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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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#ifndef _XTDATAOBJECT_HXX_
#define _XTDATAOBJECT_HXX_


//------------------------------------------------------------------------
// includes
//------------------------------------------------------------------------

#if defined _MSC_VER
#pragma warning(push,1)
#endif
#include <windows.h>
#include <ole2.h>
#include <objidl.h>
#if defined _MSC_VER
#pragma warning(pop)
#endif

#include <vector>

// forward declaration
//class CWinClipbImpl;
class EnumFormatEtc;

/*--------------------------------------------------------------------------
	- the function principle of the windows clipboard:
	  a data provider offers all formats he can deliver on the clipboard
	  a clipboard client ask for the available formats on the clipboard
	  and decides if there is a format he can use
	  if there is one, he requests the data in this format
	  
	- This class inherits from IDataObject an so can be placed on the 
	  OleClipboard. The class wrapps a transferable object which is the 
	  original DataSource
	- DataFlavors offerd by this transferable will be translated into
	  appropriate clipboard formats 
	- if the transferable contains text data always text and unicodetext
	  will be offered or vice versa
	- text data will be automaticaly converted between text und unicode text
	- although the transferable may support text in different charsets
	  (codepages) only text in one codepage can be offered by the clipboard

----------------------------------------------------------------------------*/

class CXTDataObject : public IDataObject
{
public:
	CXTDataObject( );
    
	//-----------------------------------------------------------------
	// ole interface implementation
	//-----------------------------------------------------------------

    //IUnknown interface methods
    STDMETHODIMP           QueryInterface(REFIID iid, LPVOID* ppvObject);
    STDMETHODIMP_( ULONG ) AddRef( );
    STDMETHODIMP_( ULONG ) Release( );

    // IDataObject interface methods
    STDMETHODIMP GetData( LPFORMATETC pFormatetc, LPSTGMEDIUM pmedium );
    STDMETHODIMP GetDataHere( LPFORMATETC pFormatetc, LPSTGMEDIUM pmedium );
    STDMETHODIMP QueryGetData( LPFORMATETC pFormatetc );
    STDMETHODIMP GetCanonicalFormatEtc( LPFORMATETC pFormatectIn, LPFORMATETC pFormatetcOut );
    STDMETHODIMP SetData( LPFORMATETC pFormatetc, LPSTGMEDIUM pmedium, BOOL fRelease );
    STDMETHODIMP EnumFormatEtc( DWORD dwDirection, IEnumFORMATETC** ppenumFormatetc );
    STDMETHODIMP DAdvise( LPFORMATETC pFormatetc, DWORD advf, LPADVISESINK pAdvSink, DWORD* pdwConnection );
    STDMETHODIMP DUnadvise( DWORD dwConnection );
    STDMETHODIMP EnumDAdvise( LPENUMSTATDATA* ppenumAdvise );

	operator IDataObject*( );

private:

private:
	LONG m_nRefCnt;	
};

//------------------------------------------------------------------------
// 
//------------------------------------------------------------------------

class CEnumFormatEtc : public IEnumFORMATETC
{
public:
	CEnumFormatEtc( LPUNKNOWN pUnkDataObj );
    
    // IUnknown 
    STDMETHODIMP           QueryInterface( REFIID iid, LPVOID* ppvObject );
    STDMETHODIMP_( ULONG ) AddRef( );
    STDMETHODIMP_( ULONG ) Release( );

    //IEnumFORMATETC 
    STDMETHODIMP Next( ULONG celt, LPFORMATETC rgelt, ULONG* pceltFetched );
    STDMETHODIMP Skip( ULONG celt );
    STDMETHODIMP Reset( );
    STDMETHODIMP Clone( IEnumFORMATETC** ppenum );

private:
	LONG								m_nRefCnt;
	LPUNKNOWN							m_pUnkDataObj;
    ULONG								m_nCurrPos;	
};

typedef CEnumFormatEtc *PCEnumFormatEtc;

#endif