LinkPager.php
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<?php
/**
* CLinkPager class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright © 2008-2011 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CLinkPager displays a list of hyperlinks that lead to different pages of target.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.web.widgets.pagers
* @since 1.0
*/
class LinkPager extends CBasePager
{
const CSS_FIRST_PAGE = 'first';
const CSS_LAST_PAGE = 'last';
const CSS_PREVIOUS_PAGE = 'previous';
const CSS_NEXT_PAGE = 'next';
const CSS_INTERNAL_PAGE = 'page';
const CSS_HIDDEN_PAGE = 'hidden';
const CSS_SELECTED_PAGE = 'selected';
/**
* @var string the CSS class for the first page button. Defaults to 'first'.
* @since 1.1.11
*/
public $firstPageCssClass = self::CSS_FIRST_PAGE;
/**
* @var string the CSS class for the last page button. Defaults to 'last'.
* @since 1.1.11
*/
public $lastPageCssClass = self::CSS_LAST_PAGE;
/**
* @var string the CSS class for the previous page button. Defaults to 'previous'.
* @since 1.1.11
*/
public $previousPageCssClass = self::CSS_PREVIOUS_PAGE;
/**
* @var string the CSS class for the next page button. Defaults to 'next'.
* @since 1.1.11
*/
public $nextPageCssClass = self::CSS_NEXT_PAGE;
/**
* @var string the CSS class for the internal page buttons. Defaults to 'page'.
* @since 1.1.11
*/
public $internalPageCssClass = self::CSS_INTERNAL_PAGE;
/**
* @var string the CSS class for the hidden page buttons. Defaults to 'hidden'.
* @since 1.1.11
*/
public $hiddenPageCssClass = self::CSS_HIDDEN_PAGE;
/**
* @var string the CSS class for the selected page buttons. Defaults to 'selected'.
* @since 1.1.11
*/
public $selectedPageCssClass = self::CSS_SELECTED_PAGE;
/**
* @var integer maximum number of page buttons that can be displayed. Defaults to 10.
*/
public $maxButtonCount = 10;
/**
* @var string the text label for the next page button. Defaults to 'Next >'.
*/
public $nextPageLabel;
/**
* @var string the text label for the previous page button. Defaults to '< Previous'.
*/
public $prevPageLabel;
/**
* @var string the text label for the first page button. Defaults to '<< First'.
*/
public $firstPageLabel;
/**
* @var string the text label for the last page button. Defaults to 'Last >>'.
*/
public $lastPageLabel;
/**
* @var string the text shown before page buttons. Defaults to 'Go to page: '.
*/
public $header;
/**
* @var string the text shown after page buttons.
*/
public $footer = '';
/**
* @var mixed the CSS file used for the widget. Defaults to null, meaning
* using the default CSS file included together with the widget.
* If false, no CSS file will be used. Otherwise, the specified CSS file
* will be included when using this widget.
*/
public $cssFile;
/**
* @var array HTML attributes for the pager container tag.
*/
public $htmlOptions = array();
/**
* Initializes the pager by setting some default property values.
*/
public function init()
{
if ($this->nextPageLabel === null)
$this->nextPageLabel = Yii::t('yii', 'Next >');
if ($this->prevPageLabel === null)
$this->prevPageLabel = Yii::t('yii', '< Previous');
if ($this->firstPageLabel === null)
$this->firstPageLabel = Yii::t('yii', '<< First');
if ($this->lastPageLabel === null)
$this->lastPageLabel = Yii::t('yii', 'Last >>');
if ($this->header === null)
$this->header = Yii::t('yii', 'Go to page: ');
if (!isset($this->htmlOptions['id']))
$this->htmlOptions['id'] = $this->getId();
if (!isset($this->htmlOptions['class']))
$this->htmlOptions['class'] = 'yiiPager';
}
/**
* Executes the widget.
* This overrides the parent implementation by displaying the generated page buttons.
*/
public function run()
{
$this->registerClientScript();
$buttons = $this->createPageButtons();
if (empty($buttons))
return;
echo $this->header;
echo CHtml::tag('ul', $this->htmlOptions, implode("\n", $buttons));
echo $this->footer;
}
/**
* Creates the page buttons.
* @return array a list of page buttons (in HTML code).
*/
protected function createPageButtons()
{
if (($pageCount = $this->getPageCount()) <= 1)
return array();
list($beginPage, $endPage) = $this->getPageRange();
$currentPage = $this->getCurrentPage(false); // currentPage is calculated in getPageRange()
$buttons = array();
// first page
$buttons[] = $this->createPageButton($this->firstPageLabel, 0, $this->firstPageCssClass, $currentPage <= 0, false);
// prev page
if (($page = $currentPage - 1) < 0)
$page = 0;
$buttons[] = $this->createPageButton($this->prevPageLabel, $page, $this->previousPageCssClass, $currentPage <= 0, false,'←');
// internal pages
for ($i = $beginPage; $i < $endPage; ++$i)
$buttons[] = $this->createPageButton($i + 1, $i, $this->internalPageCssClass, false, $i == $currentPage,'', '|');
$buttons[] = $this->createPageButton($i + 1, $i, $this->internalPageCssClass, false, $i == $currentPage);
// next page
if (($page = $currentPage + 1) >= $pageCount - 1)
$page = $pageCount - 1;
$buttons[] = $this->createPageButton($this->nextPageLabel, $page, $this->nextPageCssClass, $currentPage >= $pageCount - 1, false,'','→');
// last page
$buttons[] = $this->createPageButton($this->lastPageLabel, $pageCount - 1, $this->lastPageCssClass, $currentPage >= $pageCount - 1, false);
return $buttons;
}
/**
* Creates a page button.
* You may override this method to customize the page buttons.
* @param string $label the text label for the button
* @param integer $page the page number
* @param string $class the CSS class for the page button.
* @param boolean $hidden whether this page button is visible
* @param boolean $selected whether this page button is selected
* @return string the generated button
*/
protected function createPageButton($label, $page, $class, $hidden, $selected, $suffix='',$postfix = '')
{
if ($hidden || $selected)
$class .= ' ' . ($hidden ? $this->hiddenPageCssClass : $this->selectedPageCssClass);
return '<li class="' . $class . '">' .$suffix. CHtml::link($label, $this->createPageUrl($page)) . $postfix . '</li>';
}
/**
* @return array the begin and end pages that need to be displayed.
*/
protected function getPageRange()
{
$currentPage = $this->getCurrentPage();
$pageCount = $this->getPageCount();
$beginPage = max(0, $currentPage - (int)($this->maxButtonCount / 2));
if (($endPage = $beginPage + $this->maxButtonCount - 1) >= $pageCount) {
$endPage = $pageCount - 1;
$beginPage = max(0, $endPage - $this->maxButtonCount + 1);
}
return array($beginPage, $endPage);
}
/**
* Registers the needed client scripts (mainly CSS file).
*/
public function registerClientScript()
{
if ($this->cssFile !== false)
self::registerCssFile($this->cssFile);
}
/**
* Registers the needed CSS file.
* @param string $url the CSS URL. If null, a default CSS URL will be used.
*/
public static function registerCssFile($url = null)
{
if ($url === null)
$url = CHtml::asset(Yii::getPathOfAlias('system.web.widgets.pagers.pager') . '.css');
Yii::app()->getClientScript()->registerCssFile($url);
}
}