src/mac/carbon/dnd.cpp

///////////////////////////////////////////////////////////////////////////////
// Name:        src/mac/carbon/dnd.cpp
// Purpose:     wxDropTarget, wxDropSource implementations
// Author:      Stefan Csomor
// Modified by:
// Created:     1998-01-01
// RCS-ID:      $Id$
// Copyright:   (c) 1998 Stefan Csomor
// Licence:     wxWindows licence
///////////////////////////////////////////////////////////////////////////////

#include "wx/wxprec.h"

#if wxUSE_DRAG_AND_DROP

#include "wx/dnd.h"

#ifndef WX_PRECOMP
    #include "wx/app.h"
    #include "wx/toplevel.h"
    #include "wx/gdicmn.h"
#endif // WX_PRECOMP

#include "wx/mac/private.h"

// ----------------------------------------------------------------------------
// globals
// ----------------------------------------------------------------------------

typedef struct
{
    wxWindow *m_currentTargetWindow;
    wxDropTarget *m_currentTarget;
    wxDropSource *m_currentSource;
    wxDragResult m_result;
    int m_flags;
} MacTrackingGlobals;

MacTrackingGlobals gTrackingGlobals;

void wxMacEnsureTrackingHandlersInstalled();

//----------------------------------------------------------------------------
// wxDropTarget
//----------------------------------------------------------------------------

wxDropTarget::wxDropTarget( wxDataObject *data )
            : wxDropTargetBase( data )
{
    wxMacEnsureTrackingHandlersInstalled();
}

wxDragResult wxDropTarget::OnDragOver(
    wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
    wxDragResult def )
{
    return CurrentDragHasSupportedFormat() ? def : wxDragNone;
}

bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
{
    if (m_dataObject == NULL)
        return false;

    return CurrentDragHasSupportedFormat();
}

wxDragResult wxDropTarget::OnData(
    wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
    wxDragResult def )
{
    if (m_dataObject == NULL)
        return wxDragNone;

    if (!CurrentDragHasSupportedFormat())
        return wxDragNone;

    return GetData() ? def : wxDragNone;
}

bool wxDropTarget::CurrentDragHasSupportedFormat()
{
    bool supported = false;
    if (m_dataObject == NULL)
        return 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 )
    {
        PasteboardRef   pasteboard;

        if ( GetDragPasteboard( (DragReference)m_currentDrag, &pasteboard ) == noErr )
        {
            supported = m_dataObject->HasDataInPasteboard( pasteboard );
        }
    }

    return supported;
}

bool wxDropTarget::GetData()
{
    if (m_dataObject == NULL)
        return false;

    if ( !CurrentDragHasSupportedFormat() )
        return false;

    bool transferred = false;
    if ( gTrackingGlobals.m_currentSource != NULL )
    {
        wxDataObject* data = gTrackingGlobals.m_currentSource->GetDataObject();

        if (data != NULL)
        {
            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 )
    {
        PasteboardRef   pasteboard;

        if ( GetDragPasteboard(  (DragReference)m_currentDrag, &pasteboard ) == noErr )
        {
            transferred = m_dataObject->GetFromPasteboard( pasteboard );
        }
    }

    return transferred;
}

//-------------------------------------------------------------------------
// wxDropSource
//-------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// drag request

wxDropSource::wxDropSource(wxWindow *win,
                           const wxCursor &cursorCopy,
                           const wxCursor &cursorMove,
                           const wxCursor &cursorStop)
            : wxDropSourceBase(cursorCopy, cursorMove, cursorStop)
{
    wxMacEnsureTrackingHandlersInstalled();

    m_window = win;
}

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()
{
}

OSStatus wxMacPromiseKeeper(PasteboardRef WXUNUSED(inPasteboard),
                            PasteboardItemID WXUNUSED(inItem),
                            CFStringRef WXUNUSED(inFlavorType),
                            void * WXUNUSED(inContext))
{
    OSStatus  err = noErr;

    // we might add promises here later, inContext is the wxDropSource*

    return err;
}

wxDragResult wxDropSource::DoDragDrop(int flags)
{
    wxASSERT_MSG( m_data, wxT("Drop source: no data") );

    if ((m_data == NULL) || (m_data->GetFormatCount() == 0))
        return (wxDragResult)wxDragNone;

    DragReference theDrag;
    RgnHandle dragRegion;
    OSStatus err = noErr;
    PasteboardRef   pasteboard;

    // add data to drag

    err = PasteboardCreate( kPasteboardUniqueName, &pasteboard );
    if ( err != noErr )
        return wxDragNone;

    // we add a dummy promise keeper because of strange messages when linking against carbon debug
    err = PasteboardSetPromiseKeeper( pasteboard, wxMacPromiseKeeper, this );
    if ( err != noErr )
    {
        CFRelease( pasteboard );
        return wxDragNone;
    }

    err = PasteboardClear( pasteboard );
    if ( err != noErr )
    {
        CFRelease( pasteboard );
        return wxDragNone;
    }
    PasteboardSynchronize( pasteboard );

    m_data->AddToPasteboard( pasteboard, 1 );

    if (NewDragWithPasteboard( pasteboard , &theDrag) != noErr)
    {
        CFRelease( pasteboard );
        return wxDragNone;
    }

    dragRegion = NewRgn();
    RgnHandle tempRgn = NewRgn();

    EventRecord rec;
    ConvertEventRefToEventRecord(  (EventRef) wxTheApp->MacGetCurrentEvent(), &rec );

    const short dragRegionOuterBoundary = 10;
    const short dragRegionInnerBoundary = 9;

    SetRectRgn(
        dragRegion,
        rec.where.h - dragRegionOuterBoundary,
        rec.where.v  - dragRegionOuterBoundary,
        rec.where.h + dragRegionOuterBoundary,
        rec.where.v + dragRegionOuterBoundary );

    SetRectRgn(
        tempRgn,
        rec.where.h - dragRegionInnerBoundary,
        rec.where.v - dragRegionInnerBoundary,
        rec.where.h + dragRegionInnerBoundary,
        rec.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;
    gTrackingGlobals.m_result = wxDragNone;
    gTrackingGlobals.m_flags = flags;

    err = TrackDrag( theDrag, &rec, dragRegion );

    DisposeRgn( dragRegion );
    DisposeDrag( theDrag );
    CFRelease( pasteboard );
    gTrackingGlobals.m_currentSource = NULL;

    return gTrackingGlobals.m_result;
}

bool wxDropSource::MacInstallDefaultCursor(wxDragResult effect)
{
    const wxCursor& cursor = GetCursor(effect);
    bool result = cursor.Ok();

    if ( result )
        cursor.MacInstall();

    return result;
}

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()
{
    if ( !gTrackingGlobalsInstalled )
    {
        OSStatus err;

        err = InstallTrackingHandler( NewDragTrackingHandlerUPP(wxMacWindowDragTrackingHandler), 0L, &gTrackingGlobals );
        verify_noerr( err );

        err = InstallReceiveHandler( NewDragReceiveHandlerUPP(wxMacWindowDragReceiveHandler), 0L, &gTrackingGlobals );
        verify_noerr( err );

        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 );

    bool optionDown = GetCurrentKeyModifiers() & optionKey;
    wxDragResult result = optionDown ? wxDragCopy : wxDragMove;

    switch (theMessage)
    {
        case kDragTrackingEnterHandler:
        case kDragTrackingLeaveHandler:
            break;

        case kDragTrackingEnterWindow:
            if (trackingGlobals != NULL)
            {
                trackingGlobals->m_currentTargetWindow = NULL;
                trackingGlobals->m_currentTarget = NULL;
            }
            break;

        case kDragTrackingInWindow:
            if (trackingGlobals == NULL)
                break;
            if (toplevel == NULL)
                break;

            GetDragMouse( theDrag, &mouse, 0L );
            localMouse = mouse;
            wxMacGlobalToLocal( theWindow, &localMouse );

            {
                wxWindow *win = NULL;
                ControlPartCode controlPart;
                ControlRef control = FindControlUnderMouse( localMouse, theWindow, &controlPart );
                if ( control )
                    win = wxFindControlFromMacControl( control );
                else
                    win = toplevel;

                int localx, localy;
                localx = localMouse.h;
                localy = localMouse.v;

                if ( win )
                    win->MacRootWindowToWindow( &localx, &localy );
                if ( win != trackingGlobals->m_currentTargetWindow )
                {
                    if ( trackingGlobals->m_currentTargetWindow )
                    {
                        // this window is left
                        if ( trackingGlobals->m_currentTarget )
                        {
#ifndef __LP64__
                            HideDragHilite( theDrag );
#endif
                            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();
                                Rect r = { y, x, y + win->GetSize().y, x + win->GetSize().x };
                                RectRgn( hiliteRgn, &r );
#ifndef __LP64__
                                ShowDragHilite( theDrag, hiliteRgn, true );
#endif
                                DisposeRgn( hiliteRgn );
                            }
                        }
                    }
                }
                else
                {
                    if ( trackingGlobals->m_currentTarget )
                    {
                        trackingGlobals->m_currentTarget->SetCurrentDrag( theDrag );
                        result = trackingGlobals->m_currentTarget->OnDragOver( localx, localy, result );
                    }
                }

                // set cursor for OnEnter and OnDragOver
                if ( trackingGlobals->m_currentSource && !trackingGlobals->m_currentSource->GiveFeedback( result ) )
                {
                  if ( !trackingGlobals->m_currentSource->MacInstallDefaultCursor( result ) )
                  {
                      int cursorID = wxCURSOR_NONE;

                      switch (result)
                      {
                          case wxDragCopy:
                              cursorID = wxCURSOR_COPY_ARROW;
                              break;

                          case wxDragMove:
                              cursorID = wxCURSOR_ARROW;
                              break;

                          case wxDragNone:
                              cursorID = wxCURSOR_NO_ENTRY;
                              break;

                          case wxDragError:
                          case wxDragLink:
                          case wxDragCancel:
                          default:
                              // put these here to make gcc happy
                              ;
                      }

                      if (cursorID != wxCURSOR_NONE)
                      {
                          wxCursor cursor( cursorID );
                          cursor.MacInstall();
                      }
                   }
                }
            }
            break;

        case kDragTrackingLeaveWindow:
            if (trackingGlobals == NULL)
                break;

            if (trackingGlobals->m_currentTarget)
            {
                trackingGlobals->m_currentTarget->SetCurrentDrag( theDrag );
                trackingGlobals->m_currentTarget->OnLeave();
#ifndef __LP64__
                HideDragHilite( theDrag );
#endif
                trackingGlobals->m_currentTarget = NULL;
            }
            trackingGlobals->m_currentTargetWindow = NULL;
            break;

        default:
            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;
        wxMacGlobalToLocal( theWindow, &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 ) )
        {
            // the option key indicates copy in Mac UI, if it's not pressed do
            // move by default if it's allowed at all
            wxDragResult
                result = !(trackingGlobals->m_flags & wxDrag_AllowMove) ||
                            (GetCurrentKeyModifiers() & optionKey)
                            ? wxDragCopy
                            : wxDragMove;
            trackingGlobals->m_result =
                trackingGlobals->m_currentTarget->OnData( localx, localy, result );
        }
    }

    return noErr;
}

#endif // wxUSE_DRAG_AND_DROP
Commit	Line	Data
	1	///////////////////////////////////////////////////////////////////////////////
	2	// Name: src/mac/carbon/dnd.cpp
	3	// Purpose: wxDropTarget, wxDropSource implementations
	4	// Author: Stefan Csomor
	5	// Modified by:
	6	// Created: 1998-01-01
	7	// RCS-ID: $Id$
	8	// Copyright: (c) 1998 Stefan Csomor
	9	// Licence: wxWindows licence
	10	///////////////////////////////////////////////////////////////////////////////
	11
	12	#include "wx/wxprec.h"
	13
	14	#if wxUSE_DRAG_AND_DROP
	15
	16	#include "wx/dnd.h"
	17
	18	#ifndef WX_PRECOMP
	19	#include "wx/app.h"
	20	#include "wx/toplevel.h"
	21	#include "wx/gdicmn.h"
	22	#endif // WX_PRECOMP
	23
	24	#include "wx/mac/private.h"
	25
	26	// ----------------------------------------------------------------------------
	27	// globals
	28	// ----------------------------------------------------------------------------
	29
	30	typedef struct
	31	{
	32	wxWindow *m_currentTargetWindow;
	33	wxDropTarget *m_currentTarget;
	34	wxDropSource *m_currentSource;
	35	wxDragResult m_result;
	36	int m_flags;
	37	} MacTrackingGlobals;
	38
	39	MacTrackingGlobals gTrackingGlobals;
	40
	41	void wxMacEnsureTrackingHandlersInstalled();
	42
	43	//----------------------------------------------------------------------------
	44	// wxDropTarget
	45	//----------------------------------------------------------------------------
	46
	47	wxDropTarget::wxDropTarget( wxDataObject *data )
	48	: wxDropTargetBase( data )
	49	{
	50	wxMacEnsureTrackingHandlersInstalled();
	51	}
	52
	53	wxDragResult wxDropTarget::OnDragOver(
	54	wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
	55	wxDragResult def )
	56	{
	57	return CurrentDragHasSupportedFormat() ? def : wxDragNone;
	58	}
	59
	60	bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
	61	{
	62	if (m_dataObject == NULL)
	63	return false;
	64
	65	return CurrentDragHasSupportedFormat();
	66	}
	67
	68	wxDragResult wxDropTarget::OnData(
	69	wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
	70	wxDragResult def )
	71	{
	72	if (m_dataObject == NULL)
	73	return wxDragNone;
	74
	75	if (!CurrentDragHasSupportedFormat())
	76	return wxDragNone;
	77
	78	return GetData() ? def : wxDragNone;
	79	}
	80
	81	bool wxDropTarget::CurrentDragHasSupportedFormat()
	82	{
	83	bool supported = false;
	84	if (m_dataObject == NULL)
	85	return false;
	86
	87	if ( gTrackingGlobals.m_currentSource != NULL )
	88	{
	89	wxDataObject* data = gTrackingGlobals.m_currentSource->GetDataObject();
	90
	91	if ( data )
	92	{
	93	size_t formatcount = data->GetFormatCount();
	94	wxDataFormat *array = new wxDataFormat[formatcount];
	95	data->GetAllFormats( array );
	96	for (size_t i = 0; !supported && i < formatcount; i++)
	97	{
	98	wxDataFormat format = array[i];
	99	if ( m_dataObject->IsSupported( format ) )
	100	{
	101	supported = true;
	102	break;
	103	}
	104	}
	105
	106	delete [] array;
	107	}
	108	}
	109
	110	if ( !supported )
	111	{
	112	PasteboardRef pasteboard;
	113
	114	if ( GetDragPasteboard( (DragReference)m_currentDrag, &pasteboard ) == noErr )
	115	{
	116	supported = m_dataObject->HasDataInPasteboard( pasteboard );
	117	}
	118	}
	119
	120	return supported;
	121	}
	122
	123	bool wxDropTarget::GetData()
	124	{
	125	if (m_dataObject == NULL)
	126	return false;
	127
	128	if ( !CurrentDragHasSupportedFormat() )
	129	return false;
	130
	131	bool transferred = false;
	132	if ( gTrackingGlobals.m_currentSource != NULL )
	133	{
	134	wxDataObject* data = gTrackingGlobals.m_currentSource->GetDataObject();
	135
	136	if (data != NULL)
	137	{
	138	size_t formatcount = data->GetFormatCount();
	139	wxDataFormat *array = new wxDataFormat[formatcount];
	140	data->GetAllFormats( array );
	141	for (size_t i = 0; !transferred && i < formatcount; i++)
	142	{
	143	wxDataFormat format = array[i];
	144	if ( m_dataObject->IsSupported( format ) )
	145	{
	146	int size = data->GetDataSize( format );
	147	transferred = true;
	148
	149	if (size == 0)
	150	{
	151	m_dataObject->SetData( format, 0, 0 );
	152	}
	153	else
	154	{
	155	char *d = new char[size];
	156	data->GetDataHere( format, (void*)d );
	157	m_dataObject->SetData( format, size, d );
	158	delete [] d;
	159	}
	160	}
	161	}
	162
	163	delete [] array;
	164	}
	165	}
	166
	167	if ( !transferred )
	168	{
	169	PasteboardRef pasteboard;
	170
	171	if ( GetDragPasteboard( (DragReference)m_currentDrag, &pasteboard ) == noErr )
	172	{
	173	transferred = m_dataObject->GetFromPasteboard( pasteboard );
	174	}
	175	}
	176
	177	return transferred;
	178	}
	179
	180	//-------------------------------------------------------------------------
	181	// wxDropSource
	182	//-------------------------------------------------------------------------
	183
	184	//-----------------------------------------------------------------------------
	185	// drag request
	186
	187	wxDropSource::wxDropSource(wxWindow *win,
	188	const wxCursor &cursorCopy,
	189	const wxCursor &cursorMove,
	190	const wxCursor &cursorStop)
	191	: wxDropSourceBase(cursorCopy, cursorMove, cursorStop)
	192	{
	193	wxMacEnsureTrackingHandlersInstalled();
	194
	195	m_window = win;
	196	}
	197
	198	wxDropSource::wxDropSource(wxDataObject& data,
	199	wxWindow *win,
	200	const wxCursor &cursorCopy,
	201	const wxCursor &cursorMove,
	202	const wxCursor &cursorStop)
	203	: wxDropSourceBase(cursorCopy, cursorMove, cursorStop)
	204	{
	205	wxMacEnsureTrackingHandlersInstalled();
	206
	207	SetData( data );
	208	m_window = win;
	209	}
	210
	211	wxDropSource::~wxDropSource()
	212	{
	213	}
	214
	215	OSStatus wxMacPromiseKeeper(PasteboardRef WXUNUSED(inPasteboard),
	216	PasteboardItemID WXUNUSED(inItem),
	217	CFStringRef WXUNUSED(inFlavorType),
	218	void * WXUNUSED(inContext))
	219	{
	220	OSStatus err = noErr;
	221
	222	// we might add promises here later, inContext is the wxDropSource*
	223
	224	return err;
	225	}
	226
	227	wxDragResult wxDropSource::DoDragDrop(int flags)
	228	{
	229	wxASSERT_MSG( m_data, wxT("Drop source: no data") );
	230
	231	if ((m_data == NULL) \|\| (m_data->GetFormatCount() == 0))
	232	return (wxDragResult)wxDragNone;
	233
	234	DragReference theDrag;
	235	RgnHandle dragRegion;
	236	OSStatus err = noErr;
	237	PasteboardRef pasteboard;
	238
	239	// add data to drag
	240
	241	err = PasteboardCreate( kPasteboardUniqueName, &pasteboard );
	242	if ( err != noErr )
	243	return wxDragNone;
	244
	245	// we add a dummy promise keeper because of strange messages when linking against carbon debug
	246	err = PasteboardSetPromiseKeeper( pasteboard, wxMacPromiseKeeper, this );
	247	if ( err != noErr )
	248	{
	249	CFRelease( pasteboard );
	250	return wxDragNone;
	251	}
	252
	253	err = PasteboardClear( pasteboard );
	254	if ( err != noErr )
	255	{
	256	CFRelease( pasteboard );
	257	return wxDragNone;
	258	}
	259	PasteboardSynchronize( pasteboard );
	260
	261	m_data->AddToPasteboard( pasteboard, 1 );
	262
	263	if (NewDragWithPasteboard( pasteboard , &theDrag) != noErr)
	264	{
	265	CFRelease( pasteboard );
	266	return wxDragNone;
	267	}
	268
	269	dragRegion = NewRgn();
	270	RgnHandle tempRgn = NewRgn();
	271
	272	EventRecord rec;
	273	ConvertEventRefToEventRecord( (EventRef) wxTheApp->MacGetCurrentEvent(), &rec );
	274
	275	const short dragRegionOuterBoundary = 10;
	276	const short dragRegionInnerBoundary = 9;
	277
	278	SetRectRgn(
	279	dragRegion,
	280	rec.where.h - dragRegionOuterBoundary,
	281	rec.where.v - dragRegionOuterBoundary,
	282	rec.where.h + dragRegionOuterBoundary,
	283	rec.where.v + dragRegionOuterBoundary );
	284
	285	SetRectRgn(
	286	tempRgn,
	287	rec.where.h - dragRegionInnerBoundary,
	288	rec.where.v - dragRegionInnerBoundary,
	289	rec.where.h + dragRegionInnerBoundary,
	290	rec.where.v + dragRegionInnerBoundary );
	291
	292	DiffRgn( dragRegion, tempRgn, dragRegion );
	293	DisposeRgn( tempRgn );
	294
	295	// TODO: work with promises in order to return data
	296	// only when drag was successfully completed
	297
	298	gTrackingGlobals.m_currentSource = this;
	299	gTrackingGlobals.m_result = wxDragNone;
	300	gTrackingGlobals.m_flags = flags;
	301
	302	err = TrackDrag( theDrag, &rec, dragRegion );
	303
	304	DisposeRgn( dragRegion );
	305	DisposeDrag( theDrag );
	306	CFRelease( pasteboard );
	307	gTrackingGlobals.m_currentSource = NULL;
	308
	309	return gTrackingGlobals.m_result;
	310	}
	311
	312	bool wxDropSource::MacInstallDefaultCursor(wxDragResult effect)
	313	{
	314	const wxCursor& cursor = GetCursor(effect);
	315	bool result = cursor.Ok();
	316
	317	if ( result )
	318	cursor.MacInstall();
	319
	320	return result;
	321	}
	322
	323	bool gTrackingGlobalsInstalled = false;
	324
	325	// passing the globals via refcon is not needed by the CFM and later architectures anymore
	326	// but I'll leave it in there, just in case...
	327
	328	pascal OSErr wxMacWindowDragTrackingHandler(
	329	DragTrackingMessage theMessage, WindowPtr theWindow,
	330	void *handlerRefCon, DragReference theDrag );
	331	pascal OSErr wxMacWindowDragReceiveHandler(
	332	WindowPtr theWindow, void *handlerRefCon,
	333	DragReference theDrag );
	334
	335	void wxMacEnsureTrackingHandlersInstalled()
	336	{
	337	if ( !gTrackingGlobalsInstalled )
	338	{
	339	OSStatus err;
	340
	341	err = InstallTrackingHandler( NewDragTrackingHandlerUPP(wxMacWindowDragTrackingHandler), 0L, &gTrackingGlobals );
	342	verify_noerr( err );
	343
	344	err = InstallReceiveHandler( NewDragReceiveHandlerUPP(wxMacWindowDragReceiveHandler), 0L, &gTrackingGlobals );
	345	verify_noerr( err );
	346
	347	gTrackingGlobalsInstalled = true;
	348	}
	349	}
	350
	351	pascal OSErr wxMacWindowDragTrackingHandler(
	352	DragTrackingMessage theMessage, WindowPtr theWindow,
	353	void *handlerRefCon, DragReference theDrag )
	354	{
	355	MacTrackingGlobals* trackingGlobals = (MacTrackingGlobals*) handlerRefCon;
	356
	357	Point mouse, localMouse;
	358	DragAttributes attributes;
	359
	360	GetDragAttributes( theDrag, &attributes );
	361
	362	wxTopLevelWindowMac* toplevel = wxFindWinFromMacWindow( theWindow );
	363
	364	bool optionDown = GetCurrentKeyModifiers() & optionKey;
	365	wxDragResult result = optionDown ? wxDragCopy : wxDragMove;
	366
	367	switch (theMessage)
	368	{
	369	case kDragTrackingEnterHandler:
	370	case kDragTrackingLeaveHandler:
	371	break;
	372
	373	case kDragTrackingEnterWindow:
	374	if (trackingGlobals != NULL)
	375	{
	376	trackingGlobals->m_currentTargetWindow = NULL;
	377	trackingGlobals->m_currentTarget = NULL;
	378	}
	379	break;
	380
	381	case kDragTrackingInWindow:
	382	if (trackingGlobals == NULL)
	383	break;
	384	if (toplevel == NULL)
	385	break;
	386
	387	GetDragMouse( theDrag, &mouse, 0L );
	388	localMouse = mouse;
	389	wxMacGlobalToLocal( theWindow, &localMouse );
	390
	391	{
	392	wxWindow *win = NULL;
	393	ControlPartCode controlPart;
	394	ControlRef control = FindControlUnderMouse( localMouse, theWindow, &controlPart );
	395	if ( control )
	396	win = wxFindControlFromMacControl( control );
	397	else
	398	win = toplevel;
	399
	400	int localx, localy;
	401	localx = localMouse.h;
	402	localy = localMouse.v;
	403
	404	if ( win )
	405	win->MacRootWindowToWindow( &localx, &localy );
	406	if ( win != trackingGlobals->m_currentTargetWindow )
	407	{
	408	if ( trackingGlobals->m_currentTargetWindow )
	409	{
	410	// this window is left
	411	if ( trackingGlobals->m_currentTarget )
	412	{
	413	#ifndef __LP64__
	414	HideDragHilite( theDrag );
	415	#endif
	416	trackingGlobals->m_currentTarget->SetCurrentDrag( theDrag );
	417	trackingGlobals->m_currentTarget->OnLeave();
	418	trackingGlobals->m_currentTarget = NULL;
	419	trackingGlobals->m_currentTargetWindow = NULL;
	420	}
	421	}
	422
	423	if ( win )
	424	{
	425	// this window is entered
	426	trackingGlobals->m_currentTargetWindow = win;
	427	trackingGlobals->m_currentTarget = win->GetDropTarget();
	428	{
	429	if ( trackingGlobals->m_currentTarget )
	430	{
	431	trackingGlobals->m_currentTarget->SetCurrentDrag( theDrag );
	432	result = trackingGlobals->m_currentTarget->OnEnter( localx, localy, result );
	433	}
	434
	435	if ( result != wxDragNone )
	436	{
	437	int x, y;
	438
	439	x = y = 0;
	440	win->MacWindowToRootWindow( &x, &y );
	441	RgnHandle hiliteRgn = NewRgn();
	442	Rect r = { y, x, y + win->GetSize().y, x + win->GetSize().x };
	443	RectRgn( hiliteRgn, &r );
	444	#ifndef __LP64__
	445	ShowDragHilite( theDrag, hiliteRgn, true );
	446	#endif
	447	DisposeRgn( hiliteRgn );
	448	}
	449	}
	450	}
	451	}
	452	else
	453	{
	454	if ( trackingGlobals->m_currentTarget )
	455	{
	456	trackingGlobals->m_currentTarget->SetCurrentDrag( theDrag );
	457	result = trackingGlobals->m_currentTarget->OnDragOver( localx, localy, result );
	458	}
	459	}
	460
	461	// set cursor for OnEnter and OnDragOver
	462	if ( trackingGlobals->m_currentSource && !trackingGlobals->m_currentSource->GiveFeedback( result ) )
	463	{
	464	if ( !trackingGlobals->m_currentSource->MacInstallDefaultCursor( result ) )
	465	{
	466	int cursorID = wxCURSOR_NONE;
	467
	468	switch (result)
	469	{
	470	case wxDragCopy:
	471	cursorID = wxCURSOR_COPY_ARROW;
	472	break;
	473
	474	case wxDragMove:
	475	cursorID = wxCURSOR_ARROW;
	476	break;
	477
	478	case wxDragNone:
	479	cursorID = wxCURSOR_NO_ENTRY;
	480	break;
	481
	482	case wxDragError:
	483	case wxDragLink:
	484	case wxDragCancel:
	485	default:
	486	// put these here to make gcc happy
	487	;
	488	}
	489
	490	if (cursorID != wxCURSOR_NONE)
	491	{
	492	wxCursor cursor( cursorID );
	493	cursor.MacInstall();
	494	}
	495	}
	496	}
	497	}
	498	break;
	499
	500	case kDragTrackingLeaveWindow:
	501	if (trackingGlobals == NULL)
	502	break;
	503
	504	if (trackingGlobals->m_currentTarget)
	505	{
	506	trackingGlobals->m_currentTarget->SetCurrentDrag( theDrag );
	507	trackingGlobals->m_currentTarget->OnLeave();
	508	#ifndef __LP64__
	509	HideDragHilite( theDrag );
	510	#endif
	511	trackingGlobals->m_currentTarget = NULL;
	512	}
	513	trackingGlobals->m_currentTargetWindow = NULL;
	514	break;
	515
	516	default:
	517	break;
	518	}
	519
	520	return noErr;
	521	}
	522
	523	pascal OSErr wxMacWindowDragReceiveHandler(
	524	WindowPtr theWindow,
	525	void *handlerRefCon,
	526	DragReference theDrag)
	527	{
	528	MacTrackingGlobals* trackingGlobals = (MacTrackingGlobals*)handlerRefCon;
	529	if ( trackingGlobals->m_currentTarget )
	530	{
	531	Point mouse, localMouse;
	532	int localx, localy;
	533
	534	trackingGlobals->m_currentTarget->SetCurrentDrag( theDrag );
	535	GetDragMouse( theDrag, &mouse, 0L );
	536	localMouse = mouse;
	537	wxMacGlobalToLocal( theWindow, &localMouse );
	538	localx = localMouse.h;
	539	localy = localMouse.v;
	540
	541	// TODO : should we use client coordinates?
	542	if ( trackingGlobals->m_currentTargetWindow )
	543	trackingGlobals->m_currentTargetWindow->MacRootWindowToWindow( &localx, &localy );
	544	if ( trackingGlobals->m_currentTarget->OnDrop( localx, localy ) )
	545	{
	546	// the option key indicates copy in Mac UI, if it's not pressed do
	547	// move by default if it's allowed at all
	548	wxDragResult
	549	result = !(trackingGlobals->m_flags & wxDrag_AllowMove) \|\|
	550	(GetCurrentKeyModifiers() & optionKey)
	551	? wxDragCopy
	552	: wxDragMove;
	553	trackingGlobals->m_result =
	554	trackingGlobals->m_currentTarget->OnData( localx, localy, result );
	555	}
	556	}
	557
	558	return noErr;
	559	}
	560
	561	#endif // wxUSE_DRAG_AND_DROP
	562