TreeDropTarget throws ClassCastException in showFeedback (Tree / TreeGrid cast)

[pete_by]

When a tree used as source and target widget in drag and drop operation, showFeedback may throw ClassCastException: cannot cast Tree to TreeGrid.
The problem lines are the following:

if (item != null && event.getDropTarget().getWidget() == event.getDragSource().getWidget()) {
        @SuppressWarnings("unchecked")
    TreeGrid<M> source = (TreeGrid<M>) event.getDragSource().getWidget(); // CCE!
   List<M> list = source.getSelectionModel().getSelection();

The problem that drag source is not a TreeGrid's implementation but rather Tree's one, though both of them have getSelectionModel method.

[Colin Alworth]

Thanks - there are a few other TreeGrid references in that class that don't make sense either. We'll update the thread when we have a fix available.

[darrellmeyer]

This is fixed in SVN (rev 1969). We have also added reordering tree and treegrid examples to the explorer demo. Changes will go out in our beta release this week.

[darrellmeyer]

Fixed in beta 1.