Moving a JFrame with custom title bar

Question

How can I move a JFrame having a custom title bar?

I remove the default title bar and I did my own design. This is how it looks like:

I want to know how to drag a JFrame when the cursor is placed on the title bar only and not the whole frame. I've searched already and I have seen a lot of samples but I still don't get it. Do you guys have any simple code that I can understand?

I haven't started the code yet since I don't know how to start it. All I know is that, it is about mouseDragged or MouseMotionListener.

Answer 1

I implemented the following:

public class DragFrame extends JFrame {

  int mpX, mpY;

  public DragFrame() {

    addMouseListener( new MouseAdapter() {
        @Override
        public void mousePressed( MouseEvent e ) {
          mpX = e.getX();
          mpY = e.getY();
        }
    } );

    addMouseMotionListener( new MouseMotionAdapter() {
        @Override
        public void mouseDragged( MouseEvent e ) {
          setLocation(
              getLocation().x + e.getX() - mpX,
              getLocation().y + e.getY() - mpY );
        }
    } );
  }
}

Thanks to @peeskillet for giving the crucial link to Drag and Resize undecorated JFrame with the inspiration to save the mouse position on mousePressed(...).