/**
  * @param string $theme
  *
  * @return array
  */
 public function getLayouts($theme)
 {
     if (null === $this->layouts) {
         $this->layouts = [];
         foreach ($this->themeManager->getThemes() as $id => $theme2) {
             if ($theme === $id) {
                 foreach ($theme2->getPaths() as $resource) {
                     $path = $this->themeManager->locateResource($resource);
                     if (is_dir($path)) {
                         $finder = new Finder();
                         $finder->files()->in($path)->depth(0)->name('*.html.twig');
                         /** @var \Symfony\Component\Finder\SplFileInfo $file */
                         foreach ($finder as $file) {
                             $this->layouts[] = $resource . '/' . $file->getRelativePathname();
                         }
                     }
                 }
             }
         }
     }
     return $this->layouts;
 }
 /**
  * @return array
  */
 protected function getChoices()
 {
     $themes = array_keys($this->themeManager->getThemes());
     return array_combine($themes, $themes);
 }