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| // PHP CODE Highliting for CU by dZ902
<?
/**
*
*
* @version $Id$
* @copyright 2006
*/
/**
* What we need to input?
* - which page is currently in?
* - how many records are there?
* - how many records perpage?
* - how many page numbers in a list?
* What we need to output?
* - a list of links to different pages
* - previous/next page links (optional)
* - first/last page links (optional)
**/
class Pager
{
var $numItems = 1000;
var $itemsPerPage = 10;
var $numPages;
var $currPageId = 1;
var $prevPageId = 0;
var $nextPageId = 0;
var $pagesPerList = 3;
var $list = array(); // example
function Pager($params)
{
$this->numItems = $params['numItems'];
$this->itemsPerPage = $params['itemsPerPage'];
$this->pagesPerList = $params['pagesPerList'];
$this->currPageId = $params['currPageId'];
$this->numPages = ceil($this->numItems / $this->itemsPerPage);
}
function getList()
{
if ($this->currPageId > $this->numPages || $this->currPageId < 0) {
// error: invalid page input [current page]
}
if ($this->numPages == 1) {
// only one page
$this->prevPageId = -1;
$this->nextPageId = -1;
} elseif ($this->currPageId == 1) {
// at first page
$this->prevPageId = -1;
$this->nextPageId = $this->currPageId + 1;
} elseif ($this->currPageId == $this->numPages) {
// at last page
$this->prevPageId = $this->currPageId - 1;
$this->nextPageId = -1;
} else {
// normal
$this->prevPageId = $this->currPageId - 1;
$this->nextPageId = $this->currPageId + 1;
}
if ($this->numPages < $this->pagesPerList) {
// total pages is within capacity - show all pages
$this->list = range(1, $this->numPages);
} else {
if ($this->pagesPerList % 2 != 0) {
// even bounds, current page is at center
$bound = floor($this->pagesPerList / 2);
$low = $this->currPageId - $bound;
$high = $this->currPageId + $bound;
} else {
// odd bounds, split it as -1 and +1
$bound = ($this->pagesPerList / 2) - 1;
$low = $this->currPageId - $bound;
$high = $this->currPageId + $bound + 1;
}
if ($low < 1) {
// lower bound overrun
$high = $high + (-$low) + 1;
$low = 1;
} elseif ($high > $this->numPages) {
// higher bound overrun
$low = $low - ($high - $this->numPages);
$high = $this->numPages;
}
if ($this->currPageId == 0) {
// plain list
++$high;
}
$this->list = range($low, $high);
}
return $this->list;
}
function isFirstPage()
{
if (empty($this->list)) {
// error [pager data not loaded]
} else {
return ($this->prevPageId == -1);
}
}
function isLastPage()
{
if (empty($this->list)) {
// error [pager data not loaded]
} else {
return ($this->nextPageId == -1);
}
}
function _debug()
{
$tmp = &new Pager(array('numItems' => 150,
'itemsPerPage' => 10,
'pagesPerList' => 5,
'currPageId' => 0));
for ($a = 'a', $b = 1; $a < 'h', $b < 15; ++$a, ++$b) {
$param = array('numItems' => 150,
'itemsPerPage' => 10,
'pagesPerList' => 5,
'currPageId' => $b);
$tmp->Pager($param);
$tmp->getList();
echo "{$a}) ";
if (!$tmp->isFirstPage()) {
echo "<< ";
} else {
echo " ";
}
foreach($tmp->list as $l){
if ($tmp->currPageId == $l) {
echo " {{$l}} ";
} else {
echo " {$l} ";
}
}
echo "\n";
}
}
}
Pager::_debug();
?>
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楼主: ste2008
发表于 2007-09-03 13:49
