[CS2/CS3] - TreeView observer attaching

Question

Hello,     I modified a sample called WLBCmp to create a list of checkboxes, but now I want to be able to observer this checkboxes selections throught my MakeNewDialogObserver which is used to observe my entire dialog. Now I added to resources:  Class {      kBaseTreeNodeWidgetBoss,      kTreeNodeWidgetBoss,      {           IID_IOBSERVER, kMakeNewDialogObserverImpl,      } },  It't working fain, but it's creating for each checkbox in my treeview extra instance of this MakeNewDialogObserver. I need to use one observer like for all other widgets on my dialog. Please does anybody know how to attach TreeView to widget to be able to observe checkboxes changes in the TreeView ?  Thanks, marxin

Answer 1

You could do either:
the keyword "static" allows to share data across all instances of your class. That would be bad programming style though.
Create a new Interface, add that to the tree view widget, and use IWidgetParent from within the observers to find the interface.
It is a typical beginner error to stuff all functionality into the observer. In short, if you have "state" in the observer you're wrong.
Keep the observers lean, limit functionality to
attach/detach/receiving
in Update, decoding: cast from void* into something meaningful
dispatch into functions with speaking name e.g. handleCheckboxToggled() and there
find the responsible boss, then interface
invoke the actual functionality in that interface
Dirk