Livestreet CMS - How to get the ID of the topic in which you are currently in the block file?

Question

PHP

class PluginNegative_BlockNegative extends Block
{
       public function Exec() {
    /**
     * Получаем список юзеров
     */


    $aResult = $this->Vote_GetUsersIdByTopicsVote(2, -1);
    $aNegative = $this->User_GetUsersByArrayId($aResult);
    /**
     * Загружаем переменные в шаблон
     */
    $this->Viewer_Assign('aNegative',$aNegative);
  }
}

As in the Exec function - Get the id of the current topic. Where the user is right now.
Tried like this

$this->getId();
$this->Topic_getId();

Api does not give solutions - but I can’t think of it myself. Thank you in advance.