第六节：事件处理

单点触屏事件：

//先创建一个单点触屏监听器
auto listener = EventListenerTouchOneByOne::create();
//注册监听器的回调方法，分别回调本节点的三个方法
listener->onTouchBegan = CC_CALLBACK_2(EventScene::onTouchBegan, this);
listener->onTouchEnded = CC_CALLBACK_2(EventScene::onTouchEnded,this);
listener->onTouchMoved = CC_CALLBACK_2(EventScene::onTouchMoved, this);
//注册监听器
_eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);

//手势开始的时候执行
bool EventScene::onTouchBegan(cocos2d::Touch *touch, cocos2d::Event *unused_event)
{
//获取屏幕触控点
auto p = touch->getLocationInView();
//把点的转换为GL坐标
p = Director::getInstance()->convertToGL(p);
//在控制台输出点的坐标
CCLOG("[%f,%f]",p.x,p.y);
//如果返回false，就不再往下执行，后面的onTouchMoved和onTouchEnded就不会再执行
return true;
}
//滑动手势的时候执行
void EventScene::onTouchMoved(cocos2d::Touch *touch, cocos2d::Event *unused_event)
{
CCLOG("执行移动操作");
}
//手势结束的时候执行
void EventScene::onTouchEnded(cocos2d::Touch *touch, cocos2d::Event *unused_event)
{
CCLOG("手势结束了");
}

多点触屏事件：

//注册监听器的回调方法，分别回调本节点的三个方法
//与单点触控是不一样的方法
auto all_listener = EventListenerTouchAllAtOnce::create();
all_listener->onTouchesBegan = CC_CALLBACK_2(EventScene::onTouchesBegan, this);
all_listener->onTouchesMoved = CC_CALLBACK_2(EventScene::onTouchesMoved, this);
all_listener->onTouchesEnded = CC_CALLBACK_2(EventScene::onTouchesEnded, this);
//注册监听器
_eventDispatcher->addEventListenerWithSceneGraphPriority(all_listener, this);

void EventScene::onTouchesBegan(const std::vector<Touch *> &touches, cocos2d::Event *unused_event)
{
//从触控的多点中，取出一个触控点
auto t = touches[0];
//获取屏幕触控点
auto p = t->getLocationInView();
//把点的转换为GL坐标
p = Director::getInstance()->convertToGL(p);
//在控制台输出点的坐标
CCLOG("[%f,%f]",p.x,p.y);
}
void EventScene::onTouchesMoved(const std::vector<Touch *> &touches, cocos2d::Event *unused_event)
{
CCLOG("多点触控执行移动操作");
}
void EventScene::onTouchesEnded(const std::vector<Touch *> &touches, cocos2d::Event *unused_event)
{
CCLOG("多点触控手势结束了");
}

鼠标事件：

auto mouse_listener = EventListenerMouse::create();
mouse_listener->onMouseUp = CC_CALLBACK_1(EventScene::onMouseUp, this);
mouse_listener->onMouseDown = CC_CALLBACK_1(EventScene::onMouseDown, this);
mouse_listener->onMouseScroll = CC_CALLBACK_1(EventScene::onMouseScroll, this);
mouse_listener->onMouseMove = CC_CALLBACK_1(EventScene::onMouseMove, this);
_eventDispatcher->addEventListenerWithSceneGraphPriority(mouse_listener, this);

void EventScene::onMouseDown(cocos2d::Event *e)
{
EventMouse* em = (EventMouse*)e;
int b = em->getMouseButton();
CCLOG("你点击的是鼠标的%d",b);
}
void EventScene::onMouseMove(cocos2d::Event *e)
{
EventMouse* em = (EventMouse*)e;
CCLOG("鼠标移动的坐标[%f,%f]",em->getCursorX(),em->getCursorY());
}
void EventScene::onMouseScroll(cocos2d::Event *e)
{
EventMouse* em = (EventMouse*)e;
CCLOG("滑轮滚动的坐标[%f,%f]",em->getScrollX(),em->getScrollY());
}
void EventScene::onMouseUp(cocos2d::Event *e)
{
CCLOG("鼠标抬起");
}

键盘事件：

auto keyboard_listener = EventListenerKeyboard::create();
keyboard_listener->onKeyReleased = CC_CALLBACK_2(EventScene::onKeyReleased, this);
keyboard_listener->onKeyPressed = CC_CALLBACK_2(EventScene::onKeyPressed, this);
_eventDispatcher->addEventListenerWithSceneGraphPriority(keyboard_listener, this);

void EventScene::onKeyPressed(EventKeyboard::KeyCode keyCode, cocos2d::Event *event)
{
switch (keyCode) {
case cocos2d::EventKeyboard::KeyCode::KEY_UP_ARROW:
CCLOG("UP...");
break;
case cocos2d::EventKeyboard::KeyCode::KEY_DOWN_ARROW:
CCLOG("DOWN...");
break;
case cocos2d::EventKeyboard::KeyCode::KEY_RIGHT_ARROW:
CCLOG("RIGHT...");
break;
case cocos2d::EventKeyboard::KeyCode::KEY_LEFT_ARROW:
CCLOG("LEFT...");
break;
}
}
void EventScene::onKeyReleased(EventKeyboard::KeyCode keyCode, cocos2d::Event *event)
{

}

加速度事件：

//首先，要打开加速度传感器
Device::setAccelerometerEnabled(true);
//创建一个加速度传感器监听器，参数是一个回调
auto acceler_listener = EventListenerAcceleration::create(CC_CALLBACK_2(EventScene::onAcceleration, this));
//注册监听器
_eventDispatcher->addEventListenerWithSceneGraphPriority(acceler_listener,this);

void EventScene::onAcceleration(cocos2d::Acceleration *acc, cocos2d::Event *unused_event)
{
//分别获取x,y,z方向上的加速度
float x = acc->x;
float y = acc->y;
float z = acc->z;
}