themeHandler = $theme_handler; } /** * {@inheritdoc} */ public static function create(ContainerInterface $container) { return new static( $container->get('theme_handler') ); } /** * Calls a method on a block and reloads the listing page. * * @param \Drupal\block\BlockInterface $block * The block being acted upon. * @param string $op * The operation to perform, e.g., 'enable' or 'disable'. * * @return \Symfony\Component\HttpFoundation\RedirectResponse * A redirect back to the listing page. */ public function performOperation(BlockInterface $block, $op) { $block->$op()->save(); $this->messenger()->addStatus($this->t('The block settings have been updated.')); return $this->redirect('block.admin_display'); } /** * Returns a block theme demo page. * * @param string $theme * The name of the theme. * * @return array * A #type 'page' render array containing the block region demo. */ public function demo($theme) { if (!$this->themeHandler->hasUi($theme)) { throw new NotFoundHttpException(); } $page = [ '#title' => Html::escape($this->themeHandler->getName($theme)), '#type' => 'page', '#attached' => [ 'drupalSettings' => [ // The block demonstration page is not marked as an administrative // page by \Drupal::service('router.admin_context')->isAdminRoute() // function in order to use the frontend theme. Since JavaScript // relies on a proper separation of admin pages, it needs to know this // is an actual administrative page. 'path' => ['currentPathIsAdmin' => TRUE], ], 'library' => [ 'block/drupal.block.admin', ], ], ]; // Show descriptions in each visible page region, nothing else. $visible_regions = $this->getVisibleRegionNames($theme); foreach (array_keys($visible_regions) as $region) { $page[$region]['block_description'] = [ '#type' => 'inline_template', '#template' => '

', '#context' => ['region_name' => $visible_regions[$region]], ]; } return $page; } /** * Returns the human-readable list of regions keyed by machine name. * * @param string $theme * The name of the theme. * * @return array * An array of human-readable region names keyed by machine name. */ protected function getVisibleRegionNames($theme) { return system_region_list($theme, REGIONS_VISIBLE); } }