Items.php

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

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

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Framework\Registry $registry,
        array $data = []
    ) {
        $this->_coreRegistry = $registry;
        parent::__construct($context, $data);
    }

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

    public function getPrintInvoiceUrl($invoice)
    {
        return $this->getUrl('*/*/printInvoice', ['invoice_id' => $invoice->getId()]);
    }

    public function getPrintAllInvoicesUrl($order)
    {
        return $this->getUrl('*/*/printInvoice', ['order_id' => $order->getId()]);
    }

    public function getInvoiceTotalsHtml($invoice)
    {
        $html = '';
        $totals = $this->getChildBlock('invoice_totals');
        if ($totals) {
            $totals->setInvoice($invoice);
            $html = $totals->toHtml();
        }
        return $html;
    }

    public function getInvoiceCommentsHtml($invoice)
    {
        $html = '';
        $comments = $this->getChildBlock('invoice_comments');
        if ($comments) {
            $comments->setEntity($invoice)->setTitle(__('About Your Invoice'));
            $html = $comments->toHtml();
        }
        return $html;
    }
}