On Jul 1, 2009, at 7:00 PM, Keary Suska wrote:
This has never been true. Right?
No, I would say it is usually true, but not always.
I would like very much to see a project in which it does work. The
documentation certainly says it works, but my efforts to make it work
suggest that the documentation is wrong. Have you ever seen a project
in which it works, or are you just relying on the documentation?
My custom window controller implements the action method for a
button, so it is the button's target, and it also implements -
validateUserInterfaceItem:, all according to the User Interface
Validation document. But my -validateUserInterfaceItem: method is
never called.
Implementing the action method isn't sufficient, BTW. The object
must also be the current target (i.e. first responder for nil-
targeted actions, or designated target). Also note that not all user
interface items do this--they must conform to the
NSValidatedUserInterfaceItem (or NSUserInterfaceValidations)
protocol, which IIRC NSButton does not. In fact, I think only menu
items and toolbar items do.
My controller is the target, which according to Apple's documentation,
and according to my understanding for many years, means simply that it
implements the button's action method. My controller does in fact
implement the action method. In addition, my controller is in the
responder chain, which is demonstrated by the fact that the action
method, which is connected to the First Responder proxy in Interface
Builder, executes correctly when I click the button. Also, I declare
the controller to conform to the NSUserInterfaceValidations protocol,
which it does because it implements the -validateUserInterfaceItem:
method. NSButton does conform to the NSValidatedUserInterfaceItem
protocol, as its header file confirms, and it does implement the -
action: and -target: methods required by that protocol.
So I think you are claiming this works because the documentation says
so. I'm saying the documentation is wrong because it doesn't work. I
would love to see a project proving me wrong. Can you show me one?
It does work if you've implemented a menu item that calls the same
action method, because the menu item validation protocol works as
advertised. That is, it falls back on -validateUserInterfaceItem: if
you don't implement -validateMenuItem. Toolbar item validation also
works, because, like menu item validation, it is wired to do so. So
don't send me any projects showing that menu items and toolbar items
work correctly. My complaint is that this technique doesn't work for
user interface items other than menu items and toolbar items, and that
the documentation claiming it does work is wrong.
--
Bill Cheeseman
b...@cheeseman.name
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