<?php

// +----------------------------------------------------------------------

// | 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>

// +----------------------------------------------------------------------

// $Id$



class Page extends Think {

    // 起始行数

    public $firstRow	;

    // 列表每页显示行数

    public $listRows	;

    // 页数跳转时要带的参数

    public $parameter  ;

    // 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   ;

    // 分页栏每页显示的页数

    protected $rollPage   ;

	// 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'=>'最后一页','theme'=>' %totalRow% %header% %nowPage%/%totalPage% 页 %upPage% %downPage% %first%  %prePage%  %linkPage%  %nextPage% %end%');



    /**

     +----------------------------------------------------------

     * 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='') {

        $this->totalRows = $totalRows;

        $this->parameter = $parameter;

        $this->rollPage = C('PAGE_ROLLPAGE');

        $this->listRows = !empty($listRows)?$listRows:C('PAGE_LISTROWS');

        $this->totalPages = ceil($this->totalRows/$this->listRows);     //总页数

        $this->coolPages  = ceil($this->totalPages/$this->rollPage);

        $this->nowPage  = !empty($_GET[C('VAR_PAGE')])?$_GET[C('VAR_PAGE')]:1;

        if(!empty($this->totalPages) && $this->nowPage>$this->totalPages) {

            $this->nowPage = $this->totalPages;

        }

        $this->firstRow = $this->listRows*($this->nowPage-1);

    }



    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 = C('VAR_PAGE');

        $nowCoolPage      = ceil($this->nowPage/$this->rollPage);

        $url  =  $_SERVER['REQUEST_URI'].(strpos($_SERVER['REQUEST_URI'],'?')?'':"?").$this->parameter;

        $parse = parse_url($url);

        if(isset($parse['query'])) {

            parse_str($parse['query'],$params);

            unset($params[$p]);

            $url   =  $parse['path'].'?'.http_build_query($params);

        }

        //上下翻页字符串

        $upRow   = $this->nowPage-1;

        $downRow = $this->nowPage+1;

        if ($upRow>0){

            $upPage="<a href='".$url."&".$p."=$upRow'>".$this->config['prev']."</a>";

        }else{

            $upPage="";

        }



        if ($downRow <= $this->totalPages){

            $downPage="<a href='".$url."&".$p."=$downRow'>".$this->config['next']."</a>";

        }else{

            $downPage="";

        }

        // << < > >>

        if($nowCoolPage == 1){

            $theFirst = "";

            $prePage = "";

        }else{

            $preRow =  $this->nowPage-$this->rollPage;

            $prePage = "<a href='".$url."&".$p."=$preRow' >上".$this->rollPage."页</a>";

            $theFirst = "<a href='".$url."&".$p."=1' >".$this->config['first']."</a>";

        }

        if($nowCoolPage == $this->coolPages){

            $nextPage = "";

            $theEnd="";

        }else{

            $nextRow = $this->nowPage+$this->rollPage;

            $theEndRow = $this->totalPages;

            $nextPage = "<a href='".$url."&".$p."=$nextRow' >下".$this->rollPage."页</a>";

            $theEnd = "<a href='".$url."&".$p."=$theEndRow' >".$this->config['last']."</a>";

        }

        // 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){

                    $linkPage .= "&nbsp;<a href='".$url."&".$p."=$page'>&nbsp;".$page."&nbsp;</a>";

                }else{

                    break;

                }

            }else{

                if($this->totalPages != 1){

                    $linkPage .= "&nbsp;<span class='current'>".$page."</span>";

                }

            }

        }

        $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;

    }



}

?>