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：
EventListenerTouch 响应触控事件
EventListenerKeyboard 响应键盘事件
EventListenerAcceleration 响应加速器事件
EventListenMouse 响应鼠标事件
EventListenerCustom 响应自定义的事件

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：
　　_eventDispatcher是Node的属性，通过它管理当前节点（场景、层、精灵等）的所有事件的分发。但它本身是一个单例模式值的引用，在Node的构造函数中，通过Director::getInstance()->getEventDispatcher(); 获取，有了这个属性，就能方便的处理事件。

触摸事件：

　　

  1. void EventDispatcherTest::funEventTouch(Sprite* sprite)
  2. {
  3.     this->_eventDispatcher->removeAllEventListeners();
  4.  
  5.     auto listener = EventListenerTouchOneByOne::create();
  6.     listener->onTouchBegan = CC_CALLBACK_2(EventDispatcherTest::onTouchBeganss,this);
  7.     listener->onTouchMoved = CC_CALLBACK_2(EventDispatcherTest::onTouchMovedss,this);
  8.     listener->onTouchEnded = CC_CALLBACK_2(EventDispatcherTest::onTouchEndedss,this);
  9.     listener->onTouchCancelled = CC_CALLBACK_2(EventDispatcherTest::onTouchCancelledss,this);
  10.     listener->setSwallowTouches(true);//是否向下传递
  11.     this->_eventDispatcher->addEventListenerWithSceneGraphPriority(listener,sprite);
  12. }
  13.  
  14. bool EventDispatcherTest::onTouchBeganss(Touch* touch,Event* ev)
  15. {
  16.     auto target = static_cast<Sprite*>(ev->getCurrentTarget());
  17.  
  18.     Vec2 locationInNode = target->convertToNodeSpace(touch->getLocation());
  19.     Size s = target->getContentSize();
  20.     Rect rect = Rect(, , s.width, s.height);
  21. 　　//判断触摸区域是否在目标上
  22.     if (rect.containsPoint(locationInNode))
  23.     {
  24.         label->setString("onTouchBegan......");
  25.         target->setOpacity();
  26.         return true;
  27.     }
  28.     return false;
  29. }
  30. void EventDispatcherTest::onTouchMovedss(Touch* touch,Event* ev)
  31. {
  32.     auto target = static_cast<Sprite*>(ev->getCurrentTarget());
  33.     target->setPosition(target->getPosition() + touch->getDelta());
  34.     label->setString("onTouchMoved......");
  35. }
  36. void EventDispatcherTest::onTouchEndedss(Touch* touch,Event* ev)
  37. {
  38.     auto target = static_cast<Sprite*>(ev->getCurrentTarget());
  39.     target->setOpacity();
  40.     label->setString("onTouchEnded......");
  41. }
  42. void EventDispatcherTest::onTouchCancelledss(Touch* touch,Event* ev)
  43. {
  44.     label->setString("onTouchCancelled......");
  45. }

键盘事件

  1. void EventDispatcherTest::funEventKeyboard()
  2. {
  3.     this->_eventDispatcher->removeAllEventListeners();
  4.  
  5.     auto listener = EventListenerKeyboard::create();
  6.     listener->onKeyPressed = CC_CALLBACK_2(EventDispatcherTest::onKeyPressedss,this);
  7.     listener->onKeyReleased = CC_CALLBACK_2(EventDispatcherTest::onKeyReleasedss,this);
  8.     this->_eventDispatcher->addEventListenerWithSceneGraphPriority(listener,this);
  9. }
  10.  
  11. void EventDispatcherTest::onKeyPressedss(EventKeyboard::KeyCode keycode,Event* ev)
  12. {
  13.     char txt[] = {};
  14.     sprintf_s(txt,"key %d is Pressed!",(int)keycode);
  15.     label->setString(txt);
  16. }
  17.  
  18. void EventDispatcherTest::onKeyReleasedss(EventKeyboard::KeyCode keycode,Event* ev)
  19. {
  20.     label->setString("key is Released!");
  21. }

鼠标事件

  1. void EventDispatcherTest::funEventMouse(Sprite* sprite)
  2. {
  3.     this->_eventDispatcher->removeAllEventListeners();
  4.  
  5.     auto listener = EventListenerMouse::create();
  6.     listener->onMouseDown = CC_CALLBACK_1(EventDispatcherTest::onMouseDownss,this);
  7.     listener->onMouseMove = CC_CALLBACK_1(EventDispatcherTest::onMouseMovess,this);
  8.     listener->onMouseUp = CC_CALLBACK_1(EventDispatcherTest::onMouseUpss,this);
  9.     listener->onMouseScroll = CC_CALLBACK_1(EventDispatcherTest::onMouseScrollss,this);
  10.     this->_eventDispatcher->addEventListenerWithSceneGraphPriority(listener,sprite);
  11. }
  12.  
  13. void EventDispatcherTest::onMouseDownss(Event* ev)
  14. {
  15.     label->setString("onMouseDown!");
  16. }
  17. void EventDispatcherTest::onMouseMovess(Event* ev)
  18. {
  19.     label->setString("onMouseMove!");
  20. }
  21. void EventDispatcherTest::onMouseUpss(Event* ev)
  22. {
  23.     label->setString("onMouseUp!");
  24. }
  25. void EventDispatcherTest::onMouseScrollss(Event* ev)
  26. {
  27.     label->setString("onMouseScroll!");
  28. }

自定义事件

　　

  1. //自定義事件
  2.      funEventCustom();
  3.      //2秒後派發一次自定義事件，測試
  4.      scheduleOnce(schedule_selector(EventDispatcherTest::dispatcherCustomEvents),2.0f);
  1. void EventDispatcherTest::funEventCustom()
  2. {
  3.     auto listener = EventListenerCustom::create("custom_event_1",CC_CALLBACK_1(EventDispatcherTest::onEventCustom,this));
  4.     this->_eventDispatcher->addEventListenerWithFixedPriority(listener,);//添加到事件分發器
  5. }
  6.  
  7. void EventDispatcherTest::dispatcherCustomEvents(float at)
  8. {
  9.     //派發事件custom_event_1  事件內容為字符串custom event test!
  10.     this->_eventDispatcher->dispatchCustomEvent("custom_event_1","custom event test!");
  11. }
  12.  
  13. void EventDispatcherTest::onEventCustom(EventCustom* event)
  14. {
  15.     auto data = static_cast<char*>(event->getUserData());
  16.     label->setString(data);
  17. }

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。

  1. void EventDispatcherTest::funEventAcceleration()
  2. {
  3.     //啟動硬件設備
  4.     Device::setAccelerometerEnabled(true); 
  5.  
  6.     auto listener = EventListenerAcceleration::create(CC_CALLBACK_2(EventDispatcherTest::onAcceleration,this));
  7.     this->_eventDispatcher->addEventListenerWithSceneGraphPriority(listener,this);
  8. }
  9.  
  10. void EventDispatcherTest::onAcceleration(Acceleration* acc,Event* event)
  11. {
  12.     char str[]={};
  13.     sprintf_s(str,"x:%2d,y:%2d,z:%2d,timestamp:%2d",acc->x,acc->y,acc->z,acc->timestamp);
  14.     log(str);
  15. }

示例代码

  1. #ifndef __EventDispatcherTest__
  2. #define __EventDispatcherTest__
  3.  
  4. #include "cocos2d.h"
  5.  
  6. USING_NS_CC;
  7.  
  8. class EventDispatcherTest : public Layer
  9. {
  10. public:
  11.     CREATE_FUNC(EventDispatcherTest);
  12.     virtual bool init();
  13.     static Scene* createScene();
  14.     LabelTTF* label;
  15.     void funEventTouch(Sprite* sprite);
  16.     void funEventKeyboard();
  17.     void funEventMouse(Sprite* sprite);
  18.     void funEventCustom();
  19.     void funEventAcceleration();
  20.  
  21.     bool onTouchBeganss(Touch* touch,Event* ev);
  22.     void onTouchMovedss(Touch* touch,Event* ev);
  23.     void onTouchEndedss(Touch* touch,Event* ev);
  24.     void onTouchCancelledss(Touch* touch,Event* ev);
  25.  
  26.     void onKeyPressedss(EventKeyboard::KeyCode keycode,Event* ev);
  27.     void onKeyReleasedss(EventKeyboard::KeyCode keycode,Event* ev);
  28.  
  29.     void onMouseDownss(Event* ev);
  30.     void onMouseMovess(Event* ev);
  31.     void onMouseUpss(Event* ev);
  32.     void onMouseScrollss(Event* ev);
  33.  
  34.     void dispatcherCustomEvents(float at);
  35.     void onEventCustom(EventCustom* event);
  36.  
  37.     void onAcceleration(Acceleration* acc,Event* event);
  38. };
  39.  
  40. #endif

EventDispatcherTest.h

  1. #include "EventDispatcherTest.h"
  2. Scene* EventDispatcherTest::createScene()
  3. {
  4.     auto scene = Scene::create();
  5.     auto layer = EventDispatcherTest::create();
  6.     scene->addChild(layer);
  7.     return scene;
  8. }
  9.  
  10. bool EventDispatcherTest::init()
  11. {
  12.  
  13.     Size visibleSize = Director::getInstance()->getVisibleSize();
  14.     Vec2 origin = Director::getInstance()->getVisibleOrigin();
  15.     label = LabelTTF::create("Hello World", "Arial", );
  16.     label->setPosition(Vec2(origin.x + visibleSize.width/,
  17.         origin.y + visibleSize.height - label->getContentSize().height));
  18.     this->addChild(label, );
  19.  
  20.     auto sprite = Sprite::create("MagentaSquare.png",Rect(,,,));
  21.     sprite->setPosition(visibleSize/);
  22.     this->addChild(sprite);
  23.  
  24.     //funEventTouch(sprite); //觸摸事件
  25.     //funEventKeyboard();    //鍵盤事件
  26.     //funEventMouse(sprite);//鼠標事件
  27.     //funEventAcceleration();//加速器事件
  28.  
  29.     //自定義事件
  30.      funEventCustom();
  31.      //2秒後派發一次自定義事件，測試
  32.      scheduleOnce(schedule_selector(EventDispatcherTest::dispatcherCustomEvents),2.0f);
  33.     return true;
  34. }
  35.  
  36. void EventDispatcherTest::funEventTouch(Sprite* sprite)
  37. {
  38.     this->_eventDispatcher->removeAllEventListeners();
  39.  
  40.     auto listener = EventListenerTouchOneByOne::create();
  41.     listener->onTouchBegan = CC_CALLBACK_2(EventDispatcherTest::onTouchBeganss,this);
  42.     listener->onTouchMoved = CC_CALLBACK_2(EventDispatcherTest::onTouchMovedss,this);
  43.     listener->onTouchEnded = CC_CALLBACK_2(EventDispatcherTest::onTouchEndedss,this);
  44.     listener->onTouchCancelled = CC_CALLBACK_2(EventDispatcherTest::onTouchCancelledss,this);
  45.     listener->setSwallowTouches(true);//是否向下传递
  46.     this->_eventDispatcher->addEventListenerWithSceneGraphPriority(listener,sprite);
  47. }
  48.  
  49. bool EventDispatcherTest::onTouchBeganss(Touch* touch,Event* ev)
  50. {
  51.     auto target = static_cast<Sprite*>(ev->getCurrentTarget());
  52.  
  53.     Vec2 locationInNode = target->convertToNodeSpace(touch->getLocation());
  54.     Size s = target->getContentSize();
  55.     Rect rect = Rect(, , s.width, s.height);
  56.  
  57.     if (rect.containsPoint(locationInNode))
  58.     {
  59.         label->setString("onTouchBegan......");
  60.         target->setOpacity();
  61.         return true;
  62.     }
  63.     return false;
  64. }
  65. void EventDispatcherTest::onTouchMovedss(Touch* touch,Event* ev)
  66. {
  67.     auto target = static_cast<Sprite*>(ev->getCurrentTarget());
  68.     target->setPosition(target->getPosition() + touch->getDelta());
  69.     label->setString("onTouchMoved......");
  70. }
  71. void EventDispatcherTest::onTouchEndedss(Touch* touch,Event* ev)
  72. {
  73.     auto target = static_cast<Sprite*>(ev->getCurrentTarget());
  74.     target->setOpacity();
  75.     label->setString("onTouchEnded......");
  76. }
  77. void EventDispatcherTest::onTouchCancelledss(Touch* touch,Event* ev)
  78. {
  79.     label->setString("onTouchCancelled......");
  80. }
  81.  
  82. void EventDispatcherTest::funEventKeyboard()
  83. {
  84.     this->_eventDispatcher->removeAllEventListeners();
  85.  
  86.     auto listener = EventListenerKeyboard::create();
  87.     listener->onKeyPressed = CC_CALLBACK_2(EventDispatcherTest::onKeyPressedss,this);
  88.     listener->onKeyReleased = CC_CALLBACK_2(EventDispatcherTest::onKeyReleasedss,this);
  89.     this->_eventDispatcher->addEventListenerWithSceneGraphPriority(listener,this);
  90. }
  91.  
  92. void EventDispatcherTest::onKeyPressedss(EventKeyboard::KeyCode keycode,Event* ev)
  93. {
  94.     char txt[] = {};
  95.     sprintf_s(txt,"key %d is Pressed!",(int)keycode);
  96.     label->setString(txt);
  97. }
  98.  
  99. void EventDispatcherTest::onKeyReleasedss(EventKeyboard::KeyCode keycode,Event* ev)
  100. {
  101.     label->setString("key is Released!");
  102. }
  103.  
  104. void EventDispatcherTest::funEventMouse(Sprite* sprite)
  105. {
  106.     this->_eventDispatcher->removeAllEventListeners();
  107.  
  108.     auto listener = EventListenerMouse::create();
  109.     listener->onMouseDown = CC_CALLBACK_1(EventDispatcherTest::onMouseDownss,this);
  110.     listener->onMouseMove = CC_CALLBACK_1(EventDispatcherTest::onMouseMovess,this);
  111.     listener->onMouseUp = CC_CALLBACK_1(EventDispatcherTest::onMouseUpss,this);
  112.     listener->onMouseScroll = CC_CALLBACK_1(EventDispatcherTest::onMouseScrollss,this);
  113.     this->_eventDispatcher->addEventListenerWithSceneGraphPriority(listener,sprite);
  114. }
  115.  
  116. void EventDispatcherTest::onMouseDownss(Event* ev)
  117. {
  118.     label->setString("onMouseDown!");
  119. }
  120. void EventDispatcherTest::onMouseMovess(Event* ev)
  121. {
  122.     label->setString("onMouseMove!");
  123. }
  124. void EventDispatcherTest::onMouseUpss(Event* ev)
  125. {
  126.     label->setString("onMouseUp!");
  127. }
  128. void EventDispatcherTest::onMouseScrollss(Event* ev)
  129. {
  130.     label->setString("onMouseScroll!");
  131. }
  132.  
  133. void EventDispatcherTest::funEventCustom()
  134. {
  135.     auto listener = EventListenerCustom::create("custom_event_1",CC_CALLBACK_1(EventDispatcherTest::onEventCustom,this));
  136.     this->_eventDispatcher->addEventListenerWithFixedPriority(listener,);//添加到事件分發器
  137. }
  138.  
  139. void EventDispatcherTest::dispatcherCustomEvents(float at)
  140. {
  141.     //派發事件custom_event_1  事件內容為字符串custom event test!
  142.     this->_eventDispatcher->dispatchCustomEvent("custom_event_1","custom event test!");
  143. }
  144.  
  145. void EventDispatcherTest::onEventCustom(EventCustom* event)
  146. {
  147.     auto data = static_cast<char*>(event->getUserData());
  148.     label->setString(data);
  149. }
  150.  
  151. void EventDispatcherTest::funEventAcceleration()
  152. {
  153.     //啟動硬件設備
  154.     Device::setAccelerometerEnabled(true); 
  155.  
  156.     auto listener = EventListenerAcceleration::create(CC_CALLBACK_2(EventDispatcherTest::onAcceleration,this));
  157.     this->_eventDispatcher->addEventListenerWithSceneGraphPriority(listener,this);
  158. }
  159.  
  160. void EventDispatcherTest::onAcceleration(Acceleration* acc,Event* event)
  161. {
  162.     char str[]={};
  163.     sprintf_s(str,"x:%2d,y:%2d,z:%2d,timestamp:%2d",acc->x,acc->y,acc->z,acc->timestamp);
  164.     log(str);
  165. }

EventDispatcherTest.cpp

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