/**********************************************************************
 *<
	FILE: hold.h

	DESCRIPTION:

	CREATED BY: Dan Silva

	HISTORY:

 *>	Copyright (c) 1994, All Rights Reserved.
 **********************************************************************/

#ifndef __HOLD__H__
#define __HOLD__H__

#define RESTOBJ_DOES_REFERENCE_POINTER		1
#define RESTOBJ_GOING_TO_DELETE_POINTER		2

class HoldStore;
class RestoreObj : public InterfaceServer {
	friend class HoldStore;
	friend class GenUndoObject;
	friend class CheckForFlush;
		RestoreObj *next,*prev;
	public:
		RestoreObj() { next = prev = NULL; }
   		virtual ~RestoreObj() {};
		virtual void Restore(int isUndo)=0;
		virtual void Redo()=0;
		virtual int Size() { return 1; }
		virtual void EndHold() { }
		virtual TSTR Description() { return TSTR(_T("---")); }
		virtual INT_PTR Execute(int cmd, ULONG_PTR arg1=0, ULONG_PTR arg2=0, ULONG_PTR arg3=0) {return -1;}
			// WIN64 Cleanup: Shuler
	};

class Hold : public BaseInterfaceServer {
  	HoldStore *holdStore, *holdList;
	int undoEnabled;
	int superLevel;
	int putCount;
	HoldStore *ResetStore();
	void Init();
	void AddOpToUndoMgr(TCHAR *name,int id);
	public:
		CoreExport Hold();
		CoreExport ~Hold();
		CoreExport void Put(RestoreObj *rob);
		CoreExport void Begin();
		CoreExport void Suspend();	  // temporarly suspend holding
		CoreExport int IsSuspended();
		CoreExport void Resume();    // resume holding
		CoreExport int	Holding();  // are we holding?
		CoreExport int  Restoring(int& isUndo);
		CoreExport int  Redoing();
		CoreExport int  RestoreOrRedoing();
		CoreExport void DisableUndo();  // prevents Undo when Accept is called.
		CoreExport void EnableUndo();
		CoreExport void Restore();  // Restore changes from holdStore. 
		CoreExport void Release();  // Tosses out holdStore. 

		// 3 ways to terminate the Begin()...
		CoreExport void End();  // toss holdStore.
		CoreExport void Accept(int nameID); // record Undo (if enabled), End();
		CoreExport void Accept(TCHAR *name);
		CoreExport void Cancel();   // Restore changes, End() 

		//		
		// Group several Begin-End lists into a single Super-group.
		CoreExport void SuperBegin();
		CoreExport void SuperAccept(int nameID);
		CoreExport void SuperAccept(TCHAR *name);
		CoreExport void SuperCancel();

		// Get the number of times Put() has been called in the current session of MAX
		CoreExport int GetGlobalPutCount();

	protected:
		friend HoldStore;
		unsigned flags;
		enum {
			kInRestore,
			kInUndo,
			kInRedo
		};
	};



extern CoreExport Hold theHold;

void CoreExport EnableUndoDebugPrintout(BOOL onoff);


#endif //__HOLD__H__