gridstate.php

См. документацию.

<?php
 
namespace Bitrix\Catalog\Component\GridVariation;

class GridState
{
    private string $gridId;
    private int $productId;
    private int $currentPage;

    public function __construct(int $productId, string $gridId)
    {
        $this->productId = $productId;
        $this->gridId = $gridId;
    }

    public function getProductId(): int
    {
        return $this->productId;
    }

    public function getGridId(): string
    {
        return $this->gridId;
    }

    public function getCurrentPage(): int
    {
        return $this->currentPage ?? 1;
    }

    public function setCurrentPage(int $page): void
    {
        $this->currentPage = $page;
    }

    public function reset(): void
    {
        $this->currentPage = 1;
    }

    public function save(): void
    {
        (new GridStateStorage)->save($this);
    }
}