Items.php

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<?php
namespace Magento\Sales\Block\Order;

class Items extends \Magento\Sales\Block\Items\AbstractItems
{
    protected $_coreRegistry = null;

    private $itemsPerPage;

    private $itemCollectionFactory;

    private $itemCollection;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Framework\Registry $registry,
        array $data = [],
        \Magento\Sales\Model\ResourceModel\Order\Item\CollectionFactory $itemCollectionFactory = null
    ) {
        $this->_coreRegistry = $registry;
        $this->itemCollectionFactory = $itemCollectionFactory ?: \Magento\Framework\App\ObjectManager::getInstance()
            ->get(\Magento\Sales\Model\ResourceModel\Order\Item\CollectionFactory::class);
        parent::__construct($context, $data);
    }

    protected function _prepareLayout()
    {
        $this->itemsPerPage = $this->_scopeConfig->getValue('sales/orders/items_per_page');

        $this->itemCollection = $this->itemCollectionFactory->create();
        $this->itemCollection->setOrderFilter($this->getOrder());
        $this->itemCollection->filterByParent(null);

        $pagerBlock = $this->getChildBlock('sales_order_item_pager');
        if ($pagerBlock) {
            $pagerBlock->setLimit($this->itemsPerPage);
            //here pager updates collection parameters
            $pagerBlock->setCollection($this->itemCollection);
            $pagerBlock->setAvailableLimit([$this->itemsPerPage]);
            $pagerBlock->setShowAmounts($this->isPagerDisplayed());
        }

        return parent::_prepareLayout();
    }

    public function isPagerDisplayed()
    {
        $pagerBlock = $this->getChildBlock('sales_order_item_pager');
        return $pagerBlock && ($this->itemCollection->getSize() > $this->itemsPerPage);
    }

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

    public function getPagerHtml()
    {
        $pagerBlock = $this->getChildBlock('sales_order_item_pager');
        return $pagerBlock ? $pagerBlock->toHtml() : '';
    }

    public function getOrder()
    {
        return $this->_coreRegistry->registry('current_order');
    }
}