<?
/**
* filename: ext_page.class.php
* @package:phpbean
* @author :feifengxlq<feifengxlq#gmail.com><http://www.phpobject.net/>
* @copyright :Copyright 2006 feifengxlq
* @license:version 2.0
* @create:2006-5-31
* @modify:2006-6-1
* @modify:feifengxlq 2006-11-4
* description:超强分页类，四种分页模式，默认采用类似baidu,google的分页风格。
* 2.0增加功能：支持自定义风格，自定义样式，同时支持PHP4和PHP5,
* to see detail,please visit http://www.phpobject.net/blog/read.php?
* example:
* 模式四种分页模式：
   require_once('../libs/classes/page.class.php');
   $page=new page(array('total'=>1000,'perpage'=>20));
   echo 'mode:1<br>'.$page->show();
   echo '<hr>mode:2<br>'.$page->show(2);
   echo '<hr>mode:3<br>'.$page->show(3);
   echo '<hr>mode:4<br>'.$page->show(4);
   开启AJAX：
   $ajaxpage=new page(array('total'=>1000,'perpage'=>20,'ajax'=>'ajax_page','page_name'=>'test'));
   echo 'mode:1<br>'.$ajaxpage->show();
   采用继承自定义分页显示模式：
   demo:http://www.phpobject.net/blog
*/
class page  
{
    /**
     * config ,public
     */
    var $page_name="PB_page";//page标签，用来控制url页。比如说xxx.php?PB_page=2中的PB_page
    var $next_page='>';//下一页
    var $pre_page='<';//上一页
    var $first_page='First';//首页
    var $last_page='Last';//尾页
    var $pre_bar='<<';//上一分页条
    var $next_bar='>>';//下一分页条
    var $format_left='[';
    var $format_right=']';
    var $is_ajax=false;//是否支持AJAX分页模式    
    
    /**
     * private
     *
     */    
    var $pagebarnum=10;//控制记录条的个数。
    var $totalpage=0;//总页数
    var $ajax_action_name='';//AJAX动作名
    var $nowindex=1;//当前页
    var $url="";//url地址头
    var $offset=0;
    
    /**
     * constructor构造函数
     *
     * @param array $array['total'],$array['perpage'],$array['nowindex'],$array['url'],$array['ajax']...
     */
    function page($array)
    {
        if(is_array($array)){
           if(!array_key_exists('total',$array))$this->error(__FUNCTION__,'need a param of total');
           $total=intval($array['total']);
           $perpage=(array_key_exists('perpage',$array))?intval($array['perpage']):10;
           $nowindex=(array_key_exists('nowindex',$array))?intval($array['nowindex']):'';
           $url=(array_key_exists('url',$array))?$array['url']:'';
        }else{
           $total=$array;
           $perpage=10;
           $nowindex='';
           $url='';
        }
        if((!is_int($total))||($total<0))$this->error(__FUNCTION__,$total.' is not a positive integer!');
        if((!is_int($perpage))||($perpage<=0))$this->error(__FUNCTION__,$perpage.' is not a positive integer!');
        if(!empty($array['page_name']))$this->set('page_name',$array['page_name']);//设置pagename
        $this->_set_nowindex($nowindex);//设置当前页
        $this->_set_url($url);//设置链接地址
        $this->totalpage=ceil($total/$perpage);
        $this->offset=($this->nowindex-1)*$this->perpage;
        if(!empty($array['ajax']))$this->open_ajax($array['ajax']);//打开AJAX模式
    }
    /**
     * 设定类中指定变量名的值，如果改变量不属于这个类，将throw一个exception
     *
     * @param string $var
     * @param string $value
     */
    function set($var,$value)
    {
        if(in_array($var,get_object_vars($this)))
           $this->$var=$value;
        else {
            $this->error(__FUNCTION__,$var." does not belong to PB_Page!");
        }
        
    }
    /**
     * 打开倒AJAX模式
     *
     * @param string $action 默认ajax触发的动作。
     */
    function open_ajax($action)
    {
        $this->is_ajax=true;
        $this->ajax_action_name=$action;
    }
    /**
     * 获取显示"下一页"的代码
     *  
     * @param string $style
     * @return string
     */
    function next_page($style='')
    {
        if($this->nowindex<$this->totalpage){
            return $this->_get_link($this->_get_url($this->nowindex+1),$this->next_page,$style);
        }
        return '<span class="'.$style.'">'.$this->next_page.'</span>';
    }
    
    /**
     * 获取显示“上一页”的代码
     *
     * @param string $style
     * @return string
     */
    function pre_page($style='')
    {
        if($this->nowindex>1){
            return $this->_get_link($this->_get_url($this->nowindex-1),$this->pre_page,$style);
        }
        return '<span class="'.$style.'">'.$this->pre_page.'</span>';
    }
    
    /**
     * 获取显示“首页”的代码
     *
     * @return string
     */
    function first_page($style='')
    {
        if($this->nowindex==1){
            return '<span class="'.$style.'">'.$this->first_page.'</span>';
        }
        return $this->_get_link($this->_get_url(1),$this->first_page,$style);
    }
    
    /**
     * 获取显示“尾页”的代码
     *
     * @return string
     */
    function last_page($style='')
    {
        if($this->nowindex==$this->totalpage){
            return '<span class="'.$style.'">'.$this->last_page.'</span>';
        }
        return $this->_get_link($this->_get_url($this->totalpage),$this->last_page,$style);
    }
    
    function nowbar($style='',$nowindex_style='')
    {
        $plus=ceil($this->pagebarnum/2);
        if($this->pagebarnum-$plus+$this->nowindex>$this->totalpage)$plus=($this->pagebarnum-$this->totalpage+$this->nowindex);
        $begin=$this->nowindex-$plus+1;
        $begin=($begin>=1)?$begin:1;
        $return='';
        for($i=$begin;$i<$begin+$this->pagebarnum;$i++)
        {
            if($i<=$this->totalpage){
                if($i!=$this->nowindex)
                    $return.=$this->_get_text($this->_get_link($this->_get_url($i),$i,$style));
                else  
                    $return.=$this->_get_text('<span class="'.$nowindex_style.'">'.$i.'</span>');
            }else{
                break;
            }
            $return.="\n";
        }
        unset($begin);
        return $return;
    }
    /**
     * 获取显示跳转按钮的代码
     *
     * @return string
     */
    function select()
    {
        $return='<select name="PB_Page_Select" onchange="window.location.href=\''.$this->url.'\'+this.options[this.selectedIndex].value">';
        for($i=1;$i<=$this->totalpage;$i++)
        {
            if($i==$this->nowindex){
                $return.='<option value="'.$i.'" selected>'.$i.'</option>';
            }else{
                $return.='<option value="'.$i.'">'.$i.'</option>';
            }
        }
        unset($i);
        $return.='</select>';
        return $return;
    }
    
    /**
     * 获取mysql 语句中limit需要的值
     *
     * @return string
     */
    function offset()
    {
        return $this->offset;
    }
    
    /**
     * 控制分页显示风格（你可以增加相应的风格）
     *
     * @param int $mode
     * @return string
     */
    function show($mode=1)
    {
        switch ($mode)
        {
            case '1':
                $this->next_page='下一页';
                $this->pre_page='上一页';
                return $this->pre_page().$this->nowbar().$this->next_page().'第'.$this->select().'页';
                break;
            case '2':
                $this->next_page='下一页';
                $this->pre_page='上一页';
                $this->first_page='首页';
                $this->last_page='尾页';
                return $this->first_page().$this->pre_page().'[第'.$this->nowindex.'页]'.$this->next_page().$this->last_page().'第'.$this->select().'页';
                break;
            case '3':
                $this->next_page='下一页';
                $this->pre_page='上一页';
                $this->first_page='首页';
                $this->last_page='尾页';
                return $this->first_page().$this->pre_page().$this->next_page().$this->last_page();
                break;
            case '4':
                $this->next_page='下一页';
                $this->pre_page='上一页';
                return $this->pre_page().$this->nowbar().$this->next_page();
                break;
            case '5':
                return $this->pre_bar().$this->pre_page().$this->nowbar().$this->next_page().$this->next_bar();
                break;
        }
        
    }
/*----------------private function (私有方法)-----------------------------------------------------------*/
    /**
     * 设置url头地址
     * @param: String $url
     * @return boolean
     */
    function _set_url($url="")
    {
        if(!empty($url)){
            //手动设置
            $this->url=$url.((stristr($url,'?'))?'&':'?').$this->page_name."=";
        }else{
            //自动获取
            if(empty($_SERVER['QUERY_STRING'])){
                //不存在QUERY_STRING时
                $this->url=$_SERVER['REQUEST_URI']."?".$this->page_name."=";
            }else{
                //
                if(stristr($_SERVER['QUERY_STRING'],$this->page_name.'=')){
                    //地址存在页面参数
                    $this->url=str_replace($this->page_name.'='.$this->nowindex,'',$_SERVER['REQUEST_URI']);
                    $last=$this->url[strlen($this->url)-1];
                    if($last=='?'||$last=='&'){
                        $this->url.=$this->page_name."=";
                    }else{
                        $this->url.='&'.$this->page_name."=";
                    }
                }else{
                    //
                    $this->url=$_SERVER['REQUEST_URI'].'&'.$this->page_name.'=';
                }//end if                
            }//end if
        }//end if
    }
    
    /**
     * 设置当前页面
     *
     */
    function _set_nowindex($nowindex)
    {
        if(empty($nowindex)){
            //系统获取
            
            if(isset($_GET[$this->page_name])){
                $this->nowindex=intval($_GET[$this->page_name]);
            }
        }else{
            //手动设置
            $this->nowindex=intval($nowindex);
        }
    }
        
    /**
     * 为指定的页面返回地址值
     *
     * @param int $pageno
     * @return string $url
     */
    function _get_url($pageno=1)
    {
        return $this->url.$pageno;
    }
    
    /**
     * 获取分页显示文字，比如说默认情况下_get_text('<a href="">1</a>')将返回[<a href="">1</a>]
     *
     * @param String $str
     * @return string $url
     */    
    function _get_text($str)
    {
        return $this->format_left.$str.$this->format_right;
    }
    
    /**
      * 获取链接地址
    */
    function _get_link($url,$text,$style=''){
        $style=(empty($style))?'':'class="'.$style.'"';
        if($this->is_ajax){
            //如果是使用AJAX模式
            return '<a '.$style.' href="javascript:'.$this->ajax_action_name.'(\''.$url.'\')">'.$text.'</a>';
        }else{
            return '<a '.$style.' href="'.$url.'">'.$text.'</a>';
        }
    }
    /**
      * 出错处理方式
    */
    function error($function,$errormsg)
    {
        die('Error in file <b>'.__FILE__.'</b> ,Function <b>'.$function.'()</b> :'.$errormsg);
    }
}
?>

<?
require_once('../libs/classes/page.class.php');
$page=new page(array('total'=>1000,'perpage'=>20));
echo 'mode:1<br>'.$page->show();
echo '<hr>mode:2<br>'.$page->show(2);
echo '<hr>mode:3<br>'.$page->show(3);
echo '<hr>mode:4<br>'.$page->show(4);
echo '<hr>开始AJAX模式:';
$ajaxpage=new page(array('total'=>1000,'perpage'=>20,'ajax'=>'ajax_page','page_name'=>'test'));
echo 'mode:1<br>'.$ajaxpage->show();
?>

<style type="text/css">
<!--
.pagenavi { text-align:center;  font: 11px Arial, tahoma, sans-serif; padding-top: 20px; padding-bottom: 10px; margin: 0px; }
.pagenavi a {border: 1px solid #E2F1AF; background: #FFFFFF; text-decoration: none; color:#C16012; display:inline-block; padding-left:6px; padding-right:6px; padding-top:2px; padding-bottom:2px}
.pagenavi a:visited {border: 1px solid #E2F1AF; background: #FFFFFF; text-decoration: none; padding-left:6px; padding-right:6px; padding-top:2px; padding-bottom:2px}
.pagenavi .break {border: medium none;  text-decoration: none; color:#C16012; background:;; padding-left:6px; padding-right:6px; padding-top:2px; padding-bottom:2px}
.pagenavi .num {color:#C16012; font-size:12pt; padding-left:3px; padding-right:3px; padding-top:0; padding-bottom:0}
.pagenavi .curr {padding: 2px 6px; border-color: #999; font-weight: bold; font-size:12pt; background:transparent;}
.pagenavi a:hover {color: #C16012; background: #E2F1AF; text-decoration: none}
-->
</style>
<?
require_once('../libs/classes/page.class.php');
class mypage extends page
{
    function mypage($array)
{
     parent::page($array);
  $this->first_page=1;
  $this->last_page=$this->totalpage;
  $this->set('format_left','');
  $this->set('format_right','');
}

function show()
{
     $pagestr='<div class="pagenavi" id="lopage">页:';
  $pagestr.=$this->first_page().' ';
  $pagestr.=$this->nowbar('','curr');
  $pagestr.='<span class="break">...</span>';
  $pagestr.=$this->last_page();
  $pagestr.='   (总计<span class="num">'.$this->totalpage.'</span>页) </div>';
  $pagestr.='</div>';
  return $pagestr;
}
}
$page=new mypage(array('total'=>1000,'perpage'=>20));
echo $page->show();
?>