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<?php |
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namespace Jidaikobo\Kontiki\Utils; |
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/** |
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* Pagination class to handle pagination logic for SQL queries. |
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* |
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* This class provides methods to calculate LIMIT and OFFSET for pagination, as well as helper |
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* methods to determine the existence of next and previous pages. |
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*/ |
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class Pagination |
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{ |
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/** @var int Current page number */ |
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protected int $currentPage; |
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/** @var int Number of items per page */ |
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protected int $itemsPerPage; |
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/** @var int Total number of items in the dataset */ |
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protected int $totalItems; |
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/** @var int Total number of pages calculated based on total items and items per page */ |
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protected int $totalPages; |
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/** |
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* Constructor to initialize pagination settings. |
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* |
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* @param int $currentPage The current page number. |
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* @param int $itemsPerPage The number of items to display per page. |
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*/ |
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public function __construct(int $currentPage = 1, int $itemsPerPage = 10) |
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{ |
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$this->currentPage = max(1, $currentPage); // Ensure current page is at least 1 |
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$this->itemsPerPage = max(1, $itemsPerPage); // Ensure items per page is at least 1 |
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} |
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/** |
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* Set the total number of items and calculate total pages. |
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* |
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* @param int $totalItems The total number of items. |
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*/ |
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public function setTotalItems(int $totalItems): void |
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{ |
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$this->totalItems = $totalItems; |
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$this->totalPages = (int) ceil($totalItems / $this->itemsPerPage); |
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} |
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/** |
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* Get the offset for SQL queries. |
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* |
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* @return int The calculated offset based on the current page and items per page. |
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*/ |
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public function getOffset(): int |
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{ |
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return ($this->currentPage - 1) * $this->itemsPerPage; |
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} |
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/** |
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* Get the limit for SQL queries. |
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* |
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* @return int The limit, or number of items per page. |
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*/ |
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public function getLimit(): int |
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{ |
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return $this->itemsPerPage; |
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} |
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public function getTotalItems(): int |
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{ |
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return $this->totalItems; |
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} |
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/** |
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* Check if there is a next page available. |
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* |
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* @return bool True if there is a next page, otherwise false. |
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*/ |
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public function hasNextPage(): bool |
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{ |
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return $this->currentPage < $this->totalPages; |
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} |
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/** |
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* Check if there is a previous page available. |
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* |
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* @return bool True if there is a previous page, otherwise false. |
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*/ |
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public function hasPreviousPage(): bool |
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{ |
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return $this->currentPage > 1; |
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} |
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/** |
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* Generate pagination links for navigation. |
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* |
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* @return array An array of page links with each link containing the page number and its current status. |
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*/ |
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public function getPageLinks(): array |
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{ |
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$links = []; |
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for ($i = 1; $i <= $this->totalPages; $i++) { |
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$links[] = [ |
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'page' => $i, |
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'isCurrent' => $i === $this->currentPage, |
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]; |
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} |
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return $links; |
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} |
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/** |
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* Get the current page number. |
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* |
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* @return int The current page number. |
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*/ |
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public function getCurrentPage(): int |
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{ |
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return $this->currentPage; |
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} |
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/** |
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* Render pagination links as HTML. |
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* |
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* @param string $baseUrl The base URL for pagination links. |
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* @param bool $isAjax Whether to add an AJAX-specific class to links. |
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* @return string The generated pagination HTML. |
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*/ |
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public function render(string $baseUrl, bool $isAjax = false): string |
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{ |
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$pageLinks = $this->getPageLinks(); |
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$ajaxClass = $isAjax ? ' page-link-ajax' : ''; |
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if (count($pageLinks) === 1) { |
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return ''; |
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} |
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$html = '<nav aria-label="Page navigation">'; |
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$html .= '<ul class="pagination">'; |
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$html .= $this->renderPreviousLink($baseUrl, $ajaxClass); |
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$html .= $this->renderPageLinks($baseUrl, $ajaxClass); |
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$html .= $this->renderNextLink($baseUrl, $ajaxClass); |
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$html .= '</ul>'; |
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$html .= '</nav>'; |
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return $html; |
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} |
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private function renderPreviousLink(string $baseUrl, string $ajaxClass): string |
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{ |
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if ($this->hasPreviousPage()) { |
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$previousPage = $this->currentPage - 1; |
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$html = ''; |
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$html .= '<li class="page-item">'; |
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$html .= '<a class="page-link' . $ajaxClass . '" href="' . $baseUrl . '?paged=' . $previousPage . '" aria-label="Previous" data-page="' . $previousPage . '">'; |
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$html .= '<span aria-hidden="true">«</span>'; |
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$html .= '</a></li>'; |
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return $html; |
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} |
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return '<li class="page-item disabled"><span class="page-link">«</span></li>'; |
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} |
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private function renderNextLink(string $baseUrl, string $ajaxClass): string |
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{ |
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if ($this->hasNextPage()) { |
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$html = ''; |
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$nextPage = $this->currentPage + 1; |
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$nextPage = $this->currentPage + 1; |
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$html .= '<li class="page-item">'; |
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$html .= '<a class="page-link' . $ajaxClass . '" href="' . $baseUrl . '?paged=' . $nextPage . '" aria-label="Next" data-page="' . $nextPage . '">'; |
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$html .= '<span aria-hidden="true">»</span>'; |
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$html .= '</a></li>'; |
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return $html; |
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} |
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return '<li class="page-item disabled"><span class="page-link">»</span></li>'; |
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} |
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private function renderPageLinks(string $baseUrl, string $ajaxClass): string |
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{ |
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$html = ''; |
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foreach ($this->getPageLinks() as $link) { |
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$eachPage = $link['page']; |
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$activeClass = $link['isCurrent'] ? ' active' : ''; |
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$ariaCurrent = $link['isCurrent'] ? ' aria-current="page"' : ''; |
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$html .= '<li class="page-item' . $activeClass . '">'; |
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$html .= '<a class="page-link' . $ajaxClass . '" href="' . $baseUrl . '?paged=' . $eachPage . '"' . $ariaCurrent . ' data-page="' . $eachPage . '">' . $eachPage . '</a>'; |
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$html .= '</li>'; |
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} |
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return $html; |
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} |
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} |
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