public function FacetBlock::build in Facets 8

Builds and returns the renderable array for this block plugin.

If a block should not be rendered because it has no content, then this method must also ensure to return no content: it must then only return an empty array, or an empty array with #cache set (with cacheability metadata indicating the circumstances for it being empty).

Return value

array A renderable array representing the content of the block.

Overrides BlockPluginInterface::build

See also

\Drupal\block\BlockViewBuilder

File

src/Plugin/Block/FacetBlock.php, line 72

Class

FacetBlock

Exposes a facet rendered as a block.

Namespace

Drupal\facets\Plugin\Block

Code

public function build() {

  /** @var \Drupal\facets\FacetInterface $facet */
  $facet = $this->facetStorage
    ->load($this
    ->getDerivativeId());

  // No need to build the facet if it does not need to be visible.
  if ($facet
    ->getOnlyVisibleWhenFacetSourceIsVisible() && (!$facet
    ->getFacetSource() || !$facet
    ->getFacetSource()
    ->isRenderedInCurrentRequest())) {
    return [];
  }

  // Let the facet_manager build the facets.
  $build = $this->facetManager
    ->build($facet);
  if (!empty($build)) {

    // Add extra elements from facet source, for example, ajax scripts.
    // @see Drupal\facets\Plugin\facets\facet_source\SearchApiDisplay

    /* @var \Drupal\facets\FacetSource\FacetSourcePluginInterface $facet_source */
    $facet_source = $facet
      ->getFacetSource();
    $build += $facet_source
      ->buildFacet();

    // Add contextual links only when we have results.
    $build['#contextual_links']['facets_facet'] = [
      'route_parameters' => [
        'facets_facet' => $facet
          ->id(),
      ],
    ];
    if (!empty($build[0]['#attributes']['class']) && in_array('facet-active', $build[0]['#attributes']['class'], TRUE)) {
      $build['#attributes']['class'][] = 'facet-active';
    }
    else {
      $build['#attributes']['class'][] = 'facet-inactive';
    }

    // Add classes needed for ajax.
    if (!empty($build['#use_ajax'])) {
      $build['#attributes']['class'][] = 'block-facets-ajax';

      // The configuration block id isn't always set in the configuration.
      if (isset($this->configuration['block_id'])) {
        $build['#attributes']['class'][] = 'js-facet-block-id-' . $this->configuration['block_id'];
      }
      else {
        $build['#attributes']['class'][] = 'js-facet-block-id-' . $this->pluginId;
      }
    }
  }
  return $build;
}