[MacRuby-devel] Using mixico to streamline HotCocoa?

Ernest N. Prabhakar, Ph.D. prabhaka at apple.com
Tue Oct 7 13:13:01 PDT 2008

Hi all,

One of the more clunky aspects of Hot Cocoa is the need to repeatedly  
state the object being manipulated, e.g.:

slider :frame => [100, 150, 200, 24] do |s|
   s.min = 0
   s.max = 100
   s.on_action do |sender|
     puts "Changed to #{sender.doubleValue}!"
While I appreciate the resulting precision, the repetition feels a bit  
Python-esque to me. :-)
My impression was that part of the reason for this was to preserve  
"self" instead of using instance_eval, whic h is understandable.   
However, _why has come up with a C extension called "mixico" that  
provides similar functionalityh via mixins, without changing self:
> http://hackety.org/2008/10/06/mixingOurWayOutOfInstanceEval.html

  class Module
    def mix_eval mod, &blk
      blk.mixin mod
      blk.mixout mod

> http://github.com/why/mixico/tree/master/README

What do you think? Is this a viable option for HotCocoa, or are there  
other issues I'm overlooking?

-- Ernie P.

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