Bar.php

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<?php
namespace Magento\Backend\Block\Dashboard;

class Bar extends \Magento\Backend\Block\Dashboard\AbstractDashboard
{
    protected $_totals = [];

    protected $_currentCurrencyCode = null;

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

    public function addTotal($label, $value, $isQuantity = false)
    {
        if (!$isQuantity) {
            $value = $this->format($value);
        }
        $decimals = '';
        $this->_totals[] = ['label' => $label, 'value' => $value, 'decimals' => $decimals];

        return $this;
    }

    public function format($price)
    {
        return $this->getCurrency()->format($price);
    }

    public function setCurrency($currency)
    {
        $this->_currency = $currency;
    }

    public function getCurrency()
    {
        if ($this->_currentCurrencyCode === null) {
            if ($this->getRequest()->getParam('store')) {
                $this->_currentCurrencyCode = $this->_storeManager->getStore(
                    $this->getRequest()->getParam('store')
                )->getBaseCurrency();
            } elseif ($this->getRequest()->getParam('website')) {
                $this->_currentCurrencyCode = $this->_storeManager->getWebsite(
                    $this->getRequest()->getParam('website')
                )->getBaseCurrency();
            } elseif ($this->getRequest()->getParam('group')) {
                $this->_currentCurrencyCode = $this->_storeManager->getGroup(
                    $this->getRequest()->getParam('group')
                )->getWebsite()->getBaseCurrency();
            } else {
                $this->_currentCurrencyCode = $this->_storeManager->getStore()->getBaseCurrency();
            }
        }

        return $this->_currentCurrencyCode;
    }
}