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.
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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