NSArrayController / NSTableView questions
-
I've got an application where I want an _ordered_ list of entities on
the many side of a one to many relationship. The result of the
master entity selection's entity is a set, which indicates to me the
order is probably arbitrary (is that true?). One solution I am
considering is to add a numeric sorting attribute to this table, and
to subclass the array controller to handle the
insertObject:atArrangedObjectIndex: method. Is this really
necessary? And how do I (or can I) bind an NSTableView with a
sortDescription to express this? Or would that be moot if I subclass
the array controller?
Using the result of dropping an entity into a window as an example, I
have some questions about what is going on. Does this "take over"
the dataSource of the NSTableView? What is the dataSource when this
is happening? The controller? I'm trying to figure out how to
support dragging in the NSTableView to reorder the items. Also, I'm
noticing the NSTableColumns are all individually bound to the various
arrangedObject.key.path expressions. How does this come together for
the entire NSTableView itself, which I am noticing is not bound to
anything? -
On Sep 5, 2005, at 2:11 PM, Paul Forgey wrote:
> Using the result of dropping an entity into a window as an example,
> I have some questions about what is going on. Does this "take
> over" the dataSource of the NSTableView? What is the dataSource
> when this is happening? The controller? I'm trying to figure out
> how to support dragging in the NSTableView to reorder the items.
> Also, I'm noticing the NSTableColumns are all individually bound to
> the various arrangedObject.key.path expressions. How does this
> come together for the entire NSTableView itself, which I am
> noticing is not bound to anything?
<http://homepage.mac.com/mmalc/CocoaExamples/controllers.html>
mmalc -
That answered my immediate confusions about bindings. Thank you!
I'd still like to know about the collections in to-many
relationships. Is the order preserved or is it arbitrary?
On Sep 5, 2005, at 2:47 PM, mmalcolm crawford wrote:
>
> On Sep 5, 2005, at 2:11 PM, Paul Forgey wrote:
>
>
>> Using the result of dropping an entity into a window as an
>> example, I have some questions about what is going on. Does this
>> "take over" the dataSource of the NSTableView? What is the
>> dataSource when this is happening? The controller? I'm trying to
>> figure out how to support dragging in the NSTableView to reorder
>> the items. Also, I'm noticing the NSTableColumns are all
>> individually bound to the various arrangedObject.key.path
>> expressions. How does this come together for the entire
>> NSTableView itself, which I am noticing is not bound to anything?
>>
>
> <http://homepage.mac.com/mmalc/CocoaExamples/controllers.html>
>
> mmalc
>
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-
On Sep 5, 2005, at 3:04 PM, Paul Forgey wrote:
> I'd still like to know about the collections in to-many
> relationships. Is the order preserved or is it arbitrary?
Arbitrary (NSSet is unordered), but I won't have time to address the
question until this evening...
It's come up before, though, so check the archives.
mmalc -
In the section about how to disable all sorting in an NSTableView by
manually binding the table view's content and selectionIndex, for
some reason this breaks my table column using an NSPopupButtonCell.
The contents of the popup are now apparently the description: method
strings of the to-one entities rather than the contentValues binding
for the column. I get this output:
-[NSManagedObject isEqualToString:]: selector not recognized [self =
0x351020]
On Sep 5, 2005, at 2:47 PM, mmalcolm crawford wrote:
>
> On Sep 5, 2005, at 2:11 PM, Paul Forgey wrote:
>
>
>> Using the result of dropping an entity into a window as an
>> example, I have some questions about what is going on. Does this
>> "take over" the dataSource of the NSTableView? What is the
>> dataSource when this is happening? The controller? I'm trying to
>> figure out how to support dragging in the NSTableView to reorder
>> the items. Also, I'm noticing the NSTableColumns are all
>> individually bound to the various arrangedObject.key.path
>> expressions. How does this come together for the entire
>> NSTableView itself, which I am noticing is not bound to anything?
>>
>
> <http://homepage.mac.com/mmalc/CocoaExamples/controllers.html>
>
> mmalc
>
> _______________________________________________
> Do not post admin requests to the list. They will be ignored.
> Cocoa-dev mailing list (<Cocoa-dev...>)
> Help/Unsubscribe/Update your Subscription:
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>
> This email sent to <paulf...>
>
-
I also reproduced this with the ToDo sample application. Using this
method to disable sorting in a table view is extremely non-obvious.
Is there an easier way to do this?
On Sep 5, 2005, at 3:16 PM, Paul Forgey wrote:
> In the section about how to disable all sorting in an NSTableView
> by manually binding the table view's content and selectionIndex,
> for some reason this breaks my table column using an
> NSPopupButtonCell. The contents of the popup are now apparently
> the description: method strings of the to-one entities rather than
> the contentValues binding for the column. I get this output:
> -[NSManagedObject isEqualToString:]: selector not recognized [self
> = 0x351020]
>
>
-
Sorry to keep replying to myself. I'm finally starting to understand
this whole thing.
[tableView unbind:@"sortDescriptors"] in my custom array controller's
awakeFromNib (after [super awakeFromNib]) did the trick.
Further, I implemented arrangeObjects: using my own private sort
descriptor (since I explicitly need these contents in a strict
order). If I instead set the sort descriptor to be what my version
of arrangeObjects: would do, the nature of KVO seems to hook the sort
descriptors back up to the table view and again allows sorting on any
of the columns.
I'm now overriding insertObject:atArrangedObjectIndex: to take care
of the other half.
I know this is an unusual situation. Normally it makes sense to
allow the flexibility and let the arbitrary sort features do their
job. Maybe a worthwhile enhancement to Cocoa would be some sort of
relationship option and corresponding controller introduced to
provide an ordered collection.
On Sep 5, 2005, at 5:43 PM, Paul Forgey wrote:
> I also reproduced this with the ToDo sample application. Using
> this method to disable sorting in a table view is extremely non-
> obvious. Is there an easier way to do this?
>
> On Sep 5, 2005, at 3:16 PM, Paul Forgey wrote:
>
>
>> In the section about how to disable all sorting in an NSTableView
>> by manually binding the table view's content and selectionIndex,
>> for some reason this breaks my table column using an
>> NSPopupButtonCell. The contents of the popup are now apparently
>> the description: method strings of the to-one entities rather than
>> the contentValues binding for the column. I get this output:
>> -[NSManagedObject isEqualToString:]: selector not recognized [self
>> = 0x351020]
>>
>>
>>
>
> _______________________________________________
> Do not post admin requests to the list. They will be ignored.
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