PlayerInventory.php

<?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\inventory;
 
use pocketmine\entity\Human;
use pocketmine\item\Item;
use pocketmine\player\Player;
use pocketmine\utils\ObjectSet;
 
class PlayerInventory extends SimpleInventory{
 
    protected Human $holder;
    protected int $itemInHandIndex = 0;
 
    protected ObjectSet $heldItemIndexChangeListeners;
 
    public function __construct(Human $player){
        $this->holder = $player;
        $this->heldItemIndexChangeListeners = new ObjectSet();
        parent::__construct(36);
    }
 
    public function isHotbarSlot(int $slot) : bool{
        return $slot >= 0 && $slot < $this->getHotbarSize();
    }
 
    private function throwIfNotHotbarSlot(int $slot) : void{
        if(!$this->isHotbarSlot($slot)){
            throw new \InvalidArgumentException("$slot is not a valid hotbar slot index (expected 0 - " . ($this->getHotbarSize() - 1) . ")");
        }
    }
 
    public function getHotbarSlotItem(int $hotbarSlot) : Item{
        $this->throwIfNotHotbarSlot($hotbarSlot);
        return $this->getItem($hotbarSlot);
    }
 
    public function getHeldItemIndex() : int{
        return $this->itemInHandIndex;
    }
 
    public function setHeldItemIndex(int $hotbarSlot) : void{
        $this->throwIfNotHotbarSlot($hotbarSlot);
 
        $oldIndex = $this->itemInHandIndex;
        $this->itemInHandIndex = $hotbarSlot;
 
        foreach($this->heldItemIndexChangeListeners as $callback){
            $callback($oldIndex);
        }
    }
 
    public function getHeldItemIndexChangeListeners() : ObjectSet{ return $this->heldItemIndexChangeListeners; }
 
    public function getItemInHand() : Item{
        return $this->getHotbarSlotItem($this->itemInHandIndex);
    }
 
    public function setItemInHand(Item $item) : void{
        $this->setItem($this->getHeldItemIndex(), $item);
    }
 
    public function getHotbarSize() : int{
        return 9;
    }
 
    public function getHolder() : Human{
        return $this->holder;
    }
}