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

I have a simple solution from my project. Here is my undecorated JDialog class.

public class TimerDialog extends JDialog {
// some fields here
private Point mouseClickPoint; // Will reference to the last pressing (not clicking) position

private TimerDialog() {
    initComponents();
    addEventsForDragging();
}

private void addEventsForDragging() {
    // Here is the code does moving
    addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent e) {
            mouseClickPoint = e.getPoint(); // update the position
        }

    });
    addMouseMotionListener(new MouseAdapter() {
        @Override
        public void mouseDragged(MouseEvent e) {
            Point newPoint = event.getLocationOnScreen();
            newPoint.translate(-mouseClickPoint.x, -mouseClickPoint.y); // Moves the point by given values from its location
            setLocation(newPoint); // set the new location
        }
    });
}

private void initComponents() {
    setLayout(new FlowLayout());
    // adding components
    setDefaultCloseOperation(DISPOSE_ON_CLOSE);
    setAlwaysOnTop(true);
    setUndecorated(true);
    setResizable(false);
    pack();
}
}