Module: Glimmer::SWT::ObservableArray
- Includes:
- Observable
- Defined in:
- lib/glimmer/swt/observable_array.rb
Overview
TODO prefix utility methods with double-underscore
Class Method Summary collapse
Instance Method Summary collapse
- #add_observer(observer, element_properties = nil) ⇒ Object
- #has_observer?(observer) ⇒ Boolean
- #notify_observers ⇒ Object
- #property_observer_list ⇒ Object
- #remove_observer(observer, element_properties = nil) ⇒ Object
- #unregister_dependent_observers(old_value) ⇒ Object
Class Method Details
.extend_object(array) ⇒ Object
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# File 'lib/glimmer/swt/observable_array.rb', line 44 def self.extend_object(array) array.instance_eval("alias __original_add <<") array.instance_eval <<-end_eval, __FILE__, __LINE__ def <<(value) self.__original_add(value) notify_observers end end_eval array.instance_eval("alias __original_set_value []=") array.instance_eval <<-end_eval, __FILE__, __LINE__ def []=(index, value) old_value = self[index] unregister_dependent_observers(old_value) self.__original_set_value(index, value) notify_observers end end_eval array.instance_eval("alias __original_delete delete") array.instance_eval <<-end_eval, __FILE__, __LINE__ def delete(value) unregister_dependent_observers(value) self.__original_delete(value) notify_observers end end_eval array.instance_eval("alias __original_delete_at delete_at") array.instance_eval <<-end_eval, __FILE__, __LINE__ def delete_at(index) old_value = self[index] unregister_dependent_observers(old_value) self.__original_delete_at(index) notify_observers end end_eval array.instance_eval("alias __original_clear clear") array.instance_eval <<-end_eval, __FILE__, __LINE__ def clear each do |old_value| unregister_dependent_observers(old_value) end self.__original_clear notify_observers end end_eval super end |
Instance Method Details
#add_observer(observer, element_properties = nil) ⇒ Object
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# File 'lib/glimmer/swt/observable_array.rb', line 11 def add_observer(observer, element_properties=nil) return observer if has_observer?(observer) && element_properties.nil? property_observer_list << observer [element_properties].flatten.compact.each do |property| each do |element| observer.observe(element, property) end end observer end |
#has_observer?(observer) ⇒ Boolean
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# File 'lib/glimmer/swt/observable_array.rb', line 32 def has_observer?(observer) property_observer_list.include?(observer) end |
#notify_observers ⇒ Object
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# File 'lib/glimmer/swt/observable_array.rb', line 40 def notify_observers property_observer_list.each {|observer| observer.call} end |
#property_observer_list ⇒ Object
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# File 'lib/glimmer/swt/observable_array.rb', line 36 def property_observer_list @property_observer_list ||= Set.new end |
#remove_observer(observer, element_properties = nil) ⇒ Object
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# File 'lib/glimmer/swt/observable_array.rb', line 22 def remove_observer(observer, element_properties=nil) property_observer_list.delete(observer) [element_properties].flatten.compact.each do |property| each do |element| observer.unobserve(element, property) end end observer end |
#unregister_dependent_observers(old_value) ⇒ Object
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# File 'lib/glimmer/swt/observable_array.rb', line 96 def unregister_dependent_observers(old_value) # TODO look into optimizing this return unless old_value.is_a?(ObservableModel) || old_value.is_a?(ObservableArray) property_observer_list.each do |observer| observer.unregister_dependents_with_observable([self, nil], old_value) end end |