Invoice.php

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

use Magento\Customer\Model\Context;

class Invoice extends \Magento\Sales\Block\Order\Invoice\Items
{
    protected $_template = 'Magento_Sales::order/invoice.phtml';

    protected $httpContext;

    protected $_paymentHelper;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\App\Http\Context $httpContext,
        \Magento\Payment\Helper\Data $paymentHelper,
        array $data = []
    ) {
        $this->_paymentHelper = $paymentHelper;
        $this->httpContext = $httpContext;
        parent::__construct($context, $registry, $data);
        $this->_isScopePrivate = true;
    }

    protected function _prepareLayout()
    {
        $this->pageConfig->getTitle()->set(__('Order # %1', $this->getOrder()->getRealOrderId()));
        $infoBlock = $this->_paymentHelper->getInfoBlock($this->getOrder()->getPayment(), $this->getLayout());
        $this->setChild('payment_info', $infoBlock);
    }

    public function getPaymentInfoHtml()
    {
        return $this->getChildHtml('payment_info');
    }

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

    public function getBackUrl()
    {
        if ($this->httpContext->getValue(Context::CONTEXT_AUTH)) {
            return $this->getUrl('*/*/history');
        }
        return $this->getUrl('*/*/form');
    }

    public function getBackTitle()
    {
        if ($this->httpContext->getValue(Context::CONTEXT_AUTH)) {
            return __('Back to My Orders');
        }
        return __('View Another Order');
    }

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

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

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

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

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