Cocos2d-x 用cocos2d-x实现MoonWarriors（暂停和恢复的实现）(转)

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1. 实现原理
2. 我的实现
1. 1暂停
2. 2恢复

 

1.实现原理

原理不是通过调用 CCDirector::sharedDirector()->pause()，因为这个调用将会导致游戏彻底暂停，而无法返回运行状态！

而我们需要的是暂停的时候是游戏逻辑暂停，但是触摸事件监听不能停止，换句话说就是希望我们能控制哪一部分暂停，哪一部分不暂停。

有一种很繁琐的方法（看起来繁琐，代码不会很多），就是递归遍历需要暂停的层和精灵，调用pause()方法！

另一种简单的方法，就是调用需要暂停的层onExit()方法，这个方法在层中被复写了，其实就是删除重力加速的代理和按键代理。

 

<span style="font-size:14px;">void CCLayer::onExit()
{
    if( m_bIsTouchEnabled )
    {
        CCTouchDispatcher::sharedDispatcher()->removeDelegate(this);
        unregisterScriptTouchHandler();
    }

    // remove this layer from the delegates who concern Accelerometer Sensor
    if (m_bIsAccelerometerEnabled)
    {
        CCAccelerometer::sharedAccelerometer()->setDelegate(NULL);
    }

    // remove this layer from the delegates who concern the kaypad msg
    if (m_bIsKeypadEnabled)
    {
        CCKeypadDispatcher::sharedDispatcher()->removeDelegate(this);
    }

    CCNode::onExit();
}
</span>

<span style="font-size:14px;">void CCLayer::onExit()
{
	if( m_bIsTouchEnabled )
	{
		CCTouchDispatcher::sharedDispatcher()->removeDelegate(this);
        unregisterScriptTouchHandler();
	}

    // remove this layer from the delegates who concern Accelerometer Sensor
    if (m_bIsAccelerometerEnabled)
    {
        CCAccelerometer::sharedAccelerometer()->setDelegate(NULL);
    }

    // remove this layer from the delegates who concern the kaypad msg
    if (m_bIsKeypadEnabled)
    {
        CCKeypadDispatcher::sharedDispatcher()->removeDelegate(this);
    }

	CCNode::onExit();
}
</span>

2.我的实现

（1）暂停

自定义一个暂停层PauseLayer，在其init()方法中得到当前运行场景，遍历这个场景的子节点（一般都是层吧），调用子节点的onExit()方法即可！

<span style="font-size:14px;">bool PauseLayer::init()
{
    bool ret = false;

    do {
        CC_BREAK_IF(!CCLayerColor::initWithColor(ccc4f(255, 0, 0, 50)));

        CCArray *array = CCDirector::sharedDirector()->getRunningScene()->getChildren();
        CCObject *object = NULL;
        CCARRAY_FOREACH(array, object)
        {
            CCLayer *layer = (CCLayer*) object;
            layer->onExit();
        }

        ret = true;
    } while (0);

    return ret;
}</span>

<span style="font-size:14px;">bool PauseLayer::init()
{
    bool ret = false;
    
    do {
        CC_BREAK_IF(!CCLayerColor::initWithColor(ccc4f(255, 0, 0, 50)));
        
        CCArray *array = CCDirector::sharedDirector()->getRunningScene()->getChildren();
        CCObject *object = NULL;
        CCARRAY_FOREACH(array, object)
        {
            CCLayer *layer = (CCLayer*) object;
            layer->onExit();
        }
        
        ret = true;
    } while (0);
    
    return ret;
}</span>

（2）恢复

我这里只是简单的在触屏开始的事件中恢复的，与onExit()调用相反，调用onEnter()就可以实现了！

<span style="font-size:14px;">bool PauseLayer::ccTouchBegan(cocos2d::CCTouch *pTouch, cocos2d::CCEvent *pEvent)
{
    CCArray *array = CCDirector::sharedDirector()->getRunningScene()->getChildren();
    CCObject *object = NULL;
    CCARRAY_FOREACH(array, object)
    {
        CCLayer* layer = (CCLayer*) object;
        layer->onEnter();
    }

    this->removeFromParentAndCleanup(false);

    return true;
}</span>