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Corrected small mistake (set static variable)
[wxWidgets.git] / src / gtk / dnd.cpp
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1///////////////////////////////////////////////////////////////////////////////
2// Name: 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#ifdef __GNUG__
11#pragma implementation "dnd.h"
12#endif
13
14#include "wx/dnd.h"
15
16#if wxUSE_DRAG_AND_DROP
17
18#include "wx/window.h"
19#include "wx/app.h"
20#include "wx/gdicmn.h"
21#include "wx/intl.h"
22#include "wx/utils.h"
23
24#include "gdk/gdk.h"
25#include "gtk/gtk.h"
26#include "gdk/gdkprivate.h"
27
28#include "gtk/gtkdnd.h"
29#include "gtk/gtkselection.h"
30
31//-----------------------------------------------------------------------------
32// idle system
33//-----------------------------------------------------------------------------
34
35extern void wxapp_install_idle_handler();
36extern bool g_isIdle;
37
38//-----------------------------------------------------------------------------
39// thread system
40//-----------------------------------------------------------------------------
41
42#if wxUSE_THREADS
43extern void wxapp_install_thread_wakeup();
44extern void wxapp_uninstall_thread_wakeup();
45#endif
46
47//----------------------------------------------------------------------------
48// global data
49//----------------------------------------------------------------------------
50
51extern bool g_blockEventsOnDrag;
52
53//----------------------------------------------------------------------------
54// standard icons
55//----------------------------------------------------------------------------
56
57/* XPM */
58static char * page_xpm[] = {
59/* width height ncolors chars_per_pixel */
60"32 32 5 1",
61/* colors */
62" s None c None",
63". c black",
64"X c wheat",
65"o c tan",
66"O c #6699FF",
67/* pixels */
68" ................... ",
69" .XXXXXXXXXXXXXXXXX.. ",
70" .XXXXXXXXXXXXXXXXX.o. ",
71" .XXXXXXXXXXXXXXXXX.oo. ",
72" .XXXXXXXXXXXXXXXXX.ooo. ",
73" .XXXXXXXXXXXXXXXXX.oooo. ",
74" .XXXXXXXXXXXXXXXXX....... ",
75" .XXXXXOOOOOOOOOOXXXooooo. ",
76" .XXXXXXXXXXXXXXXXXXooooo. ",
77" .XXXXXOOOOOOOOOOXXXXXXXX. ",
78" .XXXXXXXXXXXXXXXXXXXXXXX. ",
79" .XXXXXXXOOOOOOOOOXXXXXXX. ",
80" .XXXXXXXXXXXXXXXXXXXXXXX. ",
81" .XXXXXXOOOOOOOOOOXXXXXXX. ",
82" .XXXXXXXXXXXXXXXXXXXXXXX. ",
83" .XXXXXOOOOOOOOOOXXXXXXXX. ",
84" .XXXXXXXXXXXXXXXXXXXXXXX. ",
85" .XXXXXXXOOOOOOOOOXXXXXXX. ",
86" .XXXXXXXXXXXXXXXXXXXXXXX. ",
87" .XXXXXXOOOOOOOOOOXXXXXXX. ",
88" .XXXXXXXXXXXXXXXXXXXXXXX. ",
89" .XXXXXOOOOOOOOOOXXXXXXXX. ",
90" .XXXXXXXXXXXXXXXXXXXXXXX. ",
91" .XXXXXXOOOOOOOOOOXXXXXXX. ",
92" .XXXXXXXXXXXXXXXXXXXXXXX. ",
93" .XXXXXOOOOOOOXXXXXXXXXXX. ",
94" .XXXXXXXXXXXXXXXXXXXXXXX. ",
95" .XXXXXXXXXXXXXXXXXXXXXXX. ",
96" .XXXXXXXXXXXXXXXXXXXXXXX. ",
97" .XXXXXXXXXXXXXXXXXXXXXXX. ",
98" .XXXXXXXXXXXXXXXXXXXXXXX. ",
99" ......................... "};
100
101
102
103// ----------------------------------------------------------------------------
104// "drag_leave"
105// ----------------------------------------------------------------------------
106
107static void target_drag_leave( GtkWidget *WXUNUSED(widget),
108 GdkDragContext *context,
109 guint WXUNUSED(time),
110 wxDropTarget *drop_target )
111{
112 if (g_isIdle) wxapp_install_idle_handler();
113
114 /* inform the wxDropTarget about the current GdkDragContext.
115 this is only valid for the duration of this call */
116 drop_target->SetDragContext( context );
117
118 /* we don't need return values. this event is just for
119 information */
120 drop_target->OnLeave();
121
122 /* this has to be done because GDK has no "drag_enter" event */
123 drop_target->m_firstMotion = TRUE;
124
125 /* after this, invalidate the drop_target's GdkDragContext */
126 drop_target->SetDragContext( (GdkDragContext*) NULL );
127}
128
129// ----------------------------------------------------------------------------
130// "drag_motion"
131// ----------------------------------------------------------------------------
132
133static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
134 GdkDragContext *context,
135 gint x,
136 gint y,
137 guint time,
138 wxDropTarget *drop_target )
139{
140 if (g_isIdle) wxapp_install_idle_handler();
141
142 /* Owen Taylor: "if the coordinates not in a drop zone,
143 return FALSE, otherwise call gtk_drag_status() and
144 return TRUE" */
145
146 /* inform the wxDropTarget about the current GdkDragContext.
147 this is only valid for the duration of this call */
148 drop_target->SetDragContext( context );
149
150 wxDragResult result;
151 if ( context->suggested_action == GDK_ACTION_COPY )
152 result = wxDragCopy;
153 else
154 result = wxDragMove;
155
156 if (drop_target->m_firstMotion)
157 {
158 /* the first "drag_motion" event substitutes a "drag_enter" event */
159 result = drop_target->OnEnter( x, y, result );
160 }
161 else
162 {
163 /* give program a chance to react (i.e. to say no by returning FALSE) */
164 result = drop_target->OnDragOver( x, y, result );
165 }
166
167 bool ret = wxIsDragResultOk( result );
168 if (ret)
169 {
170 GdkDragAction action;
171 if (result == wxDragCopy)
172 action = GDK_ACTION_COPY;
173 else
174 action = GDK_ACTION_MOVE;
175
176 gdk_drag_status( context, action, time );
177 }
178
179 /* after this, invalidate the drop_target's GdkDragContext */
180 drop_target->SetDragContext( (GdkDragContext*) NULL );
181
182 /* this has to be done because GDK has no "drag_enter" event */
183 drop_target->m_firstMotion = FALSE;
184
185 return ret;
186}
187
188// ----------------------------------------------------------------------------
189// "drag_drop"
190// ----------------------------------------------------------------------------
191
192static gboolean target_drag_drop( GtkWidget *widget,
193 GdkDragContext *context,
194 gint x,
195 gint y,
196 guint time,
197 wxDropTarget *drop_target )
198{
199 if (g_isIdle) wxapp_install_idle_handler();
200
201 /* Owen Taylor: "if the drop is not in a drop zone,
202 return FALSE, otherwise, if you aren't accepting
203 the drop, call gtk_drag_finish() with success == FALSE
204 otherwise call gtk_drag_data_get()" */
205
206// printf( "drop.\n" );
207
208 /* this seems to make a difference between not accepting
209 due to wrong target area and due to wrong format. let
210 us hope that this is not required.. */
211
212 /* inform the wxDropTarget about the current GdkDragContext.
213 this is only valid for the duration of this call */
214 drop_target->SetDragContext( context );
215
216 /* inform the wxDropTarget about the current drag widget.
217 this is only valid for the duration of this call */
218 drop_target->SetDragWidget( widget );
219
220 /* inform the wxDropTarget about the current drag time.
221 this is only valid for the duration of this call */
222 drop_target->SetDragTime( time );
223
224/*
225 wxDragResult result = wxDragMove;
226 if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
227*/
228
229 bool ret = drop_target->OnDrop( x, y );
230
231 if (!ret)
232 {
233 wxLogDebug( wxT( "Drop target: OnDrop returned TRUE") );
234
235 /* cancel the whole thing */
236 gtk_drag_finish( context,
237 FALSE, /* no success */
238 FALSE, /* don't delete data on dropping side */
239 time );
240 }
241 else
242 {
243 wxLogDebug( wxT( "Drop target: OnDrop returned TRUE") );
244
245#if wxUSE_THREADS
246 /* disable GUI threads */
247 wxapp_uninstall_thread_wakeup();
248#endif
249
250 GdkAtom format = drop_target->GetMatchingPair();
251 wxASSERT( format );
252
253/*
254 GdkDragAction action = GDK_ACTION_MOVE;
255 if (result == wxDragCopy) action == GDK_ACTION_COPY;
256 context->action = action;
257*/
258 /* this should trigger an "drag_data_received" event */
259 gtk_drag_get_data( widget,
260 context,
261 format,
262 time );
263
264#if wxUSE_THREADS
265 /* re-enable GUI threads */
266 wxapp_install_thread_wakeup();
267#endif
268 }
269
270 /* after this, invalidate the drop_target's GdkDragContext */
271 drop_target->SetDragContext( (GdkDragContext*) NULL );
272
273 /* after this, invalidate the drop_target's drag widget */
274 drop_target->SetDragWidget( (GtkWidget*) NULL );
275
276 /* this has to be done because GDK has no "drag_enter" event */
277 drop_target->m_firstMotion = TRUE;
278
279 return ret;
280}
281
282// ----------------------------------------------------------------------------
283// "drag_data_received"
284// ----------------------------------------------------------------------------
285
286static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
287 GdkDragContext *context,
288 gint x,
289 gint y,
290 GtkSelectionData *data,
291 guint WXUNUSED(info),
292 guint time,
293 wxDropTarget *drop_target )
294{
295 if (g_isIdle) wxapp_install_idle_handler();
296
297 /* Owen Taylor: "call gtk_drag_finish() with
298 success == TRUE" */
299
300 if ((data->length <= 0) || (data->format != 8))
301 {
302 /* negative data length and non 8-bit data format
303 qualifies for junk */
304 gtk_drag_finish (context, FALSE, FALSE, time);
305
306 return;
307 }
308
309 wxLogDebug( wxT( "Drop target: data received event") );
310
311 /* inform the wxDropTarget about the current GtkSelectionData.
312 this is only valid for the duration of this call */
313 drop_target->SetDragData( data );
314
315 wxDragResult result;
316 if ( context->suggested_action == GDK_ACTION_COPY )
317 result = wxDragCopy;
318 else
319 result = wxDragMove;
320
321 if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
322 {
323 wxLogDebug( wxT( "Drop target: OnData returned TRUE") );
324
325 /* tell GTK that data transfer was successfull */
326 gtk_drag_finish( context, TRUE, FALSE, time );
327 }
328 else
329 {
330 wxLogDebug( wxT( "Drop target: OnData returned FALSE") );
331
332 /* tell GTK that data transfer was not successfull */
333 gtk_drag_finish( context, FALSE, FALSE, time );
334 }
335
336 /* after this, invalidate the drop_target's drag data */
337 drop_target->SetDragData( (GtkSelectionData*) NULL );
338}
339
340//----------------------------------------------------------------------------
341// wxDropTarget
342//----------------------------------------------------------------------------
343
344wxDropTarget::wxDropTarget( wxDataObject *data )
345 : wxDropTargetBase( data )
346{
347 m_firstMotion = TRUE;
348 m_dragContext = (GdkDragContext*) NULL;
349 m_dragWidget = (GtkWidget*) NULL;
350 m_dragData = (GtkSelectionData*) NULL;
351 m_dragTime = 0;
352}
353
354wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
355 wxCoord WXUNUSED(y),
356 wxDragResult def )
357{
358 // GetMatchingPair() checks for m_dataObject too, no need to do it here
359
360 // disable the debug message from GetMatchingPair() - there are too many
361 // of them otherwise
362#ifdef __WXDEBUG__
363 wxLogNull noLog;
364#endif // Debug
365
366 return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
367}
368
369bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
370{
371 if (!m_dataObject)
372 return FALSE;
373
374 return (GetMatchingPair() != (GdkAtom) 0);
375}
376
377wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
378 wxDragResult def )
379{
380 if (!m_dataObject)
381 return wxDragNone;
382
383 if (GetMatchingPair() == (GdkAtom) 0)
384 return wxDragNone;
385
386 return GetData() ? def : wxDragNone;
387}
388
389GdkAtom wxDropTarget::GetMatchingPair()
390{
391 if (!m_dataObject)
392 return (GdkAtom) 0;
393
394 if (!m_dragContext)
395 return (GdkAtom) 0;
396
397 GList *child = m_dragContext->targets;
398 while (child)
399 {
400 GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
401 wxDataFormat format( formatAtom );
402
403#ifdef __WXDEBUG__
404 wxLogDebug("Drop target: drag has format: %s", format.GetId().c_str() );
405#endif // Debug
406
407 if (m_dataObject->IsSupportedFormat( format ))
408 return formatAtom;
409
410 child = child->next;
411 }
412
413 return (GdkAtom) 0;
414}
415
416bool wxDropTarget::GetData()
417{
418 if (!m_dragData)
419 return FALSE;
420
421 if (!m_dataObject)
422 return FALSE;
423
424 wxDataFormat dragFormat( m_dragData->target );
425
426 if (!m_dataObject->IsSupportedFormat( dragFormat ))
427 return FALSE;
428
429 if (dragFormat.GetType() == wxDF_TEXT)
430 {
431 wxTextDataObject *text_object = (wxTextDataObject*)m_dataObject;
432 text_object->SetText( (const char*)m_dragData->data );
433 return TRUE;
434 }
435
436 if (dragFormat.GetType() == wxDF_FILENAME)
437 {
438 wxFileDataObject *file_object = (wxFileDataObject*)m_dataObject;
439 file_object->SetData( 0, (const char*)m_dragData->data );
440 return TRUE;
441 }
442
443 m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
444
445 return TRUE;
446}
447
448void wxDropTarget::UnregisterWidget( GtkWidget *widget )
449{
450 wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
451
452 gtk_drag_dest_unset( widget );
453
454 gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
455 GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
456
457 gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
458 GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
459
460 gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
461 GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
462
463 gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
464 GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
465}
466
467void wxDropTarget::RegisterWidget( GtkWidget *widget )
468{
469 wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
470
471 /* gtk_drag_dest_set() determines what default behaviour we'd like
472 GTK to supply. we don't want to specify out targets (=formats)
473 or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
474 not GTK_DEST_DEFAULT_DROP). instead we react individually to
475 "drag_motion" and "drag_drop" events. this makes it possible
476 to allow dropping on only a small area. we should set
477 GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
478 highlighting if dragging over standard controls, but this
479 seems to be broken without the other two. */
480
481 gtk_drag_dest_set( widget,
482 (GtkDestDefaults) 0, /* no default behaviour */
483 (GtkTargetEntry*) NULL, /* we don't supply any formats here */
484 0, /* number of targets = 0 */
485 (GdkDragAction) 0 ); /* we don't supply any actions here */
486
487 gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
488 GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
489
490 gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
491 GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
492
493 gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
494 GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
495
496 gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
497 GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
498}
499
500//----------------------------------------------------------------------------
501// "drag_data_get"
502//----------------------------------------------------------------------------
503
504static void
505source_drag_data_get (GtkWidget *WXUNUSED(widget),
506 GdkDragContext *context,
507 GtkSelectionData *selection_data,
508 guint WXUNUSED(info),
509 guint WXUNUSED(time),
510 wxDropSource *drop_source )
511{
512 if (g_isIdle) wxapp_install_idle_handler();
513
514 wxDataFormat format( selection_data->target );
515
516 wxLogDebug( wxT("Drop source: format requested: %s"), format.GetId().c_str() );
517
518 drop_source->m_retValue = wxDragCancel;
519
520 wxDataObject *data = drop_source->GetDataObject();
521
522 if (!data)
523 {
524 wxLogDebug( wxT("Drop source: no data object") );
525 return;
526 }
527
528 if (!data->IsSupportedFormat(format))
529 {
530 wxLogDebug( wxT("Drop source: unsupported format") );
531 return;
532 }
533
534 if (data->GetDataSize(format) == 0)
535 {
536 wxLogDebug( wxT("Drop source: empty data") );
537 return;
538 }
539
540 size_t size = data->GetDataSize(format);
541
542// printf( "data size: %d.\n", (int)data_size );
543
544 guchar *d = new guchar[size];
545
546 if (!data->GetDataHere( format, (void*)d ))
547 {
548 delete[] d;
549 return;
550 }
551
552#if wxUSE_THREADS
553 /* disable GUI threads */
554 wxapp_uninstall_thread_wakeup();
555#endif
556
557 gtk_selection_data_set( selection_data,
558 selection_data->target,
559 8, // 8-bit
560 d,
561 size );
562
563#if wxUSE_THREADS
564 /* enable GUI threads */
565 wxapp_install_thread_wakeup();
566#endif
567
568 delete[] d;
569
570 /* so far only copy, no moves. TODO. */
571 drop_source->m_retValue = wxDragCopy;
572}
573
574//----------------------------------------------------------------------------
575// "drag_data_delete"
576//----------------------------------------------------------------------------
577
578static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
579 GdkDragContext *WXUNUSED(context),
580 wxDropSource *drop_source )
581{
582 if (g_isIdle) wxapp_install_idle_handler();
583
584// printf( "Delete the data!\n" );
585
586 drop_source->m_retValue = wxDragMove;
587}
588
589//----------------------------------------------------------------------------
590// "drag_begin"
591//----------------------------------------------------------------------------
592
593static void source_drag_begin( GtkWidget *WXUNUSED(widget),
594 GdkDragContext *WXUNUSED(context),
595 wxDropSource *WXUNUSED(drop_source) )
596{
597 if (g_isIdle) wxapp_install_idle_handler();
598
599// printf( "drag_begin.\n" );
600}
601
602//----------------------------------------------------------------------------
603// "drag_end"
604//----------------------------------------------------------------------------
605
606static void source_drag_end( GtkWidget *WXUNUSED(widget),
607 GdkDragContext *WXUNUSED(context),
608 wxDropSource *drop_source )
609{
610 if (g_isIdle) wxapp_install_idle_handler();
611
612// printf( "drag_end.\n" );
613
614 drop_source->m_waiting = FALSE;
615}
616
617//-----------------------------------------------------------------------------
618// "configure_event" from m_iconWindow
619//-----------------------------------------------------------------------------
620
621static gint
622gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
623{
624 if (g_isIdle)
625 wxapp_install_idle_handler();
626
627 wxDragResult action = wxDragNone;
628 if (source->m_dragContext->action == GDK_ACTION_COPY) action = wxDragCopy;
629 if (source->m_dragContext->action == GDK_ACTION_MOVE) action = wxDragMove;
630
631 source->GiveFeedback( action );
632
633 return 0;
634}
635
636//---------------------------------------------------------------------------
637// wxDropSource
638//---------------------------------------------------------------------------
639
640wxDropSource::wxDropSource( wxWindow *win, const wxIcon &icon )
641{
642 g_blockEventsOnDrag = TRUE;
643 m_waiting = TRUE;
644
645 m_iconWindow = (GtkWidget*) NULL;
646
647 m_window = win;
648 m_widget = win->m_widget;
649 if (win->m_wxwindow) m_widget = win->m_wxwindow;
650
651 m_retValue = wxDragCancel;
652
653 m_icon = icon;
654 if (wxNullIcon == icon) m_icon = wxIcon( page_xpm );
655}
656
657wxDropSource::wxDropSource( wxDataObject& data, wxWindow *win, const wxIcon &icon )
658{
659 m_waiting = TRUE;
660
661 SetData( data );
662
663 m_iconWindow = (GtkWidget*) NULL;
664
665 m_window = win;
666 m_widget = win->m_widget;
667 if (win->m_wxwindow) m_widget = win->m_wxwindow;
668
669 m_retValue = wxDragCancel;
670
671 m_icon = icon;
672 if (wxNullIcon == icon) m_icon = wxIcon( page_xpm );
673}
674
675wxDropSource::~wxDropSource()
676{
677 g_blockEventsOnDrag = FALSE;
678}
679
680void wxDropSource::PrepareIcon( int hot_x, int hot_y, GdkDragContext *context )
681{
682 GdkBitmap *mask = (GdkBitmap *) NULL;
683 if (m_icon.GetMask()) mask = m_icon.GetMask()->GetBitmap();
684 GdkPixmap *pixmap = m_icon.GetPixmap();
685
686 gint width,height;
687 gdk_window_get_size (pixmap, &width, &height);
688
689 GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
690 gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
691 gtk_widget_push_colormap (colormap);
692
693 m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
694 gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
695 gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
696
697 gtk_widget_pop_visual ();
698 gtk_widget_pop_colormap ();
699
700 gtk_widget_set_usize (m_iconWindow, width, height);
701 gtk_widget_realize (m_iconWindow);
702
703 gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
704 GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
705
706 gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
707
708 if (mask)
709 gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
710
711 gtk_drag_set_icon_widget( context, m_iconWindow, hot_x, hot_y );
712}
713
714wxDragResult wxDropSource::DoDragDrop( bool WXUNUSED(bAllowMove) )
715{
716 wxASSERT_MSG( m_data, wxT("wxDragSource: no data") );
717
718 if (!m_data)
719 return (wxDragResult) wxDragNone;
720
721 if (m_data->GetFormatCount() == 0)
722 return (wxDragResult) wxDragNone;
723
724 g_blockEventsOnDrag = TRUE;
725
726 RegisterWindow();
727
728 m_waiting = TRUE;
729
730 GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
731
732 wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
733 m_data->GetAllFormats( array );
734 for (size_t i = 0; i < m_data->GetFormatCount(); i++)
735 {
736 GdkAtom atom = array[i];
737 wxLogDebug( wxT("Supported atom %s"), gdk_atom_name( atom ) );
738 gtk_target_list_add( target_list, atom, 0, 0 );
739 }
740 delete[] array;
741
742 GdkEventMotion event;
743 event.window = m_widget->window;
744 int x = 0;
745 int y = 0;
746 GdkModifierType state;
747 gdk_window_get_pointer( event.window, &x, &y, &state );
748 event.x = x;
749 event.y = y;
750 event.state = state;
751 event.time = GDK_CURRENT_TIME;
752
753 /* GTK wants to know which button was pressed which caused the dragging */
754 int button_number = 0;
755 if (event.state & GDK_BUTTON1_MASK) button_number = 1;
756 else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
757 else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
758
759#if wxUSE_THREADS
760 /* disable GUI threads */
761 wxapp_uninstall_thread_wakeup();
762#endif
763
764 /* don't start dragging if no button is down */
765 if (button_number)
766 {
767 GdkDragContext *context = gtk_drag_begin( m_widget,
768 target_list,
769 (GdkDragAction)(GDK_ACTION_COPY|GDK_ACTION_MOVE),
770 button_number, /* number of mouse button which started drag */
771 (GdkEvent*) &event );
772
773 m_dragContext = context;
774
775 PrepareIcon( 0, 0, context );
776
777 while (m_waiting) gtk_main_iteration();;
778 }
779
780#if wxUSE_THREADS
781 /* re-enable GUI threads */
782 wxapp_install_thread_wakeup();
783#endif
784
785 g_blockEventsOnDrag = FALSE;
786
787 UnregisterWindow();
788
789 return m_retValue;
790}
791
792void wxDropSource::RegisterWindow()
793{
794 if (!m_widget) return;
795
796 gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
797 GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
798 gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
799 GTK_SIGNAL_FUNC (source_drag_data_delete), (gpointer) this );
800 gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
801 GTK_SIGNAL_FUNC (source_drag_begin), (gpointer) this );
802 gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
803 GTK_SIGNAL_FUNC (source_drag_end), (gpointer) this );
804
805}
806
807void wxDropSource::UnregisterWindow()
808{
809 if (!m_widget) return;
810
811 gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
812 GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
813 gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
814 GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
815 gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
816 GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
817 gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
818 GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
819}
820
821#endif
822
823 // wxUSE_DRAG_AND_DROP
wxWidgets (Impactor)