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