events/Classes/Backports/V12/Pagination/SlidingWindowPagination.php

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<?php
declare(strict_types=1);
namespace Wrm\Events\Backports\V12\Pagination;
// Original source: https://github.com/TYPO3/typo3/blob/b60cf59fbe7875aff5ee1ba4c56155301694d6b8/typo3/sysext/core/Classes/Pagination/SlidingWindowPagination.php
// Remove once we have v12 as minimum version.
use TYPO3\CMS\Core\Pagination\PaginationInterface;
use TYPO3\CMS\Core\Pagination\PaginatorInterface;
/*
* This file is part of the TYPO3 CMS project.
*
* It is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, either version 2
* of the License, or any later version.
*
* For the full copyright and license information, please read the
* LICENSE.txt file that was distributed with this source code.
*
* The TYPO3 project - inspiring people to share!
*/
final class SlidingWindowPagination implements PaginationInterface
{
/**
* @var int
*/
protected $displayRangeStart = 0;
/**
* @var int
*/
protected $displayRangeEnd = 0;
/**
* @var bool
*/
protected $hasLessPages = false;
/**
* @var bool
*/
protected $hasMorePages = false;
/**
* @var int
*/
protected $maximumNumberOfLinks = 0;
/**
* @var PaginatorInterface
*/
protected $paginator;
public function __construct(PaginatorInterface $paginator, int $maximumNumberOfLinks = 0)
{
$this->paginator = $paginator;
if ($maximumNumberOfLinks > 0) {
$this->maximumNumberOfLinks = $maximumNumberOfLinks;
}
$this->calculateDisplayRange();
}
public function getPreviousPageNumber(): ?int
{
$previousPage = $this->paginator->getCurrentPageNumber() - 1;
if ($previousPage > $this->paginator->getNumberOfPages()) {
return null;
}
return $previousPage >= $this->getFirstPageNumber() ? $previousPage : null;
}
public function getNextPageNumber(): ?int
{
$nextPage = $this->paginator->getCurrentPageNumber() + 1;
return $nextPage <= $this->paginator->getNumberOfPages() ? $nextPage : null;
}
public function getFirstPageNumber(): int
{
return 1;
}
public function getLastPageNumber(): int
{
return $this->paginator->getNumberOfPages();
}
public function getStartRecordNumber(): int
{
if ($this->paginator->getCurrentPageNumber() > $this->paginator->getNumberOfPages()) {
return 0;
}
return $this->paginator->getKeyOfFirstPaginatedItem() + 1;
}
public function getEndRecordNumber(): int
{
if ($this->paginator->getCurrentPageNumber() > $this->paginator->getNumberOfPages()) {
return 0;
}
return $this->paginator->getKeyOfLastPaginatedItem() + 1;
}
public function getAllPageNumbers(): array
{
return range($this->displayRangeStart, $this->displayRangeEnd);
}
public function getDisplayRangeStart(): int
{
return $this->displayRangeStart;
}
public function getDisplayRangeEnd(): int
{
return $this->displayRangeEnd;
}
public function getHasLessPages(): bool
{
return $this->hasLessPages;
}
public function getHasMorePages(): bool
{
return $this->hasMorePages;
}
public function getMaximumNumberOfLinks(): int
{
return $this->maximumNumberOfLinks;
}
public function getPaginator(): PaginatorInterface
{
return $this->paginator;
}
protected function calculateDisplayRange(): void
{
$maximumNumberOfLinks = $this->maximumNumberOfLinks;
$numberOfPages = $this->paginator->getNumberOfPages();
if ($maximumNumberOfLinks > $numberOfPages) {
$maximumNumberOfLinks = $numberOfPages;
}
$currentPage = $this->paginator->getCurrentPageNumber();
$delta = floor($maximumNumberOfLinks / 2);
$this->displayRangeStart = (int)($currentPage - $delta);
$this->displayRangeEnd = (int)($currentPage + $delta - ($maximumNumberOfLinks % 2 === 0 ? 1 : 0));
if ($this->displayRangeStart < 1) {
$this->displayRangeEnd -= $this->displayRangeStart - 1;
}
if ($this->displayRangeEnd > $numberOfPages) {
$this->displayRangeStart -= $this->displayRangeEnd - $numberOfPages;
}
$this->displayRangeStart = (int)max($this->displayRangeStart, 1);
$this->displayRangeEnd = (int)min($this->displayRangeEnd, $numberOfPages);
$this->hasLessPages = $this->displayRangeStart > 2;
$this->hasMorePages = $this->displayRangeEnd + 1 < $this->paginator->getNumberOfPages();
}
}