Demonstrating the AncestorListener
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Timer;
import java.util.TimerTask;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.event.AncestorEvent;
import javax.swing.event.AncestorListener;
public class AncestorTest {
public static void main(String args[]) {
final JFrame frame = new JFrame();
Container contentPane = frame.getContentPane();
JButton b = new JButton("Hide for 5");
ActionListener action = new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
frame.setVisible(false);
TimerTask task = new TimerTask() {
public void run() {
frame.setVisible(true);
}
};
Timer timer = new Timer();
timer.schedule(task, 5000);
}
};
b.addActionListener(action);
AncestorListener ancestor = new AncestorListener() {
public void ancestorAdded(AncestorEvent e) {
System.out.println("Added");
dumpInfo(e);
}
public void ancestorMoved(AncestorEvent e) {
System.out.println("Moved");
dumpInfo(e);
}
public void ancestorRemoved(AncestorEvent e) {
System.out.println("Removed");
dumpInfo(e);
}
private void dumpInfo(AncestorEvent e) {
System.out.println("\tAncestor: " + name(e.getAncestor()));
System.out.println("\tAncestorParent: "
+ name(e.getAncestorParent()));
System.out.println("\tComponent: " + name(e.getComponent()));
}
private String name(Container c) {
return (c == null) ? null : c.getName();
}
};
b.addAncestorListener(ancestor);
contentPane.add(b, BorderLayout.NORTH);
frame.setSize(300, 200);
frame.show();
}
}
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