template_preprocess_toolbar

template_preprocess_toolbar(&$variables)

function template_preprocess_toolbar(&$variables) {
  $element = $variables['element'];

  // Prepare the toolbar attributes.
  $variables['attributes'] = $element['#attributes'];
  $variables['toolbar_attributes'] = new Attribute($element['#bar']['#attributes']);
  $variables['toolbar_heading'] = $element['#bar']['#heading'];

  // Prepare the trays and tabs for each toolbar item as well as the remainder
  // variable that will hold any non-tray, non-tab elements.
  $variables['trays'] = array();
  $variables['tabs'] = array();
  $variables['remainder'] = array();
  foreach (Element::children($element) as $key) {
    // Early rendering to collect the wrapper attributes from
    // ToolbarItem elements.
    if (!empty($element[$key])) {
      Drupal::service('renderer')->render($element[$key]);
    }
    // Add the tray.
    if (isset($element[$key]['tray'])) {
      $attributes = array();
      if (!empty($element[$key]['tray']['#wrapper_attributes'])) {
        $attributes = $element[$key]['tray']['#wrapper_attributes'];
      }
      $variables['trays'][$key] = array(
        'links' => $element[$key]['tray'],
        'attributes' => new Attribute($attributes),
      );
      if (array_key_exists('#heading', $element[$key]['tray'])) {
        $variables['trays'][$key]['label'] = $element[$key]['tray']['#heading'];
      }
    }

    // Add the tab.
    if (isset($element[$key]['tab'])) {
      $attributes = array();
      // Pass the wrapper attributes along.
      if (!empty($element[$key]['#wrapper_attributes'])) {
        $attributes = $element[$key]['#wrapper_attributes'];
      }

      $variables['tabs'][$key] = array(
        'link' => $element[$key]['tab'],
        'attributes' => new Attribute($attributes),
      );
    }

    // Add other non-tray, non-tab child elements to the remainder variable for
    // later rendering.
    foreach (Element::children($element[$key]) as $child_key) {
      if (!in_array($child_key, array('tray', 'tab'))) {
        $variables['remainder'][$key][$child_key] = $element[$key][$child_key];
      }
    }
  }
}