src/mac/carbon/dnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        dnd.cpp
   3 // Purpose:     wxDropTarget, wxDropSource, wxDataObject implementation
   4 // Author:      AUTHOR
   5 // Modified by:
   6 // Created:     ??/??/98
   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/defs.h"
  17
  18 #if wxUSE_DRAG_AND_DROP
  19
  20 #include "wx/dnd.h"
  21 #include "wx/window.h"
  22 #include "wx/toplevel.h"
  23 #include "wx/app.h"
  24 #include "wx/gdicmn.h"
  25 #include "wx/mac/private.h"
  26
  27 // ----------------------------------------------------------------------------
  28 // global
  29 // ----------------------------------------------------------------------------
  30
  31 void wxMacEnsureTrackingHandlersInstalled() ;
  32
  33 typedef struct
  34 {
  35     wxWindow* m_currentTargetWindow ;
  36     wxDropTarget* m_currentTarget ;
  37     wxDropSource* m_currentSource ;
  38 } MacTrackingGlobals ;
  39
  40 MacTrackingGlobals gTrackingGlobals ;
  41
  42 //----------------------------------------------------------------------------
  43 // wxDropTarget
  44 //----------------------------------------------------------------------------
  45
  46 wxDropTarget::wxDropTarget( wxDataObject *data )
  47             : wxDropTargetBase( data )
  48 {
  49     wxMacEnsureTrackingHandlersInstalled() ;
  50 }
  51
  52 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
  53                                        wxCoord WXUNUSED(y),
  54                                        wxDragResult def )
  55 {
  56
  57     return CurrentDragHasSupportedFormat() ? def : wxDragNone;
  58 }
  59
  60 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
  61 {
  62     if (!m_dataObject)
  63         return FALSE;
  64
  65     return CurrentDragHasSupportedFormat() ;
  66 }
  67
  68 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
  69                                    wxDragResult def )
  70 {
  71     if (!m_dataObject)
  72         return wxDragNone;
  73
  74     if (!CurrentDragHasSupportedFormat())
  75         return wxDragNone;
  76
  77     return GetData() ? def : wxDragNone;
  78 }
  79
  80 bool wxDropTarget::CurrentDragHasSupportedFormat()
  81 {
  82     bool supported = false ;
  83     if ( gTrackingGlobals.m_currentSource != NULL )
  84     {
  85       wxDataObject* data = gTrackingGlobals.m_currentSource->GetDataObject() ;
  86
  87       if ( data )
  88       {
  89         size_t formatcount = data->GetFormatCount() ;
  90         wxDataFormat *array = new wxDataFormat[ formatcount  ];
  91         data->GetAllFormats( array );
  92         for (size_t i = 0; !supported && i < formatcount ; i++)
  93         {
  94             wxDataFormat format = array[i] ;
  95             if ( m_dataObject->IsSupported( format ) )
  96             {
  97               supported = true ;
  98               break ;
  99             }
 100         }
 101         delete[] array ;
 102       }
 103     }
 104     if ( !supported )
 105     {
 106       UInt16 items ;
 107       OSErr result;
 108       CountDragItems((DragReference)m_currentDrag, &items);
 109       for (UInt16 index = 1; index <= items && supported == false ; ++index)
 110       {
 111           ItemReference theItem;
 112           FlavorType theType ;
 113           UInt16 flavors = 0 ;
 114           GetDragItemReferenceNumber((DragReference)m_currentDrag, index, &theItem);
 115           CountDragItemFlavors( (DragReference)m_currentDrag, theItem , &flavors ) ;
 116           for ( UInt16 flavor = 1 ; flavor <= flavors ; ++flavor )
 117           {
 118             result = GetFlavorType((DragReference)m_currentDrag, theItem, flavor , &theType);
 119             if ( m_dataObject->IsSupportedFormat( wxDataFormat( theType ) ) )
 120             {
 121               supported = true ;
 122               break ;
 123             }
 124           }
 125       }
 126     }
 127     return supported ;
 128 }
 129
 130 bool wxDropTarget::GetData()
 131 {
 132     if (!m_dataObject)
 133         return FALSE;
 134
 135     if ( !CurrentDragHasSupportedFormat() )
 136         return FALSE ;
 137
 138     bool transferred = false ;
 139     if ( gTrackingGlobals.m_currentSource != NULL )
 140     {
 141       wxDataObject* data = gTrackingGlobals.m_currentSource->GetDataObject() ;
 142
 143       if ( data )
 144       {
 145         size_t formatcount = data->GetFormatCount() ;
 146         wxDataFormat *array = new wxDataFormat[ formatcount  ];
 147         data->GetAllFormats( array );
 148         for (size_t i = 0; !transferred && i < formatcount ; i++)
 149         {
 150             wxDataFormat format = array[i] ;
 151             if ( m_dataObject->IsSupported( format ) )
 152             {
 153               int size = data->GetDataSize( format );
 154               transferred = true ;
 155
 156               if (size == 0)
 157               {
 158                 m_dataObject->SetData(format , 0 , 0 ) ;
 159               }
 160               else
 161               {
 162                 char *d = new char[size];
 163                 data->GetDataHere( format , (void*) d );
 164                 m_dataObject->SetData( format , size , d ) ;
 165                 delete[] d ;
 166               }
 167             }
 168          }
 169         delete[] array ;
 170       }
 171     }
 172     if ( !transferred )
 173     {
 174       UInt16 items ;
 175       OSErr result;
 176       bool firstFileAdded = false ;
 177       CountDragItems((DragReference)m_currentDrag, &items);
 178       for (UInt16 index = 1; index <= items; ++index)
 179       {
 180           ItemReference theItem;
 181           FlavorType theType ;
 182           UInt16 flavors = 0 ;
 183           GetDragItemReferenceNumber((DragReference)m_currentDrag, index, &theItem);
 184           CountDragItemFlavors( (DragReference)m_currentDrag, theItem , &flavors ) ;
 185           for ( UInt16 flavor = 1 ; flavor <= flavors ; ++flavor )
 186           {
 187             result = GetFlavorType((DragReference)m_currentDrag, theItem, flavor , &theType);
 188             wxDataFormat format(theType) ;
 189             if ( m_dataObject->IsSupportedFormat( format ) )
 190             {
 191               FlavorFlags theFlags;
 192               result = GetFlavorFlags((DragReference)m_currentDrag, theItem, theType, &theFlags);
 193               if (result == noErr)
 194               {
 195                   Size dataSize ;
 196                   Ptr theData ;
 197                   GetFlavorDataSize((DragReference)m_currentDrag, theItem, theType, &dataSize);
 198                           if ( theType == 'TEXT' )
 199                           {
 200                                 // this increment is only valid for allocating, on the next GetFlavorData
 201                                 // call it is reset again to the original value
 202                             dataSize++ ;
 203                           }
 204                   theData = new char[dataSize];
 205                   GetFlavorData((DragReference)m_currentDrag, theItem, theType, (void*) theData, &dataSize, 0L);
 206                   if( theType == 'TEXT' )
 207                   {
 208                     theData[dataSize]=0 ;
 209                     if ( wxApp::s_macDefaultEncodingIsPC )
 210                     {
 211                       wxMacConvertToPC((char*)theData,(char*)theData,dataSize) ;
 212                     }
 213                     m_dataObject->SetData( format, dataSize, theData );
 214                   }
 215                   else if ( theType == kDragFlavorTypeHFS )
 216                   {
 217                     HFSFlavor* theFile = (HFSFlavor*) theData ;
 218                     wxString name = wxMacFSSpec2MacFilename( &theFile->fileSpec ) ;
 219                     if (  firstFileAdded )
 220                         ((wxFileDataObject*)m_dataObject)->AddFile( name ) ;
 221                     else
 222                     {
 223                         ((wxFileDataObject*)m_dataObject)->SetData( 0 , name.c_str() ) ;
 224                         firstFileAdded = true ;
 225                     }
 226                   }
 227                   else
 228                   {
 229                     m_dataObject->SetData( format, dataSize, theData );
 230                   }
 231                   delete[] theData;
 232               }
 233               break ;
 234             }
 235           }
 236       }
 237     }
 238     return TRUE ;
 239 }
 240
 241 //-------------------------------------------------------------------------
 242 // wxDropSource
 243 //-------------------------------------------------------------------------
 244
 245 //-----------------------------------------------------------------------------
 246 // drag request
 247
 248 wxDropSource::wxDropSource(wxWindow *win,
 249                            const wxIcon &iconCopy,
 250                            const wxIcon &iconMove,
 251                            const wxIcon &iconNone)
 252 {
 253     wxMacEnsureTrackingHandlersInstalled() ;
 254     m_window = win;
 255 }
 256
 257 wxDropSource::wxDropSource(wxDataObject& data,
 258                            wxWindow *win,
 259                            const wxIcon &iconCopy,
 260                            const wxIcon &iconMove,
 261                            const wxIcon &iconNone)
 262 {
 263     wxMacEnsureTrackingHandlersInstalled() ;
 264     SetData( data );
 265     m_window = win;
 266 }
 267
 268 wxDropSource::~wxDropSource()
 269 {
 270 }
 271
 272
 273 wxDragResult wxDropSource::DoDragDrop(int WXUNUSED(flags))
 274 {
 275     wxASSERT_MSG( m_data, wxT("Drop source: no data") );
 276
 277     if (!m_data)
 278         return (wxDragResult) wxDragNone;
 279
 280     if (m_data->GetFormatCount() == 0)
 281         return (wxDragResult) wxDragNone;
 282
 283     OSErr result;
 284     DragReference theDrag;
 285     RgnHandle dragRegion;
 286     if ((result = NewDrag(&theDrag)))
 287     {
 288         return wxDragNone ;
 289     }
 290     // add data to drag
 291     size_t formatCount = m_data->GetFormatCount() ;
 292     wxDataFormat *formats = new wxDataFormat[formatCount] ;
 293     m_data->GetAllFormats( formats ) ;
 294     ItemReference theItem = 1 ;
 295     for ( size_t i = 0 ; i < formatCount ; ++i )
 296     {
 297         size_t dataSize = m_data->GetDataSize( formats[i] ) ;
 298         Ptr dataPtr = new char[dataSize] ;
 299         m_data->GetDataHere( formats[i] , dataPtr ) ;
 300         OSType type = formats[i].GetFormatId() ;
 301         if ( type == 'TEXT' )
 302         {
 303           dataSize-- ;
 304           if ( wxApp::s_macDefaultEncodingIsPC )
 305           {
 306             wxMacConvertFromPC((char*)dataPtr,(char*)dataPtr,dataSize) ;
 307           }
 308           AddDragItemFlavor(theDrag, theItem, type , dataPtr, dataSize, 0);
 309         }
 310         else if (type == kDragFlavorTypeHFS )
 311         {
 312           HFSFlavor  theFlavor ;
 313                 OSErr err = noErr;
 314                 CInfoPBRec cat;
 315
 316           wxMacFilename2FSSpec( dataPtr , &theFlavor.fileSpec ) ;
 317
 318                 cat.hFileInfo.ioNamePtr = theFlavor.fileSpec.name;
 319                 cat.hFileInfo.ioVRefNum = theFlavor.fileSpec.vRefNum;
 320                 cat.hFileInfo.ioDirID = theFlavor.fileSpec.parID;
 321                 cat.hFileInfo.ioFDirIndex = 0;
 322                 err = PBGetCatInfoSync(&cat);
 323                 if (err == noErr )
 324                 {
 325                 theFlavor.fdFlags = cat.hFileInfo.ioFlFndrInfo.fdFlags;
 326                 if (theFlavor.fileSpec.parID == fsRtParID) {
 327                         theFlavor.fileCreator = 'MACS';
 328                         theFlavor.fileType = 'disk';
 329                 } else if ((cat.hFileInfo.ioFlAttrib & ioDirMask) != 0) {
 330                         theFlavor.fileCreator = 'MACS';
 331                         theFlavor.fileType = 'fold';
 332                 } else {
 333                         theFlavor.fileCreator = cat.hFileInfo.ioFlFndrInfo.fdCreator;
 334                         theFlavor.fileType = cat.hFileInfo.ioFlFndrInfo.fdType;
 335                 }
 336             AddDragItemFlavor(theDrag, theItem, type , &theFlavor, sizeof(theFlavor), 0);
 337           }
 338         }
 339         else
 340         {
 341           AddDragItemFlavor(theDrag, theItem, type , dataPtr, dataSize, 0);
 342         }
 343         delete[] dataPtr ;
 344     }
 345     delete[] formats ;
 346
 347     dragRegion = NewRgn();
 348     RgnHandle tempRgn = NewRgn() ;
 349
 350     EventRecord* ev = NULL ;
 351 #if !TARGET_CARBON // TODO
 352         ev = (EventRecord*) wxTheApp->MacGetCurrentEvent() ;
 353 #else
 354         EventRecord rec ;
 355         ev = &rec ;
 356         wxMacConvertEventToRecord( (EventRef) wxTheApp->MacGetCurrentEvent() , &rec ) ;
 357 #endif
 358     const short dragRegionOuterBoundary = 10 ;
 359     const short dragRegionInnerBoundary = 9 ;
 360
 361     SetRectRgn( dragRegion , ev->where.h - dragRegionOuterBoundary ,
 362       ev->where.v  - dragRegionOuterBoundary ,
 363       ev->where.h + dragRegionOuterBoundary ,
 364       ev->where.v + dragRegionOuterBoundary ) ;
 365
 366     SetRectRgn( tempRgn , ev->where.h - dragRegionInnerBoundary ,
 367       ev->where.v  - dragRegionInnerBoundary ,
 368       ev->where.h + dragRegionInnerBoundary ,
 369       ev->where.v + dragRegionInnerBoundary ) ;
 370
 371     DiffRgn( dragRegion , tempRgn , dragRegion ) ;
 372     DisposeRgn( tempRgn ) ;
 373
 374     // TODO:work with promises in order to return data only when drag
 375     // was successfully completed
 376
 377     gTrackingGlobals.m_currentSource = this ;
 378     result = TrackDrag(theDrag, ev , dragRegion);
 379     DisposeRgn(dragRegion);
 380     DisposeDrag(theDrag);
 381     gTrackingGlobals.m_currentSource = NULL ;
 382
 383     return wxDragCopy ;
 384 }
 385
 386 bool gTrackingGlobalsInstalled = false ;
 387
 388 // passing the globals via refcon is not needed by the CFM and later architectures anymore
 389 // but I'll leave it in there, just in case...
 390
 391 pascal OSErr wxMacWindowDragTrackingHandler(DragTrackingMessage theMessage, WindowPtr theWindow,
 392   void *handlerRefCon, DragReference theDrag) ;
 393 pascal OSErr wxMacWindowDragReceiveHandler(WindowPtr theWindow, void *handlerRefCon,
 394 DragReference theDrag) ;
 395
 396 void wxMacEnsureTrackingHandlersInstalled()
 397 {
 398     if( !gTrackingGlobalsInstalled )
 399     {
 400         OSErr result;
 401
 402         result = InstallTrackingHandler(NewDragTrackingHandlerUPP(wxMacWindowDragTrackingHandler), 0L,&gTrackingGlobals);
 403         wxASSERT( result == noErr ) ;
 404         result = InstallReceiveHandler(NewDragReceiveHandlerUPP(wxMacWindowDragReceiveHandler), 0L, &gTrackingGlobals);
 405         wxASSERT( result == noErr ) ;
 406
 407         gTrackingGlobalsInstalled = true ;
 408     }
 409 }
 410
 411 pascal OSErr wxMacWindowDragTrackingHandler(DragTrackingMessage theMessage, WindowPtr theWindow,
 412   void *handlerRefCon, DragReference theDrag)
 413 {
 414     MacTrackingGlobals* trackingGlobals = (MacTrackingGlobals*) handlerRefCon;
 415     Point mouse, localMouse;
 416     DragAttributes attributes;
 417     GetDragAttributes(theDrag, &attributes);
 418     wxTopLevelWindowMac* toplevel = wxFindWinFromMacWindow( theWindow ) ;
 419     switch(theMessage)
 420     {
 421         case kDragTrackingEnterHandler:
 422             break;
 423         case kDragTrackingLeaveHandler:
 424             break;
 425         case kDragTrackingEnterWindow:
 426            trackingGlobals->m_currentTargetWindow = NULL ;
 427             trackingGlobals->m_currentTarget = NULL ;
 428             break;
 429         case kDragTrackingInWindow:
 430             if (toplevel == NULL)
 431                 break;
 432
 433             GetDragMouse(theDrag, &mouse, 0L);
 434             localMouse = mouse;
 435             GlobalToLocal(&localMouse);
 436
 437 //            if (attributes & kDragHasLeftSenderWindow)
 438             {
 439                 wxPoint point(localMouse.h , localMouse.v) ;
 440                 wxWindow *win = NULL ;
 441                 toplevel->MacGetWindowFromPointSub( point , &win ) ;
 442                 int localx , localy ;
 443                 localx = localMouse.h ;
 444                 localy = localMouse.v ;
 445                 //TODO : should we use client coordinates
 446                 if ( win )
 447                     win->MacRootWindowToWindow( &localx , &localy ) ;
 448                 if ( win != trackingGlobals->m_currentTargetWindow )
 449                 {
 450                     if ( trackingGlobals->m_currentTargetWindow )
 451                     {
 452                         // this window is left
 453                         if ( trackingGlobals->m_currentTarget )
 454                         {
 455                             HideDragHilite(theDrag);
 456                             trackingGlobals->m_currentTarget->SetCurrentDrag( theDrag ) ;
 457                             trackingGlobals->m_currentTarget->OnLeave() ;
 458                             trackingGlobals->m_currentTarget = NULL;
 459                             trackingGlobals->m_currentTargetWindow = NULL ;
 460                         }
 461                     }
 462                     if ( win )
 463                     {
 464                         // this window is entered
 465                         trackingGlobals->m_currentTargetWindow = win ;
 466                         trackingGlobals->m_currentTarget = win->GetDropTarget() ;
 467                         if ( trackingGlobals->m_currentTarget )
 468                         {
 469                           trackingGlobals->m_currentTarget->SetCurrentDrag( theDrag ) ;
 470                            if ( trackingGlobals->m_currentTarget->OnEnter(
 471                                 localx , localy , wxDragCopy ) != wxDragNone )
 472                             {
 473                               int x , y ;
 474                               x = y = 0 ;
 475                               win->MacWindowToRootWindow( &x , &y ) ;
 476                               RgnHandle hiliteRgn = NewRgn() ;
 477                               SetRectRgn( hiliteRgn , x , y , x+win->GetSize().x ,y+win->GetSize().y) ;
 478                               ShowDragHilite(theDrag, hiliteRgn, true);
 479                               DisposeRgn( hiliteRgn ) ;
 480                             }
 481                         }
 482                     }
 483                 }
 484                 else
 485                 {
 486                     if( trackingGlobals->m_currentTarget )
 487                     {
 488                         trackingGlobals->m_currentTarget->SetCurrentDrag( theDrag ) ;
 489                         trackingGlobals->m_currentTarget->OnDragOver(
 490                             localx , localy , wxDragCopy ) ;
 491                     }
 492                 }
 493
 494           }
 495             // MyTrackItemUnderMouse(localMouse, theWindow);
 496             break;
 497         case kDragTrackingLeaveWindow:
 498             if (trackingGlobals->m_currentTarget)
 499             {
 500                 trackingGlobals->m_currentTarget->SetCurrentDrag( theDrag ) ;
 501                 trackingGlobals->m_currentTarget->OnLeave() ;
 502                 HideDragHilite(theDrag);
 503                 trackingGlobals->m_currentTarget = NULL ;
 504             }
 505             trackingGlobals->m_currentTargetWindow = NULL ;
 506             break;
 507     }
 508     return(noErr);
 509 }
 510
 511 pascal OSErr wxMacWindowDragReceiveHandler(WindowPtr theWindow,
 512                                            void *handlerRefCon,
 513                                            DragReference theDrag)
 514 {
 515     MacTrackingGlobals* trackingGlobals = (MacTrackingGlobals*) handlerRefCon;
 516     if ( trackingGlobals->m_currentTarget )
 517     {
 518         Point mouse,localMouse ;
 519         int localx,localy ;
 520
 521         trackingGlobals->m_currentTarget->SetCurrentDrag( theDrag ) ;
 522         GetDragMouse(theDrag, &mouse, 0L);
 523         localMouse = mouse;
 524         GlobalToLocal(&localMouse);
 525         localx = localMouse.h ;
 526         localy = localMouse.v ;
 527         //TODO : should we use client coordinates
 528         if ( trackingGlobals->m_currentTargetWindow )
 529             trackingGlobals->m_currentTargetWindow->MacRootWindowToWindow( &localx , &localy ) ;
 530         if ( trackingGlobals->m_currentTarget->OnDrop( localx , localy ) )
 531         {
 532             trackingGlobals->m_currentTarget->OnData( localx , localy , wxDragCopy ) ;
 533         }
 534     }
 535     return(noErr);
 536 }
 537 #endif