On Sep 28, 2012, at 8:33 AM, Alex Zavatone <z...@mac.com> wrote:
>
> On Sep 27, 2012, at 10:42 PM, Joseph M. Wollard wrote:
>
>> I'm pretty sure I'm doing something wrong here. I have an NSTreeController
>> bound to the 'value' of an NSOutlineView's table column. The
>> NSTreeController's content is then bound to a property of one of my classes
>> which feeds it an appropriate hierarchy of NSMutableDictionary objects. So,
>> dict -> tree -> outline. All data is being displayed beautifully in the
>> outline view.
>>
>> I'd like to observe a notification when a user edits (renames) an item in
>> the outline view that tells me the old and new values. I'm getting
>> notifications, but the old and new values are always null. For what it's
>> worth, I'm currently observing the "content.name" key path of the
>> NSTreeController instance - not sure if that makes a difference.
I think you're spot on with that one. I didn't realize that until after I sent
this email last night, however I'm still not sure how to solve the issue
(a.k.a. determine the correct key path). Here's an example of my data structure:
(
{
"name":"Boys",
"child": (
{
"name":Bill",
"child": ()
},
{
"name":"Steve",
"child":()
}
)
},
{
"name":"Girls",
"child": (
{
"name":"Anna",
"child":()
},
{
"name":"Bella",
"child":()
}
)
}
)
In my outline view, "Girls" and "Boys" are group headings and are immutable.
However, I want the names, "Anna", "Belle", "Bill" and "Steve" to be mutable
(which they are), but *those* are the properties I need to observe. Given that
this structure is in an NSTreeController, what is the proper keypath for
something like this? I'm pretty sure I just don't know the syntax, because it
seems like it should be something like
"content.chi...@distinctunionofarrays.name", but when I do that I'm pretty sure
I can hear the notification center giggling at me somewhere off in the distance.
>>
>
> Seems like there's something that's not being passed, observed or called
> properly. Unlike when calling a unimplemented method in an object which
> crashes Objective C, I've found out that notifications of the wrong method
> name don't crash, but simply act as if nothing has happened. What has
> happened was that a notification was issued, but the method might have been
> misspelled and the program merrily continues without crashing but without
> telling you that there was no method to intercept and process that
> notification. That happened to me a few weeks ago. That doesn't sound like
> your problem, but thought that might help.
>
> But, if the observed and new values are null, I'd guess that your reference
> to content.name isn't the correct reference to the object. Try tracing
> through the debugger to see where it thinks it's getting the value from.
>
>
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