Cocos2d-x学习笔记（18）（TestCpp源代码分析-2）

本章主要讲controller.h/cpp文件的分析，该文件主要用于演示样例场景管理类TestController，用于显示全部演示样例的菜单。

//controller.cpp
#include "controller.h"
#include "testResource.h"
#include "tests.h"

#define LINE_SPACE          40

static CCPoint s_tCurPos = CCPointZero;//设置当前位置为屏幕左下角

static TestScene* CreateTestScene(int nIdx)  //静态函数，创建TestScene，nldx与test.h中的枚举变量做比較。确定新建的场景。
{
    CCDirector::sharedDirector()->purgeCachedData();

    TestScene* pScene = NULL;

    switch (nIdx)  //依据传入的nldx，通过switch函数创建对应的场景
    {
    case TEST_ACTIONS:
        pScene = new ActionsTestScene(); break;
    case TEST_TRANSITIONS:
        pScene = new TransitionsTestScene(); break;
     case TEST_PROGRESS_ACTIONS:
         pScene = new ProgressActionsTestScene(); break;
    case TEST_EFFECTS:
        pScene = new EffectTestScene(); break;
    case TEST_CLICK_AND_MOVE:
        pScene = new ClickAndMoveTestScene(); break;
    case TEST_ROTATE_WORLD:
        pScene = new RotateWorldTestScene(); break;
    case TEST_PARTICLE:
        pScene = new ParticleTestScene(); break;
    case TEST_EASE_ACTIONS:
        pScene = new ActionsEaseTestScene(); break;
    case TEST_MOTION_STREAK:
        pScene = new MotionStreakTestScene(); break;
    case TEST_DRAW_PRIMITIVES:
        pScene = new DrawPrimitivesTestScene(); break;
    case TEST_COCOSNODE:
        pScene = new CocosNodeTestScene(); break;
    case TEST_TOUCHES:
        pScene = new PongScene(); break;
    case TEST_MENU:
        pScene = new MenuTestScene(); break;
    case TEST_ACTION_MANAGER:
        pScene = new ActionManagerTestScene(); break;
    case TEST_LAYER:
        pScene = new LayerTestScene(); break;
    case TEST_SCENE:
        pScene = new SceneTestScene(); break;
    case TEST_PARALLAX:
        pScene = new ParallaxTestScene(); break;
    case TEST_TILE_MAP:
        pScene = new TileMapTestScene(); break;
    case TEST_INTERVAL:
        pScene = new IntervalTestScene(); break;
    case TEST_LABEL:
        pScene = new AtlasTestScene(); break;
    case TEST_TEXT_INPUT:
        pScene = new TextInputTestScene(); break;
    case TEST_SPRITE:
        pScene = new SpriteTestScene(); break;
    case TEST_SCHEDULER:
        pScene = new SchedulerTestScene(); break;
    case TEST_RENDERTEXTURE:
        pScene = new RenderTextureScene(); break;
    case TEST_TEXTURE2D:  
        pScene = new TextureTestScene(); break;
#if (CC_TARGET_PLATFORM != CC_PLATFORM_MARMALADE) //注意
    case TEST_CHIPMUNK:
        pScene = new ChipmunkAccelTouchTestScene(); break;
#endif
    case TEST_BOX2D:
        pScene = new Box2DTestScene(); break;
    case TEST_BOX2DBED:
        pScene = new Box2dTestBedScene(); break;
    case TEST_EFFECT_ADVANCE:
        pScene = new EffectAdvanceScene(); break;
    case TEST_ACCELEROMRTER:
        pScene = new AccelerometerTestScene(); break;
#if (CC_TARGET_PLATFORM != CC_PLATFORM_BADA) //注意
    case TEST_KEYPAD:
        pScene = new KeypadTestScene(); break;
#endif
    case TEST_COCOSDENSHION:
        pScene = new CocosDenshionTestScene(); break;
    case TEST_PERFORMANCE:
        pScene = new PerformanceTestScene(); break;
    case TEST_ZWOPTEX:
        pScene = new ZwoptexTestScene(); break;
// bada don't support libcurl
#if (CC_TARGET_PLATFORM != CC_PLATFORM_BADA && CC_TARGET_PLATFORM != CC_PLATFORM_NACL && CC_TARGET_PLATFORM != CC_PLATFORM_MARMALADE)
    case TEST_CURL:
        pScene = new CurlTestScene(); break;
#endif
    case TEST_USERDEFAULT:
        pScene = new UserDefaultTestScene(); break;
    case TEST_BUGS:
        pScene = new BugsTestScene(); break;
    case TEST_FONTS:
        pScene = new FontTestScene(); break;
    case TEST_CURRENT_LANGUAGE:
        pScene = new CurrentLanguageTestScene(); break;
#if (CC_TARGET_PLATFORM != CC_PLATFORM_MARMALADE)
    case TEST_TEXTURECACHE: pScene = new TextureCacheTestScene(); break;
#endif
    case TEST_EXTENSIONS:
        pScene = new ExtensionsTestScene();
        break;
    case TEST_SHADER:
        pScene = new ShaderTestScene();
        break;
    case TEST_MUTITOUCH:
        pScene = new MutiTouchTestScene();
        break;
#if (CC_TARGET_PLATFORM != CC_PLATFORM_MARMALADE)
    case TEST_CLIPPINGNODE:
        pScene = new ClippingNodeTestScene();
        break;
#endif
    case TEST_FILEUTILS:
        pScene = new FileUtilsTestScene();
        break;
    case TEST_SPINE:
        pScene = new SpineTestScene();
        break;
    default:
        break;
    }

    return pScene;
}

TestController::TestController()
: m_tBeginPos(CCPointZero)  //构造函数

{
    // add close menu  创建菜单图片，s_pPathClose为testResource.h中的宏定义。menu_selector为TestController的closeCallback函数，相似Qt的信号与槽
    CCMenuItemImage *pCloseItem = CCMenuItemImage::create(s_pPathClose, s_pPathClose, this, menu_selector(TestController::closeCallback) );
    CCMenu* pMenu =CCMenu::create(pCloseItem, NULL);  //创建菜单，用上面创建的CCMenuItemImage

    pMenu->setPosition( CCPointZero );//设置菜单位置
    pCloseItem->setPosition(ccp( VisibleRect::right().x - 30, VisibleRect::top().y - 30)); //设置pCloseItem的位置
	//距离右边30，上边30
    // add menu items for tests
    m_pItemMenu = CCMenu::create();  //m_pItemMenu为 CCMenu*指针变量，用于存储46个演示样例的标题
    for (int i = 0; i < TESTS_COUNT; ++i)  //TESTS_COUNT为test.h中的枚举变量成员，最后一个成员。
    {
// #if (CC_TARGET_PLATFORM == CC_PLATFORM_MARMALADE)
//         CCLabelBMFont* label = CCLabelBMFont::create(g_aTestNames[i].c_str(),  "fonts/arial16.fnt");
// #else
        CCLabelTTF* label = CCLabelTTF::create(g_aTestNames[i].c_str(), "Arial", 24);  //g_aTestNames是一个string数组
// #endif        
        CCMenuItemLabel* pMenuItem = CCMenuItemLabel::create(label, this, menu_selector(TestController::menuCallback));

        m_pItemMenu->addChild(pMenuItem, i + 10000);  //zOrder指定元素先后顺序，为i+10000
        pMenuItem->setPosition( ccp( VisibleRect::center().x, (VisibleRect::top().y - (i + 1) * LINE_SPACE) ));  //LINE_SPACE是该cpp文件的宏定义，为40
    }

    m_pItemMenu->setContentSize(CCSizeMake(VisibleRect::getVisibleRect().size.width, (TESTS_COUNT + 1) * (LINE_SPACE)));
    m_pItemMenu->setPosition(s_tCurPos);  //设置该m_pItemMenu位置
    addChild(m_pItemMenu);  //加入到层

    setTouchEnabled(true);  //设置触摸功能
	 
    addChild(pMenu, 1);  //加入关闭菜单到层

}

TestController::~TestController()  //析构函数
{
}

void TestController::menuCallback(CCObject * pSender)  //參数为与label连接的节点
{
    // get the userdata, it's the index of the menu item clicked
    CCMenuItem* pMenuItem = (CCMenuItem *)(pSender);  
    int nIdx = pMenuItem->getZOrder() - 10000;  //获得节点的zOrder值，由于创建时是i+10000，此处减去10000；

    // create the test scene and run it  依据nldx值传递到CreateTestScene函数中，创建对应的场景
    TestScene* pScene = CreateTestScene(nIdx);  //CreateTestScene为static函数，为整个类共同拥有
    if (pScene)
    {
        pScene->runThisTest();  //创建成功执行该场景
        pScene->release();  //通过回收池释放场景内存
    }
}

void TestController::closeCallback(CCObject * pSender)  //pCloseItem调用的关闭函数
{
    CCDirector::sharedDirector()->end();
#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
    exit(0);
#endif
}

void TestController::ccTouchesBegan(CCSet *pTouches, CCEvent *pEvent)
{
    CCSetIterator it = pTouches->begin();
    CCTouch* touch = (CCTouch*)(*it);

    m_tBeginPos = touch->getLocation();    
}

void TestController::ccTouchesMoved(CCSet *pTouches, CCEvent *pEvent)
{
    CCSetIterator it = pTouches->begin();
    CCTouch* touch = (CCTouch*)(*it);

    CCPoint touchLocation = touch->getLocation();    
    float nMoveY = touchLocation.y - m_tBeginPos.y;

    CCPoint curPos  = m_pItemMenu->getPosition();
    CCPoint nextPos = ccp(curPos.x, curPos.y + nMoveY);

    if (nextPos.y < 0.0f)
    {
        m_pItemMenu->setPosition(CCPointZero);
        return;
    }

    if (nextPos.y > ((TESTS_COUNT + 1)* LINE_SPACE - VisibleRect::getVisibleRect().size.height))
    {
        m_pItemMenu->setPosition(ccp(0, ((TESTS_COUNT + 1)* LINE_SPACE - VisibleRect::getVisibleRect().size.height)));
        return;
    }

    m_pItemMenu->setPosition(nextPos);
    m_tBeginPos = touchLocation;
    s_tCurPos   = nextPos;
}

//controller.h

#ifndef _CONTROLLER_H_
#define _CONTROLLER_H_

#include "cocos2d.h"

USING_NS_CC;

class TestController : public CCLayer  //创建全部演示样例的菜单。继承自CCLayer层
{
public:
    TestController();
    ~TestController();

    void menuCallback(CCObject * pSender);  //返回主菜单函数
    void closeCallback(CCObject * pSender);  //关闭应用程序函数

    virtual void ccTouchesBegan(CCSet *pTouches, CCEvent *pEvent);  //重写该函数
    virtual void ccTouchesMoved(CCSet *pTouches, CCEvent *pEvent);  //重写该函数

private:
    CCPoint m_tBeginPos;  //起始位置
    CCMenu* m_pItemMenu;  //菜单
};

#endif