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finished Pagination.

tags/2.0.0-beta
Qiang Xue 12 years ago
parent
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1 changed files with 87 additions and 124 deletions
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  1. 211
      framework/web/Pagination.php

211
framework/web/Pagination.php
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@ -7,59 +7,57 @@
namespace yii\web;
use Yii;
/**
* Pagination represents information relevant to pagination.
* Pagination represents information relevant to pagination of data items.
*
* When data needs to be rendered in multiple pages, we can use Pagination 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.
* When data needs to be rendered in multiple pages, Pagination can be used to
* represent information such as [[itemCount|total item count]], [[pageSize|page size]],
* [[page|current page]], etc. These information can be passed to [[yii\web\widgets\Pager|pagers]]
* to render pagination buttons or links.
*
* Example:
* The following example shows how to create a pagination object and feed it
* to a pager.
*
* Controller action:
*
* ~~~
* function actionIndex()
* {
* $criteria=new CDbCriteria();
* $count=Article::model()->count($criteria);
* $pages=new Pagination($count);
*
* // results per page
* $pages->pageSize=10;
* $pages->applyLimit($criteria);
* $models=Article::model()->findAll($criteria);
* $query = Article::find()->where(array('status' => 1));
* $countQuery = clone $query;
* $pages = new Pagination($countQuery->count());
* $models = $query->offset($pages->offset)
* ->limit($pages->limit)
* ->all();
*
* $this->render('index', array(
* 'models' => $models,
* 'models' => $models,
* 'pages' => $pages
* ));
* }
* ~~~
*
* View:
* <pre>
*
* ~~~
* <?php foreach($models as $model): ?>
* // display a model
* ...display a model...
* <?php endforeach; ?>
*
* // display pagination
* <?php $this->widget('CLinkPager', array(
* <?php $this->widget('yii\web\widgets\LinkPager', array(
* 'pages' => $pages,
* )) ?>
* </pre>
* ~~~
*
* @property integer $pageSize Number of items in each page. Defaults to 10.
* @property integer $itemCount Total number of items. Defaults to 0.
* @property integer $pageCount Number of pages.
* @property integer $currentPage The zero-based index of the current page. Defaults to 0.
* @property integer $page The zero-based index of the current page.
* @property integer $offset The offset of the data. This may be used to set the
* OFFSET value for a SQL statement for fetching the current page of data.
* @property integer $limit The limit of the data. This may be used to set the
* LIMIT value for a SQL statement for fetching the current page of data.
* This returns the same value as {@link pageSize}.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
@ -67,82 +65,53 @@ namespace yii\web;
class Pagination extends \yii\base\Object
{
/**
* 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 = '';
/**
* @var array of parameters (name=>value) that should be used instead of GET when generating pagination URLs.
* Defaults to null, meaning using the currently available GET parameters.
* @var boolean whether to always have the page parameter in the URL created by [[createUrl()]].
* If false and [[page]] is 0, the page parameter will not be put in the URL.
*/
public $params;
public $forcePageVar = false;
/**
* @var boolean whether to ensure {@link currentPage} is returning a valid page number.
* When this property is true, the value returned by {@link currentPage} will always be between
* 0 and ({@link pageCount}-1). Because {@link pageCount} relies on the correct value of {@link itemCount},
* it means you must have knowledge about the total number of data items when you want to access {@link currentPage}.
* This is fine for SQL-based queries, but may not be feasible for other kinds of queries (e.g. MongoDB).
* In those cases, you may set this property to be false to skip the validation (you may need to validate yourself then).
* Defaults to true.
* @since 1.1.4
* @var string the route (controller ID and action ID) for displaying the paged contents.
* If not set, it means using the currently requested route.
*/
public $validateCurrentPage = true;
private $_pageSize = self::DEFAULT_PAGE_SIZE;
private $_itemCount = 0;
private $_currentPage;
public $route;
/**
* Constructor.
* @param integer $itemCount total number of items.
* @var array parameters (name=>value) that should be used to obtain the current page number
* and to create new pagination URLs. If not set, $_GET will be used instead.
* The array element indexed by [[pageVar]] is considered to be the current page number.
* If the element does not exist, the current page number is considered 0.
*/
public function __construct($itemCount = 0)
{
$this->setItemCount($itemCount);
}
public $params;
/**
* @return integer number of items in each page. Defaults to 10.
* @var boolean whether to check if [[page]] is within valid range.
* When this property is true, the value of [[page]] will always be between 0 and ([[pageCount]]-1).
* Because [[pageCount]] relies on the correct value of [[itemCount]] which may not be available
* in some cases (e.g. MongoDB), you may want to set this property to be false to disable the page
* number validation. By doing so, [[page]] will return the value indexed by [[pageVar]] in [[params]].
*/
public function getPageSize()
{
return $this->_pageSize;
}
public $validatePage = true;
/**
* @param integer $value number of items in each page
* @var integer number of items on each page. Defaults to 10.
* If it is less than 1, it means the page size is infinite, and thus a single page contains all items.
*/
public function setPageSize($value)
{
if (($this->_pageSize = $value) <= 0) {
$this->_pageSize = self::DEFAULT_PAGE_SIZE;
}
}
public $pageSize = 10;
/**
* @return integer total number of items. Defaults to 0.
* @var integer total number of items.
*/
public function getItemCount()
{
return $this->_itemCount;
}
public $itemCount;
/**
* @param integer $value total number of items.
* Constructor.
* @param integer $itemCount total number of items.
* @param array $config name-value pairs that will be used to initialize the object properties
*/
public function setItemCount($value)
public function __construct($itemCount, $config = array())
{
if (($this->_itemCount = $value) < 0) {
$this->_itemCount = 0;
}
$this->itemCount = $itemCount;
parent::__construct($config);
}
/**
@ -150,94 +119,88 @@ class Pagination extends \yii\base\Object
*/
public function getPageCount()
{
return (int)(($this->_itemCount + $this->_pageSize - 1) / $this->_pageSize);
if ($this->pageSize < 1) {
return $this->itemCount > 0 ? 1 : 0;
} else {
$itemCount = $this->itemCount < 0 ? 0 : (int)$this->itemCount;
return (int)(($itemCount + $this->pageSize - 1) / $this->pageSize);
}
}
private $_page;
/**
* Returns the zero-based current page number.
* @param boolean $recalculate whether to recalculate the current page based on the page size and item count.
* @return integer the zero-based index of the current page. Defaults to 0.
* @return integer the zero-based current page number.
*/
public function getCurrentPage($recalculate = true)
public function getPage($recalculate = false)
{
if ($this->_currentPage === null || $recalculate) {
if (isset($_GET[$this->pageVar])) {
$this->_currentPage = (int)$_GET[$this->pageVar] - 1;
if ($this->validateCurrentPage) {
if ($this->_page === null || $recalculate) {
$params = $this->params === null ? $_GET : $this->params;
if (isset($params[$this->pageVar])) {
$this->_page = (int)$params[$this->pageVar] - 1;
if ($this->validatePage) {
$pageCount = $this->getPageCount();
if ($this->_currentPage >= $pageCount) {
$this->_currentPage = $pageCount - 1;
if ($this->_page >= $pageCount) {
$this->_page = $pageCount - 1;
}
}
if ($this->_currentPage < 0) {
$this->_currentPage = 0;
if ($this->_page < 0) {
$this->_page = 0;
}
} else {
$this->_currentPage = 0;
$this->_page = 0;
}
}
return $this->_currentPage;
return $this->_page;
}
/**
* Sets the current page number.
* @param integer $value the zero-based index of the current page.
*/
public function setCurrentPage($value)
public function setPage($value)
{
$this->_currentPage = $value;
$_GET[$this->pageVar] = $value + 1;
$this->_page = $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 $controller the controller that will create the actual URL
* @param integer $page the page that the URL should point to. This is a zero-based index.
* Creates the URL suitable for pagination with the specified page number.
* This method is mainly called by pagers when creating URLs used to perform pagination.
* @param integer $page the zero-based page number that the URL should point to.
* @return string the created URL
* @see params
* @see forcePageVar
*/
public function createPageUrl($controller, $page)
public function createUrl($page)
{
$params = $this->params === null ? $_GET : $this->params;
if ($page > 0) // page 0 is the default
{
if ($page > 0 || $page >= 0 && $this->forcePageVar) {
$params[$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 $criteria the query criteria that should be applied with the limit
*/
public function applyLimit($criteria)
{
$criteria->limit = $this->getLimit();
$criteria->offset = $this->getOffset();
$route = $this->route === null ? Yii::$app->controller->route : $this->route;
return Yii::$app->getUrlManager()->createUrl($route, $params);
}
/**
* @return integer the offset of the data. This may be used to set the
* OFFSET value for a SQL statement for fetching the current page of data.
* @since 1.1.0
*/
public function getOffset()
{
return $this->getCurrentPage() * $this->getPageSize();
return $this->pageSize < 1 ? 0 : $this->getPage() * $this->pageSize;
}
/**
* @return integer the limit of the data. This may be used to set the
* LIMIT value for a SQL statement for fetching the current page of data.
* This returns the same value as {@link pageSize}.
* @since 1.1.0
* Note that if the page size is infinite, a value -1 will be returned.
*/
public function getLimit()
{
return $this->getPageSize();
return $this->pageSize < 1 ? -1 : $this->pageSize;
}
}
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