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<?php
/**
* CPagination class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright &copy; 2008-2009 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CPagination represents information relevant to pagination.
*
* When data needs to be rendered in multiple pages, we can use CPagination to
* represent information such as {@link getItemCount total item count},
* {@link getPageSize page size}, {@link getCurrentPage current page}, etc.
* These information can be passed to {@link CBasePager pagers} to render
* pagination buttons or links.
*
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.web
* @since 1.0
*/
class CPagination extends CComponent
{
/**
* The default page size.
*/
const DEFAULT_PAGE_SIZE=10;
/**
* @var string name of the GET variable storing the current page index. Defaults to 'page'.
*/
public $pageVar='page';
/**
* @var string the route (controller ID and action ID) for displaying the paged contents.
* Defaults to empty string, meaning using the current route.
*/
public $route='';
private $_pageSize=self::DEFAULT_PAGE_SIZE;
private $_itemCount=0;
private $_currentPage;
/**
* Constructor.
* @param integer total number of items.
* @since 1.0.1
*/
public function __construct($itemCount=0)
{
$this->setItemCount($itemCount);
}
/**
* @return integer number of items in each page. Defaults to 10.
*/
public function getPageSize()
{
return $this->_pageSize;
}
/**
* @param integer number of items in each page
*/
public function setPageSize($value)
{
if(($this->_pageSize=$value)<=0)
$this->_pageSize=self::DEFAULT_PAGE_SIZE;
}
/**
* @return integer total number of items. Defaults to 0.
*/
public function getItemCount()
{
return $this->_itemCount;
}
/**
* @param integer total number of items.
*/
public function setItemCount($value)
{
if(($this->_itemCount=$value)<0)
$this->_itemCount=0;
}
/**
* @return integer number of pages
*/
public function getPageCount()
{
return (int)(($this->_itemCount+$this->_pageSize-1)/$this->_pageSize);
}
/**
* @param boolean whether to recalculate the current page based on the page size and item count.
* @return integer the zero-based index of the current page. Defaults to 0.
*/
public function getCurrentPage($recalculate=true)
{
if($this->_currentPage===null || $recalculate)
{
if(isset($_GET[$this->pageVar]))
{
$this->_currentPage=(int)$_GET[$this->pageVar]-1;
$pageCount=$this->getPageCount();
if($this->_currentPage>=$pageCount)
$this->_currentPage=$pageCount-1;
if($this->_currentPage<0)
$this->_currentPage=0;
}
else
$this->_currentPage=0;
}
return $this->_currentPage;
}
/**
* @param integer the zero-based index of the current page.
*/
public function setCurrentPage($value)
{
$this->_currentPage=$value;
}
/**
* Creates the URL suitable for pagination.
* This method is mainly called by pagers when creating URLs used to
* perform pagination. The default implementation is to call
* the controller's createUrl method with the page information.
* You may override this method if your URL scheme is not the same as
* the one supported by the controller's createUrl method.
* @param CController the controller that will create the actual URL
* @param integer the page that the URL should point to. This is a zero-based index.
* @return string the created URL
*/
public function createPageUrl($controller,$page)
{
$params=($this->route==='')?$_GET:array();
if($page>0) // page 0 is the default
$params[$this->pageVar]=$page+1;
else
unset($params[$this->pageVar]);
return $controller->createUrl($this->route,$params);
}
/**
* Applies LIMIT and OFFSET to the specified query criteria.
* @param CDbCriteria the query criteria that should be applied with the limit
* @since 1.0.1
*/
public function applyLimit($criteria)
{
$criteria->limit=$this->pageSize;
$criteria->offset=$this->currentPage*$this->pageSize;
}
}
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