Cocos2d-x中实现弹出对话框示例

/*对话框场景类的头文件*/
#ifndef _POP_SCENE_H_
#define _POP_SCENE_H_
#include "cocos2d.h"

using namespace cocos2d;

class PopScene : public CCLayer
{
public:
	static CCScene * scene();
	bool init();
	CREATE_FUNC(PopScene);
private:
	//注册触摸事件，实现ccTouchBegan()方法
	void registerWithTouchDispatcher();
	bool ccTouchBegan(CCTouch * touch,CCEvent * pevent);
	//在弹出的对话框上加俩个按钮，以下的函数是对应的按钮的处理事件
	void yesButton(CCObject * object);
	void noButton(CCObject * object);
	//设置对话框的title
	void setTitle();
	//设置对话框的文本内容
	void setContent();
	//m_size代表的是对话框背景的大小
	CCSize m_size;
	//对话框的背景精灵
	CCSprite * m_bgSprite;
};
#endif

/*对话框场景类的具体实现*/
#include "PopScene.h"

CCScene * PopScene::scene()
{
	CCScene * scene = NULL;
	do
	{
		scene = CCScene::create();
		PopScene * layer = PopScene::create();
		scene->addChild(layer);
	}
	while(0);

	return scene;
}

bool PopScene::init()
{
	bool bRet = false;
	do
	{
		CC_BREAK_IF(!CCLayer::init());

		CCSize winSize = CCDirector::sharedDirector()->getWinSize();

		//设置这个层的背景图片，并且设置其位置为整个屏幕的中点
		CCSprite * background = CCSprite::create("background.png");
		m_bgSprite = background;
		background->setPosition(ccp(winSize.width/2,winSize.height/2));
		this->addChild(background);

		//获得背景图片的大小
		CCSize contentSize = background->getContentSize();
		m_size = contentSize;

		//添加俩个菜单在这个层中
		CCMenuItemImage * item1 = CCMenuItemImage::create("btn-play-normal.png",
			"btn-play-selected.png","",
			this,menu_selector(PopScene::yesButton));

		CCMenuItemImage * item2 = CCMenuItemImage::create("btn-highscores-normal.png",
			"btn-highscores-selected.png","",
			this,menu_selector(PopScene::noButton));

		CCMenu * menu = CCMenu::create(item1,item2,NULL);
		menu->alignItemsHorizontallyWithPadding(5);
		menu->setPosition(ccp(contentSize.width/2,contentSize.height/3));
		//kCCMenuHandlerPriority的值为-128，代表的是菜单按钮的触摸优先级
		//设置menu优先级，这里设置为普通menu的二倍减一，原因看下边
		menu->setTouchPriority(kCCMenuHandlerPriority*2-1);

		background->addChild(menu);

		//设置题目和文本内容
		this->setTitle();
		this->setContent();

		this->setTouchEnabled(true);
		bRet = true;
	}
	while(0);

	return bRet;
}

void PopScene::registerWithTouchDispatcher()
{
	//kCCMenuHandlerPriority=-128，将这个值设置为-128的二倍，可以比下边的层的优先级高
	//而且ccTouchBegan的返回值为true，说明其他的层将接受不到这个触摸消息了，只有这个层上边的
	//菜单的优先级比他还要打，所以它上边的菜单是可以接收到触摸消息的
	CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this,
		kCCMenuHandlerPriority*2,true);
}

bool PopScene::ccTouchBegan(CCTouch * touch,CCEvent * pevent)
{
	return true;
}

//点击菜单按钮的时候调用的事件处理函数
void PopScene::yesButton(CCObject * object)
{
	this->removeFromParentAndCleanup(true);
}

void PopScene::noButton(CCObject * object)
{
	this->removeFromParentAndCleanup(true);
}

//设置这个层的题目
void PopScene::setTitle()
{
	//CCLabelTTF * title = CCLabelTTF::create("Tips","",24);
	CCLabelBMFont * title = CCLabelBMFont::create("Tips","bitmapFontChinese.fnt");
	title->setPosition(ccp(m_size.width/2,m_size.height-title->getContentSize().height/2));
	m_bgSprite->addChild(title);
}

//设置层的内容
void PopScene::setContent()
{
	CCLabelTTF * content = CCLabelTTF::create("hello! everyone,welcome to www.jb51.net",
		"",24);
	content->setPosition(ccp(m_size.width/2,m_size.height/2));
	//设置ttf的文本域
	content->setDimensions(CCSize(this->m_size.width-60,this->m_size.height-100));
	//设置ttf的水平对齐方式
  content->setHorizontalAlignment(kCCTextAlignmentLeft);

	m_bgSprite->addChild(content);
}

//helloworld中按钮的回调函数
void HelloWorld::menuCloseCallback(CCObject* pSender)
{
	PopScene* popLayer = PopScene::create();
	this->addChild(popLayer);
}