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<?php
/**
* Bitrix Framework
* @package bitrix
* @subpackage main
* @copyright 2001-2020 Bitrix
*/
namespace Bitrix\Main\UI;
class ReversePageNavigation extends PageNavigation
{
/**
* @param string $id Navigation identity like "nav-cars".
* @param int $count Record count.
*/
public function __construct($id, $count)
{
parent::__construct($id);
$this->setRecordCount($count);
}
/**
* Returns number of pages.
* @return int
*/
public function getPageCount()
{
if($this->allRecords)
{
return 1;
}
$maxPages = (int)floor($this->recordCount/$this->pageSize);
if($this->recordCount > 0 && $maxPages == 0)
{
$maxPages = 1;
}
return $maxPages;
}
/**
* Returns the current page number.
* @return int
*/
public function getCurrentPage()
{
if($this->currentPage !== null)
{
return $this->currentPage;
}
return $this->getPageCount();
}
/**
* Returns offset of the first record of the current page.
* @return int
*/
public function getOffset()
{
if($this->allRecords)
{
return 0;
}
$offset = 0;
$pageCount = $this->getPageCount();
$currentPage = $this->getCurrentPage();
if($currentPage <> $pageCount)
{
//counting the last page (wich is the first one on reverse paging)
$offset += ($this->recordCount % $this->pageSize);
}
$offset += ($pageCount - $currentPage) * $this->pageSize;
return $offset;
}
/**
* Returns the number of records in the current page.
* @return int
*/
public function getLimit()
{
if($this->allRecords)
{
return $this->getRecordCount();
}
if($this->getCurrentPage() == $this->getPageCount())
{
//the last page (displayed first)
return $this->pageSize + ($this->recordCount % $this->pageSize);
}
else
{
return $this->pageSize;
}
}
}