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1 ///////////////////////////////////////////////////////////////////////////////
2 // Name: src/gtk/dnd.cpp
3 // Purpose: wxDropTarget class
4 // Author: Robert Roebling
5 // Id: $Id$
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/scopeguard.h"
27
28 #include <gtk/gtk.h>
29
30 //----------------------------------------------------------------------------
31 // global data
32 //----------------------------------------------------------------------------
33
34 extern bool g_blockEventsOnDrag;
35
36 // the flags used for the last DoDragDrop()
37 static long gs_flagsForDrag = 0;
38
39 #ifdef __WXDEBUG__
40 // the trace mask we use with wxLogTrace() - call
41 // wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
42 // (there are quite a few of them, so don't enable this by default)
43 static const wxChar *TRACE_DND = _T("dnd");
44 #endif
45
46 // global variables because GTK+ DnD want to have the
47 // mouse event that caused it
48 extern GdkEvent *g_lastMouseEvent;
49 extern int g_lastButtonNumber;
50
51 //----------------------------------------------------------------------------
52 // standard icons
53 //----------------------------------------------------------------------------
54
55 /* Copyright (c) Julian Smart */
56 static const char * page_xpm[] = {
57 /* columns rows colors chars-per-pixel */
58 "32 32 37 1",
59 "5 c #7198D9",
60 ", c #769CDA",
61 "2 c #DCE6F6",
62 "i c #FFFFFF",
63 "e c #779DDB",
64 ": c #9AB6E4",
65 "9 c #EAF0FA",
66 "- c #B1C7EB",
67 "$ c #6992D7",
68 "y c #F7F9FD",
69 "= c #BED0EE",
70 "q c #F0F5FC",
71 "; c #A8C0E8",
72 "@ c #366BC2",
73 " c None",
74 "u c #FDFEFF",
75 "8 c #5987D3",
76 "* c #C4D5F0",
77 "7 c #7CA0DC",
78 "O c #487BCE",
79 "< c #6B94D7",
80 "& c #CCDAF2",
81 "> c #89A9DF",
82 "3 c #5584D1",
83 "w c #82A5DE",
84 "1 c #3F74CB",
85 "+ c #3A70CA",
86 ". c #3569BF",
87 "% c #D2DFF4",
88 "# c #3366BB",
89 "r c #F5F8FD",
90 "0 c #FAFCFE",
91 "4 c #DFE8F7",
92 "X c #5E8AD4",
93 "o c #5282D0",
94 "t c #B8CCEC",
95 "6 c #E5EDF9",
96 /* pixels */
97 " ",
98 " ",
99 " ",
100 " ",
101 " ",
102 " .XXXooOO++@# ",
103 " $%&*=-;::>,<1 ",
104 " $2%&*=-;::><:3 ",
105 " $42%&*=-;::<&:3 ",
106 " 56477<<<<8<<9&:X ",
107 " 59642%&*=-;<09&:5 ",
108 " 5q9642%&*=-<<<<<# ",
109 " 5qqw777<<<<<88:>+ ",
110 " erqq9642%&*=t;::+ ",
111 " eyrqq9642%&*=t;:O ",
112 " eyywwww777<<<<t;O ",
113 " e0yyrqq9642%&*=to ",
114 " e00yyrqq9642%&*=o ",
115 " eu0wwwwwww777<&*X ",
116 " euu00yyrqq9642%&X ",
117 " eiuu00yyrqq9642%X ",
118 " eiiwwwwwwwwww742$ ",
119 " eiiiuu00yyrqq964$ ",
120 " eiiiiuu00yyrqq96$ ",
121 " eiiiiiuu00yyrqq95 ",
122 " eiiiiiiuu00yyrqq5 ",
123 " eeeeeeeeeeeeee55e ",
124 " ",
125 " ",
126 " ",
127 " ",
128 " "
129 };
130
131
132 // ============================================================================
133 // private functions
134 // ============================================================================
135
136 // ----------------------------------------------------------------------------
137 // convert between GTK+ and wxWidgets DND constants
138 // ----------------------------------------------------------------------------
139
140 static wxDragResult ConvertFromGTK(long action)
141 {
142 switch ( action )
143 {
144 case GDK_ACTION_COPY:
145 return wxDragCopy;
146
147 case GDK_ACTION_LINK:
148 return wxDragLink;
149
150 case GDK_ACTION_MOVE:
151 return wxDragMove;
152 }
153
154 return wxDragNone;
155 }
156
157 // ----------------------------------------------------------------------------
158 // "drag_leave"
159 // ----------------------------------------------------------------------------
160
161 extern "C" {
162 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
163 GdkDragContext *context,
164 guint WXUNUSED(time),
165 wxDropTarget *drop_target )
166 {
167 /* inform the wxDropTarget about the current GdkDragContext.
168 this is only valid for the duration of this call */
169 drop_target->SetDragContext( context );
170
171 /* we don't need return values. this event is just for
172 information */
173 drop_target->OnLeave();
174
175 /* this has to be done because GDK has no "drag_enter" event */
176 drop_target->m_firstMotion = true;
177
178 /* after this, invalidate the drop_target's GdkDragContext */
179 drop_target->SetDragContext( (GdkDragContext*) NULL );
180 }
181 }
182
183 // ----------------------------------------------------------------------------
184 // "drag_motion"
185 // ----------------------------------------------------------------------------
186
187 extern "C" {
188 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
189 GdkDragContext *context,
190 gint x,
191 gint y,
192 guint time,
193 wxDropTarget *drop_target )
194 {
195 /* Owen Taylor: "if the coordinates not in a drop zone,
196 return FALSE, otherwise call gtk_drag_status() and
197 return TRUE" */
198
199 #if 0
200 wxPrintf( "motion\n" );
201 GList *tmp_list;
202 for (tmp_list = context->targets; tmp_list; tmp_list = tmp_list->next)
203 {
204 wxString atom = wxString::FromAscii( gdk_atom_name (GDK_POINTER_TO_ATOM (tmp_list->data)) );
205 wxPrintf( "Atom: %s\n", atom );
206 }
207 #endif
208
209 /* inform the wxDropTarget about the current GdkDragContext.
210 this is only valid for the duration of this call */
211 drop_target->SetDragContext( context );
212
213 // GTK+ always supposes that we want to copy the data by default while we
214 // might want to move it, so examine not only suggested_action - which is
215 // only good if we don't have our own preferences - but also the actions
216 // field
217 wxDragResult result;
218 if (drop_target->GetDefaultAction() == wxDragNone)
219 {
220 // use default action set by wxDropSource::DoDragDrop()
221 if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
222 (context->actions & GDK_ACTION_MOVE ) )
223 {
224 // move is requested by the program and allowed by GTK+ - do it, even
225 // though suggested_action may be currently wxDragCopy
226 result = wxDragMove;
227 }
228 else // use whatever GTK+ says we should
229 {
230 result = ConvertFromGTK(context->suggested_action);
231
232 if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
233 {
234 // we're requested to move but we can't
235 result = wxDragCopy;
236 }
237 }
238 }
239 else if (drop_target->GetDefaultAction() == wxDragMove &&
240 (context->actions & GDK_ACTION_MOVE))
241 {
242
243 result = wxDragMove;
244 }
245 else
246 {
247 if (context->actions & GDK_ACTION_COPY)
248 result = wxDragCopy;
249 else if (context->actions & GDK_ACTION_MOVE)
250 result = wxDragMove;
251 else
252 result = wxDragNone;
253 }
254
255 if (drop_target->m_firstMotion)
256 {
257 /* the first "drag_motion" event substitutes a "drag_enter" event */
258 result = drop_target->OnEnter( x, y, result );
259 }
260 else
261 {
262 /* give program a chance to react (i.e. to say no by returning FALSE) */
263 result = drop_target->OnDragOver( x, y, result );
264 }
265
266 bool ret = wxIsDragResultOk( result );
267 if (ret)
268 {
269 GdkDragAction action;
270 if (result == wxDragCopy)
271 action = GDK_ACTION_COPY;
272 else if (result == wxDragLink)
273 action = GDK_ACTION_LINK;
274 else
275 action = GDK_ACTION_MOVE;
276
277 gdk_drag_status( context, action, time );
278 }
279
280 /* after this, invalidate the drop_target's GdkDragContext */
281 drop_target->SetDragContext( (GdkDragContext*) NULL );
282
283 /* this has to be done because GDK has no "drag_enter" event */
284 drop_target->m_firstMotion = false;
285
286 return ret;
287 }
288 }
289
290 // ----------------------------------------------------------------------------
291 // "drag_drop"
292 // ----------------------------------------------------------------------------
293
294 extern "C" {
295 static gboolean target_drag_drop( GtkWidget *widget,
296 GdkDragContext *context,
297 gint x,
298 gint y,
299 guint time,
300 wxDropTarget *drop_target )
301 {
302 /* Owen Taylor: "if the drop is not in a drop zone,
303 return FALSE, otherwise, if you aren't accepting
304 the drop, call gtk_drag_finish() with success == FALSE
305 otherwise call gtk_drag_data_get()" */
306
307 /* this seems to make a difference between not accepting
308 due to wrong target area and due to wrong format. let
309 us hope that this is not required.. */
310
311 /* inform the wxDropTarget about the current GdkDragContext.
312 this is only valid for the duration of this call */
313 drop_target->SetDragContext( context );
314
315 /* inform the wxDropTarget about the current drag widget.
316 this is only valid for the duration of this call */
317 drop_target->SetDragWidget( widget );
318
319 /* inform the wxDropTarget about the current drag time.
320 this is only valid for the duration of this call */
321 drop_target->SetDragTime( time );
322
323 /*
324 wxDragResult result = wxDragMove;
325 if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
326 */
327
328 /* reset the block here as someone might very well
329 show a dialog as a reaction to a drop and this
330 wouldn't work without events */
331 g_blockEventsOnDrag = false;
332
333 bool ret = drop_target->OnDrop( x, y );
334
335 if (!ret)
336 {
337 #ifdef __WXDEBUG__
338 wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
339 #endif
340
341 /* cancel the whole thing */
342 gtk_drag_finish( context,
343 FALSE, /* no success */
344 FALSE, /* don't delete data on dropping side */
345 time );
346 }
347 else
348 {
349 #ifdef __WXDEBUG__
350 wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned true") );
351 #endif
352
353 #if wxUSE_THREADS
354 /* disable GUI threads */
355 #endif
356
357 GdkAtom format = drop_target->GetMatchingPair();
358
359 // this does happen somehow, see bug 555111
360 wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") );
361
362 /*
363 GdkDragAction action = GDK_ACTION_MOVE;
364 if (result == wxDragCopy) action == GDK_ACTION_COPY;
365 context->action = action;
366 */
367 /* this should trigger an "drag_data_received" event */
368 gtk_drag_get_data( widget,
369 context,
370 format,
371 time );
372
373 #if wxUSE_THREADS
374 /* re-enable GUI threads */
375 #endif
376 }
377
378 /* after this, invalidate the drop_target's GdkDragContext */
379 drop_target->SetDragContext( (GdkDragContext*) NULL );
380
381 /* after this, invalidate the drop_target's drag widget */
382 drop_target->SetDragWidget( (GtkWidget*) NULL );
383
384 /* this has to be done because GDK has no "drag_enter" event */
385 drop_target->m_firstMotion = true;
386
387 return ret;
388 }
389 }
390
391 // ----------------------------------------------------------------------------
392 // "drag_data_received"
393 // ----------------------------------------------------------------------------
394
395 extern "C" {
396 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
397 GdkDragContext *context,
398 gint x,
399 gint y,
400 GtkSelectionData *data,
401 guint WXUNUSED(info),
402 guint time,
403 wxDropTarget *drop_target )
404 {
405 /* Owen Taylor: "call gtk_drag_finish() with
406 success == TRUE" */
407
408 if ((data->length <= 0) || (data->format != 8))
409 {
410 /* negative data length and non 8-bit data format
411 qualifies for junk */
412 gtk_drag_finish (context, FALSE, FALSE, time);
413
414 return;
415 }
416
417 #ifdef __WXDEBUG__
418 wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
419 #endif
420
421 /* inform the wxDropTarget about the current GtkSelectionData.
422 this is only valid for the duration of this call */
423 drop_target->SetDragData( data );
424
425 wxDragResult result = ConvertFromGTK(context->action);
426
427 if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
428 {
429 #ifdef __WXDEBUG__
430 wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned true") );
431 #endif
432
433 /* tell GTK that data transfer was successful */
434 gtk_drag_finish( context, TRUE, FALSE, time );
435 }
436 else
437 {
438 #ifdef __WXDEBUG__
439 wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
440 #endif
441
442 /* tell GTK that data transfer was not successful */
443 gtk_drag_finish( context, FALSE, FALSE, time );
444 }
445
446 /* after this, invalidate the drop_target's drag data */
447 drop_target->SetDragData( (GtkSelectionData*) NULL );
448 }
449 }
450
451 //----------------------------------------------------------------------------
452 // wxDropTarget
453 //----------------------------------------------------------------------------
454
455 wxDropTarget::wxDropTarget( wxDataObject *data )
456 : wxDropTargetBase( data )
457 {
458 m_firstMotion = true;
459 m_dragContext = (GdkDragContext*) NULL;
460 m_dragWidget = (GtkWidget*) NULL;
461 m_dragData = (GtkSelectionData*) NULL;
462 m_dragTime = 0;
463 }
464
465 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
466 wxCoord WXUNUSED(y),
467 wxDragResult def )
468 {
469 // GetMatchingPair() checks for m_dataObject too, no need to do it here
470
471 // disable the debug message from GetMatchingPair() - there are too many
472 // of them otherwise
473 #ifdef __WXDEBUG__
474 wxLogNull noLog;
475 #endif // Debug
476
477 return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
478 }
479
480 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
481 {
482 if (!m_dataObject)
483 return false;
484
485 return (GetMatchingPair() != (GdkAtom) 0);
486 }
487
488 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
489 wxDragResult def )
490 {
491 if (!m_dataObject)
492 return wxDragNone;
493
494 if (GetMatchingPair() == (GdkAtom) 0)
495 return wxDragNone;
496
497 return GetData() ? def : wxDragNone;
498 }
499
500 GdkAtom wxDropTarget::GetMatchingPair()
501 {
502 if (!m_dataObject)
503 return (GdkAtom) 0;
504
505 if (!m_dragContext)
506 return (GdkAtom) 0;
507
508 GList *child = m_dragContext->targets;
509 while (child)
510 {
511 GdkAtom formatAtom = (GdkAtom)(child->data);
512 wxDataFormat format( formatAtom );
513
514 #ifdef __WXDEBUG__
515 wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
516 format.GetId().c_str());
517 #endif // Debug
518
519 if (m_dataObject->IsSupportedFormat( format ))
520 return formatAtom;
521
522 child = child->next;
523 }
524
525 return (GdkAtom) 0;
526 }
527
528 bool wxDropTarget::GetData()
529 {
530 if (!m_dragData)
531 return false;
532
533 if (!m_dataObject)
534 return false;
535
536 wxDataFormat dragFormat( m_dragData->target );
537
538 if (!m_dataObject->IsSupportedFormat( dragFormat ))
539 return false;
540
541 m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
542
543 return true;
544 }
545
546 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
547 {
548 wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
549
550 gtk_drag_dest_unset( widget );
551
552 g_signal_handlers_disconnect_by_func (widget,
553 (gpointer) target_drag_leave, this);
554 g_signal_handlers_disconnect_by_func (widget,
555 (gpointer) target_drag_motion, this);
556 g_signal_handlers_disconnect_by_func (widget,
557 (gpointer) target_drag_drop, this);
558 g_signal_handlers_disconnect_by_func (widget,
559 (gpointer) target_drag_data_received, this);
560 }
561
562 void wxDropTarget::RegisterWidget( GtkWidget *widget )
563 {
564 wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
565
566 /* gtk_drag_dest_set() determines what default behaviour we'd like
567 GTK to supply. we don't want to specify out targets (=formats)
568 or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
569 not GTK_DEST_DEFAULT_DROP). instead we react individually to
570 "drag_motion" and "drag_drop" events. this makes it possible
571 to allow dropping on only a small area. we should set
572 GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
573 highlighting if dragging over standard controls, but this
574 seems to be broken without the other two. */
575
576 gtk_drag_dest_set( widget,
577 (GtkDestDefaults) 0, /* no default behaviour */
578 (GtkTargetEntry*) NULL, /* we don't supply any formats here */
579 0, /* number of targets = 0 */
580 (GdkDragAction) 0 ); /* we don't supply any actions here */
581
582 g_signal_connect (widget, "drag_leave",
583 G_CALLBACK (target_drag_leave), this);
584
585 g_signal_connect (widget, "drag_motion",
586 G_CALLBACK (target_drag_motion), this);
587
588 g_signal_connect (widget, "drag_drop",
589 G_CALLBACK (target_drag_drop), this);
590
591 g_signal_connect (widget, "drag_data_received",
592 G_CALLBACK (target_drag_data_received), this);
593 }
594
595 //----------------------------------------------------------------------------
596 // "drag_data_get"
597 //----------------------------------------------------------------------------
598
599 extern "C" {
600 static void
601 source_drag_data_get (GtkWidget *WXUNUSED(widget),
602 GdkDragContext *WXUNUSED(context),
603 GtkSelectionData *selection_data,
604 guint WXUNUSED(info),
605 guint WXUNUSED(time),
606 wxDropSource *drop_source )
607 {
608 wxDataFormat format( selection_data->target );
609
610 #ifdef __WXDEBUG__
611 wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
612 format.GetId().c_str());
613 #endif
614
615 drop_source->m_retValue = wxDragCancel;
616
617 wxDataObject *data = drop_source->GetDataObject();
618
619 if (!data)
620 {
621 #ifdef __WXDEBUG__
622 wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
623 #endif
624 return;
625 }
626
627 if (!data->IsSupportedFormat(format))
628 {
629 #ifdef __WXDEBUG__
630 wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
631 #endif
632 return;
633 }
634
635 if (data->GetDataSize(format) == 0)
636 {
637 #ifdef __WXDEBUG__
638 wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
639 #endif
640 return;
641 }
642
643 size_t size = data->GetDataSize(format);
644
645 // printf( "data size: %d.\n", (int)data_size );
646
647 guchar *d = new guchar[size];
648
649 if (!data->GetDataHere( format, (void*)d ))
650 {
651 delete[] d;
652 return;
653 }
654
655 #if wxUSE_THREADS
656 /* disable GUI threads */
657 #endif
658
659 gtk_selection_data_set( selection_data,
660 selection_data->target,
661 8, // 8-bit
662 d,
663 size );
664
665 #if wxUSE_THREADS
666 /* enable GUI threads */
667 #endif
668
669 delete[] d;
670 }
671 }
672
673 //----------------------------------------------------------------------------
674 // "drag_end"
675 //----------------------------------------------------------------------------
676
677 extern "C" {
678 static void source_drag_end( GtkWidget *WXUNUSED(widget),
679 GdkDragContext *WXUNUSED(context),
680 wxDropSource *drop_source )
681 {
682 // printf( "Drag source: drag_end.\n" );
683
684 drop_source->m_waiting = false;
685 }
686 }
687
688 //-----------------------------------------------------------------------------
689 // "configure_event" from m_iconWindow
690 //-----------------------------------------------------------------------------
691
692 extern "C" {
693 static gint
694 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
695 {
696 source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
697
698 return 0;
699 }
700 }
701
702 //---------------------------------------------------------------------------
703 // wxDropSource
704 //---------------------------------------------------------------------------
705
706 wxDropSource::wxDropSource(wxWindow *win,
707 const wxIcon &iconCopy,
708 const wxIcon &iconMove,
709 const wxIcon &iconNone)
710 {
711 m_waiting = true;
712
713 m_iconWindow = (GtkWidget*) NULL;
714
715 m_window = win;
716 m_widget = win->m_widget;
717 if (win->m_wxwindow) m_widget = win->m_wxwindow;
718
719 m_retValue = wxDragCancel;
720
721 SetIcons(iconCopy, iconMove, iconNone);
722 }
723
724 wxDropSource::wxDropSource(wxDataObject& data,
725 wxWindow *win,
726 const wxIcon &iconCopy,
727 const wxIcon &iconMove,
728 const wxIcon &iconNone)
729 {
730 m_waiting = true;
731
732 SetData( data );
733
734 m_iconWindow = (GtkWidget*) NULL;
735
736 m_window = win;
737 m_widget = win->m_widget;
738 if (win->m_wxwindow) m_widget = win->m_wxwindow;
739
740 m_retValue = wxDragCancel;
741
742 SetIcons(iconCopy, iconMove, iconNone);
743 }
744
745 void wxDropSource::SetIcons(const wxIcon &iconCopy,
746 const wxIcon &iconMove,
747 const wxIcon &iconNone)
748 {
749 m_iconCopy = iconCopy;
750 m_iconMove = iconMove;
751 m_iconNone = iconNone;
752
753 if ( !m_iconCopy.Ok() )
754 m_iconCopy = wxIcon(page_xpm);
755 if ( !m_iconMove.Ok() )
756 m_iconMove = m_iconCopy;
757 if ( !m_iconNone.Ok() )
758 m_iconNone = m_iconCopy;
759 }
760
761 wxDropSource::~wxDropSource()
762 {
763 }
764
765 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
766 {
767 // get the right icon to display
768 wxIcon *icon = NULL;
769 if ( action & GDK_ACTION_MOVE )
770 icon = &m_iconMove;
771 else if ( action & GDK_ACTION_COPY )
772 icon = &m_iconCopy;
773 else
774 icon = &m_iconNone;
775
776 GdkBitmap *mask;
777 if ( icon->GetMask() )
778 mask = icon->GetMask()->GetBitmap();
779 else
780 mask = (GdkBitmap *)NULL;
781
782 GdkPixmap *pixmap = icon->GetPixmap();
783
784 gint width,height;
785 gdk_drawable_get_size (pixmap, &width, &height);
786
787 GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
788 gtk_widget_push_colormap (colormap);
789
790 m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
791 gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
792 gtk_widget_set_app_paintable (m_iconWindow, TRUE);
793
794 gtk_widget_pop_colormap ();
795
796 gtk_widget_set_size_request (m_iconWindow, width, height);
797 gtk_widget_realize (m_iconWindow);
798
799 g_signal_connect (m_iconWindow, "configure_event",
800 G_CALLBACK (gtk_dnd_window_configure_callback), this);
801
802 gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
803
804 if (mask)
805 gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
806
807 gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
808 }
809
810 wxDragResult wxDropSource::DoDragDrop(int flags)
811 {
812 wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
813 wxT("Drop source: no data") );
814
815 // still in drag
816 if (g_blockEventsOnDrag)
817 return wxDragNone;
818
819 // don't start dragging if no button is down
820 if (g_lastButtonNumber == 0)
821 return wxDragNone;
822
823 // we can only start a drag after a mouse event
824 if (g_lastMouseEvent == NULL)
825 return wxDragNone;
826
827 GTKConnectDragSignals();
828 wxON_BLOCK_EXIT_OBJ0(*this, wxDropSource::GTKDisconnectDragSignals);
829
830 m_waiting = true;
831
832 GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
833
834 wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
835 m_data->GetAllFormats( array );
836 size_t count = m_data->GetFormatCount();
837 for (size_t i = 0; i < count; i++)
838 {
839 GdkAtom atom = array[i];
840 #ifdef __WXDEBUG__
841 wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
842 #endif
843 gtk_target_list_add( target_list, atom, 0, 0 );
844 }
845 delete[] array;
846
847 int action = GDK_ACTION_COPY;
848 if ( flags & wxDrag_AllowMove )
849 action |= GDK_ACTION_MOVE;
850
851 // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
852 // to use a global to pass the flags to the drop target but I'd
853 // surely prefer a better way to do it
854 gs_flagsForDrag = flags;
855
856 GdkDragContext *context = gtk_drag_begin( m_widget,
857 target_list,
858 (GdkDragAction)action,
859 g_lastButtonNumber, // number of mouse button which started drag
860 (GdkEvent*) g_lastMouseEvent );
861
862 if ( !context )
863 {
864 // this can happen e.g. if gdk_pointer_grab() failed
865 return wxDragError;
866 }
867
868 m_dragContext = context;
869
870 PrepareIcon( action, context );
871
872 while (m_waiting)
873 gtk_main_iteration();
874
875 m_retValue = ConvertFromGTK(context->action);
876 if ( m_retValue == wxDragNone )
877 m_retValue = wxDragCancel;
878
879 return m_retValue;
880 }
881
882 void wxDropSource::GTKConnectDragSignals()
883 {
884 if (!m_widget)
885 return;
886
887 g_blockEventsOnDrag = true;
888
889 g_signal_connect (m_widget, "drag_data_get",
890 G_CALLBACK (source_drag_data_get), this);
891 g_signal_connect (m_widget, "drag_end",
892 G_CALLBACK (source_drag_end), this);
893
894 }
895
896 void wxDropSource::GTKDisconnectDragSignals()
897 {
898 if (!m_widget)
899 return;
900
901 g_blockEventsOnDrag = false;
902
903 g_signal_handlers_disconnect_by_func (m_widget,
904 (gpointer) source_drag_data_get,
905 this);
906 g_signal_handlers_disconnect_by_func (m_widget,
907 (gpointer) source_drag_end,
908 this);
909 }
910
911 #endif
912 // wxUSE_DRAG_AND_DROP