Re: How does a binding know what it gets should be treated like an NSArray or not ? (Follow up)
Re: How does a binding know what it gets should be treated like an NSArray or not ? (Follow up)
- Subject: Re: How does a binding know what it gets should be treated like an NSArray or not ? (Follow up)
- From: email@hidden
- Date: Mon, 27 Feb 2006 09:49:30 -0800
On 2006/02/26, at 10:44, email@hidden wrote:
On 2006/02/26, at 6:06, Camillo Lugaresi wrote:
In general, it looks like you're making things harder for you than
they should be. It's not obvious why you would need a custom array
controller for that UI. This site has several examples of the
recommended way to do things: <http://homepage.mac.com/mmalc/
CocoaExamples/controllers.html>
Yes, your right, I was definitely making it much harder than it
needed to be.
In fact, one of the first places I went to for pointers was the
page you just mentioned (thanks to mmalc), but couldn't find the
solution to my specific problem there either.
................
So it turns out, my solution was standing in front of me the whole
time. Just let the proxy be a full proxy, not just for the derived
key value, but all key values of the wrapped object, and return an
array of managed objects wrapped in proxies from arrangedObjects.
Then I can bind the table view to all the keys from the same base
key path and get the results I wanted. It works perfectly.
I just wanted to follow up on myself, and post my discovery in case
any one else using self-made proxies in an NSArrayController. (Yes,
all 2 of you)
If one is going to wrap individual objects contained in an
NSArrayController, do not return them from -(id)arrangedObjects.
If you do, you'll lose sorting for any key-values the proxy adds to
the wrapped object. Sorting is done from -(NSArray *)arrangeObjects:
(NSArray *)objects.
So in arrangeObjects, you wrap each object in the "objects" array,
then pass that array to super's implementation of arrangeObjects and
return the array.
Like so:
-(NSArray *)arrangeObjects:(NSArray *)objects
{
//Objects in contents are now wrapped
NSArray *wrappedObjects = [self wrapObjectsInProxiesFromArray:objects];
//Pass to super to let it sort using keys provided by other UI
elements such as NSTableColumn
return [super arrangeObjects:wrappedObjects];
}
Chiao,
Andre
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