/*
 * IADVSINK.CPP
 *
 * Implementation of the IAdviseSink interface for the Data User, Chapter 6
 *
 * Copyright (c)1993 Microsoft Corporation, All Rights Reserved
 *
 * Kraig Brockschmidt, Software Design Engineer
 * Microsoft Systems Developer Relations
 *
 * Internet  :  kraigb@microsoft.com
 * Compuserve:  >INTERNET:kraigb@microsoft.com
 */
#include "stdafx.h"
#include "iview.h" 
#include "util.h"
#include "idataobj.h"  
#include "iadvsink.h"

/*
 * CImpIAdviseSink::CImpIAdviseSink
 * CImpIAdviseSink::~CImpIAdviseSink
 *
 * Parameters (Constructor):
 *  pAV             LPAPPVARS to the application
 *
 */

CImpIAdviseSink::CImpIAdviseSink( CIDataObjectDlg FAR* lpIDOD )
    {
    m_cRef=0;
    m_pIDOD=lpIDOD;
    return;
    }

CImpIAdviseSink::~CImpIAdviseSink(void)
    {
    m_pIDOD->m_pSink = NULL; // make sure the container knows I've been deleted. SteveBl
    return;
    }




/*
 * CImpIAdviseSink::QueryInterface
 * CImpIAdviseSink::AddRef
 * CImpIAdviseSink::Release
 *
 * Purpose:
 *  IUnknown members for CImpIAdviseSink object.
 */

STDMETHODIMP CImpIAdviseSink::QueryInterface(REFIID riid, LPVOID FAR *ppv)
    {
    *ppv=NULL;

    //Any interface on this object is the object pointer.
    if (IsEqualIID(riid, IID_IUnknown) || IsEqualIID(riid, IID_IAdviseSink))
        *ppv=(LPVOID)this;

    /*
     * If we actually assign an interface to ppv we need to AddRef it
     * since we're returning a new pointer.
     */
    if (NULL!=*ppv)
        {
        ((LPUNKNOWN)*ppv)->AddRef();
        return NOERROR;
        }

    return ResultFromScode(E_NOINTERFACE);
    }


STDMETHODIMP_(ULONG) CImpIAdviseSink::AddRef(void)
    {
    return ++m_cRef;
    }


STDMETHODIMP_(ULONG) CImpIAdviseSink::Release(void)
    {
    ULONG   cRefT;

    cRefT=--m_cRef;

    if (0==cRefT)
        delete this;

    return cRefT;
    }




/*
 * IAdviseSink::OnDataChange
 *
 * Purpose:
 *  Notifes the advise sink that data changed in a data object.  On
 *  this message you may request a new data rendering and update your
 *  displays as necessary.  Any data sent to this function is owned
 *  by the caller, not by this advise sink!
 *
 *  All Advise Sink methods should be considered asynchronous and therefore
 *  we should attempt no synchronous calls from within them to an EXE
 *  object.  If we do, we'll get RPC_E_CALLREJECTED as shown below.
 *
 * Parameters:
 *  pFE             LPFORMATETC describing format that changed
 *  pSTM            LPSTGMEDIUM providing the medium in which the data
 *                  is provided.
 *
 * Return Value:
 *  None
 */

STDMETHODIMP_(void) CImpIAdviseSink::OnDataChange(LPFORMATETC pFE, LPSTGMEDIUM pSTM)
{
    BOOL        fUsable=TRUE;
    UINT        cf;

    //See if we're interested
    cf=pFE->cfFormat;

    if (!(DVASPECT_CONTENT & pFE->dwAspect))
        return;

/*
    //Check media types
    switch (cf)
    {
    #ifdef UNICODE
        case CF_UNICODETEXT:
    #else
        case CF_TEXT:
    #endif
            fUsable=(BOOL)(TYMED_HGLOBAL & pFE->tymed);
        break;
        case CF_BITMAP:
            fUsable=(BOOL)(TYMED_GDI & pFE->tymed);
        break;

        case CF_METAFILEPICT:
            fUsable=(BOOL)(TYMED_MFPICT & pFE->tymed);
        break;

        default:
        break;
    }

    if (!fUsable)
        return;
*/

    if (NULL==m_pIDOD->m_lpDO)
        return;

    // If we are doing a 'warm link' then the data does not come with the
    // OnDataChange.   Post a message back to ourselves so that we can
    // call GetData when it's convienient
    //
    if (m_pIDOD->m_advf & ADVF_NODATA)
    {
        if (m_pIDOD->m_fDoOnGetDataPosted == FALSE)
        {
            m_pIDOD->m_fDoOnGetDataPosted = TRUE ;
            PostMessage( m_pIDOD->m_hDlg, WM_COMMAND,  IDC_DOGETDATA, 0L ) ;
        }
        return ;
    }

    // for Hot links the data comes with the OnDataChange
    m_pIDOD->GotData( pFE, pSTM ) ;
    return ;
}

/*
 * IAdviseSink::OnViewChange
 *
 * Purpose:
 *  Notifes the advise sink that presentation data changed in the data
 *  object to which we're connected providing the right time to update
 *  displays using such presentations.
 *
 * Parameters:
 *  dwAspect        DWORD indicating which aspect has changed.
 *  lindex          LONG indicating the piece that changed.
 *
 * Return Value:
 *  None
 */

STDMETHODIMP_(void) CImpIAdviseSink::OnViewChange(DWORD , LONG )
    {
    return;
    }





/*
 * IAdviseSink::OnRename
 *
 * Purpose:
 *  Informs the advise sink that an IOleObject has been renamed, primarily
 *  when its linked.
 *
 * Parameters:
 *  pmk             LPMONIKER providing the new name of the object
 *
 * Return Value:
 *  None
 */

STDMETHODIMP_(void) CImpIAdviseSink::OnRename(LPMONIKER)
    {
    return;
    }






/*
 * IAdviseSink::OnSave
 *
 * Purpose:
 *  Informs the advise sink that the OLE object has been saved
 *  persistently.  The primary purpose of this is for containers that
 *  want to make optimizations for objects that are not in a saved
 *  state, so on this you have to disable such optimizations.
 *
 * Parameters:
 *  None
 *
 * Return Value:
 *  None
 */

STDMETHODIMP_(void) CImpIAdviseSink::OnSave(void)
    {
    return;
    }





/*
 * IAdviseSink::OnClose
 *
 * Purpose:
 *  Informs the advise sink that the OLE object has closed and is
 *  no longer bound in any way.  On this you typically change state
 *  variables and redraw shading, etc.
 *
 * Parameters:
 *  None
 *
 * Return Value:
 *  None
 */

STDMETHODIMP_(void) CImpIAdviseSink::OnClose(void)
    {
    return;
    }