今天在看到CCAction的继承关系中,有一个CCCallFunc类,其下有三个子类:
CCCallFuncN
CCCallFuncND
CCCallFuncO
于是研究了下这三个类,回想起之前CCObject类中有这样一段代码:
typedef void (CCObject::*SEL_SCHEDULE)(float); typedef void (CCObject::*SEL_CallFunc)(); typedef void (CCObject::*SEL_CallFuncN)(CCNode*); typedef void (CCObject::*SEL_CallFuncND)(CCNode*,void*); typedef void (CCObject::*SEL_CallFuncO)(CCObject*); typedef void (CCObject::*SEL_MenuHandler)(CCObject*); typedef void (CCObject::*SEL_EventHandler)(CCEvent*); typedef int (CCObject::*SEL_Compare)(CCObject*); #define schedule_selector(_SELECTOR) (SEL_SCHEDULE)(&_SELECTOR) #define callfunc_selector(_SELECTOR) (SEL_CallFunc)(&_SELECTOR) #define callfuncN_selector(_SELECTOR) (SEL_CallFuncN)(&_SELECTOR) #define callfuncND_selector(_SELECTOR) (SEL_CallFuncND)(&_SELECTOR) #define callfuncO_selector(_SELECTOR) (SEL_CallFuncO)(&_SELECTOR) #define menu_selector(_SELECTOR) (SEL_MenuHandler)(&_SELECTOR) #define event_selector(_SELECTOR) (SEL_EventHandler)(&_SELECTOR) #define compare_selector(_SELECTOR) (SEL_Compare)(&_SELECTOR)
于是觉得这两者之前是联系起来的。所以以下是用法:
在头文件中声明需要回调的函数,针对三个回调的参数不同,需要实现不同的函数:
void funCallBack(); void funCallBackN(CCNode *node); void funCallBackND(CCNode *node,void *param); void funCallBackO(CCObject *pSender);
然后在实现文件cpp中,定义CCAction:
CCSprite *sprite=CCSprite::create("Icon.png"); this->addChild(sprite); CCCallFunc *funC=CCCallFunc::create(this,callfunc_selector(HelloWorld::funCallBack)); sprite->runAction(funC); CCCallFuncN *funN=CCCallFuncN::create(this,callfuncN_selector(HelloWorld::funCallBackN)); sprite->runAction(funN); int i=8; CCCallFuncND *funND=CCCallFuncND::create(this,callfuncND_selector(HelloWorld::funCallBackND),(void *)&i); sprite->runAction(funND); CCObject *obj=new CCObject(); CCCallFuncO *funO=CCCallFuncO::create(this,callfuncO_selector(HelloWorld::funCallBackO),obj); sprite->runAction(funO);
最后实现方法调用:
void HelloWorld::funCallBack() { CCLOG("funCcallBack Ok"); } void HelloWorld::funCallBackN(CCNode *node) { CCLOG("funNcallBack Ok"); } void HelloWorld::funCallBackND(CCNode *node,void *param) { CCLOG("%d",param); CCLOG("funNDcallBack Ok"); } void HelloWorld::funCallBackO(CCObject *pSender) { if(pSender) { CCLOG("non NULL"); } CCLOG("funOcallBack Ok"); } (编辑:李大同)
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