php 重写分页器 CLinkPager的实例

class MyPager extends CLinkPager
{
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",$buttons));
  echo implode("\n",$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,$ellipsis)=$this->getPageRange();

$currentPage=$this->getCurrentPage(false); // currentPage is calculated in getPageRange()
$buttons=array();

// first page
//$buttons[]=$this->createPageButton($this->firstPageLabel,$this->firstPageCssClass,$currentPage<=0,false);

// prev page
if(($page=$currentPage-1)<0)
  $page=0;
if($currentPage == 0){
  $buttons[] = "<span style='background:#a3a3a3'><上一頁</span>";
}else{
  $buttons[]=$this->createPageButton($this->prevPageLabel,$page,$this->previousPageCssClass,false);
}
// internal pages start
// first
$buttons[]=$this->createPageButton(1,$this->internalPageCssClass,false,$i==$currentPage);
//middle
if($ellipsis == 'both'){
  $buttons[] = "<span style='background:#a3a3a3'>...</span>";
}
for($i=$beginPage;$i<=$endPage;++$i){
  if($ellipsis == 'left' && $i == $beginPage){
    $buttons[] = "<span style='background:#a3a3a3'>...</span>";
  }
  $buttons[]=$this->createPageButton($i+1,$i,$i==$currentPage);
  if($ellipsis == 'right' && $i == $endPage){
    $buttons[] = "<span style='background:#a3a3a3'>...</span>";
  }
}  
if($ellipsis == 'both'){
  $buttons[] = "<span style='background:#a3a3a3'>...</span>";
}
// last
$buttons[]=$this->createPageButton($pageCount,$pageCount - 1,$i==$currentPage);
// internal pages end
// next page
if(($page=$currentPage+1)>=$pageCount-1)
  $page=$pageCount-1;
if($currentPage == ($pageCount-1)){
  $buttons[] = "<span style='background:#a3a3a3'>下一頁></span>";
}else{
  $buttons[]=$this->createPageButton($this->nextPageLabel,$this->nextPageCssClass,$currentPage>=$pageCount-1,false);
}
// last page
//$buttons[]=$this->createPageButton($this->lastPageLabel,$pageCount-1,$this->lastPageCssClass,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,$class,$hidden,$selected)
  {
  if($hidden || $selected)
  $class.=' '.($hidden ? $this->hiddenPageCssClass : $this->selectedPageCssClass);
  if ($selected) {
  $result = "" . ++$page . "";
  } else {
  $result = CHtml::link($label,$this->createPageUrl($page));
  }
  return $result;
  }

/**

• @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-$this->maxButtonCount+1);
  }*/
  if($pageCount > $this->maxButtonCount){
  if($currentPage > 4 && $currentPage < ($pageCount - 4)){
  // print_r('a');
  $beginPage = $currentPage - 2;
  $endPage = $currentPage + 2;
  $ellipsis = 'both';
  }else{
  $beginPage=max(1,$currentPage-(int)($this->maxButtonCount/2));
  if($beginPage == 1){
  $ellipsis = 'right';
  }else{
  $ellipsis = 'left';
  }
  if(($endPage=$beginPage+$this->maxButtonCount-1)>=$pageCount)
  {
  // print_r('b');
  $endPage=$pageCount-2;
  $beginPage=max(1,$endPage-$this->maxButtonCount+1);
  }elseif(($endPage=$beginPage+$this->maxButtonCount-1)>=$pageCount-2){
  // print_r('c');
  $endPage=$pageCount-2;
  }

  }
  }else{
  $beginPage=max(1,$currentPage-(int)($this->maxButtonCount/2));
  if(($endPage=$beginPage+$this->maxButtonCount-1)>=$pageCount)
  {
  $endPage=$pageCount-2;
  $beginPage=max(1,$endPage-$this->maxButtonCount+1);
  }
  }

return array($beginPage,$ellipsis);

}

/**

• 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);
  }
  }

widget('zii.widgets.CListView',array( 'dataProvider'=>$dataProvider,'itemView'=>'_view_t','pager'=>array( 'class'=>'MyPager',) ));