Implemented Lectern (#4708)

Co-authored-by: Covered123 <58715544+JavierLeon9966@users.noreply.github.com>
Co-authored-by: Dylan K. Taylor <dktapps@pmmp.io>

src/block/Lectern.php

@@ -0,0 +1,127 @@
+<?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\block;
+
+use pocketmine\block\tile\Lectern as TileLectern;
+use pocketmine\block\utils\BlockDataSerializer;
+use pocketmine\block\utils\FacesOppositePlacingPlayerTrait;
+use pocketmine\block\utils\HorizontalFacingTrait;
+use pocketmine\item\Item;
+use pocketmine\item\WritableBookBase;
+use pocketmine\math\AxisAlignedBB;
+use pocketmine\math\Facing;
+use pocketmine\math\Vector3;
+use pocketmine\player\Player;
+
+class Lectern extends Transparent{
+	use FacesOppositePlacingPlayerTrait;
+	use HorizontalFacingTrait;
+
+	protected int $viewedPage = 0;
+	protected ?WritableBookBase $book = null;
+
+	public function readStateFromData(int $id, int $stateMeta) : void{
+		$this->facing = BlockDataSerializer::readLegacyHorizontalFacing($stateMeta);
+	}
+
+	public function writeStateToMeta() : int{
+		return BlockDataSerializer::writeLegacyHorizontalFacing($this->facing);
+	}
+
+	public function readStateFromWorld() : void{
+		parent::readStateFromWorld();
+		$tile = $this->position->getWorld()->getTile($this->position);
+		if($tile instanceof TileLectern){
+			$this->viewedPage = $tile->getViewedPage();
+			$this->book = $tile->getBook();
+		}
+	}
+
+	public function writeStateToWorld() : void{
+		parent::writeStateToWorld();
+		$tile = $this->position->getWorld()->getTile($this->position);
+		if($tile instanceof TileLectern){
+			$tile->setViewedPage($this->viewedPage);
+			$tile->setBook($this->book);
+		}
+	}
+
+	public function getStateBitmask() : int{
+		return 0b11;
+	}
+
+	public function getFlammability() : int{
+		return 30;
+	}
+
+	public function getDrops(Item $item) : array{
+		$drops = parent::getDrops($item);
+		if($this->book !== null){
+			$drops[] = clone $this->book;
+		}
+
+		return $drops;
+	}
+
+	protected function recalculateCollisionBoxes() : array{
+		return [AxisAlignedBB::one()->trim(Facing::UP, 0.1)];
+	}
+
+	public function getViewedPage() : int{
+		return $this->viewedPage;
+	}
+
+	/** @return $this */
+	public function setViewedPage(int $viewedPage) : self{
+		$this->viewedPage = $viewedPage;
+		return $this;
+	}
+
+	public function getBook() : ?WritableBookBase{
+		return $this->book !== null ? clone $this->book : null;
+	}
+
+	/** @return $this */
+	public function setBook(?WritableBookBase $book) : self{
+		$this->book = $book !== null && !$book->isNull() ? (clone $book)->setCount(1) : null;
+		$this->viewedPage = 0;
+		return $this;
+	}
+
+	public function onInteract(Item $item, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
+		if($this->book === null && $item instanceof WritableBookBase){
+			$this->position->getWorld()->setBlock($this->position, $this->setBook($item));
+			$item->pop();
+		}
+		return true;
+	}
+
+	public function onAttack(Item $item, int $face, ?Player $player = null) : bool{
+		if($this->book !== null){
+			$this->position->getWorld()->dropItem($this->position->up(), $this->book);
+			$this->position->getWorld()->setBlock($this->position, $this->setBook(null));
+		}
+		return false;
+	}
+}