Cocos2d-x实例：设置背景音乐与音效-设置场景实现

设置场景SettingSetting.h文件代码如下

#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

#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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