Best way to stop a JTree selection change from happening?

Question

I have a dialog where each entry in a JTree has its corresponding options in a different panel, which is updated when the selection changes. If options for one of the entrie

Answer 1

I did not find a better way, but this approach works fine for me. I know in Delphi it was a very convenient event: "before changing selection" where you could very easily stop changing selection.

here is my java code with prevention of infinite recursion problem

    navTree.addTreeSelectionListener(new TreeSelectionListener() {

        boolean treeSelectionListenerEnabled = true;

        public void valueChanged(TreeSelectionEvent e) {
            if (treeSelectionListenerEnabled) {
                if (ok to change selection...) {
                    ...
                } else {
                    TreePath treePath = e.getOldLeadSelectionPath();
                    treeSelectionListenerEnabled = false;
                    try {
                        // prevent from leaving the last visited node
                        navTree.setSelectionPath(treePath);
                    } finally {
                        treeSelectionListenerEnabled = true;
                    }
                }
            }
        }
    });

always remember to remove all listeners you added, to prevent memory leaks.

here is another approach:

private class VetoableTreeSelectionModel extends DefaultTreeSelectionModel {
    public void setSelectionPath(TreePath path){
        if (allow selection change?) {
            super.setSelectionPath(path);
        }
    }
}
{
    navTree.setSelectionModel(new VetoableTreeSelectionModel());
}