Totals.php

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

use Magento\Sales\Model\Order\Creditmemo;

class Totals extends \Magento\Sales\Block\Order\Totals
{
    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Framework\Registry $registry,
        array $data = []
    ) {
        parent::__construct($context, $registry, $data);
        $this->_isScopePrivate = true;
    }

    protected $_creditmemo = null;

    public function getCreditmemo()
    {
        if ($this->_creditmemo === null) {
            if ($this->hasData('creditmemo')) {
                $this->_creditmemo = $this->_getData('creditmemo');
            } elseif ($this->_coreRegistry->registry('current_creditmemo')) {
                $this->_creditmemo = $this->_coreRegistry->registry('current_creditmemo');
            } elseif ($this->getParentBlock()->getCreditmemo()) {
                $this->_creditmemo = $this->getParentBlock()->getCreditmemo();
            }
        }
        return $this->_creditmemo;
    }

    public function setCreditmemo($creditmemo)
    {
        $this->_creditmemo = $creditmemo;
        return $this;
    }

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

    protected function _initTotals()
    {
        parent::_initTotals();
        $this->removeTotal('base_grandtotal');
        if ((double)$this->getSource()->getAdjustmentPositive()) {
            $total = new \Magento\Framework\DataObject(
                [
                    'code' => 'adjustment_positive',
                    'value' => $this->getSource()->getAdjustmentPositive(),
                    'label' => __('Adjustment Refund'),
                ]
            );
            $this->addTotal($total);
        }
        if ((double)$this->getSource()->getAdjustmentNegative()) {
            $total = new \Magento\Framework\DataObject(
                [
                    'code' => 'adjustment_negative',
                    'value' => $this->getSource()->getAdjustmentNegative(),
                    'label' => __('Adjustment Fee'),
                ]
            );
            $this->addTotal($total);
        }
        return $this;
    }
}