sessionpagenavigationstorage.php

<?php
 
namespace Bitrix\Main\Grid\Pagination\Storage;
 
use Bitrix\Main\Application;
use Bitrix\Main\Data\LocalStorage\SessionLocalStorage;
use Bitrix\Main\Grid\Pagination\PageNavigationStorage;
use Bitrix\Main\UI\PageNavigation;
 
final class SessionPageNavigationStorage implements PageNavigationStorage
{
    private const STORAGE_ID = 'grid-pagination-storage';
    private SessionLocalStorage $storage;
 
    public function __construct(?SessionLocalStorage $storage = null)
    {
        $this->storage =
            $storage
            ?? Application::getInstance()->getSessionLocalStorageManager()->get(self::STORAGE_ID)
        ;
    }
 
    public function fill(PageNavigation $pagination): void
    {
        $data = $this->storage->get($pagination->getId());
        if (is_array($data) && isset($data['current']))
        {
            $pagination->setCurrentPage((int)$data['current']);
        }
    }
 
    public function save(PageNavigation $pagination): void
    {
        $this->storage->set(
            $pagination->getId(),
            [
                'current' => $pagination->getCurrentPage(),
            ]
        );
    }
}