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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#include "wx/gtk/private/gtk2-compat.h"
30
31//----------------------------------------------------------------------------
32// global data
33//----------------------------------------------------------------------------
34
35extern bool g_blockEventsOnDrag;
36
37// the flags used for the last DoDragDrop()
38static long gs_flagsForDrag = 0;
39
40// the trace mask we use with wxLogTrace() - call
41// wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
42// (there are quite a few of them, so don't enable this by default)
43#define TRACE_DND "dnd"
44
45// global variables because GTK+ DnD want to have the
46// mouse event that caused it
47extern GdkEvent *g_lastMouseEvent;
48extern int g_lastButtonNumber;
49
50//----------------------------------------------------------------------------
51// standard icons
52//----------------------------------------------------------------------------
53
54/* Copyright (c) Julian Smart */
55static const char * page_xpm[] = {
56/* columns rows colors chars-per-pixel */
57"32 32 37 1",
58"5 c #7198D9",
59", c #769CDA",
60"2 c #DCE6F6",
61"i c #FFFFFF",
62"e c #779DDB",
63": c #9AB6E4",
64"9 c #EAF0FA",
65"- c #B1C7EB",
66"$ c #6992D7",
67"y c #F7F9FD",
68"= c #BED0EE",
69"q c #F0F5FC",
70"; c #A8C0E8",
71"@ c #366BC2",
72" c None",
73"u c #FDFEFF",
74"8 c #5987D3",
75"* c #C4D5F0",
76"7 c #7CA0DC",
77"O c #487BCE",
78"< c #6B94D7",
79"& c #CCDAF2",
80"> c #89A9DF",
81"3 c #5584D1",
82"w c #82A5DE",
83"1 c #3F74CB",
84"+ c #3A70CA",
85". c #3569BF",
86"% c #D2DFF4",
87"# c #3366BB",
88"r c #F5F8FD",
89"0 c #FAFCFE",
90"4 c #DFE8F7",
91"X c #5E8AD4",
92"o c #5282D0",
93"t c #B8CCEC",
94"6 c #E5EDF9",
95/* pixels */
96" ",
97" ",
98" ",
99" ",
100" ",
101" .XXXooOO++@# ",
102" $%&*=-;::>,<1 ",
103" $2%&*=-;::><:3 ",
104" $42%&*=-;::<&:3 ",
105" 56477<<<<8<<9&:X ",
106" 59642%&*=-;<09&:5 ",
107" 5q9642%&*=-<<<<<# ",
108" 5qqw777<<<<<88:>+ ",
109" erqq9642%&*=t;::+ ",
110" eyrqq9642%&*=t;:O ",
111" eyywwww777<<<<t;O ",
112" e0yyrqq9642%&*=to ",
113" e00yyrqq9642%&*=o ",
114" eu0wwwwwww777<&*X ",
115" euu00yyrqq9642%&X ",
116" eiuu00yyrqq9642%X ",
117" eiiwwwwwwwwww742$ ",
118" eiiiuu00yyrqq964$ ",
119" eiiiiuu00yyrqq96$ ",
120" eiiiiiuu00yyrqq95 ",
121" eiiiiiiuu00yyrqq5 ",
122" eeeeeeeeeeeeee55e ",
123" ",
124" ",
125" ",
126" ",
127" "
128};
129
130
131// ============================================================================
132// private functions
133// ============================================================================
134
135// ----------------------------------------------------------------------------
136// convert between GTK+ and wxWidgets DND constants
137// ----------------------------------------------------------------------------
138
139static wxDragResult ConvertFromGTK(long action)
140{
141 switch ( action )
142 {
143 case GDK_ACTION_COPY:
144 return wxDragCopy;
145
146 case GDK_ACTION_LINK:
147 return wxDragLink;
148
149 case GDK_ACTION_MOVE:
150 return wxDragMove;
151 }
152
153 return wxDragNone;
154}
155
156// ----------------------------------------------------------------------------
157// "drag_leave"
158// ----------------------------------------------------------------------------
159
160extern "C" {
161static void target_drag_leave( GtkWidget *WXUNUSED(widget),
162 GdkDragContext *context,
163 guint WXUNUSED(time),
164 wxDropTarget *drop_target )
165{
166 /* inform the wxDropTarget about the current GdkDragContext.
167 this is only valid for the duration of this call */
168 drop_target->GTKSetDragContext( 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->GTKSetDragContext( 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 /* Owen Taylor: "if the coordinates not in a drop zone,
195 return FALSE, otherwise call gtk_drag_status() and
196 return TRUE" */
197
198#if 0
199 wxPrintf( "motion\n" );
200 GList *tmp_list;
201 for (tmp_list = context->targets; tmp_list; tmp_list = tmp_list->next)
202 {
203 wxString atom = wxString::FromAscii( gdk_atom_name (GDK_POINTER_TO_ATOM (tmp_list->data)) );
204 wxPrintf( "Atom: %s\n", atom );
205 }
206#endif
207
208 // Inform the wxDropTarget about the current GdkDragContext.
209 // This is only valid for the duration of this call.
210 drop_target->GTKSetDragContext( context );
211
212 // Does the source actually accept the data type?
213 if (drop_target->GTKGetMatchingPair() == (GdkAtom) 0)
214 {
215 drop_target->GTKSetDragContext( NULL );
216 return FALSE;
217 }
218
219 wxDragResult suggested_action = drop_target->GTKFigureOutSuggestedAction();
220
221 wxDragResult result = wxDragNone;
222
223 if (drop_target->m_firstMotion)
224 {
225 // the first "drag_motion" event substitutes a "drag_enter" event
226 result = drop_target->OnEnter( x, y, suggested_action );
227 }
228 else
229 {
230 // give program a chance to react (i.e. to say no by returning FALSE)
231 result = drop_target->OnDragOver( x, y, suggested_action );
232 }
233
234 GdkDragAction result_action = GDK_ACTION_DEFAULT;
235 if (result == wxDragCopy)
236 result_action = GDK_ACTION_COPY;
237 else if (result == wxDragLink)
238 result_action = GDK_ACTION_LINK;
239 else
240 result_action = GDK_ACTION_MOVE;
241
242 // is result action actually supported
243 bool ret = (result_action != GDK_ACTION_DEFAULT) &&
244 (gdk_drag_context_get_actions(context) & result_action);
245
246 if (ret)
247 gdk_drag_status( context, result_action, time );
248
249 // after this, invalidate the drop_target's GdkDragContext
250 drop_target->GTKSetDragContext( NULL );
251
252 // this has to be done because GDK has no "drag_enter" event
253 drop_target->m_firstMotion = false;
254
255 return ret;
256}
257}
258
259// ----------------------------------------------------------------------------
260// "drag_drop"
261// ----------------------------------------------------------------------------
262
263extern "C" {
264static gboolean target_drag_drop( GtkWidget *widget,
265 GdkDragContext *context,
266 gint x,
267 gint y,
268 guint time,
269 wxDropTarget *drop_target )
270{
271 /* Owen Taylor: "if the drop is not in a drop zone,
272 return FALSE, otherwise, if you aren't accepting
273 the drop, call gtk_drag_finish() with success == FALSE
274 otherwise call gtk_drag_data_get()" */
275
276 /* inform the wxDropTarget about the current GdkDragContext.
277 this is only valid for the duration of this call */
278 drop_target->GTKSetDragContext( context );
279
280 // Does the source actually accept the data type?
281 if (drop_target->GTKGetMatchingPair() == (GdkAtom) 0)
282 {
283 // cancel the whole thing
284 gtk_drag_finish( context,
285 FALSE, // no success
286 FALSE, // don't delete data on dropping side
287 time );
288
289 drop_target->GTKSetDragContext( NULL );
290
291 drop_target->m_firstMotion = true;
292
293 return FALSE;
294 }
295
296 /* inform the wxDropTarget about the current drag widget.
297 this is only valid for the duration of this call */
298 drop_target->GTKSetDragWidget( widget );
299
300 /* inform the wxDropTarget about the current drag time.
301 this is only valid for the duration of this call */
302 drop_target->GTKSetDragTime( time );
303
304 /* reset the block here as someone might very well
305 show a dialog as a reaction to a drop and this
306 wouldn't work without events */
307 g_blockEventsOnDrag = false;
308
309 bool ret = drop_target->OnDrop( x, y );
310
311 if (!ret)
312 {
313 wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
314
315 /* cancel the whole thing */
316 gtk_drag_finish( context,
317 FALSE, /* no success */
318 FALSE, /* don't delete data on dropping side */
319 time );
320 }
321 else
322 {
323 wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned true") );
324
325 GdkAtom format = drop_target->GTKGetMatchingPair();
326
327 // this does happen somehow, see bug 555111
328 wxCHECK_MSG( format, FALSE, wxT("no matching GdkAtom for format?") );
329
330 /* this should trigger an "drag_data_received" event */
331 gtk_drag_get_data( widget,
332 context,
333 format,
334 time );
335 }
336
337 /* after this, invalidate the drop_target's GdkDragContext */
338 drop_target->GTKSetDragContext( NULL );
339
340 /* after this, invalidate the drop_target's drag widget */
341 drop_target->GTKSetDragWidget( NULL );
342
343 /* this has to be done because GDK has no "drag_enter" event */
344 drop_target->m_firstMotion = true;
345
346 return ret;
347}
348}
349
350// ----------------------------------------------------------------------------
351// "drag_data_received"
352// ----------------------------------------------------------------------------
353
354extern "C" {
355static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
356 GdkDragContext *context,
357 gint x,
358 gint y,
359 GtkSelectionData *data,
360 guint WXUNUSED(info),
361 guint time,
362 wxDropTarget *drop_target )
363{
364 /* Owen Taylor: "call gtk_drag_finish() with
365 success == TRUE" */
366
367 if (gtk_selection_data_get_length(data) <= 0 || gtk_selection_data_get_format(data) != 8)
368 {
369 /* negative data length and non 8-bit data format
370 qualifies for junk */
371 gtk_drag_finish (context, FALSE, FALSE, time);
372
373 return;
374 }
375
376 wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
377
378 /* inform the wxDropTarget about the current GtkSelectionData.
379 this is only valid for the duration of this call */
380 drop_target->GTKSetDragData( data );
381
382 wxDragResult result = ConvertFromGTK(gdk_drag_context_get_selected_action(context));
383
384 if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
385 {
386 wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned true") );
387
388 /* tell GTK that data transfer was successful */
389 gtk_drag_finish( context, TRUE, FALSE, time );
390 }
391 else
392 {
393 wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
394
395 /* tell GTK that data transfer was not successful */
396 gtk_drag_finish( context, FALSE, FALSE, time );
397 }
398
399 /* after this, invalidate the drop_target's drag data */
400 drop_target->GTKSetDragData( NULL );
401}
402}
403
404//----------------------------------------------------------------------------
405// wxDropTarget
406//----------------------------------------------------------------------------
407
408wxDropTarget::wxDropTarget( wxDataObject *data )
409 : wxDropTargetBase( data )
410{
411 m_firstMotion = true;
412 m_dragContext = NULL;
413 m_dragWidget = NULL;
414 m_dragData = NULL;
415 m_dragTime = 0;
416}
417
418wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
419 wxCoord WXUNUSED(y),
420 wxDragResult def )
421{
422 return def;
423}
424
425bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
426{
427 return true;
428}
429
430wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
431 wxDragResult def )
432{
433 return GetData() ? def : wxDragNone;
434}
435
436wxDragResult wxDropTarget::GTKFigureOutSuggestedAction()
437{
438 if (!m_dragContext)
439 return wxDragError;
440
441 // GTK+ always supposes that we want to copy the data by default while we
442 // might want to move it, so examine not only suggested_action - which is
443 // only good if we don't have our own preferences - but also the actions
444 // field
445 wxDragResult suggested_action = wxDragNone;
446 const GdkDragAction actions = gdk_drag_context_get_actions(m_dragContext);
447 if (GetDefaultAction() == wxDragNone)
448 {
449 // use default action set by wxDropSource::DoDragDrop()
450 if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
451 (actions & GDK_ACTION_MOVE))
452 {
453 // move is requested by the program and allowed by GTK+ - do it, even
454 // though suggested_action may be currently wxDragCopy
455 suggested_action = wxDragMove;
456 }
457 else // use whatever GTK+ says we should
458 {
459 suggested_action = ConvertFromGTK(gdk_drag_context_get_suggested_action(m_dragContext));
460
461#if 0
462 // RR: I don't understand the code below: if the drag comes from
463 // a different app, the gs_flagsForDrag is invalid; if it
464 // comes from the same wx app, then GTK+ hopefully won't
465 // suggest something we didn't allow in the frist place
466 // in DoDrop()
467 if ( (suggested_action == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
468 {
469 // we're requested to move but we can't
470 suggested_action = wxDragCopy;
471 }
472#endif
473 }
474 }
475 else if (GetDefaultAction() == wxDragMove &&
476 (actions & GDK_ACTION_MOVE))
477 {
478
479 suggested_action = wxDragMove;
480 }
481 else
482 {
483 if (actions & GDK_ACTION_COPY)
484 suggested_action = wxDragCopy;
485 else if (actions & GDK_ACTION_MOVE)
486 suggested_action = wxDragMove;
487 else if (actions & GDK_ACTION_LINK)
488 suggested_action = wxDragLink;
489 else
490 suggested_action = wxDragNone;
491 }
492
493 return suggested_action;
494}
495
496wxDataFormat wxDropTarget::GetMatchingPair()
497{
498 return wxDataFormat( GTKGetMatchingPair() );
499}
500
501GdkAtom wxDropTarget::GTKGetMatchingPair(bool quiet)
502{
503 if (!m_dataObject)
504 return (GdkAtom) 0;
505
506 if (!m_dragContext)
507 return (GdkAtom) 0;
508
509 const GList* child = gdk_drag_context_list_targets(m_dragContext);
510 while (child)
511 {
512 GdkAtom formatAtom = (GdkAtom)(child->data);
513 wxDataFormat format( formatAtom );
514
515 if ( !quiet )
516 {
517 wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
518 format.GetId().c_str());
519 }
520
521 if (m_dataObject->IsSupportedFormat( format ))
522 return formatAtom;
523
524 child = child->next;
525 }
526
527 return (GdkAtom) 0;
528}
529
530bool wxDropTarget::GetData()
531{
532 if (!m_dragData)
533 return false;
534
535 if (!m_dataObject)
536 return false;
537
538 wxDataFormat dragFormat(gtk_selection_data_get_target(m_dragData));
539
540 if (!m_dataObject->IsSupportedFormat( dragFormat ))
541 return false;
542
543 m_dataObject->SetData(dragFormat,
544 (size_t)gtk_selection_data_get_length(m_dragData),
545 (const void*)gtk_selection_data_get_data(m_dragData));
546
547 return true;
548}
549
550void wxDropTarget::GtkUnregisterWidget( GtkWidget *widget )
551{
552 wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
553
554 gtk_drag_dest_unset( widget );
555
556 g_signal_handlers_disconnect_by_func (widget,
557 (gpointer) target_drag_leave, this);
558 g_signal_handlers_disconnect_by_func (widget,
559 (gpointer) target_drag_motion, this);
560 g_signal_handlers_disconnect_by_func (widget,
561 (gpointer) target_drag_drop, this);
562 g_signal_handlers_disconnect_by_func (widget,
563 (gpointer) target_drag_data_received, this);
564}
565
566void wxDropTarget::GtkRegisterWidget( GtkWidget *widget )
567{
568 wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
569
570 /* gtk_drag_dest_set() determines what default behaviour we'd like
571 GTK to supply. we don't want to specify out targets (=formats)
572 or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
573 not GTK_DEST_DEFAULT_DROP). instead we react individually to
574 "drag_motion" and "drag_drop" events. this makes it possible
575 to allow dropping on only a small area. we should set
576 GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
577 highlighting if dragging over standard controls, but this
578 seems to be broken without the other two. */
579
580 gtk_drag_dest_set( widget,
581 (GtkDestDefaults) 0, /* no default behaviour */
582 NULL, /* we don't supply any formats here */
583 0, /* number of targets = 0 */
584 (GdkDragAction) 0 ); /* we don't supply any actions here */
585
586 g_signal_connect (widget, "drag_leave",
587 G_CALLBACK (target_drag_leave), this);
588
589 g_signal_connect (widget, "drag_motion",
590 G_CALLBACK (target_drag_motion), this);
591
592 g_signal_connect (widget, "drag_drop",
593 G_CALLBACK (target_drag_drop), this);
594
595 g_signal_connect (widget, "drag_data_received",
596 G_CALLBACK (target_drag_data_received), this);
597}
598
599//----------------------------------------------------------------------------
600// "drag_data_get"
601//----------------------------------------------------------------------------
602
603extern "C" {
604static void
605source_drag_data_get (GtkWidget *WXUNUSED(widget),
606 GdkDragContext *context,
607 GtkSelectionData *selection_data,
608 guint WXUNUSED(info),
609 guint WXUNUSED(time),
610 wxDropSource *drop_source )
611{
612 wxDataFormat format(gtk_selection_data_get_target(selection_data));
613
614 wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
615 format.GetId().c_str());
616
617 drop_source->m_retValue = wxDragError;
618
619 wxDataObject *data = drop_source->GetDataObject();
620
621 if (!data)
622 {
623 wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
624 return;
625 }
626
627 if (!data->IsSupportedFormat(format))
628 {
629 wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
630 return;
631 }
632
633 if (data->GetDataSize(format) == 0)
634 {
635 wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
636 return;
637 }
638
639 size_t size = data->GetDataSize(format);
640
641// printf( "data size: %d.\n", (int)data_size );
642
643 guchar *d = new guchar[size];
644
645 if (!data->GetDataHere( format, (void*)d ))
646 {
647 delete[] d;
648 return;
649 }
650
651 drop_source->m_retValue = ConvertFromGTK(gdk_drag_context_get_selected_action(context));
652
653 gtk_selection_data_set( selection_data,
654 gtk_selection_data_get_target(selection_data),
655 8, // 8-bit
656 d,
657 size );
658
659 delete[] d;
660}
661}
662
663//----------------------------------------------------------------------------
664// "drag_end"
665//----------------------------------------------------------------------------
666
667extern "C" {
668static void source_drag_end( GtkWidget *WXUNUSED(widget),
669 GdkDragContext *WXUNUSED(context),
670 wxDropSource *drop_source )
671{
672 drop_source->m_waiting = false;
673}
674}
675
676//-----------------------------------------------------------------------------
677// "configure_event" from m_iconWindow
678//-----------------------------------------------------------------------------
679
680extern "C" {
681static gint
682gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
683{
684 source->GiveFeedback(ConvertFromGTK(gdk_drag_context_get_selected_action(source->m_dragContext)));
685
686 return 0;
687}
688}
689
690//---------------------------------------------------------------------------
691// wxDropSource
692//---------------------------------------------------------------------------
693
694wxDropSource::wxDropSource(wxWindow *win,
695 const wxIcon &iconCopy,
696 const wxIcon &iconMove,
697 const wxIcon &iconNone)
698{
699 m_waiting = true;
700
701 m_iconWindow = NULL;
702
703 m_window = win;
704 m_widget = win->m_widget;
705 if (win->m_wxwindow) m_widget = win->m_wxwindow;
706
707 m_retValue = wxDragNone;
708
709 SetIcons(iconCopy, iconMove, iconNone);
710}
711
712wxDropSource::wxDropSource(wxDataObject& data,
713 wxWindow *win,
714 const wxIcon &iconCopy,
715 const wxIcon &iconMove,
716 const wxIcon &iconNone)
717{
718 m_waiting = true;
719
720 SetData( data );
721
722 m_iconWindow = NULL;
723
724 m_window = win;
725 m_widget = win->m_widget;
726 if (win->m_wxwindow) m_widget = win->m_wxwindow;
727
728 m_retValue = wxDragNone;
729
730 SetIcons(iconCopy, iconMove, iconNone);
731}
732
733void wxDropSource::SetIcons(const wxIcon &iconCopy,
734 const wxIcon &iconMove,
735 const wxIcon &iconNone)
736{
737 m_iconCopy = iconCopy;
738 m_iconMove = iconMove;
739 m_iconNone = iconNone;
740
741 if ( !m_iconCopy.IsOk() )
742 m_iconCopy = wxIcon(page_xpm);
743 if ( !m_iconMove.IsOk() )
744 m_iconMove = m_iconCopy;
745 if ( !m_iconNone.IsOk() )
746 m_iconNone = m_iconCopy;
747}
748
749wxDropSource::~wxDropSource()
750{
751}
752
753void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
754{
755 // get the right icon to display
756 wxIcon *icon = NULL;
757 if ( action & GDK_ACTION_MOVE )
758 icon = &m_iconMove;
759 else if ( action & GDK_ACTION_COPY )
760 icon = &m_iconCopy;
761 else
762 icon = &m_iconNone;
763
764#ifndef __WXGTK3__
765 GdkBitmap *mask;
766 if ( icon->GetMask() )
767 mask = *icon->GetMask();
768 else
769 mask = NULL;
770
771 GdkPixmap *pixmap = icon->GetPixmap();
772
773 GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
774 gtk_widget_push_colormap (colormap);
775#endif
776
777 m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
778 gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
779 gtk_widget_set_app_paintable (m_iconWindow, TRUE);
780
781#ifdef __WXGTK3__
782 gtk_widget_set_visual(m_iconWindow, gtk_widget_get_visual(m_widget));
783#else
784 gtk_widget_pop_colormap ();
785#endif
786
787 gtk_widget_set_size_request (m_iconWindow, icon->GetWidth(), icon->GetHeight());
788 gtk_widget_realize (m_iconWindow);
789
790 g_signal_connect (m_iconWindow, "configure_event",
791 G_CALLBACK (gtk_dnd_window_configure_callback), this);
792
793#ifdef __WXGTK3__
794 cairo_t* cr = gdk_cairo_create(gtk_widget_get_window(m_iconWindow));
795 icon->SetSourceSurface(cr, 0, 0);
796 cairo_pattern_t* pattern = cairo_get_source(cr);
797 gdk_window_set_background_pattern(gtk_widget_get_window(m_iconWindow), pattern);
798 cairo_destroy(cr);
799 cairo_surface_t* mask = NULL;
800 if (icon->GetMask())
801 mask = *icon->GetMask();
802 if (mask)
803 {
804 cairo_region_t* region = gdk_cairo_region_create_from_surface(mask);
805 gtk_widget_shape_combine_region(m_iconWindow, region);
806 cairo_region_destroy(region);
807 }
808#else
809 gdk_window_set_back_pixmap(gtk_widget_get_window(m_iconWindow), pixmap, false);
810
811 if (mask)
812 gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
813#endif
814
815 gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
816}
817
818wxDragResult wxDropSource::DoDragDrop(int flags)
819{
820 wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
821 wxT("Drop source: no data") );
822
823 // still in drag
824 if (g_blockEventsOnDrag)
825 return wxDragNone;
826
827 // don't start dragging if no button is down
828 if (g_lastButtonNumber == 0)
829 return wxDragNone;
830
831 // we can only start a drag after a mouse event
832 if (g_lastMouseEvent == NULL)
833 return wxDragNone;
834
835 GTKConnectDragSignals();
836 wxON_BLOCK_EXIT_OBJ0(*this, wxDropSource::GTKDisconnectDragSignals);
837
838 m_waiting = true;
839
840 GtkTargetList *target_list = gtk_target_list_new( NULL, 0 );
841
842 wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
843 m_data->GetAllFormats( array );
844 size_t count = m_data->GetFormatCount();
845 for (size_t i = 0; i < count; i++)
846 {
847 GdkAtom atom = array[i];
848 wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"),
849 gdk_atom_name( atom ));
850 gtk_target_list_add( target_list, atom, 0, 0 );
851 }
852 delete[] array;
853
854 int allowed_actions = GDK_ACTION_COPY;
855 if ( flags & wxDrag_AllowMove )
856 allowed_actions |= GDK_ACTION_MOVE;
857
858 // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
859 // to use a global to pass the flags to the drop target but I'd
860 // surely prefer a better way to do it
861 gs_flagsForDrag = flags;
862
863 m_retValue = wxDragCancel;
864
865 GdkDragContext *context = gtk_drag_begin( m_widget,
866 target_list,
867 (GdkDragAction)allowed_actions,
868 g_lastButtonNumber, // number of mouse button which started drag
869 (GdkEvent*) g_lastMouseEvent );
870
871 if ( !context )
872 {
873 // this can happen e.g. if gdk_pointer_grab() failed
874 return wxDragError;
875 }
876
877 m_dragContext = context;
878
879 PrepareIcon( allowed_actions, context );
880
881 while (m_waiting)
882 gtk_main_iteration();
883
884 g_signal_handlers_disconnect_by_func (m_iconWindow,
885 (gpointer) gtk_dnd_window_configure_callback, this);
886
887 return m_retValue;
888}
889
890void wxDropSource::GTKConnectDragSignals()
891{
892 if (!m_widget)
893 return;
894
895 g_blockEventsOnDrag = true;
896
897 g_signal_connect (m_widget, "drag_data_get",
898 G_CALLBACK (source_drag_data_get), this);
899 g_signal_connect (m_widget, "drag_end",
900 G_CALLBACK (source_drag_end), this);
901
902}
903
904void wxDropSource::GTKDisconnectDragSignals()
905{
906 if (!m_widget)
907 return;
908
909 g_blockEventsOnDrag = false;
910
911 g_signal_handlers_disconnect_by_func (m_widget,
912 (gpointer) source_drag_data_get,
913 this);
914 g_signal_handlers_disconnect_by_func (m_widget,
915 (gpointer) source_drag_end,
916 this);
917}
918
919#endif
920 // wxUSE_DRAG_AND_DROP
wxWidgets (Impactor)