module Playbook::FlexGrow

def flex_grow_props
  selected_props = flex_grow_options.keys.select { |sk| try(sk) }
  return nil unless selected_props.present?
  selected_props.map do |k|
    flex_grow_value = send(k)
    if flex_grow_value.is_a?(Hash)
      flex_grow_value.map do |media_size, grow_value|
        "flex_grow_#{media_size}_#{grow_value}" if flex_grow_values.include? grow_value.to_s
      end
    else
      "flex_grow_#{flex_grow_value}" if flex_grow_values.include? flex_grow_value.to_s
    end
  end.compact.join(" ")
end