Class: Prawn::Table::Cell

Inherits:
Object
  • Object
show all
Defined in:
lib/prawn/table/cell.rb,
lib/prawn/table/cell/text.rb,
lib/prawn/table/cell/image.rb,
lib/prawn/table/cell/in_table.rb,
lib/prawn/table/cell/subtable.rb,
lib/prawn/table/cell/span_dummy.rb

Overview

A Cell is a rectangular area of the page into which content is drawn. It has a framework for sizing itself and adding padding and simple styling. There are several standard Cell subclasses that handle things like text, Tables, and (in the future) stamps, images, and arbitrary content.

Cells are a basic building block for table support (see Prawn::Table).

Please subclass me if you want new content types! I’m designed to be very extensible. See the different standard Cell subclasses in lib/prawn/table/cell/*.rb for a template.

Experimental API collapse

FPTolerance =

A small amount added to the bounding box width to cover over floating- point errors when round-tripping from content_width to width and back. This does not change cell positioning; it only slightly expands each cell’s bounding box width so that rounding error does not prevent a cell from rendering.

1

Experimental API collapse

Experimental API collapse

Constructor Details

#initialize(pdf, point, options = {}) ⇒ Cell

Sets up a cell on the document pdf, at the given x/y location point, with the given options. Cell, like Table, follows the “options set accessors” paradigm (see “Options” under the Table documentation), so any cell accessor cell.foo = :bar can be set by providing the option :foo => :bar here.



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# File 'lib/prawn/table/cell.rb', line 208

def initialize(pdf, point, options={})
  @pdf   = pdf
  @point = point

  # Set defaults; these can be changed by options
  @padding       = [5, 5, 5, 5]
  @borders       = [:top, :bottom, :left, :right]
  @border_widths = [1] * 4
  @border_colors = ['000000'] * 4
  @border_lines  = [:solid] * 4
  @colspan = 1
  @rowspan = 1
  @dummy_cells = []

  options.each { |k, v| send("#{k}=", v) }

  @initializer_run = true
end

Instance Attribute Details

#background_color ⇒ Object

The background color, if any, for this cell. Specified in HTML RGB format, e.g., “ccffff”. The background is drawn under the whole cell, including any padding.



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# File 'lib/prawn/table/cell.rb', line 142

def background_color
  @background_color
end

#border_colors ⇒ Object (readonly)

HTML RGB-format (“ccffff”) border colors: [top, right, bottom, left].



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# File 'lib/prawn/table/cell.rb', line 126

def border_colors
  @border_colors
end

#border_lines ⇒ Object (readonly)

Line style



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# File 'lib/prawn/table/cell.rb', line 130

def border_lines
  @border_lines
end

#border_widths ⇒ Object (readonly)

Width, in PDF points, of the cell’s borders: [top, right, bottom, left].



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# File 'lib/prawn/table/cell.rb', line 122

def border_widths
  @border_widths
end

#borders ⇒ Object

Specifies which borders to enable. Must be an array of zero or more of: [:left, :right, :top, :bottom].



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# File 'lib/prawn/table/cell.rb', line 118

def borders
  @borders
end

#colspan ⇒ Object

Number of columns this cell spans. Defaults to 1.



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# File 'lib/prawn/table/cell.rb', line 146

def colspan
  @colspan
end

#content ⇒ Object

Specifies the content for the cell. Must be a “cellable” object. See the “Data” section of the Prawn::Table documentation for details on cellable objects.



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# File 'lib/prawn/table/cell.rb', line 136

def content
  @content
end

#dummy_cells ⇒ Object (readonly)

Array of SpanDummy cells (if any) that represent the other cells in this span group. They know their own width / height, but do not draw anything.



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# File 'lib/prawn/table/cell.rb', line 156

def dummy_cells
  @dummy_cells
end

#height ⇒ Object

Returns the cell’s height in points, inclusive of padding. If the cell is the master cell of a rowspan, returns the width of the entire span group.



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# File 'lib/prawn/table/cell.rb', line 316

def height
  return height_ignoring_span if @colspan == 1 && @rowspan == 1

  # We're in a span group; get the maximum height per row (including the
  # master cell) and sum each row.
  row_heights = Hash.new(0)
  dummy_cells.each do |cell|
    row_heights[cell.row] = [row_heights[cell.row], cell.height].max
  end
  row_heights[row] = [row_heights[row], height_ignoring_span].max
  row_heights.values.inject(0, &:+)
end

#padding ⇒ Object

Amount of dead space (in PDF points) inside the borders but outside the content. Padding defaults to 5pt.



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# File 'lib/prawn/table/cell.rb', line 57

def padding
  @padding
end

#rowspan ⇒ Object

Number of rows this cell spans. Defaults to 1.



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# File 'lib/prawn/table/cell.rb', line 150

def rowspan
  @rowspan
end

Class Method Details

.draw_cells(cells) ⇒ Object

Given an array of pairs [cell, pt], draws each cell at its corresponding pt, making sure all backgrounds are behind all borders and content.



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# File 'lib/prawn/table/cell.rb', line 411

def self.draw_cells(cells)
  cells.each do |cell, pt|
    cell.set_width_constraints
    cell.draw_background(pt)
  end

  cells.each do |cell, pt|
    cell.draw_borders(pt)
    cell.draw_bounded_content(pt)
  end
end

.make(pdf, content, options = {}) ⇒ Object

Instantiates a Cell based on the given options. The particular class of cell returned depends on the :content argument. See the Prawn::Table documentation under “Data” for allowable content types.



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# File 'lib/prawn/table/cell.rb', line 162

def self.make(pdf, content, options={})
  at = options.delete(:at) || [0, pdf.cursor]
  content = content.to_s if content.nil? || content.kind_of?(Numeric) ||
    content.kind_of?(Date)

  if content.is_a?(Hash)
    if content[:image]
      return Cell::Image.new(pdf, at, content)
    end
    options.update(content)
    content = options[:content]
  else
    options[:content] = content
  end

  options[:content] = content = "" if content.nil?

  case content
  when Prawn::Table::Cell
    content
  when String
    Cell::Text.new(pdf, at, options)
  when Prawn::Table
    Cell::Subtable.new(pdf, at, options)
  when Array
    subtable = Prawn::Table.new(options[:content], pdf, {})
    Cell::Subtable.new(pdf, at, options.merge(:content => subtable))
  else
    raise Errors::UnrecognizedTableContent
  end
end

Instance Method Details

#avg_spanned_min_width ⇒ Object

Min-width of the span divided by the number of columns.



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# File 'lib/prawn/table/cell.rb', line 83

def avg_spanned_min_width
  min_width.to_f / colspan
end

#border_bottom_color ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 558

def border_bottom_color
  @border_colors[2]
end

#border_bottom_color=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 562

def border_bottom_color=(val)
  @border_colors[2] = val
end

#border_bottom_line ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 684

def border_bottom_line
  @borders.include?(:bottom) ? @border_lines[2] : 0
end

#border_bottom_line=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 688

def border_bottom_line=(val)
  @border_lines[2] = val
end

#border_bottom_width ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 616

def border_bottom_width
  @borders.include?(:bottom) ? @border_widths[2] : 0
end

#border_bottom_width=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 620

def border_bottom_width=(val)
  @border_widths[2] = val
end

#border_color=(color) ⇒ Object Also known as: border_colors=

Sets border colors on this cell. The argument can be one of:

  • an integer (sets all colors)

  • a two-element array [vertical, horizontal]

  • a three-element array [top, horizontal, bottom]

  • a four-element array [top, right, bottom, left]



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# File 'lib/prawn/table/cell.rb', line 523

def border_color=(color)
  @border_colors = case
  when color.nil?
    ["000000"] * 4
  when String === color # all colors
    [color, color, color, color]
  when color.length == 2 # vert, horiz
    [color[0], color[1], color[0], color[1]]
  when color.length == 3 # top, horiz, bottom
    [color[0], color[1], color[2], color[1]]
  when color.length == 4 # top, right, bottom, left
    [color[0], color[1], color[2], color[3]]
  else
    raise ArgumentError, ":border_color must be a string " +
      "or an array [v,h] or [t,r,b,l]"
  end
end

#border_left_color ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 566

def border_left_color
  @border_colors[3]
end

#border_left_color=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 570

def border_left_color=(val)
  @border_colors[3] = val
end

#border_left_line ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 692

def border_left_line
  @borders.include?(:left) ? @border_lines[3] : 0
end

#border_left_line=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 696

def border_left_line=(val)
  @border_lines[3] = val
end

#border_left_width ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 624

def border_left_width
  @borders.include?(:left) ? @border_widths[3] : 0
end

#border_left_width=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 628

def border_left_width=(val)
  @border_widths[3] = val
end

#border_line=(line) ⇒ Object Also known as: border_lines=

Sets border line style on this cell. The argument can be one of:

Possible values are: :solid, :dashed, :dotted

  • one value (sets all lines)

  • a two-element array [vertical, horizontal]

  • a three-element array [top, horizontal, bottom]

  • a four-element array [top, right, bottom, left]



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# File 'lib/prawn/table/cell.rb', line 649

def border_line=(line)
  @border_lines = case
  when line.nil?
    [:solid] * 4
  when line.length == 1 # all lines
    [line[0]] * 4
  when line.length == 2
    [line[0], line[1], line[0], line[1]]
  when line.length == 3
    [line[0], line[1], line[2], line[1]]
  when line.length == 4
    [line[0], line[1], line[2], line[3]]
  else
    raise ArgumentError, "border_line must be one of :solid, :dashed, "
      ":dotted or an array [v,h] or [t,r,b,l]"
  end
end

#border_right_color ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 550

def border_right_color
  @border_colors[1]
end

#border_right_color=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 554

def border_right_color=(val)
  @border_colors[1] = val
end

#border_right_line ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 676

def border_right_line
  @borders.include?(:right) ? @border_lines[1] : 0
end

#border_right_line=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 680

def border_right_line=(val)
  @border_lines[1] = val
end

#border_right_width ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 608

def border_right_width
  @borders.include?(:right) ? @border_widths[1] : 0
end

#border_right_width=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 612

def border_right_width=(val)
  @border_widths[1] = val
end

#border_top_color ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 542

def border_top_color
  @border_colors[0]
end

#border_top_color=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 546

def border_top_color=(val)
  @border_colors[0] = val
end

#border_top_line ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 668

def border_top_line
  @borders.include?(:top) ? @border_lines[0] : 0
end

#border_top_line=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 672

def border_top_line=(val)
  @border_lines[0] = val
end

#border_top_width ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 600

def border_top_width
  @borders.include?(:top) ? @border_widths[0] : 0
end

#border_top_width=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 604

def border_top_width=(val)
  @border_widths[0] = val
end

#border_width=(width) ⇒ Object Also known as: border_widths=

Sets border widths on this cell. The argument can be one of:

  • an integer (sets all widths)

  • a two-element array [vertical, horizontal]

  • a three-element array [top, horizontal, bottom]

  • a four-element array [top, right, bottom, left]



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# File 'lib/prawn/table/cell.rb', line 581

def border_width=(width)
  @border_widths = case
  when width.nil?
    ["000000"] * 4
  when Numeric === width # all widths
    [width, width, width, width]
  when width.length == 2 # vert, horiz
    [width[0], width[1], width[0], width[1]]
  when width.length == 3 # top, horiz, bottom
    [width[0], width[1], width[2], width[1]]
  when width.length == 4 # top, right, bottom, left
    [width[0], width[1], width[2], width[3]]
  else
    raise ArgumentError, ":border_width must be a string " +
      "or an array [v,h] or [t,r,b,l]"
  end
end

#content_height ⇒ Object

Returns the height of the bare content in the cell, excluding padding.



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# File 'lib/prawn/table/cell.rb', line 331

def content_height
  if defined?(@height) && @height # manually set
    return @height - padding_top - padding_bottom
  end

  natural_content_height
end

#content_width ⇒ Object

Returns the width of the bare content in the cell, excluding padding.



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# File 'lib/prawn/table/cell.rb', line 281

def content_width
  if defined?(@width) && @width # manually set
    return @width - padding_left - padding_right
  end

  natural_content_width
end

#draw(pt = [x, y]) ⇒ Object

Draws the cell onto the document. Pass in a point [x,y] to override the location at which the cell is drawn.

If drawing a group of cells at known positions, look into Cell.draw_cells, which ensures that the backgrounds, borders, and content are all drawn in correct order so as not to overlap.



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# File 'lib/prawn/table/cell.rb', line 403

def draw(pt=[x, y])
  Prawn::Table::Cell.draw_cells([[self, pt]])
end

#draw_background(pt) ⇒ Object

Draws the cell’s background color.



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# File 'lib/prawn/table/cell.rb', line 702

def draw_background(pt)
  if defined?(@background_color) && @background_color
    @pdf.mask(:fill_color) do
      @pdf.fill_color @background_color
      @pdf.fill_rectangle pt, width, height
    end
  end
end

#draw_borders(pt) ⇒ Object

Draws borders around the cell. Borders are centered on the bounds of the cell outside of any padding, so the caller is responsible for setting appropriate padding to ensure the border does not overlap with cell content.



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# File 'lib/prawn/table/cell.rb', line 716

def draw_borders(pt)
  x, y = pt

  @pdf.mask(:line_width, :stroke_color) do
    @borders.each do |border|
      idx = {:top => 0, :right => 1, :bottom => 2, :left => 3}[border]
      border_color = @border_colors[idx]
      border_width = @border_widths[idx]
      border_line  = @border_lines[idx]

      next if border_width <= 0

      # Left and right borders are drawn one-half border beyond the center
      # of the corner, so that the corners end up square.
      from, to = case border
                 when :top
                   [[x, y], [x+width, y]]
                 when :bottom
                   [[x, y-height], [x+width, y-height]]
                 when :left
                   [[x, y + (border_top_width / 2.0)],
                    [x, y - height - (border_bottom_width / 2.0)]]
                 when :right
                   [[x+width, y + (border_top_width / 2.0)],
                    [x+width, y - height - (border_bottom_width / 2.0)]]
                 end

      case border_line
      when :dashed
        @pdf.dash border_width * 4
      when :dotted
        @pdf.dash border_width, :space => border_width * 2
      when :solid
        # normal line style
      else
        raise ArgumentError, "border_line must be :solid, :dotted or" +
          " :dashed"
      end

      @pdf.line_width   = border_width
      @pdf.stroke_color = border_color
      @pdf.stroke_line(from, to)
      @pdf.undash
    end
  end
end

#draw_bounded_content(pt) ⇒ Object

Draws the cell’s content at the point provided.



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# File 'lib/prawn/table/cell.rb', line 425

def draw_bounded_content(pt)
  @pdf.float do
    @pdf.bounding_box([pt[0] + padding_left, pt[1] - padding_top],
                      :width  => spanned_content_width + FPTolerance,
                      :height => spanned_content_height + FPTolerance) do
      draw_content
    end
  end
end

#draw_content ⇒ Object

Draws cell content within the cell’s bounding box. Must be implemented in subclasses.

Raises:

  • (NotImplementedError) 


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# File 'lib/prawn/table/cell.rb', line 766

def draw_content
  raise NotImplementedError, "subclasses must implement draw_content"
end

#height_ignoring_span ⇒ Object

Returns the cell’s height in points, inclusive of padding, in its first row only.



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# File 'lib/prawn/table/cell.rb', line 306

def height_ignoring_span
  # We can't ||= here because the FP error accumulates on the round-trip
  # from #content_height.
  defined?(@height) && @height || (content_height + padding_top + padding_bottom)
end

#max_width ⇒ Object

Maximum width of the entire span group this cell controls.



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# File 'lib/prawn/table/cell.rb', line 97

def max_width
  return max_width_ignoring_span if @colspan == 1

  # Sum the smallest max-width from each column in the group, including
  # myself.
  max_widths = Hash.new(0)
  dummy_cells.each do |cell|
    max_widths[cell.column] =
      [max_widths[cell.column], cell.max_width].min
  end
  max_widths[column] = [max_widths[column], max_width_ignoring_span].min
  max_widths.values.inject(0, &:+)
end

#max_width_ignoring_span ⇒ Object

If provided, the maximum width that this cell can be drawn in, within its column.



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# File 'lib/prawn/table/cell.rb', line 90

def max_width_ignoring_span
  set_width_constraints
  @max_width
end

#min_width ⇒ Object

Minimum width of the entire span group this cell controls.



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# File 'lib/prawn/table/cell.rb', line 68

def min_width
  return min_width_ignoring_span if @colspan == 1

  # Sum up the largest min-width from each column, including myself.
  min_widths = Hash.new(0)
  dummy_cells.each do |cell|
    min_widths[cell.column] =
      [min_widths[cell.column], cell.min_width].max
  end
  min_widths[column] = [min_widths[column], min_width_ignoring_span].max
  min_widths.values.inject(0, &:+)
end

#min_width_ignoring_span ⇒ Object

If provided, the minimum width that this cell in its column will permit.



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# File 'lib/prawn/table/cell.rb', line 61

def min_width_ignoring_span
  set_width_constraints
  @min_width
end

#natural_content_height ⇒ Object

Returns the height this cell would naturally take on, absent constraints. Must be implemented in subclasses.

Raises:

  • (NotImplementedError) 


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# File 'lib/prawn/table/cell.rb', line 348

def natural_content_height
  raise NotImplementedError,
    "subclasses must implement natural_content_height"
end

#natural_content_width ⇒ Object

Returns the width this cell would naturally take on, absent other constraints. Must be implemented in subclasses.

Raises:

  • (NotImplementedError) 


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# File 'lib/prawn/table/cell.rb', line 298

def natural_content_width
  raise NotImplementedError,
    "subclasses must implement natural_content_width"
end

#padding_bottom ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 500

def padding_bottom
  @padding[2]
end

#padding_bottom=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 504

def padding_bottom=(val)
  @padding[2] = val
end

#padding_left ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 508

def padding_left
  @padding[3]
end

#padding_left=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 512

def padding_left=(val)
  @padding[3] = val
end

#padding_right ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 492

def padding_right
  @padding[1]
end

#padding_right=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 496

def padding_right=(val)
  @padding[1] = val
end

#padding_top ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 484

def padding_top
  @padding[0]
end

#padding_top=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 488

def padding_top=(val)
  @padding[0] = val
end

#set_width_constraints ⇒ Object

Sets the cell’s minimum and maximum width. Deferred until requested because padding and size can change.



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# File 'lib/prawn/table/cell.rb', line 635

def set_width_constraints
  @min_width ||= padding_left + padding_right
  @max_width ||= @pdf.bounds.width
end

#spanned_content_height ⇒ Object

Height of the entire span group.



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# File 'lib/prawn/table/cell.rb', line 341

def spanned_content_height
  height - padding_top - padding_bottom
end

#spanned_content_width ⇒ Object

Width of the entire span group.



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# File 'lib/prawn/table/cell.rb', line 291

def spanned_content_width
  width - padding_left - padding_right
end

#style(options = {}, &block) ⇒ Object

Supports setting multiple properties at once.

cell.style(:padding => 0, :border_width => 2)

is the same as:

cell.padding = 0
cell.border_width = 2



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# File 'lib/prawn/table/cell.rb', line 236

def style(options={}, &block)
  options.each do |k, v|
    send("#{k}=", v) if respond_to?("#{k}=")
  end

  # The block form supports running a single block for multiple cells, as
  # in Cells#style.
  block.call(self) if block
end

#width ⇒ Object

Returns the cell’s width in points, inclusive of padding. If the cell is the master cell of a colspan, returns the width of the entire span group.



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# File 'lib/prawn/table/cell.rb', line 259

def width
  return width_ignoring_span if @colspan == 1 && @rowspan == 1

  # We're in a span group; get the maximum width per column (including
  # the master cell) and sum each column.
  column_widths = Hash.new(0)
  dummy_cells.each do |cell|
    column_widths[cell.column] =
      [column_widths[cell.column], cell.width].max
  end
  column_widths[column] = [column_widths[column], width_ignoring_span].max
  column_widths.values.inject(0, &:+)
end

#width=(w) ⇒ Object

Manually sets the cell’s width, inclusive of padding.



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# File 'lib/prawn/table/cell.rb', line 275

def width=(w)
  @width = @min_width = @max_width = w
end

#width_ignoring_span ⇒ Object

Returns the width of the cell in its first column alone, ignoring any colspans.



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# File 'lib/prawn/table/cell.rb', line 249

def width_ignoring_span
  # We can't ||= here because the FP error accumulates on the round-trip
  # from #content_width.
  defined?(@width) && @width || (content_width + padding_left + padding_right)
end

#x ⇒ Object

x-position of the cell within the parent bounds.



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# File 'lib/prawn/table/cell.rb', line 437

def x
  @point[0]
end

#x=(val) ⇒ Object

Set the x-position of the cell within the parent bounds.



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# File 'lib/prawn/table/cell.rb', line 443

def x=(val)
  @point[0] = val
end

#y ⇒ Object

y-position of the cell within the parent bounds.



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# File 'lib/prawn/table/cell.rb', line 449

def y
  @point[1]
end

#y=(val) ⇒ Object

Set the y-position of the cell within the parent bounds.



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# File 'lib/prawn/table/cell.rb', line 455

def y=(val)
  @point[1] = val
end