1、
添加单点触摸事件，单点触摸事件有优先级，bSwallowsTouches是否吞噬，高优先级的
会优先响应，而且可以吞噬事件，不让触摸事件往低优先级传递。
void CCTouchDispatcher::addTargetedDelegate(CCTouchDelegate *pDelegate,int nPriority,bool bSwallowsTouches)
{    
    CCTouchHandler *pHandler = CCTargetedTouchHandler::handlerWithDelegate(pDelegate,nPriority,bSwallowsTouches);
    if (! m_bLocked)
    {
        forceAddHandler(pHandler,m_pTargetedHandlers);
    }
    else
    {
        /* If pHandler is contained in m_pHandlersToRemove,if so remove it from m_pHandlersToRemove and return.
         * Refer issue #752(cocos2d-x)
         */
        if (ccCArrayContainsValue(m_pHandlersToRemove,pDelegate))
        {
            ccCArrayRemoveValue(m_pHandlersToRemove,pDelegate);
            return;
        }
        //CCArray* m_pHandlersToAdd这个可以理解为一个临时保存CCTouchHandler的地方，
	//m_bLocked 如果这个值为true，这把CCTouchHandler先加入到m_pHandlersToAdd，
	//然后在合适的时间，即CCTouchDispatcher::touches函数中，再把m_pHandlersToAdd数组里面
	//CCTouchHandler加入到m_pTargetedHandlers或者m_pStandardHandlers中。
        m_pHandlersToAdd->addObject(pHandler);
        m_bToAdd = true;
    }
}

-->>
//
// handlers management根据优先级进行排序，然后添加到单点触摸事件列表中,由此可知，
//值越小，优先级越高
//
void CCTouchDispatcher::forceAddHandler(CCTouchHandler *pHandler,CCArray *pArray)
{
    unsigned int u = 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);
}

2、移除：和加入类似
void CCTouchDispatcher::removeDelegate(CCTouchDelegate *pDelegate)
{
    if (pDelegate == NULL)
    {
        return;
    }

    if (! m_bLocked)
    {
        forceRemoveDelegate(pDelegate);
    }
    else
    {
        /* If pHandler is contained in m_pHandlersToAdd,if so remove it from m_pHandlersToAdd and return.
         * Refer issue #752(cocos2d-x)
         */
        CCTouchHandler *pHandler = findHandler(m_pHandlersToAdd,pDelegate);
        if (pHandler)
        {
            m_pHandlersToAdd->removeObject(pHandler);
            return;
        }

        ccCArrayAppendValue(m_pHandlersToRemove,pDelegate);
        m_bToRemove = true;
    }
}

-->>
void CCTouchDispatcher::removeDelegate(CCTouchDelegate *pDelegate)
{
    if (pDelegate == NULL)
    {
        return;
    }

    if (! m_bLocked)
    {
        forceRemoveDelegate(pDelegate);
    }
    else
    {
        /* If pHandler is contained in m_pHandlersToAdd,pDelegate);
        m_bToRemove = true;
    }
}