Viewed.php

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<?php
namespace Magento\Reports\Block\Product;

use \Magento\Framework\DataObject\IdentityInterface;

class Viewed extends AbstractProduct implements IdentityInterface
{
    const XML_PATH_RECENTLY_VIEWED_COUNT = 'catalog/recently_products/viewed_count';

    protected $_indexType = \Magento\Reports\Model\Product\Index\Factory::TYPE_VIEWED;

    public function getPageSize()
    {
        if ($this->hasData('page_size')) {
            return $this->getData('page_size');
        }
        return $this->_scopeConfig->getValue(
            self::XML_PATH_RECENTLY_VIEWED_COUNT,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
    }

    public function getCount()
    {
        $ids = $this->getProductIds();
        if (!empty($ids)) {
            return count($ids);
        }
        return parent::getCount();
    }

    protected function _toHtml()
    {
        $this->setRecentlyViewedProducts($this->getItemsCollection());
        return parent::_toHtml();
    }

    public function getIdentities()
    {
        $identities = [];
        foreach ($this->getItemsCollection() as $item) {
            $identities = array_merge($identities, $item->getIdentities());
        }
        return $identities;
    }
}