Event when a block support is broken

src/event/block/BlockSupportBreakEvent.php

@@ -0,0 +1,85 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+ */
+
+declare(strict_types=1);
+
+namespace pocketmine\event\block;
+
+use pocketmine\block\Block;
+use pocketmine\item\Item;
+
+/**
+ * Called when a block is destroyed because its support has been destroyed.
+ */
+class BlockSupportBreakEvent extends BlockEvent{
+	/** @var Item[] */
+	protected array $blockDrops = [];
+
+	/**
+	 * @param Item[] $drops
+	 */
+	public function __construct(
+		Block $block,
+		array $drops = [],
+		protected int $xpDrops = 0
+	){
+		parent::__construct($block);
+		$this->setDrops($drops);
+	}
+
+	/**
+	 * @return Item[]
+	 */
+	public function getDrops() : array{
+		return $this->blockDrops;
+	}
+
+	/**
+	 * @param Item[] $drops
+	 */
+	public function setDrops(array $drops) : void{
+		$this->setDropsVariadic(...$drops);
+	}
+
+	/**
+	 * Variadic hack for easy array member type enforcement.
+	 */
+	public function setDropsVariadic(Item ...$drops) : void{
+		$this->blockDrops = $drops;
+	}
+
+	/**
+	 * Returns how much XP will be dropped by breaking this block.
+	 */
+	public function getXpDropAmount() : int{
+		return $this->xpDrops;
+	}
+
+	/**
+	 * Sets how much XP will be dropped by breaking this block.
+	 */
+	public function setXpDropAmount(int $amount) : void{
+		if($amount < 0){
+			throw new \InvalidArgumentException("Amount must be at least zero");
+		}
+		$this->xpDrops = $amount;
+	}
+}

src/world/World.php

@@ -46,6 +46,7 @@
 use pocketmine\entity\object\ItemEntity;
 use pocketmine\event\block\BlockBreakEvent;
 use pocketmine\event\block\BlockPlaceEvent;
+use pocketmine\event\block\BlockSupportBreakEvent;
 use pocketmine\event\block\BlockUpdateEvent;
 use pocketmine\event\player\PlayerInteractEvent;
 use pocketmine\event\world\ChunkLoadEvent;
@@ -2096,7 +2097,14 @@ public function useBreakOn(Vector3 $vector, Item &$item = null, ?Player $player
 
 		}elseif(!$target->getBreakInfo()->isBreakable()){
 			return false;
-		}
+		}else{
+            $ev = new BlockSupportBreakEvent($target, $drops, $xpDrop);
+
+            $ev->call();
+
+            $drops = $ev->getDrops();
+            $xpDrop = $ev->getXpDropAmount();
+        }
 
 		foreach($affectedBlocks as $t){
 			$this->destroyBlockInternal($t, $item, $player, $createParticles, $returnedItems);