# encoding: utf-8
#
# We've already seen one way of using text boxes with the <code>text_box</code>
# method. Turns out this method is just a convenience for using the
# <code>Prawn::Text::Box</code> class as it creates a new object and call
# <code>render</code> on it.
#
# Knowing that any extensions we add to <code>Prawn::Text::Box</code> will take
# effect when we use the <code>text_box</code> method. To add an extension all
# we need to do is append the <code>Prawn::Text::Box.extensions</code> array
# with a module.
#
require File.expand_path(File.join(File.dirname(__FILE__),
                                   %w[.. example_helper]))

filename = File.basename(__FILE__).gsub('.rb', '.pdf')
Prawn::Example.generate(filename) do
  module TriangleBox
    def available_width
      height + 25
    end
  end

  y_position = cursor - 10
  width      = 100
  height     = 100
  
  Prawn::Text::Box.extensions << TriangleBox
  stroke_rectangle([0, y_position], width, height)
  text_box("A" * 100,
           :at => [0, y_position],
           :width => width,
           :height => height)
  
  Prawn::Text::Formatted::Box.extensions << TriangleBox
  stroke_rectangle([200, y_position], width, height)
  formatted_text_box([:text => "A" * 100, :color => "009900"],
                     :at => [200, y_position],
                     :width => width,
                     :height => height)

  # Here we clear the extensions array
  Prawn::Text::Box.extensions.clear
  Prawn::Text::Formatted::Box.extensions.clear
end