src/gtk/dnd.cpp

   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
  30 //----------------------------------------------------------------------------
  31 // global data
  32 //----------------------------------------------------------------------------
  33
  34 extern bool g_blockEventsOnDrag;
  35
  36 // the flags used for the last DoDragDrop()
  37 static long gs_flagsForDrag = 0;
  38
  39 #ifdef __WXDEBUG__
  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 static const wxChar *TRACE_DND = _T("dnd");
  44 #endif
  45
  46 // global variables because GTK+ DnD want to have the
  47 // mouse event that caused it
  48 extern GdkEvent *g_lastMouseEvent;
  49 extern int       g_lastButtonNumber;
  50
  51 //----------------------------------------------------------------------------
  52 // standard icons
  53 //----------------------------------------------------------------------------
  54
  55 /* Copyright (c) Julian Smart */
  56 static const char * page_xpm[] = {
  57 /* columns rows colors chars-per-pixel */
  58 "32 32 37 1",
  59 "5 c #7198D9",
  60 ", c #769CDA",
  61 "2 c #DCE6F6",
  62 "i c #FFFFFF",
  63 "e c #779DDB",
  64 ": c #9AB6E4",
  65 "9 c #EAF0FA",
  66 "- c #B1C7EB",
  67 "$ c #6992D7",
  68 "y c #F7F9FD",
  69 "= c #BED0EE",
  70 "q c #F0F5FC",
  71 "; c #A8C0E8",
  72 "@ c #366BC2",
  73 "  c None",
  74 "u c #FDFEFF",
  75 "8 c #5987D3",
  76 "* c #C4D5F0",
  77 "7 c #7CA0DC",
  78 "O c #487BCE",
  79 "< c #6B94D7",
  80 "& c #CCDAF2",
  81 "> c #89A9DF",
  82 "3 c #5584D1",
  83 "w c #82A5DE",
  84 "1 c #3F74CB",
  85 "+ c #3A70CA",
  86 ". c #3569BF",
  87 "% c #D2DFF4",
  88 "# c #3366BB",
  89 "r c #F5F8FD",
  90 "0 c #FAFCFE",
  91 "4 c #DFE8F7",
  92 "X c #5E8AD4",
  93 "o c #5282D0",
  94 "t c #B8CCEC",
  95 "6 c #E5EDF9",
  96 /* pixels */
  97 "                                ",
  98 "                                ",
  99 "                                ",
 100 "                                ",
 101 "                                ",
 102 "       .XXXooOO++@#             ",
 103 "       $%&*=-;::>,<1            ",
 104 "       $2%&*=-;::><:3           ",
 105 "       $42%&*=-;::<&:3          ",
 106 "       56477<<<<8<<9&:X         ",
 107 "       59642%&*=-;<09&:5        ",
 108 "       5q9642%&*=-<<<<<#        ",
 109 "       5qqw777<<<<<88:>+        ",
 110 "       erqq9642%&*=t;::+        ",
 111 "       eyrqq9642%&*=t;:O        ",
 112 "       eyywwww777<<<<t;O        ",
 113 "       e0yyrqq9642%&*=to        ",
 114 "       e00yyrqq9642%&*=o        ",
 115 "       eu0wwwwwww777<&*X        ",
 116 "       euu00yyrqq9642%&X        ",
 117 "       eiuu00yyrqq9642%X        ",
 118 "       eiiwwwwwwwwww742$        ",
 119 "       eiiiuu00yyrqq964$        ",
 120 "       eiiiiuu00yyrqq96$        ",
 121 "       eiiiiiuu00yyrqq95        ",
 122 "       eiiiiiiuu00yyrqq5        ",
 123 "       eeeeeeeeeeeeee55e        ",
 124 "                                ",
 125 "                                ",
 126 "                                ",
 127 "                                ",
 128 "                                "
 129 };
 130
 131
 132 // ============================================================================
 133 // private functions
 134 // ============================================================================
 135
 136 // ----------------------------------------------------------------------------
 137 // convert between GTK+ and wxWidgets DND constants
 138 // ----------------------------------------------------------------------------
 139
 140 static wxDragResult ConvertFromGTK(long action)
 141 {
 142     switch ( action )
 143     {
 144         case GDK_ACTION_COPY:
 145             return wxDragCopy;
 146
 147         case GDK_ACTION_LINK:
 148             return wxDragLink;
 149
 150         case GDK_ACTION_MOVE:
 151             return wxDragMove;
 152     }
 153
 154     return wxDragNone;
 155 }
 156
 157 // ----------------------------------------------------------------------------
 158 // "drag_leave"
 159 // ----------------------------------------------------------------------------
 160
 161 extern "C" {
 162 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 163                                GdkDragContext *context,
 164                                guint WXUNUSED(time),
 165                                wxDropTarget *drop_target )
 166 {
 167     /* inform the wxDropTarget about the current GdkDragContext.
 168        this is only valid for the duration of this call */
 169     drop_target->SetDragContext( context );
 170
 171     /* we don't need return values. this event is just for
 172        information */
 173     drop_target->OnLeave();
 174
 175     /* this has to be done because GDK has no "drag_enter" event */
 176     drop_target->m_firstMotion = true;
 177
 178     /* after this, invalidate the drop_target's GdkDragContext */
 179     drop_target->SetDragContext( NULL );
 180 }
 181 }
 182
 183 // ----------------------------------------------------------------------------
 184 // "drag_motion"
 185 // ----------------------------------------------------------------------------
 186
 187 extern "C" {
 188 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 189                                     GdkDragContext *context,
 190                                     gint x,
 191                                     gint y,
 192                                     guint time,
 193                                     wxDropTarget *drop_target )
 194 {
 195     /* Owen Taylor: "if the coordinates not in a drop zone,
 196        return FALSE, otherwise call gtk_drag_status() and
 197        return TRUE" */
 198
 199 #if 0
 200     wxPrintf( "motion\n" );
 201     GList *tmp_list;
 202     for (tmp_list = context->targets; tmp_list; tmp_list = tmp_list->next)
 203     {
 204         wxString atom = wxString::FromAscii( gdk_atom_name (GDK_POINTER_TO_ATOM (tmp_list->data)) );
 205         wxPrintf( "Atom: %s\n", atom );
 206     }
 207 #endif
 208
 209     /* inform the wxDropTarget about the current GdkDragContext.
 210        this is only valid for the duration of this call */
 211     drop_target->SetDragContext( context );
 212
 213     // GTK+ always supposes that we want to copy the data by default while we
 214     // might want to move it, so examine not only suggested_action - which is
 215     // only good if we don't have our own preferences - but also the actions
 216     // field
 217     wxDragResult result;
 218     if (drop_target->GetDefaultAction() == wxDragNone)
 219     {
 220         // use default action set by wxDropSource::DoDragDrop()
 221         if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 222             (context->actions & GDK_ACTION_MOVE ) )
 223         {
 224              // move is requested by the program and allowed by GTK+ - do it, even
 225             // though suggested_action may be currently wxDragCopy
 226             result = wxDragMove;
 227         }
 228         else // use whatever GTK+ says we should
 229         {
 230             result = ConvertFromGTK(context->suggested_action);
 231
 232             if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 233             {
 234                 // we're requested to move but we can't
 235                 result = wxDragCopy;
 236             }
 237         }
 238     }
 239     else if (drop_target->GetDefaultAction() == wxDragMove &&
 240                 (context->actions & GDK_ACTION_MOVE))
 241     {
 242
 243        result = wxDragMove;
 244     }
 245     else
 246     {
 247         if (context->actions & GDK_ACTION_COPY)
 248             result = wxDragCopy;
 249         else if (context->actions & GDK_ACTION_MOVE)
 250             result = wxDragMove;
 251         else
 252             result = wxDragNone;
 253     }
 254
 255     if (drop_target->m_firstMotion)
 256     {
 257         /* the first "drag_motion" event substitutes a "drag_enter" event */
 258         result = drop_target->OnEnter( x, y, result );
 259     }
 260     else
 261     {
 262         /* give program a chance to react (i.e. to say no by returning FALSE) */
 263         result = drop_target->OnDragOver( x, y, result );
 264     }
 265
 266     bool ret = wxIsDragResultOk( result );
 267     if (ret)
 268     {
 269         GdkDragAction action;
 270         if (result == wxDragCopy)
 271             action = GDK_ACTION_COPY;
 272         else if (result == wxDragLink)
 273             action = GDK_ACTION_LINK;
 274         else
 275             action = GDK_ACTION_MOVE;
 276
 277         gdk_drag_status( context, action, time );
 278     }
 279
 280     /* after this, invalidate the drop_target's GdkDragContext */
 281     drop_target->SetDragContext( NULL );
 282
 283     /* this has to be done because GDK has no "drag_enter" event */
 284     drop_target->m_firstMotion = false;
 285
 286     return ret;
 287 }
 288 }
 289
 290 // ----------------------------------------------------------------------------
 291 // "drag_drop"
 292 // ----------------------------------------------------------------------------
 293
 294 extern "C" {
 295 static gboolean target_drag_drop( GtkWidget *widget,
 296                                   GdkDragContext *context,
 297                                   gint x,
 298                                   gint y,
 299                                   guint time,
 300                                   wxDropTarget *drop_target )
 301 {
 302     /* Owen Taylor: "if the drop is not in a drop zone,
 303        return FALSE, otherwise, if you aren't accepting
 304        the drop, call gtk_drag_finish() with success == FALSE
 305        otherwise call gtk_drag_data_get()" */
 306
 307     /* this seems to make a difference between not accepting
 308        due to wrong target area and due to wrong format. let
 309        us hope that this is not required.. */
 310
 311     /* inform the wxDropTarget about the current GdkDragContext.
 312        this is only valid for the duration of this call */
 313     drop_target->SetDragContext( context );
 314
 315     /* inform the wxDropTarget about the current drag widget.
 316        this is only valid for the duration of this call */
 317     drop_target->SetDragWidget( widget );
 318
 319     /* inform the wxDropTarget about the current drag time.
 320        this is only valid for the duration of this call */
 321     drop_target->SetDragTime( time );
 322
 323 /*
 324     wxDragResult result = wxDragMove;
 325     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 326 */
 327
 328     /* reset the block here as someone might very well
 329        show a dialog as a reaction to a drop and this
 330        wouldn't work without events */
 331     g_blockEventsOnDrag = false;
 332
 333     bool ret = drop_target->OnDrop( x, y );
 334
 335     if (!ret)
 336     {
 337 #ifdef __WXDEBUG__
 338         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 339 #endif
 340
 341         /* cancel the whole thing */
 342         gtk_drag_finish( context,
 343                           FALSE,        /* no success */
 344                           FALSE,        /* don't delete data on dropping side */
 345                           time );
 346     }
 347     else
 348     {
 349 #ifdef __WXDEBUG__
 350         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned true") );
 351 #endif
 352
 353 #if wxUSE_THREADS
 354         /* disable GUI threads */
 355 #endif
 356
 357         GdkAtom format = drop_target->GetMatchingPair();
 358
 359         // this does happen somehow, see bug 555111
 360         wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") );
 361
 362 /*
 363         GdkDragAction action = GDK_ACTION_MOVE;
 364         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 365         context->action = action;
 366 */
 367         /* this should trigger an "drag_data_received" event */
 368         gtk_drag_get_data( widget,
 369                            context,
 370                            format,
 371                            time );
 372
 373 #if wxUSE_THREADS
 374         /* re-enable GUI threads */
 375 #endif
 376     }
 377
 378     /* after this, invalidate the drop_target's GdkDragContext */
 379     drop_target->SetDragContext( NULL );
 380
 381     /* after this, invalidate the drop_target's drag widget */
 382     drop_target->SetDragWidget( NULL );
 383
 384     /* this has to be done because GDK has no "drag_enter" event */
 385     drop_target->m_firstMotion = true;
 386
 387     return ret;
 388 }
 389 }
 390
 391 // ----------------------------------------------------------------------------
 392 // "drag_data_received"
 393 // ----------------------------------------------------------------------------
 394
 395 extern "C" {
 396 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 397                                        GdkDragContext *context,
 398                                        gint x,
 399                                        gint y,
 400                                        GtkSelectionData *data,
 401                                        guint WXUNUSED(info),
 402                                        guint time,
 403                                        wxDropTarget *drop_target )
 404 {
 405     /* Owen Taylor: "call gtk_drag_finish() with
 406        success == TRUE" */
 407
 408     if ((data->length <= 0) || (data->format != 8))
 409     {
 410         /* negative data length and non 8-bit data format
 411            qualifies for junk */
 412         gtk_drag_finish (context, FALSE, FALSE, time);
 413
 414         return;
 415     }
 416
 417 #ifdef __WXDEBUG__
 418     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 419 #endif
 420
 421     /* inform the wxDropTarget about the current GtkSelectionData.
 422        this is only valid for the duration of this call */
 423     drop_target->SetDragData( data );
 424
 425     wxDragResult result = ConvertFromGTK(context->action);
 426
 427     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 428     {
 429 #ifdef __WXDEBUG__
 430         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned true") );
 431 #endif
 432
 433         /* tell GTK that data transfer was successful */
 434         gtk_drag_finish( context, TRUE, FALSE, time );
 435     }
 436     else
 437     {
 438 #ifdef __WXDEBUG__
 439         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 440 #endif
 441
 442         /* tell GTK that data transfer was not successful */
 443         gtk_drag_finish( context, FALSE, FALSE, time );
 444     }
 445
 446     /* after this, invalidate the drop_target's drag data */
 447     drop_target->SetDragData( NULL );
 448 }
 449 }
 450
 451 //----------------------------------------------------------------------------
 452 // wxDropTarget
 453 //----------------------------------------------------------------------------
 454
 455 wxDropTarget::wxDropTarget( wxDataObject *data )
 456             : wxDropTargetBase( data )
 457 {
 458     m_firstMotion = true;
 459     m_dragContext = NULL;
 460     m_dragWidget = NULL;
 461     m_dragData = NULL;
 462     m_dragTime = 0;
 463 }
 464
 465 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 466                                        wxCoord WXUNUSED(y),
 467                                        wxDragResult def )
 468 {
 469     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 470
 471     // disable the debug message from GetMatchingPair() - there are too many
 472     // of them otherwise
 473 #ifdef __WXDEBUG__
 474     wxLogNull noLog;
 475 #endif // Debug
 476
 477     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 478 }
 479
 480 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 481 {
 482     if (!m_dataObject)
 483         return false;
 484
 485     return (GetMatchingPair() != (GdkAtom) 0);
 486 }
 487
 488 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 489                                    wxDragResult def )
 490 {
 491     if (!m_dataObject)
 492         return wxDragNone;
 493
 494     if (GetMatchingPair() == (GdkAtom) 0)
 495         return wxDragNone;
 496
 497     return GetData() ? def : wxDragNone;
 498 }
 499
 500 GdkAtom wxDropTarget::GetMatchingPair()
 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 #ifdef __WXDEBUG__
 515         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 516                    format.GetId().c_str());
 517 #endif // Debug
 518
 519         if (m_dataObject->IsSupportedFormat( format ))
 520             return formatAtom;
 521
 522         child = child->next;
 523     }
 524
 525     return (GdkAtom) 0;
 526 }
 527
 528 bool wxDropTarget::GetData()
 529 {
 530     if (!m_dragData)
 531         return false;
 532
 533     if (!m_dataObject)
 534         return false;
 535
 536     wxDataFormat dragFormat( m_dragData->target );
 537
 538     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 539         return false;
 540
 541     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 542
 543     return true;
 544 }
 545
 546 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 547 {
 548     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 549
 550     gtk_drag_dest_unset( widget );
 551
 552     g_signal_handlers_disconnect_by_func (widget,
 553                                           (gpointer) target_drag_leave, this);
 554     g_signal_handlers_disconnect_by_func (widget,
 555                                           (gpointer) target_drag_motion, this);
 556     g_signal_handlers_disconnect_by_func (widget,
 557                                           (gpointer) target_drag_drop, this);
 558     g_signal_handlers_disconnect_by_func (widget,
 559                                           (gpointer) target_drag_data_received, this);
 560 }
 561
 562 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 563 {
 564     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 565
 566     /* gtk_drag_dest_set() determines what default behaviour we'd like
 567        GTK to supply. we don't want to specify out targets (=formats)
 568        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 569        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 570        "drag_motion" and "drag_drop" events. this makes it possible
 571        to allow dropping on only a small area. we should set
 572        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 573        highlighting if dragging over standard controls, but this
 574        seems to be broken without the other two. */
 575
 576     gtk_drag_dest_set( widget,
 577                        (GtkDestDefaults) 0,         /* no default behaviour */
 578                        NULL,      /* we don't supply any formats here */
 579                        0,                           /* number of targets = 0 */
 580                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 581
 582     g_signal_connect (widget, "drag_leave",
 583                       G_CALLBACK (target_drag_leave), this);
 584
 585     g_signal_connect (widget, "drag_motion",
 586                       G_CALLBACK (target_drag_motion), this);
 587
 588     g_signal_connect (widget, "drag_drop",
 589                       G_CALLBACK (target_drag_drop), this);
 590
 591     g_signal_connect (widget, "drag_data_received",
 592                       G_CALLBACK (target_drag_data_received), this);
 593 }
 594
 595 //----------------------------------------------------------------------------
 596 // "drag_data_get"
 597 //----------------------------------------------------------------------------
 598
 599 extern "C" {
 600 static void
 601 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 602                        GdkDragContext     *WXUNUSED(context),
 603                        GtkSelectionData   *selection_data,
 604                        guint               WXUNUSED(info),
 605                        guint               WXUNUSED(time),
 606                        wxDropSource       *drop_source )
 607 {
 608     wxDataFormat format( selection_data->target );
 609
 610 #ifdef __WXDEBUG__
 611     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 612                format.GetId().c_str());
 613 #endif
 614
 615     drop_source->m_retValue = wxDragCancel;
 616
 617     wxDataObject *data = drop_source->GetDataObject();
 618
 619     if (!data)
 620     {
 621 #ifdef __WXDEBUG__
 622         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 623 #endif
 624        return;
 625     }
 626
 627     if (!data->IsSupportedFormat(format))
 628     {
 629 #ifdef __WXDEBUG__
 630         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 631 #endif
 632        return;
 633     }
 634
 635     if (data->GetDataSize(format) == 0)
 636     {
 637 #ifdef __WXDEBUG__
 638         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 639 #endif
 640        return;
 641     }
 642
 643     size_t size = data->GetDataSize(format);
 644
 645 //  printf( "data size: %d.\n", (int)data_size );
 646
 647     guchar *d = new guchar[size];
 648
 649     if (!data->GetDataHere( format, (void*)d ))
 650     {
 651         delete[] d;
 652         return;
 653     }
 654
 655 #if wxUSE_THREADS
 656     /* disable GUI threads */
 657 #endif
 658
 659     gtk_selection_data_set( selection_data,
 660                             selection_data->target,
 661                             8,   // 8-bit
 662                             d,
 663                             size );
 664
 665 #if wxUSE_THREADS
 666     /* enable GUI threads */
 667 #endif
 668
 669     delete[] d;
 670 }
 671 }
 672
 673 //----------------------------------------------------------------------------
 674 // "drag_end"
 675 //----------------------------------------------------------------------------
 676
 677 extern "C" {
 678 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 679                              GdkDragContext     *WXUNUSED(context),
 680                              wxDropSource       *drop_source )
 681 {
 682     // printf( "Drag source: drag_end.\n" );
 683
 684     drop_source->m_waiting = false;
 685 }
 686 }
 687
 688 //-----------------------------------------------------------------------------
 689 // "configure_event" from m_iconWindow
 690 //-----------------------------------------------------------------------------
 691
 692 extern "C" {
 693 static gint
 694 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 695 {
 696     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 697
 698     return 0;
 699 }
 700 }
 701
 702 //---------------------------------------------------------------------------
 703 // wxDropSource
 704 //---------------------------------------------------------------------------
 705
 706 wxDropSource::wxDropSource(wxWindow *win,
 707                            const wxIcon &iconCopy,
 708                            const wxIcon &iconMove,
 709                            const wxIcon &iconNone)
 710 {
 711     m_waiting = true;
 712
 713     m_iconWindow = NULL;
 714
 715     m_window = win;
 716     m_widget = win->m_widget;
 717     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 718
 719     m_retValue = wxDragCancel;
 720
 721     SetIcons(iconCopy, iconMove, iconNone);
 722 }
 723
 724 wxDropSource::wxDropSource(wxDataObject& data,
 725                            wxWindow *win,
 726                            const wxIcon &iconCopy,
 727                            const wxIcon &iconMove,
 728                            const wxIcon &iconNone)
 729 {
 730     m_waiting = true;
 731
 732     SetData( data );
 733
 734     m_iconWindow = NULL;
 735
 736     m_window = win;
 737     m_widget = win->m_widget;
 738     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 739
 740     m_retValue = wxDragCancel;
 741
 742     SetIcons(iconCopy, iconMove, iconNone);
 743 }
 744
 745 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 746                             const wxIcon &iconMove,
 747                             const wxIcon &iconNone)
 748 {
 749     m_iconCopy = iconCopy;
 750     m_iconMove = iconMove;
 751     m_iconNone = iconNone;
 752
 753     if ( !m_iconCopy.Ok() )
 754         m_iconCopy = wxIcon(page_xpm);
 755     if ( !m_iconMove.Ok() )
 756         m_iconMove = m_iconCopy;
 757     if ( !m_iconNone.Ok() )
 758         m_iconNone = m_iconCopy;
 759 }
 760
 761 wxDropSource::~wxDropSource()
 762 {
 763 }
 764
 765 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 766 {
 767     // get the right icon to display
 768     wxIcon *icon = NULL;
 769     if ( action & GDK_ACTION_MOVE )
 770         icon = &m_iconMove;
 771     else if ( action & GDK_ACTION_COPY )
 772         icon = &m_iconCopy;
 773     else
 774         icon = &m_iconNone;
 775
 776     GdkBitmap *mask;
 777     if ( icon->GetMask() )
 778         mask = icon->GetMask()->GetBitmap();
 779     else
 780         mask = NULL;
 781
 782     GdkPixmap *pixmap = icon->GetPixmap();
 783
 784     gint width,height;
 785     gdk_drawable_get_size (pixmap, &width, &height);
 786
 787     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 788     gtk_widget_push_colormap (colormap);
 789
 790     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 791     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 792     gtk_widget_set_app_paintable (m_iconWindow, TRUE);
 793
 794     gtk_widget_pop_colormap ();
 795
 796     gtk_widget_set_size_request (m_iconWindow, width, height);
 797     gtk_widget_realize (m_iconWindow);
 798
 799     g_signal_connect (m_iconWindow, "configure_event",
 800                       G_CALLBACK (gtk_dnd_window_configure_callback), this);
 801
 802     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 803
 804     if (mask)
 805         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 806
 807     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 808 }
 809
 810 wxDragResult wxDropSource::DoDragDrop(int flags)
 811 {
 812     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 813                  wxT("Drop source: no data") );
 814
 815     // still in drag
 816     if (g_blockEventsOnDrag)
 817         return wxDragNone;
 818
 819     // don't start dragging if no button is down
 820     if (g_lastButtonNumber == 0)
 821         return wxDragNone;
 822
 823     // we can only start a drag after a mouse event
 824     if (g_lastMouseEvent == NULL)
 825         return wxDragNone;
 826
 827     GTKConnectDragSignals();
 828     wxON_BLOCK_EXIT_OBJ0(*this, wxDropSource::GTKDisconnectDragSignals);
 829
 830     m_waiting = true;
 831
 832     GtkTargetList *target_list = gtk_target_list_new( NULL, 0 );
 833
 834     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 835     m_data->GetAllFormats( array );
 836     size_t count = m_data->GetFormatCount();
 837     for (size_t i = 0; i < count; i++)
 838     {
 839         GdkAtom atom = array[i];
 840 #ifdef __WXDEBUG__
 841         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 842 #endif
 843        gtk_target_list_add( target_list, atom, 0, 0 );
 844     }
 845     delete[] array;
 846
 847     int action = GDK_ACTION_COPY;
 848     if ( flags & wxDrag_AllowMove )
 849         action |= GDK_ACTION_MOVE;
 850
 851     // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 852     //     to use a global to pass the flags to the drop target but I'd
 853     //     surely prefer a better way to do it
 854     gs_flagsForDrag = flags;
 855
 856     GdkDragContext *context = gtk_drag_begin( m_widget,
 857                 target_list,
 858                 (GdkDragAction)action,
 859                 g_lastButtonNumber,  // number of mouse button which started drag
 860                 (GdkEvent*) g_lastMouseEvent );
 861
 862     if ( !context )
 863     {
 864         // this can happen e.g. if gdk_pointer_grab() failed
 865         return wxDragError;
 866     }
 867
 868     m_dragContext = context;
 869
 870     PrepareIcon( action, context );
 871
 872     while (m_waiting)
 873         gtk_main_iteration();
 874
 875     m_retValue = ConvertFromGTK(context->action);
 876     if ( m_retValue == wxDragNone )
 877          m_retValue = wxDragCancel;
 878
 879     return m_retValue;
 880 }
 881
 882 void wxDropSource::GTKConnectDragSignals()
 883 {
 884     if (!m_widget)
 885         return;
 886
 887     g_blockEventsOnDrag = true;
 888
 889     g_signal_connect (m_widget, "drag_data_get",
 890                       G_CALLBACK (source_drag_data_get), this);
 891     g_signal_connect (m_widget, "drag_end",
 892                       G_CALLBACK (source_drag_end), this);
 893
 894 }
 895
 896 void wxDropSource::GTKDisconnectDragSignals()
 897 {
 898     if (!m_widget)
 899         return;
 900
 901     g_blockEventsOnDrag = false;
 902
 903     g_signal_handlers_disconnect_by_func (m_widget,
 904                                           (gpointer) source_drag_data_get,
 905                                           this);
 906     g_signal_handlers_disconnect_by_func (m_widget,
 907                                           (gpointer) source_drag_end,
 908                                           this);
 909 }
 910
 911 #endif
 912       // wxUSE_DRAG_AND_DROP