Prevent someone from taking something from your chest

How exactly I prevent with the transaction event, that someone can take something from a Chest?

 

set the event to be cancelled...

 

$event->setCancelled(TRUE);

 

When I do this:

PHP:

public function onTransaction(InventoryTransactionEvent $event){
      $trans = $event->getTransaction()->getTransactions();
      foreach($trans as $t){
        $inv = $event->getTransaction()->getInventories();
        foreach($inv as $i){
          $chest = $i->getHolder();
          if($chest instanceof Chest){
            $event->setCancelled(true);
          }
          if($chest instanceof Player){
            $event->setCancelled(true);
          }
        }
      }
  }

About every third click you still get the item into the inventory

 

What is Chest? \pocketmine\block\Chest or \pocketmine\tile\Chest?

 

Flavius12 of EvolSoft has created a nice plugin called ChestLocker.

Its not updated to the latest api as of now, but i have access to the repo and i will update and submit to poggit.!