spqr/vendor/jasongrimes/paginator/src/JasonGrimes/Paginator.php
2024-11-05 12:10:06 +08:00

346 lines
8.5 KiB
PHP

<?php
namespace JasonGrimes;
class Paginator
{
const NUM_PLACEHOLDER = '(:num)';
protected $totalItems;
protected $numPages;
protected $itemsPerPage;
protected $currentPage;
protected $urlPattern;
protected $maxPagesToShow = 10;
protected $previousText = 'Previous';
protected $nextText = 'Next';
/**
* @param int $totalItems The total number of items.
* @param int $itemsPerPage The number of items per page.
* @param int $currentPage The current page number.
* @param string $urlPattern A URL for each page, with (:num) as a placeholder for the page number. Ex. '/foo/page/(:num)'
*/
public function __construct($totalItems, $itemsPerPage, $currentPage, $urlPattern = '')
{
$this->totalItems = $totalItems;
$this->itemsPerPage = $itemsPerPage;
$this->currentPage = $currentPage;
$this->urlPattern = $urlPattern;
$this->updateNumPages();
}
protected function updateNumPages()
{
$this->numPages = ($this->itemsPerPage == 0 ? 0 : (int) ceil($this->totalItems/$this->itemsPerPage));
}
/**
* @param int $maxPagesToShow
* @throws \InvalidArgumentException if $maxPagesToShow is less than 3.
*/
public function setMaxPagesToShow($maxPagesToShow)
{
if ($maxPagesToShow < 3) {
throw new \InvalidArgumentException('maxPagesToShow cannot be less than 3.');
}
$this->maxPagesToShow = $maxPagesToShow;
}
/**
* @return int
*/
public function getMaxPagesToShow()
{
return $this->maxPagesToShow;
}
/**
* @param int $currentPage
*/
public function setCurrentPage($currentPage)
{
$this->currentPage = $currentPage;
}
/**
* @return int
*/
public function getCurrentPage()
{
return $this->currentPage;
}
/**
* @param int $itemsPerPage
*/
public function setItemsPerPage($itemsPerPage)
{
$this->itemsPerPage = $itemsPerPage;
$this->updateNumPages();
}
/**
* @return int
*/
public function getItemsPerPage()
{
return $this->itemsPerPage;
}
/**
* @param int $totalItems
*/
public function setTotalItems($totalItems)
{
$this->totalItems = $totalItems;
$this->updateNumPages();
}
/**
* @return int
*/
public function getTotalItems()
{
return $this->totalItems;
}
/**
* @return int
*/
public function getNumPages()
{
return $this->numPages;
}
/**
* @param string $urlPattern
*/
public function setUrlPattern($urlPattern)
{
$this->urlPattern = $urlPattern;
}
/**
* @return string
*/
public function getUrlPattern()
{
return $this->urlPattern;
}
/**
* @param int $pageNum
* @return string
*/
public function getPageUrl($pageNum)
{
return str_replace(self::NUM_PLACEHOLDER, $pageNum, $this->urlPattern);
}
public function getNextPage()
{
if ($this->currentPage < $this->numPages) {
return $this->currentPage + 1;
}
return null;
}
public function getPrevPage()
{
if ($this->currentPage > 1) {
return $this->currentPage - 1;
}
return null;
}
public function getNextUrl()
{
if (!$this->getNextPage()) {
return null;
}
return $this->getPageUrl($this->getNextPage());
}
/**
* @return string|null
*/
public function getPrevUrl()
{
if (!$this->getPrevPage()) {
return null;
}
return $this->getPageUrl($this->getPrevPage());
}
/**
* Get an array of paginated page data.
*
* Example:
* array(
* array ('num' => 1, 'url' => '/example/page/1', 'isCurrent' => false),
* array ('num' => '...', 'url' => NULL, 'isCurrent' => false),
* array ('num' => 3, 'url' => '/example/page/3', 'isCurrent' => false),
* array ('num' => 4, 'url' => '/example/page/4', 'isCurrent' => true ),
* array ('num' => 5, 'url' => '/example/page/5', 'isCurrent' => false),
* array ('num' => '...', 'url' => NULL, 'isCurrent' => false),
* array ('num' => 10, 'url' => '/example/page/10', 'isCurrent' => false),
* )
*
* @return array
*/
public function getPages()
{
$pages = array();
if ($this->numPages <= 1) {
return array();
}
if ($this->numPages <= $this->maxPagesToShow) {
for ($i = 1; $i <= $this->numPages; $i++) {
$pages[] = $this->createPage($i, $i == $this->currentPage);
}
} else {
// Determine the sliding range, centered around the current page.
$numAdjacents = (int) floor(($this->maxPagesToShow - 3) / 2);
if ($this->currentPage + $numAdjacents > $this->numPages) {
$slidingStart = $this->numPages - $this->maxPagesToShow + 2;
} else {
$slidingStart = $this->currentPage - $numAdjacents;
}
if ($slidingStart < 2) $slidingStart = 2;
$slidingEnd = $slidingStart + $this->maxPagesToShow - 3;
if ($slidingEnd >= $this->numPages) $slidingEnd = $this->numPages - 1;
// Build the list of pages.
$pages[] = $this->createPage(1, $this->currentPage == 1);
if ($slidingStart > 2) {
$pages[] = $this->createPageEllipsis();
}
for ($i = $slidingStart; $i <= $slidingEnd; $i++) {
$pages[] = $this->createPage($i, $i == $this->currentPage);
}
if ($slidingEnd < $this->numPages - 1) {
$pages[] = $this->createPageEllipsis();
}
$pages[] = $this->createPage($this->numPages, $this->currentPage == $this->numPages);
}
return $pages;
}
/**
* Create a page data structure.
*
* @param int $pageNum
* @param bool $isCurrent
* @return Array
*/
protected function createPage($pageNum, $isCurrent = false)
{
return array(
'num' => $pageNum,
'url' => $this->getPageUrl($pageNum),
'isCurrent' => $isCurrent,
);
}
/**
* @return array
*/
protected function createPageEllipsis()
{
return array(
'num' => '...',
'url' => null,
'isCurrent' => false,
);
}
/**
* Render an HTML pagination control.
*
* @return string
*/
public function toHtml()
{
if ($this->numPages <= 1) {
return '';
}
$html = '<ul class="pagination">';
if ($this->getPrevUrl()) {
$html .= '<li><a href="' . htmlspecialchars($this->getPrevUrl()) . '">&laquo; '. $this->previousText .'</a></li>';
}
foreach ($this->getPages() as $page) {
if ($page['url']) {
$html .= '<li' . ($page['isCurrent'] ? ' class="active"' : '') . '><a href="' . htmlspecialchars($page['url']) . '">' . htmlspecialchars($page['num']) . '</a></li>';
} else {
$html .= '<li class="disabled"><span>' . htmlspecialchars($page['num']) . '</span></li>';
}
}
if ($this->getNextUrl()) {
$html .= '<li><a href="' . htmlspecialchars($this->getNextUrl()) . '">'. $this->nextText .' &raquo;</a></li>';
}
$html .= '</ul>';
return $html;
}
public function __toString()
{
return $this->toHtml();
}
public function getCurrentPageFirstItem()
{
$first = ($this->currentPage - 1) * $this->itemsPerPage + 1;
if ($first > $this->totalItems) {
return null;
}
return $first;
}
public function getCurrentPageLastItem()
{
$first = $this->getCurrentPageFirstItem();
if ($first === null) {
return null;
}
$last = $first + $this->itemsPerPage - 1;
if ($last > $this->totalItems) {
return $this->totalItems;
}
return $last;
}
public function setPreviousText($text)
{
$this->previousText = $text;
return $this;
}
public function setNextText($text)
{
$this->nextText = $text;
return $this;
}
}