SlotChangeActionBuilder.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\transaction;
 
use pocketmine\inventory\BaseInventory;
use pocketmine\inventory\Inventory;
use pocketmine\inventory\transaction\action\SlotChangeAction;
use pocketmine\item\Item;
use pocketmine\item\VanillaItems;
use pocketmine\player\InventoryWindow;
 
final class SlotChangeActionBuilder extends BaseInventory{
 
    private \SplFixedArray $changedSlots;
 
    public function __construct(
        private InventoryWindow $inventoryWindow
    ){
        parent::__construct();
        $this->changedSlots = new \SplFixedArray($this->inventoryWindow->getInventory()->getSize());
    }
 
    public function getInventoryWindow() : InventoryWindow{
        return $this->inventoryWindow;
    }
 
    protected function internalSetContents(array $items) : void{
        for($i = 0, $size = $this->getSize(); $i < $size; ++$i){
            if(!isset($items[$i])){
                $this->clear($i);
            }else{
                $this->setItem($i, $items[$i]);
            }
        }
    }
 
    protected function internalSetItem(int $index, Item $item) : void{
        if(!$item->equalsExact($this->inventoryWindow->getInventory()->getItem($index))){
            $this->changedSlots[$index] = $item->isNull() ? VanillaItems::AIR() : clone $item;
        }
    }
 
    public function getSize() : int{
        return $this->inventoryWindow->getInventory()->getSize();
    }
 
    public function getItem(int $index) : Item{
        return $this->changedSlots[$index] !== null ? clone $this->changedSlots[$index] : $this->inventoryWindow->getInventory()->getItem($index);
    }
 
    public function getContents(bool $includeEmpty = false) : array{
        $contents = $this->inventoryWindow->getInventory()->getContents($includeEmpty);
        foreach($this->changedSlots as $index => $item){
            if($item !== null){
                if($includeEmpty || !$item->isNull()){
                    $contents[$index] = clone $item;
                }else{
                    unset($contents[$index]);
                }
            }
        }
        return $contents;
    }
 
    public function getMatchingItemCount(int $slot, Item $test, bool $checkTags) : int{
        $slotItem = $this->changedSlots[$slot] ?? null;
        if($slotItem !== null){
            return $slotItem->equals($test, true, $checkTags) ? $slotItem->getCount() : 0;
        }
        return $this->inventoryWindow->getInventory()->getMatchingItemCount($slot, $test, $checkTags);
    }
 
    public function generateActions() : array{
        $result = [];
        $inventory = $this->inventoryWindow->getInventory();
        foreach($this->changedSlots as $index => $newItem){
            if($newItem !== null){
                $oldItem = $inventory->getItem($index);
                if(!$newItem->equalsExact($oldItem)){
                    $result[] = new SlotChangeAction($this->inventoryWindow, $index, $oldItem, $newItem);
                }
            }
        }
        return $result;
    }
 
    public function getViewers() : array{
        return [];
    }
 
    public function removeAllWindows() : void{
        //NOOP
    }
 
    public function onOpen(InventoryWindow $window) : void{
        //NOOP
    }
 
    public function onClose(InventoryWindow $window) : void{
        //NOOP
    }
}