EventDispatcher事件分发机制先创建事件，注册到事件管理中心_eventDispatcher，通过发布事件得到响应进行回调，完成事件流。

有五种不同的事件机制：

优先权：

　　1.优先级越低，越先响应事件

　　2.如果优先级相同，则上层的（z轴）先接收触摸事件。

事件监听器的优先级：

　　 1.addEventListenerWithSceneGraphPriority 的事件监听器优先级是0，而且在 addEventListenerWithFixedPriority 中的事件监听器的优先级不可以设置为 0，因为这个是保留给 SceneGraphPriority 使用的。

　　2.另外，有一点非常重 要，FixedPriority listener添加完之后需要手动remove，而SceneGraphPriority listener是跟node绑定的，在node的析构函数中会被移除。移除方 法：dispatcher->removeEventListener(listener);

事件管理单例获取：

触摸事件：

void EventDispatcherTest::funEventTouch(Sprite* sprite){    this->_eventDispatcher->removeAllEventListeners();        auto listener = EventListenerTouchOneByOne::create();    listener->onTouchBegan = CC_CALLBACK_2(EventDispatcherTest::onTouchBeganss,this);    listener->onTouchMoved = CC_CALLBACK_2(EventDispatcherTest::onTouchMovedss,this);    listener->onTouchEnded = CC_CALLBACK_2(EventDispatcherTest::onTouchEndedss,this);    listener->onTouchCancelled = CC_CALLBACK_2(EventDispatcherTest::onTouchCancelledss,this);    listener->setSwallowTouches(true);//是否向下传递    this->_eventDispatcher->addEventListenerWithSceneGraphPriority(listener,sprite);}bool EventDispatcherTest::onTouchBeganss(Touch* touch,Event* ev){    auto target = static_cast
     
      (ev->getCurrentTarget());    Vec2 locationInNode = target->convertToNodeSpace(touch->getLocation());    Size s = target->getContentSize();    Rect rect = Rect(0, 0, s.width, s.height);　　//判断触摸区域是否在目标上    if (rect.containsPoint(locationInNode))    {        label->setString("onTouchBegan......");        target->setOpacity(180);        return true;    }    return false;}void EventDispatcherTest::onTouchMovedss(Touch* touch,Event* ev){    auto target = static_cast
      
       (ev->getCurrentTarget());    target->setPosition(target->getPosition() + touch->getDelta());    label->setString("onTouchMoved......");}void EventDispatcherTest::onTouchEndedss(Touch* touch,Event* ev){    auto target = static_cast
       
        (ev->getCurrentTarget());    target->setOpacity(255);    label->setString("onTouchEnded......");}void EventDispatcherTest::onTouchCancelledss(Touch* touch,Event* ev){    label->setString("onTouchCancelled......");}
       
      
     

键盘事件

void EventDispatcherTest::funEventKeyboard(){    this->_eventDispatcher->removeAllEventListeners();    auto listener = EventListenerKeyboard::create();    listener->onKeyPressed = CC_CALLBACK_2(EventDispatcherTest::onKeyPressedss,this);    listener->onKeyReleased = CC_CALLBACK_2(EventDispatcherTest::onKeyReleasedss,this);    this->_eventDispatcher->addEventListenerWithSceneGraphPriority(listener,this);}void EventDispatcherTest::onKeyPressedss(EventKeyboard::KeyCode keycode,Event* ev){    char txt[100] = {};    sprintf_s(txt,"key %d is Pressed!",(int)keycode);    label->setString(txt);}void EventDispatcherTest::onKeyReleasedss(EventKeyboard::KeyCode keycode,Event* ev){    label->setString("key is Released!");}

鼠标事件

void EventDispatcherTest::funEventMouse(Sprite* sprite){    this->_eventDispatcher->removeAllEventListeners();    auto listener = EventListenerMouse::create();    listener->onMouseDown = CC_CALLBACK_1(EventDispatcherTest::onMouseDownss,this);    listener->onMouseMove = CC_CALLBACK_1(EventDispatcherTest::onMouseMovess,this);    listener->onMouseUp = CC_CALLBACK_1(EventDispatcherTest::onMouseUpss,this);    listener->onMouseScroll = CC_CALLBACK_1(EventDispatcherTest::onMouseScrollss,this);    this->_eventDispatcher->addEventListenerWithSceneGraphPriority(listener,sprite);}void EventDispatcherTest::onMouseDownss(Event* ev){    label->setString("onMouseDown!");}void EventDispatcherTest::onMouseMovess(Event* ev){    label->setString("onMouseMove!");}void EventDispatcherTest::onMouseUpss(Event* ev){    label->setString("onMouseUp!");}void EventDispatcherTest::onMouseScrollss(Event* ev){    label->setString("onMouseScroll!");}

自定义事件

//自定義事件     funEventCustom();     //2秒後派發一次自定義事件，測試     scheduleOnce(schedule_selector(EventDispatcherTest::dispatcherCustomEvents),2.0f);

void EventDispatcherTest::funEventCustom(){    auto listener = EventListenerCustom::create("custom_event_1",CC_CALLBACK_1(EventDispatcherTest::onEventCustom,this));    this->_eventDispatcher->addEventListenerWithFixedPriority(listener,1);//添加到事件分發器}void EventDispatcherTest::dispatcherCustomEvents(float at){    //派發事件custom_event_1  事件內容為字符串custom event test!    this->_eventDispatcher->dispatchCustomEvent("custom_event_1","custom event test!");}void EventDispatcherTest::onEventCustom(EventCustom* event){    auto data = static_cast
     
      (event->getUserData());    label->setString(data);}
     

加速器事件

　　除了触摸，移动设备上一个很重要的输入源是设备的方向，因此大多数设备都配备了加速计，用于测量设备静止或匀速运动时所受到的重力方向。

重力感应来自移动设备的加速计，通常支持X,Y和Z三个方向的加速度感应，所以又称为三向加速计。在实际应用中，可以根据3个方向的力度大小来计算手机倾斜的角度或方向。

加速计监听器EventListenerAcceleration，其静态create方法中有个Acceleration的参数。Acceleration是一个类，包含了加速计获得的3个方向的加速度。

void EventDispatcherTest::funEventAcceleration(){    //啟動硬件設備    Device::setAccelerometerEnabled(true);     auto listener = EventListenerAcceleration::create(CC_CALLBACK_2(EventDispatcherTest::onAcceleration,this));    this->_eventDispatcher->addEventListenerWithSceneGraphPriority(listener,this);}void EventDispatcherTest::onAcceleration(Acceleration* acc,Event* event){    char str[100]={};    sprintf_s(str,"x:%2d,y:%2d,z:%2d,timestamp:%2d",acc->x,acc->y,acc->z,acc->timestamp);    log(str);}