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module Redcar
# Sensitive abstracts the concept of an object having an enabled/disabled
# property that is 'sensitive' to whether a number of other things
# are true. The "things that can be true" are Redcar::Sensitivitys,
# and the disabled, enabled property is only enabled when all the
# Sensitivitys are active.
#
# For instance, if :is_tuesday is the name of a
# Redcar::Sensitivity that is only active when it is Tuesday,
# you can make an object sensitive to whether it is Tuesday by including
# this module and sensitizing the instance.
#
# class MySensitiveClass
# include Redcar::Sensitive
# end
#
# obj = MySensitiveClass.new
# obj.sensitize :is_tuesday
# obj.active? # => true|false
module Sensitive
# Sensitize the object to a list of sensitivities. May be called with
# multiple sensitivities multiple times.
#
# obj.sensitize :is_tuesday, :raining
# obj.sensitize :month_has_y
#
# @param [Array<Symbol>] list of sensitivity_names
def sensitize(*sensitivity_names)
@sensitivity_names ||= []
@sensitivity_names += sensitivity_names
sensitivity_names.each do |sensitivity_name|
Sensitivity.add_listener(Sensitivity.event_name(sensitivity_name)) do
old_sensitivity = @current_sensitivity
@current_sensitivity = active?
if old_sensitivity != @current_sensitivity
active_changed(@current_sensitivity)
end
end
end
end
# @return [Array<Symbol>] list of senstivity names
def sensitivity_names
@sensitivity_names || []
end
# @return [Array<Sensitivity>] list of senstivities
def sensitivities
sensitivity_names.map {|n| Sensitivity.get(n) }.compact
end
# Whether all the sensitivities of this object are active.
def active?
sensitivities.all? {|s| s.active? }
end
end
end
Version data entries
79 entries across 79 versions & 2 rubygems