Listen for when a Component is Shown for the First Time

Question

I am trying to capture the very first moment when a component is shown on the screen without using \'dirty\' solutions as with use of a timer. Basically, I want to know the

Answer 1

Oddly, the ComponentListener works just fine when applied to the JFrame. Here is the altered source where I saw it work.

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

public class CompListenerTest
{
    static ComponentListener cL = new ComponentAdapter()
    {
        @Override
        public void componentShown(ComponentEvent e)
        {
            super.componentShown(e);
            System.out.println("componentShown");
        }
    };

    public static void main(String[] args)
    {
        JPanel p = new JPanel();
        p.setPreferredSize(new Dimension(300, 400));
        p.setBackground(Color.GREEN);

        System.out.println("initial test p="+p.isShowing());
        JPanel contentPane = new JPanel();
        contentPane.setBackground(Color.RED);
        contentPane.add(p);
        JFrame f = new JFrame();
        f.addComponentListener(cL);
        f.setContentPane(contentPane);
        f.setSize(800, 600);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
    }
}