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# encoding: utf-8
# text.rb: Text table cells.
#
# Copyright December 2009, Gregory Brown and Brad Ediger. All Rights Reserved.
#
# This is free software. Please see the LICENSE and COPYING files for details.
module Prawn
class Table
class Cell
# A Cell that contains text. Has some limited options to set font family,
# size, and style.
#
# @private
class Text < Cell
TextOptions = [:inline_format, :kerning, :size, :align, :valign,
:rotate, :rotate_around, :leading, :single_line, :skip_encoding,
:overflow, :min_font_size]
TextOptions.each do |option|
define_method("#{option}=") { |v| @text_options[option] = v }
define_method(option) { @text_options[option] }
end
attr_writer :font, :text_color
def initialize(pdf, point, options={})
@text_options = {}
super
end
# Returns the font that will be used to draw this cell.
#
def font
with_font { @pdf.font }
end
# Sets the style of the font in use. Equivalent to the Text::Box
# +style+ option, but we already have a style method.
#
def font_style=(style)
@text_options[:style] = style
end
# Returns the width of this text with no wrapping. This will be far off
# from the final width if the text is long.
#
def natural_content_width
@natural_content_width ||= [styled_width_of(@content), @pdf.bounds.width].min
end
# Returns the natural height of this block of text, wrapped to the
# preset width.
#
def natural_content_height
with_font do
b = text_box(:width => spanned_content_width + FPTolerance)
b.render(:dry_run => true)
b.height + b.line_gap
end
end
# Draws the text content into its bounding box.
#
def draw_content
with_font do
@pdf.move_down((@pdf.font.line_gap + @pdf.font.descender)/2)
with_text_color do
text_box(:width => spanned_content_width + FPTolerance,
:height => spanned_content_height + FPTolerance,
:at => [0, @pdf.cursor]).render
end
end
end
def set_width_constraints
# Sets a reasonable minimum width. If the cell has any content, make
# sure we have enough width to be at least one character wide. This is
# a bit of a hack, but it should work well enough.
unless defined?(@min_width) && @min_width
min_content_width = [natural_content_width, styled_width_of_single_character].min
@min_width = padding_left + padding_right + min_content_width
super
end
end
protected
def with_font
@pdf.save_font do
options = {}
options[:style] = @text_options[:style] if @text_options[:style]
options[:style] ||= @pdf.font.options[:style] if @pdf.font.options[:style]
@pdf.font(defined?(@font) && @font || @pdf.font.family, options)
yield
end
end
def with_text_color
if defined?(@text_color) && @text_color
begin
old_color = @pdf.fill_color || '000000'
@pdf.fill_color(@text_color)
yield
ensure
@pdf.fill_color(old_color)
end
else
yield
end
end
def text_box(extra_options={})
if p = @text_options[:inline_format]
p = [] unless p.is_a?(Array)
options = @text_options.dup
options.delete(:inline_format)
options.merge!(extra_options)
options[:document] = @pdf
array = @pdf.text_formatter.format(@content, *p)
::Prawn::Text::Formatted::Box.new(array,
options.merge(extra_options).merge(:document => @pdf))
else
::Prawn::Text::Box.new(@content, @text_options.merge(extra_options).
merge(:document => @pdf))
end
end
# Returns the width of +text+ under the given text options.
#
def styled_width_of(text)
@pdf.width_of(text, @text_options)
end
private
# Returns the greatest possible width of any single character
# under the given text options.
# (We use this to determine the minimum width of a table cell)
# (Although we currently determine this by measuring "M", it should really
# use whichever character is widest under the current font)
#
def styled_width_of_single_character
styled_width_of("M")
end
end
end
end
end
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