Adjustments.php

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

use Magento\Framework\Pricing\PriceCurrencyInterface;

class Adjustments extends \Magento\Backend\Block\Template
{
    protected $_source;

    protected $_taxConfig;

    protected $priceCurrency;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Tax\Model\Config $taxConfig,
        PriceCurrencyInterface $priceCurrency,
        array $data = []
    ) {
        $this->_taxConfig = $taxConfig;
        $this->priceCurrency = $priceCurrency;
        parent::__construct($context, $data);
    }

    public function initTotals()
    {
        $parent = $this->getParentBlock();
        $this->_source = $parent->getSource();
        $total = new \Magento\Framework\DataObject(['code' => 'agjustments', 'block_name' => $this->getNameInLayout()]);
        $parent->removeTotal('shipping');
        $parent->removeTotal('adjustment_positive');
        $parent->removeTotal('adjustment_negative');
        $parent->addTotal($total);
        return $this;
    }

    public function getSource()
    {
        return $this->_source;
    }

    public function getShippingAmount()
    {
        $source = $this->getSource();
        if ($this->_taxConfig->displaySalesShippingInclTax($source->getOrder()->getStoreId())) {
            $shipping = $source->getBaseShippingInclTax();
        } else {
            $shipping = $source->getBaseShippingAmount();
        }
        return $this->priceCurrency->round($shipping) * 1;
    }

    public function getShippingLabel()
    {
        $source = $this->getSource();
        if ($this->_taxConfig->displaySalesShippingInclTax($source->getOrder()->getStoreId())) {
            $label = __('Refund Shipping (Incl. Tax)');
        } elseif ($this->_taxConfig->displaySalesShippingBoth($source->getOrder()->getStoreId())) {
            $label = __('Refund Shipping (Excl. Tax)');
        } else {
            $label = __('Refund Shipping');
        }
        return $label;
    }
}