On Jun 9, 2008, at 11:07, Steve Nicholson wrote:
I have a document-based app in which I'm trying to bind the state of
NSMenuItems to values in my document's window controller. For
example, in the window's nib file, I have a checkbox bound to File's
Owner/autoscaleX. I'd like the menu item to have the same
functionality as that check box and to display the status for
whichever window is currently selected.
Since File's Owner is NSApplication in MainMenu.nib I get an
exception when I try to bind to autoscaleX. I tried adding an
autoscaleX action to FirstResponder and binding to that, but I still
get the exception.
I also tried not binding the menu item and just setting its action
to FirstResponder's autoscaleX action, but the menu item remains
disabled.
I'm sure there's an easy Cocoa way to do this, but I haven't been
able to dig it up in the docs or my searches.
Doing this through bindings involves re-inventing a bit of stuff that
NSResponder normally takes care of, but it need not be too difficult.
For example, you could:
-- Create an application delegate, if you don't have one already.
-- Give the application delegate a -
(NSWindowController*)currentDocWinController property.
-- In your window's delegate (the NSDocument or NSWindowController,
depending how it's set up, or possibly even something else),
implement windowDidBecomeMain and/or windowDidBecomeKey to invoke
'appDelegate. currentDocWinController = <the relevant window's
controller>', and windowWillClose to invoke 'appDelegate.
currentDocWinController = nil'.
-- Bind the menu item's state to File's Owner.delegate.
currentDocWinController.autoscaleX
The hardest part is step 3, since it must maintain the value of the
property correctly, and do so in a KVO-compliant manner, and avoid
race conditions when there might be multiple windows opening or closing.
Or something like that.
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to [EMAIL PROTECTED]
