首页 > 代码库 > Cocos2d-x实例:设置背景音乐与音效-设置场景实现
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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- #ifndef __Setting_SCENE_H__
- #define __Setting_SCENE_H__
- #include "cocos2d.h"
- #include "SimpleAudioEngine.h"
- class Setting : public cocos2d::Layer
- {
- bool isEffect; ①
- public:
- static cocos2d::Scene* createScene();
- virtual bool init();
- virtual void onEnter();
- virtual void onEnterTransitionDidFinish();
- virtual void onExit();
- virtual void onExitTransitionDidStart();
- virtual void cleanup();
- void menuSoundToggleCallback(cocos2d::Ref* pSender);
- void menuMusicToggleCallback(cocos2d::Ref* pSender);
- void menuOkCallback(cocos2d::Ref* pSender);
- CREATE_FUNC(Setting);
- };
- #endif // __Setting_SCENE_H__
- #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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- #include "SettingScene.h"
- USING_NS_CC;
- using namespace CocosDenshion;
- … …
- bool Setting::init()
- {
- if ( !Layer::init() )
- {
- return false;
- }
- log("Setting init");
- Size visibleSize = Director::getInstance()->getVisibleSize();
- Point origin = Director::getInstance()->getVisibleOrigin();
- Sprite *bg = Sprite::create("setting-back.png");
- bg->setPosition(Point(origin.x + visibleSize.width/2,
- origin.y + visibleSize.height /2));
- this->addChild(bg);
- //音效
- auto soundOnMenuItem = MenuItemImage::create(
- "on.png",
- "on.png");
- auto soundOffMenuItem = MenuItemImage::create(
- "off.png",
- "off.png");
- auto soundToggleMenuItem = MenuItemToggle::createWithCallback(
- CC_CALLBACK_1(Setting::menuSoundToggleCallback, this),
- soundOffMenuItem,
- soundOnMenuItem,
- NULL);
- soundToggleMenuItem->setPosition(Director::getInstance()->convertToGL(Point(818, 220)));
- //背景音乐
- auto musicOnMenuItem = MenuItemImage::create(
- "on.png",
- "on.png");
- auto musicOffMenuItem = MenuItemImage::create(
- "off.png",
- "off.png");
- auto musicToggleMenuItem = MenuItemToggle::createWithCallback(
- CC_CALLBACK_1(Setting::menuMusicToggleCallback, this),
- musicOffMenuItem,
- musicOnMenuItem,
- NULL );
- musicToggleMenuItem->setPosition(Director::getInstance()->convertToGL(Point(818, 362)));
- //Ok按钮
- auto okMenuItem = MenuItemImage::create(
- "ok-down.png",
- "ok-up.png",
- CC_CALLBACK_1(Setting::menuOkCallback, this));
- okMenuItem->setPosition(Director::getInstance()->convertToGL(Point(600, 510)));
- Menu* mn = Menu::create(soundToggleMenuItem, musicToggleMenuItem,okMenuItem, NULL);
- mn->setPosition(Point::ZERO);
- this->addChild(mn);
- return true;
- }
- void Setting::menuOkCallback(Ref* pSender)
- {
- Director::getInstance()->popScene();
- if (isEffect) {
- SimpleAudioEngine::getInstance()->playEffect("sound/Blip.wav"); ①
- }
- }
- void Setting::menuSoundToggleCallback(Ref* pSender) ②
- {
- auto soundToggleMenuItem = (MenuItemToggle*)pSender;
- log("soundToggleMenuItem %d", soundToggleMenuItem->getSelectedIndex());
- if (isEffect) {
- SimpleAudioEngine::getInstance()->playEffect("sound/Blip.wav"); ③
- }
- if (soundToggleMenuItem->getSelectedIndex() == 1) {//选中状态Off -> On ④
- isEffect = false;
- } else {
- isEffect = true;
- SimpleAudioEngine::getInstance()->playEffect("sound/Blip.wav"); ⑤
- }
- }
- void Setting::menuMusicToggleCallback(Ref* pSender) ⑥
- {
- auto musicToggleMenuItem = (MenuItemToggle*)pSender;
- log("musicToggleMenuItem %d", musicToggleMenuItem->getSelectedIndex());
- if (musicToggleMenuItem->getSelectedIndex() == 1) {//选中状态Off -> On ⑦
- SimpleAudioEngine::getInstance()->stopBackgroundMusic("sound/Synth.mp3");
- } else {
- SimpleAudioEngine::getInstance()->playBackgroundMusic("sound/Synth.mp3");
- }
- if (isEffect) {
- SimpleAudioEngine::getInstance()->playEffect("sound/Blip.wav"); ⑧
- }
- }
- void Setting::onEnter()
- {
- Layer::onEnter();
- log("Setting onEnter");
- }
- void Setting::onEnterTransitionDidFinish()
- {
- Layer::onEnterTransitionDidFinish();
- log("Setting onEnterTransitionDidFinish");
- isEffect = true;
- //播放
- SimpleAudioEngine::getInstance()->playBackgroundMusic("sound/Synth.mp3", true); ⑨
- }
- void Setting::onExit()
- {
- Layer::onExit();
- log("Setting onExit");
- }
- void Setting::onExitTransitionDidStart()
- {
- Layer::onExitTransitionDidStart();
- log("Setting onExitTransitionDidStart");
- }
- void Setting::cleanup()
- {
- Layer::cleanup();
- log("Setting cleanup");
- //停止
- SimpleAudioEngine::getInstance()->stopBackgroundMusic("sound/Synth.mp3"); ⑩
- }
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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