Class: Pdfrb::Document::OutlineEntry

Inherits:
Object
  • Object
show all
Defined in:
lib/pdfrb/document/outline.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(title:, dest:) ⇒ OutlineEntry

Returns a new instance of OutlineEntry.



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# File 'lib/pdfrb/document/outline.rb', line 61

def initialize(title:, dest:)
  @title = title
  @dest = dest
  @children = []
end

Instance Attribute Details

#children ⇒ Object (readonly)

Returns the value of attribute children.



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# File 'lib/pdfrb/document/outline.rb', line 59

def children
  @children
end

#dest ⇒ Object (readonly)

Returns the value of attribute dest.



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# File 'lib/pdfrb/document/outline.rb', line 59

def dest
  @dest
end

#title ⇒ Object (readonly)

Returns the value of attribute title.



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# File 'lib/pdfrb/document/outline.rb', line 59

def title
  @title
end

Instance Method Details

#add_child(entry) ⇒ Object 



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# File 'lib/pdfrb/document/outline.rb', line 67

def add_child(entry)
  @children << entry
  entry
end

#build!(document) ⇒ Object 



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# File 'lib/pdfrb/document/outline.rb', line 72

def build!(document)
  dict = document.add({ Title: @title }, type: Pdfrb::Model::Cos::Dictionary)
  dict.value[:Dest] = @dest if @dest

  if @children.any?
    prev_child_dict = nil
    first_ref = nil
    @children.each do |child|
      child_dict = child.build!(document)
      child_ref = Pdfrb::Model::Reference.new(child_dict.oid, child_dict.gen)
      parent_ref = Pdfrb::Model::Reference.new(dict.oid, dict.gen)

      child_dict.value[:Parent] = parent_ref
      child_dict.value[:Prev] = Pdfrb::Model::Reference.new(prev_child_dict.oid, prev_child_dict.gen) if prev_child_dict
      child_dict.value[:Next] = nil
      prev_child_dict&.value&.[]=(:Next, child_ref)

      first_ref ||= child_ref
      prev_child_dict = child_dict
    end

    dict.value[:First] = first_ref
    dict.value[:Last] = Pdfrb::Model::Reference.new(prev_child_dict.oid, prev_child_dict.gen) if prev_child_dict
    dict.value[:Count] = @children.length
  end

  dict
end