37 lines
795 B
Ruby
37 lines
795 B
Ruby
# frozen_string_literal: true
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# This module handles elements in a list. All elements
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# must have a different class
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module Sidebars
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module PositionableList
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def add_element(list, element)
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list << element
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end
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def insert_element_before(list, before_element, new_element)
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index = index_of(list, before_element)
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if index
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list.insert(index, new_element)
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else
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list.unshift(new_element)
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end
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end
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def insert_element_after(list, after_element, new_element)
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index = index_of(list, after_element)
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if index
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list.insert(index + 1, new_element)
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else
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add_element(list, new_element)
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end
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end
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private
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def index_of(list, element)
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list.index { |e| e.is_a?(element) }
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end
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end
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end
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