src/os2/dnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/os2/dnd.cpp
   3 // Purpose:     wxDropTarget, wxDropSource, wxDataObject implementation
   4 // Author:      David Webster
   5 // Modified by:
   6 // Created:     10/21/99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 AUTHOR
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #if wxUSE_DRAG_AND_DROP
  16
  17 #include "wx/dnd.h"
  18
  19 #ifndef WX_PRECOMP
  20     #include "wx/app.h"
  21     #include "wx/window.h"
  22     #include "wx/gdicmn.h"
  23 #endif
  24
  25 #define INCL_PM
  26 #define INCL_DOS
  27 #include <os2.h>
  28
  29 // ----------------------------------------------------------------------------
  30 // global
  31 // ----------------------------------------------------------------------------
  32
  33 /////////////////////////////////////////////////////////////////////////////
  34 // Private functions
  35 /////////////////////////////////////////////////////////////////////////////
  36
  37 #if 0
  38 static wxDragResult ConvertDragEffectToResult (
  39   DWORD                             dwEffect
  40 )
  41 {
  42     switch (dwEffect)
  43     {
  44         case DO_COPY:
  45             return wxDragCopy;
  46
  47         case DO_LINK:
  48             return wxDragLink;
  49
  50         case DO_MOVE:
  51             return wxDragMove;
  52
  53         default:
  54         case DO_DEFAULT:
  55             return wxDragNone;
  56     }
  57 } // end of ConvertDragEffectToResult
  58
  59 static DWORD ConvertDragResultToEffect (
  60   wxDragResult                      eResult
  61 )
  62 {
  63     switch (eResult)
  64     {
  65         case wxDragCopy:
  66             return DO_COPY;
  67
  68         case wxDragLink:
  69             return DO_LINK;
  70
  71         case wxDragMove:
  72             return DO_MOVE;
  73
  74         default:
  75         case wxDragNone:
  76             return DO_DEFAULT;
  77     }
  78 } // end of ConvertDragResultToEffect
  79 #endif
  80
  81 class CIDropTarget
  82 {
  83 public:
  84     CIDropTarget(wxDropTarget* pTarget)
  85     {
  86         m_pTarget   = pTarget;
  87         m_pDragItem = NULL;
  88     }
  89     virtual ~CIDropTarget() { }
  90
  91     //
  92     // Accessors for CDropTarget
  93     //
  94     void      Free(void) { ::DrgFreeDraginfo(m_pDragInfo); }
  95     PDRAGINFO GetDataSource(void) { return m_pDragInfo; }
  96     void      SetDataSource(PDRAGINFO pDragInfo) { m_pDragInfo = pDragInfo; }
  97     void      SetHWND(HWND hWnd) { m_hWnd = hWnd; }
  98
  99     //
 100     // CIDropTarget methods
 101     //
 102            bool    DragLeave(void);
 103            MRESULT DragOver(void);
 104            MRESULT Drop(void);
 105
 106 protected:
 107
 108     PDRAGINFO                       m_pDragInfo;
 109     PDRAGITEM                       m_pDragItem; // !NULL between DragEnter and DragLeave/Drop
 110     wxDropTarget*                   m_pTarget;   // the real target (we're just a proxy)
 111     HWND                            m_hWnd;      // window we're associated with
 112 }; // end of CLASS CIDropTarget
 113
 114 bool CIDropTarget::DragLeave()
 115 {
 116     //
 117     // Remove the UI feedback
 118     //
 119     m_pTarget->OnLeave();
 120
 121     //
 122     // Release the held object
 123     //
 124     Free();
 125     return true;
 126 } // end of CIDropTarget::DragLeave
 127
 128 MRESULT CIDropTarget::DragOver ()
 129 {
 130     char                            zBuffer[128];
 131     ULONG                           ulBytes;
 132     USHORT                          uOp = 0;
 133     USHORT                          uIndicator;
 134     ULONG                           ulItems;
 135     ULONG                           i;
 136
 137     ::DrgAccessDraginfo(m_pDragInfo);
 138     switch(m_pDragInfo->usOperation)
 139     {
 140         case DO_UNKNOWN:
 141             Free();
 142             return (MRFROM2SHORT(DOR_NODROPOP, 0));
 143
 144         case DO_DEFAULT:
 145             m_pDragItem = ::DrgQueryDragitemPtr(m_pDragInfo, 0);
 146             ulBytes     = ::DrgQueryStrName( m_pDragItem->hstrContainerName
 147                                             ,128
 148                                             ,zBuffer
 149                                            );
 150             if (!ulBytes)
 151                 return (MRFROM2SHORT(DOR_NODROPOP, 0));
 152             else
 153                 uOp = DO_MOVE;
 154             break;
 155
 156         case DO_COPY:
 157         case DO_MOVE:
 158             uOp = m_pDragInfo->usOperation;
 159             break;
 160     }
 161     uIndicator = DOR_DROP;
 162     ulItems = (ULONG)::DrgQueryDragitemCount(m_pDragInfo);
 163     for (i = 0; i < ulItems; i++)
 164     {
 165         m_pDragItem = ::DrgQueryDragitemPtr(m_pDragInfo, i);
 166         if (((m_pDragItem->fsSupportedOps & DO_COPYABLE) &&
 167              (uOp == (USHORT)DO_COPY))                   ||
 168             ((m_pDragItem->fsSupportedOps & DO_MOVEABLE) &&
 169              (uOp == (USHORT)DO_COPY)))
 170         {
 171             if (::DrgVerifyRMF(m_pDragItem, "DRM_OS2FILE", "DRF_UNKNOWN"))
 172                 uIndicator = (USHORT)DOR_DROP;
 173             else
 174                 uIndicator = (USHORT)DOR_NEVERDROP;
 175         }
 176     }
 177     Free();
 178     return (MRFROM2SHORT(uIndicator, uOp));
 179 } // end of CIDropTarget::DragOver
 180
 181 // #pragma page   "CIDropTarget::Drop"
 182 /////////////////////////////////////////////////////////////////////////////
 183 //
 184 // CIDropTarget::Drop
 185 //
 186 //   Instructs the drop target to paste data that was just now dropped on it.
 187 //
 188 // PARAMETERS
 189 //   pIDataSource -- the data to paste
 190 //   dwKeyState   -- kbd & mouse state
 191 //   pt           -- mouse coordinates
 192 //   pdwEffect    -- effect flag
 193 //
 194 // RETURN VALUE
 195 //  STDMETHODIMP S_OK
 196 //
 197 /////////////////////////////////////////////////////////////////////////////
 198 MRESULT CIDropTarget::Drop ()
 199 {
 200     char                            zBuffer[128];
 201     ULONG                           ulBytes;
 202     USHORT                          uOp = 0;
 203     USHORT                          uIndicator;
 204     ULONG                           ulItems;
 205     ULONG                           i;
 206
 207     ::DrgAccessDraginfo(m_pDragInfo);
 208     switch(m_pDragInfo->usOperation)
 209     {
 210         case DO_UNKNOWN:
 211             Free();
 212             return (MRFROM2SHORT(DOR_NODROPOP, 0));
 213
 214         case DO_DEFAULT:
 215             m_pDragItem = ::DrgQueryDragitemPtr(m_pDragInfo, 0);
 216             ulBytes     = ::DrgQueryStrName( m_pDragItem->hstrContainerName
 217                                             ,128
 218                                             ,zBuffer
 219                                            );
 220             if (!ulBytes)
 221                 return (MRFROM2SHORT(DOR_NODROPOP, 0));
 222             else
 223                 uOp = DO_MOVE;
 224             break;
 225
 226         case DO_COPY:
 227         case DO_MOVE:
 228             uOp = m_pDragInfo->usOperation;
 229             break;
 230     }
 231     uIndicator = DOR_DROP;
 232     ulItems = (ULONG)::DrgQueryDragitemCount(m_pDragInfo);
 233     for (i = 0; i < ulItems; i++)
 234     {
 235         m_pDragItem = ::DrgQueryDragitemPtr(m_pDragInfo, i);
 236         if (((m_pDragItem->fsSupportedOps & DO_COPYABLE) &&
 237              (uOp == (USHORT)DO_COPY))                   ||
 238             ((m_pDragItem->fsSupportedOps & DO_MOVEABLE) &&
 239              (uOp == (USHORT)DO_COPY)))
 240         {
 241             if (::DrgVerifyRMF(m_pDragItem, "DRM_OS2FILE", "DRF_UNKNOWN"))
 242                 uIndicator = (USHORT)DOR_DROP;
 243             else
 244                 uIndicator = (USHORT)DOR_NEVERDROP;
 245         }
 246     }
 247
 248     //
 249     // First ask the drop target if it wants data
 250     //
 251     if (m_pTarget->OnDrop( m_pDragInfo->xDrop
 252                           ,m_pDragInfo->yDrop
 253                          ))
 254     {
 255         wxDragResult                 eRc = wxDragNone;
 256
 257         //
 258         // And now it has the data
 259         //
 260         eRc = m_pTarget->OnData( m_pDragInfo->xDrop
 261                                 ,m_pDragInfo->yDrop
 262                                 ,eRc
 263                                );
 264     }
 265     //else: OnDrop() returned false, no need to copy data
 266
 267     //
 268     // Release the held object
 269     //
 270     Free();
 271     return (MRFROM2SHORT(uIndicator, uOp));
 272 } // end of CIDropTarget::Drop
 273
 274 // ----------------------------------------------------------------------------
 275 // wxDropTarget
 276 // ----------------------------------------------------------------------------
 277
 278 wxDropTarget::wxDropTarget (
 279   wxDataObject*                     pDataObject
 280 )
 281 {
 282     m_dataObject  = pDataObject;
 283     m_pDropTarget = new CIDropTarget(this);
 284 } // end of wxDropTarget::wxDropTarget
 285
 286 wxDropTarget::~wxDropTarget()
 287 {
 288     Release();
 289 } // end of wxDropTarget::~wxDropTarget
 290
 291 bool wxDropTarget::GetData ()
 292 {
 293     wxDataFormat                    vFormat = GetSupportedFormat(m_pDropTarget->GetDataSource());
 294
 295     if (vFormat == wxDF_INVALID)
 296     {
 297         return false;
 298     }
 299     //
 300     // Under OS/2 we already have the data via the attached DRAGITEM's
 301     //
 302     return true;
 303 } // end of wxDropTarget::GetData
 304
 305 wxDataFormat wxDropTarget::GetSupportedFormat (
 306   PDRAGINFO                         pDataSource
 307 ) const
 308 {
 309     PDRAGITEM                       pDragItem;
 310     wxDataFormat                    vFormat;
 311     wxDataFormat*                   pFormats;
 312     ULONG                           ulFormats = m_dataObject->GetFormatCount(wxDataObject::Set);
 313     ULONG                           ulItems = (ULONG)::DrgQueryDragitemCount(pDataSource);
 314     ULONG                           i;
 315     ULONG                           n;
 316     wxString                        sMechanism;
 317     wxString                        sFormat;
 318     bool                            bValid = false;
 319
 320     pFormats = ulFormats == 1 ? &vFormat :  new wxDataFormat[ulFormats];
 321     m_dataObject->GetAllFormats( pFormats
 322                                 ,wxDataObject::Set
 323                                );
 324
 325     for (n = 0; n < ulFormats; n++)
 326     {
 327         switch(pFormats[n].GetType())
 328         {
 329             case wxDF_TEXT:
 330             case wxDF_FILENAME:
 331             case wxDF_HTML:
 332                 sMechanism = _T("DRM_OS2FILE");
 333                 sFormat    = _T("DRF_TEXT");
 334                 break;
 335
 336             case wxDF_OEMTEXT:
 337                 sMechanism = _T("DRM_OS2FILE");
 338                 sFormat    = _T("DRF_OEMTEXT");
 339                 break;
 340
 341             case wxDF_BITMAP:
 342                 sMechanism = _T("DRM_OS2FILE");
 343                 sFormat    = _T("DRF_BITMAP");
 344                 break;
 345
 346             case wxDF_METAFILE:
 347             case wxDF_ENHMETAFILE:
 348                 sMechanism = _T("DRM_OS2FILE");
 349                 sFormat    = _T("DRF_METAFILE");
 350                 break;
 351
 352             case wxDF_TIFF:
 353                 sMechanism = _T("DRM_OS2FILE");
 354                 sFormat    = _T("DRF_TIFF");
 355                 break;
 356
 357             case wxDF_SYLK:
 358                 sMechanism = _T("DRM_OS2FILE");
 359                 sFormat    = _T("DRF_SYLK");
 360                 break;
 361
 362             case wxDF_DIF:
 363                 sMechanism = _T("DRM_OS2FILE");
 364                 sFormat    = _T("DRF_DIF");
 365                 break;
 366
 367             case wxDF_DIB:
 368                 sMechanism = _T("DRM_OS2FILE");
 369                 sFormat    = _T("DRF_DIB");
 370                 break;
 371
 372             case wxDF_PALETTE:
 373             case wxDF_PENDATA:
 374             case wxDF_RIFF:
 375             case wxDF_WAVE:
 376             case wxDF_UNICODETEXT:
 377             case wxDF_LOCALE:
 378                 sMechanism = _T("DRM_OS2FILE");
 379                 sFormat    = _T("DRF_UNKNOWN");
 380                 break;
 381
 382             case wxDF_PRIVATE:
 383                 sMechanism = _T("DRM_OBJECT");
 384                 sFormat    = _T("DRF_UNKNOWN");
 385                 break;
 386         }
 387         for (i = 0; i < ulItems; i++)
 388         {
 389             pDragItem = ::DrgQueryDragitemPtr(pDataSource, i);
 390             if (::DrgVerifyRMF(pDragItem, sMechanism.c_str(), sFormat.c_str()))
 391             {
 392                 bValid = true;
 393                 break;
 394             }
 395         }
 396         if (bValid)
 397         {
 398             vFormat = pFormats[n];
 399             break;
 400         }
 401     }
 402     if (pFormats != &vFormat)
 403     {
 404         //
 405         // Free memory if we allocated it
 406         //
 407         delete [] pFormats;
 408     }
 409     return (n < ulFormats ? vFormat : wxFormatInvalid);
 410 } // end of wxDropTarget::GetSupportedFormat
 411
 412 bool wxDropTarget::IsAcceptedData (
 413   PDRAGINFO                         pDataSource
 414 ) const
 415 {
 416     return (GetSupportedFormat(pDataSource) != wxDF_INVALID);
 417 } // end of wxDropTarget::IsAcceptedData
 418
 419 void wxDropTarget::Release ()
 420 {
 421     m_pDropTarget->Free();
 422 } // end of wxDropTarget::Release
 423
 424
 425 wxDragResult wxDropTarget::OnData (
 426   wxCoord                           WXUNUSED(vX)
 427 , wxCoord                           WXUNUSED(y)
 428 , wxDragResult                      WXUNUSED(vResult)
 429 )
 430 {
 431     return (wxDragResult)0;
 432 } // end of wxDropTarget::OnData
 433
 434 bool wxDropTarget::OnDrop (
 435   wxCoord                           WXUNUSED(x)
 436 , wxCoord                           WXUNUSED(y)
 437 )
 438 {
 439     return true;
 440 } // end of wxDropTarget::OnDrop
 441
 442 //-------------------------------------------------------------------------
 443 // wxDropSource
 444 //-------------------------------------------------------------------------
 445
 446 wxDropSource::wxDropSource ( wxWindow* WXUNUSED(pWin) )
 447 {
 448     Init();
 449 } // end of wxDropSource::wxDropSource
 450
 451 wxDropSource::wxDropSource ( wxDataObject& rData, wxWindow* WXUNUSED(pWin) )
 452 {
 453     Init();
 454     SetData(rData);
 455 } // end of wxDropSource::wxDropSource
 456
 457 wxDropSource::~wxDropSource ()
 458 {
 459     ::DrgFreeDraginfo(m_pDragInfo);
 460 } // end of wxDropSource::~wxDropSource
 461
 462 wxDragResult wxDropSource::DoDragDrop (
 463   int                              WXUNUSED(flags)
 464 )
 465 {
 466     //
 467     // Need to specify drag items in derived classes that know their data types
 468     // before calling DoDragDrop
 469     //
 470     if (::DrgDrag( m_pWindow->GetHWND()
 471                   ,m_pDragInfo
 472                   ,&m_vDragImage
 473                   ,m_ulItems
 474                   ,VK_BUTTON2
 475                   ,NULL
 476                  ) != NULLHANDLE)
 477     {
 478         switch(m_pDragInfo->usOperation)
 479         {
 480             case DO_COPY:
 481                 return wxDragCopy;
 482
 483             case DO_MOVE:
 484                 return wxDragCopy;
 485
 486             case DO_LINK:
 487                 return wxDragCopy;
 488
 489             default:
 490                 return wxDragNone;
 491         }
 492     }
 493     return wxDragError;
 494 } // end of wxDropSource::DoDragDrop
 495
 496 bool wxDropSource::GiveFeedback (
 497   wxDragResult                      eEffect
 498 )
 499 {
 500     const wxCursor&                 rCursor = GetCursor(eEffect);
 501
 502     if (rCursor.Ok())
 503     {
 504         ::WinSetPointer(HWND_DESKTOP, (HPOINTER)rCursor.GetHCURSOR());
 505         m_vDragImage.hImage = (LHANDLE)rCursor.GetHCURSOR();
 506         switch(eEffect)
 507         {
 508             case wxDragCopy:
 509                 m_pDragInfo->usOperation = DO_COPY;
 510                 break;
 511
 512             case wxDragMove:
 513                 m_pDragInfo->usOperation = DO_MOVE;
 514                 break;
 515
 516             case wxDragLink:
 517                 m_pDragInfo->usOperation = DO_LINK;
 518                 break;
 519
 520             case wxDragNone:
 521             case wxDragCancel:
 522             case wxDragError:
 523                 break;
 524         }
 525         return true;
 526     }
 527     else
 528     {
 529         return false;
 530     }
 531 } // end of GuiAdvDnd_CDropSource::GiveFeedback
 532
 533 void wxDropSource::Init ()
 534 {
 535     m_pDragInfo = ::DrgAllocDraginfo(m_ulItems);
 536
 537     //
 538     // Set a default drag image struct with what we know so far
 539     //
 540     m_vDragImage.cb             = sizeof(DRAGIMAGE);
 541     m_vDragImage.cptl           = 0;  // non-zero if fl is DRG_POLYGON
 542     m_vDragImage.hImage         = 0;  // Set in GiveFeedback
 543     m_vDragImage.sizlStretch.cx = 20L;
 544     m_vDragImage.sizlStretch.cy = 20L;
 545     m_vDragImage.fl             = DRG_ICON | DRG_STRETCH;
 546     m_vDragImage.cxOffset       = 0;
 547     m_vDragImage.cyOffset       = 0;
 548
 549     HSTR    hStrType = ::DrgAddStrHandle(DRT_UNKNOWN);
 550     HSTR    hStrRMF;
 551     HSTR    hStrContainer;
 552     wxChar  zFormats[128];
 553     wxChar  zContainer[128];
 554     USHORT  uSize = (USHORT)(GetDataObject()->GetDataSize(GetDataObject()->GetPreferredFormat()) + 1);
 555     wxChar* pzBuffer = new wxChar[uSize];
 556
 557     memset(pzBuffer, '\0', GetDataObject()->GetDataSize(GetDataObject()->GetPreferredFormat()));
 558     pzBuffer[GetDataObject()->GetDataSize(GetDataObject()->GetPreferredFormat())] = '\0';
 559     GetDataObject()->GetDataHere( GetDataObject()->GetPreferredFormat()
 560                                  ,(void*)pzBuffer
 561                                 );
 562
 563     wxStrcpy(zFormats, _T("<DRM_OS2FILE, DRF_UNKNOWN>"));
 564     wxStrcpy(zContainer, GetDataObject()->GetPreferredFormat().GetId());
 565
 566     hStrRMF       = ::DrgAddStrHandle((PSZ)zFormats);
 567     hStrContainer = ::DrgAddStrHandle((PSZ)zContainer);
 568
 569     m_pDragItem = new DRAGITEM[m_ulItems];
 570     for (ULONG i = 0; i < m_ulItems; i++)
 571     {
 572         m_pDragItem[i].hwndItem          = m_pWindow->GetHWND();
 573         m_pDragItem[i].hstrType          = hStrType;
 574         m_pDragItem[i].hstrRMF           = hStrRMF;
 575         m_pDragItem[i].hstrContainerName = hStrContainer;
 576         m_pDragItem[i].fsControl         = 0;
 577         m_pDragItem[i].fsSupportedOps    = DO_COPYABLE | DO_MOVEABLE | DO_LINKABLE;
 578         m_pDragItem[i].hstrSourceName    = ::DrgAddStrHandle((PSZ)pzBuffer);
 579         m_pDragItem[i].hstrTargetName    = m_pDragItem[i].hstrSourceName;
 580         m_pDragItem[i].ulItemID          = i;
 581         ::DrgSetDragitem( m_pDragInfo
 582                          ,&m_pDragItem[i]
 583                          ,sizeof(DRAGITEM)
 584                          ,0
 585                         );
 586     }
 587     delete [] pzBuffer;
 588     delete [] m_pDragItem;
 589 } // end of wxDropSource::Init
 590
 591 #endif //wxUSE_DRAG_AND_DROP