paginationaction.php

См. документацию.

<?php
 
namespace Bitrix\Main\Grid\Action;
 
use Bitrix\Main\Grid\Pagination\PageNavigationStorage;
use Bitrix\Main\HttpRequest;
use Bitrix\Main\Result;
use Bitrix\Main\UI\PageNavigation;

final class PaginationAction implements Action
{
    private PageNavigation $pagination;
    private ?PageNavigationStorage $storage;

    public static function getId(): string
    {
        return 'pagination';
    }

    public function __construct(PageNavigation $pagination, ?PageNavigationStorage $storage)
    {
        $this->pagination = $pagination;
        $this->storage = $storage;
    }

    public function processRequest(HttpRequest $request): ?Result
    {
        if (\Bitrix\Main\Context::getCurrent()->getRequest() !== $request)
        {
            trigger_error('Pagination working only request from context', E_USER_WARNING);
        }
 
        $tmp = clone $this->pagination;
        $tmp->setCurrentPage(1);
        $tmp->initFromUri();
 
        if ($this->pagination->getCurrentPage() !== $tmp->getCurrentPage())
        {
            $this->pagination->setCurrentPage($tmp->getCurrentPage());
 
            if (isset($this->storage))
            {
                $this->storage->save($this->pagination);
            }
        }
 
        return new Result();
    }
}