositionY = mouseEvent.getY();
            }
            @Override
            public void mousePressed(MouseEvent mouseEvent) {
                framePositionX = mouseEvent.getComponent().getX();
                framePositionY = mouseEvent.getComponent().getY();
                mousePositionX = mouseEvent.getX();
                mousePositionY = mouseEvent.getY();
            }
            @Override public void mouseReleased(MouseEvent mouseEvent) { }
            @Override public void mouseEntered(MouseEvent mouseEvent) { }
            @Override public void mouseExited(MouseEvent mouseEvent) { }
        });

        addMouseMotionListener(new MouseAdapter() {
            @Override
            public void mouseDragged(MouseEvent e) {
                newMousePositionX = e.getX();
                newMousePositionY = e.getY();
                int newFramePositionX = (newMousePositionX - mousePositionX)+ framePositionX;
                int newFramePositionY = (newMousePositionY - mousePositionY)+ framePositionY;
                e.getComponent().setLocation(newFramePositionX, newFramePositionY);
            }
        });

        setUndecorated(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
        setVisible(true);
    }
}