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<?php |
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namespace Tuum\Pagination\Paginate; |
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use Tuum\Pagination\Inputs; |
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class Paginate implements \IteratorAggregate, PaginateInterface |
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{ |
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/** |
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* @var int |
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*/ |
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protected $currPage; |
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/** |
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* @var int |
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*/ |
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private $firstPage; |
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/** |
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* @var int |
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*/ |
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private $lastPage; |
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/** |
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* @var string |
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*/ |
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private $pagerKey = '_page'; |
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/** |
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* @var int |
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*/ |
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public $numLinks = 5; |
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/** |
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* Paginate constructor. |
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* |
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* @param int $currPage |
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* @param int $lastPage |
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* @param string $pagerKey |
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* @param int $firstPage |
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*/ |
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public function __construct($currPage, $lastPage, $pagerKey = '', $firstPage = 1) |
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{ |
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$this->currPage = $currPage; |
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$this->firstPage = $firstPage; |
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$this->lastPage = $lastPage; |
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$this->pagerKey = $pagerKey ?: $this->pagerKey; |
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} |
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/** |
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* @param Inputs $inputs |
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* @return Paginate |
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*/ |
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public static function forge(Inputs $inputs) |
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{ |
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$self = new self( |
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$inputs->getPage(), |
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$inputs->calcLastPage(), |
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$inputs->pagerKey, |
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$inputs->calcFirstPage() |
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); |
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return $self; |
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} |
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/** |
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* @param Inputs $inputs |
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* @return Paginate |
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*/ |
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public function setInputs(Inputs $inputs) |
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{ |
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$this->currPage = $inputs->getPage(); |
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$this->firstPage = $inputs->calcFirstPage(); |
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$this->lastPage = $inputs->calcLastPage(); |
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$this->pagerKey = $inputs->pagerKey; |
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return $this; |
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} |
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/** |
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* @return Page[]|\Iterator |
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*/ |
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public function getIterator() |
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{ |
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$pages = $this->calcPageList(); |
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foreach($pages as $p) { |
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yield $p; |
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} |
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} |
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/** |
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* @return Page[] |
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*/ |
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private function calcPageList() |
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{ |
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$start = $this->calcStart(); |
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$last = $this->calcLast(); |
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$pages = []; |
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if ($p = $this->getExtraStart()) { |
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$pages[] = $p; |
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} |
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for ($p = $start; $p <= $last; $p++) { |
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$pages[$p] = $this->forgePage($p); |
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} |
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if ($p = $this->getExtraLast()) { |
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$pages[] = $p; |
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} |
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return $pages; |
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} |
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/** |
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* @return int |
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*/ |
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private function calcStart() |
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{ |
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$half = (int) ($this->numLinks / 2); |
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$start = max($this->currPage - $half, $this->firstPage + 1); |
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$maybe = max($this->lastPage - 1 - $this->numLinks, $this->firstPage + 1); |
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$start = min($start, $maybe); |
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return $start; |
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} |
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/** |
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* @return bool|Page |
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*/ |
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private function getExtraStart() |
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{ |
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$start = $this->calcStart(); |
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if ($start < $this->firstPage + 2) { |
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return false; |
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} |
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if ($start === $this->firstPage + 2) { |
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return $this->forgePage(2); |
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} |
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return $this->forgePage(null); |
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} |
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/** |
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* @return int |
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*/ |
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private function calcLast() |
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{ |
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$numLinks = $this->numLinks - 1 + ($this->getExtraStart() ? 0: 1); |
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$last = min($this->calcStart() + $numLinks, $this->lastPage - 1); |
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return $last; |
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} |
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private function getExtraLast() |
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{ |
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$last = $this->calcLast(); |
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if ($last > $this->lastPage - 2) { |
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return false; |
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} |
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if ($last === $this->lastPage - 2) { |
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return $this->forgePage($this->lastPage - 1); |
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} |
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return $this->forgePage(null); |
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} |
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/** |
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* @param int $page |
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* @return Page |
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*/ |
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private function forgePage($page) |
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{ |
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return new Page($this->pagerKey, $this->currPage, $page); |
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} |
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/** |
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* @return Page |
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*/ |
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public function getFirstPage() |
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{ |
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return $this->forgePage($this->firstPage); |
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} |
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/** |
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* @return Page |
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*/ |
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public function getLastPage() |
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{ |
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return $this->forgePage($this->lastPage); |
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} |
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/** |
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* @return Page |
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*/ |
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public function getNextPage() |
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{ |
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$page = min($this->currPage + 1, $this->lastPage); |
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return $this->forgePage($page); |
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} |
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/** |
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* @return Page |
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*/ |
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public function getPrevPage() |
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{ |
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$page = max($this->currPage - 1, $this->firstPage); |
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return $this->forgePage($page); |
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} |
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} |
TuumPHP /
Pagination
