Mac OS X: MouseEvents not firing for background windows on mouse drag

Question

When the mouse is pressed and dragged in a foreground window, mouse events in the other windows don't seem to fire (e.g. mouseEntered, mouseExited). I'm wondering if anyone else has had this problem and if there are any known workarounds. I'm using JVM 1.5 on 10.4.11.
Below is a sample piece of code that works in Windows but fails on the Mac. The window in which the mouse has entered will highlight red, while all other windows remain blue. When the mouse is depressed and dragged in a window / across windows, the source window will highlight green. On the Mac, when the mouse is depressed, the background windows will not highlight red when moused over.
import java.awt.Color;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MouseDragBugTest extends JFrame implements MouseListener{
     private JPanel panel;
     private Color color;
     private boolean mouseDownInThisPanel;
     private static int location=100;
     public MouseDragBugTest(){
          this.setSize(200,200);
          this.setLocation(location,100);
          mouseDownInThisPanel=false;
          location+=210;
          color=Color.BLUE;
          panel=new JPanel(){
               public void paint(Graphics g){
                    g.setColor(color);
                    g.fillRect(0,0,panel.getWidth(),panel.getHeight());
          panel.addMouseListener(this);
          this.getContentPane().setLayout(new GridLayout(1,1));
          this.getContentPane().add(panel);
          this.setVisible(true);
     public void setColor(Color c){
          color=c;
          panel.repaint();
     public void mouseEntered(MouseEvent arg0) {
          if (!mouseDownInThisPanel)
               setColor(Color.RED);
     public void mousePressed(MouseEvent arg0) {
          mouseDownInThisPanel=true;
          setColor(Color.GREEN);
     public void mouseExited(MouseEvent arg0) {
          if (!mouseDownInThisPanel)
               setColor(Color.BLUE);
     public void mouseReleased(MouseEvent arg0) {
          mouseDownInThisPanel=false;
          setColor(Color.BLUE);
     public void mouseClicked(MouseEvent arg0) {}
     public static void main(String[] args){
          new MouseDragBugTest();
          new MouseDragBugTest();
          new MouseDragBugTest();
}Edited by: jbhansen on Jun 4, 2008 9:00 AM - added in code tags.

Answer 1

Can anyone else reproduce this issue?