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<?php
namespace phinde;
/**
* A better result pager.
*
* Rules:
* - "Prev" and "next" buttons are outside
* - No "first" and "last", but "1" and "$totalNumOfPages"
* - two previous and two next pages are shown as buttons
* - When current page is <= 5, first 5 pages are shown
* - ".." is only shown for at least two skipped pages
*
* Examples:
* [<< prev] [1] [2] [3] [next >>]
* [<< prev] [1] [2] [3] [4] [5] [next >>]
* [<< prev] [1] [2] [3] [4] [5] ... [8] [next >>]
* [<< prev] [1] ... [4] [5] [6] [7] [8] ... [10] [next >>]
*
* replace ".." with actual link when between previous and next is only one
*/
class Html_Pager
{
protected $pager;
/**
* Create a new pager
*
* @param integer $itemCount Number of items in total
* @param integer $perPage Number of items on one page
* @param integer $currentPage Current page, beginning with 1
* @param string $filename URL the page number shall be appended
*/
public function __construct($itemCount, $perPage, $currentPage, $filename)
{
$append = true;
if (strpos($filename, '%d') !== false) {
$append = false;
}
$numPages = ceil($itemCount / $perPage);
$this->numPages = $numPages;
//1-based
$pages = [
1 => true,
2 => true,
$numPages - 1 => true,
$numPages => true,
];
if ($currentPage <= 6) {
$pages[3] = 3;
$pages[4] = 4;
$pages[5] = 5;
}
if ($currentPage >= $numPages - 5) {
$pages[$numPages - 2] = true;
$pages[$numPages - 3] = true;
$pages[$numPages - 4] = true;
}
for ($n = $currentPage - 2; $n <= $currentPage + 2; $n++) {
$pages[$n] = true;
}
foreach (array_keys($pages) as $key) {
if ($key < 1 || $key > $numPages) {
unset($pages[$key]);
}
}
if ($currentPage >= 7 && !isset($pages[4])) {
$pages[3] = null;
}
if ($currentPage <= $numPages - 6 && !isset($pages[$numPages - 3])) {
$pages[$numPages - 2] = null;
}
ksort($pages);
foreach ($pages as $pageNum => &$value) {
if ($pageNum == $currentPage) {
$value = ['active'=> false, 'title' => $pageNum];
} else if ($value !== null) {
$value = $this->makeLink($pageNum, $filename);
} else {
$value = ['active'=> false, 'title' => '…'];
}
}
$prev = ['active'=> false, 'title' => '« prev'];
if ($currentPage > 1) {
$prev = $this->makeLink($currentPage - 1, $filename, '« prev');
}
$next = ['active'=> false, 'title' => 'next »'];
if ($currentPage < $numPages) {
$next = $this->makeLink($currentPage + 1, $filename, 'next »');
}
//first and last are for opensearch
$first = ['active'=> false, 'title' => 'first'];
if ($currentPage > 1) {
$first = $this->makeLink(1, $filename, 'first');
}
$last = ['active'=> false, 'title' => 'last'];
if ($numPages > 1 && $currentPage < $numPages) {
$last = $this->makeLink($numPages, $filename, 'last');
}
$this->links = [
'prev' => $prev,
'next' => $next,
'first' => $first,
'last' => $last,
'pages' => $pages,
];
}
protected function makeLink($pageNum, $filename, $title = null)
{
$title = $title === null ? $pageNum : $title;
$url = $filename . '&page=' . $pageNum;
return [
'active' => true,
'url' => $url,
'title' => $title,
'html' => '<a href="' . htmlspecialchars($url)
. '" title="Page ' . $pageNum . '">'
. htmlspecialchars($title)
. '</a>',
];
}
public function getLinks()
{
return $this->links;
}
public function getFullUrls()
{
$arUrls = array();
foreach ($this->links as $key => $link) {
if ($key == 'pages') {
continue;
}
if ($link['active']) {
$arUrls[$key] = str_replace(
'&', '&',
Helper::fullUrl('/' . $link['url'])
);
}
}
return $arUrls;
}
public function numPages()
{
return $this->numPages;
return $this->pager->numPages();
}
}
?>
|
