Swing: positioning a popup from a JScrollPane

I have it JTable

inside JScrollPane

. I am creating a custom cell editor for one of the table columns and I want this editor to pop up by scrolling JList

. I did this using Popup

to show the new JScrollPane

containing JList

.

Everything works except for the position Popup

. My custom editor component looks basically like this:

public class CustomPanel extends JPanel {
    JTextField text = new JTextField();
    JList list = new JList();
    JScrollPane scroll = new JScrollPane(list);
    Component owner = null;
    public CustomPanel(Component owner) {
        this.owner = owner;
        add(text);
    }
    public void showPopup() {
        Popup p = PopupFactory.getPopup(owner, scroll, getX(), getY()+getHeight());
        p.show();
    }
}

      

        
        
        
      

    

It happens that getX()

they getY()

return the position of the table cell relative to the JScrollPane, holding it, and Popup

- the absolute position of the screen. Even if I pass owner

JScrollPane

which one they refer to, it doesn't work. I get the same problem if I use text.getX()

/ text.getY()

.

How can I place mine Popup

directly underneath TextBox

?

Slightly more background: The end goal is a multiple choice combo selection that displays all selected items in a comma-separated list. If something else similar already exists, please feel free to point me to it.

Edit: owner.getLocationOnScreen().y + getY()

Doesn't work when the scrollbar is anywhere but scrolls to the top. However, it just works getLocationOnScreen().y

. Problem solved, thanks.