src/msw/ole/dataobj.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/ole/dataobj.cpp
   3 // Purpose:     implementation of wx[I]DataObject class
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     10.05.98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21   #pragma implementation "dataobj.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #if defined(__BORLANDC__)
  28   #pragma hdrstop
  29 #endif
  30 #ifndef WX_PRECOMP
  31 #include "wx/intl.h"
  32 #endif
  33 #include "wx/defs.h"
  34
  35 #if defined(__WIN32__) && !defined(__GNUWIN32__) || defined(wxUSE_NORLANDER_HEADERS)
  36
  37 #include "wx/log.h"
  38 #include "wx/dataobj.h"
  39
  40 #include <windows.h>
  41 #ifdef wxUSE_NORLANDER_HEADERS
  42   #include <ole2.h>
  43 #endif
  44 #include <oleauto.h>
  45
  46 #ifndef __WIN32__
  47   #include <ole2.h>
  48   #include <olestd.h>
  49 #endif
  50
  51 #include <shlobj.h>
  52
  53 #include  "wx/msw/ole/oleutils.h"
  54
  55 // ----------------------------------------------------------------------------
  56 // functions
  57 // ----------------------------------------------------------------------------
  58
  59 #ifdef __WXDEBUG__
  60     static const wxChar *GetTymedName(DWORD tymed);
  61 #else // !Debug
  62     #define GetTymedName(tymed) ""
  63 #endif // Debug/!Debug
  64
  65 // to be moved into wx/msw/bitmap.h
  66 extern size_t wxConvertBitmapToDIB(BITMAPINFO *pbi, const wxBitmap& bitmap);
  67 extern wxBitmap wxConvertDIBToBitmap(const BITMAPINFO *bmi);
  68
  69 // ----------------------------------------------------------------------------
  70 // wxIEnumFORMATETC interface implementation
  71 // ----------------------------------------------------------------------------
  72
  73 class wxIEnumFORMATETC : public IEnumFORMATETC
  74 {
  75 public:
  76     wxIEnumFORMATETC(const wxDataFormat* formats, ULONG nCount);
  77     ~wxIEnumFORMATETC() { delete [] m_formats; }
  78
  79     DECLARE_IUNKNOWN_METHODS;
  80
  81     // IEnumFORMATETC
  82     STDMETHODIMP Next(ULONG celt, FORMATETC *rgelt, ULONG *pceltFetched);
  83     STDMETHODIMP Skip(ULONG celt);
  84     STDMETHODIMP Reset();
  85     STDMETHODIMP Clone(IEnumFORMATETC **ppenum);
  86
  87 private:
  88     CLIPFORMAT *m_formats;  // formats we can provide data in
  89     ULONG       m_nCount,   // number of formats we support
  90                 m_nCurrent; // current enum position
  91 };
  92
  93 // ----------------------------------------------------------------------------
  94 // wxIDataObject implementation of IDataObject interface
  95 // ----------------------------------------------------------------------------
  96
  97 class wxIDataObject : public IDataObject
  98 {
  99 public:
 100     wxIDataObject(wxDataObject *pDataObject);
 101     ~wxIDataObject();
 102
 103     // normally, wxDataObject controls our lifetime (i.e. we're deleted when it
 104     // is), but in some cases, the situation is inversed, that is we delete it
 105     // when this object is deleted - setting this flag enables such logic
 106     void SetDeleteFlag() { m_mustDelete = TRUE; }
 107
 108     DECLARE_IUNKNOWN_METHODS;
 109
 110     // IDataObject
 111     STDMETHODIMP GetData(FORMATETC *pformatetcIn, STGMEDIUM *pmedium);
 112     STDMETHODIMP GetDataHere(FORMATETC *pformatetc, STGMEDIUM *pmedium);
 113     STDMETHODIMP QueryGetData(FORMATETC *pformatetc);
 114     STDMETHODIMP GetCanonicalFormatEtc(FORMATETC *In, FORMATETC *pOut);
 115     STDMETHODIMP SetData(FORMATETC *pfetc, STGMEDIUM *pmedium, BOOL fRelease);
 116     STDMETHODIMP EnumFormatEtc(DWORD dwDirection, IEnumFORMATETC **ppenumFEtc);
 117     STDMETHODIMP DAdvise(FORMATETC *pfetc, DWORD ad, IAdviseSink *p, DWORD *pdw);
 118     STDMETHODIMP DUnadvise(DWORD dwConnection);
 119     STDMETHODIMP EnumDAdvise(IEnumSTATDATA **ppenumAdvise);
 120
 121 private:
 122     wxDataObject *m_pDataObject;      // pointer to C++ class we belong to
 123
 124     bool m_mustDelete;
 125 };
 126
 127 // ----------------------------------------------------------------------------
 128 // small helper class for getting screen DC (we're working with bitmaps and
 129 // DIBs here)
 130 // ----------------------------------------------------------------------------
 131
 132 class ScreenHDC
 133 {
 134 public:
 135     ScreenHDC() { m_hdc = GetDC(NULL);    }
 136    ~ScreenHDC() { ReleaseDC(NULL, m_hdc); }
 137     operator HDC() const { return m_hdc;  }
 138
 139 private:
 140     HDC m_hdc;
 141 };
 142
 143 // ============================================================================
 144 // implementation
 145 // ============================================================================
 146
 147 // ----------------------------------------------------------------------------
 148 // wxDataFormat
 149 // ----------------------------------------------------------------------------
 150
 151 void wxDataFormat::SetId(const wxChar *format)
 152 {
 153     m_format = ::RegisterClipboardFormat(format);
 154     if ( !m_format )
 155     {
 156         wxLogError(_("Couldn't register clipboard format '%s'."), format);
 157     }
 158 }
 159
 160 wxString wxDataFormat::GetId() const
 161 {
 162     static const int max = 256;
 163
 164     wxString s;
 165
 166     wxCHECK_MSG( !IsStandard(), s,
 167                  wxT("name of predefined format cannot be retrieved") );
 168
 169     int len = ::GetClipboardFormatName(m_format, s.GetWriteBuf(max), max);
 170     s.UngetWriteBuf();
 171
 172     if ( !len )
 173     {
 174         wxLogError(_("The clipboard format '%d' doesn't exist."), m_format);
 175     }
 176
 177     return s;
 178 }
 179
 180 // ----------------------------------------------------------------------------
 181 // wxIEnumFORMATETC
 182 // ----------------------------------------------------------------------------
 183
 184 BEGIN_IID_TABLE(wxIEnumFORMATETC)
 185     ADD_IID(Unknown)
 186     ADD_IID(EnumFORMATETC)
 187 END_IID_TABLE;
 188
 189 IMPLEMENT_IUNKNOWN_METHODS(wxIEnumFORMATETC)
 190
 191 wxIEnumFORMATETC::wxIEnumFORMATETC(const wxDataFormat *formats, ULONG nCount)
 192 {
 193     m_cRef = 0;
 194     m_nCurrent = 0;
 195     m_nCount = nCount;
 196     m_formats = new CLIPFORMAT[nCount];
 197     for ( ULONG n = 0; n < nCount; n++ ) {
 198         m_formats[n] = formats[n].GetFormatId();
 199     }
 200 }
 201
 202 STDMETHODIMP wxIEnumFORMATETC::Next(ULONG      celt,
 203                                     FORMATETC *rgelt,
 204                                     ULONG     *pceltFetched)
 205 {
 206     wxLogTrace(wxTRACE_OleCalls, wxT("wxIEnumFORMATETC::Next"));
 207
 208     if ( celt > 1 ) {
 209         // we only return 1 element at a time - mainly because I'm too lazy to
 210         // implement something which you're never asked for anyhow
 211         return S_FALSE;
 212     }
 213
 214     if ( m_nCurrent < m_nCount ) {
 215         FORMATETC format;
 216         format.cfFormat = m_formats[m_nCurrent++];
 217         format.ptd      = NULL;
 218         format.dwAspect = DVASPECT_CONTENT;
 219         format.lindex   = -1;
 220         format.tymed    = TYMED_HGLOBAL;
 221         *rgelt = format;
 222
 223         return S_OK;
 224     }
 225     else {
 226         // bad index
 227         return S_FALSE;
 228     }
 229 }
 230
 231 STDMETHODIMP wxIEnumFORMATETC::Skip(ULONG celt)
 232 {
 233     wxLogTrace(wxTRACE_OleCalls, wxT("wxIEnumFORMATETC::Skip"));
 234
 235     m_nCurrent += celt;
 236     if ( m_nCurrent < m_nCount )
 237         return S_OK;
 238
 239     // no, can't skip this many elements
 240     m_nCurrent -= celt;
 241
 242     return S_FALSE;
 243 }
 244
 245 STDMETHODIMP wxIEnumFORMATETC::Reset()
 246 {
 247     wxLogTrace(wxTRACE_OleCalls, wxT("wxIEnumFORMATETC::Reset"));
 248
 249     m_nCurrent = 0;
 250
 251     return S_OK;
 252 }
 253
 254 STDMETHODIMP wxIEnumFORMATETC::Clone(IEnumFORMATETC **ppenum)
 255 {
 256     wxLogTrace(wxTRACE_OleCalls, wxT("wxIEnumFORMATETC::Clone"));
 257
 258     // unfortunately, we can't reuse the code in ctor - types are different
 259     wxIEnumFORMATETC *pNew = new wxIEnumFORMATETC(NULL, 0);
 260     pNew->m_nCount = m_nCount;
 261     pNew->m_formats = new CLIPFORMAT[m_nCount];
 262     for ( ULONG n = 0; n < m_nCount; n++ ) {
 263         pNew->m_formats[n] = m_formats[n];
 264     }
 265     pNew->AddRef();
 266     *ppenum = pNew;
 267
 268     return S_OK;
 269 }
 270
 271 // ----------------------------------------------------------------------------
 272 // wxIDataObject
 273 // ----------------------------------------------------------------------------
 274
 275 BEGIN_IID_TABLE(wxIDataObject)
 276     ADD_IID(Unknown)
 277     ADD_IID(DataObject)
 278 END_IID_TABLE;
 279
 280 IMPLEMENT_IUNKNOWN_METHODS(wxIDataObject)
 281
 282 wxIDataObject::wxIDataObject(wxDataObject *pDataObject)
 283 {
 284     m_cRef = 0;
 285     m_pDataObject = pDataObject;
 286     m_mustDelete = FALSE;
 287 }
 288
 289 wxIDataObject::~wxIDataObject()
 290 {
 291     if ( m_mustDelete )
 292     {
 293         delete m_pDataObject;
 294     }
 295 }
 296
 297 // get data functions
 298 STDMETHODIMP wxIDataObject::GetData(FORMATETC *pformatetcIn, STGMEDIUM *pmedium)
 299 {
 300     wxLogTrace(wxTRACE_OleCalls, wxT("wxIDataObject::GetData"));
 301
 302     // is data is in our format?
 303     HRESULT hr = QueryGetData(pformatetcIn);
 304     if ( FAILED(hr) )
 305         return hr;
 306
 307     // for the bitmaps and metafiles we use the handles instead of global memory
 308     // to pass the data
 309     wxDataFormat format = (wxDataFormatId)pformatetcIn->cfFormat;
 310
 311     switch ( format )
 312     {
 313         case wxDF_BITMAP:
 314             pmedium->tymed = TYMED_GDI;
 315             break;
 316
 317         case wxDF_METAFILE:
 318             pmedium->tymed = TYMED_MFPICT;
 319             break;
 320
 321         default:
 322             // alloc memory
 323             size_t size = m_pDataObject->GetDataSize(format);
 324             if ( !size ) {
 325                 // it probably means that the method is just not implemented
 326                 wxLogDebug(wxT("Invalid data size - can't be 0"));
 327
 328                 return DV_E_FORMATETC;
 329             }
 330
 331             if ( !format.IsStandard() ) {
 332                 // for custom formats, put the size with the data - alloc the
 333                 // space for it
 334                 size += sizeof(size_t);
 335             }
 336
 337             HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE | GMEM_SHARE, size);
 338             if ( hGlobal == NULL ) {
 339                 wxLogLastError("GlobalAlloc");
 340                 return E_OUTOFMEMORY;
 341             }
 342
 343             // copy data
 344             pmedium->tymed   = TYMED_HGLOBAL;
 345             pmedium->hGlobal = hGlobal;
 346     }
 347
 348     pmedium->pUnkForRelease = NULL;
 349
 350     // do copy the data
 351     hr = GetDataHere(pformatetcIn, pmedium);
 352     if ( FAILED(hr) ) {
 353         // free resources we allocated
 354         if ( pmedium->tymed == TYMED_HGLOBAL ) {
 355             GlobalFree(pmedium->hGlobal);
 356         }
 357
 358         return hr;
 359     }
 360
 361     return S_OK;
 362 }
 363
 364 STDMETHODIMP wxIDataObject::GetDataHere(FORMATETC *pformatetc,
 365                                         STGMEDIUM *pmedium)
 366 {
 367     wxLogTrace(wxTRACE_OleCalls, wxT("wxIDataObject::GetDataHere"));
 368
 369     // put data in caller provided medium
 370     switch ( pmedium->tymed )
 371     {
 372         case TYMED_GDI:
 373             if ( !m_pDataObject->GetDataHere(wxDF_BITMAP, &pmedium->hBitmap) )
 374                 return E_UNEXPECTED;
 375             break;
 376
 377         case TYMED_MFPICT:
 378             // this should be copied on bitmaps - but I don't have time for
 379             // this now
 380             wxFAIL_MSG(wxT("TODO - no support for metafiles in wxDataObject"));
 381             break;
 382
 383         case TYMED_HGLOBAL:
 384             {
 385                 // copy data
 386                 HGLOBAL hGlobal = pmedium->hGlobal;
 387                 void *pBuf = GlobalLock(hGlobal);
 388                 if ( pBuf == NULL ) {
 389                     wxLogLastError(wxT("GlobalLock"));
 390                     return E_OUTOFMEMORY;
 391                 }
 392
 393                 if ( !wxDataFormat(pformatetc->cfFormat).IsStandard() ) {
 394                     // for custom formats, put the size with the data
 395                     size_t *p = (size_t *)pBuf;
 396                     *p++ = GlobalSize(hGlobal);
 397                     pBuf = p;
 398                 }
 399
 400                 wxDataFormat format = pformatetc->cfFormat;
 401                 if ( !m_pDataObject->GetDataHere(format, pBuf) )
 402                     return E_UNEXPECTED;
 403
 404                 GlobalUnlock(hGlobal);
 405             }
 406             break;
 407
 408         default:
 409             return DV_E_TYMED;
 410     }
 411
 412     return S_OK;
 413 }
 414
 415 // set data functions
 416 STDMETHODIMP wxIDataObject::SetData(FORMATETC *pformatetc,
 417                                     STGMEDIUM *pmedium,
 418                                     BOOL       fRelease)
 419 {
 420     wxLogTrace(wxTRACE_OleCalls, wxT("wxIDataObject::SetData"));
 421
 422     switch ( pmedium->tymed )
 423     {
 424         case TYMED_GDI:
 425             m_pDataObject->SetData(wxDF_BITMAP, 0, &pmedium->hBitmap);
 426             break;
 427
 428         case TYMED_MFPICT:
 429             // this should be copied on bitmaps - but I don't have time for
 430             // this now
 431             wxFAIL_MSG(wxT("TODO - no support for metafiles in wxDataObject"));
 432             break;
 433
 434         case TYMED_HGLOBAL:
 435             {
 436                 // copy data
 437                 void *pBuf = GlobalLock(pmedium->hGlobal);
 438                 if ( pBuf == NULL ) {
 439                     wxLogLastError("GlobalLock");
 440
 441                     return E_OUTOFMEMORY;
 442                 }
 443
 444                 // we've got a problem with SetData() here because the base
 445                 // class version requires the size parameter which we don't
 446                 // have anywhere in OLE data transfer - so we need to
 447                 // synthetise it for known formats and we suppose that all data
 448                 // in custom formats starts with a DWORD containing the size
 449                 size_t size;
 450                 switch ( pformatetc->cfFormat )
 451                 {
 452                     case CF_TEXT:
 453                     case CF_OEMTEXT:
 454                         size = strlen((const char *)pBuf);
 455                         break;
 456 #ifndef __WATCOMC__
 457                     case CF_UNICODETEXT:
 458                         size = wcslen((const wchar_t *)pBuf);
 459                         break;
 460 #endif
 461                     case CF_BITMAP:
 462                     case CF_HDROP:
 463                         // these formats don't use size at all, anyhow (but
 464                         // pass data by handle, which is always a single DWORD)
 465                         size = 0;
 466                         break;
 467
 468                     case CF_DIB:
 469                         // the handler will calculate size itself (it's too
 470                         // complicated to do it here)
 471                         size = 0;
 472                         break;
 473
 474                     default:
 475                         {
 476                             // we suppose that the size precedes the data
 477                             size_t *p = (size_t *)pBuf;
 478                             size = *p++;
 479                             pBuf = p;
 480                         }
 481                 }
 482
 483                 wxDataFormat format = pformatetc->cfFormat;
 484                 bool ok = m_pDataObject->SetData(format, size, pBuf);
 485
 486                 GlobalUnlock(pmedium->hGlobal);
 487
 488                 if ( !ok ) {
 489                     return E_UNEXPECTED;
 490                 }
 491             }
 492             break;
 493
 494         default:
 495             return DV_E_TYMED;
 496     }
 497
 498     if ( fRelease ) {
 499         // we own the medium, so we must release it - but do *not* free the
 500         // bitmap handle fi we have it because we have copied it elsewhere
 501         if ( pmedium->tymed == TYMED_GDI )
 502         {
 503             pmedium->hBitmap = 0;
 504         }
 505
 506         ReleaseStgMedium(pmedium);
 507     }
 508
 509     return S_OK;
 510 }
 511
 512 // information functions
 513 STDMETHODIMP wxIDataObject::QueryGetData(FORMATETC *pformatetc)
 514 {
 515     // do we accept data in this format?
 516     if ( pformatetc == NULL ) {
 517         wxLogTrace(wxTRACE_OleCalls,
 518                    wxT("wxIDataObject::QueryGetData: invalid ptr."));
 519
 520         return E_INVALIDARG;
 521     }
 522
 523     // the only one allowed by current COM implementation
 524     if ( pformatetc->lindex != -1 ) {
 525         wxLogTrace(wxTRACE_OleCalls,
 526                    wxT("wxIDataObject::QueryGetData: bad lindex %d"),
 527                    pformatetc->lindex);
 528
 529         return DV_E_LINDEX;
 530     }
 531
 532     // we don't support anything other (THUMBNAIL, ICON, DOCPRINT...)
 533     if ( pformatetc->dwAspect != DVASPECT_CONTENT ) {
 534         wxLogTrace(wxTRACE_OleCalls,
 535                    wxT("wxIDataObject::QueryGetData: bad dwAspect %d"),
 536                    pformatetc->dwAspect);
 537
 538         return DV_E_DVASPECT;
 539     }
 540
 541     // and now check the type of data requested
 542     wxDataFormat format = pformatetc->cfFormat;
 543     if ( m_pDataObject->IsSupportedFormat(format) ) {
 544         wxLogTrace(wxTRACE_OleCalls, wxT("wxIDataObject::QueryGetData: %s ok"),
 545                    wxGetFormatName(format));
 546     }
 547     else {
 548         wxLogTrace(wxTRACE_OleCalls,
 549                    wxT("wxIDataObject::QueryGetData: %s unsupported"),
 550                    wxGetFormatName(format));
 551
 552         return DV_E_FORMATETC;
 553     }
 554
 555     // we only transfer data by global memory, except for some particular cases
 556     DWORD tymed = pformatetc->tymed;
 557     if ( (format == wxDF_BITMAP && !(tymed & TYMED_GDI)) &&
 558          !(tymed & TYMED_HGLOBAL) ) {
 559         // it's not what we're waiting for
 560         wxLogTrace(wxTRACE_OleCalls,
 561                    wxT("wxIDataObject::QueryGetData: %s != %s"),
 562                    GetTymedName(tymed),
 563                    GetTymedName(format == wxDF_BITMAP ? TYMED_GDI
 564                                                       : TYMED_HGLOBAL));
 565
 566         return DV_E_TYMED;
 567     }
 568
 569     return S_OK;
 570 }
 571
 572 STDMETHODIMP wxIDataObject::GetCanonicalFormatEtc(FORMATETC *pFormatetcIn,
 573                                                   FORMATETC *pFormatetcOut)
 574 {
 575     wxLogTrace(wxTRACE_OleCalls, wxT("wxIDataObject::GetCanonicalFormatEtc"));
 576
 577     // TODO we might want something better than this trivial implementation here
 578     if ( pFormatetcOut != NULL )
 579         pFormatetcOut->ptd = NULL;
 580
 581     return DATA_S_SAMEFORMATETC;
 582 }
 583
 584 STDMETHODIMP wxIDataObject::EnumFormatEtc(DWORD dwDir,
 585                                           IEnumFORMATETC **ppenumFormatEtc)
 586 {
 587     wxLogTrace(wxTRACE_OleCalls, wxT("wxIDataObject::EnumFormatEtc"));
 588
 589     wxDataObject::Direction dir = dwDir == DATADIR_GET ? wxDataObject::Get
 590                                                        : wxDataObject::Set;
 591
 592     size_t nFormatCount = m_pDataObject->GetFormatCount(dir);
 593     wxDataFormat format, *formats;
 594     formats = nFormatCount == 1 ? &format : new wxDataFormat[nFormatCount];
 595     m_pDataObject->GetAllFormats(formats, dir);
 596
 597     wxIEnumFORMATETC *pEnum = new wxIEnumFORMATETC(formats, nFormatCount);
 598     pEnum->AddRef();
 599     *ppenumFormatEtc = pEnum;
 600
 601     if ( formats != &format ) {
 602         delete [] formats;
 603     }
 604
 605     return S_OK;
 606 }
 607
 608 // ----------------------------------------------------------------------------
 609 // advise sink functions (not implemented)
 610 // ----------------------------------------------------------------------------
 611
 612 STDMETHODIMP wxIDataObject::DAdvise(FORMATETC   *pformatetc,
 613                                     DWORD        advf,
 614                                     IAdviseSink *pAdvSink,
 615                                     DWORD       *pdwConnection)
 616 {
 617   return OLE_E_ADVISENOTSUPPORTED;
 618 }
 619
 620 STDMETHODIMP wxIDataObject::DUnadvise(DWORD dwConnection)
 621 {
 622   return OLE_E_ADVISENOTSUPPORTED;
 623 }
 624
 625 STDMETHODIMP wxIDataObject::EnumDAdvise(IEnumSTATDATA **ppenumAdvise)
 626 {
 627   return OLE_E_ADVISENOTSUPPORTED;
 628 }
 629
 630 // ----------------------------------------------------------------------------
 631 // wxDataObject
 632 // ----------------------------------------------------------------------------
 633
 634 wxDataObject::wxDataObject()
 635 {
 636     m_pIDataObject = new wxIDataObject(this);
 637     m_pIDataObject->AddRef();
 638 }
 639
 640 wxDataObject::~wxDataObject()
 641 {
 642     ReleaseInterface(m_pIDataObject);
 643 }
 644
 645 void wxDataObject::SetAutoDelete()
 646 {
 647     ((wxIDataObject *)m_pIDataObject)->SetDeleteFlag();
 648     m_pIDataObject->Release();
 649
 650     // so that the dtor doesnt' crash
 651     m_pIDataObject = NULL;
 652 }
 653
 654 bool wxDataObject::IsSupportedFormat(const wxDataFormat& format) const
 655 {
 656     size_t nFormatCount = GetFormatCount();
 657     if ( nFormatCount == 1 ) {
 658         return format == GetPreferredFormat();
 659     }
 660     else {
 661         wxDataFormat *formats = new wxDataFormat[nFormatCount];
 662         GetAllFormats(formats);
 663
 664         size_t n;
 665         for ( n = 0; n < nFormatCount; n++ ) {
 666             if ( formats[n] == format )
 667                 break;
 668         }
 669
 670         delete [] formats;
 671
 672         // found?
 673         return n < nFormatCount;
 674     }
 675 }
 676
 677 #ifdef __WXDEBUG__
 678
 679 const char *wxDataObject::GetFormatName(wxDataFormat format)
 680 {
 681   // case 'xxx' is not a valid value for switch of enum 'wxDataFormat'
 682   #ifdef __VISUALC__
 683     #pragma warning(disable:4063)
 684   #endif // VC++
 685
 686   static char s_szBuf[128];
 687   switch ( format ) {
 688     case CF_TEXT:         return "CF_TEXT";
 689     case CF_BITMAP:       return "CF_BITMAP";
 690     case CF_METAFILEPICT: return "CF_METAFILEPICT";
 691     case CF_SYLK:         return "CF_SYLK";
 692     case CF_DIF:          return "CF_DIF";
 693     case CF_TIFF:         return "CF_TIFF";
 694     case CF_OEMTEXT:      return "CF_OEMTEXT";
 695     case CF_DIB:          return "CF_DIB";
 696     case CF_PALETTE:      return "CF_PALETTE";
 697     case CF_PENDATA:      return "CF_PENDATA";
 698     case CF_RIFF:         return "CF_RIFF";
 699     case CF_WAVE:         return "CF_WAVE";
 700     case CF_UNICODETEXT:  return "CF_UNICODETEXT";
 701     case CF_ENHMETAFILE:  return "CF_ENHMETAFILE";
 702     case CF_HDROP:        return "CF_HDROP";
 703     case CF_LOCALE:       return "CF_LOCALE";
 704     default:
 705       sprintf(s_szBuf, "clipboard format 0x%x (unknown)", format);
 706       return s_szBuf;
 707   }
 708
 709   #ifdef __VISUALC__
 710     #pragma warning(default:4063)
 711   #endif // VC++
 712 }
 713
 714 #endif // Debug
 715
 716 // ----------------------------------------------------------------------------
 717 // wxBitmapDataObject supports CF_DIB format
 718 // ----------------------------------------------------------------------------
 719
 720 size_t wxBitmapDataObject::GetDataSize() const
 721 {
 722     return wxConvertBitmapToDIB(NULL, GetBitmap());
 723 }
 724
 725 bool wxBitmapDataObject::GetDataHere(void *buf) const
 726 {
 727     return wxConvertBitmapToDIB((BITMAPINFO *)buf, GetBitmap()) != 0;
 728 }
 729
 730 bool wxBitmapDataObject::SetData(size_t len, const void *buf)
 731 {
 732     wxBitmap bitmap(wxConvertDIBToBitmap((const BITMAPINFO *)buf));
 733
 734     if ( !bitmap.Ok() ) {
 735         wxFAIL_MSG(wxT("pasting/dropping invalid bitmap"));
 736
 737         return FALSE;
 738     }
 739
 740     SetBitmap(bitmap);
 741
 742     return TRUE;
 743 }
 744
 745 // ----------------------------------------------------------------------------
 746 // wxBitmapDataObject2 supports CF_BITMAP format
 747 // ----------------------------------------------------------------------------
 748
 749 // the bitmaps aren't passed by value as other types of data (i.e. by copying
 750 // the data into a global memory chunk and passing it to the clipboard or
 751 // another application or whatever), but by handle, so these generic functions
 752 // don't make much sense to them.
 753
 754 size_t wxBitmapDataObject2::GetDataSize() const
 755 {
 756     return 0;
 757 }
 758
 759 bool wxBitmapDataObject2::GetDataHere(void *pBuf) const
 760 {
 761     // we put a bitmap handle into pBuf
 762     *(WXHBITMAP *)pBuf = GetBitmap().GetHBITMAP();
 763
 764     return TRUE;
 765 }
 766
 767 bool wxBitmapDataObject2::SetData(size_t len, const void *pBuf)
 768 {
 769     HBITMAP hbmp = *(HBITMAP *)pBuf;
 770
 771     BITMAP bmp;
 772     if ( !GetObject(hbmp, sizeof(BITMAP), &bmp) )
 773     {
 774         wxLogLastError("GetObject(HBITMAP)");
 775     }
 776
 777     wxBitmap bitmap(bmp.bmWidth, bmp.bmHeight, bmp.bmPlanes);
 778     bitmap.SetHBITMAP((WXHBITMAP)hbmp);
 779
 780     if ( !bitmap.Ok() ) {
 781         wxFAIL_MSG(wxT("pasting/dropping invalid bitmap"));
 782
 783         return FALSE;
 784     }
 785
 786     SetBitmap(bitmap);
 787
 788     return TRUE;
 789 }
 790
 791 #if 0
 792
 793 size_t wxBitmapDataObject::GetDataSize(const wxDataFormat& format) const
 794 {
 795     if ( format.GetFormatId() == CF_DIB )
 796     {
 797         // create the DIB
 798         ScreenHDC hdc;
 799
 800         // shouldn't be selected into a DC or GetDIBits() would fail
 801         wxASSERT_MSG( !m_bitmap.GetSelectedInto(),
 802                       wxT("can't copy bitmap selected into wxMemoryDC") );
 803
 804         // first get the info
 805         BITMAPINFO bi;
 806         if ( !GetDIBits(hdc, (HBITMAP)m_bitmap.GetHBITMAP(), 0, 0,
 807                         NULL, &bi, DIB_RGB_COLORS) )
 808         {
 809             wxLogLastError("GetDIBits(NULL)");
 810
 811             return 0;
 812         }
 813
 814         return sizeof(BITMAPINFO) + bi.bmiHeader.biSizeImage;
 815     }
 816     else // CF_BITMAP
 817     {
 818         // no data to copy - we don't pass HBITMAP via global memory
 819         return 0;
 820     }
 821 }
 822
 823 bool wxBitmapDataObject::GetDataHere(const wxDataFormat& format,
 824                                      void *pBuf) const
 825 {
 826     wxASSERT_MSG( m_bitmap.Ok(), wxT("copying invalid bitmap") );
 827
 828     HBITMAP hbmp = (HBITMAP)m_bitmap.GetHBITMAP();
 829     if ( format.GetFormatId() == CF_DIB )
 830     {
 831         // create the DIB
 832         ScreenHDC hdc;
 833
 834         // shouldn't be selected into a DC or GetDIBits() would fail
 835         wxASSERT_MSG( !m_bitmap.GetSelectedInto(),
 836                       wxT("can't copy bitmap selected into wxMemoryDC") );
 837
 838         // first get the info
 839         BITMAPINFO *pbi = (BITMAPINFO *)pBuf;
 840         if ( !GetDIBits(hdc, hbmp, 0, 0, NULL, pbi, DIB_RGB_COLORS) )
 841         {
 842             wxLogLastError("GetDIBits(NULL)");
 843
 844             return 0;
 845         }
 846
 847         // and now copy the bits
 848         if ( !GetDIBits(hdc, hbmp, 0, pbi->bmiHeader.biHeight, pbi + 1,
 849                         pbi, DIB_RGB_COLORS) )
 850         {
 851             wxLogLastError("GetDIBits");
 852
 853             return FALSE;
 854         }
 855     }
 856     else // CF_BITMAP
 857     {
 858         // we put a bitmap handle into pBuf
 859         *(HBITMAP *)pBuf = hbmp;
 860     }
 861
 862     return TRUE;
 863 }
 864
 865 bool wxBitmapDataObject::SetData(const wxDataFormat& format,
 866                                  size_t size, const void *pBuf)
 867 {
 868     HBITMAP hbmp;
 869     if ( format.GetFormatId() == CF_DIB )
 870     {
 871         // here we get BITMAPINFO struct followed by the actual bitmap bits and
 872         // BITMAPINFO starts with BITMAPINFOHEADER followed by colour info
 873         ScreenHDC hdc;
 874
 875         BITMAPINFO *pbmi = (BITMAPINFO *)pBuf;
 876         BITMAPINFOHEADER *pbmih = &pbmi->bmiHeader;
 877         hbmp = CreateDIBitmap(hdc, pbmih, CBM_INIT,
 878                               pbmi + 1, pbmi, DIB_RGB_COLORS);
 879         if ( !hbmp )
 880         {
 881             wxLogLastError("CreateDIBitmap");
 882         }
 883
 884         m_bitmap.SetWidth(pbmih->biWidth);
 885         m_bitmap.SetHeight(pbmih->biHeight);
 886     }
 887     else // CF_BITMAP
 888     {
 889         // it's easy with bitmaps: we pass them by handle
 890         hbmp = *(HBITMAP *)pBuf;
 891
 892         BITMAP bmp;
 893         if ( !GetObject(hbmp, sizeof(BITMAP), &bmp) )
 894         {
 895             wxLogLastError("GetObject(HBITMAP)");
 896         }
 897
 898         m_bitmap.SetWidth(bmp.bmWidth);
 899         m_bitmap.SetHeight(bmp.bmHeight);
 900         m_bitmap.SetDepth(bmp.bmPlanes);
 901     }
 902
 903     m_bitmap.SetHBITMAP((WXHBITMAP)hbmp);
 904
 905     wxASSERT_MSG( m_bitmap.Ok(), wxT("pasting invalid bitmap") );
 906
 907     return TRUE;
 908 }
 909
 910 #endif // 0
 911
 912 // ----------------------------------------------------------------------------
 913 // wxFileDataObject
 914 // ----------------------------------------------------------------------------
 915
 916 bool wxFileDataObject::SetData(size_t WXUNUSED(size), const void *pData)
 917 {
 918     m_filenames.Empty();
 919
 920     // the documentation states that the first member of DROPFILES structure is
 921     // a "DWORD offset of double NUL terminated file list". What they mean by
 922     // this (I wonder if you see it immediately) is that the list starts at
 923     // ((char *)&(pDropFiles.pFiles)) + pDropFiles.pFiles. We're also advised
 924     // to use DragQueryFile to work with this structure, but not told where and
 925     // how to get HDROP.
 926     HDROP hdrop = (HDROP)pData;   // NB: it works, but I'm not sure about it
 927
 928     // get number of files (magic value -1)
 929     UINT nFiles = ::DragQueryFile(hdrop, (unsigned)-1, NULL, 0u);
 930
 931     // for each file get the length, allocate memory and then get the name
 932     wxString str;
 933     UINT len, n;
 934     for ( n = 0; n < nFiles; n++ ) {
 935         // +1 for terminating NUL
 936         len = ::DragQueryFile(hdrop, n, NULL, 0) + 1;
 937
 938         UINT len2 = ::DragQueryFile(hdrop, n, str.GetWriteBuf(len), len);
 939         str.UngetWriteBuf();
 940         m_filenames.Add(str);
 941
 942         if ( len2 != len - 1 ) {
 943             wxLogDebug(wxT("In wxFileDropTarget::OnDrop DragQueryFile returned"
 944                            " %d characters, %d expected."), len2, len - 1);
 945         }
 946     }
 947
 948     return TRUE;
 949 }
 950
 951 void wxFileDataObject::AddFile(const wxString& file)
 952 {
 953     // just add file to filenames array
 954     // all useful data (such as DROPFILES struct) will be
 955     // created later as necessary
 956     m_filenames.Add(file);
 957 }
 958
 959 size_t wxFileDataObject::GetDataSize() const
 960 {
 961     // size returned will be the size of the DROPFILES structure,
 962     // plus the list of filesnames (null byte separated), plus
 963     // a double null at the end
 964
 965     // if no filenames in list, size is 0
 966     if ( m_filenames.GetCount() == 0 )
 967         return 0;
 968
 969     // inital size of DROPFILES struct + null byte
 970     size_t sz = sizeof(DROPFILES) + 1;
 971
 972     size_t count = m_filenames.GetCount();
 973     for ( size_t i = 0; i < count; i++ )
 974     {
 975         // add filename length plus null byte
 976         sz += m_filenames[i].Len() + 1;
 977     }
 978
 979     return sz;
 980 }
 981
 982 bool wxFileDataObject::GetDataHere(void *pData) const
 983 {
 984     // pData points to an externally allocated memory block
 985     // created using the size returned by GetDataSize()
 986
 987     // if pData is NULL, or there are no files, return
 988     if ( !pData || m_filenames.GetCount() == 0 )
 989         return FALSE;
 990
 991     // convert data pointer to a DROPFILES struct pointer
 992     LPDROPFILES pDrop = (LPDROPFILES) pData;
 993
 994     // initialize DROPFILES struct
 995     pDrop->pFiles = sizeof(DROPFILES);
 996     pDrop->fNC = FALSE;                 // not non-client coords
 997 #if wxUSE_UNICODE
 998     pDrop->fWide = TRUE;
 999 #else // ANSI
1000     pDrop->fWide = FALSE;
1001 #endif // Unicode/Ansi
1002
1003     // set start of filenames list (null separated)
1004     wxChar *pbuf = (wxChar*) ((BYTE *)pDrop + sizeof(DROPFILES));
1005
1006     size_t count = m_filenames.GetCount();
1007     for (size_t i = 0; i < count; i++ )
1008     {
1009         // copy filename to pbuf and add null terminator
1010         size_t len = m_filenames[i].Len();
1011         memcpy(pbuf, m_filenames[i], len);
1012         pbuf += len;
1013         *pbuf++ = wxT('\0');
1014     }
1015
1016     *pbuf = wxT('\0');  // add final null terminator
1017
1018     return TRUE;
1019 }
1020
1021 // ----------------------------------------------------------------------------
1022 // private functions
1023 // ----------------------------------------------------------------------------
1024
1025 static size_t wxGetNumOfBitmapColors(size_t bitsPerPixel)
1026 {
1027     switch ( bitsPerPixel )
1028     {
1029         case 1:
1030             // monochrome bitmap, 2 entries
1031             return 2;
1032
1033         case 4:
1034             return 16;
1035
1036         case 8:
1037             return 256;
1038
1039         case 24:
1040             // may be used with 24bit bitmaps, but we don't use it here - fall
1041             // through
1042
1043         case 16:
1044         case 32:
1045             // bmiColors not used at all with these bitmaps
1046             return 0;
1047
1048         default:
1049             wxFAIL_MSG( wxT("unknown bitmap format") );
1050             return 0;
1051     }
1052 }
1053
1054 size_t wxConvertBitmapToDIB(BITMAPINFO *pbi, const wxBitmap& bitmap)
1055 {
1056     wxASSERT_MSG( bitmap.Ok(), wxT("invalid bmp can't be converted to DIB") );
1057
1058     // shouldn't be selected into a DC or GetDIBits() would fail
1059     wxASSERT_MSG( !bitmap.GetSelectedInto(),
1060                   wxT("can't copy bitmap selected into wxMemoryDC") );
1061
1062     // prepare all the info we need
1063     BITMAP bm;
1064     HBITMAP hbmp = (HBITMAP)bitmap.GetHBITMAP();
1065     if ( !GetObject(hbmp, sizeof(bm), &bm) )
1066     {
1067         wxLogLastError("GetObject(bitmap)");
1068
1069         return 0;
1070     }
1071
1072     // calculate the number of bits per pixel and the number of items in
1073     // bmiColors array (whose meaning depends on the bitmap format)
1074     WORD biBits = bm.bmPlanes * bm.bmBitsPixel;
1075     WORD biColors = wxGetNumOfBitmapColors(biBits);
1076
1077     BITMAPINFO bi2;
1078
1079     bool wantSizeOnly = pbi == NULL;
1080     if ( wantSizeOnly )
1081         pbi = &bi2;
1082
1083     // just for convenience
1084     BITMAPINFOHEADER& bi = pbi->bmiHeader;
1085
1086     bi.biSize = sizeof(BITMAPINFOHEADER);
1087     bi.biWidth = bm.bmWidth;
1088     bi.biHeight = bm.bmHeight;
1089     bi.biPlanes = 1;
1090     bi.biBitCount = biBits;
1091     bi.biCompression = BI_RGB;
1092     bi.biSizeImage = 0;
1093     bi.biXPelsPerMeter = 0;
1094     bi.biYPelsPerMeter = 0;
1095     bi.biClrUsed = 0;
1096     bi.biClrImportant = 0;
1097
1098     // memory we need for BITMAPINFO only
1099     DWORD dwLen = bi.biSize + biColors * sizeof(RGBQUAD);
1100
1101     // first get the image size
1102     ScreenHDC hdc;
1103     if ( !GetDIBits(hdc, hbmp, 0, bi.biHeight, NULL, pbi, DIB_RGB_COLORS) )
1104     {
1105         wxLogLastError("GetDIBits(NULL)");
1106
1107         return 0;
1108     }
1109
1110     if ( wantSizeOnly )
1111     {
1112         // size of the header + size of the image
1113         return dwLen + bi.biSizeImage;
1114     }
1115
1116     // and now copy the bits
1117     void *image = (char *)pbi + dwLen;
1118     if ( !GetDIBits(hdc, hbmp, 0, bi.biHeight, image, pbi, DIB_RGB_COLORS) )
1119     {
1120         wxLogLastError("GetDIBits");
1121
1122         return 0;
1123     }
1124
1125     return dwLen + bi.biSizeImage;
1126 }
1127
1128 wxBitmap wxConvertDIBToBitmap(const BITMAPINFO *pbmi)
1129 {
1130     // here we get BITMAPINFO struct followed by the actual bitmap bits and
1131     // BITMAPINFO starts with BITMAPINFOHEADER followed by colour info
1132     const BITMAPINFOHEADER *pbmih = &pbmi->bmiHeader;
1133
1134     // offset of image from the beginning of the header
1135     DWORD ofs = wxGetNumOfBitmapColors(pbmih->biBitCount) * sizeof(RGBQUAD);
1136     void *image = (char *)pbmih + sizeof(BITMAPINFOHEADER) + ofs;
1137
1138     ScreenHDC hdc;
1139     HBITMAP hbmp = CreateDIBitmap(hdc, pbmih, CBM_INIT,
1140                                   image, pbmi, DIB_RGB_COLORS);
1141     if ( !hbmp )
1142     {
1143         wxLogLastError("CreateDIBitmap");
1144     }
1145
1146     wxBitmap bitmap(pbmih->biWidth, pbmih->biHeight, pbmih->biBitCount);
1147     bitmap.SetHBITMAP((WXHBITMAP)hbmp);
1148
1149     return bitmap;
1150 }
1151
1152 #ifdef __WXDEBUG__
1153
1154 static const wxChar *GetTymedName(DWORD tymed)
1155 {
1156     static wxChar s_szBuf[128];
1157     switch ( tymed ) {
1158         case TYMED_HGLOBAL:   return wxT("TYMED_HGLOBAL");
1159         case TYMED_FILE:      return wxT("TYMED_FILE");
1160         case TYMED_ISTREAM:   return wxT("TYMED_ISTREAM");
1161         case TYMED_ISTORAGE:  return wxT("TYMED_ISTORAGE");
1162         case TYMED_GDI:       return wxT("TYMED_GDI");
1163         case TYMED_MFPICT:    return wxT("TYMED_MFPICT");
1164         case TYMED_ENHMF:     return wxT("TYMED_ENHMF");
1165         default:
1166             wxSprintf(s_szBuf, wxT("type of media format %d (unknown)"), tymed);
1167             return s_szBuf;
1168     }
1169 }
1170
1171 #endif // Debug
1172
1173 #endif // not using OLE at all
1174