View.php

<?php

namespace Drupal\views\Element;

use Drupal\Core\Render\Attribute\RenderElement;
use Drupal\Core\Render\Element\RenderElementBase;
use Drupal\views\Exception\ViewRenderElementException;
use Drupal\views\Views;

/**
 * Provides a render element to display a view.
 */
class View extends RenderElementBase {
    
    /**
     * {@inheritdoc}
     */
    public function getInfo() {
        $class = static::class;
        return [
            '#pre_render' => [
                [
                    $class,
                    'preRenderViewElement',
                ],
            ],
            '#name' => NULL,
            '#display_id' => 'default',
            '#arguments' => [],
            '#embed' => TRUE,
            '#cache' => [],
        ];
    }
    
    /**
     * View element pre render callback.
     */
    public static function preRenderViewElement($element) {
        // Allow specific Views displays to explicitly perform pre-rendering, for
        // those displays that need to be able to know the fully built render array.
        if (!empty($element['#pre_rendered'])) {
            return $element;
        }
        if (!isset($element['#view'])) {
            $view = Views::getView($element['#name']);
            if (!$view) {
                throw new ViewRenderElementException("Invalid View name ({$element['#name']}) given.");
            }
        }
        else {
            $view = $element['#view'];
        }
        $element += $view->element;
        $view->element =& $element;
        // Mark the element as being prerendered, so other code like
        // \Drupal\views\ViewExecutable::setCurrentPage knows that its no longer
        // possible to manipulate the $element.
        $view->element['#pre_rendered'] = TRUE;
        if (isset($element['#response'])) {
            $view->setResponse($element['#response']);
        }
        if ($view && $view->access($element['#display_id'])) {
            if (!empty($element['#embed'])) {
                $element['view_build'] = $view->preview($element['#display_id'], $element['#arguments']);
            }
            else {
                // Add contextual links to the view. We need to attach them to the dummy
                // $view_array variable, since contextual_preprocess() requires that they
                // be attached to an array (not an object) in order to process them. For
                // our purposes, it doesn't matter what we attach them to, since once they
                // are processed by contextual_preprocess() they will appear in the
                // $title_suffix variable (which we will then render in
                // views-view.html.twig).
                $view->setDisplay($element['#display_id']);
                // Add the result of the executed view as a child element so any
                // #pre_render elements for the view will get processed. A #pre_render
                // element cannot be added to the main element as this is already inside
                // a #pre_render callback.
                $element['view_build'] = $view->executeDisplay($element['#display_id'], $element['#arguments']);
                if (isset($element['view_build']['#title'])) {
                    $element['#title'] =& $element['view_build']['#title'];
                }
                if (empty($view->display_handler
                    ->getPluginDefinition()['returns_response'])) {
                    // views_add_contextual_links() needs the following information in
                    // order to be attached to the view.
                    $element['#view_id'] = $view->storage
                        ->id();
                    $element['#view_display_show_admin_links'] = $view->getShowAdminLinks();
                    $element['#view_display_plugin_id'] = $view->display_handler
                        ->getPluginId();
                    views_add_contextual_links($element, 'view', $view->current_display);
                }
            }
            if (empty($view->display_handler
                ->getPluginDefinition()['returns_response'])) {
                $element['#attributes']['class'][] = 'views-element-container';
                $element['#theme_wrappers'] = [
                    'container',
                ];
            }
        }
        return $element;
    }

}