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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.   

  93.   

  94.     if (isEffect) {  

  95.         SimpleAudioEngine::getInstance()->playEffect("sound/Blip.wav");                  ③  

  96.     }  

  97.   

  98.   

  99.     if (soundToggleMenuItem->getSelectedIndex() == 1) {//选中状态Off -> On                ④  

  100.         isEffect = false;  

  101.     } else {  

  102.         isEffect = true;  

  103.         SimpleAudioEngine::getInstance()->playEffect("sound/Blip.wav");                  ⑤  

  104.     }  

  105. }  

  106.   

  107.   

  108. void Setting::menuMusicToggleCallback(Ref* pSender)                         ⑥  

  109. {  

  110.     auto musicToggleMenuItem = (MenuItemToggle*)pSender;  

  111.     log("musicToggleMenuItem %d", musicToggleMenuItem->getSelectedIndex());  

  112.       

  113.     if (musicToggleMenuItem->getSelectedIndex() == 1) {//选中状态Off -> On                ⑦  

  114.         SimpleAudioEngine::getInstance()->stopBackgroundMusic("sound/Synth.mp3");  

  115.     } else {  

  116.         SimpleAudioEngine::getInstance()->playBackgroundMusic("sound/Synth.mp3");  

  117.     }  

  118.     if (isEffect) {  

  119.         SimpleAudioEngine::getInstance()->playEffect("sound/Blip.wav");                  ⑧  

  120.     }  

  121. }  

  122.   

  123.   

  124. void Setting::onEnter()  

  125. {  

  126.     Layer::onEnter();  

  127.     log("Setting onEnter");  

  128. }  

  129.   

  130.   

  131. void Setting::onEnterTransitionDidFinish()  

  132. {  

  133.     Layer::onEnterTransitionDidFinish();  

  134.     log("Setting onEnterTransitionDidFinish");    

  135.     isEffect = true;  

  136.     //播放  

  137.     SimpleAudioEngine::getInstance()->playBackgroundMusic("sound/Synth.mp3", true);      ⑨  

  138. }  

  139.   

  140.   

  141. void Setting::onExit()  

  142. {  

  143.     Layer::onExit();  

  144.     log("Setting onExit");    

  145. }  

  146.   

  147.   

  148. void Setting::onExitTransitionDidStart()  

  149. {  

  150.     Layer::onExitTransitionDidStart();  

  151.     log("Setting onExitTransitionDidStart");  

  152. }  

  153.   

  154.   

  155. void Setting::cleanup()  

  156. {  

  157.     Layer::cleanup();  

  158.     log("Setting cleanup");   

  159.     //停止  

  160.     SimpleAudioEngine::getInstance()->stopBackgroundMusic("sound/Synth.mp3");            ⑩  

  161. }  



上述代码第①、③、⑧行是在判断isEffect为true(音效播放开关打开)情况下播放音效。
代码第②行menuSoundToggleCallback是用户点击音效开发按钮时候回调函数,其中第④行代码是判断是否按钮状态从Off -> On,如果是则将开关变量isEffect 设置为false,否则为true,而且通过第⑤行代码SimpleAudioEngine::getInstance()->playEffect("sound/Blip.wav")播放一次音效。
代码第⑥行menuMusicToggleCallback是用户点击背景音乐按钮时候回调函数,其中第⑦行代码是判断是否按钮状态从Off -> On,如果是则停止播放背景音乐,否则为开始播放。

第⑧行代码是onEnterTransitionDidFinish()函数中播放背景音乐。第⑨行代码是cleanup()函数中停止播放背景音乐。

 

 

 

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