On Aug 25, 2011, at 18:17 , Vik Rubenfeld wrote:
> Going through these requirements, it appears my app is fulfulling all of
> them. My undo menu item has its Sent Action set to undo: in First Responder.
> First Responder at the time of the anomaly is an NSDocument called
> myQuestionnaireEditor. This can be verified because the Cut and Paste menu
> items also have their Sent Actions set to First Responder, and
> validateMenuItem method in myQuestionnaireEditor is called for them as
> expected.
>
> myQuestionnaireEditor does have a method for implementing undo:
>
> -(IBAction)undo:(id) sender {
> [[self undoManager] undo];
> }
>
> myQuestionnaireEditor does implement validateMenuItem:
>
> - (BOOL)validateMenuItem:(NSMenuItem *)menuItem {
>
> NSLog(@"validateMenuItem - %@", [menuItem title]);
> BOOL returnValue = NO;
>
> if ([menuItem action] == @selector(undo:)) {
> return [[self undoManager] canUndo];
> }
>
> {......}
> return [super validateMenuItem:menuItem];
> }
Configuring the Undo menu item with action 'undo:' tells the frameworks that
this is *the* undo menu item, so it becomes one element of a standard undo UI
mechanism implemented in NSWindow. Under these circumstances, the menu item
(and especially its validation) isn't yours to mess with. The proper way to
provide an undo manager object to this mechanism is to use the
'windowWillReturnUndoManager:' window delegate method.
OTOH, if you want to take implement the entire mechanism yourself, then you
should use a custom action such as 'myUndo:' for the Undo menu item. That
means, as far as the frameworks know, you app doesn't have (standard) undo, and
the action/validation should work in the normal way.
If the above code really is your implementation, then the former technique is
probably the correct one. (It will, for example, allow you to set Undo action
names normally, so you won't have to modify the menu item times directly
yourself). If your code needs to do something more complicated than you're
showing here, then use the latter technique, and you're on your own for
implementing every detail of the UI.
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