touch

 事件监听共有五种事件

• 触摸事件 (EventListenerTouch)  单点触摸 / 多点触摸
• 键盘响应事件 (EventListenerKeyboard)
• 响应加速器事件 (EventListenerAcceleration)
• 鼠标响应事件 (EventListenerMouse)
• 自定义事件 (EventListenerCustom)

touch
    /** returns the current touch location in OpenGL coordinates */
    Vec2 getLocation() const;//获取当前touch位置，该位置基于OpenGL坐标
    /** returns the previous touch location in OpenGL coordinates */
    Vec2 getPreviousLocation() const;//获取前一次touch位置，该位置基于OpenGL坐标
    /** returns the start touch location in OpenGL coordinates */
    Vec2 getStartLocation() const;//获取该touch的起始位置，该位置基于OpenGL坐标
    /** returns the delta of 2 current touches locations in screen coordinates */
    Vec2 getDelta() const;  //获取前后两次位置的偏移量，基于OpenGL坐标
    /** returns the current touch location in screen coordinates */
    Vec2 getLocationInView() const; //当前touch位置,该位置基于屏幕坐标位置
    /** returns the previous touch location in screen coordinates */
    Vec2 getPreviousLocationInView() const; //获取touch前一次的位置，基于屏幕坐标位置
    /** returns the start touch location in screen coordinates */
    Vec2 getStartLocationInView() const;  //获取touch起始位置，基于屏幕坐标位置

单点触摸 

/**
     创建一个触摸监听
     */
    auto myListener = EventListenerTouchOneByOne::create();   //单点触摸
// auto myListener = EventListenerTouchAllAtOnce::create(); //多点触摸
    
    myListener->setSwallowTouches(false);       //触摸穿透效果了, 是否想向下继续传递触摸
    
    myListener->onTouchBegan = [](Touch *touch, Event *event){
        auto target = static_cast<Sprite *>(event->getCurrentTarget());
        Point locationInNode = target->convertToNodeSpace(touch->getLocation()); //转化为节点坐标
        Size s = target->getContentSize();
        Rect rect = Rect(0, 0, s.width, s.height);
        if (rect.containsPoint(locationInNode)) {
            log("sprite begin.....x:%f, y:%f", locationInNode.x, locationInNode.y);
            target->setOpacity(180);
            return true;
        }
        return false;
    };
    
    myListener->onTouchMoved = [](Touch *touch, Event *event){
        auto target = static_cast<Sprite *>(event->getCurrentTarget());
        log("sprite moved.....x:%f, y:%f", touch->getLocation().x, touch->getLocation().y);
        /**
         getDelta()
         @return 获取前后两次位置的偏移量，基于OpenGL坐标
         */
        target->setPosition(target->getPosition() + touch->getDelta());
    };
    
    myListener->onTouchEnded = [](Touch *touch, Event *event){
        auto target = static_cast<Sprite *>(event->getCurrentTarget());
        target->setOpacity(255);
    };
    
    //添加监听器 _eventDispatcher 是node的属性,管理当前节点所有事件的分发
    //注意：当再次使用 myListener 的时候，需要使用clone()方法创建一个新的克隆，因为在使用addEventListenerWithSceneGraphPriority或者addEventListenerWithFixedPriority方法时，会对当前使用的事件监听器添加一个已注册的标记，这使得它不能够被添加多次。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
    _eventDispatcher->addEventListenerWithSceneGraphPriority(myListener, myCard[0]);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(myListener->clone(), myCard[1]);

 多点触摸

auto myListener = EventListenerTouchAllAtOnce::create();
    myListener->onTouchesBegan = [=](const std::vector<Touch *>&touches, Event *unused_event){
        for (auto &item:touches) {
            auto *sprite = Sprite::create("sprite.png");
            sprite->setPosition(item->getLocation());
            sprite->setOpacity(120);
            this->addChild(sprite);
        }
    };
    
    myListener->onTouchesMoved = [=](const std::vector<Touch *>&touches, Event *unused_event){
        for (auto &item:touches) {
            int id = item->getID();
            auto array = this->getChildren();
            auto sprite = array.at(id);
            auto point = item->getLocation();
            sprite->setPosition(point);
            log("id = %d	x= %f	y = %f", id, point.x, point.y);
        }
    };
    
    myListener->onTouchesEnded = [=](const std::vector<Touch *>touches, Event *unused_event){
        for (auto &item : touches) {
            int id = item->getID();
            auto array = this->getChildren();
            auto sprite = array.at(id);
            sprite->setOpacity(255);
            auto point = item->getLocation();
            sprite->setPosition(point);
            log("id = %d	x = %f	y = %f", id, point.x, point.y);
        }
    };
    _eventDispatcher->addEventListenerWithSceneGraphPriority(myListener, this);

鼠标 

auto myMouseListener = EventListenerMouse::create();
    myMouseListener->onMouseMove = [=](Event *event)
    {
        EventMouse* e = (EventMouse*)event;
        this->mouse->setPosition(e->getCursorX(), e->getCursorY() + visibleSize.height);
    };
    myMouseListener->onMouseDown = [=](Event *event)
    {
        this->mouse->setScale(0.2f);
    };
    myMouseListener->onMouseUp = [=](Event *event)
    {
        this->mouse->setScale(0.3f);
    };
    _eventDispatcher->addEventListenerWithSceneGraphPriority(myMouseListener, this);

键盘 

auto myKeyListener = EventListenerKeyboard::create();
    myKeyListener->onKeyPressed = [](EventKeyboard::KeyCode keycode, cocos2d::Event *event)
    {
        CCLOG("key is pressed,keycode is %d",keycode);
    };
    myKeyListener->onKeyReleased = [](EventKeyboard::KeyCode keycode, cocos2d::Event *event)
    {
        CCLOG("key is released,keycode is %d", keycode);
    };
    _eventDispatcher->addEventListenerWithSceneGraphPriority(myKeyListener, this);

加速器

    sprite = Sprite::create("sprite.png");
    sprite->setPosition(screenWidth/2, screenHeight/2);
    this->addChild(sprite);
    
    Device::setAccelerometerEnabled(true);
    auto listener = EventListenerAcceleration::create(CC_CALLBACK_2(NextScene::onAcceleration, this));
    _eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);

void NextScene::onAcceleration(Acceleration *acc, Event *event)
{
    auto point = this->sprite->getPosition();
    if (acc->x < 0 && point.x>0) {
        point.x--;
    }else if (acc->x > 0 && point.x>0){
        point.x++;
    }
    
    if (acc->y < 0 && point.x>0)
    {
        point.y--;
    }
    else if (acc->y > 0 && point.y<this->screenHeight)
    {
        point.y++;
    }
    
    if (acc->z<0 && this->scale>0.1)
    {
        this->scale = this->scale*0.9;
    }
    else if (acc->z>0 && this->scale < 10)
    {
        this->scale = this->scale*1.1;
    }
    this->sprite->setPosition(point);
    this->sprite->setScale(0.3*this->scale);
}