trait.ilObjFilePreviewHandler.php

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<?php

trait ilObjFilePreviewHandler
{
    protected function deletePreview() : void
    {
        // only normal files are supported
        if ($this->getMode() !== self::MODE_OBJECT) {
            return;
        }
        ilPreview::deletePreview($this->getId());
    }

    protected function createPreview($force = false) : void
    {
        // only normal files are supported
        if ($this->getMode() != self::MODE_OBJECT) {
            return;
        }
        ilPreview::createPreview($this, $force);
    }
}