lib/trestle/navigation.rb in trestle-0.8.6 vs lib/trestle/navigation.rb in trestle-0.8.7

@@ -5,16 +5,14 @@
     autoload :Block
     autoload :Item
     autoload :Group
     autoload :NullGroup, "trestle/navigation/group"
 
-    def initialize(blocks)
-      @blocks = blocks
-    end
+    attr_reader :items
 
-    def items
-      @blocks.map(&:items).flatten
+    def initialize(items)
+      @items = items
     end
 
     def by_group
       Hash[stable_sort(items.group_by(&:group)).map { |group, items| [group, stable_sort(items)] }]
     end
@@ -24,9 +22,17 @@
     end
 
     def first
       sorted = by_group.values
       sorted.first.first if sorted.any?
+    end
+
+    def visible(context)
+      self.class.new(items.select { |item| item.visible?(context) })
+    end
+
+    def self.build(blocks)
+      new(blocks.map(&:items).flatten)
     end
 
   private
     def stable_sort(items)
       items.sort_by.with_index { |item, i| [item, i] }