document.cpp

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/*
 * DOCUMENT.CPP
 * Cosmo Chapter 23
 *
 * Implementation of the CCosmoDoc derivation of CDocument as
 * well as an implementation of CPolylineAdviseSink.
 *
 * Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved
 *
 * Kraig Brockschmidt, Microsoft
 * Internet  :  [e-mail]
 * Compuserve:  >INTERNET:[e-mail]
 */


#include "cosmo.h"


/*
 * CCosmoDoc::CCosmoDoc
 * CCosmoDoc::~CCosmoDoc
 *
 * Constructor Parameters:
 *  hInst           HINSTANCE of the application.
 *  pFR             PCFrame of the frame object.
 *  pAdv            PCDocumentAdviseSink to notify on events
 */

CCosmoDoc::CCosmoDoc(HINSTANCE hInst, PCFrame pFR
    , PCDocumentAdviseSink pAdv)
    : CDocument(hInst, pFR, pAdv)
    {
    m_pPL=NULL;
    m_pPLAdv=NULL;
    m_uPrevSize=SIZE_RESTORED;

    m_pDropTarget=NULL;
    m_fDragSource=FALSE;

    m_cfEmbedSource=RegisterClipboardFormat(CFSTR_EMBEDSOURCE);
    m_cfObjectDescriptor=RegisterClipboardFormat
        (CFSTR_OBJECTDESCRIPTOR);

    m_pFigure=NULL;
    m_pMoniker=NULL;
    m_dwRegROT=0L;

    m_cfLinkSource=RegisterClipboardFormat(CFSTR_LINKSOURCE);
    m_cfLinkSrcDescriptor=RegisterClipboardFormat
        (CFSTR_LINKSRCDESCRIPTOR);

    return;
    }


CCosmoDoc::~CCosmoDoc(void)
    {
    //Make sure the object is saved
    m_pFigure->SendAdvise(OBJECTCODE_SAVEOBJECT);
    m_pFigure->SendAdvise(OBJECTCODE_HIDEWINDOW);
    m_pFigure->SendAdvise(OBJECTCODE_CLOSED);

    //If the document is reg'd as running, revoke and free the moniker
    INOLE_RevokeAsRunning(&m_dwRegROT);

    if (NULL!=m_pMoniker)
        m_pMoniker->Release();

    if (NULL!=m_pFigure)
        {
        m_pFigure->AddRef();
        CoDisconnectObject(m_pFigure, 0L);
        m_pFigure->Release();   //Starts shutdown if necessary.
        delete m_pFigure;
        }

    //Clean up the allocations we did in Init
    if (NULL!=m_pPL)
        delete m_pPL;

    if (NULL!=m_pPLAdv)
        delete m_pPLAdv;

    return;
    }






/*
 * CCosmoDoc::Init
 *
 * Purpose:
 *  Initializes an already created document window.  The client
 *  actually creates the window for us, then passes that here for
 *  further initialization.
 *
 * Parameters:
 *  pDI             PDOCUMENTINIT containing initialization
 *                  parameters.
 *
 * Return Value:
 *  BOOL            TRUE if the function succeeded, FALSE otherwise.
 */

BOOL CCosmoDoc::Init(PDOCUMENTINIT pDI)
    {
    RECT        rc;

    //Change the stringtable range to our customization.
    pDI->idsMin=IDS_DOCUMENTMIN;
    pDI->idsMax=IDS_DOCUMENTMAX;

    //Do default initialization
    if (!CDocument::Init(pDI))
        return FALSE;

    //Add the Polyline stuff we need.
    m_pPLAdv=new CPolylineAdviseSink(this);
    m_pPL   =new CPolyline(m_hInst);

    //Attempt to create our contained Polyline.
    GetClientRect(m_hWnd, &rc);
    InflateRect(&rc, -8, -8);

    if (!m_pPL->Init(m_hWnd, &rc, WS_CHILD | WS_VISIBLE
        , ID_POLYLINE, m_pPLAdv))
        return FALSE;

    m_pDropTarget=new CDropTarget(this);

    if (NULL!=m_pDropTarget)
        {
        m_pDropTarget->AddRef();
        CoLockObjectExternal(m_pDropTarget, TRUE, FALSE);
        RegisterDragDrop(m_hWnd, m_pDropTarget);
        }

    m_pFigure=new CFigure(ObjectDestroyed, this);

    if (NULL==m_pFigure)
        return FALSE;

    //We created an object, so count it.
    g_cObj++;

    if (!m_pFigure->Init())
        return FALSE;

    return TRUE;
    }







/*
 * CCosmoDoc::FMessageHook
 *
 * Purpose:
 *  Processes WM_SIZE for the document so we can resize
 *  the Polyline.
 *
 * Parameters:
 *  <WndProc Parameters>
 *  pLRes           LRESULT * in which to store the return
 *                  value for the message.
 *
 * Return Value:
 *  BOOL            TRUE to prevent further processing,
 *                  FALSE otherwise.
 */

BOOL CCosmoDoc::FMessageHook(HWND hWnd, UINT iMsg, WPARAM wParam
    , LPARAM lParam, LRESULT *pLRes)
    {
    UINT        dx, dy;
    RECT        rc;

    *pLRes=0;

    if (WM_SIZE==iMsg)
        {
        //Don't effect the Polyline size to or from minimized state.
        if (SIZE_MINIMIZED!=wParam && SIZE_MINIMIZED !=m_uPrevSize)
            {
            //When we change size, resize any Polyline we hold.
            dx=LOWORD(lParam);
            dy=HIWORD(lParam);

            /*
             * If we are getting WM_SIZE in response to a Polyline
             * notification, then don't resize the Polyline window
             * again.
             */
            if (!m_fNoSize && NULL!=m_pPL)
                {
                //Resize the polyline to fit the new client
                SetRect(&rc, 8, 8, dx-8, dy-8);
                m_pPL->RectSet(&rc, FALSE);

                /*
                 * We consider sizing something that makes the file
                 * dirty, but not until we've finished the create
                 * process, which is why we set fNoDirty to FALSE
                 * in WM_CREATE since we get a WM_SIZE on the first
                 * creation.
                 */
                if (!m_fNoDirty)
                    FDirtySet(TRUE);

                SetRect(&rc, 0, 0, dx, dy);

                if (NULL!=m_pAdv)
                    m_pAdv->OnSizeChange(this, &rc);

                m_fNoDirty=FALSE;
                }
            }

        m_uPrevSize=wParam;
        }

    if (WM_LBUTTONDOWN==iMsg)
        {
        LPDROPSOURCE    pIDropSource;
        LPDATAOBJECT    pIDataObject;
        HRESULT         hr;
        SCODE           sc;
        DWORD           dwEffect;

        /*
         * The document has an 8 pixel border around the polyline
         * window where we'll see mouse clicks.  A left mouse button
         * click here means the start of a drag-drop operation.
         *
         * Since this is a modal operation, this IDropSource
         * is entirely local.
         */

        pIDropSource=new CDropSource(this);

        if (NULL==pIDropSource)
            return FALSE;

        pIDropSource->AddRef();
        m_fDragSource=TRUE;

        //Go get the data and start the ball rolling.
        pIDataObject=TransferObjectCreate(FALSE);

        if (NULL!=pIDataObject)
            {
            hr=DoDragDrop(pIDataObject, pIDropSource
                , DROPEFFECT_COPY | DROPEFFECT_MOVE | DROPEFFECT_LINK
                , &dwEffect);

            pIDataObject->Release();
            sc=GetScode(hr);
            }
        else
            sc=E_FAIL;

        /*
         * When we return from DoDragDrop, either cancel or drop.
         * First toss the IDropSource we have here, then bail out
         * on cancel, and possibly clear our data on a move drop.
         */

        pIDropSource->Release();

        /*
         * If dropped on the same document (determined using
         * this flag, then dwEffect will be DROPEFFECT_NONE (see
         * IDropTarget::Drop in DROPTGT.CPP).  In any case,
         * reset this since the operation is done.
         */

        m_fDragSource=FALSE;

        if (DRAGDROP_S_DROP==sc && DROPEFFECT_MOVE==dwEffect)
            {
            m_pPL->New();
            FDirtySet(TRUE);
            }

        //On a canceled drop or a copy we don't do anything else
        return TRUE;
        }

    if (WM_DESTROY==iMsg)
        {
        /*
         * We have to revoke the drop target here because the window
         * will be destroyed and the property forcefully removed
         * before we could do this in the destructor.
         */
        if (NULL!=m_pDropTarget)
            {
            RevokeDragDrop(m_hWnd);
            CoLockObjectExternal(m_pDropTarget, FALSE, TRUE);
            ReleaseInterface(m_pDropTarget);
            }

        return FALSE;
        }


    /*
     * We return FALSE even on WM_SIZE so we can let the default
     * procedure handle maximized MDI child windows appropriately.
     */
    return FALSE;
    }








/*
 * CCosmoDoc::Clear
 *
 * Purpose:
 *  Sets all contents in the document back to defaults with
 *  no filename.
 *
 * Paramters:
 *  None
 *
 * Return Value:
 *  None
 */

void CCosmoDoc::Clear(void)
    {
    //Completely reset the polyline
    m_pPL->New();

    CDocument::Clear();
    m_lVer=0;
    return;
    }



/*
 * CCosmoDoc::FDirtySet
 *
 * Purpose:
 *  Sets or clears the document 'dirty' flag returning the previous
 *  state of that same flag.  We override this in Cosmo server to
 *  send the OnDataChange notification as necessary.
 *
 * Parameters:
 *  fDirty          BOOL indicating the new contents of the dirty
 *                  flag.
 *
 * Return Value:
 *  BOOL            Previous value of the dirty flag.
 */

BOOL CCosmoDoc::FDirtySet(BOOL fDirty)
    {
    BOOL        fRet;

    fRet=CDocument::FDirtySet(fDirty);
    m_pFigure->SendAdvise(OBJECTCODE_DATACHANGED);

    return fRet;
    }




/*
 * CCosmoDoc::FDirtyGet
 *
 * Purpose:
 *  Override of the normal FDirtyGet such that we never return dirty
 *  for an embedded object we're serving since updates constantly
 *  happen and since the object will be saved on closure.  This then
 *  prevents any message boxes asking the user to save.
 *
 * Parameters:
 *  None
 *
 * Return Value:
 *  BOOL            TRUE if the document is dirty, FALSE otherwise.
 */

BOOL CCosmoDoc::FDirtyGet(void)
    {
    if (m_pFigure->FIsEmbedded())
        return FALSE;

    return m_fDirty;
    }



/*
 * CCosmoDoc::Load
 *
 * Purpose:
 *  Loads a given document without any user interface overwriting
 *  the previous contents of the Polyline window.  We do this by
 *  opening the file and telling the Polyline to load itself from
 *  that file.
 *
 * Parameters:
 *  fChangeFile     BOOL indicating if we're to update the window
 *                  title and the filename from using this file.
 *  pszFile         LPTSTR to the filename to load, NULL if the file
 *                  is new and untitled.
 *
 * Return Value:
 *  UINT            An error value from DOCERR_*
 */

UINT CCosmoDoc::Load(BOOL fChangeFile, LPTSTR pszFile)
    {
    HRESULT         hr;
    LPSTORAGE       pIStorage;

    if (NULL==pszFile)
        {
        //For a new untitled document, just rename ourselves.
        Rename(NULL);
        m_lVer=VERSIONCURRENT;
        return DOCERR_NONE;
        }

    /*
     * If not a Compound File, open the file using STGM_CONVERT in
     * transacted mode to see old files as a storage with one stream
     * called "CONTENTS" (which is conveniently the name we use
     * in the new files).  We must use STGM_TRANSACTED here or else
     * the old file will be immediately converted on disk:  we only
     * want a converted image in memory from which to read.  In
     * addition, note that we need STGM_READWRITE as well since
     * conversion is inherently a write operation.
     */

    pIStorage=NULL;

    if (NOERROR!=StgIsStorageFile(pszFile))
        {
        hr=StgCreateDocfile(pszFile,STGM_TRANSACTED | STGM_READWRITE
            | STGM_CONVERT | STGM_SHARE_EXCLUSIVE, 0, &pIStorage);

        if (FAILED(hr))
            {
            //If denied write access, try to load the old way
            if (STG_E_ACCESSDENIED==GetScode(hr))
                m_lVer=m_pPL->ReadFromFile(pszFile);
            else
                return DOCERR_COULDNOTOPEN;
            }
        }
    else
        {
        hr=StgOpenStorage(pszFile, NULL, STGM_DIRECT | STGM_READ
            | STGM_SHARE_EXCLUSIVE, NULL, 0, &pIStorage);

        if (FAILED(hr))
            return DOCERR_COULDNOTOPEN;
        }

    if (NULL!=pIStorage)
        {
        m_lVer=m_pPL->ReadFromStorage(pIStorage);
        pIStorage->Release();
        }

    if (POLYLINE_E_READFAILURE==m_lVer)
        return DOCERR_READFAILURE;

    if (POLYLINE_E_UNSUPPORTEDVERSION==m_lVer)
        return DOCERR_UNSUPPORTEDVERSION;

    if (fChangeFile)
        Rename(pszFile);

    //Importing a file makes things dirty
    FDirtySet(!fChangeFile);

    return DOCERR_NONE;
    }