Totalbar.php

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

class Totalbar extends \Magento\Sales\Block\Adminhtml\Order\AbstractOrder
{
    protected $_totals = [];

    protected function _beforeToHtml()
    {
        if (!$this->getParentBlock()) {
            throw new \Magento\Framework\Exception\LocalizedException(
                __('Please correct the parent block for this block.')
            );
        }
        $this->setOrder($this->getParentBlock()->getOrder());
        $this->setSource($this->getParentBlock()->getSource());
        $this->setCurrency($this->getParentBlock()->getOrder()->getOrderCurrency());

        foreach ($this->getParentBlock()->getOrderTotalbarData() as $v) {
            $this->addTotal($v[0], $v[1], $v[2]);
        }

        parent::_beforeToHtml();
    }

    protected function getTotals()
    {
        return $this->_totals;
    }

    public function addTotal($label, $value, $grand = false)
    {
        $this->_totals[] = ['label' => $label, 'value' => $value, 'grand' => $grand];
        return $this;
    }
}