On 5/15/09 11:52 AM, "Mike Abdullah" <cocoa...@mikeabdullah.net> wrote:
> If you have no idea what the First Responder is, you are clearly out
> of your depth. Step back and read up on the Responder Chain. It is a
> very important concept and central to Cocoa.
>
> Mike Abdullah.
>
I know what a First Responder is, I just do not know, in this instance,
which object it is. The debugger shows a call to openRecentDocument: in the
call chain and ascribes it to NSDocumentController (but marked as
"NSPrivate"). Hence, I tried using my override of NSDocumentController to
capture this menu event although I was aware that openRecentDocument: was
not in the corresponding API.
openRecentDocument: is so far the only method I have seen that comes close
to being what I was looking for.
I'm still looking.
> On 15 May 2009, at 16:01, McLaughlin, Michael P. wrote:
>
>> In a Cocoa Document project (latest Xcode), I want to have only one
>> document
>> open at a time. I thought that I could do this by subclassing
>> NSDocumentController but I have been only partially successful. For
>> instance, just as a test, the subclass code contains
>>
>> -(BOOL)validateUserInterfaceItem:(id < NSValidatedUserInterfaceItem
>>> )sender
>> {
>> SEL a = [sender action];
>>
>> if (a == @selector(newDocument:))
>> return NO;
>> if (a == @selector(openRecentDocument:))
>> return NO;
>>
>> return [super validateUserInterfaceItem:sender];
>> }
>>
>> The disabling of newDocument: works but the second test fails. It
>> appears
>> that the subclass receives only newDocument: and openDocument:
>> actions, not
>> openRecentDocument:
>>
>> Moreover, IB says only that Open Recent goes to First Responder and
>> I have
>> no idea what that First Responder is (else I might be able to
>> subclass it).
>>
>> There must be an easy way to do all of this. Could someone point me
>> to a
>> code example somewhere? Or a good description?
>>
>> TIA.
>>
>> --
>> Mike McLaughlin
>>
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>
--
Mike McLaughlin
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