CallbackInventoryListener.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\item\Item;
use pocketmine\utils\Utils;
 
class CallbackInventoryListener implements InventoryListener{
 
    //TODO: turn the closure signatures into type aliases when PHPStan supports them
 
    public function __construct(
        private ?\Closure $onSlotChange,
        private ?\Closure $onContentChange
    ){
        if($onSlotChange !== null){
            Utils::validateCallableSignature(function(Inventory $inventory, int $slot, Item $oldItem) : void{}, $onSlotChange);
        }
        if($onContentChange !== null){
            Utils::validateCallableSignature(function(Inventory $inventory, array $oldContents) : void{}, $onContentChange);
        }
    }
 
    public static function onAnyChange(\Closure $onChange) : self{
        return new self(
            static function(Inventory $inventory, int $unused, Item $unusedB) use ($onChange) : void{
                $onChange($inventory);
            },
            static function(Inventory $inventory, array $unused) use ($onChange) : void{
                $onChange($inventory);
            }
        );
    }
 
    public function onSlotChange(Inventory $inventory, int $slot, Item $oldItem) : void{
        if($this->onSlotChange !== null){
            ($this->onSlotChange)($inventory, $slot, $oldItem);
        }
    }
 
    public function onContentChange(Inventory $inventory, array $oldContents) : void{
        if($this->onContentChange !== null){
            ($this->onContentChange)($inventory, $oldContents);
        }
    }
}