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Suppress various harmless warnings in MinGW build with -Wconversion.
[wxWidgets.git] / src / gtk / dnd.cpp
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1///////////////////////////////////////////////////////////////////////////////
2// Name: src/gtk/dnd.cpp
3// Purpose: wxDropTarget class
4// Author: Robert Roebling
5// Id: $Id$
6// Copyright: (c) 1998 Robert Roebling
7// Licence: wxWindows licence
8///////////////////////////////////////////////////////////////////////////////
9
10// For compilers that support precompilation, includes "wx.h".
11#include "wx/wxprec.h"
12
13#if wxUSE_DRAG_AND_DROP
14
15#include "wx/dnd.h"
16
17#ifndef WX_PRECOMP
18 #include "wx/intl.h"
19 #include "wx/log.h"
20 #include "wx/app.h"
21 #include "wx/utils.h"
22 #include "wx/window.h"
23 #include "wx/gdicmn.h"
24#endif
25
26#include "wx/scopeguard.h"
27
28#include <gtk/gtk.h>
29#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 (context->actions & 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(context->action);
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 if (GetDefaultAction() == wxDragNone)
447 {
448 // use default action set by wxDropSource::DoDragDrop()
449 if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
450 (m_dragContext->actions & GDK_ACTION_MOVE ) )
451 {
452 // move is requested by the program and allowed by GTK+ - do it, even
453 // though suggested_action may be currently wxDragCopy
454 suggested_action = wxDragMove;
455 }
456 else // use whatever GTK+ says we should
457 {
458 suggested_action = ConvertFromGTK(m_dragContext->suggested_action);
459
460#if 0
461 // RR: I don't understand the code below: if the drag comes from
462 // a different app, the gs_flagsForDrag is invalid; if it
463 // comes from the same wx app, then GTK+ hopefully won't
464 // suggest something we didn't allow in the frist place
465 // in DoDrop()
466 if ( (suggested_action == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
467 {
468 // we're requested to move but we can't
469 suggested_action = wxDragCopy;
470 }
471#endif
472 }
473 }
474 else if (GetDefaultAction() == wxDragMove &&
475 (m_dragContext->actions & GDK_ACTION_MOVE))
476 {
477
478 suggested_action = wxDragMove;
479 }
480 else
481 {
482 if (m_dragContext->actions & GDK_ACTION_COPY)
483 suggested_action = wxDragCopy;
484 else if (m_dragContext->actions & GDK_ACTION_MOVE)
485 suggested_action = wxDragMove;
486 else if (m_dragContext->actions & GDK_ACTION_LINK)
487 suggested_action = wxDragLink;
488 else
489 suggested_action = wxDragNone;
490 }
491
492 return suggested_action;
493}
494
495wxDataFormat wxDropTarget::GetMatchingPair()
496{
497 return wxDataFormat( GTKGetMatchingPair() );
498}
499
500GdkAtom wxDropTarget::GTKGetMatchingPair(bool quiet)
501{
502 if (!m_dataObject)
503 return (GdkAtom) 0;
504
505 if (!m_dragContext)
506 return (GdkAtom) 0;
507
508 GList *child = m_dragContext->targets;
509 while (child)
510 {
511 GdkAtom formatAtom = (GdkAtom)(child->data);
512 wxDataFormat format( formatAtom );
513
514 if ( !quiet )
515 {
516 wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
517 format.GetId().c_str());
518 }
519
520 if (m_dataObject->IsSupportedFormat( format ))
521 return formatAtom;
522
523 child = child->next;
524 }
525
526 return (GdkAtom) 0;
527}
528
529bool wxDropTarget::GetData()
530{
531 if (!m_dragData)
532 return false;
533
534 if (!m_dataObject)
535 return false;
536
537 wxDataFormat dragFormat(gtk_selection_data_get_target(m_dragData));
538
539 if (!m_dataObject->IsSupportedFormat( dragFormat ))
540 return false;
541
542 m_dataObject->SetData(dragFormat,
543 (size_t)gtk_selection_data_get_length(m_dragData),
544 (const void*)gtk_selection_data_get_data(m_dragData));
545
546 return true;
547}
548
549void wxDropTarget::GtkUnregisterWidget( GtkWidget *widget )
550{
551 wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
552
553 gtk_drag_dest_unset( widget );
554
555 g_signal_handlers_disconnect_by_func (widget,
556 (gpointer) target_drag_leave, this);
557 g_signal_handlers_disconnect_by_func (widget,
558 (gpointer) target_drag_motion, this);
559 g_signal_handlers_disconnect_by_func (widget,
560 (gpointer) target_drag_drop, this);
561 g_signal_handlers_disconnect_by_func (widget,
562 (gpointer) target_drag_data_received, this);
563}
564
565void wxDropTarget::GtkRegisterWidget( GtkWidget *widget )
566{
567 wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
568
569 /* gtk_drag_dest_set() determines what default behaviour we'd like
570 GTK to supply. we don't want to specify out targets (=formats)
571 or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
572 not GTK_DEST_DEFAULT_DROP). instead we react individually to
573 "drag_motion" and "drag_drop" events. this makes it possible
574 to allow dropping on only a small area. we should set
575 GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
576 highlighting if dragging over standard controls, but this
577 seems to be broken without the other two. */
578
579 gtk_drag_dest_set( widget,
580 (GtkDestDefaults) 0, /* no default behaviour */
581 NULL, /* we don't supply any formats here */
582 0, /* number of targets = 0 */
583 (GdkDragAction) 0 ); /* we don't supply any actions here */
584
585 g_signal_connect (widget, "drag_leave",
586 G_CALLBACK (target_drag_leave), this);
587
588 g_signal_connect (widget, "drag_motion",
589 G_CALLBACK (target_drag_motion), this);
590
591 g_signal_connect (widget, "drag_drop",
592 G_CALLBACK (target_drag_drop), this);
593
594 g_signal_connect (widget, "drag_data_received",
595 G_CALLBACK (target_drag_data_received), this);
596}
597
598//----------------------------------------------------------------------------
599// "drag_data_get"
600//----------------------------------------------------------------------------
601
602extern "C" {
603static void
604source_drag_data_get (GtkWidget *WXUNUSED(widget),
605 GdkDragContext *context,
606 GtkSelectionData *selection_data,
607 guint WXUNUSED(info),
608 guint WXUNUSED(time),
609 wxDropSource *drop_source )
610{
611 wxDataFormat format(gtk_selection_data_get_target(selection_data));
612
613 wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
614 format.GetId().c_str());
615
616 drop_source->m_retValue = wxDragError;
617
618 wxDataObject *data = drop_source->GetDataObject();
619
620 if (!data)
621 {
622 wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
623 return;
624 }
625
626 if (!data->IsSupportedFormat(format))
627 {
628 wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
629 return;
630 }
631
632 if (data->GetDataSize(format) == 0)
633 {
634 wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
635 return;
636 }
637
638 size_t size = data->GetDataSize(format);
639
640// printf( "data size: %d.\n", (int)data_size );
641
642 guchar *d = new guchar[size];
643
644 if (!data->GetDataHere( format, (void*)d ))
645 {
646 delete[] d;
647 return;
648 }
649
650 drop_source->m_retValue = ConvertFromGTK( context->action );
651
652 gtk_selection_data_set( selection_data,
653 gtk_selection_data_get_target(selection_data),
654 8, // 8-bit
655 d,
656 size );
657
658 delete[] d;
659}
660}
661
662//----------------------------------------------------------------------------
663// "drag_end"
664//----------------------------------------------------------------------------
665
666extern "C" {
667static void source_drag_end( GtkWidget *WXUNUSED(widget),
668 GdkDragContext *WXUNUSED(context),
669 wxDropSource *drop_source )
670{
671 drop_source->m_waiting = false;
672}
673}
674
675//-----------------------------------------------------------------------------
676// "configure_event" from m_iconWindow
677//-----------------------------------------------------------------------------
678
679extern "C" {
680static gint
681gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
682{
683 source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
684
685 return 0;
686}
687}
688
689//---------------------------------------------------------------------------
690// wxDropSource
691//---------------------------------------------------------------------------
692
693wxDropSource::wxDropSource(wxWindow *win,
694 const wxIcon &iconCopy,
695 const wxIcon &iconMove,
696 const wxIcon &iconNone)
697{
698 m_waiting = true;
699
700 m_iconWindow = NULL;
701
702 m_window = win;
703 m_widget = win->m_widget;
704 if (win->m_wxwindow) m_widget = win->m_wxwindow;
705
706 m_retValue = wxDragNone;
707
708 SetIcons(iconCopy, iconMove, iconNone);
709}
710
711wxDropSource::wxDropSource(wxDataObject& data,
712 wxWindow *win,
713 const wxIcon &iconCopy,
714 const wxIcon &iconMove,
715 const wxIcon &iconNone)
716{
717 m_waiting = true;
718
719 SetData( data );
720
721 m_iconWindow = NULL;
722
723 m_window = win;
724 m_widget = win->m_widget;
725 if (win->m_wxwindow) m_widget = win->m_wxwindow;
726
727 m_retValue = wxDragNone;
728
729 SetIcons(iconCopy, iconMove, iconNone);
730}
731
732void wxDropSource::SetIcons(const wxIcon &iconCopy,
733 const wxIcon &iconMove,
734 const wxIcon &iconNone)
735{
736 m_iconCopy = iconCopy;
737 m_iconMove = iconMove;
738 m_iconNone = iconNone;
739
740 if ( !m_iconCopy.IsOk() )
741 m_iconCopy = wxIcon(page_xpm);
742 if ( !m_iconMove.IsOk() )
743 m_iconMove = m_iconCopy;
744 if ( !m_iconNone.IsOk() )
745 m_iconNone = m_iconCopy;
746}
747
748wxDropSource::~wxDropSource()
749{
750}
751
752void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
753{
754 // get the right icon to display
755 wxIcon *icon = NULL;
756 if ( action & GDK_ACTION_MOVE )
757 icon = &m_iconMove;
758 else if ( action & GDK_ACTION_COPY )
759 icon = &m_iconCopy;
760 else
761 icon = &m_iconNone;
762
763 GdkBitmap *mask;
764 if ( icon->GetMask() )
765 mask = icon->GetMask()->GetBitmap();
766 else
767 mask = NULL;
768
769 GdkPixmap *pixmap = icon->GetPixmap();
770
771 gint width,height;
772 gdk_drawable_get_size (pixmap, &width, &height);
773
774 GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
775 gtk_widget_push_colormap (colormap);
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 gtk_widget_pop_colormap ();
782
783 gtk_widget_set_size_request (m_iconWindow, width, height);
784 gtk_widget_realize (m_iconWindow);
785
786 g_signal_connect (m_iconWindow, "configure_event",
787 G_CALLBACK (gtk_dnd_window_configure_callback), this);
788
789 gdk_window_set_back_pixmap(gtk_widget_get_window(m_iconWindow), pixmap, false);
790
791 if (mask)
792 gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
793
794 gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
795}
796
797wxDragResult wxDropSource::DoDragDrop(int flags)
798{
799 wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
800 wxT("Drop source: no data") );
801
802 // still in drag
803 if (g_blockEventsOnDrag)
804 return wxDragNone;
805
806 // don't start dragging if no button is down
807 if (g_lastButtonNumber == 0)
808 return wxDragNone;
809
810 // we can only start a drag after a mouse event
811 if (g_lastMouseEvent == NULL)
812 return wxDragNone;
813
814 GTKConnectDragSignals();
815 wxON_BLOCK_EXIT_OBJ0(*this, wxDropSource::GTKDisconnectDragSignals);
816
817 m_waiting = true;
818
819 GtkTargetList *target_list = gtk_target_list_new( NULL, 0 );
820
821 wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
822 m_data->GetAllFormats( array );
823 size_t count = m_data->GetFormatCount();
824 for (size_t i = 0; i < count; i++)
825 {
826 GdkAtom atom = array[i];
827 wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"),
828 gdk_atom_name( atom ));
829 gtk_target_list_add( target_list, atom, 0, 0 );
830 }
831 delete[] array;
832
833 int allowed_actions = GDK_ACTION_COPY;
834 if ( flags & wxDrag_AllowMove )
835 allowed_actions |= GDK_ACTION_MOVE;
836
837 // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
838 // to use a global to pass the flags to the drop target but I'd
839 // surely prefer a better way to do it
840 gs_flagsForDrag = flags;
841
842 m_retValue = wxDragCancel;
843
844 GdkDragContext *context = gtk_drag_begin( m_widget,
845 target_list,
846 (GdkDragAction)allowed_actions,
847 g_lastButtonNumber, // number of mouse button which started drag
848 (GdkEvent*) g_lastMouseEvent );
849
850 if ( !context )
851 {
852 // this can happen e.g. if gdk_pointer_grab() failed
853 return wxDragError;
854 }
855
856 m_dragContext = context;
857
858 PrepareIcon( allowed_actions, context );
859
860 while (m_waiting)
861 gtk_main_iteration();
862
863 g_signal_handlers_disconnect_by_func (m_iconWindow,
864 (gpointer) gtk_dnd_window_configure_callback, this);
865
866 return m_retValue;
867}
868
869void wxDropSource::GTKConnectDragSignals()
870{
871 if (!m_widget)
872 return;
873
874 g_blockEventsOnDrag = true;
875
876 g_signal_connect (m_widget, "drag_data_get",
877 G_CALLBACK (source_drag_data_get), this);
878 g_signal_connect (m_widget, "drag_end",
879 G_CALLBACK (source_drag_end), this);
880
881}
882
883void wxDropSource::GTKDisconnectDragSignals()
884{
885 if (!m_widget)
886 return;
887
888 g_blockEventsOnDrag = false;
889
890 g_signal_handlers_disconnect_by_func (m_widget,
891 (gpointer) source_drag_data_get,
892 this);
893 g_signal_handlers_disconnect_by_func (m_widget,
894 (gpointer) source_drag_end,
895 this);
896}
897
898#endif
899 // wxUSE_DRAG_AND_DROP
wxWidgets (Impactor)