UpdateQty.php

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<?php
namespace Magento\Sales\Controller\Adminhtml\Order\Creditmemo;

use Magento\Framework\App\Action\HttpPostActionInterface as HttpPostActionInterface;
use Magento\Backend\App\Action;

class UpdateQty extends \Magento\Backend\App\Action implements HttpPostActionInterface
{
    const ADMIN_RESOURCE = 'Magento_Sales::sales_creditmemo';

    protected $creditmemoLoader;

    protected $pagePageFactory;

    protected $resultJsonFactory;

    protected $resultRawFactory;

    public function __construct(
        Action\Context $context,
        \Magento\Sales\Controller\Adminhtml\Order\CreditmemoLoader $creditmemoLoader,
        \Magento\Framework\View\Result\PageFactory $resultPageFactory,
        \Magento\Framework\Controller\Result\JsonFactory $resultJsonFactory,
        \Magento\Framework\Controller\Result\RawFactory $resultRawFactory
    ) {
        $this->creditmemoLoader = $creditmemoLoader;
        $this->resultPageFactory = $resultPageFactory;
        $this->resultJsonFactory = $resultJsonFactory;
        $this->resultRawFactory = $resultRawFactory;
        parent::__construct($context);
    }

    public function execute()
    {
        try {
            $this->creditmemoLoader->setOrderId($this->getRequest()->getParam('order_id'));
            $this->creditmemoLoader->setCreditmemoId($this->getRequest()->getParam('creditmemo_id'));
            $this->creditmemoLoader->setCreditmemo($this->getRequest()->getParam('creditmemo'));
            $this->creditmemoLoader->setInvoiceId($this->getRequest()->getParam('invoice_id'));
            $this->creditmemoLoader->load();
            $resultPage = $this->resultPageFactory->create();
            $response = $resultPage->getLayout()->getBlock('order_items')->toHtml();
        } catch (\Magento\Framework\Exception\LocalizedException $e) {
            $response = ['error' => true, 'message' => $e->getMessage()];
        } catch (\Exception $e) {
            $response = ['error' => true, 'message' => __('We can\'t update the item\'s quantity right now.')];
        }
        if (is_array($response)) {
            $resultJson = $this->resultJsonFactory->create();
            $resultJson->setData($response);
            return $resultJson;
        } else {
            $resultRaw = $this->resultRawFactory->create();
            $resultRaw->setContents($response);
            return $resultRaw;
        }
    }
}