Re: Bindings and Collections
Re: Bindings and Collections
- Subject: Re: Bindings and Collections
- From: Phil Frost <email@hidden>
- Date: Mon, 5 Dec 2005 09:19:42 -0500
On Sun, Dec 04, 2005 at 06:22:47PM +1100, Kiel Gillard wrote:
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Hi all!
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I am starting to come to terms with Cocoa bindings. I am not using
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Core Data at the moment, just establishing my skills with bindings
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first. I am wondering how to allow my NSArrayController or
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NSTreeController to add objects to it's collection that are of a
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different class.
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For example, I would like to have an NSOutlineView such as the one in
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Mail and in iTunes, where a user can group child objects in their
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desired fashion. Currently, I have a NSTreeController and a
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NSOutlineView that allows me to build a tree of unrestricted depth
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where each object is an instance of a single kind of class.
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I would like the tree to terminate after the second level (ie: Group
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x > {Leaf 1, Leaf 2... Leaf n}). I have a feeling that all I need to
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do is specify and implement a leafKeyPath accessor method (or maybe
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all I will need to do is set the childrenKeyPath value) to restrict
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the depth of my tree.
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I would also like the class of the leaf objects to be of a different
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class to that of a group object. But how do I tell my
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NSTreeController to add an object of a specific class to the
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selectedObject's leaf item array when the selectedObject is a Group
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item? Do I override newObject or do I send the controller a
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setObjectClass: message if the selection of the outline view is, or
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changes to, an object of the Group class?
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Any help would be much appreciated! Thank you and please forgive my
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n00bness :-)
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Kiel :-)
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"Every minute spent angry is sixty seconds of happiness wasted."
It's undocumented, but you might find it useful to override
-[NSTreeController newChildObject]. It works just like newObject except
is called only for nodes with depth > 1.
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