Cocos2d-x 开发 点击交互的四种处理

1、函数回调

1. void menuCloseCallback(Object* pSender);
3. auto closeItem = MenuItemImage::create("CloseNormal.png","CloseSelected.png",
4. CC_CALLBACK_1(HelloWorld::menuCloseCallback, this));
6. void HelloWorld::menuCloseCallback(Object* pSender)
7. {
8. Director::getInstance()->end();
10. #if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
11. exit(0);
12. #endif
13. }

2、Layer的touch消息响应

1. //单点响应
2. virtual bool onTouchBegan(Touch* touch, Event *event) override;
3. virtual void onTouchMoved(Touch* touch, Event *event) override;
4. virtual void onTouchEnded(Touch* touch, Event *event) override;
5. virtual void onTouchCancelled(Touch *touch, Event *event) override;
7. //多点响应
8. virtual bool onTouchesBegan(Touch* touch, Event *event) override;
9. virtual void onTouchesMoved(Touch* touch, Event *event) override;
10. virtual void onTouchesEnded(Touch* touch, Event *event) override;
11. virtual void onTouchesCancelled(Touch *touch, Event *event) override;

重写这些函数来对layer的点击做处理。当然，我们需要：

[cpp] view plaincopyprint?

1. setTouchEnabled(true)。

此外有个小改动。对于单点触控响应，可以调用：

[cpp] view plaincopyprint?

1. //设置为单点响应
2. setTouchMode(Touch::DispatchMode::ONE_BY_ONE);
3. //设置为多点响应（默认）
4. setTouchMode(Touch::DispatchMode::ALL_AT_ONCE);

3、TouchEvent响应 这是新加入的响应方式。它主要是使用在UIWidget上的。可以将其看做是函数回调的一个扩展，为更多的响应处理提供可能。使用方法大致是：
[cpp] view plaincopyprint?

1. //声明
2. void touchButton(Object* object,TouchEventType type);
4. //挂接到控件上
5. uiButton->addTouchEventListener(this,toucheventselector(HelloWorld::touchButton));
7. //实现
8. void HelloWorld::touchButton(Object* object,TouchEventType type)
9. {
10. LabelTTF* label;
11. switch (type)
12. {
13. case TouchEventType::TOUCH_EVENT_BEGAN:
14. label = static_cast<LabelTTF*>(getChildByTag(11));
15. label->setString("按下按钮");
16. break;
17. case TouchEventType::TOUCH_EVENT_MOVED:
18. label = static_cast<LabelTTF*>(getChildByTag(11));
19. label->setString("按下按钮移动");
20. break;
21. case TouchEventType::TOUCH_EVENT_ENDED:
22. label = static_cast<LabelTTF*>(getChildByTag(11));
23. label->setString("放开按钮");
24. break;
25. case TouchEventType::TOUCH_EVENT_CANCELED:
26. label = static_cast<LabelTTF*>(getChildByTag(11));
27. label->setString("取消点击");
28. break;
29. default:
30. break;
31. }
32. }

4、Listener消息响应方式[cpp] view plaincopyprint?

1. auto dispatcher = EventDispatcher::getInstance();
2. auto myListener = EventListenerTouch::create(Touch::DispatchMode::ONE_BY_ONE);
4. //如果不加入此句消息依旧会向下传递
5. myListener->setSwallowTouches(true);
7. myListener->onTouchBegan = [=](Touch* touch,Event* event)
8. {
9. <span style="white-space:pre"> </span>//some check
10. <span style="white-space:pre"> </span> if (pass)
11. <span style="white-space:pre"> </span>{
12. return true;
13. }
14. return false;
15. };
17. myListener->onTouchMoved = [=](Touch* touch,Event* event)
18. {
19. //do something
20. };
22. myListener->onTouchEnded = [=](Touch* touch,Event* event)
23. {
24. //do something
25. };
27. dispatcher->addEventListenerWithSceneGraphPriority(myListener,mySprite1);
28. dispatcher->addEventListenerWithSceneGraphPriority(myListener,mySprite2);