How to spin cursor during JTree long operation

Question

I have a JTree that uses my model class to load nodes as the user expands them (lazy load). But some nodes have so many children that it takes a long time for the JTree to expand the node (and display the children). I'd like to figure out how to display a spinning cursor so the user will know that something is happening. Otherwise it appears as though the app has locked up (for 10 - 15 seconds). Is there a way to do this easily?

Answer 1

Well here is what I did. It seems to do what I wanted to do (indicate to the user that the load is taking a while).
        tree.addTreeWillExpandListener(new TreeWillExpandListener() {
               public void treeWillCollapse(TreeExpansionEvent event)
                         throws ExpandVetoException {}
               public void treeWillExpand(TreeExpansionEvent event)
                         throws ExpandVetoException {
                    setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
        tree.addTreeExpansionListener(new TreeExpansionListener() {
               public void treeCollapsed(TreeExpansionEvent event) {
                    setCursor(Cursor.getDefaultCursor());
               public void treeExpanded(TreeExpansionEvent event) {
                    setCursor(Cursor.getDefaultCursor());
        });