On May 15, 2009, at 08:01, 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.
...
There must be an easy way to do all of this. Could someone point me
to a
code example somewhere? Or a good description?
If you mean exactly what you say, then I'd suggest that trying to
enforce your restriction by disabling menu items is doomed to failure.
There are plenty of ways that a NSDocumentController method can be
called to open a document that *don't* involve a menu or even an
IBAction method.
A better approach would be for your NSDocument subclass instances to
check, in initWithType: or one of the ReadFrom... methods, if a
document already exists (via [NSDocumentController documents]), and
simply return an error if so. [Actually, since NSDocumentController
has lousy error reporting, you should report the error yourself with
something like [NSApp presentError:] and return a "user cancelled"
error to suppress the standard NSDocumentController complaint.]
In that case, there's really no need to mess with the menus at all. As
you've already seen, the mechanism for handling the Open Recent
submenu is private, so there's nothing there to rely on. (If you're
determined to do that, you could get the same effect by disabling the
Open Recent menu item itself.)
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