public function ViewsBlock::build in Drupal 8

Same name and namespace in other branches

9 core/modules/views/src/Plugin/Block/ViewsBlock.php \Drupal\views\Plugin\Block\ViewsBlock::build()

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

File

core/modules/views/src/Plugin/Block/ViewsBlock.php, line 24

Class

ViewsBlock: Provides a generic Views block.

Namespace

Drupal\views\Plugin\Block

Code

public function build() {
  $this->view->display_handler
    ->preBlockBuild($this);
  $args = [];
  foreach ($this->view->display_handler
    ->getHandlers('argument') as $argument_name => $argument) {

    // Initialize the argument value. Work around a limitation in
    // \Drupal\views\ViewExecutable::_buildArguments() that skips processing
    // later arguments if an argument with default action "ignore" and no
    // argument is provided.
    $args[$argument_name] = $argument->options['default_action'] == 'ignore' ? 'all' : NULL;
    if (!empty($this->context[$argument_name])) {
      if ($value = $this->context[$argument_name]
        ->getContextValue()) {

        // Context values are often entities, but views arguments expect to
        // receive just the entity ID, convert it.
        if ($value instanceof EntityInterface) {
          $value = $value
            ->id();
        }
        $args[$argument_name] = $value;
      }
    }
  }

  // We ask ViewExecutable::buildRenderable() to avoid creating a render cache
  // entry for the view output by passing FALSE, because we're going to cache
  // the whole block instead.
  if ($output = $this->view
    ->buildRenderable($this->displayID, array_values($args), FALSE)) {

    // Before returning the block output, convert it to a renderable array
    // with contextual links.
    $this
      ->addContextualLinks($output);

    // Block module expects to get a final render array, without another
    // top-level #pre_render callback. So, here we make sure that Views'
    // #pre_render callback has already been applied.
    $output = View::preRenderViewElement($output);

    // Override the label to the dynamic title configured in the view.
    if (empty($this->configuration['views_label']) && $this->view
      ->getTitle()) {
      $output['#title'] = [
        '#markup' => $this->view
          ->getTitle(),
        '#allowed_tags' => Xss::getHtmlTagList(),
      ];
    }

    // When view_build is empty, the actual render array output for this View
    // is going to be empty. In that case, return just #cache, so that the
    // render system knows the reasons (cache contexts & tags) why this Views
    // block is empty, and can cache it accordingly.
    if (empty($output['view_build'])) {
      $output = [
        '#cache' => $output['#cache'],
      ];
    }
    return $output;
  }
  return [];
}

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