Class: Prawn::Table::Cell::AsciiDoc

Inherits:
Prawn::Table::Cell show all
Includes:
Asciidoctor::Logging
Defined in:
lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(pdf, opts = {}) ⇒ AsciiDoc

Returns a new instance of AsciiDoc.



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# File 'lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb', line 13

def initialize pdf, opts = {}
  @font_options = {}
  @align = @valign = @root_font_size = nil
  super pdf, [], opts
end

Instance Attribute Details

#align ⇒ Object

Returns the value of attribute align.



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# File 'lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb', line 9

def align
  @align
end

#root_font_size ⇒ Object

Returns the value of attribute root_font_size.



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# File 'lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb', line 10

def root_font_size
  @root_font_size
end

#valign ⇒ Object

Returns the value of attribute valign.



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# File 'lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb', line 11

def valign
  @valign
end

Instance Method Details

#draw_content ⇒ Object

NOTE: prawn-table doesn’t support cells that exceed the height of a single page



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# File 'lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb', line 69

def draw_content
  if (pdf = @pdf).scratch?
    pdf.move_down natural_content_height
    return
  end
  # NOTE: draw_bounded_content automatically adds FPTolerance to width and height
  pdf.bounds.instance_variable_set :@width, spanned_content_width
  padding_adjustment = content.context == :document ? padding_bottom : 0
  # NOTE: we've already reserved the space, so just let the box stretch to bottom of the content area
  pdf.bounds.instance_variable_set :@height, (pdf.y - pdf.page.margins[:bottom] - padding_adjustment)
  if @valign != :top && (excess_y = spanned_content_height - natural_content_height) > 0
    # QUESTION: could this cause a unexpected page overrun?
    pdf.move_down(@valign == :center ? (excess_y.fdiv 2) : excess_y)
  end
  # # use perform_on_single_page to prevent content from being written on extra pages
  # # the problem with this approach is that we don't know whether any content is written to next page
  # apply_font_properties do
  #   if (pdf.perform_on_single_page { pdf.traverse content })
  #     logger.error %(the table cell on page #{pdf.page_number} has been truncated; Asciidoctor PDF does not support table cell content that exceeds the height of a single page)
  #   end
  # end
  start_page = pdf.page_number
  parent_doc = (doc = content.document).nested? ? doc.parent_document : doc
  doc.catalog[:footnotes] = parent_doc.catalog[:footnotes]
  # TODO: apply horizontal alignment; currently it is necessary to specify alignment on content blocks
  apply_font_properties { pdf.traverse content }
  if (extra_pages = pdf.page_number - start_page) > 0
    unless extra_pages == 1 && pdf.page.empty?
      logger.error message_with_context %(the table cell on page #{start_page} has been truncated; Asciidoctor PDF does not support table cell content that exceeds the height of a single page), source_location: @source_location
    end
    extra_pages.times { pdf.delete_current_page }
  end
  nil
end

#dry_run ⇒ Object

NOTE: automatic image sizing only works if cell has fixed width



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# File 'lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb', line 36

def dry_run
  cell = self
  parent_doc = (doc = content.document).nested? ? doc.parent_document : doc
  padding_y = cell.padding_top + cell.padding_bottom
  max_height = @pdf.bounds.height
  extent = nil
  apply_font_properties do
    extent = @pdf.dry_run keep_together: true, single_page: true do
      push_scratch parent_doc
      # NOTE: we should be able to use cell.max_width, but returns 0 in some conditions (like when colspan > 1)
      indent cell.padding_left, bounds.width - cell.width + cell.padding_right do
        move_down padding_y if padding_y > 0
        conceal_page_top { traverse cell.content }
      end
      pop_scratch parent_doc
    end
  end
  # NOTE: prawn-table doesn't support cells that exceed the height of a single page
  # NOTE: height does not include top/bottom padding, but must account for it when checking for overrun
  (extent.single_page_height || max_height) - padding_y
end

#font=(val) ⇒ Object 



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# File 'lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb', line 31

def font= val
  @font_options[:family] = val
end

#font_style=(val) ⇒ Object 



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# File 'lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb', line 19

def font_style= val
  @font_options[:style] = val
end

#natural_content_height ⇒ Object 



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# File 'lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb', line 63

def natural_content_height
  # NOTE: when natural_content_height is called, we already know max width
  @natural_content_height ||= dry_run
end

#natural_content_width ⇒ Object 



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# File 'lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb', line 58

def natural_content_width
  # QUESTION: can we get a better estimate of the natural width?
  @natural_content_width ||= (@pdf.bounds.width - padding_left - padding_right)
end

#size=(val) ⇒ Object 



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# File 'lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb', line 27

def size= val
  @font_options[:size] = val
end

#text_color=(val) ⇒ Object 



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# File 'lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb', line 23

def text_color= val
  @font_options[:color] = val
end