Cocos2dx3.0 回调函数写法

转自 ---http://blog.sina.com.cn/s/blog_6d193c030101h40e.html

一、按钮回调

1. Lambda 表达式，C++11 Lambda 赋予了Cocos2d-x 3.0创建回调函数的灵活性。

[cpp]

1. auto itemNor    =   Sprite::create("CloseNormal.png");  
2. auto menuItem   =   MenuItemSprite::create(itemNor,nullptr,nullptr,[](Ref* sender)  
3. {  
4.     log("show this msg.");  
5. });  
6. auto menu   =   Menu::create(menuItem,nullptr);  
7. this->addChild(menu);  

2.宏定义bind方式创建回调.

[cpp] 

1. auto itemNor    =   Sprite::create("CloseNormal.png");  
2. auto menuItem   =   MenuItemSprite::create(itemNor,nullptr,nullptr,CC_CALLBACK_1(HelloWorld::menuCloseCallback,this));  
3. auto menu   =   Menu::create(menuItem,nullptr);  
4. this->addChild(menu);  
5.   
6. void HelloWorld::menuCloseCallback(Ref* pSender)  
7. {  
8.     log("show this msg.");  
9. }  

3.MenuToggleItem回事件回调

[cpp] 

1. auto toggleSpNor    =   Label::createWithSystemFont("OPEN_BAME","WRYH",65);  
2. auto toggleSpSel    =   Label::createWithSystemFont("CLOSE_BAME","WRYH",65);  
3. auto toggleSpDis    =   Label::createWithSystemFont("DISABLE_BAME","WRYH",65);  
4. auto toggleItemNor  =   MenuItemLabel::create(toggleSpNor);  
5. auto toggleItemSel  =   MenuItemLabel::create(toggleSpSel);  
6. auto toggleItemDis  =   MenuItemLabel::create(toggleSpDis);  
7.   
8. auto toggleItem     =   MenuItemToggle::createWithCallback(CC_CALLBACK_0(HelloWorld::toggleCallBack,this),toggleItemNor,toggleItemSel,nullptr);  
9.   
10. auto toggleMenu =   Menu::create(toggleItem,nullptr);  
11. this->addChild(toggleMenu);  
12.   
13. void HelloWorld::toggleCallBack()  
14. {  
15.     log("Do something when toggle did touched..");  
16. }  

二、定时器回调

[cpp] view plaincopy

1.   
2. this->schedule(SEL_SCHEDULE(&HelloWorld::gameStep));  
3.   
4. this->scheduleOnce(SEL_SCHEDULE(&HelloWorld::gameStep),3.0f);\  
5.   
6. this->scheduleUpdate();  
7.   
8. void HelloWorld::gameStep(float dt)  
9. {  
10.     log("on timer...");  
11. }  

三、触屏事件回调

[cpp] view plaincopy

1. auto touchEvt           =   cocos2d::EventListenerTouchOneByOne::create();  
2. touchEvt->onTouchBegan       =   CC_CALLBACK_2(HelloWorld::onTouchBegan,this);  
3. touchEvt->onTouchMoved       =   CC_CALLBACK_2(HelloWorld::onTouchMoved,this);  
4. touchEvt->onTouchEnded      =    CC_CALLBACK_2(HelloWorld::onTouchEnded,this);  
5. touchEvt->onTouchCancelled     = CC_CALLBACK_2(HelloWorld::onTouchCancelled,this);  
6.   
7. Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(touchEvt,this);  
8.   
9. bool HelloWorld::onTouchBegan(cocos2d::Touch* touch,cocos2d::Event* evt)  
10. {  
11.     log("Touch began..");  
12.     return true;  
13. }  
14. void HelloWorld::onTouchMoved(cocos2d::Touch* touch,cocos2d::Event* evt)  
15. {  
16.     log("Touch moved..");  
17. }  
18. void HelloWorld::onTouchEnded(cocos2d::Touch* touch,cocos2d::Event* evt)  
19. {  
20.     log("Touch leave..");  
21.     Director::getInstance()->getEventDispatcher()->removeEventListenersForTarget(this);  
22. }  
23. void HelloWorld::onTouchCancelled(cocos2d::Touch* touch,cocos2d::Event* evt)  
24. {  
25.     log("Something was happend , touch event is cut..");  
26. }  

四、动作回调

[cpp] view plaincopy

1. auto callBack       =   CallFunc::create(CC_CALLBACK_0(HelloWorld::actionCallBack,this));  
2. this->runAction(callBack);  
3.   
4. void HelloWorld::actionCallBack()  
5. {  
6.     log("Do something when action did finished..");  
7. }  

五、自定义事件回调

[cpp] view plaincopy

1. auto callBack       =   [](EventCustom* evt)  
2.                             {  
3.                                 log("catch an custom event!!");  
4.                             };  
5. cocos2d::EventListenerCustom* customEvt =   EventListenerCustom::create("ME_CUSTOM_EVENT_TEST",callBack);  
6. //注册自定义事件（处理优先级为12）  
7. Director::getInstance()->getEventDispatcher()->addEventListenerWithFixedPriority(customEvt,12);  
8.   
9. //抛出自定义事件  
10. Director::getInstance()->getEventDispatcher()->dispatchCustomEvent("ME_CUSTOM_EVENT_TEST");