Cocos2d-3.x_触摸事件(单点触摸和多点触摸)

最新推荐文章于 2021-04-13 10:17:16 发布

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最新推荐文章于 2021-04-13 10:17:16 发布

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分类专栏： Cocos2d-x开发文章标签： Cocos2d-3.x 触摸事件单点触摸多点触摸

本文链接：https://blog.youkuaiyun.com/c201038795050/article/details/45010405

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本文介绍了一个使用Cocos2d-x游戏引擎创建的基本HelloWorld场景示例。示例中展示了如何创建一个带有文本标签的场景，并实现单点及多点触摸事件监听。

<pre class="cpp" name="code">#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__

#include "cocos2d.h"

USING_NS_CC;


class HelloWorld : public cocos2d::Layer
{
public:
    static cocos2d::Scene* createScene();

    virtual bool init();

    CREATE_FUNC(HelloWorld);

private:
	LabelTTF *pLabel;
};

#endif // __HELLOWORLD_SCENE_H__

#include "HelloWorldScene.h"

Scene* HelloWorld::createScene()
{
    auto scene = Scene::create();
    auto layer = HelloWorld::create();
    scene->addChild(layer);

    return scene;
}

bool HelloWorld::init()
{
    if ( !Layer::init() )
    {
        return false;
    }
    
    Size visibleSize = Director::getInstance()->getVisibleSize();
    Vec2 origin = Director::getInstance()->getVisibleOrigin();

	pLabel = LabelTTF::create("HelloWorld", "fonts/Arial.ttf", 30);
	pLabel->setPosition(visibleSize.width / 2.0, visibleSize.height / 2.0);
	this->addChild(pLabel);

	auto listener = EventListenerTouchOneByOne::create();
	listener->onTouchBegan = [](Touch *t, Event *e)
	{
		if (e->getCurrentTarget()->getBoundingBox().containsPoint(t->getLocation()))
		{
			log("onTouchBegan");
		}
		// return true;   返回真，可以让触摸回调传递到onTouchMoved和onTouchEnded
		// return false;   返回假，不可以让触摸回调传递到onTouchMoved和onTouchEnded
		return false;
	};

	listener->onTouchMoved = [](Touch *t, Event *e)
	{
		log("onTouchMoved");
	};

	listener->onTouchEnded = [](Touch *t, Event *e)
	{
		log("onTouchEnded");
	};

	Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(listener, pLabel);

    return true;
}

#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__

#include "cocos2d.h"

USING_NS_CC;


class HelloWorld : public cocos2d::Layer
{
public:
    static cocos2d::Scene* createScene();

    virtual bool init();

    CREATE_FUNC(HelloWorld);

private:
	LabelTTF *pLabel;
};

#endif // __HELLOWORLD_SCENE_H__

#include "HelloWorldScene.h"

Scene* HelloWorld::createScene()
{
    auto scene = Scene::create();
    auto layer = HelloWorld::create();
    scene->addChild(layer);

    return scene;
}

bool HelloWorld::init()
{
    if ( !Layer::init() )
    {
        return false;
    }
    
    Size visibleSize = Director::getInstance()->getVisibleSize();
    Vec2 origin = Director::getInstance()->getVisibleOrigin();

	pLabel = LabelTTF::create("HelloWorld", "fonts/Arial.ttf", 30);
	pLabel->setPosition(visibleSize.width / 2.0, visibleSize.height / 2.0);
	this->addChild(pLabel);

	// 开启多点触摸
	this->setTouchEnabled(true);

	auto listener = EventListenerTouchAllAtOnce::create();
	listener->onTouchesBegan = [](std::vector<Touch *> ts, Event *e)
	{
		log("onTouchesBegan");
	};

	listener->onTouchesMoved = [](std::vector<Touch *> ts, Event *e)
	{
		log("touch is moved, touch's count is %d", ts.size());
	};

	listener->onTouchesEnded = [](std::vector<Touch *> ts, Event *e)
	{
		log("onTouchesEnded");
	};

	Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(listener, this);

    return true;
}