listaction.php

См. документацию.

<?php
 
namespace Bitrix\Catalog\Controller;
 
use Bitrix\Main\Engine\Response\DataType\Page;
use Bitrix\Main\UI\PageNavigation;
 
trait ListAction
{
    abstract protected function getServiceListName(): string;
 
    abstract protected function getList(
        array $select,
        array $filter,
        array $order,
        PageNavigation $pageNavigation = null
    ): array;
 
    abstract protected function count($filter);

    public function listAction(
        PageNavigation $pageNavigation,
        array $select = [],
        array $filter = [],
        array $order = [],
        bool $__calculateTotalCount = true
    ): Page
    {
        $params = $this->modifyListActionParameters([
            'select' => $select,
            'filter' => $filter,
            'order' => $order,
        ]);
 
        return new Page(
            $this->getServiceListName(),
            $this->getList($params['select'], $params['filter'], $params['order'], $pageNavigation),
            $__calculateTotalCount ? $this->count($filter) : 0
        );
    }

    protected function modifyListActionParameters(array $params): array
    {
        return $params;
    }
}