2016-08-10 19:12 GMT+02:00 Nicolai Hess <nicolaihess@gmail.com>:
2016-08-10 19:05 GMT+02:00 Offray Vladimir Luna Cárdenas < offray.luna@mutabit.com>:
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.
Hi Offray, I do remember that I tried this as well, I will if I can find out how far I got it to work.
a simiple example: |t nodeBlock | nodeBlock:= [:class | |node| node := TreeNodeModel new. node hasChildren:[ class subclasses isEmpty not]. node children: [class subclasses collect:[:subclass | nodeBlock value: subclass]]. node content: class]. t:=TreeModel new. t roots: (Morph subclasses collect:[:class | nodeBlock value:class]). t whenBuiltDo:[ t selectedItem:( t roots first selected:true;takeHighlight;yourself)]. t openWithSpec the important part is the "takeHighlight" and to call it after the widget is built
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