The lazy loading should be part of your TreeModel implementation. Also
make sure the TreeModel fires proper events on the listeners.
-Matej
On 8/3/07, James McLaughlin <[EMAIL PROTECTED]> wrote:
> Hi Doug,
> First I would make sure your TreeNode implementation creates children
> lazily. You probably should only create children when children() is
> actually called and provide logic for isLeaf and getChildCount() that
> don't require creating the children.
>
> You can create the initial state for the tree by overrriding
> newTreeState(). I usually do something like this:
>
> protected ITreeState newTreeState()
> {
>
> ITreeState state = new DefaultTreeState();
> state.collapseAll();
> TreeModel treeModel = (TreeModel) getModelObject();
> OutLineNode root = (OutLineNode) treeModel.getRoot();
> if(null != childNodeExpansionStrategy) {
> childNodeExpansionStrategy.expandNode(root, state);
> } else {
> if (log.isInfoEnabled()) {
> log.info("childNodeExpansionStrategy is NULL.
> expanding root only");
> }
> state.expandNode(root);
> }
> return state;
> }
>
> where childNodeExpansionStrategy holds the logic to determine the
> level to expand to, and recurses through the nodes to get there,
> calling state.expandNode(node) until it does.
>
> best,
> jim
>
> On 8/3/07, Doug Leeper <[EMAIL PROTECTED]> wrote:
> >
> > I would like to dynamically add tree nodes to an AbstractTree instead of
> > loading the entire tree up front. Not sure how do this. I thought I would
> > be able to override nodeExpanded(TreeNode) and check if the node had been
> > "loaded" ...if not then load 1 level deep. However, all ITreeStateListeners
> > are final in AbstractTree.
> >
> > Is there a way to do this without creating my own version of AbstractTree?
> > Better yet...is there an example of this...it could mimic the file structure
> > of your computer.
> >
> > Thanks
> > - Doug
> > --
> > View this message in context:
> > http://www.nabble.com/Dynamically-adding-tree-nodes-upon-selection-tf4212940.html#a11984616
> > Sent from the Wicket - User mailing list archive at Nabble.com.
> >
> >
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