Create a Universal Document Template which supports Dynamic Frame Window Layout

//*******************************************************************************
// COPYRIGHT NOTES
// ---------------
// This source code is a part of Tangram library.
// You may use, compile or redistribute it as part of your application 
// for free. You cannot redistribute it as a part of a software development 
// library without the agreement of the author. If the sources are 
// distributed along with the application, you should leave the original 
// copyright notes in the source code without any changes.
// This code can be used WITHOUT ANY WARRANTIES on your own risk.
// 
// For the latest updates to this library, check site:
// http://www.tangramdev.com
// 
// sunhui
//*******************************************************************************
// Documents.h : Declaration of the CDocuments

#ifndef __DOCUMENTS_H_
#define __DOCUMENTS_H_

#include "stdafx.h"
#include "resource.h"       // main symbols
class EnumDocuments;

/////////////////////////////////////////////////////////////////////////////
// CDocuments
class ATL_NO_VTABLE CDocuments : public CTangramDocuments,
	public CComObjectRootEx<CComSingleThreadModel>,
	public CComCoClass<CDocuments, &CLSID_Documents>,
	public IDispatchImpl<IDocuments, &IID_IDocuments, &LIBID_VisualFrameWorkLib>
{
	friend class EnumDocuments;
public:
	STDMETHOD(Connect)(/*[in]*/long TangramServerObj);
	virtual void AddToCollection(CTangramDoc *pDoc);
	virtual void RemoveFromCollection(CTangramDoc *pDoc);
	CDocuments()
	{
	}
	~CDocuments()
	{
	}

DECLARE_REGISTRY_RESOURCEID(IDR_DOCUMENTS)
DECLARE_NOT_AGGREGATABLE(CDocuments)

DECLARE_PROTECT_FINAL_CONSTRUCT()

BEGIN_COM_MAP(CDocuments)
	COM_INTERFACE_ENTRY(IDocuments)
	COM_INTERFACE_ENTRY(IDispatch)
END_COM_MAP()

	virtual void ClearCollection();
	HRESULT RemoveFromCollection(CString strName);
	HRESULT AddToCollection(IDocument* pDoc);

// IDocuments
	virtual int GetDocsCount();
	STDMETHOD(Add)(/*[out retval]*/IDocument** ppVal);
	STDMETHOD(Open)(/*[in]*/ BSTR FileName, /*[out, retval]*/ IDocument** ppVal);
	STDMETHOD(Item)(/*[in]*/ VARIANT Index, /*[out, retval]*/ IDocument** ppVal);
	STDMETHOD(get__NewEnum)(/*[out, retval]*/ IUnknown* *pVal);
	STDMETHOD(get_Count)(/*[out, retval]*/ long *pVal);

};

class EnumDocuments : public IEnumVARIANT
{
public:
	EnumDocuments(CDocuments* pDocs); //main constructor
	EnumDocuments(EnumDocuments* pEnum); //clone constructor

	//IUnknown methods
	STDMETHOD(QueryInterface)(REFIID riid, LPVOID* ppvObj);
	STDMETHOD_(ULONG, AddRef)() { return ++m_cRef; }
	STDMETHOD_(ULONG, Release)() { if (--m_cRef == 0) { delete this; return 0;} return m_cRef; }

	//IEnumVARIANT methods
	STDMETHOD(Next)(ULONG celt, VARIANT* rgvar, ULONG* celtFetched);
	STDMETHOD(Skip)(ULONG celt);
	STDMETHOD(Reset)();
	STDMETHOD(Clone)(IEnumVARIANT** ppenum);

private:
	ULONG m_cRef;
	CPtrList* m_plistDocs;
	POSITION m_posCur;
};
OBJECT_ENTRY_AUTO(__uuidof(Documents), CDocuments)

#endif //__DOCUMENTS_H_