When location of component changed on screen?

Question

Hi,
I have Code that brings up a message in a JDialog under a JTextComponent. I calculate the bottom - left point of the TextComponent and set my Dialog to show up there. However I have a problem keeping it there when the window moves, the TextComponent moves or One of it's parents moves.
I need something that will tell me when the location on screen of the TextComponent changes.
Thanks,
Shaul

Answer 1

AncestorListener#ancestorMoved seems to work just fine.import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Point;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JWindow;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.border.LineBorder;
import javax.swing.event.AncestorEvent;
import javax.swing.event.AncestorListener;
public class TestGUI {
   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         @Override
         public void run() {
            new TestGUI().makeUI();
   public void makeUI() {
      JFrame frame = new JFrame();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setSize(400, 200);
      frame.setLayout(new FlowLayout());
      frame.add(new TextFieldWithPopup(10));
      frame.add(new TextFieldWithPopup(20));
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
class TextFieldWithPopup extends JTextField {
   JWindow message = new JWindow();
   private JLabel label;
   public TextFieldWithPopup(int columns) {
      super(columns);
      addFocusListener(new FocusListener() {
         @Override
         public void focusGained(FocusEvent e) {
            message.setVisible(true);
         @Override
         public void focusLost(FocusEvent e) {
            message.setVisible(false);
      label = new JLabel("This is the popup");
      label.setOpaque(true);
      label.setBackground(UIManager.getColor("ToolTip.background"));
      label.setBorder(new LineBorder(Color.BLACK));
      message.add(label);
      message.setAlwaysOnTop(true);
      addAncestorListener(new AncestorListener() {
         @Override
         public void ancestorAdded(AncestorEvent event) {
         @Override
         public void ancestorRemoved(AncestorEvent event) {
         @Override
         public void ancestorMoved(AncestorEvent event) {
            Point p = getLocationOnScreen();
            message.setSize(getSize());
            message.setLocation(p.x + getWidth(), p.y + getHeight());
}db