MotionModel Watchable

motion_model_watchable.rb

module MotionModel
  module Watchable
    def self.included(base)
      # uncomment if private class methods
      # base.extend(PrivateClassMethods)

      base.extend(PublicClassMethods)

      # base.instance_eval do
      # Any instance specific code
      # end
    end

    module PublicClassMethods
      def watch(&block)
        observer = BW::App.notification_center.observe 'MotionModelDataDidChangeNotification' do |notification|
          if notification.object.is_a?(self.ancestors[0])
            block.call notification
          end
        end
        observer
      end

      def stop_watching(observer)
        App.notification_center.unobserve observer
      end
    end
  end
end