Re: Help with NSArrayController, NSTableView and NSOpenPanel

FROM : Kam Dahlin
DATE : Sat Jun 24 01:15:16 2006

Hey George,

So here is the answer on the NSOpenPanel and my having to add changes 
programatically to my NSArrayController.

Chris Hanson's blog has the answer:

http://chanson.livejournal.com/tag/patterns#entry_85659

I guess that NSMutableArray doesn't broadcast KVO messages and so in 
order to make it work, you have to use a
[[self mutableArrayValueForKey:@"myMutableArray"] addObject:myObject];

I updated my app to use these calls, and bingo, after I selected my 
source in my NSOpenPanel and hit OK, everything populated without 
having to make any extra calls to the NSArrayControllers.

Hope this helps, and thanks for you help.


Regards,

k

"Standing before you, to stand behind you, to tell you something I 
know nothing about."



On Jun 23, 2006, at 2:58 PM, Kamrin Dahlin wrote:

> Hey George,
>
> Just wanted to tell you that I finally got this working.
>
> I created a File class to represent the individual files of the 
> directories I am interested in, and then created another 
> NSArrayController to manage those.  I followed the MailDemo again, 
> exluding the NSObjectController and this time it all worked as 
> expected.
>
> The only thing I still don't understand is why I have to 
> programmatically add my DirectoryModel objects to my first 
> NSArrayController.  After I select the directory I am interested in 
> and hit OK on the NSOpenPanel, I have to run through a loop that 
> creates my DirectoryModel objects and then makes the 
> [arrayController addObject:dirModel] call.  I am sure there must be 
> away to do this with bindings, but I haven't found it yet.  I was 
> hoping that by simply creating my DirectoryModel objects that KVO 
> would handle adding their values to the first NSTableView through 
> the first NSArrayController, but maybe it doesn't work that way.
>
> Again, thx for the help -- nice to know that us newbies out here 
> have people willing to lend a experienced hand.
>
> Regards,
>
> kam
>
>
> -----Original Message-----
> From: George Orthwein [mailto:george.<email_removed>]
> Sent: Fri 6/23/2006 11:47 AM
> To: Kamrin Dahlin
> Cc: <email_removed>
> Subject: Re: Help with NSArrayController, NSTableView and NSOpenPanel
>
> You can achieve what you want by following the MailDemo example...
> instead of Mailboxes and Emails, you have directoryModels and
> directoryContents, so create another NSArrayController to manage the
> directoryContents array (set it up like the Emails controller).
> http://cocoadevcentral.com/downloads/MailDemo-000084-end.zip
> http://cocoadevcentral.com/articles/000084.php
>
> But now I'm confused as you about your original question. Take the
> MailDemo example... I played around with it and I can't figure out
> why this binding for a table column doesn't work:
> Mailboxes->selection->emails.properties.address
>
> When this line in the controller gets the array fine:
> NSLog(@"log: %@",[mailBoxController
> valueForKeyPath:@"selection.emails.properties.address"]);
>
> Apparently, "mailboxes.selection.emails" is KVO compliant, but
> "mailboxes.selection.emails.properties" is not.
>
> I don't know enough to explain exactly why. Maybe someone can clear
> this up and we'll both learn something. :)
>
> George
>
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