Cursor Busy in JFileChooser

Question

I am using a JFileChooser to open directories, some of the directories can contain a lot of sub directories and it can take a while to update the display with the contents (5 seconds), but the JFileChooser doesnt show a busy cursor whilst doing this so can appear to the user that the directory is empty.
is this a bug in java , i havent found anything in the Bug Database. ?
Running on Windows JDK 1.5.

Answer 1

It should work if "parent" is a Window.
I do notice a problem if you navigate to an empty directory, in which case there is no
contentsChanged event and the wait cursor doesn't go away. I will investigate if there
is a solution for that.
Here is a complete example.
import java.awt.*;
import java.beans.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.*;
public class bug5010850 {
    public static void main(String[] args) throws Exception {
        SwingUtilities.invokeAndWait(new Runnable() {
            public void run() {
                final JFileChooser fc = new JFileChooser();
                FileChooserUI ui = fc.getUI();
                if (ui instanceof BasicFileChooserUI) {
                    fc.addPropertyChangeListener(new PropertyChangeListener() {
                        public void propertyChange(PropertyChangeEvent e) {
                            String s = e.getPropertyName();
                            if (s.equals(JFileChooser.DIRECTORY_CHANGED_PROPERTY)) {
                                setCursor(fc, Cursor.WAIT_CURSOR);
                    ListModel model = ((BasicFileChooserUI)ui).getModel();
                    model.addListDataListener(new ListDataListener() {
                        public void contentsChanged(ListDataEvent e) {
                            setCursor(fc, Cursor.DEFAULT_CURSOR);
                        public void intervalAdded(ListDataEvent e) { }
                        public void intervalRemoved(ListDataEvent e) { }
                fc.showSaveDialog(null);
            private void setCursor(JComponent comp, int type) {
                Window window = SwingUtilities.getWindowAncestor(comp);
                if (window != null) {
                    Cursor cursor = Cursor.getPredefinedCursor(type);
                    System.out.println(cursor);
                    window.setCursor(cursor);
        System.exit(0);
}