added BlockItemPickupEvent class (#4402)

src/event/block/BlockItemPickupEvent.php

@@ -0,0 +1,60 @@
+<?php
+
+declare(strict_types=1);
+
+namespace pocketmine\event\block;
+
+use pocketmine\block\Block;
+use pocketmine\entity\Entity;
+use pocketmine\event\Cancellable;
+use pocketmine\event\CancellableTrait;
+use pocketmine\inventory\Inventory;
+use pocketmine\item\Item;
+
+/**
+ * Called when a block picks up an item, arrow, etc.
+ */
+class BlockItemPickupEvent extends BlockEvent implements Cancellable{
+	use CancellableTrait;
+
+	public function __construct(
+		Block $collector,
+		private Entity $origin,
+		private Item $item,
+		private ?Inventory $inventory
+	){
+		parent::__construct($collector);
+	}
+
+	public function getOrigin() : Entity{
+		return $this->origin;
+	}
+
+	/**
+	 * Items to be received
+	 */
+	public function getItem() : Item{
+		return clone $this->item;
+	}
+
+	/**
+	 * Change the items to receive.
+	 */
+	public function setItem(Item $item) : void{
+		$this->item = clone $item;
+	}
+
+	/**
+	 * Inventory to which received items will be added.
+	 */
+	public function getInventory() : ?Inventory{
+		return $this->inventory;
+	}
+
+	/**
+	 * Change the inventory to which received items are added.
+	 */
+	public function setInventory(?Inventory $inventory) : void{
+		$this->inventory = $inventory;
+	}
+}