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[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->GtkSetDragContext( 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->GtkSetDragContext( 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->GtkSetDragContext( 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->GtkSetDragContext( 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->GtkSetDragContext( 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->GtkSetDragWidget( 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->GtkSetDragTime( 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->GtkGetMatchingPair();
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->GtkSetDragContext( NULL );
380
381 /* after this, invalidate the drop_target's drag widget */
382 drop_target->GtkSetDragWidget( 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->GtkSetDragData( 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->GtkSetDragData( NULL );
448}
449}
450
451//----------------------------------------------------------------------------
452// wxDropTarget
453//----------------------------------------------------------------------------
454
455wxDropTarget::wxDropTarget( wxDataObject *data )
456 : wxDropTargetBase( data )
457{
458 m_firstMotion = true;
459 m_dragContext = NULL;
460 m_dragWidget = NULL;
461 m_dragData = 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 (GtkGetMatchingPair() != (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 (GtkGetMatchingPair() != (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 (GtkGetMatchingPair() == (GdkAtom) 0)
495 return wxDragNone;
496
497 return GetData() ? def : wxDragNone;
498}
499
500
501wxDataFormat wxDropTarget::GetMatchingPair()
502{
503 return wxDataFormat( GtkGetMatchingPair() );
504}
505
506GdkAtom wxDropTarget::GtkGetMatchingPair()
507{
508 if (!m_dataObject)
509 return (GdkAtom) 0;
510
511 if (!m_dragContext)
512 return (GdkAtom) 0;
513
514 GList *child = m_dragContext->targets;
515 while (child)
516 {
517 GdkAtom formatAtom = (GdkAtom)(child->data);
518 wxDataFormat format( formatAtom );
519
520#ifdef __WXDEBUG__
521 wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
522 format.GetId().c_str());
523#endif // Debug
524
525 if (m_dataObject->IsSupportedFormat( format ))
526 return formatAtom;
527
528 child = child->next;
529 }
530
531 return (GdkAtom) 0;
532}
533
534bool wxDropTarget::GetData()
535{
536 if (!m_dragData)
537 return false;
538
539 if (!m_dataObject)
540 return false;
541
542 wxDataFormat dragFormat( m_dragData->target );
543
544 if (!m_dataObject->IsSupportedFormat( dragFormat ))
545 return false;
546
547 m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
548
549 return true;
550}
551
552void wxDropTarget::GtkUnregisterWidget( GtkWidget *widget )
553{
554 wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
555
556 gtk_drag_dest_unset( widget );
557
558 g_signal_handlers_disconnect_by_func (widget,
559 (gpointer) target_drag_leave, this);
560 g_signal_handlers_disconnect_by_func (widget,
561 (gpointer) target_drag_motion, this);
562 g_signal_handlers_disconnect_by_func (widget,
563 (gpointer) target_drag_drop, this);
564 g_signal_handlers_disconnect_by_func (widget,
565 (gpointer) target_drag_data_received, this);
566}
567
568void wxDropTarget::GtkRegisterWidget( GtkWidget *widget )
569{
570 wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
571
572 /* gtk_drag_dest_set() determines what default behaviour we'd like
573 GTK to supply. we don't want to specify out targets (=formats)
574 or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
575 not GTK_DEST_DEFAULT_DROP). instead we react individually to
576 "drag_motion" and "drag_drop" events. this makes it possible
577 to allow dropping on only a small area. we should set
578 GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
579 highlighting if dragging over standard controls, but this
580 seems to be broken without the other two. */
581
582 gtk_drag_dest_set( widget,
583 (GtkDestDefaults) 0, /* no default behaviour */
584 NULL, /* we don't supply any formats here */
585 0, /* number of targets = 0 */
586 (GdkDragAction) 0 ); /* we don't supply any actions here */
587
588 g_signal_connect (widget, "drag_leave",
589 G_CALLBACK (target_drag_leave), this);
590
591 g_signal_connect (widget, "drag_motion",
592 G_CALLBACK (target_drag_motion), this);
593
594 g_signal_connect (widget, "drag_drop",
595 G_CALLBACK (target_drag_drop), this);
596
597 g_signal_connect (widget, "drag_data_received",
598 G_CALLBACK (target_drag_data_received), this);
599}
600
601//----------------------------------------------------------------------------
602// "drag_data_get"
603//----------------------------------------------------------------------------
604
605extern "C" {
606static void
607source_drag_data_get (GtkWidget *WXUNUSED(widget),
608 GdkDragContext *WXUNUSED(context),
609 GtkSelectionData *selection_data,
610 guint WXUNUSED(info),
611 guint WXUNUSED(time),
612 wxDropSource *drop_source )
613{
614 wxDataFormat format( selection_data->target );
615
616#ifdef __WXDEBUG__
617 wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
618 format.GetId().c_str());
619#endif
620
621 drop_source->m_retValue = wxDragCancel;
622
623 wxDataObject *data = drop_source->GetDataObject();
624
625 if (!data)
626 {
627#ifdef __WXDEBUG__
628 wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
629#endif
630 return;
631 }
632
633 if (!data->IsSupportedFormat(format))
634 {
635#ifdef __WXDEBUG__
636 wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
637#endif
638 return;
639 }
640
641 if (data->GetDataSize(format) == 0)
642 {
643#ifdef __WXDEBUG__
644 wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
645#endif
646 return;
647 }
648
649 size_t size = data->GetDataSize(format);
650
651// printf( "data size: %d.\n", (int)data_size );
652
653 guchar *d = new guchar[size];
654
655 if (!data->GetDataHere( format, (void*)d ))
656 {
657 delete[] d;
658 return;
659 }
660
661#if wxUSE_THREADS
662 /* disable GUI threads */
663#endif
664
665 gtk_selection_data_set( selection_data,
666 selection_data->target,
667 8, // 8-bit
668 d,
669 size );
670
671#if wxUSE_THREADS
672 /* enable GUI threads */
673#endif
674
675 delete[] d;
676}
677}
678
679//----------------------------------------------------------------------------
680// "drag_end"
681//----------------------------------------------------------------------------
682
683extern "C" {
684static void source_drag_end( GtkWidget *WXUNUSED(widget),
685 GdkDragContext *WXUNUSED(context),
686 wxDropSource *drop_source )
687{
688 // printf( "Drag source: drag_end.\n" );
689
690 drop_source->m_waiting = false;
691}
692}
693
694//-----------------------------------------------------------------------------
695// "configure_event" from m_iconWindow
696//-----------------------------------------------------------------------------
697
698extern "C" {
699static gint
700gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
701{
702 source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
703
704 return 0;
705}
706}
707
708//---------------------------------------------------------------------------
709// wxDropSource
710//---------------------------------------------------------------------------
711
712wxDropSource::wxDropSource(wxWindow *win,
713 const wxIcon &iconCopy,
714 const wxIcon &iconMove,
715 const wxIcon &iconNone)
716{
717 m_waiting = true;
718
719 m_iconWindow = NULL;
720
721 m_window = win;
722 m_widget = win->m_widget;
723 if (win->m_wxwindow) m_widget = win->m_wxwindow;
724
725 m_retValue = wxDragCancel;
726
727 SetIcons(iconCopy, iconMove, iconNone);
728}
729
730wxDropSource::wxDropSource(wxDataObject& data,
731 wxWindow *win,
732 const wxIcon &iconCopy,
733 const wxIcon &iconMove,
734 const wxIcon &iconNone)
735{
736 m_waiting = true;
737
738 SetData( data );
739
740 m_iconWindow = NULL;
741
742 m_window = win;
743 m_widget = win->m_widget;
744 if (win->m_wxwindow) m_widget = win->m_wxwindow;
745
746 m_retValue = wxDragCancel;
747
748 SetIcons(iconCopy, iconMove, iconNone);
749}
750
751void wxDropSource::SetIcons(const wxIcon &iconCopy,
752 const wxIcon &iconMove,
753 const wxIcon &iconNone)
754{
755 m_iconCopy = iconCopy;
756 m_iconMove = iconMove;
757 m_iconNone = iconNone;
758
759 if ( !m_iconCopy.Ok() )
760 m_iconCopy = wxIcon(page_xpm);
761 if ( !m_iconMove.Ok() )
762 m_iconMove = m_iconCopy;
763 if ( !m_iconNone.Ok() )
764 m_iconNone = m_iconCopy;
765}
766
767wxDropSource::~wxDropSource()
768{
769}
770
771void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
772{
773 // get the right icon to display
774 wxIcon *icon = NULL;
775 if ( action & GDK_ACTION_MOVE )
776 icon = &m_iconMove;
777 else if ( action & GDK_ACTION_COPY )
778 icon = &m_iconCopy;
779 else
780 icon = &m_iconNone;
781
782 GdkBitmap *mask;
783 if ( icon->GetMask() )
784 mask = icon->GetMask()->GetBitmap();
785 else
786 mask = NULL;
787
788 GdkPixmap *pixmap = icon->GetPixmap();
789
790 gint width,height;
791 gdk_drawable_get_size (pixmap, &width, &height);
792
793 GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
794 gtk_widget_push_colormap (colormap);
795
796 m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
797 gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
798 gtk_widget_set_app_paintable (m_iconWindow, TRUE);
799
800 gtk_widget_pop_colormap ();
801
802 gtk_widget_set_size_request (m_iconWindow, width, height);
803 gtk_widget_realize (m_iconWindow);
804
805 g_signal_connect (m_iconWindow, "configure_event",
806 G_CALLBACK (gtk_dnd_window_configure_callback), this);
807
808 gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
809
810 if (mask)
811 gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
812
813 gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
814}
815
816wxDragResult wxDropSource::DoDragDrop(int flags)
817{
818 wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
819 wxT("Drop source: no data") );
820
821 // still in drag
822 if (g_blockEventsOnDrag)
823 return wxDragNone;
824
825 // don't start dragging if no button is down
826 if (g_lastButtonNumber == 0)
827 return wxDragNone;
828
829 // we can only start a drag after a mouse event
830 if (g_lastMouseEvent == NULL)
831 return wxDragNone;
832
833 GTKConnectDragSignals();
834 wxON_BLOCK_EXIT_OBJ0(*this, wxDropSource::GTKDisconnectDragSignals);
835
836 m_waiting = true;
837
838 GtkTargetList *target_list = gtk_target_list_new( NULL, 0 );
839
840 wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
841 m_data->GetAllFormats( array );
842 size_t count = m_data->GetFormatCount();
843 for (size_t i = 0; i < count; i++)
844 {
845 GdkAtom atom = array[i];
846#ifdef __WXDEBUG__
847 wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
848#endif
849 gtk_target_list_add( target_list, atom, 0, 0 );
850 }
851 delete[] array;
852
853 int action = GDK_ACTION_COPY;
854 if ( flags & wxDrag_AllowMove )
855 action |= GDK_ACTION_MOVE;
856
857 // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
858 // to use a global to pass the flags to the drop target but I'd
859 // surely prefer a better way to do it
860 gs_flagsForDrag = flags;
861
862 GdkDragContext *context = gtk_drag_begin( m_widget,
863 target_list,
864 (GdkDragAction)action,
865 g_lastButtonNumber, // number of mouse button which started drag
866 (GdkEvent*) g_lastMouseEvent );
867
868 if ( !context )
869 {
870 // this can happen e.g. if gdk_pointer_grab() failed
871 return wxDragError;
872 }
873
874 m_dragContext = context;
875
876 PrepareIcon( action, context );
877
878 while (m_waiting)
879 gtk_main_iteration();
880
881 m_retValue = ConvertFromGTK(context->action);
882 if ( m_retValue == wxDragNone )
883 m_retValue = wxDragCancel;
884
885 return m_retValue;
886}
887
888void wxDropSource::GTKConnectDragSignals()
889{
890 if (!m_widget)
891 return;
892
893 g_blockEventsOnDrag = true;
894
895 g_signal_connect (m_widget, "drag_data_get",
896 G_CALLBACK (source_drag_data_get), this);
897 g_signal_connect (m_widget, "drag_end",
898 G_CALLBACK (source_drag_end), this);
899
900}
901
902void wxDropSource::GTKDisconnectDragSignals()
903{
904 if (!m_widget)
905 return;
906
907 g_blockEventsOnDrag = false;
908
909 g_signal_handlers_disconnect_by_func (m_widget,
910 (gpointer) source_drag_data_get,
911 this);
912 g_signal_handlers_disconnect_by_func (m_widget,
913 (gpointer) source_drag_end,
914 this);
915}
916
917#endif
918 // wxUSE_DRAG_AND_DROP
wxWidgets (Impactor)