Question

我有一个包含许多精灵的ui :: ScrollView。

我创建了每个sprite，并通过执行以下操作为每个sprite添加了一个触摸侦听器：

for(int i=0; i < 5; i++){
    Sprite* foo = Sprite::createWithSpriteFrameName("foo");
    myScrollView->addChild(foo);

    auto listener = EventListenerTouchOneByOne::create();
    listener->onTouchBegan = [this,somestring](Touch* touch, Event* event){
        ......some code
    };
    listener->onTouchMoved = [foo,this,somestring](Touch* touch, Event* event){
        ......some code
    };
    listener->onTouchEnded = [foo,this,somestring](Touch* touch, Event* event){
        ......some code
    };
 foo->getEventDispatcher->addEventListenerWithSceneGraphPriority(listener1,foo);
}

问题是，如果我点击屏幕上的ANYWHERE，它似乎会触发循环中创建的所有精灵的触摸事件。我是如何创建监听器的，或者是否与ui :: ScrollView中的触摸有冲突？

我正在使用v 3.10

Answer 1

因为这就是TouchListener在cocos2d-x中的工作方式。除非有人吞下触摸事件，否则将调用所有触摸侦听器。你的代码是：

auto touchSwallower = EventListenerTouchOneByOne::create();
touchSwallower ->setSwallowed(true);
touchSwallower->onTouchBegan = [](){ return true;};
getEventDispatcher->addEventListenerWithSceneGraphPriority(touchSwallower ,scrollview);


for(int i=0; i < 5; i++){
    Sprite* foo = Sprite::createWithSpriteFrameName("foo");
    myScrollView->addChild(foo);

    auto listener = EventListenerTouchOneByOne::create();
    listener->setSwallowed(true);
    listener->onTouchBegan = [this,somestring](Touch* touch, Event* event){
        ......some code
       Vec2 touchPos = myScrollView->convertTouchToNodeSpace(touch);
       return foo->getBoundingBox()->containsPoint(touchPos);
    };
    listener->onTouchMoved = [foo,this,somestring](Touch* touch, Event* event){
        ......some code
    };
    listener->onTouchEnded = [foo,this,somestring](Touch* touch, Event* event){
        ......some code
    };
 foo->getEventDispatcher->addEventListenerWithSceneGraphPriority(listener1,foo);
}

Answer 2

cocos2dx会将触摸事件发送给附加触摸事件的每个节点，除非有人吞下它。

但是如果你想让“node”默认判断内容中是否触摸位置，请尝试将“UIWidget”与“addTouchEventListener”一起使用。它将自行计算。

bool Widget::onTouchBegan(Touch *touch, Event *unusedEvent)
{
    _hitted = false;
    if (isVisible() && isEnabled() && isAncestorsEnabled() && isAncestorsVisible(this) )
    {
        _touchBeganPosition = touch->getLocation();
        auto camera = Camera::getVisitingCamera();
        if(hitTest(_touchBeganPosition, camera, nullptr))
        {
            if (isClippingParentContainsPoint(_touchBeganPosition)) {
                _hittedByCamera = camera;
                _hitted = true;
            }
        }
    }
    if (!_hitted)
    {
        return false;
    }
    setHighlighted(true);

    /*
     * Propagate touch events to its parents
     */
    if (_propagateTouchEvents)
    {
        this->propagateTouchEvent(TouchEventType::BEGAN, this, touch);
    }

    pushDownEvent();
    return true;
}

为什么即使我在精灵外面触摸也会触发触摸事件？

2 个答案: