Does NSObjectController's removeObject actually work?
NSArrayController's removeObject absolutely works ... but I suspect
that NSObjectController's is just a stub. If so, I will certainly
report that as a bug to Apple (either to be fixed or fixed in the
documentation) ... but I want to make sure my understanding is
correct before I do. My bet is that I'm wrong and not Apple. :)
Basically, I created a simple Cocoa application and did not add any
extra code to it ... just messed with its MainMenu.nib. In the nib,
I instantiated a NSObjectController object and left "Automatically
Creates Content" unchecked. Nextly, I created two buttons and set
the controller as their targets; I set the first button's action to
"add" in the controller, the other to "remove." My understanding is
that these actions invoke the "addObject" and "removeObject" methods
within the controller. I then created a controller key -- "value" --
keeping the controller's object class name set to
NSMutableDictionary. Finally, I bound a couple of user interface
widgets (a slider and text field) to "value" just for testing.
So I ran the app and it started out by behaving exactly as I
expected. With no selection object, the slider and text field were
inactive. I clicked on my "Add" button and immediately the widgets
came alive, working as normal. However, when I clicked on my
"Remove" button, nothing happened. It's my understanding that my
controller should have gone back to having no selection object and
that should have disabled my slider and text field. To test my
understanding, I bound two text fields to the controller's "canAdd"
and "canRemove" keys and re-ran the app. Here are the results:
App starts:
Selection object: None
Can add? Yes
Can remove? No
After click on Add button:
Selection object: Available
Can add? No
Can remove? Yes
After click on Remove button:
Selection object: (Still) Available
Can add? No
Can remove? Yes
I setup another simple application, this time using a table and an
NSArrayController and addObject and removeObject worked exactly as
advertised. canAdd and canRemove also reported exactly what I
expected. Now according to the documentation:
addObject and removeObject are synonymous with setContent ... with
removeObject passing nil as an argument. But I am not sure that it
really is passing nil.
Am I missing something?
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