SetGoogleAnalyticsOnOrderSuccessPageViewObserver.php

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<?php
namespace Magento\GoogleAnalytics\Observer;

use Magento\Framework\Event\Observer as EventObserver;
use Magento\Framework\Event\ObserverInterface;

class SetGoogleAnalyticsOnOrderSuccessPageViewObserver implements ObserverInterface
{
    protected $_googleAnalyticsData = null;

    protected $_layout;

    protected $_storeManager;

    public function __construct(
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Framework\View\LayoutInterface $layout,
        \Magento\GoogleAnalytics\Helper\Data $googleAnalyticsData
    ) {
        $this->_googleAnalyticsData = $googleAnalyticsData;
        $this->_layout = $layout;
        $this->_storeManager = $storeManager;
    }

    public function execute(EventObserver $observer)
    {
        $orderIds = $observer->getEvent()->getOrderIds();
        if (empty($orderIds) || !is_array($orderIds)) {
            return;
        }
        $block = $this->_layout->getBlock('google_analytics');
        if ($block) {
            $block->setOrderIds($orderIds);
        }
    }
}