2016-08-10 19:12 GMT+02:00 Nicolai Hess <[email protected]>:
>
>
> 2016-08-10 19:05 GMT+02:00 Offray Vladimir Luna Cárdenas <
> [email protected]>:
>
>> 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
>>>
>>>
>>>
>>>
>>
>>
>
