public function CourseNavigationBlock::build in Course 8.3

Same name and namespace in other branches

1. 8.2 src/Plugin/Block/CourseNavigationBlock.php \Drupal\course\Plugin\Block\CourseNavigationBlock::build()
2. 3.x src/Plugin/Block/CourseNavigationBlock.php \Drupal\course\Plugin\Block\CourseNavigationBlock::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

See also

\Drupal\block\BlockViewBuilder

File

src/Plugin/Block/CourseNavigationBlock.php, line 34

Class

CourseNavigationBlock

Provides a course navigation block.

Namespace

Drupal\course\Plugin\Block

Code

public function build() {
  $build['#cache']['max-age'] = 0;
  $course = course_get_context();
  $account = \Drupal::currentUser();
  if ($course && $course
    ->isEnrolled($account)) {
    $links = $course
      ->getNavigation($account);
    $items = array();
    foreach ($links as $key => $value) {
      $items[] = array(
        '#class' => array(
          'course-nav-' . $key,
        ),
        '#markup' => $value
          ->toString(),
      );
    }

    // Add javascript poller to update the next step button.
    $build['nav']['#attached']['library'][] = 'course/nav';
    $build['nav'] = [
      '#theme' => 'item_list',
      '#items' => $items,
      '#title' => '',
      '#type' => 'ul',
      '#attributes' => array(
        'id' => 'course-nav',
      ),
    ];
  }
  return $build;
}