【cocod2d-x CCMenu菜单】

CCMenu是一个菜单项的容器，用来装载各种菜单项， 菜单项可以是图片、系统字、或者自定义字体。

菜单项常用设置：

 void alignItemsVertically(); //垂直方向默认间隙排列, 5个像素
 void alignItemsVerticallyWithPadding(float padding);//垂直方向以padding间隙排列
 void alignItemsHorizontally();//水平方向默认间隙排列
 void alignItemsHorizontallyWithPadding(float padding);//水平方向以padding间隙排列, 5个像素
 void alignItemsInColumns(unsigned int columns, ...);//将items按照列排列
 void alignItemsInColumns(unsigned int columns, va_list args);
 void alignItemsInRows(unsigned int rows, ...);//将items按照行排列
 void alignItemsInRows(unsigned int rows, va_list args);

菜单图1：

程序代码：

bool HelloWorld::init()
{
    //////////////////////////////
    // 1. super init first
    if ( !CCLayer::init() )
    {
        return false;
    }

    CCSize visibleSize = CCDirector::sharedDirector()->getVisibleSize();
    CCPoint origin = CCDirector::sharedDirector()->getVisibleOrigin();
	CCLOG("origin.x: %f, origin.y: %f", origin.x, origin.y)	;

    /////////////////////////////
    // 2. add a menu item with "X" image, which is clicked to quit the program
    //    you may modify it.

    // add a "close" icon to exit the progress. it's an autorelease object
    CCMenuItemImage *pCloseItem = CCMenuItemImage::create(
                                        "CloseNormal.png",
                                        "CloseSelected.png",
                                        this,
                                        menu_selector(HelloWorld::menuCloseCallback));

	pCloseItem->setPosition(ccp(origin.x + visibleSize.width - pCloseItem->getContentSize().width/2 ,
                                origin.y + pCloseItem->getContentSize().height/2));

    // create menu, it's an autorelease object
    CCMenu* pMenu = CCMenu::create(pCloseItem, NULL);
    pMenu->setPosition(CCPointZero);
    this->addChild(pMenu, 1);

    /////////////////////////////
    // add your codes below...
	//创建2菜单，每个菜单包括3个菜单项
	for (int i=0; i<2; i++)
	{
		//创建菜单项
		CCMenuItemImage *item1 = CCMenuItemImage::create("btn-about-normal.png", "btn-about-selected.png", this, menu_selector(HelloWorld::menuCallback));
		CCMenuItemImage *item2 = CCMenuItemImage::create("btn-highscores-normal.png", "btn-highscores-selected.png", this, menu_selector(HelloWorld::menuCallback2));
		CCMenuItemImage *item3 = CCMenuItemImage::create("btn-play-normal.png", "btn-play-selected.png", this, menu_selector(HelloWorld::menuCallback3));

		//缩放
		item1->setScaleX( 1.5f );
		item2->setScaleX( 0.5f );
		item3->setScaleX( 0.5f );

		//创建菜单，设置位置
		CCMenu* menu = CCMenu::create(item1, item2, item3, NULL);
		CCSize s = CCDirector::sharedDirector()->getWinSize();
		menu->setPosition(ccp(s.width/2, s.height/2));

		menu->setTag( kTagMenu );

		this->addChild(menu, 0, 100+i);//每个菜单包含标签

		m_centeredMenu = menu->getPosition(); //保存菜单坐标

	}
	m_alignedH = true; //水平对齐标记
	alignMenusH();//菜单水平对齐
    return true;
}
void HelloWorld::menuCallback(CCObject* pSender)
{
}

//第二个菜单项事件处理
void HelloWorld::menuCallback2(CCObject* pSender)
{
	   CCMenu *menu = (CCMenu*)(((CCNode*)(pSender))->getParent());//获取菜单指针
	   GLubyte opacity = menu->getOpacity();//获取菜单透明度
	   if (opacity==80)//若为100，设置不透明，否则设置透明度100
	   {
		   menu->setOpacity(255);
	   }
	   else
		   menu->setOpacity(80);

}
//第三个菜单项事件处理
void HelloWorld::menuCallback3(CCObject* pSender)
{
	m_alignedH = ! m_alignedH;

	if( m_alignedH )  //刚开始是水平对齐
		alignMenusH();
	else
		alignMenusV(); 

}
//水平对齐
void HelloWorld::alignMenusH()
{
	for(int i=0;i<2;i++)
	{
		CCMenu *menu = (CCMenu*)getChildByTag(100+i);//根据标记获取菜单
		menu->setPosition( m_centeredMenu );//初始时菜单的位置
		if(i==0) //第1个菜单位置
		{
			//水平方向5个像素对齐
			menu->alignItemsHorizontally();
			CCPoint p = menu->getPosition();
			menu->setPosition( ccpAdd(p, ccp(0,30)) );//p.x+30, p.y+30

		}
		else //第2个菜单位置
		{
			////水平方向40个像素对齐
			menu->alignItemsHorizontallyWithPadding(40);
			CCPoint p = menu->getPosition();
			menu->setPosition( ccpSub(p, ccp(0,30)) );//p.x-30, p.y-30
		}
	}
}

//垂直对齐
void HelloWorld::alignMenusV()
{
	for(int i=0;i<2;i++)
	{
		CCMenu *menu = (CCMenu*)getChildByTag(100+i);
		menu->setPosition( m_centeredMenu );
		if(i==0)
		{
			//垂直方向5个像素对齐
			menu->alignItemsVertically();
			CCPoint p = menu->getPosition();
			menu->setPosition( ccpAdd(p, ccp(100,0)) );
		}
		else
		{
			//垂直方向40个像素对齐
			menu->alignItemsVerticallyWithPadding(40);
			CCPoint p = menu->getPosition();
			menu->setPosition( ccpSub(p, ccp(100,0)) );
		}
	}
}

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