public static function RenderElement::preRenderGroup in Drupal 9

Same name and namespace in other branches

1. 8 core/lib/Drupal/Core/Render/Element/RenderElement.php \Drupal\Core\Render\Element\RenderElement::preRenderGroup()

Adds members of this group as actual elements for rendering.

Parameters

array $element: An associative array containing the properties and children of the element.

Return value

array The modified element with all group members.

File

core/lib/Drupal/Core/Render/Element/RenderElement.php, line 160

Class

RenderElement

Provides a base class for render element plugins.

Namespace

Drupal\Core\Render\Element

Code

public static function preRenderGroup($element) {

  // The element may be rendered outside of a Form API context.
  if (!isset($element['#parents']) || !isset($element['#groups'])) {
    return $element;
  }

  // Inject group member elements belonging to this group.
  $parents = implode('][', $element['#parents']);
  $children = Element::children($element['#groups'][$parents]);
  if (!empty($children)) {
    foreach ($children as $key) {

      // Break references and indicate that the element should be rendered as
      // group member.
      $child = (array) $element['#groups'][$parents][$key];
      $child['#group_details'] = TRUE;

      // Inject the element as new child element.
      $element[] = $child;
      $sort = TRUE;
    }

    // Re-sort the element's children if we injected group member elements.
    if (isset($sort)) {
      $element['#sorted'] = FALSE;
    }
  }
  if (isset($element['#group'])) {

    // Contains form element summary functionalities.
    $element['#attached']['library'][] = 'core/drupal.form';
    $group = $element['#group'];

    // If this element belongs to a group, but the group-holding element does
    // not exist, we need to render it (at its original location).
    if (!isset($element['#groups'][$group]['#group_exists'])) {

      // Intentionally empty to clarify the flow; we simply return $element.
    }
    elseif (!empty($element['#group_details'])) {

      // Intentionally empty to clarify the flow; we simply return $element.
    }
    elseif (Element::children($element['#groups'][$group])) {
      $element['#printed'] = TRUE;
    }
  }
  return $element;
}