UnreadMessagePopup.php

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<?php
namespace Magento\AdminNotification\Block\System\Messages;

use Magento\Framework\Notification\MessageInterface;

class UnreadMessagePopup extends \Magento\Backend\Block\Template
{
    protected $_itemClasses = [
        MessageInterface::SEVERITY_CRITICAL => 'error',
        MessageInterface::SEVERITY_MAJOR => 'warning',
    ];

    protected $_messages;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\AdminNotification\Model\ResourceModel\System\Message\Collection\Synchronized $messages,
        array $data = []
    ) {
        parent::__construct($context, $data);
        $this->_messages = $messages;
    }

    protected function _toHtml()
    {
        if (count($this->_messages->getUnread())) {
            return parent::_toHtml();
        }
        return '';
    }

    public function getUnreadMessages()
    {
        return $this->_messages->getUnread();
    }

    public function getPopupTitle()
    {
        $messageCount = count($this->_messages->getUnread());
        if ($messageCount > 1) {
            return __('You have %1 new system messages', $messageCount);
        }
        return __('You have %1 new system message', $messageCount);
    }

    public function getItemClass(MessageInterface $message)
    {
        return $this->_itemClasses[$message->getSeverity()];
    }
}