//-
// ==========================================================================
// Copyright (C) 1995 - 2005 Alias Systems Corp. and/or its licensors.  All 
// rights reserved. 
// 
// The coded instructions, statements, computer programs, and/or related 
// material (collectively the "Data") in these files are provided by Alias 
// Systems Corp. ("Alias") and/or its licensors for the exclusive use of the 
// Customer (as defined in the Alias Software License Agreement that 
// accompanies this Alias software). Such Customer has the right to use, 
// modify, and incorporate the Data into other products and to distribute such 
// products for use by end-users.
//  
// THE DATA IS PROVIDED "AS IS".  ALIAS HEREBY DISCLAIMS ALL WARRANTIES 
// RELATING TO THE DATA, INCLUDING, WITHOUT LIMITATION, ANY AND ALL EXPRESS OR 
// IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND/OR FITNESS FOR A 
// PARTICULAR PURPOSE. IN NO EVENT SHALL ALIAS BE LIABLE FOR ANY DAMAGES 
// WHATSOEVER, WHETHER DIRECT, INDIRECT, SPECIAL, OR PUNITIVE, WHETHER IN AN 
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, OR IN EQUITY, 
// ARISING OUT OF ACCESS TO, USE OF, OR RELIANCE UPON THE DATA.
// ==========================================================================
//+

//
// ShapeMonitor
//
// Author: Christian Laforte
//
// Data: March 2001
//

#ifndef _ShapeMonitor_
#define _ShapeMonitor_

#include <maya/MNodeMessage.h>
#include "AWarray.h"

class MSelectionList;

// Structure used to track monitored Maya nodes.
class MonitoredObject
{
public:
	MString mayaNodeName;
	MonitoredObject() { renamedCallbackId = 0; dirtyCallbackId = 0; }

	virtual ~MonitoredObject() {}
	MCallbackId renamedCallbackId;
	MCallbackId dirtyCallbackId;
};


class ShapeMonitor
{
public:

	// Return a pointer to the singleton node. 
	// It is created automatically if it doesn't already exist.
	static ShapeMonitor* instance();

	// Initialize the ShapeMonitor singleton. 
	// This frees internal data structures and detach any callbacks left,
	// and returns a fresh and clean ShapeMonitor instance.
	static ShapeMonitor* initialize();

	// Destroy the internal content of the ShapeMonitor singleton. 
	// This also detaches any callbacks left.
	static void destroy();

	// Watch the given node. This function will add an element in the monitored objects array,
	// and set callbacks on the node in order to get notified when the node changes.
	void watch(MString mayaNodeName, MonitoredObject* pMon);

	// Stop watching all nodes that correspond to the given unique texture name.
	// This function can also be used to stop watching all elements, by setting that argument to true.
	void stopWatching(MString mayaNodeName);

	// Stop watching all nodes.
	void stopWatchingAll();

	void stopWatchingUnselectedDagObjects(MSelectionList& selectedObjects);

private:

	// The constructor and destructor are private, to guarantee that client-side code cannot instance
	// more than one at a time.
	ShapeMonitor();
	~ShapeMonitor();

	// Pointer to the singleton private instance.
	static ShapeMonitor* privateInstance;


	// The list of currently monitored objects.
	AWarray< MonitoredObject* > monitoredObjectsPtrArray;

	// Find a monitored object according to its node name.
	// This is used to ensure that we don't store duplicates in the list.
	MonitoredObject* retrieveMonitorObject(MString nodeName);

	// Callback functions. Those are called, respectively, when a node is dirty (has changed substantially),
	// or when a node is renamed.
	static void watchedObjectDirtyCallback( void* clientData );
	static void watchedObjectRenamedCallback( MObject & node, void* clientData );

	void removeCallbacks(MonitoredObject *mon);
};

#endif // _ShapeMonitor_