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# encoding: utf-8
# span.rb : Implements text columns
#
# Copyright September 2008, Gregory Brown. All Rights Reserved.
#
# This is free software. Please see the LICENSE and COPYING files for details.
module Prawn
class Document
# A span is a special purpose bounding box that allows a column of
# elements to be positioned relative to the margin_box.
#
# Arguments:
# +width+:: The width of the column in PDF points
#
# Options:
# <tt>:position</tt>:: One of :left, :center, :right or an x offset
#
# This method is typically used for flowing a column of text from one
# page to the next.
#
# span(350, :position => :center) do
# text "Here's some centered text in a 350 point column. " * 100
# end
#
def span(width, options={})
Prawn.verify_options [:position], options
original_position = self.y
# FIXME: How many effing times do I want to write this same code?
left_boundary = case(options[:position] || :left)
when :left
margin_box.absolute_left
when :center
margin_box.absolute_left + margin_box.width / 2.0 - width /2.0
when :right
margin_box.absolute_right - width
when Numeric
margin_box.absolute_left + options[:position]
else
raise ArgumentError, "Invalid option for :position"
end
# we need to bust out of whatever nested bounding boxes we're in.
canvas do
bounding_box([left_boundary,
margin_box.absolute_top], :width => width) do
self.y = original_position
yield
end
end
end
end
end
Version data entries
12 entries across 12 versions & 4 rubygems