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

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

#include "stdafx.h"
#include "DataHandler.h"

#include "DropTarget.h"


#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

namespace SbjCore
{
	namespace DragNDrop
	{
		struct DataHandlerImpl
		{
			CLIPFORMAT theCF;
			
			DataHandlerImpl(CLIPFORMAT cf) :
				theCF(cf)
			{
			}
			
			virtual ~DataHandlerImpl()
			{
			}
			
		};
		
		
		DataHandler::DataHandler(CLIPFORMAT cf /*= CF_TEXT*/, DropTarget* pDropTarget /*= NULL*/) :
			m_pImpl(new DataHandlerImpl(cf))
		{
			if (pDropTarget != NULL)
			{
				pDropTarget->AddHandler(cf, this);
			}
		}
		
		DataHandler::~DataHandler()
		{
			try 
			{
				delete m_pImpl;
			}
			catch (...)
			{
				ASSERT(FALSE);
			}
			
		}
		
		CLIPFORMAT DataHandler::GetCF()
		{
			return m_pImpl->theCF;
		}

		bool DataHandler::Handle(COleDataObject* pDataObject, DROPEFFECT dropEffect, CPoint pt)
		{
			return OnHandle(pDataObject, dropEffect, pt);
		}
		
		DROPEFFECT DataHandler::GetDropEffect(COleDataObject* pDataObject, DWORD dwKeyState, CPoint pt)
		{
			return OnGetDropEffect(pDataObject, dwKeyState, pt);
		}
		
		DROPEFFECT DataHandler::OnGetDropEffect(COleDataObject* pDataObject, DWORD dwKeyState, CPoint pt)
		{
			pDataObject;
			pt;
			DROPEFFECT dropEffect;
			if ((dwKeyState & (MK_CONTROL|MK_SHIFT)) == (MK_CONTROL|MK_SHIFT))
				dropEffect = DROPEFFECT_SCROLL|DROPEFFECT_LINK;
			// check for force copy
			else if ((dwKeyState & MK_CONTROL) == MK_CONTROL)
				dropEffect = DROPEFFECT_SCROLL|DROPEFFECT_COPY;
			// check for force move
			else if ((dwKeyState & MK_ALT) == MK_ALT ||
				(dwKeyState & MK_SHIFT) == MK_SHIFT)
				dropEffect = DROPEFFECT_SCROLL|DROPEFFECT_MOVE;
			// default -- recommended action is move
			else
				dropEffect = DROPEFFECT_SCROLL|DROPEFFECT_MOVE;
			return dropEffect;
		}
		
		
	}
}

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