src/os2/dnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #ifdef __GNUG__
  13 #pragma implementation "dnd.h"
  14 #endif
  15
  16 #include "wx/window.h"
  17 #include "wx/app.h"
  18 #include "wx/gdicmn.h"
  19 #include "wx/dnd.h"
  20
  21 #define INCL_PM
  22 #define INCL_DOS
  23 #include <os2.h>
  24
  25 #if wxUSE_DRAG_AND_DROP
  26
  27 // ----------------------------------------------------------------------------
  28 // global
  29 // ----------------------------------------------------------------------------
  30
  31 /////////////////////////////////////////////////////////////////////////////
  32 // Private functions
  33 /////////////////////////////////////////////////////////////////////////////
  34
  35 #if 0
  36 static wxDragResult ConvertDragEffectToResult (
  37   DWORD                             dwEffect
  38 )
  39 {
  40     switch (dwEffect)
  41     {
  42         case DO_COPY:
  43             return wxDragCopy;
  44
  45         case DO_LINK:
  46             return wxDragLink;
  47
  48         case DO_MOVE:
  49             return wxDragMove;
  50
  51         default:
  52         case DO_DEFAULT:
  53             return wxDragNone;
  54     }
  55 } // end of ConvertDragEffectToResult
  56
  57 static DWORD ConvertDragResultToEffect (
  58   wxDragResult                      eResult
  59 )
  60 {
  61     switch (eResult)
  62     {
  63         case wxDragCopy:
  64             return DO_COPY;
  65
  66         case wxDragLink:
  67             return DO_LINK;
  68
  69         case wxDragMove:
  70             return DO_MOVE;
  71
  72         default:
  73         case wxDragNone:
  74             return DO_DEFAULT;
  75     }
  76 } // end of ConvertDragResultToEffect
  77 #endif
  78
  79 class CIDropTarget
  80 {
  81 public:
  82     CIDropTarget(wxDropTarget* pTarget)
  83     {
  84         m_pTarget   = pTarget;
  85         m_pDragItem = NULL;
  86     }
  87     virtual ~CIDropTarget() { }
  88
  89     //
  90     // Accessors for CDropTarget
  91     //
  92     void      Free(void) { ::DrgFreeDraginfo(m_pDragInfo); }
  93     PDRAGINFO GetDataSource(void) { return m_pDragInfo; }
  94     void      SetDataSource(PDRAGINFO pDragInfo) { m_pDragInfo = pDragInfo; }
  95     void      SetHWND(HWND hWnd) { m_hWnd = hWnd; }
  96
  97     //
  98     // CIDropTarget methods
  99     //
 100            bool    DragLeave(void);
 101            MRESULT DragOver(void);
 102            MRESULT Drop(void);
 103
 104 protected:
 105
 106     PDRAGINFO                       m_pDragInfo;
 107     PDRAGITEM                       m_pDragItem; // !NULL between DragEnter and DragLeave/Drop
 108     wxDropTarget*                   m_pTarget;   // the real target (we're just a proxy)
 109     HWND                            m_hWnd;      // window we're associated with
 110 }; // end of CLASS CIDropTarget
 111
 112 bool CIDropTarget::DragLeave()
 113 {
 114     //
 115     // Remove the UI feedback
 116     //
 117     m_pTarget->OnLeave();
 118
 119     //
 120     // Release the held object
 121     //
 122     Free();
 123     return TRUE;
 124 } // end of CIDropTarget::DragLeave
 125
 126 MRESULT CIDropTarget::DragOver ()
 127 {
 128     char                            zBuffer[128];
 129     ULONG                           ulBytes;
 130     USHORT                          uOp;
 131     USHORT                          uIndicator;
 132     ULONG                           ulItems;
 133     ULONG                           i;
 134
 135     ::DrgAccessDraginfo(m_pDragInfo);
 136     switch(m_pDragInfo->usOperation)
 137     {
 138         case DO_UNKNOWN:
 139             Free();
 140             return (MRFROM2SHORT(DOR_NODROPOP, 0));
 141
 142         case DO_DEFAULT:
 143             m_pDragItem = ::DrgQueryDragitemPtr(m_pDragInfo, 0);
 144             ulBytes     = ::DrgQueryStrName( m_pDragItem->hstrContainerName
 145                                             ,128
 146                                             ,zBuffer
 147                                            );
 148             if (!ulBytes)
 149                 return (MRFROM2SHORT(DOR_NODROPOP, 0));
 150             else
 151                 uOp = DO_MOVE;
 152             break;
 153
 154         case DO_COPY:
 155         case DO_MOVE:
 156             uOp = m_pDragInfo->usOperation;
 157             break;
 158     }
 159     uIndicator = DOR_DROP;
 160     ulItems = (ULONG)::DrgQueryDragitemCount(m_pDragInfo);
 161     for (i = 0; i < ulItems; i++)
 162     {
 163         m_pDragItem = ::DrgQueryDragitemPtr(m_pDragInfo, i);
 164         if (((m_pDragItem->fsSupportedOps & DO_COPYABLE) &&
 165              (uOp == (USHORT)DO_COPY))                   ||
 166             ((m_pDragItem->fsSupportedOps & DO_MOVEABLE) &&
 167              (uOp == (USHORT)DO_COPY)))
 168         {
 169             if (::DrgVerifyRMF(m_pDragItem, "DRM_OS2FILE", "DRF_UNKNOWN"))
 170                 uIndicator = (USHORT)DOR_DROP;
 171             else
 172                 uIndicator = (USHORT)DOR_NEVERDROP;
 173         }
 174     }
 175     Free();
 176     return (MRFROM2SHORT(uIndicator, uOp));
 177 } // end of CIDropTarget::DragOver
 178
 179 // #pragma page   "CIDropTarget::Drop"
 180 /////////////////////////////////////////////////////////////////////////////
 181 //
 182 // CIDropTarget::Drop
 183 //
 184 //   Instructs the drop target to paste data that was just now dropped on it.
 185 //
 186 // PARAMETERS
 187 //   pIDataSource -- the data to paste
 188 //   dwKeyState   -- kbd & mouse state
 189 //   pt           -- mouse coordinates
 190 //   pdwEffect    -- effect flag
 191 //
 192 // RETURN VALUE
 193 //  STDMETHODIMP S_OK
 194 //
 195 /////////////////////////////////////////////////////////////////////////////
 196 MRESULT CIDropTarget::Drop ()
 197 {
 198     char                            zBuffer[128];
 199     ULONG                           ulBytes;
 200     USHORT                          uOp;
 201     USHORT                          uIndicator;
 202     ULONG                           ulItems;
 203     ULONG                           i;
 204
 205     ::DrgAccessDraginfo(m_pDragInfo);
 206     switch(m_pDragInfo->usOperation)
 207     {
 208         case DO_UNKNOWN:
 209             Free();
 210             return (MRFROM2SHORT(DOR_NODROPOP, 0));
 211
 212         case DO_DEFAULT:
 213             m_pDragItem = ::DrgQueryDragitemPtr(m_pDragInfo, 0);
 214             ulBytes     = ::DrgQueryStrName( m_pDragItem->hstrContainerName
 215                                             ,128
 216                                             ,zBuffer
 217                                            );
 218             if (!ulBytes)
 219                 return (MRFROM2SHORT(DOR_NODROPOP, 0));
 220             else
 221                 uOp = DO_MOVE;
 222             break;
 223
 224         case DO_COPY:
 225         case DO_MOVE:
 226             uOp = m_pDragInfo->usOperation;
 227             break;
 228     }
 229     uIndicator = DOR_DROP;
 230     ulItems = (ULONG)::DrgQueryDragitemCount(m_pDragInfo);
 231     for (i = 0; i < ulItems; i++)
 232     {
 233         m_pDragItem = ::DrgQueryDragitemPtr(m_pDragInfo, i);
 234         if (((m_pDragItem->fsSupportedOps & DO_COPYABLE) &&
 235              (uOp == (USHORT)DO_COPY))                   ||
 236             ((m_pDragItem->fsSupportedOps & DO_MOVEABLE) &&
 237              (uOp == (USHORT)DO_COPY)))
 238         {
 239             if (::DrgVerifyRMF(m_pDragItem, "DRM_OS2FILE", "DRF_UNKNOWN"))
 240                 uIndicator = (USHORT)DOR_DROP;
 241             else
 242                 uIndicator = (USHORT)DOR_NEVERDROP;
 243         }
 244     }
 245
 246     //
 247     // First ask the drop target if it wants data
 248     //
 249     if (m_pTarget->OnDrop( m_pDragInfo->xDrop
 250                           ,m_pDragInfo->yDrop
 251                          ))
 252     {
 253         wxDragResult                 eRc;
 254
 255         //
 256         // And now it has the data
 257         //
 258         eRc = m_pTarget->OnData( m_pDragInfo->xDrop
 259                                 ,m_pDragInfo->yDrop
 260                                 ,eRc
 261                                );
 262     }
 263     //else: OnDrop() returned FALSE, no need to copy data
 264
 265     //
 266     // Release the held object
 267     //
 268     Free();
 269     return (MRFROM2SHORT(uIndicator, uOp));
 270 } // end of CIDropTarget::Drop
 271
 272 // ----------------------------------------------------------------------------
 273 // wxDropTarget
 274 // ----------------------------------------------------------------------------
 275
 276 wxDropTarget::wxDropTarget (
 277   wxDataObject*                     pDataObject
 278 )
 279 {
 280     m_dataObject  = pDataObject;
 281     m_pDropTarget = new CIDropTarget(this);
 282 } // end of wxDropTarget::wxDropTarget
 283
 284 wxDropTarget::~wxDropTarget()
 285 {
 286     Release();
 287 } // end of wxDropTarget::~wxDropTarget
 288
 289 bool wxDropTarget::GetData ()
 290 {
 291     wxDataFormat                    vFormat = GetSupportedFormat(m_pDropTarget->GetDataSource());
 292
 293     if (vFormat == wxDF_INVALID)
 294     {
 295         return FALSE;
 296     }
 297     //
 298     // Under OS/2 we already have the data via the attached DRAGITEM's
 299     //
 300     return TRUE;
 301 } // end of wxDropTarget::GetData
 302
 303 wxDataFormat wxDropTarget::GetSupportedFormat (
 304   PDRAGINFO                         pDataSource
 305 ) const
 306 {
 307     PDRAGITEM                       pDragItem;
 308     wxDataFormat                    vFormat;
 309     wxDataFormat*                   pFormats;
 310     ULONG                           ulFormats = m_dataObject->GetFormatCount(wxDataObject::Set);
 311     ULONG                           ulItems = (ULONG)::DrgQueryDragitemCount(pDataSource);
 312     ULONG                           i;
 313     ULONG                           n;
 314     wxString                        sMechanism;
 315     wxString                        sFormat;
 316     bool                            bValid = FALSE;
 317
 318     pFormats = ulFormats == 1 ? &vFormat :  new wxDataFormat[ulFormats];
 319     m_dataObject->GetAllFormats( pFormats
 320                                 ,wxDataObject::Set
 321                                );
 322
 323     for (n = 0; n < ulFormats; n++)
 324     {
 325         switch(pFormats[n].GetType())
 326         {
 327             case wxDF_TEXT:
 328             case wxDF_FILENAME:
 329             case wxDF_HTML:
 330                 sMechanism = "DRM_OS2FILE";
 331                 sFormat    = "DRF_TEXT";
 332                 break;
 333
 334             case wxDF_OEMTEXT:
 335                 sMechanism = "DRM_OS2FILE";
 336                 sFormat    = "DRF_OEMTEXT";
 337                 break;
 338
 339             case wxDF_BITMAP:
 340                 sMechanism = "DRM_OS2FILE";
 341                 sFormat    = "DRF_BITMAP";
 342                 break;
 343
 344             case wxDF_METAFILE:
 345             case wxDF_ENHMETAFILE:
 346                 sMechanism = "DRM_OS2FILE";
 347                 sFormat    = "DRF_METAFILE";
 348                 break;
 349
 350             case wxDF_TIFF:
 351                 sMechanism = "DRM_OS2FILE";
 352                 sFormat    = "DRF_TIFF";
 353                 break;
 354
 355             case wxDF_SYLK:
 356                 sMechanism = "DRM_OS2FILE";
 357                 sFormat    = "DRF_SYLK";
 358                 break;
 359
 360             case wxDF_DIF:
 361                 sMechanism = "DRM_OS2FILE";
 362                 sFormat    = "DRF_DIF";
 363                 break;
 364
 365             case wxDF_DIB:
 366                 sMechanism = "DRM_OS2FILE";
 367                 sFormat    = "DRF_DIB";
 368                 break;
 369
 370             case wxDF_PALETTE:
 371             case wxDF_PENDATA:
 372             case wxDF_RIFF:
 373             case wxDF_WAVE:
 374             case wxDF_UNICODETEXT:
 375             case wxDF_LOCALE:
 376                 sMechanism = "DRM_OS2FILE";
 377                 sFormat    = "DRF_UNKNOWN";
 378                 break;
 379
 380             case wxDF_PRIVATE:
 381                 sMechanism = "DRM_OBJECT";
 382                 sFormat    = "DRF_UNKNOWN";
 383                 break;
 384         }
 385         for (i = 0; i < ulItems; i++)
 386         {
 387             pDragItem = ::DrgQueryDragitemPtr(pDataSource, i);
 388             if (::DrgVerifyRMF(pDragItem, sMechanism.c_str(), sFormat.c_str()))
 389             {
 390                 bValid = TRUE;
 391                 break;
 392             }
 393         }
 394         if (bValid)
 395         {
 396             vFormat = pFormats[n];
 397             break;
 398         }
 399     }
 400     if (pFormats != &vFormat)
 401     {
 402         //
 403         // Free memory if we allocated it
 404         //
 405         delete [] pFormats;
 406     }
 407     return (n < ulFormats ? vFormat : wxFormatInvalid);
 408 } // end of wxDropTarget::GetSupportedFormat
 409
 410 bool wxDropTarget::IsAcceptedData (
 411   PDRAGINFO                         pDataSource
 412 ) const
 413 {
 414     return (GetSupportedFormat(pDataSource) != wxDF_INVALID);
 415 } // end of wxDropTarget::IsAcceptedData
 416
 417 void wxDropTarget::Release ()
 418 {
 419     m_pDropTarget->Free();
 420 } // end of wxDropTarget::Release
 421
 422
 423 wxDragResult wxDropTarget::OnData (
 424   wxCoord                           WXUNUSED(vX)
 425 , wxCoord                           WXUNUSED(y)
 426 , wxDragResult                      WXUNUSED(vResult)
 427 )
 428 {
 429     return (wxDragResult)0;
 430 } // end of wxDropTarget::OnData
 431
 432 bool wxDropTarget::OnDrop (
 433   wxCoord                           WXUNUSED(x)
 434 , wxCoord                           WXUNUSED(y)
 435 )
 436 {
 437     return TRUE;
 438 } // end of wxDropTarget::OnDrop
 439
 440 //-------------------------------------------------------------------------
 441 // wxDropSource
 442 //-------------------------------------------------------------------------
 443
 444 wxDropSource::wxDropSource (
 445   wxWindow*                         pWin
 446 )
 447 {
 448     Init();
 449 } // end of wxDropSource::wxDropSource
 450
 451 wxDropSource::wxDropSource (
 452   wxDataObject&                     rData
 453 , wxWindow*                         pWin
 454 )
 455 {
 456     Init();
 457     SetData(rData);
 458 } // end of wxDropSource::wxDropSource
 459
 460 wxDropSource::~wxDropSource ()
 461 {
 462     ::DrgFreeDraginfo(m_pDragInfo);
 463 } // end of wxDropSource::~wxDropSource
 464
 465 wxDragResult wxDropSource::DoDragDrop (
 466   int                              WXUNUSED(flags)
 467 )
 468 {
 469     //
 470     // Need to specify drag items in derived classes that know their data types
 471     // before calling DoDragDrop
 472     //
 473     if (::DrgDrag( m_pWindow->GetHWND()
 474                   ,m_pDragInfo
 475                   ,&m_vDragImage
 476                   ,m_ulItems
 477                   ,VK_BUTTON2
 478                   ,NULL
 479                  ) != NULLHANDLE)
 480     {
 481         switch(m_pDragInfo->usOperation)
 482         {
 483             case DO_COPY:
 484                 return wxDragCopy;
 485
 486             case DO_MOVE:
 487                 return wxDragCopy;
 488
 489             case DO_LINK:
 490                 return wxDragCopy;
 491
 492             default:
 493                 return wxDragNone;
 494         }
 495     }
 496     return wxDragError;
 497 } // end of wxDropSource::DoDragDrop
 498
 499 bool wxDropSource::GiveFeedback (
 500   wxDragResult                      eEffect
 501 )
 502 {
 503     const wxCursor&                 rCursor = GetCursor(eEffect);
 504
 505     if (rCursor.Ok())
 506     {
 507         ::WinSetPointer(HWND_DESKTOP, (HPOINTER)rCursor.GetHCURSOR());
 508         m_vDragImage.hImage = (LHANDLE)rCursor.GetHCURSOR();
 509         switch(eEffect)
 510         {
 511             case wxDragCopy:
 512                 m_pDragInfo->usOperation = DO_COPY;
 513                 break;
 514
 515             case wxDragMove:
 516                 m_pDragInfo->usOperation = DO_MOVE;
 517                 break;
 518
 519             case wxDragLink:
 520                 m_pDragInfo->usOperation = DO_LINK;
 521                 break;
 522
 523             case wxDragNone:
 524             case wxDragCancel:
 525             case wxDragError:
 526                 break;
 527         }
 528         return TRUE;
 529     }
 530     else
 531     {
 532         return FALSE;
 533     }
 534 } // end of GuiAdvDnd_CDropSource::GiveFeedback
 535
 536 void wxDropSource::Init ()
 537 {
 538     m_pDragInfo = ::DrgAllocDraginfo(m_ulItems);
 539
 540     //
 541     // Set a default drag image struct with what we know so far
 542     //
 543     m_vDragImage.cb             = sizeof(DRAGIMAGE);
 544     m_vDragImage.cptl           = 0;  // non-zero if fl is DRG_POLYGON
 545     m_vDragImage.hImage         = 0;  // Set in GiveFeedback
 546     m_vDragImage.sizlStretch.cx = 20L;
 547     m_vDragImage.sizlStretch.cy = 20L;
 548     m_vDragImage.fl             = DRG_ICON | DRG_STRETCH;
 549     m_vDragImage.cxOffset       = 0;
 550     m_vDragImage.cyOffset       = 0;
 551
 552     HSTR                            hStrType = ::DrgAddStrHandle(DRT_UNKNOWN);
 553     HSTR                            hStrRMF;
 554     HSTR                            hStrContainer;
 555     char                            zFormats[128];
 556     char                            zContainer[128];
 557     USHORT                          uSize = GetDataObject()->GetDataSize(GetDataObject()->GetPreferredFormat()) + 1;
 558     char*                           pzBuffer = new char[uSize];
 559
 560     memset(pzBuffer, '\0', GetDataObject()->GetDataSize(GetDataObject()->GetPreferredFormat()));
 561     pzBuffer[GetDataObject()->GetDataSize(GetDataObject()->GetPreferredFormat())] = '\0';
 562     GetDataObject()->GetDataHere( GetDataObject()->GetPreferredFormat()
 563                                  ,(void*)pzBuffer
 564                                 );
 565
 566     strcpy(zFormats, "<DRM_OS2FILE, DRF_UNKNOWN>");
 567     strcpy(zContainer, GetDataObject()->GetPreferredFormat().GetId().c_str());
 568
 569     hStrRMF       = ::DrgAddStrHandle(zFormats);
 570     hStrContainer = ::DrgAddStrHandle(zContainer);
 571
 572     m_pDragItem = new DRAGITEM[m_ulItems];
 573     for (ULONG i = 0; i < m_ulItems; i++)
 574     {
 575         m_pDragItem[i].hwndItem          = m_pWindow->GetHWND();
 576         m_pDragItem[i].hstrType          = hStrType;
 577         m_pDragItem[i].hstrRMF           = hStrRMF;
 578         m_pDragItem[i].hstrContainerName = hStrContainer;
 579         m_pDragItem[i].fsControl         = 0;
 580         m_pDragItem[i].fsSupportedOps    = DO_COPYABLE | DO_MOVEABLE | DO_LINKABLE;
 581         m_pDragItem[i].hstrSourceName    = ::DrgAddStrHandle(pzBuffer);
 582         m_pDragItem[i].hstrTargetName    = m_pDragItem[i].hstrSourceName;
 583         m_pDragItem[i].ulItemID          = i;
 584         ::DrgSetDragitem( m_pDragInfo
 585                          ,&m_pDragItem[i]
 586                          ,sizeof(DRAGITEM)
 587                          ,0
 588                         );
 589     }
 590     delete [] pzBuffer;
 591     delete [] m_pDragItem;
 592 } // end of wxDropSource::Init
 593
 594 #endif //wxUSE_DRAG_AND_DROP