Window.php

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<?php
namespace Magento\AdminNotification\Block;

class Window extends \Magento\Backend\Block\Template
{
    const XML_SEVERITY_ICONS_URL_PATH = 'system/adminnotification/severity_icons_url';

    protected $_severityIconsUrl;

    protected $_authSession;

    protected $_criticalCollection;

    protected $_latestItem;

    protected $_isScopePrivate;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Backend\Model\Auth\Session $authSession,
        \Magento\AdminNotification\Model\ResourceModel\Inbox\Collection\Critical $criticalCollection,
        array $data = []
    ) {
        parent::__construct($context, $data);
        $this->_authSession = $authSession;
        $this->_criticalCollection = $criticalCollection;
        $this->_isScopePrivate = true;
    }

    protected function _toHtml()
    {
        if ($this->canShow()) {
            $this->setHeaderText($this->escapeHtml(__('Incoming Message')));
            $this->setCloseText($this->escapeHtml(__('close')));
            $this->setReadDetailsText($this->escapeHtml(__('Read Details')));
            $this->setNoticeMessageText($this->escapeHtml($this->_getLatestItem()->getTitle()));
            $this->setNoticeMessageUrl($this->escapeUrl($this->_getLatestItem()->getUrl()));
            $this->setSeverityText('critical');
            return parent::_toHtml();
        }
        return '';
    }

    protected function _getLatestItem()
    {
        if ($this->_latestItem == null) {
            $items = array_values($this->_criticalCollection->getItems());
            $this->_latestItem = false;
            if (count($items)) {
                $this->_latestItem = $items[0];
            }
        }
        return $this->_latestItem;
    }

    public function canShow()
    {
        return $this->_authSession->isFirstPageAfterLogin() && $this->_getLatestItem();
    }
}