Name: yyT116575 Date: 02/08/2001


java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build
Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)

When you add a tooltip to a JLabel, you no longer can listen for MouseMotion
events in any Container behind that JLabel. For example, I added a JLabel to
the JFrame and added a MouseMotionListener to the JFrame. The JFrame sees the
MouseMotion events even when you move across the label. The minute you add a
tooltip to the JLabel, the MouseMotion events are not propogated to the JFrame.

The bug report #4234237 incorrectly closed this as not reproducible. Their
code added the listener to the label, not the JFrame or JPanel.

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

public class MyFrame extends JFrame {

  public MyFrame() {
    JLabel l1 = new JLabel("This is my label");

    /* comment out following line, then MouseEvent will be triggered
     * but not tooltip shows up.
     */
    l1.setToolTipText("tooltip1");

    this.addMouseMotionListener(new MouseMotionListener(){
      public void mouseDragged(MouseEvent e){
        System.out.println("Dragged " + e.getX() + " " + e.getY());
      }
      public void mouseMoved(MouseEvent e){
        System.out.println("Moved " + e.getX() + " " + e.getY());
      }
    });

    getContentPane().add(l1, BorderLayout.SOUTH);
    setSize(200,200);
    setVisible(true);
  }

  public static void main(String args[]){
    MyFrame m = new MyFrame();
  }
}
(Review ID: 116608)
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