X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/5fde6fcc9b551340a194ae4c726db5ab64b5c594..2fd4848088e36e84fbf7ed643ef919485583a8f2:/src/mac/carbon/dnd.cpp

diff --git a/src/mac/carbon/dnd.cpp b/src/mac/carbon/dnd.cpp
index ece56ce7d3..22ced39ede 100644
--- a/src/mac/carbon/dnd.cpp
+++ b/src/mac/carbon/dnd.cpp
@@ -1,11 +1,11 @@
 ///////////////////////////////////////////////////////////////////////////////
 // Name:        dnd.cpp
 // Purpose:     wxDropTarget, wxDropSource, wxDataObject implementation
-// Author:      AUTHOR
+// Author:      Stefan Csomor
 // Modified by:
-// Created:     ??/??/98
+// Created:     1998-01-01
 // RCS-ID:      $Id$
-// Copyright:   (c) 1998 AUTHOR
+// Copyright:   (c) 1998 Stefan Csomor
 // Licence:     wxWindows licence
 ///////////////////////////////////////////////////////////////////////////////
 
@@ -13,88 +13,227 @@
 #pragma implementation "dnd.h"
 #endif
 
+#include "wx/defs.h"
+
+#if wxUSE_DRAG_AND_DROP
+
 #include "wx/dnd.h"
 #include "wx/window.h"
+#include "wx/toplevel.h"
 #include "wx/app.h"
 #include "wx/gdicmn.h"
-
-#if wxUSE_DRAG_AND_DROP
+#include "wx/mac/private.h"
 
 // ----------------------------------------------------------------------------
 // global
 // ----------------------------------------------------------------------------
 
-// ----------------------------------------------------------------------------
-// wxDropTarget
-// ----------------------------------------------------------------------------
-
-wxDropTarget::wxDropTarget()
-{
-};
+void wxMacEnsureTrackingHandlersInstalled() ;
 
-wxDropTarget::~wxDropTarget()
+typedef struct 
 {
-};
+    wxWindow* m_currentTargetWindow ;
+    wxDropTarget* m_currentTarget ;
+    wxDropSource* m_currentSource ;
+} MacTrackingGlobals ;
 
-// ----------------------------------------------------------------------------
-// wxTextDropTarget
-// ----------------------------------------------------------------------------
-#ifndef __WXMAC_X__
-bool wxTextDropTarget::OnDrop( wxCoord x, wxCoord y, const void *pData )
-{
-  OnDropText( x, y, (const char*)pData );
-  return TRUE;
-};
-#endif
+MacTrackingGlobals gTrackingGlobals ; 
 
-bool wxTextDropTarget::OnDropText( wxCoord x, wxCoord y, const wxString &psz )
-{
-  printf( "Got dropped text: %s.\n", (char *)psz );
-  printf( "At x: %d, y: %d.\n", (int)x, (int)y );
-  return TRUE;
-};
+//----------------------------------------------------------------------------
+// wxDropTarget
+//----------------------------------------------------------------------------
 
-#ifndef __WXMAC_X__
-size_t wxTextDropTarget::GetFormatCount() const
+wxDropTarget::wxDropTarget( wxDataObject *data )
+            : wxDropTargetBase( data )
 {
-  return 1;
+    wxMacEnsureTrackingHandlersInstalled() ;
 }
 
-wxDataFormat wxTextDropTarget::GetFormat(size_t WXUNUSED(n)) const
+wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
+                                       wxCoord WXUNUSED(y),
+                                       wxDragResult def )
 {
-  return wxDF_TEXT;
-}
-#endif
 
-// ----------------------------------------------------------------------------
-// wxFileDropTarget
-// ----------------------------------------------------------------------------
+    return CurrentDragHasSupportedFormat() ? def : wxDragNone;
+}
 
-#ifndef __WXMAC_X__
-bool wxFileDropTarget::OnDropFiles( wxCoord x, wxCoord y, size_t nFiles, const char * const WXUNUSED(aszFiles)[] )
+bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 {
-  printf( "Got %d dropped files.\n", (int)nFiles );
-  printf( "At x: %d, y: %d.\n", (int)x, (int)y );
-  return TRUE;
+    if (!m_dataObject)
+        return FALSE;
+
+    return CurrentDragHasSupportedFormat() ;
 }
-#endif
 
-bool wxFileDropTarget::OnDrop(wxCoord x, wxCoord y, const wxArrayString& filenames)
+wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
+                                   wxDragResult def )
 {
-  return OnDropFiles(x, y, 1, &filenames); 
+    if (!m_dataObject)
+        return wxDragNone;
+
+    if (!CurrentDragHasSupportedFormat())
+        return wxDragNone;
+
+    return GetData() ? def : wxDragNone;
 }
 
-#ifndef __WXMAC_X__
-size_t wxFileDropTarget::GetFormatCount() const
+bool wxDropTarget::CurrentDragHasSupportedFormat() 
 {
-  return 1;
+    bool supported = false ;
+    if ( gTrackingGlobals.m_currentSource != NULL )
+    {
+        wxDataObject* data = gTrackingGlobals.m_currentSource->GetDataObject() ;
+        
+        if ( data )
+        {
+            size_t formatcount = data->GetFormatCount() ;
+            wxDataFormat *array = new wxDataFormat[ formatcount  ];
+            data->GetAllFormats( array );
+            for (size_t i = 0; !supported && i < formatcount ; i++)
+            {
+                wxDataFormat format = array[i] ;
+                if ( m_dataObject->IsSupported( format ) ) 
+                {
+                    supported = true ;
+                    break ;
+                }
+            }
+            delete[] array ;
+        }
+    }
+    if ( !supported )
+    {
+        UInt16 items ;
+        OSErr result;
+        CountDragItems((DragReference)m_currentDrag, &items);
+        for (UInt16 index = 1; index <= items && supported == false ; ++index) 
+        {
+            ItemReference theItem;
+            FlavorType theType ;
+            UInt16 flavors = 0 ;
+            GetDragItemReferenceNumber((DragReference)m_currentDrag, index, &theItem);
+            CountDragItemFlavors( (DragReference)m_currentDrag, theItem , &flavors ) ;
+            for ( UInt16 flavor = 1 ; flavor <= flavors ; ++flavor )
+            {
+                result = GetFlavorType((DragReference)m_currentDrag, theItem, flavor , &theType);
+                if ( m_dataObject->IsSupportedFormat( wxDataFormat( theType ) ) )
+                {
+                    supported = true ;
+                    break ;
+                }
+            }
+        }
+    }
+    return supported ;   
 }
 
-wxDataFormat wxFileDropTarget::GetFormat(size_t WXUNUSED(n)) const
+bool wxDropTarget::GetData()
 {
-  return wxDF_FILENAME;
+    if (!m_dataObject)
+        return FALSE;
+    
+    if ( !CurrentDragHasSupportedFormat() )
+        return FALSE ;
+    
+    bool transferred = false ;   
+    if ( gTrackingGlobals.m_currentSource != NULL )
+    {
+        wxDataObject* data = gTrackingGlobals.m_currentSource->GetDataObject() ;
+        
+        if ( data )
+        {
+            size_t formatcount = data->GetFormatCount() ;
+            wxDataFormat *array = new wxDataFormat[ formatcount  ];
+            data->GetAllFormats( array );
+            for (size_t i = 0; !transferred && i < formatcount ; i++)
+            {
+                wxDataFormat format = array[i] ;
+                if ( m_dataObject->IsSupported( format ) ) 
+                {
+                    int size = data->GetDataSize( format );
+                    transferred = true ;
+                    
+                    if (size == 0) 
+                    {
+                        m_dataObject->SetData(format , 0 , 0 ) ;
+                    }
+                    else
+                    {
+                        char *d = new char[size];
+                        data->GetDataHere( format , (void*) d );
+                        m_dataObject->SetData( format , size , d ) ;
+                        delete[] d ;
+                    }
+                }
+            }
+            delete[] array ;
+        }
+    }
+    if ( !transferred )
+    {
+        UInt16 items ;
+        OSErr result;
+        bool firstFileAdded = false ;
+        CountDragItems((DragReference)m_currentDrag, &items);
+        for (UInt16 index = 1; index <= items; ++index) 
+        {
+            ItemReference theItem;
+            FlavorType theType ;
+            UInt16 flavors = 0 ;
+            GetDragItemReferenceNumber((DragReference)m_currentDrag, index, &theItem);
+            CountDragItemFlavors( (DragReference)m_currentDrag, theItem , &flavors ) ;
+            for ( UInt16 flavor = 1 ; flavor <= flavors ; ++flavor )
+            {
+                result = GetFlavorType((DragReference)m_currentDrag, theItem, flavor , &theType);
+                wxDataFormat format(theType) ;
+                if ( m_dataObject->IsSupportedFormat( format ) )
+                {
+                    FlavorFlags theFlags;
+                    result = GetFlavorFlags((DragReference)m_currentDrag, theItem, theType, &theFlags);
+                    if (result == noErr) 
+                    {
+                        Size dataSize ;
+                        Ptr theData ;
+                        GetFlavorDataSize((DragReference)m_currentDrag, theItem, theType, &dataSize);
+                        if ( theType == 'TEXT' )
+                        {
+                            // this increment is only valid for allocating, on the next GetFlavorData
+                            // call it is reset again to the original value
+                            dataSize++ ;
+                        }
+                        theData = new char[dataSize];
+                        GetFlavorData((DragReference)m_currentDrag, theItem, theType, (void*) theData, &dataSize, 0L); 
+                        if( theType == 'TEXT' )
+                        {
+                            theData[dataSize]=0 ; 
+                            wxString convert( theData , wxConvLocal ) ;    
+                            m_dataObject->SetData( format, convert.Length() * sizeof(wxChar), (const wxChar*) convert );
+                        }
+                        else if ( theType == kDragFlavorTypeHFS )
+                        {
+                            HFSFlavor* theFile = (HFSFlavor*) theData ;
+                            wxString name = wxMacFSSpec2MacFilename( &theFile->fileSpec ) ;
+                            if (  firstFileAdded )
+                                ((wxFileDataObject*)m_dataObject)->AddFile( name ) ;
+                            else
+                            {
+                                ((wxFileDataObject*)m_dataObject)->SetData( 0 , name.c_str() ) ;
+                                firstFileAdded = true ;    
+                            }
+                        }
+                        else
+                        {
+                            m_dataObject->SetData( format, dataSize, theData );
+                        }
+                        delete[] theData;
+                    }
+                    break ;
+                }
+            }
+        }
+    }
+    return TRUE ;   
 }
-#endif
 
 //-------------------------------------------------------------------------
 // wxDropSource
@@ -103,39 +242,366 @@ wxDataFormat wxFileDropTarget::GetFormat(size_t WXUNUSED(n)) const
 //-----------------------------------------------------------------------------
 // drag request
 
-wxDropSource::wxDropSource( wxWindow *win )
+wxDropSource::wxDropSource(wxWindow *win,
+                           const wxCursor &cursorCopy,
+                           const wxCursor &cursorMove,
+                           const wxCursor &cursorStop)
+            : wxDropSourceBase(cursorCopy, cursorMove, cursorStop)
 {
-    // TODO
-  //    m_window = win;
-    m_data = NULL;
+    wxMacEnsureTrackingHandlersInstalled() ;
+    m_window = win;
+}
 
-    //    m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
-    //    m_goaheadCursor = wxCursor( wxCURSOR_HAND );
-};
+wxDropSource::wxDropSource(wxDataObject& data,
+                           wxWindow *win,
+                           const wxCursor &cursorCopy,
+                           const wxCursor &cursorMove,
+                           const wxCursor &cursorStop)
+            : wxDropSourceBase(cursorCopy, cursorMove, cursorStop)
+{
+    wxMacEnsureTrackingHandlersInstalled() ;
+    SetData( data );
+    m_window = win;
+}
 
-wxDropSource::wxDropSource( wxDataObject &data, wxWindow *win )
+wxDropSource::~wxDropSource()
 {
-    // TODO
-  //    m_window = win;
-    m_data = &data;
+}
 
-    //    m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
-    //    m_goaheadCursor = wxCursor( wxCURSOR_HAND );
-};
 
-void wxDropSource::SetData( wxDataObject &data )
+wxDragResult wxDropSource::DoDragDrop(int WXUNUSED(flags))
 {
-    m_data = &data;
-};
+    wxASSERT_MSG( m_data, wxT("Drop source: no data") );
+    
+    if (!m_data)
+        return (wxDragResult) wxDragNone;
+    
+    if (m_data->GetFormatCount() == 0)
+        return (wxDragResult) wxDragNone;
+    
+    OSErr result;
+    DragReference theDrag;
+    RgnHandle dragRegion;
+    if ((result = NewDrag(&theDrag)))
+    {
+        return wxDragNone ;
+    }
+    // add data to drag
+    size_t formatCount = m_data->GetFormatCount() ;
+    wxDataFormat *formats = new wxDataFormat[formatCount] ;
+    m_data->GetAllFormats( formats ) ;
+    ItemReference theItem = 1 ;
+    for ( size_t i = 0 ; i < formatCount ; ++i )
+    {
+        size_t dataSize = m_data->GetDataSize( formats[i] ) ;
+        Ptr dataPtr = new char[dataSize] ;
+        m_data->GetDataHere( formats[i] , dataPtr ) ;
+        OSType type = formats[i].GetFormatId() ;
+        if ( type == 'TEXT' )
+        {
+            dataSize-- ;
+            dataPtr[ dataSize ] = 0 ;
+            wxString st( (wxChar*) dataPtr ) ;
+            wxCharBuffer buf = st.mb_str( wxConvLocal) ;
+            AddDragItemFlavor(theDrag, theItem, type , buf.data(), strlen(buf), 0);
+        }
+        else if (type == kDragFlavorTypeHFS )
+        {
+            HFSFlavor  theFlavor ;
+            OSErr err = noErr;
+            CInfoPBRec cat;
+            
+            wxMacFilename2FSSpec( dataPtr , &theFlavor.fileSpec ) ;
+            
+            cat.hFileInfo.ioNamePtr = theFlavor.fileSpec.name;
+            cat.hFileInfo.ioVRefNum = theFlavor.fileSpec.vRefNum;
+            cat.hFileInfo.ioDirID = theFlavor.fileSpec.parID;
+            cat.hFileInfo.ioFDirIndex = 0;
+            err = PBGetCatInfoSync(&cat);
+            if (err == noErr )
+            {
+                theFlavor.fdFlags = cat.hFileInfo.ioFlFndrInfo.fdFlags;
+                if (theFlavor.fileSpec.parID == fsRtParID) {
+                    theFlavor.fileCreator = 'MACS';
+                    theFlavor.fileType = 'disk';
+                } else if ((cat.hFileInfo.ioFlAttrib & ioDirMask) != 0) {
+                    theFlavor.fileCreator = 'MACS';
+                    theFlavor.fileType = 'fold';
+                } else {
+                    theFlavor.fileCreator = cat.hFileInfo.ioFlFndrInfo.fdCreator;
+                    theFlavor.fileType = cat.hFileInfo.ioFlFndrInfo.fdType;
+                }
+                AddDragItemFlavor(theDrag, theItem, type , &theFlavor, sizeof(theFlavor), 0);  
+            }    
+        }
+        else
+        {
+            AddDragItemFlavor(theDrag, theItem, type , dataPtr, dataSize, 0);      
+        }
+        delete[] dataPtr ;
+    }
+    delete[] formats ;
+    
+    dragRegion = NewRgn();
+    RgnHandle tempRgn = NewRgn() ;
+    
+    EventRecord* ev = NULL ;
+#if !TARGET_CARBON // TODO
+    ev = (EventRecord*) wxTheApp->MacGetCurrentEvent() ;
+#else
+    EventRecord rec ;
+    ev = &rec ;
+    wxMacConvertEventToRecord( (EventRef) wxTheApp->MacGetCurrentEvent() , &rec ) ;
+#endif
+    const short dragRegionOuterBoundary = 10 ;
+    const short dragRegionInnerBoundary = 9 ;
+    
+    SetRectRgn( dragRegion , ev->where.h - dragRegionOuterBoundary , 
+        ev->where.v  - dragRegionOuterBoundary ,
+        ev->where.h + dragRegionOuterBoundary , 
+        ev->where.v + dragRegionOuterBoundary ) ;
+    
+    SetRectRgn( tempRgn , ev->where.h - dragRegionInnerBoundary , 
+        ev->where.v  - dragRegionInnerBoundary ,
+        ev->where.h + dragRegionInnerBoundary , 
+        ev->where.v + dragRegionInnerBoundary ) ;
+    
+    DiffRgn( dragRegion , tempRgn , dragRegion ) ;
+    DisposeRgn( tempRgn ) ;    
+    
+    // TODO:work with promises in order to return data only when drag
+    // was successfully completed
+    
+    gTrackingGlobals.m_currentSource = this ;
+    result = TrackDrag(theDrag, ev , dragRegion);
+    DisposeRgn(dragRegion);
+    DisposeDrag(theDrag);
+    gTrackingGlobals.m_currentSource = NULL ;
+    
+    KeyMap keymap;
+    GetKeys(keymap);
+    bool optionDown = keymap[1] & 4;
+    wxDragResult dndresult = optionDown ? wxDragCopy : wxDragMove;
+    return dndresult;
+}
 
-wxDropSource::~wxDropSource(void)
+bool wxDropSource::MacInstallDefaultCursor(wxDragResult effect)
 {
-};
-   
-wxDragResult wxDropSource::DoDragDrop( bool WXUNUSED(bAllowMove) )
+    const wxCursor& cursor = GetCursor(effect);
+    if ( cursor.Ok() )
+    {
+        cursor.MacInstall() ;
+
+        return TRUE;
+    }
+    else
+    {
+        return FALSE;
+    }
+}
+
+bool gTrackingGlobalsInstalled = false ;
+
+// passing the globals via refcon is not needed by the CFM and later architectures anymore
+// but I'll leave it in there, just in case...
+
+pascal OSErr wxMacWindowDragTrackingHandler(DragTrackingMessage theMessage, WindowPtr theWindow,
+  void *handlerRefCon, DragReference theDrag) ;
+pascal OSErr wxMacWindowDragReceiveHandler(WindowPtr theWindow, void *handlerRefCon,
+DragReference theDrag) ;
+
+void wxMacEnsureTrackingHandlersInstalled()
 {
-    // TODO
-    return wxDragError;
-};
+    if( !gTrackingGlobalsInstalled )
+    {
+        OSErr result;
+
+        result = InstallTrackingHandler(NewDragTrackingHandlerUPP(wxMacWindowDragTrackingHandler), 0L,&gTrackingGlobals);
+        wxASSERT( result == noErr ) ;
+        result = InstallReceiveHandler(NewDragReceiveHandlerUPP(wxMacWindowDragReceiveHandler), 0L, &gTrackingGlobals);
+        wxASSERT( result == noErr ) ;
 
+        gTrackingGlobalsInstalled = true ;
+    }
+}
+
+pascal OSErr wxMacWindowDragTrackingHandler(DragTrackingMessage theMessage, WindowPtr theWindow,
+  void *handlerRefCon, DragReference theDrag)
+{ 
+    MacTrackingGlobals* trackingGlobals = (MacTrackingGlobals*) handlerRefCon;
+    Point mouse, localMouse;
+    DragAttributes attributes;
+    GetDragAttributes(theDrag, &attributes);
+    wxTopLevelWindowMac* toplevel = wxFindWinFromMacWindow( theWindow ) ; 
+
+    KeyMap keymap;
+    GetKeys(keymap);
+    bool optionDown = keymap[1] & 4;
+    wxDragResult result = optionDown ? wxDragCopy : wxDragMove;
+
+    switch(theMessage) 
+    {
+        case kDragTrackingEnterHandler:
+            break;
+        case kDragTrackingLeaveHandler:
+            break;
+        case kDragTrackingEnterWindow:
+            trackingGlobals->m_currentTargetWindow = NULL ;
+            trackingGlobals->m_currentTarget = NULL ;
+            break;
+        case kDragTrackingInWindow:
+            if (toplevel == NULL)
+                break;
+
+            GetDragMouse(theDrag, &mouse, 0L);
+            localMouse = mouse;
+            GlobalToLocal(&localMouse);
+
+
+            
+//            if (attributes & kDragHasLeftSenderWindow) 
+            {
+                wxPoint point(localMouse.h , localMouse.v) ;
+                wxWindow *win = NULL ;
+                toplevel->MacGetWindowFromPointSub( point , &win ) ;
+                int localx , localy ;
+                localx = localMouse.h ;
+                localy = localMouse.v ;
+                //TODO : should we use client coordinates
+                if ( win )
+                    win->MacRootWindowToWindow( &localx , &localy ) ;
+                if ( win != trackingGlobals->m_currentTargetWindow )
+                {
+                    if ( trackingGlobals->m_currentTargetWindow )
+                    {
+                        // this window is left
+                        if ( trackingGlobals->m_currentTarget )
+                        {
+                            HideDragHilite(theDrag);
+                            trackingGlobals->m_currentTarget->SetCurrentDrag( theDrag ) ;
+                            trackingGlobals->m_currentTarget->OnLeave() ;
+                            trackingGlobals->m_currentTarget = NULL;
+                            trackingGlobals->m_currentTargetWindow = NULL ;
+                        }
+                    }
+                    if ( win )
+                    {
+                        // this window is entered
+                        trackingGlobals->m_currentTargetWindow = win ;
+                        trackingGlobals->m_currentTarget = win->GetDropTarget() ;
+                        {
+
+                        	if ( trackingGlobals->m_currentTarget )
+                        	{
+                            	trackingGlobals->m_currentTarget->SetCurrentDrag( theDrag ) ;
+                            	result = trackingGlobals->m_currentTarget->OnEnter(
+                                	localx , localy , result ) ;
+                            }
+                                
+                           
+                            if ( result != wxDragNone )
+                            {
+                                int x , y ;
+                                x = y = 0 ;
+                                win->MacWindowToRootWindow( &x , &y ) ;
+                                RgnHandle hiliteRgn = NewRgn() ;
+                                SetRectRgn( hiliteRgn , x , y , x+win->GetSize().x ,y+win->GetSize().y) ;
+                                ShowDragHilite(theDrag, hiliteRgn, true);
+                                DisposeRgn( hiliteRgn ) ;
+                            }
+                        }
+                    }
+                }
+                else
+                {
+                    if( trackingGlobals->m_currentTarget )
+                    {
+                        trackingGlobals->m_currentTarget->SetCurrentDrag( theDrag ) ;
+                        trackingGlobals->m_currentTarget->OnDragOver(
+                            localx , localy , result ) ;
+                    }
+                }
+
+                // set cursor for OnEnter and OnDragOver
+                if ( trackingGlobals->m_currentSource && trackingGlobals->m_currentSource->GiveFeedback( result ) == FALSE )
+                {
+                  if ( trackingGlobals->m_currentSource->MacInstallDefaultCursor( result ) == FALSE )
+                  {
+                      switch( result )
+                      {
+                          case wxDragCopy :
+                              {
+                                  wxCursor cursor(wxCURSOR_COPY_ARROW) ;
+                                  cursor.MacInstall() ;
+                              }
+                              break ;
+                          case wxDragMove :
+                              {
+                                  wxCursor cursor(wxCURSOR_ARROW) ;
+                                  cursor.MacInstall() ;
+                              }
+                              break ;
+                          case wxDragNone :
+                              {
+                                  wxCursor cursor(wxCURSOR_NO_ENTRY) ;
+                                  cursor.MacInstall() ;
+                              }
+                              break ;
+
+                          case wxDragError:
+                          case wxDragLink:
+                          case wxDragCancel:
+                              // put these here to make gcc happy
+                              ;
+                      }
+                  }
+                }
+                
+          }
+            // MyTrackItemUnderMouse(localMouse, theWindow);
+            break;
+        case kDragTrackingLeaveWindow:
+            if (trackingGlobals->m_currentTarget) 
+            {
+                trackingGlobals->m_currentTarget->SetCurrentDrag( theDrag ) ;
+                trackingGlobals->m_currentTarget->OnLeave() ;
+                HideDragHilite(theDrag);
+                trackingGlobals->m_currentTarget = NULL ;
+            }
+            trackingGlobals->m_currentTargetWindow = NULL ;
+            break;
+    }
+    return(noErr);
+}
+
+pascal OSErr wxMacWindowDragReceiveHandler(WindowPtr theWindow,
+                                           void *handlerRefCon,
+                                           DragReference theDrag)
+{ 
+    MacTrackingGlobals* trackingGlobals = (MacTrackingGlobals*) handlerRefCon;
+    if ( trackingGlobals->m_currentTarget )
+    {
+        Point mouse,localMouse ;
+        int localx,localy ;
+        
+        trackingGlobals->m_currentTarget->SetCurrentDrag( theDrag ) ;
+        GetDragMouse(theDrag, &mouse, 0L);
+        localMouse = mouse;
+        GlobalToLocal(&localMouse);
+        localx = localMouse.h ;
+        localy = localMouse.v ;
+        //TODO : should we use client coordinates
+        if ( trackingGlobals->m_currentTargetWindow )
+            trackingGlobals->m_currentTargetWindow->MacRootWindowToWindow( &localx , &localy ) ;
+        if ( trackingGlobals->m_currentTarget->OnDrop( localx , localy ) )
+        {
+            KeyMap keymap;
+            GetKeys(keymap);
+            bool optionDown = keymap[1] & 4;
+            wxDragResult result = optionDown ? wxDragCopy : wxDragMove;
+            trackingGlobals->m_currentTarget->OnData( localx , localy , result ) ;
+        }
+    }
+    return(noErr);
+}
 #endif