Cocos2d-x处理Touch触摸事件Demo
【摘要】 请参考《Ubuntu18.04搭建Cocos2d开发环境》搭建项目
默认情况下，Cocos2d-x会将鼠标左点击当作触摸。
第一步:在/home/kyun/Desktop/Games/MyGame/CMakeLists.txt文件添加TouchScene.h和TouchScene.cpp：
# add cross-platforms source files an...
请参考《Ubuntu18.04搭建Cocos2d开发环境》搭建项目
默认情况下，Cocos2d-x会将鼠标左点击当作触摸。
第一步:在/home/kyun/Desktop/Games/MyGame/CMakeLists.txt文件添加TouchScene.h和TouchScene.cpp：
# add cross-platforms source files and header files
list(APPEND GAME_SOURCE Classes/AppDelegate.cpp Classes/TouchScene.cpp )
list(APPEND GAME_HEADER Classes/AppDelegate.h Classes/TouchScene.h )
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第二步:编写TouchScene.h和TouchScene.cpp
TouchScene.h:
#include "cocos2d.h"
class TouchScene : public cocos2d::Layer {
public: static cocos2d::Scene* createScene(); virtual bool init();
//Touch事件回调方法 virtual bool onTouchBegan(cocos2d::Touch*,cocos2d::Event*); virtual void onTouchEnded(cocos2d::Touch*,cocos2d::Event*); virtual void onTouchMoved(cocos2d::Touch*,cocos2d::Event*); virtual void onTouchCancelled(cocos2d::Touch*,cocos2d::Event*); CREATE_FUNC(TouchScene);
private: cocos2d::Label* labelTouchInfo;
};
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TouchScene.cpp:
//
// Created by kyun on 20-3-12.
//
#include "TouchScene.h"
USING_NS_CC;
Scene* TouchScene::createScene() { auto scene = Scene::create(); auto layer = TouchScene::create(); scene->addChild(layer); return scene;
}
bool TouchScene::init() { if(!Layer::init()){ return false; }
// Label标签 labelTouchInfo = Label::createWithSystemFont("Touch or clicksomewhere to begin","Arial",30); labelTouchInfo->setPosition(Vec2(Director::getInstance()->getVisibleSize().width/2,Director::getInstance()->getVisibleSize().height/2)); // 创建EventListenerTouchOneByOne类型的事件监听器 auto touchListener = EventListenerTouchOneByOne::create(); // 将处理函数绑定到事件监听器上 touchListener->onTouchBegan = CC_CALLBACK_2(TouchScene::onTouchBegan,this); touchListener->onTouchEnded = CC_CALLBACK_2(TouchScene::onTouchEnded,this); touchListener->onTouchMoved = CC_CALLBACK_2(TouchScene::onTouchMoved,this); touchListener->onTouchCancelled = CC_CALLBACK_2(TouchScene::onTouchCancelled,this); // 将事件监听器注册到节点的_eventDispatcher上 _eventDispatcher->addEventListenerWithSceneGraphPriority(touchListener,this); this->addChild(labelTouchInfo); return true;
}
bool TouchScene::onTouchBegan(cocos2d::Touch * touch, cocos2d::Event * event) { labelTouchInfo->setPosition(touch->getLocation()); labelTouchInfo->setString("You touched here"); return true;
}
void TouchScene::onTouchEnded(cocos2d::Touch * touch, cocos2d::Event * event) { cocos2d::log("touch ended");
}
void TouchScene::onTouchMoved(cocos2d::Touch *touch, cocos2d::Event * event) { cocos2d::log("touch moved");
}
void TouchScene::onTouchCancelled(cocos2d::Touch *touch, cocos2d::Event *event) { cocos2d::log("touch cancelled");
}
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第三步:修改AppDelegate.cpp
#include "TouchScene.h"
...
bool AppDelegate::applicationDidFinishLaunching() { ... // create a scene. it's an autorelease object
auto scene = TouchScene::createScene(); // run director->runWithScene(scene); return true;
}
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最后，运行就可以了。
分析TouchScene中的用到的方法
- 关于EventListenerTouchOneByOne事件监听器处理函数的定义
class CC_DLL EventListenerTouchOneByOne : public EventListener
{ public: typedef std::function<bool(Touch*, Event*)> ccTouchBeganCallback; typedef std::function<void(Touch*, Event*)> ccTouchCallback; ccTouchBeganCallback onTouchBegan; ccTouchCallback onTouchMoved; ccTouchCallback onTouchEnded; ccTouchCallback onTouchCancelled;
... };
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我们根据此来定义我们的函数，上面规定了处理函数的返回值和形参顺序。其实我们也可以使用Lambda表达式来定义处理函数，如：
touchListener->onTouchBegan = [](Touch* touch,Event* event)->bool{
// todo
}
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完整的例子，我们修改init方法，让其使用lambda表达式来定义处理函数：
//
// Created by kyun on 20-3-12.
//
#include "TouchScene.h"
USING_NS_CC;
Scene* TouchScene::createScene() { auto scene = Scene::create(); auto layer = TouchScene::create(); scene->addChild(layer); return scene;
}
bool TouchScene::init() { if(!Layer::init()){ return false; } auto sprite = Sprite::create("logo2.png"); sprite->setAnchorPoint(Vec2(0.5,0.5)); auto visibleSize = Director::getInstance()->getVisibleSize(); Vec2 origin = Director::getInstance()->getVisibleOrigin(); sprite->setPosition(Vec2(visibleSize.width/2+origin.x,visibleSize.height/2+origin.y)); auto touchListener = EventListenerTouchOneByOne::create(); touchListener->onTouchBegan = [](Touch* touch,Event* event)->bool{ auto bounds = event->getCurrentTarget()->getBoundingBox(); if(bounds.containsPoint(touch->getLocation())){ std::stringstream touchDetails; touchDetails << "Touched at OpenGL coordinates:" <<touch->getLocation().x << "," << touch->getLocation().y << std::endl<< "Touched at UI coordinate:"<<touch->getLocationInView().x << "," << touch->getLocationInView().y << std::endl << "Touched at local coordinate:" << event->getCurrentTarget()->convertToNodeSpace(touch->getLocation()).x << "," << event->getCurrentTarget()->convertToNodeSpace(touch->getLocation()).y << std::endl<< "Touch moved by:" << touch->getDelta().x << "," << touch->getDelta().y; ccMessageBox(touchDetails.str().c_str(),"Touched"); } return true; }; // Add a "touch" event listener to our sprite Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(touchListener,sprite); this->addChild(sprite,0); this->addChild(labelTouchInfo); return true;
}
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上面的效果就是点sprite后会弹出一个对话框。
- ccMessageBox()弹窗
- touch->getLocationInView()返回在屏幕坐标系（原点在屏幕左上角）中的位置
- touch->getLocation()返回在OpenGL坐标系（原点在屏幕左下角）中的位置
谢谢阅读
文章来源: blog.csdn.net，作者：WongKyunban，版权归原作者所有，如需转载，请联系作者。
原文链接：blog.csdn.net/weixin_40763897/article/details/104822927
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