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require 'forwardable'
require 'ostruct'
module SimpleNavigation
# This class acts as an adapter to items that are not defined using the DSL
# in the config/navigation.rb, but directly provided inside the application.
# When defining the items that way, every item you provide needs to define
# the following methods:
#
# * <tt>key</tt>
# * <tt>name</tt>
# * <tt>url</tt>
#
# and optionally
#
# * <tt>options</tt>
# * <tt>items</tt> - if one of your items has a subnavigation it must respond
# to <tt>items</tt> providing the subnavigation.
#
# You can also specify your items as a list of hashes.
# The hashes will be converted to objects automatically.
# The hashes representing the items obviously must have the keys :key, :name
# and :url and optionally the keys :options and :items.
#
# See SimpleNavigation::ItemContainer#item for the purpose of these methods.
class ItemAdapter
extend Forwardable
def_delegators :item, :key, :name, :url
attr_reader :item
def initialize(item)
@item = item.is_a?(Hash) ? OpenStruct.new(item) : item
end
# Returns the options for this item. If the wrapped item does not implement
# an options method, an empty hash is returned.
def options
item.respond_to?(:options) ? item.options : {}
end
# Returns the items (subnavigation) for this item if it responds to :items
# and the items-collection is not empty. Returns nil otherwise.
def items
item.items if item.respond_to?(:items) && item.items && item.items.any?
end
# Converts this Item into a SimpleNavigation::Item
def to_simple_navigation_item(item_container)
SimpleNavigation::Item.new(item_container, key, name, url, options)
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems