Cocos2d-x实例：设置背景音乐与音效-设置场景实现

设置场景（Setting），Setting.h文件代码如下：

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1. #ifndef __Setting_SCENE_H__  
2. #define __Setting_SCENE_H__  
3.   
4.   
5. #include "cocos2d.h"  
6. #include "SimpleAudioEngine.h"  
7.   
8.   
9. class Setting : public cocos2d::Layer  
10. {  
11.     bool isEffect;                                                      ①  
12. public:  
13.     static cocos2d::Scene* createScene();  
14.     virtual bool init();    
15.     virtual void onEnter();  
16.     virtual void onEnterTransitionDidFinish();  
17.     virtual void onExit();  
18.     virtual void onExitTransitionDidStart();  
19.     virtual void cleanup();  
20.       
21.     void menuSoundToggleCallback(cocos2d::Ref* pSender);  
22.     void menuMusicToggleCallback(cocos2d::Ref* pSender);  
23.     void menuOkCallback(cocos2d::Ref* pSender);  
24.       
25.     CREATE_FUNC(Setting);  
26. };  
27.   
28.   
29. #endif // __Setting_SCENE_H__  
30.   
31.   
32. #define __HELLOWORLD_SCENE_H__  

上述代码第①是定义布尔类型成员变量isEffect，它用来保存现在是否允许音效，事实上是否允许音效和背景音乐播放状态应该持久化到文件中，由于我们还没有介绍数据持久化，所以我们采用isEffect变量记录状态，当我们在后面的章节学习完成数据持久化后，再保存它们状态。其它的代码与HelloWorld场景代码非常相似，这里不再赘述。Setting.cpp文件代码如下：

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1. #include "SettingScene.h"  
2.   
3.   
4. USING_NS_CC;  
5. using namespace CocosDenshion;  
6.   
7.   
8. … …  
9. bool Setting::init()  
10. {  
11.     if ( !Layer::init() )  
12.     {  
13.         return false;  
14.     }  
15.   
16.   
17.     log("Setting init");  
18.       
19.     Size visibleSize = Director::getInstance()->getVisibleSize();  
20.     Point origin = Director::getInstance()->getVisibleOrigin();  
21.   
22.   
23.     Sprite *bg = Sprite::create("setting-back.png");  
24.       
25.     bg->setPosition(Point(origin.x + visibleSize.width/2,  
26.                              origin.y + visibleSize.height /2));  
27.     this->addChild(bg);  
28.   
29.   
30.     //音效  
31.     auto soundOnMenuItem = MenuItemImage::create(  
32.                              "on.png",  
33.                              "on.png");  
34.     auto soundOffMenuItem = MenuItemImage::create(  
35.                              "off.png",  
36.                              "off.png");  
37.       
38.     auto soundToggleMenuItem = MenuItemToggle::createWithCallback(  
39.                                 CC_CALLBACK_1(Setting::menuSoundToggleCallback, this),   
40.                                                 soundOffMenuItem,  
41.                                                 soundOnMenuItem,   
42.                                                 NULL);  
43.     soundToggleMenuItem->setPosition(Director::getInstance()->convertToGL(Point(818, 220)));  
44.       
45.     //背景音乐  
46.     auto musicOnMenuItem  = MenuItemImage::create(  
47.                              "on.png",  
48.                              "on.png");  
49.     auto musicOffMenuItem  = MenuItemImage::create(  
50.                              "off.png",  
51.                              "off.png");  
52.     auto musicToggleMenuItem = MenuItemToggle::createWithCallback(  
53.                                 CC_CALLBACK_1(Setting::menuMusicToggleCallback, this),  
54.                                                     musicOffMenuItem,  
55.                                                     musicOnMenuItem,  
56.                                                     NULL );  
57.     musicToggleMenuItem->setPosition(Director::getInstance()->convertToGL(Point(818, 362)));  
58.   
59.   
60.     //Ok按钮  
61.     auto okMenuItem  = MenuItemImage::create(   
62.                              "ok-down.png",  
63.                              "ok-up.png",  
64.                              CC_CALLBACK_1(Setting::menuOkCallback, this));  
65.   
66.   
67.     okMenuItem->setPosition(Director::getInstance()->convertToGL(Point(600, 510)));  
68.   
69.   
70.     Menu* mn = Menu::create(soundToggleMenuItem, musicToggleMenuItem,okMenuItem, NULL);  
71.     mn->setPosition(Point::ZERO);  
72.     this->addChild(mn);  
73.   
74.   
75.     return true;  
76. }  
77.   
78.   
79. void Setting::menuOkCallback(Ref* pSender)  
80. {  
81.     Director::getInstance()->popScene();  
82.     if (isEffect) {  
83.         SimpleAudioEngine::getInstance()->playEffect("sound/Blip.wav");                  ①  
84.     }  
85. }  
86.   
87.   
88. void Setting::menuSoundToggleCallback(Ref* pSender)                         ②  
89. {  
90.     auto soundToggleMenuItem = (MenuItemToggle*)pSender;  
91.     log("soundToggleMenuItem %d", soundToggleMenuItem->getSelectedIndex());  
92. border-style: none none none solid; border-left-width: 3px; border-left-color: #6ce26c; background-color: #f8f8f8; line-height: 18px; margin-bottom: 0px !important; margin-left: 0px !important; padding-right: 3px !important; padding