text: /*****************************************************************************
  *                                                                            *
  *  PrimeSense Sensor 5.x Alpha                                               *
  *  Copyright (C) 2012 PrimeSense Ltd.                                        *
  *                                                                            *
  *  This file is part of PrimeSense Sensor                                    *
  *                                                                            *
  *  Licensed under the Apache License, Version 2.0 (the "License");           *
  *  you may not use this file except in compliance with the License.          *
  *  You may obtain a copy of the License at                                   *
  *                                                                            *
  *      http://www.apache.org/licenses/LICENSE-2.0                            *
  *                                                                            *
  *  Unless required by applicable law or agreed to in writing, software       *
  *  distributed under the License is distributed on an "AS IS" BASIS,         *
  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  *
  *  See the License for the specific language governing permissions and       *
  *  limitations under the License.                                            *
  *                                                                            *
  *****************************************************************************/
  //---------------------------------------------------------------------------
  // Includes
  //---------------------------------------------------------------------------
  #include "XnIntPropertySynchronizer.h"
  
  //---------------------------------------------------------------------------
  // Types
  //---------------------------------------------------------------------------
  class XnIntSynchronizerCookie
  {
  public:
  	XnIntSynchronizerCookie(XnIntProperty* pSource, XnIntProperty* pDestination, XnIntPropertyConvertCallback pConvertFunc) :
  	  pSource(pSource), pDestination(pDestination), pConvertFunc(pConvertFunc)
  	{}
  
  	XnIntProperty* pSource;
  	XnIntProperty* pDestination;
  	XnIntPropertyConvertCallback pConvertFunc;
  	XnCallbackHandle hCallback;
  };
  
  //---------------------------------------------------------------------------
  // Code
  //---------------------------------------------------------------------------
  XnIntPropertySynchronizer::XnIntPropertySynchronizer()
  {
  }
  
  XnIntPropertySynchronizer::~XnIntPropertySynchronizer()
  {
  	for (CookiesList::Iterator it = m_Cookies.Begin(); it != m_Cookies.End(); ++it)
  	{
  		XnIntSynchronizerCookie* pSynchData = (XnIntSynchronizerCookie*)*it;
  		pSynchData->pSource->OnChangeEvent().Unregister(pSynchData->hCallback);
  		XN_DELETE(pSynchData);
  	}
  }
  
  XnStatus XN_CALLBACK_TYPE IntPropertyValueChangedCallback(const XnProperty* pSender, void* pCookie)
  {
  	XnStatus nRetVal = XN_STATUS_OK;
  	
  	// get the property current value
  	XnIntProperty* pIntProp = (XnIntProperty*)pSender;
  
  	XnUInt64 nNewValue;
  	nRetVal = pIntProp->GetValue(&nNewValue);
  	XN_IS_STATUS_OK(nRetVal);
  
  	XnIntSynchronizerCookie* pSynchData = (XnIntSynchronizerCookie*)pCookie;
  
  	XnUInt64 nDestValue;
  
  	// convert the value if needed
  	if (pSynchData->pConvertFunc != NULL)
  	{
  		nRetVal = pSynchData->pConvertFunc(nNewValue, &nDestValue);
  		XN_IS_STATUS_OK(nRetVal);
  	}
  	else
  	{
  		nDestValue = nNewValue;
  	}
  
  	// now set the new value
  	nRetVal = pSynchData->pDestination->UnsafeUpdateValue(nDestValue);
  	XN_IS_STATUS_OK(nRetVal);
  
  	return (XN_STATUS_OK);
  }
  
  XnStatus XnIntPropertySynchronizer::RegisterSynchronization(XnIntProperty* pSource, XnIntProperty* pDestination, XnIntPropertyConvertCallback pConvertFunc /* = NULL */)
  {
  	XnStatus nRetVal = XN_STATUS_OK;
  
  	XnIntSynchronizerCookie* pCookie;
  	XN_VALIDATE_NEW(pCookie, XnIntSynchronizerCookie, pSource, pDestination, pConvertFunc);
  
  	nRetVal = m_Cookies.AddFirst(pCookie);
  	if (nRetVal != XN_STATUS_OK)
  	{
  		XN_DELETE(pCookie);
  		return (nRetVal);
  	}
  
  	nRetVal = pSource->OnChangeEvent().Register(IntPropertyValueChangedCallback, pCookie, pCookie->hCallback);
  	if (nRetVal != XN_STATUS_OK)
  	{
  		XN_DELETE(pCookie);
  		m_Cookies.Remove(m_Cookies.Begin());
  		return (nRetVal);
  	}
  	
  	return (XN_STATUS_OK);
  }
  
  