class Dropbutton

Provides a render element for a set of links rendered as a drop-down button.

By default, this element sets #theme so that the 'links' theme hook is used for rendering, with suffixes so that themes can override this specifically without overriding all links theming. If the #subtype property is provided in your render array with value 'foo', #theme is set to links__dropbutton__foo; if not, it's links__dropbutton; both of these can be overridden by setting the #theme property in your render array. See template_preprocess_links() for documentation on the other properties used in theming; for instance, use element property #links to provide $variables['links'] for theming.

Properties:

• #links: An array of links to actions. See template_preprocess_links() for documentation the properties of links in this array.
• #dropbutton_type: A string defining a type of dropbutton variant for styling proposes. Renders as class `dropbutton--#dropbutton_type`.

Usage Example:

$form['actions']['extra_actions'] = [
  '#type' => 'dropbutton',
  '#dropbutton_type' => 'small',
  '#links' => [
    'simple_form' => [
      'title' => $this->t('Simple Form'),
      'url' => Url::fromRoute('fapi_example.simple_form'),
    ],
    'demo' => [
      'title' => $this->t('Build Demo'),
      'url' => Url::fromRoute('fapi_example.build_demo'),
    ],
  ],
];

Hierarchy

• class \Drupal\Component\Plugin\PluginBase extends \Drupal\Component\Plugin\PluginInspectionInterface, \Drupal\Component\Plugin\DerivativeInspectionInterface
  • class \Drupal\Core\Plugin\PluginBase uses \Drupal\Core\StringTranslation\StringTranslationTrait, \Drupal\Core\DependencyInjection\DependencySerializationTrait, \Drupal\Core\Messenger\MessengerTrait implements \Drupal\Component\Plugin\PluginBase
    • class \Drupal\Core\Render\Element\RenderElementBase extends \Drupal\Core\Render\Element\ElementInterface implements \Drupal\Core\Plugin\PluginBase
      • class \Drupal\Core\Render\Element\Dropbutton implements \Drupal\Core\Render\Element\RenderElementBase

Expanded class hierarchy of Dropbutton

See also

\Drupal\Core\Render\Element\Operations

File

core/lib/Drupal/Core/Render/Element/Dropbutton.php, line 45

Namespace

class Dropbutton extends RenderElementBase {
  
  /**
   * {@inheritdoc}
   */
  public function getInfo() {
    $class = static::class;
    return [
      '#pre_render' => [
        [
          $class,
          'preRenderDropbutton',
        ],
      ],
      '#theme' => 'links__dropbutton',
    ];
  }
  
  /**
   * Pre-render callback: Attaches the dropbutton library and required markup.
   */
  public static function preRenderDropbutton($element) {
    $element['#attached']['library'][] = 'core/drupal.dropbutton';
    $element['#attributes']['class'][] = 'dropbutton';
    if (!empty($element['#dropbutton_type'])) {
      $element['#attributes']['class'][] = 'dropbutton--' . $element['#dropbutton_type'];
    }
    if (!isset($element['#theme_wrappers'])) {
      $element['#theme_wrappers'] = [];
    }
    array_unshift($element['#theme_wrappers'], 'dropbutton_wrapper');
    // Enable targeted theming of specific dropbuttons (e.g., 'operations' or
    // 'operations__node').
    if (isset($element['#subtype'])) {
      $element['#theme'] .= '__' . $element['#subtype'];
    }
    return $element;
  }

}

Members