Class: SknUtils::NotifierBase

Inherits:
Object
  • Object
show all
Defined in:
lib/skn_utils/notifier_base.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ NotifierBase

Returns a new instance of NotifierBase.



10
11
12
 
# File 'lib/skn_utils/notifier_base.rb', line 10

def initialize
  @listeners = []
end

Class Method Details

.attribute(*attrs) ⇒ Object

create writer-with-notify and reader



23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
 
# File 'lib/skn_utils/notifier_base.rb', line 23

def self.attribute(*attrs)
  attrs.each do |attr|
    instance_variable_set("@#{attr}", nil)
    define_method(attr) do
      instance_variable_get("@#{attr}")
    end
    define_method("#{attr}=") do |value|
      old_value = instance_variable_get("@#{attr}")
      return if (value == old_value)
      instance_variable_set("@#{attr}", value)
      @listeners.each do |listener|
        listener.attribute_changed(attr, old_value, value)
      end
    end
  end # loop on attrs
end

Instance Method Details

#register_listener(listener) ⇒ Object 



14
15
16
 
# File 'lib/skn_utils/notifier_base.rb', line 14

def register_listener(listener)
  @listeners.push(listener) unless @listeners.include?(listener)
end

#unregister_listener(listener) ⇒ Object 



18
19
20
 
# File 'lib/skn_utils/notifier_base.rb', line 18

def unregister_listener(listener)
  @listeners.delete(listener)
end