Re: Bindings, Dicts and Cancel Window

FROM : Mike Abdullah
DATE : Sun Jul 23 18:59:42 2006

If it's preferences, then have a look at the setAppliesImmediately: 
and other methods of NSUserDefaultsController.

If on the other hand, you're not actually using the defaults, two 
suggestions:

   1.
Scrap the Cancel button and make the user's changes "live"

   2.
When you're editing the sheet, bind the controls to a temporary model 
object.  If the use clicks cancel, just discard this object, if not 
copy it's values to the central model object.

Mike.

On 23 Jul 2006, at 1:06PM, Trygve Inda wrote:

> I have a prefs-like window with all the control values attached to
> key/values in a dict through bindings. Works great.
>
> I need to be able to handle the situation where the user clicks 
> cancel, and
> since they are bindings there are updated on the fly as the user is 
> clicking
> so my thought is...
>
> Before showing the window, use CFPropertyListCreateDeepCopy to copy 
> the
> dict.
>
> Now, how do I insert it back in a KVO way - or does it need to be 
> KVO at
> all? Can I just replace the entire (newly modified) dictionary with 
> the old
> one, or do I need to step through each key and insert the old 
> values into
> the newly modified dict.
>
> I hope this is clear.
>
> Trygve
>
>
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