Add FarmlandHydrationChangeEvent (#5916)

src/block/Farmland.php

@@ -26,6 +26,7 @@ namespace pocketmine\block;
 use pocketmine\data\runtime\RuntimeDataDescriber;
 use pocketmine\entity\Entity;
 use pocketmine\entity\Living;
+use pocketmine\event\block\FarmlandHydrationChangeEvent;
 use pocketmine\event\entity\EntityTrampleFarmlandEvent;
 use pocketmine\item\Item;
 use pocketmine\math\AxisAlignedBB;
@@ -73,14 +74,22 @@ class Farmland extends Transparent{
 		$world = $this->position->getWorld();
 		if(!$this->canHydrate()){
 			if($this->wetness > 0){
-				$this->wetness--;
+				$event = new FarmlandHydrationChangeEvent($this, $this->wetness, $this->wetness - 1);
-				$world->setBlock($this->position, $this, false);
+				$event->call();
+				if(!$event->isCancelled()){
+					$this->wetness = $event->getNewHydration();
+					$world->setBlock($this->position, $this, false);
+				}
 			}else{
 				$world->setBlock($this->position, VanillaBlocks::DIRT());
 			}
 		}elseif($this->wetness < self::MAX_WETNESS){
-			$this->wetness = self::MAX_WETNESS;
+			$event = new FarmlandHydrationChangeEvent($this, $this->wetness, self::MAX_WETNESS);
-			$world->setBlock($this->position, $this, false);
+			$event->call();
+			if(!$event->isCancelled()){
+				$this->wetness = $event->getNewHydration();
+				$world->setBlock($this->position, $this, false);
+			}
 		}
 	}
 

src/event/block/FarmlandHydrationChangeEvent.php

@@ -0,0 +1,59 @@
+<?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\block\Farmland;
+use pocketmine\event\Cancellable;
+use pocketmine\event\CancellableTrait;
+
+/**
+ * Called when farmland hydration is updated.
+ */
+class FarmlandHydrationChangeEvent extends BlockEvent implements Cancellable{
+	use CancellableTrait;
+
+	public function __construct(
+		Block $block,
+		private int $oldHydration,
+		private int $newHydration,
+	){
+		parent::__construct($block);
+	}
+
+	public function getOldHydration() : int{
+		return $this->oldHydration;
+	}
+
+	public function getNewHydration() : int{
+		return $this->newHydration;
+	}
+
+	public function setNewHydration(int $hydration) : void{
+		if($hydration < 0 || $hydration > Farmland::MAX_WETNESS){
+			throw new \InvalidArgumentException("Hydration must be in range 0 ... " . Farmland::MAX_WETNESS);
+		}
+		$this->newHydration = $hydration;
+	}
+}