The SBJ MVC Framework - The Model, from Abstraction to Realization

//------------------------------------------------------------------------------
// $Workfile: Handler.h $
// $Header:  $
//
//	Copyright � 2008 SbjCat
// All rights reserved.
//
//
// *** Authors ***
//	 Steve Johnson
//
// $Revision: $
//
//-----------------------------------------------------------------------------

#pragma once

namespace SbjCore
{
	namespace UndoRedo
	{
		/**
			Handler is a pure virtual base class.  Derivatives handle the
			details of performing any undo or redo of an action.  Derivatives 
			should make their dtor protected to force dynamic allocation as these 
			are pushed onto the UndoRedoMgr's stack, and once there, the manager
			handles deletion once the Handler is no longer part of the UndoRedo 
			process.  
		*/
		class AFX_EXT_CLASS Handler
		{
		public:
			virtual ~Handler(void);
			
		public:
			bool HandleUndo();
			bool HandleRedo(); 

			LPCTSTR GetHandlerName() const;
			
		private:
			virtual bool OnHandleUndo() = 0;
			virtual bool OnHandleRedo() = 0;

			virtual LPCTSTR OnGetHandlerName() const = 0;
			
		};
	}
}


//*** Modification History ***
// $Log:  $