RedCore/cocos2d/cocos/deprecated/CCNotificationCenter.cpp

/****************************************************************************
Copyright (c) 2011      Erawppa
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2017 Chukong Technologies Inc.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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****************************************************************************/

#include "deprecated/CCNotificationCenter.h"

#include <string>

#include "base/CCScriptSupport.h"
#include "deprecated/CCArray.h"

using namespace std;

NS_CC_BEGIN

static __NotificationCenter *s_sharedNotifCenter = nullptr;

__NotificationCenter::__NotificationCenter()
: _scriptHandler(0)
{
    _observers = __Array::createWithCapacity(3);
    _observers->retain();
}

__NotificationCenter::~__NotificationCenter()
{
    _observers->release();
}

__NotificationCenter *__NotificationCenter::getInstance()
{
    if (!s_sharedNotifCenter)
    {
        s_sharedNotifCenter = new (std::nothrow) __NotificationCenter;
    }
    return s_sharedNotifCenter;
}

void __NotificationCenter::destroyInstance()
{
    CC_SAFE_RELEASE_NULL(s_sharedNotifCenter);
}

// FIXME:: deprecated
__NotificationCenter *__NotificationCenter::sharedNotificationCenter(void)
{
    return __NotificationCenter::getInstance();
}

// FIXME:: deprecated
void __NotificationCenter::purgeNotificationCenter(void)
{
    __NotificationCenter::destroyInstance();
}

//
// internal functions
//
bool __NotificationCenter::observerExisted(Ref *target, const std::string& name, Ref *sender)
{
    Ref* obj = nullptr;
    CCARRAY_FOREACH(_observers, obj)
    {
        NotificationObserver* observer = (NotificationObserver*) obj;
        if (!observer)
            continue;
        
        if (observer->getName() == name && observer->getTarget() == target && observer->getSender() == sender)
            return true;
    }
    return false;
}

//
// observer functions
//
void __NotificationCenter::addObserver(Ref *target, 
                                       SEL_CallFuncO selector,
                                       const std::string& name,
                                       Ref *sender)
{
    if (this->observerExisted(target, name, sender))
        return;
    
    NotificationObserver *observer = new (std::nothrow) NotificationObserver(target, selector, name, sender);
    if (!observer)
        return;
    
    observer->autorelease();
    _observers->addObject(observer);
}

void __NotificationCenter::removeObserver(Ref *target, const std::string& name)
{
    Ref* obj = nullptr;
    CCARRAY_FOREACH(_observers, obj)
    {
        NotificationObserver* observer = static_cast<NotificationObserver*>(obj);
        if (!observer)
            continue;
        
        if (observer->getName() == name && observer->getTarget() == target)
        {
            _observers->removeObject(observer);
            return;
        }
    }
}

int __NotificationCenter::removeAllObservers(Ref *target)
{
    Ref *obj = nullptr;
    __Array *toRemove = __Array::create();

    CCARRAY_FOREACH(_observers, obj)
    {
        NotificationObserver *observer = static_cast<NotificationObserver *>(obj);
        if (!observer)
            continue;

        if (observer->getTarget() == target)
        {
            toRemove->addObject(observer);
        }
    }

    _observers->removeObjectsInArray(toRemove);
    return static_cast<int>(toRemove->count());
}

void __NotificationCenter::registerScriptObserver(Ref *target, int handler,const std::string& name)
{
    
    if (this->observerExisted(target, name, nullptr))
        return;
    
    NotificationObserver *observer = new (std::nothrow) NotificationObserver(target, nullptr, name, nullptr);
    if (!observer)
        return;
    
    observer->setHandler(handler);
    observer->autorelease();
    _observers->addObject(observer);
}

void __NotificationCenter::unregisterScriptObserver(Ref *target,const std::string& name)
{        
    Ref* obj = nullptr;
    CCARRAY_FOREACH(_observers, obj)
    {
        NotificationObserver* observer = static_cast<NotificationObserver*>(obj);
        if (!observer)
            continue;
            
        if ( observer->getName() == name && observer->getTarget() == target)
        {
            _observers->removeObject(observer);
        }
    }
}

void __NotificationCenter::postNotification(const std::string& name, Ref *sender)
{
    __Array* ObserversCopy = __Array::createWithCapacity(_observers->count());
    ObserversCopy->addObjectsFromArray(_observers);
    Ref* obj = nullptr;
    CCARRAY_FOREACH(ObserversCopy, obj)
    {
        NotificationObserver* observer = static_cast<NotificationObserver*>(obj);
        if (!observer)
            continue;
        
        if (observer->getName() == name && (observer->getSender() == sender || observer->getSender() == nullptr || sender == nullptr))
        {
            if (0 == observer->getHandler())
            {
                observer->performSelector(sender);
            }
        }
    }
}

void __NotificationCenter::postNotification(const std::string& name)
{
    this->postNotification(name,nullptr);
}

int __NotificationCenter::getObserverHandlerByName(const std::string& name)
{
    if (name.empty())
    {
        return 0;
    }
    
    Ref* obj = nullptr;
    CCARRAY_FOREACH(_observers, obj)
    {
        NotificationObserver* observer = static_cast<NotificationObserver*>(obj);
        if (nullptr == observer)
            continue;
        
        if ( observer->getName() == name )
        {
            return observer->getHandler();
            break;
        }
    }
    
    return 0;
}

////////////////////////////////////////////////////////////////////////////////
///
/// NotificationObserver
///
////////////////////////////////////////////////////////////////////////////////
NotificationObserver::NotificationObserver(Ref *target, 
                                               SEL_CallFuncO selector,
                                               const std::string& name,
                                               Ref *sender)
{
    _target = target;
    _selector = selector;
    _sender = sender;
    
    _name = name;
    _handler = 0;
}

NotificationObserver::~NotificationObserver()
{

}

void NotificationObserver::performSelector(Ref *sender)
{
    if (_target)
    {
		if (sender) {
			(_target->*_selector)(sender);
		} else {
			(_target->*_selector)(_sender);
		}
    }
}

Ref *NotificationObserver::getTarget() const
{
    return _target;
}

SEL_CallFuncO NotificationObserver::getSelector() const
{
    return _selector;
}

const std::string& NotificationObserver::getName() const
{
    return _name;
}

Ref* NotificationObserver::getSender() const
{
    return _sender;
}

int NotificationObserver::getHandler() const
{
    return _handler;
}

void NotificationObserver::setHandler(int var)
{
    _handler = var;
}

NS_CC_END