Hi,
I'm sorry my reply is too late.
Tue, 12 Apr 2005 10:38:50 +0100, Jonathan Paisley wrote:
>Hi,
>
>After following the instructions on the FAQ [1], with a few fiddles, I
>have got Cocoa bindings on a Ruby object to work well. Please let me
>know what you think of these modifications - if they seem ok I'll try
>to update the Wiki FAQ page.
>
>The main thing I wanted to support was notification from Ruby to Cocoa
>upon changing a value in Ruby.
>
>The kvc_accessor meta-method takes care of wrapping the setter (key=)
>with the Cocoa bindings notifications. If the setter is already
>defined, it will be wrapped by the kvc_accessor:
>
> class MyModel < OSX::NSObject
> def foo=(value)
> @foo = value
> @foo_parsed = ... # do some parsing of foo
> end
>
> kvc_accessor :foo # wraps foo= with notification, also defines foo
>reader method
> end
>
>Now, in other code, if you do 'model.foo = "Something"', any GUI
>objects bound will automatically update.
>
It's cool! If you allow, I will add kvc_accessor to RubyCocoa.
btw, Module#method_added enables to hook method definition. Following
code reverts a wrapper of a setter when the setter is overrided.
module NSBehaviorAttachment
def kvc_accessor(*keys)
# define setter if needed
# alias setter to internal setter
# define wrapper
# alias wrapper to setter
end
def kvc_internal_setter(key)
# returns wrapped setter name
end
def kvc_setter_wrapper(key)
# returns wrapper name
end
def method_added(sym)
return unless sym.to_s =~ /([^=]+)=\z/
key = $1
setter = kvc_internal_setter(key)
wrapper = kvc_setter_wrapper(key)
return unless method_defined?(setter) && method_defined?(wrapper)
# do not re-alias wrapper
return if self.instance_method(wrapper) == self.instance_method(sym)
# re-alias wrapper to setter
alias_method sym, wrapper
end
end
--
kimura wataru
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