#ifndef _MDGMessage
#define _MDGMessage
//
//-
// ==========================================================================
// Copyright (C) 1995 - 2006 Autodesk, Inc., and/or its licensors.  All 
// rights reserved.
// 
// The coded instructions, statements, computer programs, and/or related 
// material (collectively the "Data") in these files contain unpublished 
// information proprietary to Autodesk, Inc. ("Autodesk") and/or its 
// licensors,  which is protected by U.S. and Canadian federal copyright law 
// and by international treaties.
// 
// The Data may not be disclosed or distributed to third parties or be 
// copied or duplicated, in whole or in part, without the prior written 
// consent of Autodesk.
// 
// The copyright notices in the Software and this entire statement, 
// including the above license grant, this restriction and the following 
// disclaimer, must be included in all copies of the Software, in whole 
// or in part, and all derivative works of the Software, unless such copies 
// or derivative works are solely in the form of machine-executable object 
// code generated by a source language processor.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND. 
// AUTODESK DOES NOT MAKE AND HEREBY DISCLAIMS ANY EXPRESS OR IMPLIED 
// WARRANTIES INCLUDING, BUT NOT LIMITED TO, THE WARRANTIES OF 
// NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, 
// OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE. IN NO 
// EVENT WILL AUTODESK AND/OR ITS LICENSORS BE LIABLE FOR ANY LOST 
// REVENUES, DATA, OR PROFITS, OR SPECIAL, DIRECT, INDIRECT, OR 
// CONSEQUENTIAL DAMAGES, EVEN IF AUTODESK AND/OR ITS LICENSORS HAS 
// BEEN ADVISED OF THE POSSIBILITY OR PROBABILITY OF SUCH DAMAGES. 
// ==========================================================================
//+
//
// CLASS:    MDGMessage
//
// *****************************************************************************
//
// CLASS DESCRIPTION (MDGMessage)
//
// This class is used to register callbacks for dependency graph messages.
// There are 4 add callback methods which will add callbacks for the
// following messages
//     Time change
//     Node Added
//     Node Removed
//     Connection made or broken
//
// A filter can be specified for node added/removed messages. The default 
// node type is "dependNode" which matches all nodes.
// Each method returns an id which is used to remove the callback.
//
// To remove a callback use MMessage::removeCallback.
// All callbacks that are registered by a plug-in must be removed by that
// plug-in when it is unloaded. Failure to do so will result in a fatal error.
//
// *****************************************************************************

#if defined __cplusplus

// *****************************************************************************

// INCLUDED HEADER FILES


#include <maya/MMessage.h>
#include <maya/MString.h>

// *****************************************************************************

// DECLARATIONS

class MTime;
class MObject;
class MPlug;

#define kDefaultNodeType "dependNode"

// *****************************************************************************

// CLASS DECLARATION (MDGMessage)

/// Dependency graph messages. (OpenMaya) (OpenMaya.py) 
/**
*/
#if defined(_WIN32)
#pragma warning(disable: 4522)
#endif // _WIN32

class OPENMAYA_EXPORT MDGMessage : public MMessage
{ 
public:
	/// TimeChange callback
	static MCallbackId	addTimeChangeCallback(
								MMessage::MTimeFunction func,
								void * clientData = NULL,
								MStatus * ReturnStatus = NULL );

	/// ForceUpdate callback
	static MCallbackId  addForceUpdateCallback(
								MMessage::MTimeFunction func,
								void * clientData = NULL,
								MStatus * ReturnStatus = NULL );

	/// NodeAdded callback
	static MCallbackId	addNodeAddedCallback(
								MMessage::MNodeFunction func,
								const MString& nodeType = kDefaultNodeType,
								void * clientData = NULL,
								MStatus * ReturnStatus = NULL );

	/// NodeRemoved callback
	static MCallbackId	addNodeRemovedCallback(
								MMessage::MNodeFunction func,
								const MString& nodeType = kDefaultNodeType,
								void * clientData = NULL,
								MStatus * ReturnStatus = NULL );

	/// Connection callback
	static MCallbackId	addConnectionCallback(
								MMessage::MPlugFunction func,
								void * clientData = NULL,
								MStatus * ReturnStatus = NULL );

private: 
	static const char* className();
};

#if defined(_WIN32)
#pragma warning(default: 4522)
#endif // _WIN32

// *****************************************************************************

#endif /* __cplusplus */
#endif /* _MDGMessage */