Any way to filter an NSTreeController?

[Jens Alfke]

I'm using an NSTreeController bound to an NSBrowser to display a hierarchical data structure in my app. I now find I need to implement filtering, i.e. hiding items at all levels of the hierarchy that don't match some condition. Unfortunately it appears that only NSArrayController supports a - filterPredicate; there's no equivalent in NSTreeController. :-(

At this point it seems like my options are either

or





—Jens

(1) Add the filtering to my data model, i.e. have my content classes' - children methods filter their results … I don't want to do this because it prevents the same data model from appearing in two views with different filters. (2) Create a parallel hierarchy of filtered objects and give that to the tree controller … I don't want to do this because it having the proxy objects mimic the original ones to KVC / KVO will be a pain, but otherwise I have to change around all of the bindings in my nib. Is there some other alternative? I know NSTreeController already builds its own shadow hierarchy of NSTreeNodes … is there a way I can subclass NSTreeController or NSTreeNode to splice in the filtering?

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