windows-server-2003/inetcore/mshtml/tried/triedctl/triedsnk.h

//	Event sink for TriEdit/Trident
//	Copyright (c)1997-1999 Microsoft Corporation, All Rights Reserved
//	Van Kichline



//	Create an event sink impl, then immediately call SetOwner with, in this case,
//	a pointer to a CProxyFrame, implementing OnTriEditEvent.
//	It would be better to require an interface on the OnTriEditEvent when time allows.
//	The lifetime of the CProxyFrame is managed by the CTriEditEventSink, below.
//
//	OnTriEditEvent will be called with the following DISPIDs for Document events:
//		DISPID_HTMLDOCUMENTEVENTS_ONHELP:
//		DISPID_HTMLDOCUMENTEVENTS_ONCLICK:
//		DISPID_HTMLDOCUMENTEVENTS_ONDBLCLICK:
//		DISPID_HTMLDOCUMENTEVENTS_ONKEYDOWN:
//		DISPID_HTMLDOCUMENTEVENTS_ONKEYUP:
//		DISPID_HTMLDOCUMENTEVENTS_ONKEYPRESS:
//		DISPID_HTMLDOCUMENTEVENTS_ONMOUSEMOVE:
//		DISPID_HTMLDOCUMENTEVENTS_ONMOUSEDOWN:
//		DISPID_HTMLDOCUMENTEVENTS_ONMOUSEUP:
//		DISPID_HTMLDOCUMENTEVENTS_ONREADYSTATECHANGE:
//
//	Changes: more versital implementation allows creating sinks for various event interfaces.
//	The interface IID is sent along to OnTriEditEvent.
//
class ATL_NO_VTABLE CTriEditEventSinkImpl :
	public CComObjectRootEx<CComSingleThreadModel>,
	public IDispatch
{
public:
BEGIN_COM_MAP(CTriEditEventSinkImpl)
	COM_INTERFACE_ENTRY(IDispatch)
END_COM_MAP()

	CTriEditEventSinkImpl ()
	{
		m_pFR = NULL;
	}

	void SetOwner ( CProxyFrame* pFR, const GUID& iidEventInterface )
	{
		_ASSERTE ( pFR );
		_ASSERTE ( NULL == m_pFR );
		if ( NULL == m_pFR )
		{
			m_pFR = pFR;
			m_iidEventInterface = iidEventInterface;
		}
	}

	STDMETHOD(GetTypeInfoCount) ( UINT * )
	{
		_ASSERTE ( FALSE );
		return E_NOTIMPL;
	}

	STDMETHOD(GetTypeInfo) ( UINT, LCID, ITypeInfo ** )
	{
		_ASSERTE ( FALSE );
		return E_NOTIMPL;
	}

	STDMETHOD(GetIDsOfNames) ( REFIID, OLECHAR **, UINT, LCID, DISPID * )
	{
		_ASSERTE ( FALSE );
		return E_NOTIMPL;
	}

	STDMETHOD(Invoke) ( DISPID dispid, REFIID, LCID, USHORT, DISPPARAMS *, VARIANT *, EXCEPINFO *, UINT * )
	{
		HRESULT	hr = E_UNEXPECTED;
		_ASSERTE ( m_pFR );
		if ( NULL != m_pFR )
		{
			hr = m_pFR->OnTriEditEvent ( m_iidEventInterface, dispid );
		}
		return hr;
	}

private:
	CProxyFrame*	m_pFR;
	GUID			m_iidEventInterface;
};


//	This class manages hooking up an event sink on Trident using CTriEditEventSinkImpl above.
//	The sink is advised and unadvised by this class, making management simple.
//	CProxyFrame must implement OnTriEditEvent.
//
class CTriEditEventSink
{
public:
	CTriEditEventSink ( CProxyFrame* pFR, GUID iidEventInterface ) :
	  m_piConPt ( NULL ), m_dwCookie ( 0 ), m_pSink ( NULL ), m_iidEventInterface ( iidEventInterface )
	{
		_ASSERTE ( pFR );
		m_pFR = pFR;
		if ( NULL != m_pFR )
		{
			m_pFR->AddRef ();
			m_pSink = new CComObject<CTriEditEventSinkImpl>;
			_ASSERTE ( m_pSink );
			m_pSink->AddRef ();
			m_pSink->SetOwner ( m_pFR, m_iidEventInterface );
			m_bfSunk = FALSE;
		}
	}

	~CTriEditEventSink ()
	{
		_ASSERTE ( m_pFR );

		Unadvise ();
		
		if ( NULL != m_pSink )
		{
			m_pSink->Release ();
			m_pSink = NULL;
		}

		if ( NULL != m_pFR )
		{
			m_pFR->Release ();
			m_pFR = NULL;
		}
	}

	HRESULT Advise ( IUnknown* pUnk )
	{
		HRESULT hr	= E_FAIL;
		_ASSERTE ( pUnk );
		_ASSERTE ( m_pFR );
		_ASSERTE ( m_pSink );

		if ( NULL == pUnk )
		{
			_ASSERTE ( FALSE );
			return E_UNEXPECTED;
		}

		if ( m_bfSunk )
		{
			_ASSERTE ( FALSE );
			return E_UNEXPECTED;
		}

		CComQIPtr<IConnectionPointContainer, &IID_IConnectionPointContainer>picpc ( pUnk );
		if ( picpc )
		{
			hr = picpc->FindConnectionPoint ( m_iidEventInterface, &m_piConPt );
			if ( SUCCEEDED ( hr ) )
			{
				hr = m_piConPt->Advise ( static_cast<IDispatch *>(m_pSink), &m_dwCookie);
				_ASSERTE ( SUCCEEDED ( hr ) );
				if ( SUCCEEDED ( hr ) )
				{
					m_bfSunk = TRUE;
				}
			}
		}
		return hr;
	}

	void Unadvise ()
	{
		if ( !m_bfSunk )
		{
			return;
		}

		if ( ( NULL != m_pSink ) && ( NULL != m_piConPt ) )
		{
			m_piConPt->Unadvise ( m_dwCookie );
			m_bfSunk = FALSE;
				
		}
		if ( NULL != m_piConPt )
		{
			m_piConPt->Release ();
			m_piConPt = NULL;
		}
	}

private:
	CTriEditEventSinkImpl*	m_pSink;
	IConnectionPoint*		m_piConPt;
	DWORD					m_dwCookie;
	CProxyFrame*			m_pFR;
	BOOL					m_bfSunk;
	GUID					m_iidEventInterface;
};