Crosssell.php

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<?php
namespace Magento\Checkout\Block\Cart;

use Magento\CatalogInventory\Helper\Stock as StockHelper;

class Crosssell extends \Magento\Catalog\Block\Product\AbstractProduct
{
    protected $_maxItemCount = 4;

    protected $_checkoutSession;

    protected $_productVisibility;

    protected $stockHelper;

    protected $_productLinkFactory;

    protected $_itemRelationsList;

    public function __construct(
        \Magento\Catalog\Block\Product\Context $context,
        \Magento\Checkout\Model\Session $checkoutSession,
        \Magento\Catalog\Model\Product\Visibility $productVisibility,
        \Magento\Catalog\Model\Product\LinkFactory $productLinkFactory,
        \Magento\Quote\Model\Quote\Item\RelatedProducts $itemRelationsList,
        StockHelper $stockHelper,
        array $data = []
    ) {
        $this->_checkoutSession = $checkoutSession;
        $this->_productVisibility = $productVisibility;
        $this->_productLinkFactory = $productLinkFactory;
        $this->_itemRelationsList = $itemRelationsList;
        $this->stockHelper = $stockHelper;
        parent::__construct(
            $context,
            $data
        );
        $this->_isScopePrivate = true;
    }

    public function getItems()
    {
        $items = $this->getData('items');
        if ($items === null) {
            $items = [];
            $ninProductIds = $this->_getCartProductIds();
            if ($ninProductIds) {
                $lastAdded = (int)$this->_getLastAddedProductId();
                if ($lastAdded) {
                    $collection = $this->_getCollection()->addProductFilter($lastAdded);
                    if (!empty($ninProductIds)) {
                        $collection->addExcludeProductFilter($ninProductIds);
                    }
                    $collection->setPositionOrder()->load();

                    foreach ($collection as $item) {
                        $ninProductIds[] = $item->getId();
                        $items[] = $item;
                    }
                }

                if (count($items) < $this->_maxItemCount) {
                    $filterProductIds = array_merge(
                        $this->_getCartProductIds(),
                        $this->_itemRelationsList->getRelatedProductIds($this->getQuote()->getAllItems())
                    );
                    $collection = $this->_getCollection()->addProductFilter(
                        $filterProductIds
                    )->addExcludeProductFilter(
                        $ninProductIds
                    )->setPageSize(
                        $this->_maxItemCount - count($items)
                    )->setGroupBy()->setPositionOrder()->load();
                    foreach ($collection as $item) {
                        $items[] = $item;
                    }
                }
            }

            $this->setData('items', $items);
        }
        return $items;
    }

    public function getItemCount()
    {
        return count($this->getItems());
    }

    protected function _getCartProductIds()
    {
        $ids = $this->getData('_cart_product_ids');
        if ($ids === null) {
            $ids = [];
            foreach ($this->getQuote()->getAllItems() as $item) {
                $product = $item->getProduct();
                if ($product) {
                    $ids[] = $product->getId();
                }
            }
            $this->setData('_cart_product_ids', $ids);
        }
        return $ids;
    }

    protected function _getLastAddedProductId()
    {
        return $this->_checkoutSession->getLastAddedProductId(true);
    }

    public function getQuote()
    {
        return $this->_checkoutSession->getQuote();
    }

    protected function _getCollection()
    {
        $collection = $this->_productLinkFactory->create()->useCrossSellLinks()->getProductCollection()->setStoreId(
            $this->_storeManager->getStore()->getId()
        )->addStoreFilter()->setPageSize(
            $this->_maxItemCount
        )->setVisibility(
            $this->_productVisibility->getVisibleInCatalogIds()
        );
        $this->_addProductAttributesAndPrices($collection);

        return $collection;
    }
}