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/in_table.rb,
lib/prawn/table/cell/subtable.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.

Direct Known Subclasses

Subtable, Text

Defined Under Namespace

Modules: InTable Classes: Subtable, Text

Constant Summary 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.

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Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary 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 145

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

  options.each { |k, v| send("#{k}=", v) }
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 97

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 85

def border_colors
  @border_colors
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 81

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 77

def borders
  @borders
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 91

def content
  @content
end

#height ⇒ Object

Returns the cell’s height in points, inclusive of padding.



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# File 'lib/prawn/table/cell.rb', line 209

def height
  # We can't ||= here because the FP error accumulates on the round-trip
  # from #content_height.
  @height || (content_height + padding_top + padding_bottom)
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 54

def padding
  @padding
end

Class Method Details

.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 103

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)
    options.update(content)
    content = options[:content]
  else
    options[:content] = content
  end

  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
    # TODO: other types of content
    raise ArgumentError, "Content type not recognized: #{content.inspect}"
  end
end

Instance Method Details

#border_bottom_color ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 379

def border_bottom_color
  @border_colors[2]
end

#border_bottom_color=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 383

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

#border_bottom_width ⇒ Object 



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

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 441

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 336

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 387

def border_left_color
  @border_colors[3]
end

#border_left_color=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 391

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

#border_left_width ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 445

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 449

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

#border_right_color ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 371

def border_right_color
  @border_colors[1]
end

#border_right_color=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 375

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

#border_right_width ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 429

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 433

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 355

def border_top_color
  @border_colors[0]
end

#border_top_color=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 359

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

#border_top_width ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 421

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 425

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 402

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 217

def content_height
  if @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 191

def content_width
  if @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.



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

def draw(pt=[x, y])
  set_width_constraints

  draw_background(pt)
  draw_borders(pt)
  @pdf.bounding_box([pt[0] + padding_left, pt[1] - padding_top], 
                    :width  => content_width + FPTolerance,
                    :height => content_height + FPTolerance) do
    draw_content
  end
end

#max_width ⇒ Object

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



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# File 'lib/prawn/table/cell.rb', line 65

def max_width
  set_width_constraints
  @max_width
end

#min_width ⇒ Object

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



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# File 'lib/prawn/table/cell.rb', line 58

def min_width
  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 228

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 202

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 313

def padding_bottom
  @padding[2]
end

#padding_bottom=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 317

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

#padding_left ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 321

def padding_left
  @padding[3]
end

#padding_left=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 325

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

#padding_right ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 305

def padding_right
  @padding[1]
end

#padding_right=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 309

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

#padding_top ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 297

def padding_top
  @padding[0]
end

#padding_top=(val) ⇒ Object 



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# File 'lib/prawn/table/cell.rb', line 301

def padding_top=(val)
  @padding[0] = val
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 167

def style(options={}, &block)
  options.each { |k, v| send("#{k}=", v) }

  # 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.



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# File 'lib/prawn/table/cell.rb', line 177

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

#width=(w) ⇒ Object

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



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# File 'lib/prawn/table/cell.rb', line 185

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

#x ⇒ Object

x-position of the cell within the parent bounds.



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# File 'lib/prawn/table/cell.rb', line 250

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 256

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 262

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 268

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