🚀 go-pugleaf

Leo Cohen wrote in message <3677EFE9.F585563F@cs.virginia.edu>...
>Using JTree, I can succesfully initialize a tree using the default tree
>model and DefaultMutableTreeNode. After the initialized tree is on the
>screen, how do I add a new node to the tree?
>


Sorry for continuing our thread in this group, but it seemed that the
java.language group was emptied out somehow.  Hopefully it's just my setup.
Anyway, since I use such a heavily customized subclass of JTree, I left out
the part about refreshing the tree after adding nodes.  In your case, you
were using a DefaultTreeModel, so you can do the following typecast:

DefaultTreeModel model = (DefaultTreeModel)tree.getModel();

You can use this class to refresh items after changing nodes.  There are
several methods, depending on what you change in the nodes.
reload(TreeNode) will work to completely refresh your tree.  If you use the
JTree (or any Swing component for that matter), you might consider making
your own custom subclass to handle these updates automatically that is more
programmer friendly.
In the case of my JTree subclass, I also subclass TreeNode so that changes
in a node (adding children) will automatically refresh the tree
appropriately, unless I have a "hold painting" flag turned on.  I felt that
generally, I wanted the tree to refresh as I added the nodes, but sometimes
I wanted to add several hundred nodes without the refresh in between each
node.

Hope this helps.

Jason Burton