registerWithTouchDispatcher注册触屏事件

1、注册触屏事件registerWithTouchDispatcher

CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate();

addTargetedDelegate()主要用于单点触控

     virtual void ccTouchesBegan(CCSet *pTouches, CCEvent *pEvent)   处理用户按下事件

     virtual void ccTouchesMoved(CCSet *pTouches, CCEvent *pEvent)   处理Touch Move 事件

    virtual void ccTouchesEnded(CCSet *pTouches, CCEvent *pEvent)    处理用户放开事件

    virtual void ccTouchesCancelled(CCSet *pTouches, CCEvent *pEvent)  处理Touch被打断事件&＃xff0c;如来电话了。

下面是源码&＃xff1a;

void CCTouchDispatcher::addStandardDelegate(CCTouchDelegate *pDelegate, int nPriority)//参数列表&＃xff08;标准委托&＃xff0c;优先级&＃xff09;
{
CCTouchHandler *pHandler &＃61; CCStandardTouchHandler::handlerWithDelegate(pDelegate, nPriority);
if (! m_bLocked)
{
forceAddHandler(pHandler, m_pStandardHandlers);
}
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;
}
m_pHandlersToAdd->addObject(pHandler);
m_bToAdd &＃61; true;
}
}

CCDirector::sharedDirector()->getTouchDispatcher()->addStandardDelegate()

addStandardDelegate()主要用于多点触控

      virtual bool ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent)       处理用户按下事件&＃xff0c;若用户需要继续处理该按下对应的后续事件&＃xff0c;则return true, 否则&＃xff0c;return false.

     virtual void ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent)       处理Touch Move 事件

     virtual void ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent)        处理用户放开事件

     virtual void ccTouchCancelled(CCTouch *pTouch, CCEvent *pEvent)   处理Touch被打断事件.

的源码&＃xff1a;

void CCTouchDispatcher::addTargetedDelegate(CCTouchDelegate *pDelegate, int nPriority, bool bSwallowsTouches)&＃xff08;&＃xff09;
{
CCTouchHandler *pHandler &＃61; 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;
}
m_pHandlersToAdd->addObject(pHandler);
m_bToAdd &＃61; true;
}
}

二者的区别在于

第一&＃xff0c;CCTargetedTouchDelegate 回调里的参数接收的不是Touch事件及集合(CCSet)&＃xff0c;而是单个的Touch事件&＃xff0c;cocos2d-x会将多点触摸拆散成单个的Touch事件再进行回调。

第二&＃xff0c;用户必须实现ccTouchBegan 函数&＃xff0c;且如果某个用户按下消息需要继续跟踪&＃xff0c;则ccTouchBegin返回true, 否则&＃xff0c;ccTouchMove等接口不会被调用到。

第三&＃xff0c;用户在注册TargetTouchDelegate的时候可以设置bSwallowsTouches标识&＃xff0c;若某个TargetTouchDelegate将该标识设为true&＃xff0c;且需要处理某个Touch事件&＃xff08;ccTouchBegan返回true&＃xff09;&＃xff0c;则调到该Delegate之后cocos2d-x不会将Touch消息发送给其他的TargetTouchDelegate和StandardTouchDelegate。

PS: CCLayer的默认registerWithTouchDispatcher实现是注册为CCStandardTouchDelegate, 另外&＃xff0c;在调用的时候不能自己调用registerWithTouchDispatcher,而应该调用setIsTouchEnable(true/false).