Re: Adding methods to dataSource

• Subject: Re: Adding methods to dataSource
• From: Björn Carlström <email@hidden>
• Date: Fri, 2 Jul 2004 23:39:32 +0200

On Jul 1, 2004, at 11:49 PM, Bjvrn Carlstrvm wrote:

I'm subclassing NSOutlineView to add the possibility to delete rows through the delete key. How do I add a new method (deleteItem:) to the NSOutlineViewDataSource. Just calling it works of course but I get a warning that the method might not exist. Do I subclass the NSOutlineViewDataSource somehow ?

Just declare a new informal protocol with a name like MyOutlineViewDataSource that includes a declaration for your deleteItem: method:

@interface NSObject (MyOutlineViewDataSource)
- (void)deleteItem:(id)item;
@end

Informal protocols are really useful for this kind of thing.

-- Chris

--
Chris Hanson <email@hidden>
http://www.livejournal.com/users/chanson/
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