JTree RootHandles and TreeSelectionListener

Question

Hello!
I have the following problem
I create a tree using vector( the vector contains other vectors etc).
I also create a TreeSelectionListener that when I select the leafs of this tree,leafs to become nodes,expand and contain new leafs.
Unfortunately,when I use it, the listener is triggered only when I click
on the icons I use. If I click on the roothandle in front of the icon it does nothing and the roothandle disappears.I think this happens because it remains leaf.
Why the two clicks differ?
How can I make the roothandle to trigger with the listener?

Answer 1

Try this:
jt.addTreeWillExpandListener(new TreeWillExpandListener() {
    public void treeWillCollapse(TreeExpansionEvent e) {
    public void treeWillExpand(TreeExpansionEvent e) {
        // The tree
        JTree tree = (JTree) e.getSource();
        // Get parent of node that will be expanded
        TreePath path = e.getPath();
        TreeNode node = (TreeNode) path.getLastPathComponent();
        TreeNode parent = node.getParent();
        // Get nodes of path
        Object[] pathNodes = path.getPath();
        int lastNode = pathNodes.length - 1;
        // Find currently open node under parent
        Enumeration enum = parent.children();
        while ( enum.hasMoreElements() ) {
            DefaultMutableTreeNode kid = (DefaultMutableTreeNode)
                enum.nextElement();
            // Get path to kid
            pathNodes[lastNode] = kid;
            TreePath kidPath = new TreePath( pathNodes );
            if ( tree.isExpanded( kidPath ) ) {
                // Collapse this node
                tree.collapsePath( kidPath );
                // Remove its kids
                kid.removeAllChildren();
                // Add in dummy node so it still has kids
                DefaultMutableTreeNode placeholder = new
                    DefaultMutableTreeNode( "placeholder" );
                kid.add( placeholder );
                // Let model know it has changed
                ( (DefaultTreeModel) tree.getModel() ).
                    nodeStructureChanged( kid );
                // Done here
                break;
});