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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#endif
24
25#include "wx/gdicmn.h"
26
27#include "wx/gtk/private.h"
28
29#include <gdk/gdkprivate.h>
30
31#include <gtk/gtkdnd.h>
32#include <gtk/gtkselection.h>
33
34//----------------------------------------------------------------------------
35// global data
36//----------------------------------------------------------------------------
37
38extern bool g_blockEventsOnDrag;
39
40// the flags used for the last DoDragDrop()
41static long gs_flagsForDrag = 0;
42
43// the trace mask we use with wxLogTrace() - call
44// wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
45// (there are quite a few of them, so don't enable this by default)
46static const wxChar *TRACE_DND = _T("dnd");
47
48//----------------------------------------------------------------------------
49// standard icons
50//----------------------------------------------------------------------------
51
52/* Copyright (c) Julian Smart */
53static const char * page_xpm[] = {
54/* columns rows colors chars-per-pixel */
55"32 32 37 1",
56"5 c #7198D9",
57", c #769CDA",
58"2 c #DCE6F6",
59"i c #FFFFFF",
60"e c #779DDB",
61": c #9AB6E4",
62"9 c #EAF0FA",
63"- c #B1C7EB",
64"$ c #6992D7",
65"y c #F7F9FD",
66"= c #BED0EE",
67"q c #F0F5FC",
68"; c #A8C0E8",
69"@ c #366BC2",
70" c None",
71"u c #FDFEFF",
72"8 c #5987D3",
73"* c #C4D5F0",
74"7 c #7CA0DC",
75"O c #487BCE",
76"< c #6B94D7",
77"& c #CCDAF2",
78"> c #89A9DF",
79"3 c #5584D1",
80"w c #82A5DE",
81"1 c #3F74CB",
82"+ c #3A70CA",
83". c #3569BF",
84"% c #D2DFF4",
85"# c #3366BB",
86"r c #F5F8FD",
87"0 c #FAFCFE",
88"4 c #DFE8F7",
89"X c #5E8AD4",
90"o c #5282D0",
91"t c #B8CCEC",
92"6 c #E5EDF9",
93/* pixels */
94" ",
95" ",
96" ",
97" ",
98" ",
99" .XXXooOO++@# ",
100" $%&*=-;::>,<1 ",
101" $2%&*=-;::><:3 ",
102" $42%&*=-;::<&:3 ",
103" 56477<<<<8<<9&:X ",
104" 59642%&*=-;<09&:5 ",
105" 5q9642%&*=-<<<<<# ",
106" 5qqw777<<<<<88:>+ ",
107" erqq9642%&*=t;::+ ",
108" eyrqq9642%&*=t;:O ",
109" eyywwww777<<<<t;O ",
110" e0yyrqq9642%&*=to ",
111" e00yyrqq9642%&*=o ",
112" eu0wwwwwww777<&*X ",
113" euu00yyrqq9642%&X ",
114" eiuu00yyrqq9642%X ",
115" eiiwwwwwwwwww742$ ",
116" eiiiuu00yyrqq964$ ",
117" eiiiiuu00yyrqq96$ ",
118" eiiiiiuu00yyrqq95 ",
119" eiiiiiiuu00yyrqq5 ",
120" eeeeeeeeeeeeee55e ",
121" ",
122" ",
123" ",
124" ",
125" "
126};
127
128
129// ============================================================================
130// private functions
131// ============================================================================
132
133// ----------------------------------------------------------------------------
134// convert between GTK+ and wxWidgets DND constants
135// ----------------------------------------------------------------------------
136
137static wxDragResult ConvertFromGTK(long action)
138{
139 switch ( action )
140 {
141 case GDK_ACTION_COPY:
142 return wxDragCopy;
143
144 case GDK_ACTION_LINK:
145 return wxDragLink;
146
147 case GDK_ACTION_MOVE:
148 return wxDragMove;
149 }
150
151 return wxDragNone;
152}
153
154// ----------------------------------------------------------------------------
155// "drag_leave"
156// ----------------------------------------------------------------------------
157
158extern "C" {
159static void target_drag_leave( GtkWidget *WXUNUSED(widget),
160 GdkDragContext *context,
161 guint WXUNUSED(time),
162 wxDropTarget *drop_target )
163{
164 if (g_isIdle) wxapp_install_idle_handler();
165
166 /* inform the wxDropTarget about the current GdkDragContext.
167 this is only valid for the duration of this call */
168 drop_target->SetDragContext( context );
169
170 /* we don't need return values. this event is just for
171 information */
172 drop_target->OnLeave();
173
174 /* this has to be done because GDK has no "drag_enter" event */
175 drop_target->m_firstMotion = true;
176
177 /* after this, invalidate the drop_target's GdkDragContext */
178 drop_target->SetDragContext( (GdkDragContext*) NULL );
179}
180}
181
182// ----------------------------------------------------------------------------
183// "drag_motion"
184// ----------------------------------------------------------------------------
185
186extern "C" {
187static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
188 GdkDragContext *context,
189 gint x,
190 gint y,
191 guint time,
192 wxDropTarget *drop_target )
193{
194 if (g_isIdle) wxapp_install_idle_handler();
195
196 /* Owen Taylor: "if the coordinates not in a drop zone,
197 return FALSE, otherwise call gtk_drag_status() and
198 return TRUE" */
199
200 /* inform the wxDropTarget about the current GdkDragContext.
201 this is only valid for the duration of this call */
202 drop_target->SetDragContext( context );
203
204 // GTK+ always supposes that we want to copy the data by default while we
205 // might want to move it, so examine not only suggested_action - which is
206 // only good if we don't have our own preferences - but also the actions
207 // field
208 wxDragResult result;
209 if (drop_target->GetDefaultAction() == wxDragNone)
210 {
211 // use default action set by wxDropSource::DoDragDrop()
212 if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
213 (context->actions & GDK_ACTION_MOVE ) )
214 {
215 // move is requested by the program and allowed by GTK+ - do it, even
216 // though suggested_action may be currently wxDragCopy
217 result = wxDragMove;
218 }
219 else // use whatever GTK+ says we should
220 {
221 result = ConvertFromGTK(context->suggested_action);
222
223 if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
224 {
225 // we're requested to move but we can't
226 result = wxDragCopy;
227 }
228 }
229 }
230 else if (drop_target->GetDefaultAction() == wxDragMove &&
231 (context->actions & GDK_ACTION_MOVE))
232 {
233 result = wxDragMove;
234 }
235 else
236 {
237 if (context->actions & GDK_ACTION_COPY)
238 result = wxDragCopy;
239 else if (context->actions & GDK_ACTION_MOVE)
240 result = wxDragMove;
241 else
242 result = wxDragNone;
243 }
244
245 if (drop_target->m_firstMotion)
246 {
247 /* the first "drag_motion" event substitutes a "drag_enter" event */
248 result = drop_target->OnEnter( x, y, result );
249 }
250 else
251 {
252 /* give program a chance to react (i.e. to say no by returning FALSE) */
253 result = drop_target->OnDragOver( x, y, result );
254 }
255
256 bool ret = wxIsDragResultOk( result );
257 if (ret)
258 {
259 GdkDragAction action;
260 if (result == wxDragCopy)
261 action = GDK_ACTION_COPY;
262 else if (result == wxDragLink)
263 action = GDK_ACTION_LINK;
264 else
265 action = GDK_ACTION_MOVE;
266
267 gdk_drag_status( context, action, time );
268 }
269
270 /* after this, invalidate the drop_target's GdkDragContext */
271 drop_target->SetDragContext( (GdkDragContext*) NULL );
272
273 /* this has to be done because GDK has no "drag_enter" event */
274 drop_target->m_firstMotion = false;
275
276 return ret;
277}
278}
279
280// ----------------------------------------------------------------------------
281// "drag_drop"
282// ----------------------------------------------------------------------------
283
284extern "C" {
285static gboolean target_drag_drop( GtkWidget *widget,
286 GdkDragContext *context,
287 gint x,
288 gint y,
289 guint time,
290 wxDropTarget *drop_target )
291{
292 if (g_isIdle) wxapp_install_idle_handler();
293
294 /* Owen Taylor: "if the drop is not in a drop zone,
295 return FALSE, otherwise, if you aren't accepting
296 the drop, call gtk_drag_finish() with success == FALSE
297 otherwise call gtk_drag_data_get()" */
298
299// printf( "drop.\n" );
300
301 /* this seems to make a difference between not accepting
302 due to wrong target area and due to wrong format. let
303 us hope that this is not required.. */
304
305 /* inform the wxDropTarget about the current GdkDragContext.
306 this is only valid for the duration of this call */
307 drop_target->SetDragContext( context );
308
309 /* inform the wxDropTarget about the current drag widget.
310 this is only valid for the duration of this call */
311 drop_target->SetDragWidget( widget );
312
313 /* inform the wxDropTarget about the current drag time.
314 this is only valid for the duration of this call */
315 drop_target->SetDragTime( time );
316
317/*
318 wxDragResult result = wxDragMove;
319 if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
320*/
321
322 /* reset the block here as someone might very well
323 show a dialog as a reaction to a drop and this
324 wouldn't work without events */
325 g_blockEventsOnDrag = false;
326
327 bool ret = drop_target->OnDrop( x, y );
328
329 if (!ret)
330 {
331 wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
332
333 /* cancel the whole thing */
334 gtk_drag_finish( context,
335 FALSE, /* no success */
336 FALSE, /* don't delete data on dropping side */
337 time );
338 }
339 else
340 {
341 wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned true") );
342
343#if wxUSE_THREADS
344 /* disable GUI threads */
345#endif
346
347 GdkAtom format = drop_target->GetMatchingPair();
348
349 // this does happen somehow, see bug 555111
350 wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") );
351
352/*
353 GdkDragAction action = GDK_ACTION_MOVE;
354 if (result == wxDragCopy) action == GDK_ACTION_COPY;
355 context->action = action;
356*/
357 /* this should trigger an "drag_data_received" event */
358 gtk_drag_get_data( widget,
359 context,
360 format,
361 time );
362
363#if wxUSE_THREADS
364 /* re-enable GUI threads */
365#endif
366 }
367
368 /* after this, invalidate the drop_target's GdkDragContext */
369 drop_target->SetDragContext( (GdkDragContext*) NULL );
370
371 /* after this, invalidate the drop_target's drag widget */
372 drop_target->SetDragWidget( (GtkWidget*) NULL );
373
374 /* this has to be done because GDK has no "drag_enter" event */
375 drop_target->m_firstMotion = true;
376
377 return ret;
378}
379}
380
381// ----------------------------------------------------------------------------
382// "drag_data_received"
383// ----------------------------------------------------------------------------
384
385extern "C" {
386static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
387 GdkDragContext *context,
388 gint x,
389 gint y,
390 GtkSelectionData *data,
391 guint WXUNUSED(info),
392 guint time,
393 wxDropTarget *drop_target )
394{
395 if (g_isIdle) wxapp_install_idle_handler();
396
397 /* Owen Taylor: "call gtk_drag_finish() with
398 success == TRUE" */
399
400 if ((data->length <= 0) || (data->format != 8))
401 {
402 /* negative data length and non 8-bit data format
403 qualifies for junk */
404 gtk_drag_finish (context, FALSE, FALSE, time);
405
406 return;
407 }
408
409 wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
410
411 /* inform the wxDropTarget about the current GtkSelectionData.
412 this is only valid for the duration of this call */
413 drop_target->SetDragData( data );
414
415 wxDragResult result = ConvertFromGTK(context->action);
416
417 if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
418 {
419 wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned true") );
420
421 /* tell GTK that data transfer was successful */
422 gtk_drag_finish( context, TRUE, FALSE, time );
423 }
424 else
425 {
426 wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
427
428 /* tell GTK that data transfer was not successful */
429 gtk_drag_finish( context, FALSE, FALSE, time );
430 }
431
432 /* after this, invalidate the drop_target's drag data */
433 drop_target->SetDragData( (GtkSelectionData*) NULL );
434}
435}
436
437//----------------------------------------------------------------------------
438// wxDropTarget
439//----------------------------------------------------------------------------
440
441wxDropTarget::wxDropTarget( wxDataObject *data )
442 : wxDropTargetBase( data )
443{
444 m_firstMotion = true;
445 m_dragContext = (GdkDragContext*) NULL;
446 m_dragWidget = (GtkWidget*) NULL;
447 m_dragData = (GtkSelectionData*) NULL;
448 m_dragTime = 0;
449}
450
451wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
452 wxCoord WXUNUSED(y),
453 wxDragResult def )
454{
455 // GetMatchingPair() checks for m_dataObject too, no need to do it here
456
457 // disable the debug message from GetMatchingPair() - there are too many
458 // of them otherwise
459#ifdef __WXDEBUG__
460 wxLogNull noLog;
461#endif // Debug
462
463 return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
464}
465
466bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
467{
468 if (!m_dataObject)
469 return false;
470
471 return (GetMatchingPair() != (GdkAtom) 0);
472}
473
474wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
475 wxDragResult def )
476{
477 if (!m_dataObject)
478 return wxDragNone;
479
480 if (GetMatchingPair() == (GdkAtom) 0)
481 return wxDragNone;
482
483 return GetData() ? def : wxDragNone;
484}
485
486GdkAtom wxDropTarget::GetMatchingPair()
487{
488 if (!m_dataObject)
489 return (GdkAtom) 0;
490
491 if (!m_dragContext)
492 return (GdkAtom) 0;
493
494 GList *child = m_dragContext->targets;
495 while (child)
496 {
497 GdkAtom formatAtom = (GdkAtom)(child->data);
498 wxDataFormat format( formatAtom );
499
500#ifdef __WXDEBUG__
501 wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
502 format.GetId().c_str());
503#endif // Debug
504
505 if (m_dataObject->IsSupportedFormat( format ))
506 return formatAtom;
507
508 child = child->next;
509 }
510
511 return (GdkAtom) 0;
512}
513
514bool wxDropTarget::GetData()
515{
516 if (!m_dragData)
517 return false;
518
519 if (!m_dataObject)
520 return false;
521
522 wxDataFormat dragFormat( m_dragData->target );
523
524 if (!m_dataObject->IsSupportedFormat( dragFormat ))
525 return false;
526
527 m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
528
529 return true;
530}
531
532void wxDropTarget::UnregisterWidget( GtkWidget *widget )
533{
534 wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
535
536 gtk_drag_dest_unset( widget );
537
538 g_signal_handlers_disconnect_by_func (widget,
539 (gpointer) target_drag_leave, this);
540 g_signal_handlers_disconnect_by_func (widget,
541 (gpointer) target_drag_motion, this);
542 g_signal_handlers_disconnect_by_func (widget,
543 (gpointer) target_drag_drop, this);
544 g_signal_handlers_disconnect_by_func (widget,
545 (gpointer) target_drag_data_received, this);
546}
547
548void wxDropTarget::RegisterWidget( GtkWidget *widget )
549{
550 wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
551
552 /* gtk_drag_dest_set() determines what default behaviour we'd like
553 GTK to supply. we don't want to specify out targets (=formats)
554 or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
555 not GTK_DEST_DEFAULT_DROP). instead we react individually to
556 "drag_motion" and "drag_drop" events. this makes it possible
557 to allow dropping on only a small area. we should set
558 GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
559 highlighting if dragging over standard controls, but this
560 seems to be broken without the other two. */
561
562 gtk_drag_dest_set( widget,
563 (GtkDestDefaults) 0, /* no default behaviour */
564 (GtkTargetEntry*) NULL, /* we don't supply any formats here */
565 0, /* number of targets = 0 */
566 (GdkDragAction) 0 ); /* we don't supply any actions here */
567
568 g_signal_connect (widget, "drag_leave",
569 G_CALLBACK (target_drag_leave), this);
570
571 g_signal_connect (widget, "drag_motion",
572 G_CALLBACK (target_drag_motion), this);
573
574 g_signal_connect (widget, "drag_drop",
575 G_CALLBACK (target_drag_drop), this);
576
577 g_signal_connect (widget, "drag_data_received",
578 G_CALLBACK (target_drag_data_received), this);
579}
580
581//----------------------------------------------------------------------------
582// "drag_data_get"
583//----------------------------------------------------------------------------
584
585extern "C" {
586static void
587source_drag_data_get (GtkWidget *WXUNUSED(widget),
588 GdkDragContext *WXUNUSED(context),
589 GtkSelectionData *selection_data,
590 guint WXUNUSED(info),
591 guint WXUNUSED(time),
592 wxDropSource *drop_source )
593{
594 if (g_isIdle) wxapp_install_idle_handler();
595
596 wxDataFormat format( selection_data->target );
597
598 wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
599 format.GetId().c_str());
600
601 drop_source->m_retValue = wxDragCancel;
602
603 wxDataObject *data = drop_source->GetDataObject();
604
605 if (!data)
606 {
607 wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
608 return;
609 }
610
611 if (!data->IsSupportedFormat(format))
612 {
613 wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
614 return;
615 }
616
617 if (data->GetDataSize(format) == 0)
618 {
619 wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
620 return;
621 }
622
623 size_t size = data->GetDataSize(format);
624
625// printf( "data size: %d.\n", (int)data_size );
626
627 guchar *d = new guchar[size];
628
629 if (!data->GetDataHere( format, (void*)d ))
630 {
631 delete[] d;
632 return;
633 }
634
635#if wxUSE_THREADS
636 /* disable GUI threads */
637#endif
638
639 gtk_selection_data_set( selection_data,
640 selection_data->target,
641 8, // 8-bit
642 d,
643 size );
644
645#if wxUSE_THREADS
646 /* enable GUI threads */
647#endif
648
649 delete[] d;
650}
651}
652
653//----------------------------------------------------------------------------
654// "drag_data_delete"
655//----------------------------------------------------------------------------
656
657extern "C" {
658static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
659 GdkDragContext *context,
660 wxDropSource *WXUNUSED(drop_source) )
661{
662 if (g_isIdle)
663 wxapp_install_idle_handler();
664
665 // printf( "Drag source: drag_data_delete\n" );
666}
667}
668
669//----------------------------------------------------------------------------
670// "drag_begin"
671//----------------------------------------------------------------------------
672
673extern "C" {
674static void source_drag_begin( GtkWidget *WXUNUSED(widget),
675 GdkDragContext *WXUNUSED(context),
676 wxDropSource *WXUNUSED(drop_source) )
677{
678 if (g_isIdle)
679 wxapp_install_idle_handler();
680
681 // printf( "Drag source: drag_begin.\n" );
682}
683}
684
685//----------------------------------------------------------------------------
686// "drag_end"
687//----------------------------------------------------------------------------
688
689extern "C" {
690static void source_drag_end( GtkWidget *WXUNUSED(widget),
691 GdkDragContext *WXUNUSED(context),
692 wxDropSource *drop_source )
693{
694 if (g_isIdle) wxapp_install_idle_handler();
695
696 // printf( "Drag source: drag_end.\n" );
697
698 drop_source->m_waiting = false;
699}
700}
701
702//-----------------------------------------------------------------------------
703// "configure_event" from m_iconWindow
704//-----------------------------------------------------------------------------
705
706extern "C" {
707static gint
708gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
709{
710 if (g_isIdle)
711 wxapp_install_idle_handler();
712
713 source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
714
715 return 0;
716}
717}
718
719//---------------------------------------------------------------------------
720// wxDropSource
721//---------------------------------------------------------------------------
722
723wxDropSource::wxDropSource(wxWindow *win,
724 const wxIcon &iconCopy,
725 const wxIcon &iconMove,
726 const wxIcon &iconNone)
727{
728 m_waiting = true;
729
730 m_iconWindow = (GtkWidget*) NULL;
731
732 m_window = win;
733 m_widget = win->m_widget;
734 if (win->m_wxwindow) m_widget = win->m_wxwindow;
735
736 m_retValue = wxDragCancel;
737
738 SetIcons(iconCopy, iconMove, iconNone);
739}
740
741wxDropSource::wxDropSource(wxDataObject& data,
742 wxWindow *win,
743 const wxIcon &iconCopy,
744 const wxIcon &iconMove,
745 const wxIcon &iconNone)
746{
747 m_waiting = true;
748
749 SetData( data );
750
751 m_iconWindow = (GtkWidget*) NULL;
752
753 m_window = win;
754 m_widget = win->m_widget;
755 if (win->m_wxwindow) m_widget = win->m_wxwindow;
756
757 m_retValue = wxDragCancel;
758
759 SetIcons(iconCopy, iconMove, iconNone);
760}
761
762void wxDropSource::SetIcons(const wxIcon &iconCopy,
763 const wxIcon &iconMove,
764 const wxIcon &iconNone)
765{
766 m_iconCopy = iconCopy;
767 m_iconMove = iconMove;
768 m_iconNone = iconNone;
769
770 if ( !m_iconCopy.Ok() )
771 m_iconCopy = wxIcon(page_xpm);
772 if ( !m_iconMove.Ok() )
773 m_iconMove = m_iconCopy;
774 if ( !m_iconNone.Ok() )
775 m_iconNone = m_iconCopy;
776}
777
778wxDropSource::~wxDropSource()
779{
780}
781
782void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
783{
784 // get the right icon to display
785 wxIcon *icon = NULL;
786 if ( action & GDK_ACTION_MOVE )
787 icon = &m_iconMove;
788 else if ( action & GDK_ACTION_COPY )
789 icon = &m_iconCopy;
790 else
791 icon = &m_iconNone;
792
793 GdkBitmap *mask;
794 if ( icon->GetMask() )
795 mask = icon->GetMask()->GetBitmap();
796 else
797 mask = (GdkBitmap *)NULL;
798
799 GdkPixmap *pixmap = icon->GetPixmap();
800
801 gint width,height;
802 gdk_drawable_get_size (pixmap, &width, &height);
803
804 GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
805 gtk_widget_push_colormap (colormap);
806
807 m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
808 gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
809 gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
810
811 gtk_widget_pop_colormap ();
812
813 gtk_widget_set_size_request (m_iconWindow, width, height);
814 gtk_widget_realize (m_iconWindow);
815
816 g_signal_connect (m_iconWindow, "configure_event",
817 G_CALLBACK (gtk_dnd_window_configure_callback), this);
818
819 gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
820
821 if (mask)
822 gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
823
824 gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
825}
826
827wxDragResult wxDropSource::DoDragDrop(int flags)
828{
829 wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
830 wxT("Drop source: no data") );
831
832 // still in drag
833 if (g_blockEventsOnDrag)
834 return wxDragNone;
835
836 // disabled for now
837 g_blockEventsOnDrag = true;
838
839 RegisterWindow();
840
841 m_waiting = true;
842
843 GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
844
845 wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
846 m_data->GetAllFormats( array );
847 size_t count = m_data->GetFormatCount();
848 for (size_t i = 0; i < count; i++)
849 {
850 GdkAtom atom = array[i];
851 wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
852 gtk_target_list_add( target_list, atom, 0, 0 );
853 }
854 delete[] array;
855
856 GdkEventMotion event;
857 event.window = m_widget->window;
858 int x = 0;
859 int y = 0;
860 GdkModifierType state;
861 gdk_window_get_pointer( event.window, &x, &y, &state );
862 event.x = x;
863 event.y = y;
864 event.state = state;
865 event.time = (guint32)GDK_CURRENT_TIME;
866
867 /* GTK wants to know which button was pressed which caused the dragging */
868 int button_number = 0;
869 if (event.state & GDK_BUTTON1_MASK) button_number = 1;
870 else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
871 else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
872
873#if wxUSE_THREADS
874 /* disable GUI threads */
875#endif
876
877 /* don't start dragging if no button is down */
878 if (button_number)
879 {
880 int action = GDK_ACTION_COPY;
881 if ( flags & wxDrag_AllowMove )
882 action |= GDK_ACTION_MOVE;
883
884 // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
885 // to use a global to pass the flags to the drop target but I'd
886 // surely prefer a better way to do it
887 gs_flagsForDrag = flags;
888
889 GdkDragContext *context = gtk_drag_begin( m_widget,
890 target_list,
891 (GdkDragAction)action,
892 button_number, /* number of mouse button which started drag */
893 (GdkEvent*) &event );
894
895 m_dragContext = context;
896
897 PrepareIcon( action, context );
898
899 while (m_waiting)
900 gtk_main_iteration();
901
902 m_retValue = ConvertFromGTK(context->action);
903 if ( m_retValue == wxDragNone )
904 m_retValue = wxDragCancel;
905 }
906
907#if wxUSE_THREADS
908 /* re-enable GUI threads */
909#endif
910
911 g_blockEventsOnDrag = false;
912
913 UnregisterWindow();
914
915 return m_retValue;
916}
917
918void wxDropSource::RegisterWindow()
919{
920 if (!m_widget) return;
921
922 g_signal_connect (m_widget, "drag_data_get",
923 G_CALLBACK (source_drag_data_get), this);
924 g_signal_connect (m_widget, "drag_data_delete",
925 G_CALLBACK (source_drag_data_delete), this);
926 g_signal_connect (m_widget, "drag_begin",
927 G_CALLBACK (source_drag_begin), this);
928 g_signal_connect (m_widget, "drag_end",
929 G_CALLBACK (source_drag_end), this);
930
931}
932
933void wxDropSource::UnregisterWindow()
934{
935 if (!m_widget)
936 return;
937
938 g_signal_handlers_disconnect_by_func (m_widget,
939 (gpointer) source_drag_data_get,
940 this);
941 g_signal_handlers_disconnect_by_func (m_widget,
942 (gpointer) source_drag_data_delete,
943 this);
944 g_signal_handlers_disconnect_by_func (m_widget,
945 (gpointer) source_drag_begin,
946 this);
947 g_signal_handlers_disconnect_by_func (m_widget,
948 (gpointer) source_drag_end,
949 this);
950}
951
952#endif
953 // wxUSE_DRAG_AND_DROP
wxWidgets (Impactor)