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.



13
14
15
16
17
# 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

#alignObject

Returns the value of attribute align.



9
10
11
# File 'lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb', line 9

def align
  @align
end

#root_font_sizeObject

Returns the value of attribute root_font_size.



10
11
12
# File 'lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb', line 10

def root_font_size
  @root_font_size
end

#valignObject

Returns the value of attribute valign.



11
12
13
# File 'lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb', line 11

def valign
  @valign
end

Instance Method Details

#draw_contentObject

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



69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
# 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_runObject

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



36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
# 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



31
32
33
# File 'lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb', line 31

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

#font_style=(val) ⇒ Object



19
20
21
# File 'lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb', line 19

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

#natural_content_heightObject



63
64
65
66
# 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_widthObject



58
59
60
61
# 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



27
28
29
# File 'lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb', line 27

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

#text_color=(val) ⇒ Object



23
24
25
# File 'lib/asciidoctor/pdf/ext/prawn-table/cell/asciidoc.rb', line 23

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