protected function BootstrapDropdown::preprocessLinks in Express 8

Preprocess links in the variables array to convert them from dropbuttons.

Parameters

\Drupal\bootstrap\Utility\Variables $variables: A variables object.

1 call to BootstrapDropdown::preprocessLinks()

BootstrapDropdown::preprocessVariables in themes/contrib/bootstrap/src/Plugin/Preprocess/BootstrapDropdown.php

Preprocess the variables array.

File

themes/contrib/bootstrap/src/Plugin/Preprocess/BootstrapDropdown.php, line 54

Contains \Drupal\bootstrap\Plugin\Preprocess\BootstrapDropdown.

Class

BootstrapDropdown

Pre-processes variables for the "bootstrap_dropdown" theme hook.

Namespace

Drupal\bootstrap\Plugin\Preprocess

Code

protected function preprocessLinks(Variables $variables) {

  // Convert "dropbutton" theme suggestion variables.
  if (Unicode::strpos($variables->theme_hook_original, 'links__dropbutton') !== FALSE && !empty($variables->links)) {
    $operations = !!Unicode::strpos($variables->theme_hook_original, 'operations');

    // Normal dropbutton links are not actually render arrays, convert them.
    foreach ($variables->links as &$element) {
      if (isset($element['title']) && $element['url']) {

        // Preserve query parameters (if any)
        if (!empty($element['query'])) {
          $url_query = $element['url']
            ->getOption('query') ?: [];
          $element['url']
            ->setOption('query', NestedArray::mergeDeep($url_query, $element['query']));
        }

        // Build render array.
        $element = [
          '#type' => 'link',
          '#title' => $element['title'],
          '#url' => $element['url'],
        ];
      }
    }
    $items = Element::createStandalone();
    $primary_action = NULL;
    $links = Element::create($variables->links);

    // Iterate over all provided "links". The array may be associative, so
    // this cannot rely on the key to be numeric, it must be tracked manually.
    $i = -1;
    foreach ($links
      ->children(TRUE) as $key => $child) {
      $i++;

      // The first item is always the "primary link".
      if ($i === 0) {

        // Must generate an ID for this child because the toggle will use it.
        $child
          ->getProperty('id', $child
          ->getAttribute('id', Html::getUniqueId('dropdown-item')));
        $primary_action = $child
          ->addClass('hidden');
      }

      // If actually a "link", add it to the items array directly.
      if ($child
        ->isType('link')) {
        $items->{$key}->link = $child
          ->getArrayCopy();
      }
      else {

        // Hide the original element
        $items->{$key}->element = $child
          ->addClass('hidden')
          ->getArrayCopy();

        // Retrieve any set HTML identifier for the link, generating a new
        // one if necessary.
        $id = $child
          ->getProperty('id', $child
          ->getAttribute('id', Html::getUniqueId('dropdown-item')));
        $items->{$key}->link = Element::createStandalone([
          '#type' => 'link',
          '#title' => $child
            ->getProperty('value', $child
            ->getProperty('title', $child
            ->getProperty('text'))),
          '#url' => Url::fromUserInput('#'),
          '#attributes' => [
            'data-dropdown-target' => "#{$id}",
          ],
        ]);

        // Also hide the real link if it's the primary action.
        if ($i === 0) {
          $items->{$key}->link
            ->addClass('hidden');
        }
      }
    }

    // Create a toggle button, extracting relevant info from primary action.
    $toggle = Element::createStandalone([
      '#type' => 'button',
      '#attributes' => $primary_action
        ->getAttributes()
        ->getArrayCopy(),
      '#value' => $primary_action
        ->getProperty('value', $primary_action
        ->getProperty('title', $primary_action
        ->getProperty('text'))),
    ]);

    // Remove the "hidden" class that was added to the primary action.
    $toggle
      ->removeClass('hidden')
      ->removeAttribute('id')
      ->setAttribute('data-dropdown-target', '#' . $primary_action
      ->getAttribute('id'));

    // Make operations smaller.
    if ($operations) {
      $toggle
        ->setButtonSize('btn-xs', FALSE);
    }

    // Add the toggle render array to the variables.
    $variables->toggle = $toggle
      ->getArrayCopy();

    // Determine if toggle should be a split button.
    $variables->split = count($items) > 1;

    // Add the items variable for "bootstrap_dropdown".
    $variables->items = $items
      ->getArrayCopy();

    // Remove the unnecessary "links" variable now.
    unset($variables->links);
  }
}