GUIReader分析(1):
1、GUIReader用于cocostudio所做UI界面导出json的解析，
并生成对应的UI元素。
GUIReader* GUIReader::shareReader()
{
    if (!sharedReader)
    {
        sharedReader = new GUIReader();
    }
    return sharedReader;
}

2、主要函数：
cocos2d::ui::Widget* widgetFromJsonFile(const char* fileName);
-----源码-->>>
//解析json文件
cocos2d::ui::Widget* GUIReader::widgetFromJsonFile(const char *fileName)
{
	unsigned char *pBytes = NULL;
	std::string jsonpath;
	rapidjson::Document jsonDict;
	//获取json文件的全路径
    jsonpath = CCFileUtils::sharedFileUtils()->fullPathForFilename(fileName);

    int pos = jsonpath.find_last_of('/');
	m_strFilePath = jsonpath.substr(0,pos+1);
    unsigned long size = 0;

    //读取json文件
    pBytes = CCFileUtils::sharedFileUtils()->getFileData(jsonpath.c_str(),"r",&size);
	if(NULL == pBytes || strcmp((const char*)pBytes,"") == 0)
	{
		printf("read json file[%s] error!\n",fileName);
		return NULL;
	}
	CCData *data = new CCData(pBytes,size);
	std::string load_str = std::string((const char *)data->getBytes(),data->getSize() );
	CC_SAFE_DELETE(data);
	//解析json文件内容
	jsonDict.Parse<0>(load_str.c_str());
    if (jsonDict.HasParseError())
    {
        CCLOG("GetParseError %s\n",jsonDict.GetParseError());
    }
    cocos2d::ui::Widget* widget = NULL;

    //DICTOOL获取json信息的工具类#define DICTOOL DictionaryHelper::shareHelper()

    //得到json文件的版本，即使用那个版本的cocostudio做的
    const char* fileVersion = DICTOOL->getStringValue_json(jsonDict,"version");
    WidgetPropertiesReader * pReader = NULL;
    if (fileVersion)
    {
        //根据不同的版本去掉用不同的解析类，如 "version": "1.6.0.0",versionInteger = 1600
	//所以我们这里使用WidgetPropertiesReader0300
        int versionInteger = getVersionInteger(fileVersion);
        if (versionInteger < 250)
        {
            pReader = new WidgetPropertiesReader0250();
            widget = pReader->createWidget(jsonDict,m_strFilePath.c_str(),fileName);
        }
        else
        {
            pReader = new WidgetPropertiesReader0300();
            widget = pReader->createWidget(jsonDict,fileName);
        }
    }
    else
    {
        pReader = new WidgetPropertiesReader0250();
        widget = pReader->createWidget(jsonDict,fileName);
    }
    
    CC_SAFE_DELETE(pReader);
    CC_SAFE_DELETE_ARRAY(pBytes);
    return widget;
}

3、WidgetPropertiesReader0300类的分析：
3.1、
//jsonDict -- 解析后的json数据
//m_strFilePath  -- json文件所在目录的全路径，不包含json文件名
//fileName  -- json文件名
   createWidget(jsonDict,fileName)方法：
----->>>>
/*0.3.0.0~1.0.0.0*/ 这里有点疑惑，看到这个注释我以为WidgetPropertiesReader0300用来解析0.3.0.0~1.0.0.0的版本，
//但是我调试了下，想我上面分析的那样，我是用cocostudio的版本是1.6.0.0，
//"version": "1.6.0.0",versionInteger = 1600,大于250，所以使用的是WidgetPropertiesReader0300解析。
//所以忽略这个注释。
cocos2d::ui::Widget* WidgetPropertiesReader0300::createWidget(const rapidjson::Value& data,const char* fullPath,const char* fileName)
{
    m_strFilePath = fullPath;
    
    /*如果我们在制作界面的过程中使用了.plist问价，那么生成的json文件中会有
    textures 字段，如下所示：
    "textures": [
       "hero.plist"
    ]
    */
    int texturesCount = DICTOOL->getArrayCount_json(data,"textures");
    
    //.plist文件，用CCSpriteFrameCache加载，路径为json文件的全路径目录部分 + "xx.plist"
    for (int i=0; i<texturesCount; i++)
    {
        const char* file = DICTOOL->getStringValueFromArray_json(data,"textures",i);
        std::string tp = fullPath;
        tp.append(file);
        CCSpriteFrameCache::sharedSpriteFrameCache()->addSpriteFramesWithFile(tp.c_str());
    }

     /*  
	"designHeight": 640,"designWidth": 960,*/
    float fileDesignWidth = DICTOOL->getFloatValue_json(data,"designWidth");
    float fileDesignHeight = DICTOOL->getFloatValue_json(data,"designHeight");
    if (fileDesignWidth <= 0 || fileDesignHeight <= 0) {
        printf("Read design size error!\n");
        CCSize winSize = CCDirector::sharedDirector()->getWinSize();
        GUIReader::shareReader()->storeFileDesignSize(fileName,winSize);
    }
    else
    {
        GUIReader::shareReader()->storeFileDesignSize(fileName,CCSizeMake(fileDesignWidth,fileDesignHeight));
    }

    /*
	    "widgetTree": {
	    "classname": "Panel","name": null,"children": [
    */
    //解析UI树，生成UI
    const rapidjson::Value& widgetTree = DICTOOL->getSubDictionary_json(data,"widgetTree");
    cocos2d::ui::Widget* widget = widgetFromJsonDictionary(widgetTree);
    
    /* *********temp********* */
    if (widget->getContentSize().equals(CCSizeZero))
    {
        widget->setSize(CCSizeMake(fileDesignWidth,fileDesignHeight));
    }
    /* ********************** */
    
    //    widget->setFileDesignSize(CCSizeMake(fileDesignWidth,fileDesignHeight));
    const rapidjson::Value& actions = DICTOOL->getSubDictionary_json(data,"animation");
    /* *********temp********* */
    //    ActionManager::shareManager()->releaseActions();
    /* ********************** */
    CCLOG("file name == [%s]",fileName);
	CCObject* rootWidget = (CCObject*) widget;
    ActionManager::shareManager()->initWithDictionary(fileName,actions,rootWidget);
    return widget;
}

------>>>>
widgetFromJsonDictionary:
//根据json文件生成UI树
cocos2d::ui::Widget* WidgetPropertiesReader0300::widgetFromJsonDictionary(const rapidjson::Value& data)
{
    //获取类名，如： "classname": "Panel"
    const char* classname = DICTOOL->getStringValue_json(data,"classname");
    const rapidjson::Value& uiOptions = DICTOOL->getSubDictionary_json(data,"options");

    //根据类名创建不同的对象，在GUIReader构造函数中，注册了很多类的创建函数。
    /*
    在GUIReader::GUIReader()
{
    
    
    ObjectFactory* factoryCreate = ObjectFactory::getInstance();
    
    factoryCreate->registerType(CREATE_CLASS_WIDGET_READER_INFO(ButtonReader));
    .......
    
    factoryCreate->registerType(CREATE_CLASS_GUI_INFO(Button));
    .............
}

    */
    cocos2d::ui::Widget* widget = ObjectFactory::getInstance()->createGUI(classname);
    
    // create widget reader to parse properties of widget
    // 得到不同UI元素的对应的不同解析类，如ButtonReader，CheckBoxReader等等
    std::string readerName = getWidgetReaderClassName(classname);
    
    WidgetReaderProtocol* reader = this->createWidgetReaderProtocol(readerName);
    
    if (reader)
    {
        // widget parse with widget reader
        setPropsForAllWidgetFromJsonDictionary(reader,widget,uiOptions);
    }
    else
    {
        // 1st.,custom widget parse properties of parent widget with parent widget reader
	// 自定义控件
        readerName = this->getWidgetReaderClassName(widget);
        reader =  this->createWidgetReaderProtocol(readerName);
        if (reader && widget) {
            setPropsForAllWidgetFromJsonDictionary(reader,uiOptions);
            
            // 2nd.,custom widget parse with custom reader
            const char* customProperty = DICTOOL->getStringValue_json(uiOptions,"customProperty");
            rapidjson::Document customJsonDict;
            customJsonDict.Parse<0>(customProperty);
            if (customJsonDict.HasParseError())
            {
                CCLOG("GetParseError %s\n",customJsonDict.GetParseError());
            }
            setPropsForAllCustomWidgetFromJsonDictionary(classname,customJsonDict);
        }else{
            CCLOG("Widget or WidgetReader doesn't exists!!!  Please check your json file.");
        }
    }
    
    //遍历子节点UI树，生成整个UI树，最终返回根节点
    int childrenCount = DICTOOL->getArrayCount_json(data,"children");
    for (int i = 0; i < childrenCount; i++)
    {
        const rapidjson::Value& subData = DICTOOL->getDictionaryFromArray_json(data,"children",i);
        cocos2d::ui::Widget* child = widgetFromJsonDictionary(subData);
        if (child)
        {
            PageView* pageView = dynamic_cast<PageView*>(widget);
            if (pageView)
            {
                pageView->addPage(static_cast<Layout*>(child));
            }
            else
            {
                ListView* listView = dynamic_cast<ListView*>(widget);
                if (listView)
                {
                    listView->pushBackCustomItem(child);
                }
                else
                {
                    widget->addChild(child);
                }
            }
        }
    }
    return widget;
}