Sales.php

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

class Sales extends \Magento\Backend\Block\Dashboard\Bar
{
    protected $_template = 'Magento_Backend::dashboard/salebar.phtml';

    protected $_moduleManager;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Reports\Model\ResourceModel\Order\CollectionFactory $collectionFactory,
        \Magento\Framework\Module\Manager $moduleManager,
        array $data = []
    ) {
        $this->_moduleManager = $moduleManager;
        parent::__construct($context, $collectionFactory, $data);
    }

    protected function _prepareLayout()
    {
        if (!$this->_moduleManager->isEnabled('Magento_Reports')) {
            return $this;
        }
        $isFilter = $this->getRequest()->getParam(
            'store'
        ) || $this->getRequest()->getParam(
            'website'
        ) || $this->getRequest()->getParam(
            'group'
        );

        $collection = $this->_collectionFactory->create()->calculateSales($isFilter);

        if ($this->getRequest()->getParam('store')) {
            $collection->addFieldToFilter('store_id', $this->getRequest()->getParam('store'));
        } elseif ($this->getRequest()->getParam('website')) {
            $storeIds = $this->_storeManager->getWebsite($this->getRequest()->getParam('website'))->getStoreIds();
            $collection->addFieldToFilter('store_id', ['in' => $storeIds]);
        } elseif ($this->getRequest()->getParam('group')) {
            $storeIds = $this->_storeManager->getGroup($this->getRequest()->getParam('group'))->getStoreIds();
            $collection->addFieldToFilter('store_id', ['in' => $storeIds]);
        }

        $collection->load();
        $sales = $collection->getFirstItem();

        $this->addTotal(__('Lifetime Sales'), $sales->getLifetime());
        $this->addTotal(__('Average Order'), $sales->getAverage());
    }
}