Why isn't componentHidden called for my JPopupMenu?

Posted by heycam on Stack Overflow See other posts from Stack Overflow or by heycam
Published on 2010-06-14T03:25:45Z Indexed on 2010/06/14 3:32 UTC
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I want to be notified when my JPopupMenu is hidden — whether because an item was selected, the menu was dismissed, or setVisible(false) was called on it. Here is my test code:

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class A extends ComponentAdapter implements Runnable, ActionListener {
    private JButton b;

    public static void main(String[] args) {
        EventQueue.invokeLater(new A());
    }

    public void run() {
        JFrame f = new JFrame("Test");
        b = new JButton("Click me");
        b.addActionListener(this);
        f.add(b);
        f.pack();
        f.setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        JPopupMenu pm = new JPopupMenu();
        pm.addComponentListener(this);
        pm.add("Popup...");
        pm.add("...menu!");
        pm.show(b, 10, 10);
    }

    public void componentShown(ComponentEvent e) { System.out.println("componentShown"); }
    public void componentHidden(ComponentEvent e) { System.out.println("componentHidden"); }
}

Regardless of how I interact with the menu, neither of the two ComponentListener methods are being called. Why is that? Is there different/better/correct way of finding out when my JPopupMenu is hidden?

Thanks,

Cameron

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