Add EntityFrostWalkerEvent (#6673)

src/entity/Living.php

@@ -38,6 +38,7 @@ use pocketmine\event\entity\EntityDamageByChildEntityEvent;
 use pocketmine\event\entity\EntityDamageByEntityEvent;
 use pocketmine\event\entity\EntityDamageEvent;
 use pocketmine\event\entity\EntityDeathEvent;
+use pocketmine\event\entity\EntityFrostWalkerEvent;
 use pocketmine\inventory\ArmorInventory;
 use pocketmine\inventory\CallbackInventoryListener;
 use pocketmine\inventory\Inventory;
@@ -721,19 +722,30 @@ abstract class Living extends Entity{
 		$y = $this->location->getFloorY() - 1;
 		$baseZ = $this->location->getFloorZ();
 
-		$frostedIce = VanillaBlocks::FROSTED_ICE();
+		$liquid = VanillaBlocks::WATER();
+		$targetBlock = VanillaBlocks::FROSTED_ICE();
+		if(EntityFrostWalkerEvent::hasHandlers()){
+			$ev = new EntityFrostWalkerEvent($this, $radius, $liquid, $targetBlock);
+			$ev->call();
+			if($ev->isCancelled()){
+				return;
+			}
+			$radius = $ev->getRadius();
+			$liquid = $ev->getLiquid();
+			$targetBlock = $ev->getTargetBlock();
+		}
+
 		for($x = $baseX - $radius; $x <= $baseX + $radius; $x++){
 			for($z = $baseZ - $radius; $z <= $baseZ + $radius; $z++){
 				$block = $world->getBlockAt($x, $y, $z);
 				if(
-					!$block instanceof Water ||
-					!$block->isSource() ||
+					!$block->isSameState($liquid) ||
 					$world->getBlockAt($x, $y + 1, $z)->getTypeId() !== BlockTypeIds::AIR ||
 					count($world->getNearbyEntities(AxisAlignedBB::one()->offset($x, $y, $z))) !== 0
 				){
 					continue;
 				}
-				$world->setBlockAt($x, $y, $z, $frostedIce);
+				$world->setBlockAt($x, $y, $z, $targetBlock);
 			}
 		}
 	}

src/event/entity/EntityFrostWalkerEvent.php

@@ -0,0 +1,84 @@
+<?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\entity;
+
+use pocketmine\block\Block;
+use pocketmine\block\Liquid;
+use pocketmine\entity\Living;
+use pocketmine\event\Cancellable;
+use pocketmine\event\CancellableTrait;
+
+/**
+ * Called when an entity moves horizontally while wearing boots enchanted with Frost Walker.
+ *
+ * @phpstan-extends EntityEvent<Living>
+ */
+class EntityFrostWalkerEvent extends EntityEvent implements Cancellable{
+	use CancellableTrait;
+
+	public function __construct(
+		Living $entity,
+		private int $radius,
+		private Liquid $liquid,
+		private Block $targetBlock
+	){
+		$this->entity = $entity;
+	}
+
+	public function getRadius() : int{
+		return $this->radius;
+	}
+
+	public function setRadius(int $radius) : void{
+		$this->radius = $radius;
+	}
+
+	/**
+	 * Returns the liquid that gets frozen
+	 */
+	public function getLiquid() : Liquid{
+		return $this->liquid;
+	}
+
+	/**
+	 * Sets the liquid that gets frozen
+	 */
+	public function setLiquid(Liquid $liquid) : void{
+		$this->liquid = $liquid;
+	}
+
+	/**
+	 * Returns the block that replaces the liquid
+	 */
+	public function getTargetBlock() : Block{
+		return $this->targetBlock;
+	}
+
+	/**
+	 * Sets the block that replaces the liquid
+	 */
+	public function setTargetBlock(Block $targetBlock) : void{
+		$this->targetBlock = $targetBlock;
+	}
+}