2016-08-10 19:05 GMT+02:00 Offray Vladimir Luna Cárdenas < offray.l...@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. > > 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 >> >> >> >> > >
