cocos2dx radiogrouop单选按钮的实现

#ifndef __SceneHello__CCRadioMenu__   
#define __SceneHello__CCRadioMenu__   
#include "cocos2d.h"   
class CCRadioMenu : public cocos2d::Ccmenu{  
public:  
	CCRadioMenu():cocos2d::Ccmenu(){}  
	cocos2d::CcmenuItem *_curHighlighted;  
	virtual bool ccTouchBegan(cocos2d::CCTouch *pTouch,cocos2d::CCEvent *pEvent);  
	virtual void ccTouchEnded(cocos2d::CCTouch *pTouch,cocos2d::CCEvent *pEvent);  
	virtual void ccTouchCancelled(cocos2d::CCTouch *pTouch,cocos2d::CCEvent *pEvent); 
	virtual void ccTouchMoved(cocos2d::CCTouch *pTouch,cocos2d::CCEvent *pEvent);  
	void setSelectedItem_(cocos2d::CcmenuItem *item);  
	static CCRadioMenu* create(cocos2d::CcmenuItem* item,...);  
};  
#endif /* defined(__SceneHello__CCRadioMenu__) */  

#include "CCRadioMenu.h"   
using namespace cocos2d;  
CCRadioMenu *CCRadioMenu::create(CcmenuItem *item,...){  
	va_list args; 
	va_start(args,item);  
	CCRadioMenu *pRet = new CCRadioMenu();  
	CCArray* pArray = NULL;  
	if( item )  
	{  
		pArray = CCArray::create(item,NULL);  
		CcmenuItem *i = va_arg(args,CcmenuItem*);  
		while(i)  
		{  
			pArray->addobject(i);  
			i = va_arg(args,CcmenuItem*);  
		}  
	}  
	if (pRet && pRet->initWithArray(pArray))  
	{  
		pRet->autorelease(); 
		va_end(args);  
		return pRet;  
	}  
	va_end(args); 
	CC_SAFE_DELETE(pRet); 
	return NULL;  
	}  

void CCRadioMenu::setSelectedItem_(CcmenuItem *item){  
	m_pSelectedItem = NULL;  
	m_pSelectedItem = item;  
	}  

bool CCRadioMenu::ccTouchBegan(CCTouch *pTouch,CCEvent *pEvent){  
	if (m_eState != kCcmenuStateWaiting) return false;  
	CcmenuItem *curSelection = this->itemForTouch(pTouch);  
	if (curSelection) {  
		curSelection->selected();  
		 _curHighlighted = curSelection;  
		if (_curHighlighted) {  
			if (m_pSelectedItem != curSelection) {  
				m_pSelectedItem->unselected();  
			}  
			m_eState = kCcmenuStateTrackingTouch;  
			return true;  
		}  
	}  
	return false;  
}  

void CCRadioMenu::ccTouchEnded(CCTouch *pTouch,CCEvent *pEvent){
	CCAssert(m_eState == kCcmenuStateTrackingTouch,"[Menu ccTouchEnded] -- invalid state");  
	CcmenuItem *curSelection = this->itemForTouch(pTouch);  
	if (curSelection != _curHighlighted && curSelection != NULL) {  
		m_pSelectedItem->selected();  
		_curHighlighted->unselected();  
		_curHighlighted = NULL;  
		m_eState = kCcmenuStateWaiting;  
		return;  
		}  
	
	m_pSelectedItem = _curHighlighted;  
	_curHighlighted->activate();  
	_curHighlighted = NULL;  
	m_eState = kCcmenuStateWaiting;  
	}  

void CCRadioMenu::ccTouchCancelled(CCTouch *pTouch,CCEvent *pEvent){  
	CCAssert(m_eState == kCcmenuStateTrackingTouch,"[Menu ccTouchCancelled] -- invalid state");  
	m_pSelectedItem->selected();  
	_curHighlighted->unselected();  
	 _curHighlighted = NULL;  
	 m_eState = kCcmenuStateWaiting;  
	}  

void CCRadioMenu::ccTouchMoved(CCTouch *pTouch,"[Menu ccTouchMoved] -- invalid state");  
	CcmenuItem *curSelection = this->itemForTouch(pTouch);  
	if (curSelection != _curHighlighted && curSelection != NULL) {  
		_curHighlighted->unselected();  
		curSelection->selected();  
		_curHighlighted = curSelection;  
		return;  
	}  
}  

CcmenuItemImage *menuItem_man = CcmenuItemImage::create(
		"jsman_nor.png","jsman_pre.png",this,menu_selector(HelloWorld::selectMan));
	menuItem_man->setPosition(ccp(size.width*0.3f,size.height*0.66f));

	CcmenuItemImage *menuItem_man2 = CcmenuItemImage::create(
		"jsman_nor.png",menu_selector(HelloWorld::selectMan));
	menuItem_man2->setPosition(ccp(size.width*0.3f,size.height*0.3f));
	
	CcmenuItemImage *menuItem_woman = CcmenuItemImage::create(
		"jswoman_nor.png","jswoman_pre.png",menu_selector(HelloWorld::selectWomen));
	menuItem_woman->setPosition(ccp(size.width*0.7f,size.height*0.66f));

	CcmenuItemImage *menuItem_woman2 = CcmenuItemImage::create(
		"jswoman_nor.png",menu_selector(HelloWorld::selectWomen));
	menuItem_woman2->setPosition(ccp(size.width*0.7f,size.height*0.3f));

	CCRadioMenu *radioMenu = CCRadioMenu::create(menuItem_man,menuItem_man2,menuItem_woman,menuItem_woman2,NULL);  
	radioMenu->setSelectedItem_(menuItem_man);  
	menuItem_man->selected();  
	radioMenu->setPosition(CCPointZero);
	this->addChild(radioMenu,1);