lazyloadtotalcount.php

См. документацию.

<?php
 
namespace Bitrix\Main\Grid\Pagination;
 
use Bitrix\Main\Grid\Action\CalculateTotalCountAction;
use Bitrix\Main\UI\PageNavigation;
use Closure;
 
trait LazyLoadTotalCount
{
    private ?Closure $totalCountCalculator = null;

    abstract public function getId(): string;
 

    public function setTotalCountCalculator(Closure $value): void
    {
        $this->totalCountCalculator = $value;
    }
 
    private function getCalculateTotalCountAction(PageNavigation $pagination): CalculateTotalCountAction
    {
        return new CalculateTotalCountAction($this->totalCountCalculator, $pagination);
    }

    public function getTotalRowsCountHtml(): string
    {
        return '<lazy-load-total-count grid-id="' . htmlspecialcharsbx($this->getId()) . '" />';
    }
 
    public function setRawRowsWithLazyLoadPagination(Closure $getRawRowsCallback): void
    {
        $params = $this->getOrmParams();
        $pagination = $this->getPagination();
 
        if (empty($pagination) || empty($params['limit']))
        {
            $this->setRawRows(
                $getRawRowsCallback($params)
            );
 
            return;
        }
 
        $params['limit']++;
        $rows = [];
        $rowsCount = 0;
 
        foreach ($getRawRowsCallback($params) as $row)
        {
            $rowsCount++;
            if ($rowsCount > $pagination->getPageSize())
            {
                break;
            }
 
            $rows[] = $row;
        }
 
        $rowsCount += $params['offset'] ?? 0;
        $pagination->setRecordCount($rowsCount);
 
        $this->setRawRows($rows);
    }
 
    protected function getActions(): array
    {
        $actions = parent::getActions();
        $actions[] = $this->getCalculateTotalCountAction($this->getPagination());
 
        return $actions;
    }
}