EntityTranslationRenderTrait.php

<?php

namespace Drupal\views\Entity\Render;

use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\TypedData\TranslatableInterface;
use Drupal\views\Plugin\views\PluginBase;
use Drupal\views\ResultRow;

/**
 * Trait used to instantiate the view's entity translation renderer.
 */
trait EntityTranslationRenderTrait {
    
    /**
     * The renderer to be used to render the entity row.
     *
     * @var \Drupal\views\Entity\Render\EntityTranslationRendererBase
     */
    protected $entityTranslationRenderer;
    
    /**
     * Returns the current renderer.
     *
     * @return \Drupal\views\Entity\Render\EntityTranslationRendererBase
     *   The configured renderer.
     */
    protected function getEntityTranslationRenderer() {
        if (!isset($this->entityTranslationRenderer)) {
            $view = $this->getView();
            $rendering_language = $view->display_handler
                ->getOption('rendering_language');
            $langcode = NULL;
            $dynamic_renderers = [
                '***LANGUAGE_entity_translation***' => 'TranslationLanguageRenderer',
                '***LANGUAGE_entity_default***' => 'DefaultLanguageRenderer',
            ];
            if (isset($dynamic_renderers[$rendering_language])) {
                // Dynamic language set based on result rows or instance defaults.
                $renderer = $dynamic_renderers[$rendering_language];
            }
            else {
                if (strpos($rendering_language, '***LANGUAGE_') !== FALSE) {
                    $langcode = PluginBase::queryLanguageSubstitutions()[$rendering_language];
                }
                else {
                    // Specific langcode set.
                    $langcode = $rendering_language;
                }
                $renderer = 'ConfigurableLanguageRenderer';
            }
            $class = '\\Drupal\\views\\Entity\\Render\\' . $renderer;
            $entity_type = $this->getEntityTypeManager()
                ->getDefinition($this->getEntityTypeId());
            $this->entityTranslationRenderer = new $class($view, $this->getLanguageManager(), $entity_type, $langcode);
        }
        return $this->entityTranslationRenderer;
    }
    
    /**
     * Returns the entity translation matching the configured row language.
     *
     * @param \Drupal\Core\Entity\EntityInterface $entity
     *   The entity object the field value being processed is attached to.
     * @param \Drupal\views\ResultRow $row
     *   The result row the field value being processed belongs to.
     *
     * @return \Drupal\Core\Entity\FieldableEntityInterface
     *   The entity translation object for the specified row.
     */
    public function getEntityTranslation(EntityInterface $entity, ResultRow $row) {
        // We assume the same language should be used for all entity fields
        // belonging to a single row, even if they are attached to different entity
        // types. Below we apply language fallback to ensure a valid value is always
        // picked.
        $translation = $entity;
        if ($entity instanceof TranslatableInterface && count($entity->getTranslationLanguages()) > 1) {
            $langcode = $this->getEntityTranslationRenderer()
                ->getLangcode($row);
            $translation = $this->getEntityRepository()
                ->getTranslationFromContext($entity, $langcode);
        }
        return $translation;
    }
    
    /**
     * Returns the entity type identifier.
     *
     * @return string
     *   The entity type identifier.
     */
    public abstract function getEntityTypeId();
    
    /**
     * Returns the language manager.
     *
     * @return \Drupal\Core\Language\LanguageManagerInterface
     *   The language manager.
     */
    protected abstract function getLanguageManager();
    
    /**
     * Returns the top object of a view.
     *
     * @return \Drupal\views\ViewExecutable
     *   The view object.
     */
    protected abstract function getView();

}