I seem to have a very simple question, but the answer is eluding me
for some odd reason, but here goes:
Suppose I have two NSArrayControllers, ac1 and ac2. Suppose now that
I have a third controller ac3, whose content array is dependent on both
ac1.selection and ac2.selection (or some keypath therein). Since I
can't bind ac3 to both ac1 and ac2 at the same time, I have a class
which has a dependent key. In particular, suppose I have the following:
@interface Foo {
IBOutlet NSArrayController* ac1;
IBOutlet NSArrayController* ac2;
}
/* ... */
@end
@implementation Foo
- (id) ac1Selection { return [[ac1 selection] valueForKey:@"bar"]; }
- (id) ac2Selection { return [[ac2 selection] valueForKey:@"baz"]; }
+ (NSSet*) keyPathsForValuesAffectingAc3ContentArray {
return [NSSet setWithObjects:@"ac1Selection", @"ac2Selection", nil];
}
- (NSArray*) ac3ContentArray {
/* Do stuff using -ac1Selection and -ac2Selection */
}
@end
(I hope I wired the ac3ContentArray key dependency correctly...)
The part where I'm not getting is how to represent the fact that -
ac1Selection, say, is dependent on ac1.selection. Is it as simple as
implementing +keyPathsForValuesAffectingAc1Selection as something
like...
+ (NSSet*) keyPathsForValuesAffectingAc1Selection {
return [NSSet setWithObjects:@"ac1.selection", nil];
}
... or do I have to do something more complicated?
On the side, suppose we also have things the other way around: if ac3
has some attribute with some keypath that could alter the selection of
ac1 and ac2, what should I do? (Related to this: what if ac2 itself
depends on ac1?)
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