### Home Classes Methods

### In Files

- lib/prawn/table/cell/text.rb
- lib/prawn/table/cell/subtable.rb
- lib/prawn/table/cell/in_table.rb
- lib/prawn/table/cell.rb

### Parent

Object

### Namespace

- MODULE Prawn::Table::Cell::InTable
- CLASS Prawn::Table::Cell::Subtable
- CLASS Prawn::Table::Cell::Text

### Methods

- ::draw_cells
- ::make
- ::new
- #border_bottom_color
- #border_bottom_color=
- #border_bottom_width
- #border_bottom_width=
- #border_color=
- #border_colors=
- #border_left_color
- #border_left_color=
- #border_left_width
- #border_left_width=
- #border_right_color
- #border_right_color=
- #border_right_width
- #border_right_width=
- #border_top_color
- #border_top_color=
- #border_top_width
- #border_top_width=
- #border_width=
- #border_widths=
- #content_height
- #content_width
- #draw
- #draw_background
- #draw_borders
- #draw_bounded_content
- #draw_content
- #height
- #max_width
- #min_width
- #natural_content_height
- #natural_content_width
- #padding=
- #padding_bottom
- #padding_bottom=
- #padding_left
- #padding_left=
- #padding_right
- #padding_right=
- #padding_top
- #padding_top=
- #set_width_constraints
- #style
- #width
- #width=
- #x
- #x=
- #y
- #y=

### Files

- COPYING
- GPLv2
- GPLv3
- LICENSE

### Class/Module Index

Quicksearch

- Prawn
- Prawn::Core
- Prawn::Core::Page
- Prawn::Core::Page::GraphicsState
- Prawn::Core::Reference
- Prawn::Document
- Prawn::Document::BoundingBox
- Prawn::Document::ColumnBox
- Prawn::Document::GraphicsState
- Prawn::Document::Grid
- Prawn::Document::Internals
- Prawn::Document::PageGeometry
- Prawn::Document::Security
- Prawn::Document::Snapshot
- Prawn::Encoding
- Prawn::Errors
- Prawn::Font
- Prawn::Font::AFM
- Prawn::Font::DFont
- Prawn::Font::TTF
- Prawn::GraphicState
- Prawn::GraphicStateStack
- Prawn::Graphics
- Prawn::Graphics::CapStyle
- Prawn::Graphics::Color
- Prawn::Graphics::Dash
- Prawn::Graphics::Gradient
- Prawn::Graphics::JoinStyle
- Prawn::Graphics::Transformation
- Prawn::Graphics::Transparency
- Prawn::Images
- Prawn::Images::JPG
- Prawn::Images::PNG
- Prawn::Layout
- Prawn::Measurements
- Prawn::Outline
- Prawn::Stamp
- Prawn::Table
- Prawn::Table::Cell
- Prawn::Table::Cell::InTable
- Prawn::Table::Cell::Subtable
- Prawn::Table::Cell::Text
- Prawn::Table::Cells
- Prawn::Text
- Prawn::Text::Box
- Prawn::Text::Formatted
- Prawn::Text::Formatted::Box
- Prawn::Text::Formatted::Fragment
- Prawn::Text::Formatted::Parser
- Arcfour
- Numeric

No matching classes.

# Prawn::Table::Cell

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.

### Constants

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.

### Attributes

background_color[RW]

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.

border_colors[R]

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

border_widths[R]

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

borders[RW]

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

content[RW]

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.

height[W]

Manually specify the cell's height.

padding[R]

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

### Public Class Methods

draw_cells(cells) click to toggle source

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

    # File lib/prawn/table/cell.rb, line 247
    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={}) click to toggle source

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.

    # File lib/prawn/table/cell.rb, line 102
    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

new(pdf, point, options={}) click to toggle source

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.

    # File lib/prawn/table/cell.rb, line 144
    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

### Public Instance Methods

border_bottom_color() click to toggle source

    # File lib/prawn/table/cell.rb, line 402
    def border_bottom_color
      @border_colors[2]
    end

border_bottom_color=(val) click to toggle source

    # File lib/prawn/table/cell.rb, line 406
    def border_bottom_color=(val)
      @border_colors[2] = val
    end

border_bottom_width() click to toggle source

    # File lib/prawn/table/cell.rb, line 460
    def border_bottom_width
      @borders.include?(:bottom) ? @border_widths[2] : 0
    end

border_bottom_width=(val) click to toggle source

    # File lib/prawn/table/cell.rb, line 464
    def border_bottom_width=(val)
      @border_widths[2] = val
    end

border_color=(color) click to toggle source

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]

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

Also aliased as: border_colors=
border_colors=(color) click to toggle source
Alias for: border_color=
border_left_color() click to toggle source

    # File lib/prawn/table/cell.rb, line 410
    def border_left_color
      @border_colors[3]
    end

border_left_color=(val) click to toggle source

    # File lib/prawn/table/cell.rb, line 414
    def border_left_color=(val)
      @border_colors[3] = val
    end

border_left_width() click to toggle source

    # File lib/prawn/table/cell.rb, line 468
    def border_left_width
      @borders.include?(:left) ? @border_widths[3] : 0
    end

border_left_width=(val) click to toggle source

    # File lib/prawn/table/cell.rb, line 472
    def border_left_width=(val)
      @border_widths[3] = val
    end

border_right_color() click to toggle source

    # File lib/prawn/table/cell.rb, line 394
    def border_right_color
      @border_colors[1]
    end

border_right_color=(val) click to toggle source

    # File lib/prawn/table/cell.rb, line 398
    def border_right_color=(val)
      @border_colors[1] = val
    end

border_right_width() click to toggle source

    # File lib/prawn/table/cell.rb, line 452
    def border_right_width
      @borders.include?(:right) ? @border_widths[1] : 0
    end

border_right_width=(val) click to toggle source

    # File lib/prawn/table/cell.rb, line 456
    def border_right_width=(val)
      @border_widths[1] = val
    end

border_top_color() click to toggle source

    # File lib/prawn/table/cell.rb, line 378
    def border_top_color
      @border_colors[0]
    end

border_top_color=(val) click to toggle source

    # File lib/prawn/table/cell.rb, line 382
    def border_top_color=(val)
      @border_colors[0] = val
    end

border_top_width() click to toggle source

    # File lib/prawn/table/cell.rb, line 444
    def border_top_width
      @borders.include?(:top) ? @border_widths[0] : 0
    end

border_top_width=(val) click to toggle source

    # File lib/prawn/table/cell.rb, line 448
    def border_top_width=(val)
      @border_widths[0] = val
    end

border_width=(width) click to toggle source

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]

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

Also aliased as: border_widths=
border_widths=(width) click to toggle source
Alias for: border_width=
content_height() click to toggle source

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

    # File lib/prawn/table/cell.rb, line 216
    def content_height
      if @height # manually set
        return @height - padding_top - padding_bottom
      end

      natural_content_height
    end

content_width() click to toggle source

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

    # File lib/prawn/table/cell.rb, line 190
    def content_width
      if @width # manually set
        return @width - padding_left - padding_right
      end

      natural_content_width
    end

draw(pt=[x, y]) click to toggle source

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.

    # File lib/prawn/table/cell.rb, line 239
    def draw(pt=[x, y])
      self.class.draw_cells([[self, pt]])
    end

draw_background(pt) click to toggle source

Draws the cell's background color.

    # File lib/prawn/table/cell.rb, line 486
    def draw_background(pt)
      if @background_color
        @pdf.mask(:fill_color) do
          @pdf.fill_color @background_color
          @pdf.fill_rectangle pt, width, height
        end
      end
    end

draw_borders(pt) click to toggle source

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.

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

          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

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

draw_bounded_content(pt) click to toggle source

Draws the cell's content at the point provided.

    # File lib/prawn/table/cell.rb, line 261
    def draw_bounded_content(pt)
      @pdf.float do
        @pdf.bounding_box([pt[0] + padding_left, pt[1] - padding_top],
                          :width  => content_width + FPTolerance,
                          :height => content_height + FPTolerance) do
          draw_content
        end
      end
    end

draw_content() click to toggle source

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

    # File lib/prawn/table/cell.rb, line 536
    def draw_content
      raise NotImplementedError, "subclasses must implement draw_content"
    end

height() click to toggle source

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

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

max_width() click to toggle source

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

    # File lib/prawn/table/cell.rb, line 64
    def max_width
      set_width_constraints
      @max_width
    end

min_width() click to toggle source

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

    # File lib/prawn/table/cell.rb, line 57
    def min_width
      set_width_constraints
      @min_width
    end

natural_content_height() click to toggle source

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

    # File lib/prawn/table/cell.rb, line 227
    def natural_content_height
      raise NotImplementedError,
        "subclasses must implement natural_content_height"
    end

natural_content_width() click to toggle source

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

    # File lib/prawn/table/cell.rb, line 201
    def natural_content_width
      raise NotImplementedError,
        "subclasses must implement natural_content_width"
    end

padding=(pad) click to toggle source

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

- an integer (sets all padding)

- a two-element array [vertical, horizontal]

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

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

    # File lib/prawn/table/cell.rb, line 302
    def padding=(pad)
      @padding = case
      when pad.nil?
        [0, 0, 0, 0]
      when Numeric === pad # all padding
        [pad, pad, pad, pad]
      when pad.length == 2 # vert, horiz
        [pad[0], pad[1], pad[0], pad[1]]
      when pad.length == 3 # top, horiz, bottom
        [pad[0], pad[1], pad[2], pad[1]]
      when pad.length == 4 # top, right, bottom, left
        [pad[0], pad[1], pad[2], pad[3]]
      else
        raise ArgumentError, ":padding must be a number or an array [v,h] " +
          "or [t,r,b,l]"
      end
    end

padding_bottom() click to toggle source

    # File lib/prawn/table/cell.rb, line 336
    def padding_bottom
      @padding[2]
    end

padding_bottom=(val) click to toggle source

    # File lib/prawn/table/cell.rb, line 340
    def padding_bottom=(val)
      @padding[2] = val
    end

padding_left() click to toggle source

    # File lib/prawn/table/cell.rb, line 344
    def padding_left
      @padding[3]
    end

padding_left=(val) click to toggle source

    # File lib/prawn/table/cell.rb, line 348
    def padding_left=(val)
      @padding[3] = val
    end

padding_right() click to toggle source

    # File lib/prawn/table/cell.rb, line 328
    def padding_right
      @padding[1]
    end

padding_right=(val) click to toggle source

    # File lib/prawn/table/cell.rb, line 332
    def padding_right=(val)
      @padding[1] = val
    end

padding_top() click to toggle source

    # File lib/prawn/table/cell.rb, line 320
    def padding_top
      @padding[0]
    end

padding_top=(val) click to toggle source

    # File lib/prawn/table/cell.rb, line 324
    def padding_top=(val)
      @padding[0] = val
    end

set_width_constraints() click to toggle source

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

    # File lib/prawn/table/cell.rb, line 479
    def set_width_constraints
      @min_width ||= padding_left + padding_right
      @max_width ||= @pdf.bounds.width
    end

style(options={}, &block) click to toggle source

Supports setting multiple properties at once.

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

is the same as:

    cell.padding = 0
    cell.border_width = 2

    # File lib/prawn/table/cell.rb, line 166
    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() click to toggle source

Returns the cell's width in points, inclusive of padding.

    # File lib/prawn/table/cell.rb, line 176
    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) click to toggle source

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

    # File lib/prawn/table/cell.rb, line 184
    def width=(w)
      @width = @min_width = @max_width = w
    end

x() click to toggle source

x-position of the cell within the parent bounds.

    # File lib/prawn/table/cell.rb, line 273
    def x
      @point[0]
    end

x=(val) click to toggle source

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

    # File lib/prawn/table/cell.rb, line 279
    def x=(val)
      @point[0] = val
    end

y() click to toggle source

y-position of the cell within the parent bounds.

    # File lib/prawn/table/cell.rb, line 285
    def y
      @point[1]
    end

y=(val) click to toggle source

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

    # File lib/prawn/table/cell.rb, line 291
    def y=(val)
      @point[1] = val
    end

[Validate]

Generated with the Darkfish Rdoc Generator 2.