<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: 麦当苗儿 <zuojiazi@vip.qq.com> <http://www.zjzit.cn>
// +----------------------------------------------------------------------
namespace Think;


// +----------------------------------------------------------------------  
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]  
// +----------------------------------------------------------------------  
// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.  
// +----------------------------------------------------------------------  
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )  
// +----------------------------------------------------------------------  
// | Author: liu21st <liu21st@gmail.com>  
// |         lanfengye <zibin_5257@163.com>  
// +----------------------------------------------------------------------  
class Page {  
      
    // 分页栏每页显示的页数  
    public $rollPage = 5;  
    // 页数跳转时要带的参数  
    public $parameter  ;  
    // 分页URL地址  
    public $url     =   '';  
    // 默认列表每页显示行数  
    public $listRows = 20;  
    // 起始行数  
    public $firstRow    ;  
    // 分页总页面数  
    protected $totalPages  ;  
    // 总行数  
    protected $totalRows  ;  
    // 当前页数  
    protected $nowPage    ;  
    // 分页的栏的总页数  
    protected $coolPages   ;  
    // 分页显示定制  
    protected $config  =    array('header'=>'条记录','prev'=>'上一页','next'=>'下一页','first'=>'第一页','last'=>'<span id="lastspan">最后一页</span>','theme'=>'<ul><li><span> %totalRow% %header% %nowPage%/%totalPage% 页</span></li> %first%  %upPage% %prePage%  %linkPage% %downPage%  %nextPage% %end%</ul>');  
    // 默认分页变量名  
    protected $varPage;  
    /** 
     * 架构函数 
     * @access public 
     * @param array $totalRows  总的记录数 
     * @param array $listRows  每页显示记录数 
     * @param array $parameter  分页跳转的参数 
     */  
    public function __construct($totalRows,$listRows='',$parameter='',$url='') {  
        $this->totalRows    =   $totalRows;  
        $this->parameter    =   $parameter;  
        $this->varPage      =   C('VAR_PAGE') ? C('VAR_PAGE') : 'p' ;  
        if(!empty($listRows)) {  
            $this->listRows =   intval($listRows);  
        }  
        $this->totalPages   =   ceil($this->totalRows/$this->listRows);     //总页数  
        $this->coolPages    =   ceil($this->totalPages/$this->rollPage);  
        $this->nowPage      =   !empty($_GET[$this->varPage])?intval($_GET[$this->varPage]):1;  
        if($this->nowPage<1){  
            $this->nowPage  =   1;  
        }elseif(!empty($this->totalPages) && $this->nowPage>$this->totalPages) {  
            $this->nowPage  =   $this->totalPages;  
        }  
        $this->firstRow     =   $this->listRows*($this->nowPage-1);  
        if(!empty($url))    $this->url  =   $url;   
    }  
    public function setConfig($name,$value) {  
        if(isset($this->config[$name])) {  
            $this->config[$name]    =   $value;  
        }  
    }  
    /** 
     * 分页显示输出 
     * @access public 
     */  
    public function show() {  
        if(0 == $this->totalRows) return '';  
        $p              =   $this->varPage;  
        $nowCoolPage    =   ceil($this->nowPage/$this->rollPage);  
        // 分析分页参数  
        if($this->url){  
            $depr       =   C('URL_PATHINFO_DEPR');  
            $url        =   rtrim(U('/'.$this->url,'',false),$depr).$depr.'__PAGE__';  
        }else{  
            if($this->parameter && is_string($this->parameter)) {  
                parse_str($this->parameter,$parameter);  
            }elseif(is_array($this->parameter)){  
                $parameter      =   $this->parameter;  
            }elseif(empty($this->parameter)){  
                unset($_GET[C('VAR_URL_PARAMS')]);  
                $var =  !empty($_POST)?$_POST:$_GET;  
                if(empty($var)) {  
                    $parameter  =   array();  
                }else{  
                    $parameter  =   $var;  
                }  
            }  
            $parameter[$p]  =   '__PAGE__';  
            $url            =   U('',$parameter);  
        }  
        //上下翻页字符串  
        $upRow          =   $this->nowPage-1;  
        $downRow        =   $this->nowPage+1;  
        if ($upRow>0){  
            $upPage     =    "<li><a href='".str_replace('__PAGE__',$upRow,$url)."'>".$this->config['prev']."</a></li>";  
        }else{  
            $upPage     =    '';  
        }  
        if ($downRow <= $this->totalPages){  
            $downPage   =   "<li><a href='".str_replace('__PAGE__',$downRow,$url)."'>".$this->config['next']."</a></li>";  
        }else{  
            $downPage   =   '';  
        }  
        // << < > >>  
        if($nowCoolPage == 1){  
            $theFirst   =   '';  
            $prePage    =   '';  
        }else{  
            $preRow     =   $this->nowPage-$this->rollPage;  
            $prePage    =   "<li><a href='".str_replace('__PAGE__',$preRow,$url)."' >上".$this->rollPage."页</a></li>";  
            $theFirst   =   "<li><a href='".str_replace('__PAGE__',1,$url)."' >".$this->config['first']."</a></li>";  
        }  
        if($nowCoolPage == $this->coolPages){  
            $nextPage   =   '';  
            $theEnd     =   '';  
        }else{  
            $nextRow    =   $this->nowPage+$this->rollPage;  
            $theEndRow  =   $this->totalPages;  
            $nextPage   =   "<li><a href='".str_replace('__PAGE__',$nextRow,$url)."' >下".$this->rollPage."页</a></li>";  
            $theEnd     =   "</li><a href='".str_replace('__PAGE__',$theEndRow,$url)."' >".$this->config['last']."</a></li>";  
        }  
        // 1 2 3 4 5  
        $linkPage = "";  
        for($i=1;$i<=$this->rollPage;$i++){  
            $page       =   ($nowCoolPage-1)*$this->rollPage+$i;  
            if($page!=$this->nowPage){  
                if($page<=$this->totalPages){  
                    $linkPage .= "<li><a href='".str_replace('__PAGE__',$page,$url)."'>".$page."</a></li>";  
                }else{  
                    break;  
                }  
            }else{  
                if($this->totalPages != 1){  
                    $linkPage .= "<li><span class='current'>".$page."</span></li>";  
                }  
            }  
        }  
        $pageStr     =   str_replace(  
            array('%header%','%nowPage%','%totalRow%','%totalPage%','%upPage%','%downPage%','%first%','%prePage%','%linkPage%','%nextPage%','%end%'),  
            array($this->config['header'],$this->nowPage,$this->totalRows,$this->totalPages,$upPage,$downPage,$theFirst,$prePage,$linkPage,$nextPage,$theEnd),$this->config['theme']);  
        return $pageStr;  
    }  
}  
