标签：cocos2dx cocostudio objectfactory 自动化注册
在cocos2dx的ui编辑器cocostudio有一套相关的api:
1、表示各个UI控件的类，如LoadingBar,ListView等等，其都继承自Widget
2、有相关各个UI控件解析的类，由于cocos提供UI编辑器，方便了开发者快速制作UI，动画等，载入游戏需要相关解析支持。
从cocos2dx的实现来看，通过ObjectFactory实现了，自动注册，将类型与创建UI接口对应，在UI解析方面，将类型与解析类别对应，都是
通过ObjectFactory来实现的，下面我看看相关分析：
1、首先我们要将类型与相应的UI创建方法建立对应，那么需要一个数据结构，在ObjectFactory里有一个叫TInfo，
typedef cocos2d::Ref* (*Instance)(void);
struct TInfo
{
TInfo(void);
TInfo(const std::string& type, Instance ins = NULL);
TInfo(const TInfo &t);
~TInfo(void);
TInfo& operator= (const TInfo &t);
std::string _class;
Instance _fun;
};
typedef cocos2d::Ref* (*Instance)(void);
在TInfo的构造函数里，有如下实现：
ObjectFactory::TInfo::TInfo(const std::string& type, Instance ins)
:_class(type)
,_fun(ins)
{
ObjectFactory::getInstance()->registerType(*this);
}知道，要想达到自动的目的，其中一个办法就是全局对象或者静态对象的构造函数里
在GUIDefine.h下有3个宏
#define DECLARE_CLASS_GUI_INFO public: static cocos2d::ObjectFactory::TInfo __Type; static cocos2d::Ref* createInstance(void);
#define IMPLEMENT_CLASS_GUI_INFO(className) cocos2d::Ref* className::createInstance(void) { return className::create(); } cocos2d::ObjectFactory::TInfo className::__Type(#className, &className::createInstance);
#define CREATE_CLASS_GUI_INFO(className) cocos2d::ObjectFactory::TInfo(#className, &className::createInstance) \知道静态成员都是属于类的。
在该文件的下面，还有专门给UIReader的宏，差别就是createInstance里的实现，不一样，UI是通过create,而UIReader是通过getInstance
#define DECLARE_CLASS_WIDGET_READER_INFO public: static cocos2d::ObjectFactory::TInfo __Type; static cocos2d::Ref* createInstance(void);
#define IMPLEMENT_CLASS_WIDGET_READER_INFO(className) cocos2d::Ref* className::createInstance(void) { return className::getInstance(); } cocos2d::ObjectFactory::TInfo className::__Type(#className, &className::createInstance);
#define CREATE_CLASS_WIDGET_READER_INFO(className) cocos2d::ObjectFactory::TInfo(#className, &className::createInstance) \
在所有ui扩展里的ui类实现，都会有
class UIClass : public Widget
{
// 注意这里
DECLARE_CLASS_GUI_INFO
...IMPLEMENT_CLASS_GUI_INFO(CheckBox)
同上，UIReader也用了类似的方式：
class LayoutReader : public WidgetReader
{
public:
DECLARE_CLASS_WIDGET_READER_INFO关于最后一个CREATE宏，发现其调用的地方，是GUIReader初始化 的时候，但是从上面分析，这些注册过程都是自动化的，这里主动调用是为何？
GUIReader::GUIReader():
m_strFilePath("")
{
ObjectFactory* factoryCreate = ObjectFactory::getInstance();
factoryCreate->registerType(CREATE_CLASS_WIDGET_READER_INFO(ButtonReader));
factoryCreate->registerType(CREATE_CLASS_WIDGET_READER_INFO(CheckBoxReader));
factoryCreate->registerType(CREATE_CLASS_WIDGET_READER_INFO(SliderReader));
factoryCreate->registerType(CREATE_CLASS_WIDGET_READER_INFO(ImageViewReader));
factoryCreate->registerType(CREATE_CLASS_WIDGET_READER_INFO(LoadingBarReader));
factoryCreate->registerType(CREATE_CLASS_WIDGET_READER_INFO(TextAtlasReader));
factoryCreate->registerType(CREATE_CLASS_WIDGET_READER_INFO(TextReader));
factoryCreate->registerType(CREATE_CLASS_WIDGET_READER_INFO(TextBMFontReader));
factoryCreate->registerType(CREATE_CLASS_WIDGET_READER_INFO(TextFieldReader));
factoryCreate->registerType(CREATE_CLASS_WIDGET_READER_INFO(LayoutReader));
factoryCreate->registerType(CREATE_CLASS_WIDGET_READER_INFO(PageViewReader));
factoryCreate->registerType(CREATE_CLASS_WIDGET_READER_INFO(ScrollViewReader));
factoryCreate->registerType(CREATE_CLASS_WIDGET_READER_INFO(ListViewReader));
factoryCreate->registerType(CREATE_CLASS_GUI_INFO(Button));
factoryCreate->registerType(CREATE_CLASS_GUI_INFO(CheckBox));
factoryCreate->registerType(CREATE_CLASS_GUI_INFO(ImageView));
factoryCreate->registerType(CREATE_CLASS_GUI_INFO(Text));
factoryCreate->registerType(CREATE_CLASS_GUI_INFO(TextAtlas));
factoryCreate->registerType(CREATE_CLASS_GUI_INFO(TextBMFont));
factoryCreate->registerType(CREATE_CLASS_GUI_INFO(LoadingBar));
factoryCreate->registerType(CREATE_CLASS_GUI_INFO(Slider));
factoryCreate->registerType(CREATE_CLASS_GUI_INFO(TextField));
factoryCreate->registerType(CREATE_CLASS_GUI_INFO(Layout));
factoryCreate->registerType(CREATE_CLASS_GUI_INFO(ListView));
factoryCreate->registerType(CREATE_CLASS_GUI_INFO(PageView));
factoryCreate->registerType(CREATE_CLASS_GUI_INFO(ScrollView));
}
标签：cocos2dx cocostudio objectfactory 自动化注册
原文地址：http://blog.csdn.net/djvc/article/details/44518493
