Module: ObservableArray

Defined in:
lib/command_handlers/models/observable_array.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.extend_object(array) ⇒ Object 



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# File 'lib/command_handlers/models/observable_array.rb', line 23

def self.extend_object(array)
  array.instance_eval("alias original_add <<")
  array.instance_eval "    def <<(value)\n      self.original_add(value)\n      notify_observers\n    end\n  end_eval\n\n  notify_observers_on_invokation(array, \"delete\", 1)\n  notify_observers_on_invokation(array, \"delete_at\", 1)\n  notify_observers_on_invokation(array, \"clear\")\n\n  super\nend\n", __FILE__, __LINE__

.notify_observers_on_invokation(model, method, argument_count = 0) ⇒ Object 



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# File 'lib/command_handlers/models/observable_array.rb', line 39

def self.notify_observers_on_invokation(model, method, argument_count=0)
  model.instance_eval "alias original_#{method} #{method}\n"
  arguments = ""
  for index in 1..argument_count
    arguments += "argument" + index.to_s + ","
  end
  arguments = arguments[0..-2]
  model.instance_eval "    def \#{method}(\#{arguments})\n      self.original_\#{method}(\#{arguments})\n      notify_observers\n    end\n  end_eval\nend\n", __FILE__, __LINE__

Instance Method Details

#add_observer(element_properties, observer) ⇒ Object 



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# File 'lib/command_handlers/models/observable_array.rb', line 4

def add_observer(element_properties, observer)
  property_observer_list << observer
  each do |element|
    [element_properties].flatten.each do |property|
      element.extend(ObservableModel) unless element.is_a?(ObservableModel)
      element.add_observer(property, observer)
    end
  end
end

#notify_observers ⇒ Object 



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# File 'lib/command_handlers/models/observable_array.rb', line 19

def notify_observers
  property_observer_list.each {|observer| observer.update}
end

#property_observer_list ⇒ Object 



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# File 'lib/command_handlers/models/observable_array.rb', line 14

def property_observer_list
  @property_observer_list = Set.new unless @property_observer_list
  @property_observer_list
end