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Simplify SetValue() with empty string
[wxWidgets.git] / src / gtk / dnd.cpp
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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
34extern bool g_blockEventsOnDrag;
35
36// the flags used for the last DoDragDrop()
37static 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)
43static 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
48extern GdkEvent *g_lastMouseEvent;
49extern int g_lastButtonNumber;
50
51//----------------------------------------------------------------------------
52// standard icons
53//----------------------------------------------------------------------------
54
55/* Copyright (c) Julian Smart */
56static 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
140static 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
161extern "C" {
162static 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
187extern "C" {
188static 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
294extern "C" {
295static 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
395extern "C" {
396static 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
455wxDropTarget::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
465wxDragResult 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
480bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
481{
482 if (!m_dataObject)
483 return false;
484
485 return (GetMatchingPair() != (GdkAtom) 0);
486}
487
488wxDragResult 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
500GdkAtom 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
528bool 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
546void 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
562void 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
599extern "C" {
600static void
601source_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
677extern "C" {
678static 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
692extern "C" {
693static gint
694gtk_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
706wxDropSource::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
724wxDropSource::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
745void 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
761wxDropSource::~wxDropSource()
762{
763}
764
765void 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
810wxDragResult 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
882void 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
896void 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
wxWidgets (Impactor)