--- /dev/null
+<?php
+
+namespace Drupal\dialog_renderer_test\Render\MainContent;
+
+use Drupal\Core\Ajax\AjaxResponse;
+use Drupal\Core\Ajax\OpenModalDialogCommand;
+use Drupal\Core\Controller\TitleResolverInterface;
+use Drupal\Core\Render\MainContent\ModalRenderer;
+use Drupal\Core\Routing\RouteMatchInterface;
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * Default main content renderer for wide modal dialog requests.
+ *
+ * This test class is copied from \Drupal\Core\Render\MainContent\ModalRenderer
+ * to demonstrate selecting a different render via 'data-dialog-renderer' link
+ * attribute.
+ */
+class WideModalRenderer extends ModalRenderer {
+
+ /**
+ * The mode, either 'wide' or 'extra_wide'.
+ *
+ * @var string
+ */
+ protected $mode;
+
+ /**
+ * Constructs a new WideModalRenderer.
+ *
+ * @param \Drupal\Core\Controller\TitleResolverInterface $title_resolver
+ * The title resolver.
+ * @param string $mode
+ * The mode, either 'wide' or 'extra_wide'.
+ */
+ public function __construct(TitleResolverInterface $title_resolver, $mode = 'wide') {
+ parent::__construct($title_resolver);
+ $this->mode = $mode;
+ }
+
+
+ /**
+ * {@inheritdoc}
+ */
+ public function renderResponse(array $main_content, Request $request, RouteMatchInterface $route_match) {
+ $response = new AjaxResponse();
+
+ // First render the main content, because it might provide a title.
+ $content = drupal_render_root($main_content);
+
+ // Attach the library necessary for using the OpenModalDialogCommand and set
+ // the attachments for this Ajax response.
+ $main_content['#attached']['library'][] = 'core/drupal.dialog.ajax';
+ $response->setAttachments($main_content['#attached']);
+
+ // If the main content doesn't provide a title, use the title resolver.
+ $title = isset($main_content['#title']) ? $main_content['#title'] : $this->titleResolver->getTitle($request, $route_match->getRouteObject());
+
+ // Determine the title: use the title provided by the main content if any,
+ // otherwise get it from the routing information.
+ $options = $request->request->get('dialogOptions', []);
+ // Override width option.
+ switch ($this->mode) {
+ case 'wide':
+ $options['width'] = 700;
+ break;
+
+ case 'extra_wide':
+ $options['width'] = 1000;
+ break;
+ }
+
+ $response->addCommand(new OpenModalDialogCommand($title, $content, $options));
+ return $response;
+ }
+
+}