prawnpdf/prawn

# frozen_string_literal: true

require 'prawn/manual_builder'

Prawn::ManualBuilder::Chapter.new do
  title 'Text Box Extensions'

  text do
    prose <<~TEXT
      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.
    TEXT
  end

  example new_page: true do
    module TriangleBox
      def available_width
        height + 25
      end
    end

    y_position = cursor
    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
end