function CommentDefaultFormatter::viewElements

Overrides FormatterInterface::viewElements

File

core/modules/comment/src/Plugin/Field/FieldFormatter/CommentDefaultFormatter.php, line 158

Class

CommentDefaultFormatter

Provides a default comment formatter.

Namespace

Code

public function viewElements(FieldItemListInterface $items, $langcode) {
    $elements = [];
    $output = [];
    $field_name = $this->fieldDefinition
        ->getName();
    $entity = $items->getEntity();
    $status = $items->status;
    if ($status != CommentItemInterface::HIDDEN && empty($entity->in_preview) && !in_array($this->viewMode, [
        'search_result',
        'search_index',
    ])) {
        $comment_settings = $this->getFieldSettings();
        // Only attempt to render comments if the entity has visible comments.
        // Unpublished comments are not included in
        // $entity->get($field_name)->comment_count, but unpublished comments
        // should display if the user is an administrator.
        $elements['#cache']['contexts'][] = 'user.permissions';
        if ($this->currentUser
            ->hasPermission('access comments') || $this->currentUser
            ->hasPermission('administer comments')) {
            $output['comments'] = [];
            if ($entity->get($field_name)->comment_count || $this->currentUser
                ->hasPermission('administer comments')) {
                $mode = $comment_settings['default_mode'];
                $comments_per_page = $comment_settings['per_page'];
                $comments = $this->storage
                    ->loadThread($entity, $field_name, $mode, $comments_per_page, $this->getSetting('pager_id'));
                if ($comments) {
                    $build = $this->viewBuilder
                        ->viewMultiple($comments, $this->getSetting('view_mode'));
                    $build['pager']['#type'] = 'pager';
                    // CommentController::commentPermalink() calculates the page number
                    // where a specific comment appears and does a subrequest pointing to
                    // that page, we need to pass that subrequest route to our pager to
                    // keep the pager working.
                    $build['pager']['#route_name'] = $this->routeMatch
                        ->getRouteObject();
                    $build['pager']['#route_parameters'] = $this->routeMatch
                        ->getRawParameters()
                        ->all();
                    if ($this->getSetting('pager_id')) {
                        $build['pager']['#element'] = $this->getSetting('pager_id');
                    }
                    $output['comments'] += $build;
                }
            }
        }
        // Append comment form if the comments are open and the form is set to
        // display below the entity. Do not show the form for the print view mode.
        if ($status == CommentItemInterface::OPEN && $comment_settings['form_location'] == CommentItemInterface::FORM_BELOW && $this->viewMode != 'print') {
            // Only show the add comment form if the user has permission.
            $elements['#cache']['contexts'][] = 'user.roles';
            if ($this->currentUser
                ->hasPermission('post comments')) {
                $output['comment_form'] = [
                    '#lazy_builder' => [
                        'comment.lazy_builders:renderForm',
                        [
                            $entity->getEntityTypeId(),
                            $entity->id(),
                            $field_name,
                            $this->getFieldSetting('comment_type'),
                        ],
                    ],
                    '#create_placeholder' => TRUE,
                ];
            }
        }
        $elements[] = $output + [
            '#comment_type' => $this->getFieldSetting('comment_type'),
            '#comment_display_mode' => $this->getFieldSetting('default_mode'),
            'comments' => [],
            'comment_form' => [],
        ];
    }
    return $elements;
}