cocos2dx3.2 谈谈精灵也能加入触摸事件回调函数简单使用，呢吗有
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在我点游戏界面中放置两个按钮：Start,Exit,代表开始游戏，和结束游戏，如下：
看到了吧，妹妹不错吧，嘿，百度搜的。。 那么怎么做到的呢？ 首先导入资源ExitButton.jpg 和StartButton.jpg， 然后创建精灵如： auto start = Sprite::create("StartButton.jpg"); start->setPosition(Vec2(start->getContentSize().width / 2 + 20,visibleSize.height / 2)); addChild(start); 接下来给创建事件监听器，并绑定回调函数： auto startListener = EventListenerTouchOneByOne::create(); startListener->onTouchBegan =[&](cocos2d::Touch* touch,cocos2d::Event* event) { cocos2d::Vec2 p = touch->getLocation();
auto target = event->getCurrentTarget(); cocos2d::Rect rect = target->getBoundingBox(); // 判断触摸点是否在该按钮里面
if(rect.containsPoint(p)) { return true; // to indicate that we have consumed it. }
return false; // we did not consume this event,pass thru. }; startListener->onTouchEnded = [=](cocos2d::Touch* touch,cocos2d::Event* event) {
StartLayer::StartGame(nullptr); //开始游戏
};
最后将监听器加入事件分发器中，
Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(startListener,start); 这样就ok了，另一个退出按钮的实现也按照同样的方法。
这个是一般的方法，但是缺点比较明显，就是添加了许多东西，接下来我要介绍另一种方法，我将其封装到自定义到精灵中如下： CustomSprite.h头文件
// // CustomSprite.h // DontSaveMe // Created by Mr Gan on 12/23/14. // #ifndef __DontSaveMe__CustomSprite__ #define __DontSaveMe__CustomSprite__ #include "cocos2d.h" #include <string> #include <stdio.h> #include <functional> USING_NS_CC; class CustomSprite : public Sprite { public: virtual ~CustomSprite(){} static CustomSprite* createWithPath(const std::string &path);
std::function<bool(Touch*,Event*)> onTouchBegan; std::function<void(Touch*,Event*)> onTouchMoved; std::function<void(Touch*,Event*)> onTouchEnded; std::function<void(Touch*,Event*)> onTouchCancelled; protected: CustomSprite():onTouchBegan(nullptr),onTouchEnded(nullptr) {} virtual bool initWithFile(const std::string& filename) override; }; #endif /* defined(__DontSaveMe__CustomSprite__) */ // CustomSprite.cpp // #include "CustomSprite.h" CustomSprite *CustomSprite::createWithPath(const std::string &path) { auto sprite = new CustomSprite(); if(sprite && sprite->initWithFile(path)) { sprite->autorelease(); return sprite; } else { delete sprite; sprite = nullptr; return nullptr; }
} bool CustomSprite::initWithFile(const std::string& filename) { if(!Sprite::initWithFile(filename)) { return false; }
auto listener = cocos2d::EventListenerTouchOneByOne::create(); listener->setSwallowTouches(true);
listener->onTouchBegan = [&](cocos2d::Touch* touch,cocos2d::Event* event) { cocos2d::Vec2 p = touch->getLocation();
cocos2d::Rect rect = this->getBoundingBox(); if(rect.containsPoint(p)) { if(onTouchBegan) onTouchBegan(touch,event); return true; // to indicate that we have consumed it. }
};
listener->onTouchEnded = [=](cocos2d::Touch* touch,cocos2d::Event* event) { if(onTouchEnded) onTouchEnded(touch,event); };
cocos2d::Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(listener,this);
return true;
}
怎么用呢很简单如下：
auto start = CustomSprite::createWithPath("StartButton.jpg"); start->setPosition(Vec2(start->getContentSize().width / 2 + 20,visibleSize.height / 2));
start->onTouchEnded = CC_CALLBACK_2(StartLayer::onBeginTouchStartButton,this); addChild(start); auto exit = CustomSprite::createWithPath("ExitButton.jpg"); exit->setPosition(Vec2(start->getPositionX(),start->getPositionY() - 70)); exit->onTouchEnded = CC_CALLBACK_2(StartLayer::onBeginTouchExitButton,this); addChild(exit);
在定义onBeginTouchStartButton，和onBeginTouchExitButton
void StartLayer::onBeginTouchStartButton(Touch* touch,Event* event) { StartGame(nullptr); } void StartLayer::onBeginTouchExitButton(Touch* touch,Event* event) { ExitGame); }
这样就ok啦，可别忘了在头文件添加其引用，到此结束，希望能帮到一些小忙。
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