/**
* Gets a given layout with empty regions and relevant metadata.
*
* @param \Drupal\page_manager\PageVariantInterface $page_variant
* The page variant entity.
* @param string $layout_id
* The machine name of the requested layout.
*
* @return \Symfony\Component\HttpFoundation\JsonResponse
*/
public function getLayout(PageVariantInterface $page_variant, $layout_id)
{
/** @var \Drupal\panels\Plugin\DisplayVariant\PanelsDisplayVariant $variant_plugin */
$variant_plugin = $page_variant->getVariantPlugin();
// Build the requested layout.
$configuration = $variant_plugin->getConfiguration();
$configuration['layout'] = $layout_id;
$variant_plugin->setConfiguration($configuration);
// Inherit our PageVariant's contexts before rendering.
$variant_plugin->setContexts($page_variant->getContexts());
$regions = $variant_plugin->getRegionNames();
$region_data = [];
$region_content = [];
// Compile region content and metadata.
foreach ($regions as $id => $label) {
// Wrap the region with a class/data attribute that our app can use.
$region_name = Html::getClass("block-region-{$id}");
$region_content[$id] = ['#prefix' => '<div class="' . $region_name . '" data-region-name="' . $id . '">', '#suffix' => '</div>'];
// Format region metadata.
$region_data[] = ['name' => $id, 'label' => $label];
}
$build = $variant_plugin->getLayout()->build($region_content);
// Get the current layout.
$current_layout = $variant_plugin->getLayout()->getPluginId();
// Get a list of all available layouts.
$layouts = $this->layoutPluginManager->getLayoutOptions();
$data = ['id' => $layout_id, 'label' => $layouts[$layout_id], 'current' => $current_layout == $layout_id, 'html' => $this->renderer->render($build), 'regions' => $region_data];
// Update temp store.
$this->savePageVariant($page_variant);
// Return a structured JSON response for our Backbone App.
return new JsonResponse($data);
}
/**
* Get a list of layout options suitable for a select list.
*
* @return array
*/
protected function getLayoutOptions()
{
$options = [MegaMenuInterface::NO_LAYOUT => $this->t('No layout')];
return $options + $this->layoutPluginManager->getLayoutOptions();
}
