Pcompared.php

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<?php
namespace Magento\Sales\Block\Adminhtml\Order\Create\Sidebar;

use Magento\Framework\Pricing\PriceCurrencyInterface;

class Pcompared extends \Magento\Sales\Block\Adminhtml\Order\Create\Sidebar\AbstractSidebar
{
    protected $_productFactory;

    protected $_event;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Backend\Model\Session\Quote $sessionQuote,
        \Magento\Sales\Model\AdminOrder\Create $orderCreate,
        PriceCurrencyInterface $priceCurrency,
        \Magento\Sales\Model\Config $salesConfig,
        \Magento\Reports\Model\ResourceModel\Event $event,
        \Magento\Catalog\Model\ProductFactory $productFactory,
        array $data = []
    ) {
        $this->_event = $event;
        $this->_productFactory = $productFactory;
        parent::__construct($context, $sessionQuote, $orderCreate, $priceCurrency, $salesConfig, $data);
    }

    protected function _construct()
    {
        parent::_construct();
        $this->setId('sales_order_create_sidebar_pcompared');
        $this->setDataId('pcompared');
    }

    public function getHeaderText()
    {
        return __('Recently Compared Products');
    }

    public function getItemCollection()
    {
        $productCollection = $this->getData('item_collection');
        if ($productCollection === null) {
            // get products to skip
            $skipProducts = [];
            if ($collection = $this->getCreateOrderModel()->getCustomerCompareList()) {
                $collection = $collection->getItemCollection()->useProductItem(
                    true
                )->setStoreId(
                    $this->getStoreId()
                )->setCustomerId(
                    $this->getCustomerId()
                )->load();
                foreach ($collection as $_item) {
                    $skipProducts[] = $_item->getProductId();
                }
            }

            // prepare products collection and apply visitors log to it
            $productCollection = $this->_productFactory->create()->getCollection()->setStoreId(
                $this->getQuote()->getStoreId()
            )->addStoreFilter(
                $this->getQuote()->getStoreId()
            )->addAttributeToSelect(
                'name'
            )->addAttributeToSelect(
                'price'
            )->addAttributeToSelect(
                'small_image'
            );
            $this->_event->applyLogToCollection(
                $productCollection,
                \Magento\Reports\Model\Event::EVENT_PRODUCT_COMPARE,
                $this->getCustomerId(),
                0,
                $skipProducts
            );

            $productCollection->load();
            $this->setData('item_collection', $productCollection);
        }
        return $productCollection;
    }

    public function canRemoveItems()
    {
        return false;
    }

    public function getIdentifierId($item)
    {
        return $item->getId();
    }

    public function getProductId($item)
    {
        return $item->getId();
    }
}