public function decrementPosition($count = 1)
    {
        if ($this->isNotInList()) return $this;

        $newPosition = $this->getListifyPosition() - $count;

        if ($newPosition < $this->listifyTop()) {
            $newPosition = $this->listifyTop();
        }

        $this->setListifyPosition($newPosition);

        return $this;
    }