Class: Mill::Navigator

Inherits:
Object
  • Object
show all
Defined in:
lib/mill/navigator.rb

Defined Under Namespace

Classes: Item

Instance Method Summary collapse

Constructor Details

#initialize(items: []) ⇒ Navigator

Returns a new instance of Navigator.



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# File 'lib/mill/navigator.rb', line 17

def initialize(items: [])
  @items = Hash[
    items.map do |uri, title|
      item = Item.new(uri: uri, title: title)
      [item.uri, item]
    end
  ]
end

Instance Method Details

#first_item ⇒ Object 



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# File 'lib/mill/navigator.rb', line 30

def first_item
  @items.values.first
end

#items ⇒ Object 



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# File 'lib/mill/navigator.rb', line 26

def items
  @items.values
end

#last_item ⇒ Object 



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# File 'lib/mill/navigator.rb', line 34

def last_item
  @items.values.last
end

#next_item(uri) ⇒ Object 



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# File 'lib/mill/navigator.rb', line 48

def next_item(uri)
  if (item = @items[uri])
    i = @items.values.index(item)
    if i < @items.length - 1
      return @items.values[i + 1]
    end
  end
  nil
end

#previous_item(uri) ⇒ Object 



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# File 'lib/mill/navigator.rb', line 38

def previous_item(uri)
  if (item = @items[uri])
    i = @items.values.index(item)
    if i > 0
      return @items.values[i - 1]
    end
  end
  nil
end