【2014-01-26】cocos2dx学习笔记：触摸响应

[历史归档]本文原发布于 cstriker1407.info 个人博客，内容为历史存档，仅供参考。
发布时间：2014-01-26｜ 标题：cocos2dx学习笔记：触摸响应｜分类：编程 / C && C++ / cocos2dx ｜标签：cocos2dx·事件响应

最近项目中用到了cocos2dx来开发一个基于陀螺仪的demo，忙了半个星期，一边学习一边开发，总算搞了出来。这里备份下开发中学习到的一些cocos2dx知识。

cocos2dx事件响应源码摘录：

基于版本：2.2.1，代码版权属于cocos原作者。

CCLayer关于事件响应的代码：

setTouchEnabled：

voidCCLayer::setTouchEnabled(boolenabled){if(m_bTouchEnabled!=enabled){m_bTouchEnabled=enabled;if(m_bRunning){if(enabled){//注册事件响应this->registerWithTouchDispatcher();}else{//去除注册事件响应// have problems?CCDirector::sharedDirector()->getTouchDispatcher()->removeDelegate(this);}}}}

registerWithTouchDispatcher：

voidCCLayer::registerWithTouchDispatcher(){CCTouchDispatcher*pDispatcher=CCDirector::sharedDirector()->getTouchDispatcher();// Using LuaBindingsif(m_pScriptTouchHandlerEntry){//lua相关，先略去。。。。。}else{//从此处可以发现，TouchMode和TouchPriority可以决定注册事件响应的类型。//而Mode和Priority可以通过get/set设置。if(m_eTouchMode==kCCTouchesAllAtOnce){pDispatcher->addStandardDelegate(this,0);}else{pDispatcher->addTargetedDelegate(this,m_nTouchPriority,true);}}}//TouchMode的枚举定义如下:typedefenum{kCCTouchesAllAtOnce,kCCTouchesOneByOne,}ccTouchesMode;//get set 如下：voidCCLayer::setTouchMode(ccTouchesMode mode){if(m_eTouchMode!=mode){m_eTouchMode=mode;if(m_bTouchEnabled){setTouchEnabled(false);setTouchEnabled(true);}}}voidCCLayer::setTouchPriority(intpriority){if(m_nTouchPriority!=priority){m_nTouchPriority=priority;if(m_bTouchEnabled){setTouchEnabled(false);setTouchEnabled(true);}}}intCCLayer::getTouchPriority(){returnm_nTouchPriority;}intCCLayer::getTouchMode(){returnm_eTouchMode;}

代码看到此处，根据前文【 cocos2dx学习笔记：吞噬事件相应 】提到的方法，也可以使用下面代码：

//CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, -210, true);this->setTouchPriority(-210);this->setTouchMode(kCCTouchesOneByOne);this->setTouchEnabled(true);

CCTouchDispatcher：

voidCCTouchDispatcher::touches(CCSet*pTouches,CCEvent*pEvent,unsignedintuIndex){CCAssert(uIndex>=0&&uIndex<4,"");CCSet*pMutableTouches;m_bLocked=true;// optimization to prevent a mutable copy when it is not necessaryunsignedintuTargetedHandlersCount=m_pTargetedHandlers->count();unsignedintuStandardHandlersCount=m_pStandardHandlers->count();boolbNeedsMutableSet=(uTargetedHandlersCount&&uStandardHandlersCount);pMutableTouches=(bNeedsMutableSet?pTouches->mutableCopy():pTouches);structccTouchHandlerHelperDatasHelper=m_sHandlerHelperData;//// process the target handlers 1st//if(uTargetedHandlersCount>0){CCTouch*pTouch;CCSetIterator setIter;for(setIter=pTouches->begin();setIter!=pTouches->end();++setIter){pTouch=(CCTouch*)(*setIter);CCTargetedTouchHandler*pHandler=NULL;CCObject*pObj=NULL;CCARRAY_FOREACH(m_pTargetedHandlers,pObj){pHandler=(CCTargetedTouchHandler*)(pObj);if(!pHandler){break;}boolbClaimed=false;if(uIndex==CCTOUCHBEGAN){bClaimed=pHandler->getDelegate()->ccTouchBegan(pTouch,pEvent);//如果该触摸began返回true，说明handler开始处理这个事件（，但是不代表handler要吞噬这个事件！！！）if(bClaimed){pHandler->getClaimedTouches()->addObject(pTouch);}}else//经过测试发现，当一个触摸事件生成之后，从began,到end和cancel，都是同一个对象。if(pHandler->getClaimedTouches()->containsObject(pTouch)){// moved ended canceledbClaimed=true;switch(sHelper.m_type){caseCCTOUCHMOVED:pHandler->getDelegate()->ccTouchMoved(pTouch,pEvent);break;caseCCTOUCHENDED:pHandler->getDelegate()->ccTouchEnded(pTouch,pEvent);pHandler->getClaimedTouches()->removeObject(pTouch);break;caseCCTOUCHCANCELLED:pHandler->getDelegate()->ccTouchCancelled(pTouch,pEvent);pHandler->getClaimedTouches()->removeObject(pTouch);break;}}if(bClaimed&&pHandler->isSwallowsTouches()){if(bNeedsMutableSet){pMutableTouches->removeObject(pTouch);}//注意这里的break，如果目标触摸被响应而且被设置吞噬，那么直接跳出内层循环，后续handler均不能响应这个触摸。break;}}}}//// process standard handlers 2nd////当目标触摸全部结束之后，将挑剩下的touch事件一次性丢给标准触摸相应。if(uStandardHandlersCount>0&&pMutableTouches->count()>0){CCStandardTouchHandler*pHandler=NULL;CCObject*pObj=NULL;CCARRAY_FOREACH(m_pStandardHandlers,pObj){pHandler=(CCStandardTouchHandler*)(pObj);if(!pHandler){break;}switch(sHelper.m_type){caseCCTOUCHBEGAN:pHandler->getDelegate()->ccTouchesBegan(pMutableTouches,pEvent);break;caseCCTOUCHMOVED:pHandler->getDelegate()->ccTouchesMoved(pMutableTouches,pEvent);break;caseCCTOUCHENDED:pHandler->getDelegate()->ccTouchesEnded(pMutableTouches,pEvent);break;caseCCTOUCHCANCELLED:pHandler->getDelegate()->ccTouchesCancelled(pMutableTouches,pEvent);break;}}}if(bNeedsMutableSet){pMutableTouches->release();}//// Optimization. To prevent a which is expensive// the add/removes/quit is done after the iterations//m_bLocked=false;。。。。。。 。。。。。。}