engine/app/cells/locomotive/menu_cell.rb

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class Locomotive::MenuCell < Cell::Base
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include ::Locomotive::Engine.routes.url_helpers
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delegate :sections, :to => :parent_controller
attr_accessor :list
def initialize(*args)
super
self.list = []
end
def show(args = {})
self.build_list
render
end
def url_options
super.reverse_merge(
:host => request.host_with_port,
:protocol => request.protocol,
:_path_segments => request.symbolized_path_parameters
).merge(:script_name => request.script_name)
end
class MenuProxy
def initialize(cell)
@cell = cell
end
def method_missing(meth, *args)
@cell.send(meth, *args)
end
end
def self.update_for(name, &block)
method_name = "build_list_with_#{name}".to_sym
previous_method_name = "build_list_without_#{name}".to_sym
unless self.instance_methods.include?(method_name) # prevents the method to be called twice which will raise a "stack level too deep" exception
self.send(:define_method, method_name) do
self.send(previous_method_name)
block.call(MenuProxy.new(self))
end
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# Note: this might cause "stack level too deep" if called twice for the same name
alias_method_chain :build_list, name.to_sym
end
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end
protected
def build_list
raise 'the build_list method must be overridden'
end
def build_item(name, attributes)
unless attributes.key?(:label)
attributes[:label] = localize_label(name)
end
attributes.merge!(:name => name, :class => name.to_s.dasherize.downcase)
end
def add(name, attributes)
self.list << build_item(name, attributes)
end
def add_after(pivot, name, attributes)
index = self.list.index { |i| i[:name] == pivot }
self.list.insert(index + 1, self.build_item(name, attributes))
end
def add_before(pivot, name, attributes)
index = self.list.index { |i| i[:name] == pivot }
self.list.insert(index, self.build_item(name, attributes))
end
def modify(name, attributes)
self.find(name).merge!(attributes)
end
def remove(name)
self.list.delete_if { |i| i[:name] == name }
end
def find(name)
self.list.detect { |i| i[:name] == name }
end
def localize_label(label)
I18n.t("locomotive.shared.menu.#{label}")
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end
end