polyline.cpp

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/*
 * POLYLINE.CPP
 * Cosmo Chapter 23
 *
 * Implementation of the CPolyline class.
 *
 * Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved
 *
 * Kraig Brockschmidt, Microsoft
 * Internet  :  [e-mail]
 * Compuserve:  >INTERNET:[e-mail]
 */


#include "cosmo.h"


/*
 * CPolyline:CPolyline
 * CPolyline::~CPolyline
 *
 * Constructor Parameters:
 *  hInst           HINSTANCE of the application we're in.
 */

CPolyline::CPolyline(HINSTANCE hInst)
    : CWindow(hInst)
    {
    m_pAdv=NULL;
    m_hWnd=NULL;
    m_fReadFromOLE10=FALSE;
    return;
    }


CPolyline::~CPolyline(void)
    {
    return;
    }





/*
 * CPolyline::Init
 *
 * Purpose:
 *  Instantiates a polyline window within a given parent.  The
 *  parent may be a main application window, could be an MDI child
 *  window. We really do not care.
 *
 * Parameters:
 *  hWndParent      HWND of the parent of this window
 *  pRect           LPRECT that this window should occupy
 *  dwStyle         DWORD containing the window's style flags
 *  uID             UINT ID to associate with this window
 *  pAdv            PCPolylineAdviseSink of the sink wanting our
 *                  notifications.
 *
 * Return Value:
 *  BOOL            TRUE if the function succeeded, FALSE otherwise.
 */

BOOL CPolyline::Init(HWND hWndParent, LPRECT pRect, DWORD dwStyle
    , UINT uID, PCPolylineAdviseSink pAdv)
    {
    m_hWnd=CreateWindowEx(WS_EX_NOPARENTNOTIFY, SZCLASSPOLYLINE
        , SZCLASSPOLYLINE, dwStyle, pRect->left, pRect->top
        , pRect->right-pRect->left, pRect->bottom-pRect->top
        , hWndParent, (HMENU)uID, m_hInst, this);

    if (NULL!=m_hWnd)
        m_pAdv=pAdv;

    return (NULL!=m_hWnd);
    }







/*
 * CPolyline::New
 *
 * Purpose:
 *  Cleans out and reinitializes the data to defaults.
 *
 * Parameters:
 *  None
 *
 * Return Value:
 *  None
 */

void CPolyline::New(void)
    {
    UINT        i;
    RECT        rc;

    m_pl.wVerMaj=VERSIONMAJOR;
    m_pl.wVerMin=VERSIONMINOR;

    //Our rectangle is the size of our window's client area.
    GetClientRect(m_hWnd, &rc);
    RECTTORECTS(rc, m_pl.rc);

    //Clean out the POLYLINE structure and repaint the window.
    for (i=0; i< CPOLYLINEPOINTS; i++)
        {
        m_pl.rgpt[i].x=0;
        m_pl.rgpt[i].y=0;
        }

    m_pl.cPoints      =0;
    m_pl.rgbBackground=GetSysColor(COLOR_WINDOW);
    m_pl.rgbLine      =GetSysColor(COLOR_WINDOWTEXT);
    m_pl.iLineStyle   =PS_SOLID;

    InvalidateRect(m_hWnd, NULL, TRUE);
    UpdateWindow(m_hWnd);

    //Inform the advise sink of this data change.
    if (NULL!=m_pAdv)
        m_pAdv->OnDataChange();

    return;
    }




/*
 * CPolyline::Undo
 *
 * Purpose:
 *  Reverses previous actions in a Polyline.
 *
 * Parameters:
 *  None
 *
 * Return Value:
 *  BOOL            TRUE if we can Undo more, FALSE otherwise.
 */

BOOL CPolyline::Undo(void)
    {
    //Decrement the number of active points and repaint.
    if (m_pl.cPoints > 0)
        {
        m_pl.cPoints--;
        InvalidateRect(m_hWnd, NULL, TRUE);
        UpdateWindow(m_hWnd);
        }

    if (NULL!=m_pAdv)
        m_pAdv->OnPointChange();

    //Return if we can undo any more.
    return (0!=m_pl.cPoints);
    }





/*
 * CPolyline::ReadFromStorage
 *
 * Purpose:
 *  Loads our data (any known version) from an IStorage returning
 *  the version number of the data or an error value.
 *
 * Parameters:
 *  pIStorage       LPSTORAGE from which we'll read.
 *
 * Return Value:
 *  LONG            Version number or negative POLYLINE_E_* value.
 */

LONG CPolyline::ReadFromStorage(LPSTORAGE pIStorage)
    {
    LONG            lRet;
    LPSTREAM        pIStream;
    HRESULT         hr;

    if (NULL==pIStorage)
        return POLYLINE_E_READFAILURE;

    //Open the CONTENTS stream
    hr=pIStorage->OpenStream(SZSTREAM, 0, STGM_DIRECT | STGM_READ
        | STGM_SHARE_EXCLUSIVE, 0, &pIStream);

    if (FAILED(hr))
        return POLYLINE_E_READFAILURE;

    /*
     * Since we had to create ReadFromStream for IPersistStorage,
     * use it ourselves.
     */
    lRet=ReadFromStream(pIStream);
    pIStream->Release();

    return lRet;
    }




/*
 * CPolyline::WriteToStorage
 *
 * Purpose:
 *  Ignorantly writes our current data into a storage in a
 *  particular version.
 *
 * Parameters:
 *  pIStorage       LPSTORAGE in which to save.
 *  lVer            LONG providing version number Major (HI) and
 *                  Minor (Low)
 *
 * Return Value:
 *  LONG            A POLYLINE_E_* value.
 */

LONG CPolyline::WriteToStorage(LPSTORAGE pIStorage, LONG lVer)
    {
    LONG            lRet;
    LPSTREAM        pIStream;
    HRESULT         hr;

    if (NULL==pIStorage)
        return POLYLINE_E_READFAILURE;

    hr=pIStorage->CreateStream(SZSTREAM, STGM_DIRECT | STGM_CREATE
        | STGM_WRITE | STGM_SHARE_EXCLUSIVE, 0, 0, &pIStream);

    if (FAILED(hr))
        return POLYLINE_E_WRITEFAILURE;

    /*
     * Use our function that will save to a stream now that
     * we needed it for IPersistStorage.
     */

    lRet=WriteToStream(pIStream, lVer);
    pIStream->Release();

    return lRet;
    }




/*
 * CPolyline::ReadFromStream
 *
 * Purpose:
 *  Loads our data (any known version) from an IStream that we
 *  do not open nor maintain.  This is for the compound document
 *  object's implementation of IPersistStorage.
 *
 * Parameters:
 *  pIStream        LPSTREAM from which we'll read.
 *
 * Return Value:
 *  LONG            Version number or negative POLYLINE_E_* value.
 */

LONG CPolyline::ReadFromStream(LPSTREAM pIStream)
    {
    POLYLINEDATA    pl;
    ULONG           cb=(ULONG)-1;
    ULONG           cbExpect=0;
    HRESULT         hr;
    LARGE_INTEGER   li;

    if (NULL==pIStream)
        return POLYLINE_E_READFAILURE;

    /*
     * If IPersistStorage::Load failed to find CONTENTS but did
     * open "\1Ole10Native" then m_fReadFromOLE10 is set.  So
     * we have to start reading past the leading DWORD.
     */

    if (m_fReadFromOLE10)
        {
        DWORD       dw;

        /*
         * Skip the DWORD length at the beginning of the
         * Ole10Native stream.
         */
        pIStream->Read(&dw, sizeof(DWORD), &cb);
        }


    //Read version numbers and seek back to file beginning.
    hr=pIStream->Read(&pl, 2*sizeof(WORD), &cb);

    //If we read OLE 1, seek back but skip the size header.
    LISet32(li, m_fReadFromOLE10 ? sizeof(DWORD) : 0);
    pIStream->Seek(li, STREAM_SEEK_SET, NULL);

    if (FAILED(hr) || 2*sizeof(WORD)!=cb)
        {
        pIStream->Release();
        return POLYLINE_E_READFAILURE;
        }

    /*
     * For version 2.0, read the entire file.  For version 1.0 read
     * the file up to CBPOLYLINEDATAVER10.  For anything else, give
     * an error.
     */

    switch (pl.wVerMaj)
        {
        case VERSIONMAJOR:  //2.x
            switch (pl.wVerMin)
                {
                case VERSIONMINOR:  //2.0
                    cbExpect=CBPOLYLINEDATA;
                    break;

                default:
                    break;
                }
            break;

        case 1: //1.x
            switch (pl.wVerMin)
                {
                case 0:  //1.0
                    cbExpect=CBPOLYLINEDATA10;
                    break;

                default:
                    break;
                }
            break;

        default:
            break;
        }

    if (0==cbExpect)
        return POLYLINE_E_UNSUPPORTEDVERSION;

    hr=pIStream->Read(&pl, cbExpect, &cb);

    if (cbExpect!=cb)
        return POLYLINE_E_READFAILURE;

    /*
     * If we loaded successfully, make the data current.  By using
     * DataSet we centralize our version upgrading.  We size the
     * polyline window to the data AND notify the document so it
     * sizes to the polyline.
     */
    DataSet(&pl, TRUE, TRUE);

    //Return what version we just loaded.
    return MAKELONG(pl.wVerMin, pl.wVerMaj);
    }




/*
 * CPolyline::WriteToStream
 *
 * Purpose:
 *  Ignorantly writes our current data into a stream in a
 *  particular version.
 *
 * Parameters:
 *  pIStream        LPSTREAM in which to save.
 *  lVer            LONG providing version number Major (HI) and
 *                  Minor (Low)
 *
 * Return Value:
 *  LONG            A POLYLINE_E_* value.
 */

LONG CPolyline::WriteToStream(LPSTREAM pIStream, LONG lVer)
    {
    ULONG           cb;
    ULONG           cbExpect=0;
    WORD            wVerMaj=HIWORD(lVer);
    WORD            wVerMin=LOWORD(lVer);
    POLYLINEDATA    pl;
    HRESULT         hr;

    if (NULL==pIStream)
        return POLYLINE_E_READFAILURE;

    //Get a copy of our data in the version we're going to save.
    DataGet(&pl, lVer);

    switch (wVerMaj)
        {
        case VERSIONMAJOR:  //2.x
            switch (wVerMin)
                {
                case VERSIONMINOR:  //2.0
                    cbExpect=CBPOLYLINEDATA;
                    break;

                default:
                    break;
                }
            break;

        case 1: //1.x
            switch (wVerMin)
                {
                case 0:  //1.0
                    cbExpect=CBPOLYLINEDATA10;
                    break;

                default:
                    break;
                }
            break;

        default:
            break;
        }

    if (0==cbExpect)
        return POLYLINE_E_UNSUPPORTEDVERSION;

    /*
     * If writing to an OLE 1 storage, include the length of
     * data as the first DWORD in the stream.
     */

     if (m_fReadFromOLE10 && CBPOLYLINEDATA10==cbExpect)
        {
        hr=pIStream->Write(&cbExpect, sizeof(DWORD), &cb);

        if (FAILED(hr) || sizeof(DWORD)!=cb)
            return POLYLINE_E_WRITEFAILURE;
        }

    hr=pIStream->Write(&pl, cbExpect, &cb);

    if (FAILED(hr) || cbExpect!=cb)
        return POLYLINE_E_WRITEFAILURE;

    return POLYLINE_E_NONE;
    }







/*
 * CPolyline::ReadFromFile
 *
 * Purpose:
 *  Loads our data (any known version) from a file handle returning
 *  the version number of the data or an error value.
 *
 * Parameters:
 *  pszFile         LPTSTR of the file to open.
 *
 * Return Value:
 *  LONG            Version number or negative POLYLINE_E_* value.
 */

LONG CPolyline::ReadFromFile(LPTSTR pszFile)
    {
    OFSTRUCT        of;
    HFILE           hFile;
    POLYLINEDATA    pl;
    UINT            cb=(UINT)-1;
    UINT            cbExpect=0;

    if (NULL==pszFile)
        return POLYLINE_E_READFAILURE;

    //OpenFileW is a member of CPolyline.
    hFile=OpenFileW(pszFile, &of, OF_READ);

    if (HFILE_ERROR==hFile)
        return POLYLINE_E_READFAILURE;

    //Read version numbers and seek back to file beginning.
    cb=_lread(hFile, &pl, 2*sizeof(WORD));
    _llseek(hFile, 0L, 0);

    if (2*sizeof(WORD)!=cb)
        {
        _lclose(hFile);
        return POLYLINE_E_READFAILURE;
        }