FileItem::getPreviewSizes

private function getPreviewSizes(): ?array
{
	$previewParameters = [];
	$diskFile = $this->getDiskFile();

	if (TypeFile::isImage($diskFile))
	{
		$previewParameters = $diskFile->getFile();
	}
	if (TypeFile::isVideo($diskFile->getName()))
	{
		$previewParameters = $diskFile->getView()->getPreviewData();
	}

	if (empty($previewParameters))
	{
		return null;
	}

	return [
		'height' => (int)$previewParameters['HEIGHT'],
		'width' => (int)$previewParameters['WIDTH'],
	];
}