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Improved selection mode handling in wxGrid::SelectBlock
[wxWidgets.git] / src / gtk1 / 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 FALSE") );
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( wxT("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 m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
430
431 return TRUE;
432}
433
434void wxDropTarget::UnregisterWidget( GtkWidget *widget )
435{
436 wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
437
438 gtk_drag_dest_unset( widget );
439
440 gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
441 GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
442
443 gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
444 GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
445
446 gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
447 GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
448
449 gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
450 GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
451}
452
453void wxDropTarget::RegisterWidget( GtkWidget *widget )
454{
455 wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
456
457 /* gtk_drag_dest_set() determines what default behaviour we'd like
458 GTK to supply. we don't want to specify out targets (=formats)
459 or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
460 not GTK_DEST_DEFAULT_DROP). instead we react individually to
461 "drag_motion" and "drag_drop" events. this makes it possible
462 to allow dropping on only a small area. we should set
463 GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
464 highlighting if dragging over standard controls, but this
465 seems to be broken without the other two. */
466
467 gtk_drag_dest_set( widget,
468 (GtkDestDefaults) 0, /* no default behaviour */
469 (GtkTargetEntry*) NULL, /* we don't supply any formats here */
470 0, /* number of targets = 0 */
471 (GdkDragAction) 0 ); /* we don't supply any actions here */
472
473 gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
474 GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
475
476 gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
477 GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
478
479 gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
480 GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
481
482 gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
483 GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
484}
485
486//----------------------------------------------------------------------------
487// "drag_data_get"
488//----------------------------------------------------------------------------
489
490static void
491source_drag_data_get (GtkWidget *WXUNUSED(widget),
492 GdkDragContext *WXUNUSED(context),
493 GtkSelectionData *selection_data,
494 guint WXUNUSED(info),
495 guint WXUNUSED(time),
496 wxDropSource *drop_source )
497{
498 if (g_isIdle) wxapp_install_idle_handler();
499
500 wxDataFormat format( selection_data->target );
501
502 wxLogDebug( wxT("Drop source: format requested: %s"), format.GetId().c_str() );
503
504 drop_source->m_retValue = wxDragCancel;
505
506 wxDataObject *data = drop_source->GetDataObject();
507
508 if (!data)
509 {
510 wxLogDebug( wxT("Drop source: no data object") );
511 return;
512 }
513
514 if (!data->IsSupportedFormat(format))
515 {
516 wxLogDebug( wxT("Drop source: unsupported format") );
517 return;
518 }
519
520 if (data->GetDataSize(format) == 0)
521 {
522 wxLogDebug( wxT("Drop source: empty data") );
523 return;
524 }
525
526 size_t size = data->GetDataSize(format);
527
528// printf( "data size: %d.\n", (int)data_size );
529
530 guchar *d = new guchar[size];
531
532 if (!data->GetDataHere( format, (void*)d ))
533 {
534 delete[] d;
535 return;
536 }
537
538#if wxUSE_THREADS
539 /* disable GUI threads */
540 wxapp_uninstall_thread_wakeup();
541#endif
542
543 gtk_selection_data_set( selection_data,
544 selection_data->target,
545 8, // 8-bit
546 d,
547 size );
548
549#if wxUSE_THREADS
550 /* enable GUI threads */
551 wxapp_install_thread_wakeup();
552#endif
553
554 delete[] d;
555}
556
557//----------------------------------------------------------------------------
558// "drag_data_delete"
559//----------------------------------------------------------------------------
560
561static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
562 GdkDragContext *WXUNUSED(context),
563 wxDropSource *WXUNUSED(drop_source) )
564{
565 if (g_isIdle)
566 wxapp_install_idle_handler();
567
568 // printf( "Drag source: drag_data_delete\n" );
569}
570
571//----------------------------------------------------------------------------
572// "drag_begin"
573//----------------------------------------------------------------------------
574
575static void source_drag_begin( GtkWidget *WXUNUSED(widget),
576 GdkDragContext *WXUNUSED(context),
577 wxDropSource *WXUNUSED(drop_source) )
578{
579 if (g_isIdle)
580 wxapp_install_idle_handler();
581
582 // printf( "Drag source: drag_begin.\n" );
583}
584
585//----------------------------------------------------------------------------
586// "drag_end"
587//----------------------------------------------------------------------------
588
589static void source_drag_end( GtkWidget *WXUNUSED(widget),
590 GdkDragContext *WXUNUSED(context),
591 wxDropSource *drop_source )
592{
593 if (g_isIdle) wxapp_install_idle_handler();
594
595 // printf( "Drag source: drag_end.\n" );
596
597 drop_source->m_waiting = FALSE;
598}
599
600//-----------------------------------------------------------------------------
601// "configure_event" from m_iconWindow
602//-----------------------------------------------------------------------------
603
604static gint
605gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
606{
607 if (g_isIdle)
608 wxapp_install_idle_handler();
609
610 wxDragResult action = wxDragNone;
611 if (source->m_dragContext->action == GDK_ACTION_COPY) action = wxDragCopy;
612 if (source->m_dragContext->action == GDK_ACTION_MOVE) action = wxDragMove;
613
614 source->GiveFeedback( action );
615
616 return 0;
617}
618
619//---------------------------------------------------------------------------
620// wxDropSource
621//---------------------------------------------------------------------------
622
623wxDropSource::wxDropSource( wxWindow *win, const wxIcon &icon )
624{
625 m_waiting = TRUE;
626
627 m_iconWindow = (GtkWidget*) NULL;
628
629 m_window = win;
630 m_widget = win->m_widget;
631 if (win->m_wxwindow) m_widget = win->m_wxwindow;
632
633 m_retValue = wxDragCancel;
634
635 m_icon = icon;
636 if (wxNullIcon == icon) m_icon = wxIcon( page_xpm );
637}
638
639wxDropSource::wxDropSource( wxDataObject& data, wxWindow *win, const wxIcon &icon )
640{
641 m_waiting = TRUE;
642
643 SetData( data );
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()
658{
659}
660
661void wxDropSource::PrepareIcon( int hot_x, int hot_y, GdkDragContext *context )
662{
663 GdkBitmap *mask = (GdkBitmap *) NULL;
664 if (m_icon.GetMask()) mask = m_icon.GetMask()->GetBitmap();
665 GdkPixmap *pixmap = m_icon.GetPixmap();
666
667 gint width,height;
668 gdk_window_get_size (pixmap, &width, &height);
669
670 GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
671 gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
672 gtk_widget_push_colormap (colormap);
673
674 m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
675 gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
676 gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
677
678 gtk_widget_pop_visual ();
679 gtk_widget_pop_colormap ();
680
681 gtk_widget_set_usize (m_iconWindow, width, height);
682 gtk_widget_realize (m_iconWindow);
683
684 gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
685 GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
686
687 gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
688
689 if (mask)
690 gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
691
692 gtk_drag_set_icon_widget( context, m_iconWindow, hot_x, hot_y );
693}
694
695wxDragResult wxDropSource::DoDragDrop( bool allowMove )
696{
697 wxASSERT_MSG( m_data, wxT("Drop source: no data") );
698
699 if (!m_data)
700 return (wxDragResult) wxDragNone;
701
702 if (m_data->GetFormatCount() == 0)
703 return (wxDragResult) wxDragNone;
704
705 g_blockEventsOnDrag = TRUE;
706
707 RegisterWindow();
708
709 m_waiting = TRUE;
710
711 GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
712
713 wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
714 m_data->GetAllFormats( array );
715 for (size_t i = 0; i < m_data->GetFormatCount(); i++)
716 {
717 GdkAtom atom = array[i];
718 wxLogDebug( wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ) );
719 gtk_target_list_add( target_list, atom, 0, 0 );
720 }
721 delete[] array;
722
723 GdkEventMotion event;
724 event.window = m_widget->window;
725 int x = 0;
726 int y = 0;
727 GdkModifierType state;
728 gdk_window_get_pointer( event.window, &x, &y, &state );
729 event.x = x;
730 event.y = y;
731 event.state = state;
732 event.time = (guint32)GDK_CURRENT_TIME;
733
734 /* GTK wants to know which button was pressed which caused the dragging */
735 int button_number = 0;
736 if (event.state & GDK_BUTTON1_MASK) button_number = 1;
737 else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
738 else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
739
740#if wxUSE_THREADS
741 /* disable GUI threads */
742 wxapp_uninstall_thread_wakeup();
743#endif
744
745 /* don't start dragging if no button is down */
746 if (button_number)
747 {
748 GdkDragAction action = GDK_ACTION_COPY;
749 if (allowMove) action = (GdkDragAction)(GDK_ACTION_MOVE|GDK_ACTION_COPY);
750 GdkDragContext *context = gtk_drag_begin( m_widget,
751 target_list,
752 action,
753 button_number, /* number of mouse button which started drag */
754 (GdkEvent*) &event );
755
756 m_dragContext = context;
757
758 PrepareIcon( 0, 0, context );
759
760 while (m_waiting) gtk_main_iteration();
761
762 if (context->action == GDK_ACTION_COPY)
763 m_retValue = wxDragCopy;
764 if (context->action == GDK_ACTION_MOVE)
765 m_retValue = wxDragMove;
766 }
767
768#if wxUSE_THREADS
769 /* re-enable GUI threads */
770 wxapp_install_thread_wakeup();
771#endif
772
773 g_blockEventsOnDrag = FALSE;
774
775 UnregisterWindow();
776
777 return m_retValue;
778}
779
780void wxDropSource::RegisterWindow()
781{
782 if (!m_widget) return;
783
784 gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
785 GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
786 gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
787 GTK_SIGNAL_FUNC (source_drag_data_delete), (gpointer) this );
788 gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
789 GTK_SIGNAL_FUNC (source_drag_begin), (gpointer) this );
790 gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
791 GTK_SIGNAL_FUNC (source_drag_end), (gpointer) this );
792
793}
794
795void wxDropSource::UnregisterWindow()
796{
797 if (!m_widget) return;
798
799 gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
800 GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
801 gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
802 GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
803 gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
804 GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
805 gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
806 GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
807}
808
809#endif
810 // wxUSE_DRAG_AND_DROP
wxWidgets (Impactor)