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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
// $Id: Widget.class.php 2783 2012-02-25 06:49:45Z liu21st $
/**
+------------------------------------------------------------------------------
* ThinkPHP Widget类 抽象类
+------------------------------------------------------------------------------
* @category Think
* @package Think
* @subpackage Util
* @author liu21st <liu21st@gmail.com>
* @version $Id: Widget.class.php 2783 2012-02-25 06:49:45Z liu21st $
+------------------------------------------------------------------------------
*/
abstract class Widget {
// 使用的模板引擎 每个Widget可以单独配置不受系统影响
protected $template = '';
/**
+----------------------------------------------------------
* 渲染输出 render方法是Widget唯一的接口
* 使用字符串返回 不能有任何输出
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param mixed $data 要渲染的数据
+----------------------------------------------------------
* @return string
+----------------------------------------------------------
*/
abstract public function render($data);
/**
+----------------------------------------------------------
* 渲染模板输出 供render方法内部调用
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param string $templateFile 模板文件
* @param mixed $var 模板变量
+----------------------------------------------------------
* @return string
+----------------------------------------------------------
*/
protected function renderFile($templateFile='',$var='') {
ob_start();
ob_implicit_flush(0);
if(!file_exists_case($templateFile)){
// 自动定位模板文件
$name = substr(get_class($this),0,-6);
$filename = empty($templateFile)?$name:$templateFile;
$templateFile = LIB_PATH.'Widget/'.$name.'/'.$filename.C('TMPL_TEMPLATE_SUFFIX');
if(!file_exists_case($templateFile))
throw_exception(L('_TEMPLATE_NOT_EXIST_').'['.$templateFile.']');
}
$template = strtolower($this->template?$this->template:(C('TMPL_ENGINE_TYPE')?C('TMPL_ENGINE_TYPE'):'php'));
if('php' == $template) {
// 使用PHP模板
if(!empty($var)) extract($var, EXTR_OVERWRITE);
// 直接载入PHP模板
include $templateFile;
}elseif('think'==$template){ // 采用Think模板引擎
if($this->checkCache($templateFile)) { // 缓存有效
// 分解变量并载入模板缓存
extract($var, EXTR_OVERWRITE);
//载入模版缓存文件
include C('CACHE_PATH').md5($templateFile).C('TMPL_CACHFILE_SUFFIX');
}else{
$tpl = Think::instance('ThinkTemplate');
// 编译并加载模板文件
$tpl->fetch($templateFile,$var);
}
}else{
$class = 'Template'.ucwords($template);
if(is_file(CORE_PATH.'Driver/Template/'.$class.'.class.php')) {
// 内置驱动
$path = CORE_PATH;
}else{ // 扩展驱动
$path = EXTEND_PATH;
}
require_cache($path.'Driver/Template/'.$class.'.class.php');
$tpl = new $class;
$tpl->fetch($templateFile,$var);
}
$content = ob_get_clean();
return $content;
}
/**
+----------------------------------------------------------
* 检查缓存文件是否有效
* 如果无效则需要重新编译
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param string $tmplTemplateFile 模板文件名
+----------------------------------------------------------
* @return boolen
+----------------------------------------------------------
*/
protected function checkCache($tmplTemplateFile) {
if (!C('TMPL_CACHE_ON')) // 优先对配置设定检测
return false;
$tmplCacheFile = C('CACHE_PATH').md5($tmplTemplateFile).C('TMPL_CACHFILE_SUFFIX');
if(!is_file($tmplCacheFile)){
return false;
}elseif (filemtime($tmplTemplateFile) > filemtime($tmplCacheFile)) {
// 模板文件如果有更新则缓存需要更新
return false;
}elseif (C('TMPL_CACHE_TIME') != 0 && time() > filemtime($tmplCacheFile)+C('TMPL_CACHE_TIME')) {
// 缓存是否在有效期
return false;
}
// 缓存有效
return true;
}
}
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