` tag with the special URI to render thumbnails deferred. * * ``` * * ``` * * @see https://docs.typo3.org/permalink/t3viewhelper:typo3-backend-thumbnail */ final class ThumbnailViewHelper extends AbstractTagBasedViewHelper { /** * @var string */ protected $tagName = 'img'; public function __construct( private readonly ImageService $imageService ) { parent::__construct(); } public function initializeArguments(): void { parent::initializeArguments(); $this->registerArgument('src', 'string', 'a path to a file, a combined FAL identifier or an uid (int). If $treatIdAsReference is set, the integer is considered the uid of the sys_file_reference record. If you already got a FAL object, consider using the $image parameter instead', false, ''); $this->registerArgument('treatIdAsReference', 'bool', 'given src argument is a sys_file_reference record', false, false); $this->registerArgument('image', 'object', 'a FAL object (\\TYPO3\\CMS\\Core\\Resource\\File or \\TYPO3\\CMS\\Core\\Resource\\FileReference)'); $this->registerArgument('crop', 'string|bool', 'overrule cropping of image (setting to FALSE disables the cropping set in FileReference)'); $this->registerArgument('cropVariant', 'string', 'select a cropping variant, in case multiple croppings have been specified or stored in FileReference', false, 'default'); $this->registerArgument('width', 'string', 'width of the image. This can be a numeric value representing the fixed width of the image in pixels. But you can also perform simple calculations by adding "m" or "c" to the value. See imgResource.width for possible options.'); $this->registerArgument('height', 'string', 'height of the image. This can be a numeric value representing the fixed height of the image in pixels. But you can also perform simple calculations by adding "m" or "c" to the value. See imgResource.width for possible options.'); $this->registerArgument('minWidth', 'int', 'minimum width of the image'); $this->registerArgument('minHeight', 'int', 'minimum height of the image'); $this->registerArgument('maxWidth', 'int', 'maximum width of the image'); $this->registerArgument('maxHeight', 'int', 'maximum height of the image'); $this->registerArgument('context', 'string', 'context for image rendering', false, ProcessedFile::CONTEXT_IMAGEPREVIEW); } public function render(): string { if (($this->arguments['src'] === '' && $this->arguments['image'] === null) || ($this->arguments['src'] !== '' && $this->arguments['image'] !== null)) { throw new InvalidArgumentValueException('You must either specify a string src or a File object.', 1533290762); } try { $image = $this->imageService->getImage((string)$this->arguments['src'], $this->arguments['image'], (bool)$this->arguments['treatIdAsReference']); $cropString = $this->arguments['crop']; if ($cropString === null && $image->hasProperty('crop') && $image->getProperty('crop')) { $cropString = $image->getProperty('crop'); } $cropVariantCollection = CropVariantCollection::create((string)$cropString); $cropVariant = $this->arguments['cropVariant'] ?: 'default'; $cropArea = $cropVariantCollection->getCropArea($cropVariant); $processingInstructions = []; if (!$cropArea->isEmpty()) { $processingInstructions['crop'] = $cropArea->makeAbsoluteBasedOnFile($image); } foreach (['width', 'height', 'minWidth', 'minHeight', 'maxWidth', 'maxHeight'] as $argument) { if (!empty($this->arguments[$argument])) { $processingInstructions[$argument] = $this->arguments[$argument]; } } if (is_callable([$image, 'getOriginalFile'])) { // Get the original file from the file reference $image = $image->getOriginalFile(); } $processedFile = $image->process($this->arguments['context'], $processingInstructions); $imageUri = $processedFile->getPublicUrl(); if (!$this->tag->hasAttribute('data-focus-area')) { $focusArea = $cropVariantCollection->getFocusArea($cropVariant); if (!$focusArea->isEmpty()) { $this->tag->addAttribute('data-focus-area', (string)$focusArea->makeAbsoluteBasedOnFile($image)); } } $this->tag->addAttribute('src', $imageUri); $this->tag->addAttribute('width', $processedFile->getProperty('width')); $this->tag->addAttribute('height', $processedFile->getProperty('height')); $alt = $image->getProperty('alternative'); $title = $image->getProperty('title'); // The alt-attribute is mandatory to have valid html-code, therefore add it even if it is empty if (empty($this->additionalArguments['alt'])) { $this->tag->addAttribute('alt', $alt); } if (empty($this->additionalArguments['title']) && $title) { // Set title from image if not manually given as VH argument $this->tag->addAttribute('title', $title); } } catch (ResourceDoesNotExistException $e) { // thrown if file does not exist throw new Exception($e->getMessage(), 1533294109, $e); } catch (\UnexpectedValueException $e) { // thrown if a file has been replaced with a folder throw new Exception($e->getMessage(), 1533294113, $e); } catch (\RuntimeException $e) { // RuntimeException thrown if a file is outside of a storage throw new Exception($e->getMessage(), 1533294116, $e); } catch (\InvalidArgumentException $e) { // thrown if file storage does not exist throw new Exception($e->getMessage(), 1533294120, $e); } return $this->tag->render(); } }