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<?php
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/**
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @link http://www.yiiframework.com/
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* @copyright Copyright © 2008-2011 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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/**
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* CPagination represents information relevant to pagination.
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*
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* When data needs to be rendered in multiple pages, we can use CPagination to
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* represent information such as {@link getItemCount total item count},
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* {@link getPageSize page size}, {@link getCurrentPage current page}, etc.
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* These information can be passed to {@link CBasePager pagers} to render
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* pagination buttons or links.
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*
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* Example:
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*
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* Controller action:
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* <pre>
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* function actionIndex(){
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* $criteria=new CDbCriteria();
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* $count=Article::model()->count($criteria);
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* $pages=new CPagination($count);
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*
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* // results per page
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* $pages->pageSize=10;
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* $pages->applyLimit($criteria);
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* $models=Article::model()->findAll($criteria);
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*
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* $this->render('index', array(
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* 'models' => $models,
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* 'pages' => $pages
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* ));
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* }
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* </pre>
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*
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* View:
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* <pre>
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* <?php foreach($models as $model): ?>
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* // display a model
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* <?php endforeach; ?>
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*
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* // display pagination
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* <?php $this->widget('CLinkPager', array(
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* 'pages' => $pages,
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* )) ?>
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* </pre>
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*
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* @property integer $pageSize Number of items in each page. Defaults to 10.
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* @property integer $itemCount Total number of items. Defaults to 0.
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* @property integer $pageCount Number of pages.
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* @property integer $currentPage The zero-based index of the current page. Defaults to 0.
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* @property integer $offset The offset of the data. This may be used to set the
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* OFFSET value for a SQL statement for fetching the current page of data.
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* @property integer $limit The limit of the data. This may be used to set the
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* LIMIT value for a SQL statement for fetching the current page of data.
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* This returns the same value as {@link pageSize}.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @version $Id$
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* @package system.web
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* @since 1.0
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*/
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class CPagination extends CComponent
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{
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/**
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* The default page size.
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*/
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const DEFAULT_PAGE_SIZE = 10;
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/**
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* @var string name of the GET variable storing the current page index. Defaults to 'page'.
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*/
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public $pageVar = 'page';
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/**
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* @var string the route (controller ID and action ID) for displaying the paged contents.
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* Defaults to empty string, meaning using the current route.
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*/
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public $route = '';
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/**
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* @var array of parameters (name=>value) that should be used instead of GET when generating pagination URLs.
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* Defaults to null, meaning using the currently available GET parameters.
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*/
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public $params;
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/**
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* @var boolean whether to ensure {@link currentPage} is returning a valid page number.
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* When this property is true, the value returned by {@link currentPage} will always be between
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* 0 and ({@link pageCount}-1). Because {@link pageCount} relies on the correct value of {@link itemCount},
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* it means you must have knowledge about the total number of data items when you want to access {@link currentPage}.
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* This is fine for SQL-based queries, but may not be feasible for other kinds of queries (e.g. MongoDB).
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* In those cases, you may set this property to be false to skip the validation (you may need to validate yourself then).
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* Defaults to true.
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* @since 1.1.4
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*/
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public $validateCurrentPage = true;
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private $_pageSize = self::DEFAULT_PAGE_SIZE;
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private $_itemCount = 0;
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private $_currentPage;
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/**
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* Constructor.
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* @param integer $itemCount total number of items.
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*/
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public function __construct($itemCount = 0)
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{
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$this->setItemCount($itemCount);
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}
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/**
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* @return integer number of items in each page. Defaults to 10.
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*/
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public function getPageSize()
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{
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return $this->_pageSize;
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}
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/**
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* @param integer $value number of items in each page
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*/
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public function setPageSize($value)
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{
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if (($this->_pageSize = $value) <= 0) {
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$this->_pageSize = self::DEFAULT_PAGE_SIZE;
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}
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}
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/**
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* @return integer total number of items. Defaults to 0.
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*/
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public function getItemCount()
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{
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return $this->_itemCount;
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}
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/**
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* @param integer $value total number of items.
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*/
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public function setItemCount($value)
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{
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if (($this->_itemCount = $value) < 0) {
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$this->_itemCount = 0;
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}
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}
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/**
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* @return integer number of pages
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*/
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public function getPageCount()
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{
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return (int)(($this->_itemCount + $this->_pageSize - 1) / $this->_pageSize);
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}
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/**
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* @param boolean $recalculate whether to recalculate the current page based on the page size and item count.
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* @return integer the zero-based index of the current page. Defaults to 0.
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*/
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public function getCurrentPage($recalculate = true)
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{
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if ($this->_currentPage === null || $recalculate) {
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if (isset($_GET[$this->pageVar])) {
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$this->_currentPage = (int)$_GET[$this->pageVar] - 1;
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if ($this->validateCurrentPage) {
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$pageCount = $this->getPageCount();
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if ($this->_currentPage >= $pageCount) {
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$this->_currentPage = $pageCount - 1;
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}
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}
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if ($this->_currentPage < 0) {
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$this->_currentPage = 0;
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}
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} else {
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$this->_currentPage = 0;
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}
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}
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return $this->_currentPage;
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}
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/**
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* @param integer $value the zero-based index of the current page.
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*/
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public function setCurrentPage($value)
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{
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$this->_currentPage = $value;
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$_GET[$this->pageVar] = $value + 1;
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}
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/**
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* Creates the URL suitable for pagination.
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* This method is mainly called by pagers when creating URLs used to
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* perform pagination. The default implementation is to call
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* the controller's createUrl method with the page information.
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* You may override this method if your URL scheme is not the same as
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* the one supported by the controller's createUrl method.
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* @param CController $controller the controller that will create the actual URL
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* @param integer $page the page that the URL should point to. This is a zero-based index.
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* @return string the created URL
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*/
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public function createPageUrl($controller, $page)
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{
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$params = $this->params === null ? $_GET : $this->params;
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if ($page > 0) // page 0 is the default
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{
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$params[$this->pageVar] = $page + 1;
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} else {
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unset($params[$this->pageVar]);
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}
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return $controller->createUrl($this->route, $params);
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}
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/**
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* Applies LIMIT and OFFSET to the specified query criteria.
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* @param CDbCriteria $criteria the query criteria that should be applied with the limit
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*/
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public function applyLimit($criteria)
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{
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$criteria->limit = $this->getLimit();
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$criteria->offset = $this->getOffset();
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}
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/**
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* @return integer the offset of the data. This may be used to set the
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* OFFSET value for a SQL statement for fetching the current page of data.
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* @since 1.1.0
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*/
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public function getOffset()
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{
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return $this->getCurrentPage() * $this->getPageSize();
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}
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/**
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* @return integer the limit of the data. This may be used to set the
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* LIMIT value for a SQL statement for fetching the current page of data.
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* This returns the same value as {@link pageSize}.
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* @since 1.1.0
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*/
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public function getLimit()
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{
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return $this->getPageSize();
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}
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}
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