[MacRuby-devel] Key-value observing

[Thilo]

Isn't it already working? At least for primitiv types?

Eg. when I bind a label to a Int property which i change with a slider 
bind to the same property i don't need additional code for KVO.

Cheers
Thilo


On 13.05.2009 22:31 Uhr, Jeremy Voorhis wrote:
> I've created a ticket at https://www.macruby.org/trac/ticket/252. I
> might be wrong as I am still grokking the Objective-C runtime, but it
> seems to me that this should be easy to implement if attr_accessor and
> attr_writer generate the setKey: method first and then implement #key=
> in terms of setKey:. Is there some requirement that key-value setter
> methods return void, or is that just by convention?
>
> Best,
>
> Jeremy
>
> On Wed, May 13, 2009 at 12:00 PM, Laurent Sansonetti
> <lsansonetti at apple.com>  wrote:
>> Hi Jeremy,
>>
>> That's a pretty good idea! Could you file a bug on the tracker so that we do
>> not forget about it?
>>
>> Thanks,
>> Laurent
>>
>> On May 12, 2009, at 10:18 AM, Jeremy Voorhis wrote:
>>
>>> Hello,
>>>
>>> I've been learning Cocoa, Objective-C and macruby in tandem and I was
>>> just wondering, are there any plans to integrate the key-value
>>> observing protocol with the attr_accessor family of methods? With a
>>> little experimentation, I found KVO is definitely possible with
>>> macruby, but the syntax is less than ideal (transcript made with the
>>> 0.4 release).
>>>
>>> ~ % macirb
>>>>> class Notifier
>>>>>   attr_accessor :value
>>>>> end
>>> =>  nil
>>>>> class Observer
>>>>>   def observeValueForKeyPath(path, ofObject:object, change:change,
>>>>> context:context) puts change end
>>>>> end
>>> =>  nil
>>>>> n = Notifier.new
>>> =>  #<Notifier:0x8005e91a0>
>>>>> n.addObserver(Observer.new, forKeyPath:'value', options:0, context:nil)
>>> =>  nil
>>>>> n.value = 42
>>> =>  42
>>>>> n.setValue 42
>>> {"kind"=>1}
>>> =>  nil
>>>
>>> Best,
>>>
>>> Jeremy Voorhis
>>> _______________________________________________
>>> MacRuby-devel mailing list
>>> MacRuby-devel at lists.macosforge.org
>>> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
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