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<?php |
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namespace Zenstruck\Porpaginas; |
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/** |
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* @author Kevin Bond <[email protected]> |
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*/ |
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final class Pager implements \Countable, \IteratorAggregate |
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{ |
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public const DEFAULT_LIMIT = 20; |
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private Result $result; |
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private int $page; |
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private int $limit; |
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private ?Page $cachedPage = null; |
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public function __construct(Result $result, int $page = 1, int $limit = self::DEFAULT_LIMIT) |
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{ |
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$this->result = $result; |
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$this->page = $page < 1 ? 1 : $page; |
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$this->limit = $limit < 1 ? self::DEFAULT_LIMIT : $limit; |
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} |
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public function current(): int |
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{ |
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$lastPage = $this->last(); |
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if ($this->page > $lastPage) { |
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return $lastPage; |
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} |
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return $this->page; |
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} |
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public function limit(): int |
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{ |
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return $this->limit; |
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} |
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/** |
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* @return int the count for the current page |
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*/ |
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public function count(): int |
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{ |
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return $this->getPage()->count(); |
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} |
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public function totalCount(): int |
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{ |
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return $this->result->count(); |
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} |
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public function getIterator(): \Traversable |
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{ |
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return $this->getPage()->getIterator(); |
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} |
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public function next(): ?int |
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{ |
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$currentPage = $this->current(); |
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if ($currentPage === $this->last()) { |
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return null; |
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} |
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return ++$currentPage; |
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} |
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public function previous(): ?int |
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{ |
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$page = $this->current(); |
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if (1 === $page) { |
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return null; |
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} |
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return --$page; |
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} |
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public function first(): int |
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{ |
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return 1; |
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} |
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public function last(): int |
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{ |
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$totalCount = $this->totalCount(); |
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if (0 === $totalCount) { |
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return 1; |
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} |
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return \ceil($totalCount / $this->limit()); |
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} |
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public function pageCount(): int |
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{ |
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return $this->last(); |
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} |
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public function haveToPaginate(): bool |
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{ |
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return $this->pageCount() > 1; |
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} |
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private function getPage(): Page |
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{ |
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if ($this->cachedPage) { |
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return $this->cachedPage; |
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} |
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$offset = $this->current() * $this->limit() - $this->limit(); |
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return $this->cachedPage = $this->result->take($offset, $this->limit()); |
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} |
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} |
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kbond /
porpaginas
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