Re: Forcing a refresh on a bound control

FROM : David Dunham
DATE : Mon May 19 18:01:56 2008

On 18 May 2008, at 23:42, Scott Stevenson wrote:

>> I've got a key which is calculated (it's the number of topics 
>> which are filtered by a search string). As the user types into a 
>> search field, I need to update this derived value. How else can I 
>> let KVO know the calculated value has changed, so it can be 
>> displayed in the UI?

>
> In general, you can just set derived keys to be dependent on the 
> "real" key, and the change notifications happen automatically. On 
> Tiger, you use +setKeys:triggerChangeNotificationsForDependentKey: 
> in +initialize.
>
> Are you able to use this?



There is no other key -- it's a value calculated by applying a test 
to all topics and counting the number of YESes.

David Dunham    A Sharp, LLC
Voice/Fax: 206 783 7404    http://a-sharp.com
Efficiency is intelligent laziness.