1///////////////////////////////////////////////////////////////////////////////
2// Name:        src/gtk1/dnd.cpp
3// Purpose:     wxDropTarget class
4// Author:      Robert Roebling
5// Id:          $Id: dnd.cpp 43806 2006-12-04 17:11:37Z VZ $
6// Copyright:   (c) 1998 Robert Roebling
7// Licence:     wxWindows licence
8///////////////////////////////////////////////////////////////////////////////
9
10// For compilers that support precompilation, includes "wx.h".
11#include "wx/wxprec.h"
12
13#if wxUSE_DRAG_AND_DROP
14
15#include "wx/dnd.h"
16
17#ifndef WX_PRECOMP
18    #include "wx/intl.h"
19    #include "wx/log.h"
20    #include "wx/app.h"
21    #include "wx/utils.h"
22    #include "wx/window.h"
23    #include "wx/gdicmn.h"
24#endif
25
26#include "wx/gtk1/private.h"
27
28#include <gdk/gdkprivate.h>
29
30#include <gtk/gtkdnd.h>
31#include <gtk/gtkselection.h>
32
33//-----------------------------------------------------------------------------
34// idle system
35//-----------------------------------------------------------------------------
36
37extern void wxapp_install_idle_handler();
38extern bool g_isIdle;
39
40//-----------------------------------------------------------------------------
41// thread system
42//-----------------------------------------------------------------------------
43
44#if wxUSE_THREADS
45#endif
46
47//----------------------------------------------------------------------------
48// global data
49//----------------------------------------------------------------------------
50
51extern bool g_blockEventsOnDrag;
52
53// the flags used for the last DoDragDrop()
54static long gs_flagsForDrag = 0;
55
56// the trace mask we use with wxLogTrace() - call
57// wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
58// (there are quite a few of them, so don't enable this by default)
59#define TRACE_DND _T("dnd")
60
61// global variables because GTK+ DnD want to have the
62// mouse event that caused it
63extern GdkEvent *g_lastMouseEvent;
64extern int g_lastButtonNumber;
65
66//----------------------------------------------------------------------------
67// standard icons
68//----------------------------------------------------------------------------
69
70/* Copyright (c) Julian Smart */
71static const char * page_xpm[] = {
72/* columns rows colors chars-per-pixel */
73"32 32 37 1",
74"5 c #7198D9",
75", c #769CDA",
76"2 c #DCE6F6",
77"i c #FFFFFF",
78"e c #779DDB",
79": c #9AB6E4",
80"9 c #EAF0FA",
81"- c #B1C7EB",
82"$ c #6992D7",
83"y c #F7F9FD",
84"= c #BED0EE",
85"q c #F0F5FC",
86"; c #A8C0E8",
87"@ c #366BC2",
88"  c None",
89"u c #FDFEFF",
90"8 c #5987D3",
91"* c #C4D5F0",
92"7 c #7CA0DC",
93"O c #487BCE",
94"< c #6B94D7",
95"& c #CCDAF2",
96"> c #89A9DF",
97"3 c #5584D1",
98"w c #82A5DE",
99"1 c #3F74CB",
100"+ c #3A70CA",
101". c #3569BF",
102"% c #D2DFF4",
103"# c #3366BB",
104"r c #F5F8FD",
105"0 c #FAFCFE",
106"4 c #DFE8F7",
107"X c #5E8AD4",
108"o c #5282D0",
109"t c #B8CCEC",
110"6 c #E5EDF9",
111/* pixels */
112"                                ",
113"                                ",
114"                                ",
115"                                ",
116"                                ",
117"       .XXXooOO++@#             ",
118"       $%&*=-;::>,<1            ",
119"       $2%&*=-;::><:3           ",
120"       $42%&*=-;::<&:3          ",
121"       56477<<<<8<<9&:X         ",
122"       59642%&*=-;<09&:5        ",
123"       5q9642%&*=-<<<<<#        ",
124"       5qqw777<<<<<88:>+        ",
125"       erqq9642%&*=t;::+        ",
126"       eyrqq9642%&*=t;:O        ",
127"       eyywwww777<<<<t;O        ",
128"       e0yyrqq9642%&*=to        ",
129"       e00yyrqq9642%&*=o        ",
130"       eu0wwwwwww777<&*X        ",
131"       euu00yyrqq9642%&X        ",
132"       eiuu00yyrqq9642%X        ",
133"       eiiwwwwwwwwww742$        ",
134"       eiiiuu00yyrqq964$        ",
135"       eiiiiuu00yyrqq96$        ",
136"       eiiiiiuu00yyrqq95        ",
137"       eiiiiiiuu00yyrqq5        ",
138"       eeeeeeeeeeeeee55e        ",
139"                                ",
140"                                ",
141"                                ",
142"                                ",
143"                                "
144};
145
146
147// ============================================================================
148// private functions
149// ============================================================================
150
151// ----------------------------------------------------------------------------
152// convert between GTK+ and wxWidgets DND constants
153// ----------------------------------------------------------------------------
154
155static wxDragResult ConvertFromGTK(long action)
156{
157    switch ( action )
158    {
159        case GDK_ACTION_COPY:
160            return wxDragCopy;
161
162        case GDK_ACTION_LINK:
163            return wxDragLink;
164
165        case GDK_ACTION_MOVE:
166            return wxDragMove;
167    }
168
169    return wxDragNone;
170}
171
172// ----------------------------------------------------------------------------
173// "drag_leave"
174// ----------------------------------------------------------------------------
175
176extern "C" {
177static void target_drag_leave( GtkWidget *WXUNUSED(widget),
178                               GdkDragContext *context,
179                               guint WXUNUSED(time),
180                               wxDropTarget *drop_target )
181{
182    if (g_isIdle) wxapp_install_idle_handler();
183
184    /* inform the wxDropTarget about the current GdkDragContext.
185       this is only valid for the duration of this call */
186    drop_target->SetDragContext( context );
187
188    /* we don't need return values. this event is just for
189       information */
190    drop_target->OnLeave();
191
192    /* this has to be done because GDK has no "drag_enter" event */
193    drop_target->m_firstMotion = true;
194
195    /* after this, invalidate the drop_target's GdkDragContext */
196    drop_target->SetDragContext( (GdkDragContext*) NULL );
197}
198}
199
200// ----------------------------------------------------------------------------
201// "drag_motion"
202// ----------------------------------------------------------------------------
203
204extern "C" {
205static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
206                                    GdkDragContext *context,
207                                    gint x,
208                                    gint y,
209                                    guint time,
210                                    wxDropTarget *drop_target )
211{
212    if (g_isIdle) wxapp_install_idle_handler();
213
214    /* Owen Taylor: "if the coordinates not in a drop zone,
215       return FALSE, otherwise call gtk_drag_status() and
216       return TRUE" */
217
218    /* inform the wxDropTarget about the current GdkDragContext.
219       this is only valid for the duration of this call */
220    drop_target->SetDragContext( context );
221
222    // GTK+ always supposes that we want to copy the data by default while we
223    // might want to move it, so examine not only suggested_action - which is
224    // only good if we don't have our own preferences - but also the actions
225    // field
226    wxDragResult result;
227    if (drop_target->GetDefaultAction() == wxDragNone)
228    {
229        // use default action set by wxDropSource::DoDragDrop()
230    if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
231            (context->actions & GDK_ACTION_MOVE ) )
232    {
233        // move is requested by the program and allowed by GTK+ - do it, even
234        // though suggested_action may be currently wxDragCopy
235        result = wxDragMove;
236    }
237    else // use whatever GTK+ says we should
238    {
239        result = ConvertFromGTK(context->suggested_action);
240
241        if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
242        {
243            // we're requested to move but we can't
244            result = wxDragCopy;
245        }
246    }
247    }
248    else if (drop_target->GetDefaultAction() == wxDragMove &&
249                (context->actions & GDK_ACTION_MOVE))
250    {
251       result = wxDragMove;
252    }
253    else
254    {
255        if (context->actions & GDK_ACTION_COPY)
256            result = wxDragCopy;
257        else if (context->actions & GDK_ACTION_MOVE)
258            result = wxDragMove;
259        else
260            result = wxDragNone;
261    }
262
263    if (drop_target->m_firstMotion)
264    {
265        /* the first "drag_motion" event substitutes a "drag_enter" event */
266        result = drop_target->OnEnter( x, y, result );
267    }
268    else
269    {
270        /* give program a chance to react (i.e. to say no by returning FALSE) */
271        result = drop_target->OnDragOver( x, y, result );
272    }
273
274    bool ret = wxIsDragResultOk( result );
275    if (ret)
276    {
277        GdkDragAction action;
278        if (result == wxDragCopy)
279            action = GDK_ACTION_COPY;
280        else if (result == wxDragLink)
281            action = GDK_ACTION_LINK;
282        else
283            action = GDK_ACTION_MOVE;
284
285        gdk_drag_status( context, action, time );
286    }
287
288    /* after this, invalidate the drop_target's GdkDragContext */
289    drop_target->SetDragContext( (GdkDragContext*) NULL );
290
291    /* this has to be done because GDK has no "drag_enter" event */
292    drop_target->m_firstMotion = false;
293
294    return ret;
295}
296}
297
298// ----------------------------------------------------------------------------
299// "drag_drop"
300// ----------------------------------------------------------------------------
301
302extern "C" {
303static gboolean target_drag_drop( GtkWidget *widget,
304                                  GdkDragContext *context,
305                                  gint x,
306                                  gint y,
307                                  guint time,
308                                  wxDropTarget *drop_target )
309{
310    if (g_isIdle) wxapp_install_idle_handler();
311
312    /* Owen Taylor: "if the drop is not in a drop zone,
313       return FALSE, otherwise, if you aren't accepting
314       the drop, call gtk_drag_finish() with success == FALSE
315       otherwise call gtk_drag_data_get()" */
316
317//    printf( "drop.\n" );
318
319    /* this seems to make a difference between not accepting
320       due to wrong target area and due to wrong format. let
321       us hope that this is not required.. */
322
323    /* inform the wxDropTarget about the current GdkDragContext.
324       this is only valid for the duration of this call */
325    drop_target->SetDragContext( context );
326
327    /* inform the wxDropTarget about the current drag widget.
328       this is only valid for the duration of this call */
329    drop_target->SetDragWidget( widget );
330
331    /* inform the wxDropTarget about the current drag time.
332       this is only valid for the duration of this call */
333    drop_target->SetDragTime( time );
334
335/*
336    wxDragResult result = wxDragMove;
337    if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
338*/
339
340    /* reset the block here as someone might very well
341       show a dialog as a reaction to a drop and this
342       wouldn't work without events */
343    g_blockEventsOnDrag = false;
344
345    bool ret = drop_target->OnDrop( x, y );
346
347    if (!ret)
348    {
349        wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
350
351        /* cancel the whole thing */
352        gtk_drag_finish( context,
353                          FALSE,        /* no success */
354                          FALSE,        /* don't delete data on dropping side */
355                          time );
356    }
357    else
358    {
359        wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned TRUE") );
360
361#if wxUSE_THREADS
362        /* disable GUI threads */
363#endif
364
365        GdkAtom format = drop_target->GetMatchingPair();
366
367        // this does happen somehow, see bug 555111
368        wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") );
369
370/*
371        GdkDragAction action = GDK_ACTION_MOVE;
372        if (result == wxDragCopy) action == GDK_ACTION_COPY;
373        context->action = action;
374*/
375        /* this should trigger an "drag_data_received" event */
376        gtk_drag_get_data( widget,
377                           context,
378                           format,
379                           time );
380
381#if wxUSE_THREADS
382        /* re-enable GUI threads */
383#endif
384    }
385
386    /* after this, invalidate the drop_target's GdkDragContext */
387    drop_target->SetDragContext( (GdkDragContext*) NULL );
388
389    /* after this, invalidate the drop_target's drag widget */
390    drop_target->SetDragWidget( (GtkWidget*) NULL );
391
392    /* this has to be done because GDK has no "drag_enter" event */
393    drop_target->m_firstMotion = true;
394
395    return ret;
396}
397}
398
399// ----------------------------------------------------------------------------
400// "drag_data_received"
401// ----------------------------------------------------------------------------
402
403extern "C" {
404static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
405                                       GdkDragContext *context,
406                                       gint x,
407                                       gint y,
408                                       GtkSelectionData *data,
409                                       guint WXUNUSED(info),
410                                       guint time,
411                                       wxDropTarget *drop_target )
412{
413    if (g_isIdle) wxapp_install_idle_handler();
414
415    /* Owen Taylor: "call gtk_drag_finish() with
416       success == TRUE" */
417
418    if ((data->length <= 0) || (data->format != 8))
419    {
420        /* negative data length and non 8-bit data format
421           qualifies for junk */
422        gtk_drag_finish (context, FALSE, FALSE, time);
423
424        return;
425    }
426
427    wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
428
429    /* inform the wxDropTarget about the current GtkSelectionData.
430       this is only valid for the duration of this call */
431    drop_target->SetDragData( data );
432
433    wxDragResult result = ConvertFromGTK(context->action);
434
435    if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
436    {
437        wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned TRUE") );
438
439        /* tell GTK that data transfer was successful */
440        gtk_drag_finish( context, TRUE, FALSE, time );
441    }
442    else
443    {
444        wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
445
446        /* tell GTK that data transfer was not successful */
447        gtk_drag_finish( context, FALSE, FALSE, time );
448    }
449
450    /* after this, invalidate the drop_target's drag data */
451    drop_target->SetDragData( (GtkSelectionData*) NULL );
452}
453}
454
455//----------------------------------------------------------------------------
456// wxDropTarget
457//----------------------------------------------------------------------------
458
459wxDropTarget::wxDropTarget( wxDataObject *data )
460            : wxDropTargetBase( data )
461{
462    m_firstMotion = true;
463    m_dragContext = (GdkDragContext*) NULL;
464    m_dragWidget = (GtkWidget*) NULL;
465    m_dragData = (GtkSelectionData*) NULL;
466    m_dragTime = 0;
467}
468
469wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
470                                       wxCoord WXUNUSED(y),
471                                       wxDragResult def )
472{
473    // GetMatchingPair() checks for m_dataObject too, no need to do it here
474
475    // disable the debug message from GetMatchingPair() - there are too many
476    // of them otherwise
477#ifdef __WXDEBUG__
478    wxLogNull noLog;
479#endif // Debug
480
481    return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
482}
483
484bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
485{
486    if (!m_dataObject)
487        return false;
488
489    return (GetMatchingPair() != (GdkAtom) 0);
490}
491
492wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
493                                   wxDragResult def )
494{
495    if (!m_dataObject)
496        return wxDragNone;
497
498    if (GetMatchingPair() == (GdkAtom) 0)
499        return wxDragNone;
500
501    return GetData() ? def : wxDragNone;
502}
503
504GdkAtom wxDropTarget::GetMatchingPair()
505{
506    if (!m_dataObject)
507        return (GdkAtom) 0;
508
509    if (!m_dragContext)
510        return (GdkAtom) 0;
511
512    GList *child = m_dragContext->targets;
513    while (child)
514    {
515        GdkAtom formatAtom = GPOINTER_TO_INT(child->data);
516        wxDataFormat format( formatAtom );
517
518#ifdef __WXDEBUG__
519        wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
520                   format.GetId().c_str());
521#endif // Debug
522
523        if (m_dataObject->IsSupportedFormat( format ))
524            return formatAtom;
525
526        child = child->next;
527    }
528
529    return (GdkAtom) 0;
530}
531
532bool wxDropTarget::GetData()
533{
534    if (!m_dragData)
535        return false;
536
537    if (!m_dataObject)
538        return false;
539
540    wxDataFormat dragFormat( m_dragData->target );
541
542    if (!m_dataObject->IsSupportedFormat( dragFormat ))
543        return false;
544
545    m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
546
547    return true;
548}
549
550void wxDropTarget::UnregisterWidget( GtkWidget *widget )
551{
552    wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
553
554    gtk_drag_dest_unset( widget );
555
556    gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
557                      GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
558
559    gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
560                      GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
561
562    gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
563                      GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
564
565    gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
566                      GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
567}
568
569void wxDropTarget::RegisterWidget( GtkWidget *widget )
570{
571    wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
572
573    /* gtk_drag_dest_set() determines what default behaviour we'd like
574       GTK to supply. we don't want to specify out targets (=formats)
575       or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
576       not GTK_DEST_DEFAULT_DROP). instead we react individually to
577       "drag_motion" and "drag_drop" events. this makes it possible
578       to allow dropping on only a small area. we should set
579       GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
580       highlighting if dragging over standard controls, but this
581       seems to be broken without the other two. */
582
583    gtk_drag_dest_set( widget,
584                       (GtkDestDefaults) 0,         /* no default behaviour */
585                       (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
586                       0,                           /* number of targets = 0 */
587                       (GdkDragAction) 0 );         /* we don't supply any actions here */
588
589    gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
590                      GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
591
592    gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
593                      GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
594
595    gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
596                      GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
597
598    gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
599                      GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
600}
601
602//----------------------------------------------------------------------------
603// "drag_data_get"
604//----------------------------------------------------------------------------
605
606extern "C" {
607static void
608source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
609                       GdkDragContext     *WXUNUSED(context),
610                       GtkSelectionData   *selection_data,
611                       guint               WXUNUSED(info),
612                       guint               WXUNUSED(time),
613                       wxDropSource       *drop_source )
614{
615    if (g_isIdle) wxapp_install_idle_handler();
616
617    wxDataFormat format( selection_data->target );
618
619    wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
620               format.GetId().c_str());
621
622    drop_source->m_retValue = wxDragCancel;
623
624    wxDataObject *data = drop_source->GetDataObject();
625
626    if (!data)
627    {
628        wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
629        return;
630    }
631
632    if (!data->IsSupportedFormat(format))
633    {
634        wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
635        return;
636    }
637
638    if (data->GetDataSize(format) == 0)
639    {
640        wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
641        return;
642    }
643
644    size_t size = data->GetDataSize(format);
645
646//  printf( "data size: %d.\n", (int)data_size );
647
648    guchar *d = new guchar[size];
649
650    if (!data->GetDataHere( format, (void*)d ))
651    {
652        delete[] d;
653        return;
654    }
655
656#if wxUSE_THREADS
657    /* disable GUI threads */
658#endif
659
660    gtk_selection_data_set( selection_data,
661                            selection_data->target,
662                            8,   // 8-bit
663                            d,
664                            size );
665
666#if wxUSE_THREADS
667    /* enable GUI threads */
668#endif
669
670    delete[] d;
671}
672}
673
674//----------------------------------------------------------------------------
675// "drag_data_delete"
676//----------------------------------------------------------------------------
677
678extern "C" {
679static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
680                                     GdkDragContext *context,
681                                     wxDropSource *WXUNUSED(drop_source) )
682{
683    if (g_isIdle)
684        wxapp_install_idle_handler();
685
686    // printf( "Drag source: drag_data_delete\n" );
687}
688}
689
690//----------------------------------------------------------------------------
691// "drag_begin"
692//----------------------------------------------------------------------------
693
694extern "C" {
695static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
696                               GdkDragContext     *WXUNUSED(context),
697                               wxDropSource       *WXUNUSED(drop_source) )
698{
699    if (g_isIdle)
700        wxapp_install_idle_handler();
701
702    // printf( "Drag source: drag_begin.\n" );
703}
704}
705
706//----------------------------------------------------------------------------
707// "drag_end"
708//----------------------------------------------------------------------------
709
710extern "C" {
711static void source_drag_end( GtkWidget          *WXUNUSED(widget),
712                             GdkDragContext     *WXUNUSED(context),
713                             wxDropSource       *drop_source )
714{
715    if (g_isIdle) wxapp_install_idle_handler();
716
717    // printf( "Drag source: drag_end.\n" );
718
719    drop_source->m_waiting = false;
720}
721}
722
723//-----------------------------------------------------------------------------
724// "configure_event" from m_iconWindow
725//-----------------------------------------------------------------------------
726
727extern "C" {
728static gint
729gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
730{
731    if (g_isIdle)
732        wxapp_install_idle_handler();
733
734    source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
735
736    return 0;
737}
738}
739
740//---------------------------------------------------------------------------
741// wxDropSource
742//---------------------------------------------------------------------------
743
744wxDropSource::wxDropSource(wxWindow *win,
745                           const wxIcon &iconCopy,
746                           const wxIcon &iconMove,
747                           const wxIcon &iconNone)
748{
749    m_waiting = true;
750
751    m_iconWindow = (GtkWidget*) NULL;
752
753    m_window = win;
754    m_widget = win->m_widget;
755    if (win->m_wxwindow) m_widget = win->m_wxwindow;
756
757    m_retValue = wxDragCancel;
758
759    SetIcons(iconCopy, iconMove, iconNone);
760}
761
762wxDropSource::wxDropSource(wxDataObject& data,
763                           wxWindow *win,
764                           const wxIcon &iconCopy,
765                           const wxIcon &iconMove,
766                           const wxIcon &iconNone)
767{
768    m_waiting = true;
769
770    SetData( data );
771
772    m_iconWindow = (GtkWidget*) NULL;
773
774    m_window = win;
775    m_widget = win->m_widget;
776    if (win->m_wxwindow) m_widget = win->m_wxwindow;
777
778    m_retValue = wxDragCancel;
779
780    SetIcons(iconCopy, iconMove, iconNone);
781}
782
783void wxDropSource::SetIcons(const wxIcon &iconCopy,
784                            const wxIcon &iconMove,
785                            const wxIcon &iconNone)
786{
787    m_iconCopy = iconCopy;
788    m_iconMove = iconMove;
789    m_iconNone = iconNone;
790
791    if ( !m_iconCopy.Ok() )
792        m_iconCopy = wxIcon(page_xpm);
793    if ( !m_iconMove.Ok() )
794        m_iconMove = m_iconCopy;
795    if ( !m_iconNone.Ok() )
796        m_iconNone = m_iconCopy;
797}
798
799wxDropSource::~wxDropSource()
800{
801}
802
803void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
804{
805    // get the right icon to display
806    wxIcon *icon = NULL;
807    if ( action & GDK_ACTION_MOVE )
808        icon = &m_iconMove;
809    else if ( action & GDK_ACTION_COPY )
810        icon = &m_iconCopy;
811    else
812        icon = &m_iconNone;
813
814    GdkBitmap *mask;
815    if ( icon->GetMask() )
816        mask = icon->GetMask()->GetBitmap();
817    else
818        mask = (GdkBitmap *)NULL;
819
820    GdkPixmap *pixmap = icon->GetPixmap();
821
822    gint width,height;
823    gdk_window_get_size (pixmap, &width, &height);
824
825    GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
826    gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
827    gtk_widget_push_colormap (colormap);
828
829    m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
830    gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
831    gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
832
833    gtk_widget_pop_visual ();
834    gtk_widget_pop_colormap ();
835
836    gtk_widget_set_usize (m_iconWindow, width, height);
837    gtk_widget_realize (m_iconWindow);
838
839    gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
840        GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
841
842    gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
843
844    if (mask)
845        gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
846
847    gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
848}
849
850wxDragResult wxDropSource::DoDragDrop(int flags)
851{
852    wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
853                 wxT("Drop source: no data") );
854
855    // still in drag
856    if (g_blockEventsOnDrag)
857        return wxDragNone;
858
859    // don't start dragging if no button is down
860    if (g_lastButtonNumber == 0)
861        return wxDragNone;
862
863    // we can only start a drag after a mouse event
864    if (g_lastMouseEvent == NULL)
865        return wxDragNone;
866
867    // disabled for now
868    g_blockEventsOnDrag = true;
869
870    RegisterWindow();
871
872    m_waiting = true;
873
874    GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
875
876    wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
877    m_data->GetAllFormats( array );
878    size_t count = m_data->GetFormatCount();
879    for (size_t i = 0; i < count; i++)
880    {
881        GdkAtom atom = array[i];
882        wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
883        gtk_target_list_add( target_list, atom, 0, 0 );
884    }
885    delete[] array;
886
887        int action = GDK_ACTION_COPY;
888        if ( flags & wxDrag_AllowMove )
889            action |= GDK_ACTION_MOVE;
890
891        // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
892        //     to use a global to pass the flags to the drop target but I'd
893        //     surely prefer a better way to do it
894        gs_flagsForDrag = flags;
895
896        GdkDragContext *context = gtk_drag_begin( m_widget,
897                target_list,
898                (GdkDragAction)action,
899                g_lastButtonNumber,  // number of mouse button which started drag
900                (GdkEvent*) g_lastMouseEvent );
901
902        m_dragContext = context;
903
904        PrepareIcon( action, context );
905
906        while (m_waiting)
907            gtk_main_iteration();
908
909        m_retValue = ConvertFromGTK(context->action);
910        if ( m_retValue == wxDragNone )
911            m_retValue = wxDragCancel;
912
913    g_blockEventsOnDrag = false;
914
915    UnregisterWindow();
916
917    return m_retValue;
918}
919
920void wxDropSource::RegisterWindow()
921{
922    if (!m_widget) return;
923
924    gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
925                      GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
926    gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
927                      GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
928    gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
929                      GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
930    gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
931                      GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
932
933}
934
935void wxDropSource::UnregisterWindow()
936{
937    if (!m_widget) return;
938
939    gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
940                      GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
941    gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
942                      GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
943    gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
944                      GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
945    gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
946                      GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
947}
948
949#endif
950      // wxUSE_DRAG_AND_DROP
951