cocos2d-x之Ref列表容器(实例：__Array容器)

cocos2d-x之Ref列表容器(实例：__Array容器)

HelloWorldScene.h

#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__

#include "cocos2d.h"

#define MAX_COUNT 100
//定义宏，定义了一次生成的精灵数


class HelloWorld : public cocos2d::Layer
{
    //声明—__Array * 的成员变量list
    cocos2d::__Array *list;

public:

    //声明析构函数，需要在析构函数中释放成员变量
    ~HelloWorld();

    // there's no 'id' in cpp, so we recommend returning the class instance pointer
    static cocos2d::Scene* createScene();

    // Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone
    virtual bool init();  
    
    // a selector callback
    void menuCloseCallback(cocos2d::Ref* pSender);
    
    // implement the "static create()" method manually
    CREATE_FUNC(HelloWorld);
};

#endif // __HELLOWORLD_SCENE_H__

HelloWorldScene.cpp

#include "HelloWorldScene.h"

USING_NS_CC;


HelloWorld::~HelloWorld(){

    //移除容器中的所有对象，但还没有释放list容器对象本身
    this->list->removeAllObjects();
    //安全释放成员变量list容器对象，
    //CC_SAFE_RELEASE_NULL是将list容器对象释放后再赋予nullptr
    CC_SAFE_RELEASE_NULL(this->list);

}

Scene* HelloWorld::createScene()
{
    // 'scene' is an autorelease object
    auto scene = Scene::create();
    
    // 'layer' is an autorelease object
    auto layer = HelloWorld::create();

    // add layer as a child to scene
    scene->addChild(layer);

    // return the scene
    return scene;
}

// on "init" you need to initialize your instance
bool HelloWorld::init()
{
    //////////////////////////////
    // 1. super init first
    if ( !Layer::init() )
    {
        return false;
    }
    
    Size visibleSize = Director::getInstance()->getVisibleSize();
    Vec2 origin = Director::getInstance()->getVisibleOrigin();

    auto goItem = MenuItemImage::create("go-down.png", "go-up.png", CC_CALLBACK_1(HelloWorld::menuCloseCallback, this));
    goItem->setPosition(Vec2(origin.x + visibleSize.width - goItem->getContentSize().width / 2, origin.y + goItem->getContentSize().height / 2));

    auto menu = Menu::create(goItem, NULL);
    menu->setPosition(Vec2::ZERO);
    this->addChild(menu);

    //创建__Array类型的list成员变量，使用createWithCapacity函数，参数是list容器的初始化容量
    this->list = __Array::createWithCapacity(MAX_COUNT);
    //采用静态函数createWithCapacity创建的list容器对象是autorelease的，
    //如果不调用retain()函数保持内存，
    //当init函数结束时，
    //list容器对象会自动释放，
    //这样在其他函数中在使用list就会出错
    this->list->retain();

    for (int i = 0; i < MAX_COUNT; i++){
        //循环创建精灵对象
        Sprite *sprite = Sprite::create("Ball.png");
        //将精灵添加到list容器对象中，但是这些精灵还没有被添加到场景中，因此，场景显示的时候他们是不出现的
        this->list->addObject(sprite);
    }
    
    return true;
}


void HelloWorld::menuCloseCallback(Ref* pSender)
{
//#if (CC_TARGET_PLATFORM == CC_PLATFORM_WP8) || (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT)
//    MessageBox("You pressed the close button. Windows Store Apps do not implement a close button.","Alert");
//    return;
//#endif
//
//    Director::getInstance()->end();
//
//#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
//    exit(0);
//#endif

    /**************************
    测试 包装类"Value"
    ***************************
    Value v1;
    CCASSERT(v1.isNull(), "");//判断v1是否为空

    Value v2(100);//创建int类型的Value对象
    //输出对象的描述信息，类似于java中的 toString（）
    log("<><> The description of the integer value:%s  <><>", v2.getDescription().c_str());
    log("<><>  v2.asByte() = %c <><>", v2.asByte());//将v2转换为byte类型

    Value v3(101.4f);
    log("<><> The description of the float value:%s  <><>", v3.getDescription().c_str());

    Value v4(106.1);
    log("<><> The description of the double value:%s  <><>", v4.getDescription().c_str());
    log("<><>  v4.asInt() = %d <><>", v4.asInt());

    unsigned char byte = 50;
    Value v5(byte);
    log("<><> The description of the byte value:%s  <><>", v5.getDescription().c_str());

    Value v6(true);
    log("<><> The description of the boolean value:%s  <><>", v6.getDescription().c_str());

    Value v7("123");
    log("<><> The description of the string value:%s  <><>", v7.getDescription().c_str());
    log("<><>  v7.asInt() = %d <><><>", v7.asInt());

    **************************
    测试 包装类"Value"
    ***************************/


    log("><>><><>  list->count() = %d  <>>><>>", this->list->count());
    Size visibleSize = Director::getInstance()->getVisibleSize();

    Ref *obj = nullptr;

    //使用宏，循环遍历list容器中的数据
    CCARRAY_FOREACH(this->list, obj){
    
        //获得精灵对象
        Sprite *sprite = (Sprite *)obj;

        //随机产生x轴坐标，CCRANDOM_0_1宏是随机产生0~1之间的随机数的宏
        int x = CCRANDOM_0_1() *visibleSize.width;
        int y = CCRANDOM_0_1() *visibleSize.height;

        sprite->setPosition(Vec2(x, y));
        this->removeChild(sprite);
        this->addChild(sprite);
    
    }

}