Drupal 8 Template for Paragraphs customized for Width and Background color fields.

paragraph--default.html.twig

{#
/**
 * @file
 * Default theme implementation to display a paragraph.
 *
 * Available variables:
 * - paragraph: Full paragraph entity.
 *   - id: The paragraph ID.
 *   - bundle: The type of the paragraph, for example, "image" or "text".
 *   - authorid: The user ID of the paragraph author.
 *   - createdtime: Formatted creation date. Preprocess functions can
 *     reformat it by calling format_date() with the desired parameters on
 *     $variables['paragraph']->getCreatedTime().
 * - content: All paragraph items. Use {{ content }} to print them all,
 *   or print a subset such as {{ content.field_example }}. Use
 *   {{ content|without('field_example') }} to temporarily suppress the printing
 *   of a given child element.
 * - attributes: HTML attributes for the containing element.
 *   The attributes.class element may contain one or more of the following
 *   classes:
 *   - paragraphs: The current template type (also known as a "theming hook").
 *   - paragraphs--type-[type]: The current paragraphs type. For example, if the paragraph is an
 *     "Image" it would result in "paragraphs--type--image". Note that the machine
 *     name will often be in a short form of the human readable label.
 *   - paragraphs--view-mode--[view_mode]: The View Mode of the paragraph; for example, a
 *     preview would result in: "paragraphs--view-mode--preview", and
 *     default: "paragraphs--view-mode--default".
 * - view_mode: View mode; for example, "preview" or "full".
 * - logged_in: Flag for authenticated user status. Will be true when the
 *   current user is a logged-in member.
 * - is_admin: Flag for admin user status. Will be true when the current user
 *   is an administrator.
 *
 * @see template_preprocess_paragraph()
 *
 * @ingroup themeable
 */
#}

{# Renders Width field. #}
{# Sets class name from values in database. #}
{% if content.field_wi|render %}
  {% set layout_width = content.field_wi['#items'].getString() %}
  {% set layout_width_classes = [
    'element-width--medium' == layout_width ? 'paragraph--width__medium',
    'element-width--wide' == layout_width ? 'paragraph--width__wide',
    'element-width--full' == layout_width ? 'paragraph--width__full',
  ]
  %}
{% endif %}

{# Renders Background field. #}
{# Sets class name from values in database. #}
{% if content.field_bg|render %}
  {% set layout_background = content.field_bg['#items'].getString() %}
  {% set layout_background_classes = [
    'element--color element--color__blue' == layout_background ? 'paragraph--color paragraph--color__blue',
    'element--color element--color__blue-light' == layout_background ? 'paragraph--color paragraph--color__blue-light',
    'element--color element--color__gray' == layout_background ? 'paragraph--color paragraph--color__gray',
    'element--color element--color__white' == layout_background ? 'paragraph--color paragraph--color__white',
    'element--color element--color__yellow' == layout_background ? 'paragraph--color paragraph--color__yellow',
  ]
  %}
{% endif %}

{# The template default set classes. #}
{%
set classes = [
'paragraph',
'paragraph--type--' ~ paragraph.bundle|clean_class,
view_mode ? 'paragraph--view-mode--' ~ view_mode|clean_class,
]
%}

{# Merges Width field with classes. #}
{% set width_field = content.field_wi|render %}
{% if width_field %}
  {% set classes = classes|merge(layout_width_classes) %}
{% endif %}

{# Merges Background field with classes. #}
{% set background_field = content.field_bg|render %}
{% if background_field %}
  {% set classes = classes|merge(layout_background_classes) %}
{% endif %}

{# Prints div with classes, and content without Width and Background. #}
<div{{ attributes.addClass(classes) }}>
  <section>
    {{ content|without('field_wi', 'field_bg') }}
  </section>
</div>