Java Swing How to - Handle Ancestor change event with Swing AncestorListener

Question

We would like to know how to handle Ancestor change event with Swing AncestorListener.
Answer

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import java.awt.event.HierarchyEvent;
import java.awt.event.HierarchyListener;
// ww w .j  a  va  2 s  . c  om
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTabbedPane;
import javax.swing.event.AncestorEvent;
import javax.swing.event.AncestorListener;

public class Main {
  JTabbedPane tabbedPane = new JTabbedPane();
  JFrame f = new JFrame();
  JLabel label1 = new JLabel("Tab1");
  JLabel label2 = new JLabel("Tab2");
  JLabel label3 = new JLabel("Tab3");
  JLabel label4 = new JLabel("Tab4");

  public Main() {
    tabbedPane.addTab("Tab1", label1);
    tabbedPane.addTab("Tab2", label2);
    tabbedPane.addTab("Tab3", label3);
    tabbedPane.addTab("Tab4", label4);
    tabbedPane.setTabPlacement(JTabbedPane.TOP);
    tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);

    label1.addAncestorListener(new EventHandler());
    label2.addAncestorListener(new EventHandler());
    label3.addAncestorListener(new EventHandler());
    label4.addAncestorListener(new EventHandler());

    label1.addHierarchyListener(new EventHandler());
    label2.addHierarchyListener(new EventHandler());
    label3.addHierarchyListener(new EventHandler());
    label4.addAncestorListener(new EventHandler());

    label1.addComponentListener(new EventHandler());
    label2.addComponentListener(new EventHandler());
    label3.addComponentListener(new EventHandler());
    label4.addComponentListener(new EventHandler());

    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.add(tabbedPane, BorderLayout.CENTER);
    f.setPreferredSize(new Dimension(600, 400));
    f.pack();
    f.setVisible(true);
  }

  public static void main(String args[]) {
    Main frame = new Main();
  }
}

class EventHandler implements AncestorListener, ComponentListener,
    HierarchyListener {

  @Override
  public void ancestorAdded(AncestorEvent event) {
    System.out.println("CardlayoutTest.EventHandler.ancestorAdded()");
  }

  @Override
  public void ancestorMoved(AncestorEvent event) {
    System.out.println("CardlayoutTest.EventHandler.ancestorMoved()");
  }

  @Override
  public void ancestorRemoved(AncestorEvent event) {
    System.out.println("CardlayoutTest.EventHandler.ancestorRemoved()");
  }

  @Override
  public void hierarchyChanged(HierarchyEvent e) {
    System.out.println("Components Change: " + e.getChanged());
    if ((e.getChangeFlags() & HierarchyEvent.DISPLAYABILITY_CHANGED) != 0) {
      if (e.getComponent().isDisplayable()) {
        System.out.println("Components DISPLAYABILITY_CHANGED : "
            + e.getChanged());
      } else {
        System.out.println("Components DISPLAYABILITY_CHANGED : "
            + e.getChanged());
      }
    }
    if ((e.getChangeFlags() & HierarchyEvent.SHOWING_CHANGED) != 0) {
      if (e.getComponent().isDisplayable()) {
        System.out.println("Components SHOWING_CHANGED : " + e.getChanged());
      } else {
        System.out.println("Components SHOWING_CHANGED : " + e.getChanged());
      }
    }
  }

  @Override
  public void componentHidden(ComponentEvent e) {
    System.out.println(e.getComponent().getClass().getName() + " --- Hidden");
  }

  @Override
  public void componentMoved(ComponentEvent e) {
    System.out.println(e.getComponent().getClass().getName() + " --- Moved");
  }

  @Override
  public void componentResized(ComponentEvent e) {
    System.out.println(e.getComponent().getClass().getName() + " --- Resized ");
  }

  @Override
  public void componentShown(ComponentEvent e) {
    System.out.println(e.getComponent().getClass().getName() + " --- Shown");
  }
}