module Fourmi::Prawn::Utils
  module Callbacks
    class HighlightCallback
      def initialize(color, document, padding_top = 0, padding_left = 0)
        @color    = color
        @document = document
        @padding_top = padding_top
        @padding_left = padding_left
      end

      def render_behind(fragment)
        original_color = @document.fill_color
        @document.fill_color = @color
        @document.fill_rectangle([fragment.left - @padding_left, fragment.top + @padding_top], fragment.width + 2 * @padding_left, fragment.height + 2 * @padding_top)
        @document.fill_color = original_color
      end
    end
  end
end