cocos2d 2.0中 setTouchPriority无效的问题

发布时间：2020-12-14 17:13:01 所属栏目：百科来源：网络整理

导读：转载请注明地址：http://www.jb51.cc/article/p-nsewocfp-mg.html CCTouchDispatcher中是这样分发触摸事件的： [cpp] view plain copy CCARRAY_FOREACH(m_pTargetedHandlers,pObj) //这里是遍历了一个注册过触摸事件的数组，按优先级排序 { pHandler=(CCTarg

转载请注明地址：http://www.52php.cn/article/p-nsewocfp-mg.html

CCTouchDispatcher中是这样分发触摸事件的：

[cpp] 
   view plain 
   copy 
   
 CCARRAY_FOREACH(m_pTargetedHandlers,pObj)//这里是遍历了一个注册过触摸事件的数组，按优先级排序
 {
 pHandler=(CCTargetedTouchHandler*)(pObj);
 
 if(!pHandler)
break;
 }
 
 boolbClaimed=false;
if(uIndex==CCTOUCHBEGAN)
 bClaimed=pHandler->getDelegate()->ccTouchBegan(pTouch,pEvent);
if(bClaimed)
 pHandler->getClaimedTouches()->addObject(pTouch);
 }else
 if(pHandler->getClaimedTouches()->containsObject(pTouch))
 {
 //movedendedcanceled
 bClaimed=true;
switch(sHelper.m_type)
caseCCTOUCHMOVED:
 pHandler->getDelegate()->ccTouchMoved(pTouch,pEvent);
caseCCTOUCHENDED:
 pHandler->getDelegate()->ccTouchEnded(pTouch,248); line-height:18px; margin:0px!important; padding:0px 3px 0px 10px!important; list-style-position:outside!important"> pHandler->getClaimedTouches()->removeObject(pTouch);
caseCCTOUCHCANCELLED:
 pHandler->getDelegate()->ccTouchCancelled(pTouch,108); list-style-type:decimal-leading-zero; color:inherit; line-height:18px; margin:0px!important; padding:0px 3px 0px 10px!important; list-style-position:outside!important"> }
if(bClaimed&&pHandler->isSwallowsTouches())
if(bNeedsMutableSet)
 pMutableTouches->removeObject(pTouch);
break;
 }

然后如果调用这里的 setPriority，就会重新排序数组： rearrangeHandlers

copy 
    
   
voidCCTouchDispatcher::setPriority(intnPriority,CCTouchDelegate*pDelegate) CCAssert(pDelegate!=NULL,"");
 CCTouchHandler*handler=NULL;
 handler=this->findHandler(pDelegate);
 CCAssert(handler!=NULL,153); background-color:inherit; font-weight:bold">if(handler->getPriority()!=nPriority)
 handler->setPriority(nPriority);
this->rearrangeHandlers(m_pTargetedHandlers);
this->rearrangeHandlers(m_pStandardHandlers);
 }

但是在业务层调用的 setPriority是这样的：

copy 
    
   
voidCCTouchHandler::setPriority(intnPriority) m_nPriority=nPriority;
 }

所以你会发现如果在初始化一个控件的时候调用 setPriority就会有效，而在运行中动态更改就无效，就是因为初始化后的下一帧调用（调用onEnter时,会注册touchdelegate）会根据当前priority将其注册进那个数组：

copy 
    
   
voidCCTouchDispatcher::forceAddHandler(CCTouchHandler*pHandler,CCArray*pArray) unsignedintu=0;
 CCObject*pObj=NULL;
 CCARRAY_FOREACH(pArray,pObj)
 CCTouchHandler*h=(CCTouchHandler*)pObj;
if(h)
if(h->getPriority()<pHandler->getPriority())
 ++u;
if(h->getDelegate()==pHandler->getDelegate())
 CCAssert(0,"");
return;
 pArray->insertObject(pHandler,u);
 }

所以，改变触摸分发数组的机会只有一次，之后如果想动态的改变优先级需要获取TouchDispatcher后设置，或者类似menu可以调用现成的函数setHandlerPriority

解决：

            //设置层级
            CCTouchDispatcher* pDispatcher = CCDirector::sharedDirector()->getTouchDispatcher();
            pDispatcher->removeDelegate(m_pCtiyGateBtn);
            pDispatcher->addTargetedDelegate(m_pCtiyGateBtn,1000,true);

（编辑：李大同）

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