[Pharo-users] Spec > TreeModel: Updating the tree selection after a deletion

[Offray Vladimir Luna Cárdenas]

Hi,

I have a Spec TreeModel to represent the GUI of a grafoscopio notebook.
The message that deletes nodes is something like this:

============

GrafoscopioNotebook>>removeNode
    | nodeToDelete |
    nodeToDelete := tree selectedItem content.
    nodeToDelete parent removeNode: nodeToDelete.
    tree selectedItem: tree selectedItem parentNode.
    tree needRebuild: true.
    tree roots: tree roots.
    self buildWithSpecLayout: self class defaultSpec.

=============

And its working fine in the sense that it deletes the selected node, but 
after the deletion the contents of the old node are showed no matter if 
I change the node selection on the tree. I would like to manage 
selections in a smart way, so if I add a new node to the notebook, the 
new node gets the selection. If I delete a notebook node, the previous 
node gets selected or the parent if no more siblings are encountered and 
so on. There is some simple example to look for, about managing and 
updating selections in a TreeModel interface?

Thanks,

Offray