Hi,
I have been fighting with this for several hours until now. I can't
understand how to manage change on selections on TreeModels with Spec,
which is really frustrating....
Here is what I have:
GrafoscopioNotebook>>initializePresenter
tree whenSelectedItemChanged: [ :item |
self updateBodyFor: item.
header whenTextChanged: [ :arg |
(tree selectedItem content header) = arg
ifFalse: [
(tree highlightedItem) content header: arg.
tree roots: tree roots]]]
GrafoscopioNotebook>>updateBodyFor: item
item
ifNotNil: [ self changeBody: item ]
ifNil: [ self inform: 'Nil node' ]
and #changeBody: deals with putting a textual or code pane according to
some tags on the selected node (and it's working properly).
The problem seems that when I add/delete nodes to my tree, or while
changing the selection between nodes, the item variable becomes
temporarily nil and I can't update the contents of the body to
correspond to the current selection. I would like to say explicitly that
a new tree added node gets the selection and that the deletion of nodes
gives selection to its siblings or parent (if there are not siblings)
and that node body pane should be updated accordingly.
Again, any hint would be really valuable... I'll take a break from the
computer to dissipate current frustration... Pharo is generally a happy
productive place... but not today :-/... anyway some hits are part of
learning to play with it.
Cheers,
Offray
On 07/08/16 16:11, Offray Vladimir Luna Cárdenas wrote:
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
