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 // the trace mask we use with wxLogTrace() - call
  40 // wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
  41 // (there are quite a few of them, so don't enable this by default)
  42 #define TRACE_DND "dnd"
  43
  44 // global variables because GTK+ DnD want to have the
  45 // mouse event that caused it
  46 extern GdkEvent *g_lastMouseEvent;
  47 extern int       g_lastButtonNumber;
  48
  49 //----------------------------------------------------------------------------
  50 // standard icons
  51 //----------------------------------------------------------------------------
  52
  53 /* Copyright (c) Julian Smart */
  54 static const char * page_xpm[] = {
  55 /* columns rows colors chars-per-pixel */
  56 "32 32 37 1",
  57 "5 c #7198D9",
  58 ", c #769CDA",
  59 "2 c #DCE6F6",
  60 "i c #FFFFFF",
  61 "e c #779DDB",
  62 ": c #9AB6E4",
  63 "9 c #EAF0FA",
  64 "- c #B1C7EB",
  65 "$ c #6992D7",
  66 "y c #F7F9FD",
  67 "= c #BED0EE",
  68 "q c #F0F5FC",
  69 "; c #A8C0E8",
  70 "@ c #366BC2",
  71 "  c None",
  72 "u c #FDFEFF",
  73 "8 c #5987D3",
  74 "* c #C4D5F0",
  75 "7 c #7CA0DC",
  76 "O c #487BCE",
  77 "< c #6B94D7",
  78 "& c #CCDAF2",
  79 "> c #89A9DF",
  80 "3 c #5584D1",
  81 "w c #82A5DE",
  82 "1 c #3F74CB",
  83 "+ c #3A70CA",
  84 ". c #3569BF",
  85 "% c #D2DFF4",
  86 "# c #3366BB",
  87 "r c #F5F8FD",
  88 "0 c #FAFCFE",
  89 "4 c #DFE8F7",
  90 "X c #5E8AD4",
  91 "o c #5282D0",
  92 "t c #B8CCEC",
  93 "6 c #E5EDF9",
  94 /* pixels */
  95 "                                ",
  96 "                                ",
  97 "                                ",
  98 "                                ",
  99 "                                ",
 100 "       .XXXooOO++@#             ",
 101 "       $%&*=-;::>,<1            ",
 102 "       $2%&*=-;::><:3           ",
 103 "       $42%&*=-;::<&:3          ",
 104 "       56477<<<<8<<9&:X         ",
 105 "       59642%&*=-;<09&:5        ",
 106 "       5q9642%&*=-<<<<<#        ",
 107 "       5qqw777<<<<<88:>+        ",
 108 "       erqq9642%&*=t;::+        ",
 109 "       eyrqq9642%&*=t;:O        ",
 110 "       eyywwww777<<<<t;O        ",
 111 "       e0yyrqq9642%&*=to        ",
 112 "       e00yyrqq9642%&*=o        ",
 113 "       eu0wwwwwww777<&*X        ",
 114 "       euu00yyrqq9642%&X        ",
 115 "       eiuu00yyrqq9642%X        ",
 116 "       eiiwwwwwwwwww742$        ",
 117 "       eiiiuu00yyrqq964$        ",
 118 "       eiiiiuu00yyrqq96$        ",
 119 "       eiiiiiuu00yyrqq95        ",
 120 "       eiiiiiiuu00yyrqq5        ",
 121 "       eeeeeeeeeeeeee55e        ",
 122 "                                ",
 123 "                                ",
 124 "                                ",
 125 "                                ",
 126 "                                "
 127 };
 128
 129
 130 // ============================================================================
 131 // private functions
 132 // ============================================================================
 133
 134 // ----------------------------------------------------------------------------
 135 // convert between GTK+ and wxWidgets DND constants
 136 // ----------------------------------------------------------------------------
 137
 138 static wxDragResult ConvertFromGTK(long action)
 139 {
 140     switch ( action )
 141     {
 142         case GDK_ACTION_COPY:
 143             return wxDragCopy;
 144
 145         case GDK_ACTION_LINK:
 146             return wxDragLink;
 147
 148         case GDK_ACTION_MOVE:
 149             return wxDragMove;
 150     }
 151
 152     return wxDragNone;
 153 }
 154
 155 // ----------------------------------------------------------------------------
 156 // "drag_leave"
 157 // ----------------------------------------------------------------------------
 158
 159 extern "C" {
 160 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 161                                GdkDragContext *context,
 162                                guint WXUNUSED(time),
 163                                wxDropTarget *drop_target )
 164 {
 165     /* inform the wxDropTarget about the current GdkDragContext.
 166        this is only valid for the duration of this call */
 167     drop_target->GtkSetDragContext( context );
 168
 169     /* we don't need return values. this event is just for
 170        information */
 171     drop_target->OnLeave();
 172
 173     /* this has to be done because GDK has no "drag_enter" event */
 174     drop_target->m_firstMotion = true;
 175
 176     /* after this, invalidate the drop_target's GdkDragContext */
 177     drop_target->GtkSetDragContext( NULL );
 178 }
 179 }
 180
 181 // ----------------------------------------------------------------------------
 182 // "drag_motion"
 183 // ----------------------------------------------------------------------------
 184
 185 extern "C" {
 186 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 187                                     GdkDragContext *context,
 188                                     gint x,
 189                                     gint y,
 190                                     guint time,
 191                                     wxDropTarget *drop_target )
 192 {
 193     /* Owen Taylor: "if the coordinates not in a drop zone,
 194        return FALSE, otherwise call gtk_drag_status() and
 195        return TRUE" */
 196
 197 #if 0
 198     wxPrintf( "motion\n" );
 199     GList *tmp_list;
 200     for (tmp_list = context->targets; tmp_list; tmp_list = tmp_list->next)
 201     {
 202         wxString atom = wxString::FromAscii( gdk_atom_name (GDK_POINTER_TO_ATOM (tmp_list->data)) );
 203         wxPrintf( "Atom: %s\n", atom );
 204     }
 205 #endif
 206
 207     /* inform the wxDropTarget about the current GdkDragContext.
 208        this is only valid for the duration of this call */
 209     drop_target->GtkSetDragContext( context );
 210
 211     // GTK+ always supposes that we want to copy the data by default while we
 212     // might want to move it, so examine not only suggested_action - which is
 213     // only good if we don't have our own preferences - but also the actions
 214     // field
 215     wxDragResult result;
 216     if (drop_target->GetDefaultAction() == wxDragNone)
 217     {
 218         // use default action set by wxDropSource::DoDragDrop()
 219         if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 220             (context->actions & GDK_ACTION_MOVE ) )
 221         {
 222              // move is requested by the program and allowed by GTK+ - do it, even
 223             // though suggested_action may be currently wxDragCopy
 224             result = wxDragMove;
 225         }
 226         else // use whatever GTK+ says we should
 227         {
 228             result = ConvertFromGTK(context->suggested_action);
 229
 230             if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 231             {
 232                 // we're requested to move but we can't
 233                 result = wxDragCopy;
 234             }
 235         }
 236     }
 237     else if (drop_target->GetDefaultAction() == wxDragMove &&
 238                 (context->actions & GDK_ACTION_MOVE))
 239     {
 240
 241        result = wxDragMove;
 242     }
 243     else
 244     {
 245         if (context->actions & GDK_ACTION_COPY)
 246             result = wxDragCopy;
 247         else if (context->actions & GDK_ACTION_MOVE)
 248             result = wxDragMove;
 249         else
 250             result = wxDragNone;
 251     }
 252
 253     if (drop_target->m_firstMotion)
 254     {
 255         /* the first "drag_motion" event substitutes a "drag_enter" event */
 256         result = drop_target->OnEnter( x, y, result );
 257     }
 258     else
 259     {
 260         /* give program a chance to react (i.e. to say no by returning FALSE) */
 261         result = drop_target->OnDragOver( x, y, result );
 262     }
 263
 264     bool ret = wxIsDragResultOk( result );
 265     if (ret)
 266     {
 267         GdkDragAction action;
 268         if (result == wxDragCopy)
 269             action = GDK_ACTION_COPY;
 270         else if (result == wxDragLink)
 271             action = GDK_ACTION_LINK;
 272         else
 273             action = GDK_ACTION_MOVE;
 274
 275         gdk_drag_status( context, action, time );
 276     }
 277
 278     /* after this, invalidate the drop_target's GdkDragContext */
 279     drop_target->GtkSetDragContext( NULL );
 280
 281     /* this has to be done because GDK has no "drag_enter" event */
 282     drop_target->m_firstMotion = false;
 283
 284     return ret;
 285 }
 286 }
 287
 288 // ----------------------------------------------------------------------------
 289 // "drag_drop"
 290 // ----------------------------------------------------------------------------
 291
 292 extern "C" {
 293 static gboolean target_drag_drop( GtkWidget *widget,
 294                                   GdkDragContext *context,
 295                                   gint x,
 296                                   gint y,
 297                                   guint time,
 298                                   wxDropTarget *drop_target )
 299 {
 300     /* Owen Taylor: "if the drop is not in a drop zone,
 301        return FALSE, otherwise, if you aren't accepting
 302        the drop, call gtk_drag_finish() with success == FALSE
 303        otherwise call gtk_drag_data_get()" */
 304
 305     /* this seems to make a difference between not accepting
 306        due to wrong target area and due to wrong format. let
 307        us hope that this is not required.. */
 308
 309     /* inform the wxDropTarget about the current GdkDragContext.
 310        this is only valid for the duration of this call */
 311     drop_target->GtkSetDragContext( context );
 312
 313     /* inform the wxDropTarget about the current drag widget.
 314        this is only valid for the duration of this call */
 315     drop_target->GtkSetDragWidget( widget );
 316
 317     /* inform the wxDropTarget about the current drag time.
 318        this is only valid for the duration of this call */
 319     drop_target->GtkSetDragTime( time );
 320
 321 /*
 322     wxDragResult result = wxDragMove;
 323     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 324 */
 325
 326     /* reset the block here as someone might very well
 327        show a dialog as a reaction to a drop and this
 328        wouldn't work without events */
 329     g_blockEventsOnDrag = false;
 330
 331     bool ret = drop_target->OnDrop( x, y );
 332
 333     if (!ret)
 334     {
 335         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 336
 337         /* cancel the whole thing */
 338         gtk_drag_finish( context,
 339                           FALSE,        /* no success */
 340                           FALSE,        /* don't delete data on dropping side */
 341                           time );
 342     }
 343     else
 344     {
 345         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned true") );
 346
 347 #if wxUSE_THREADS
 348         /* disable GUI threads */
 349 #endif
 350
 351         GdkAtom format = drop_target->GtkGetMatchingPair();
 352
 353         // this does happen somehow, see bug 555111
 354         wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") );
 355
 356 /*
 357         GdkDragAction action = GDK_ACTION_MOVE;
 358         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 359         context->action = action;
 360 */
 361         /* this should trigger an "drag_data_received" event */
 362         gtk_drag_get_data( widget,
 363                            context,
 364                            format,
 365                            time );
 366
 367 #if wxUSE_THREADS
 368         /* re-enable GUI threads */
 369 #endif
 370     }
 371
 372     /* after this, invalidate the drop_target's GdkDragContext */
 373     drop_target->GtkSetDragContext( NULL );
 374
 375     /* after this, invalidate the drop_target's drag widget */
 376     drop_target->GtkSetDragWidget( NULL );
 377
 378     /* this has to be done because GDK has no "drag_enter" event */
 379     drop_target->m_firstMotion = true;
 380
 381     return ret;
 382 }
 383 }
 384
 385 // ----------------------------------------------------------------------------
 386 // "drag_data_received"
 387 // ----------------------------------------------------------------------------
 388
 389 extern "C" {
 390 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 391                                        GdkDragContext *context,
 392                                        gint x,
 393                                        gint y,
 394                                        GtkSelectionData *data,
 395                                        guint WXUNUSED(info),
 396                                        guint time,
 397                                        wxDropTarget *drop_target )
 398 {
 399     /* Owen Taylor: "call gtk_drag_finish() with
 400        success == TRUE" */
 401
 402     if ((data->length <= 0) || (data->format != 8))
 403     {
 404         /* negative data length and non 8-bit data format
 405            qualifies for junk */
 406         gtk_drag_finish (context, FALSE, FALSE, time);
 407
 408         return;
 409     }
 410
 411     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 412
 413     /* inform the wxDropTarget about the current GtkSelectionData.
 414        this is only valid for the duration of this call */
 415     drop_target->GtkSetDragData( data );
 416
 417     wxDragResult result = ConvertFromGTK(context->action);
 418
 419     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 420     {
 421         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned true") );
 422
 423         /* tell GTK that data transfer was successful */
 424         gtk_drag_finish( context, TRUE, FALSE, time );
 425     }
 426     else
 427     {
 428         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 429
 430         /* tell GTK that data transfer was not successful */
 431         gtk_drag_finish( context, FALSE, FALSE, time );
 432     }
 433
 434     /* after this, invalidate the drop_target's drag data */
 435     drop_target->GtkSetDragData( NULL );
 436 }
 437 }
 438
 439 //----------------------------------------------------------------------------
 440 // wxDropTarget
 441 //----------------------------------------------------------------------------
 442
 443 wxDropTarget::wxDropTarget( wxDataObject *data )
 444             : wxDropTargetBase( data )
 445 {
 446     m_firstMotion = true;
 447     m_dragContext = NULL;
 448     m_dragWidget = NULL;
 449     m_dragData = NULL;
 450     m_dragTime = 0;
 451 }
 452
 453 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 454                                        wxCoord WXUNUSED(y),
 455                                        wxDragResult def )
 456 {
 457     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 458
 459     // disable the trace message from GetMatchingPair() by passing true to it
 460     // (there are just too many of them otherwise)
 461     return (GtkGetMatchingPair(true) != (GdkAtom) 0) ? def : wxDragNone;
 462 }
 463
 464 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 465 {
 466     if (!m_dataObject)
 467         return false;
 468
 469     return (GtkGetMatchingPair() != (GdkAtom) 0);
 470 }
 471
 472 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 473                                    wxDragResult def )
 474 {
 475     if (!m_dataObject)
 476         return wxDragNone;
 477
 478     if (GtkGetMatchingPair() == (GdkAtom) 0)
 479         return wxDragNone;
 480
 481     return GetData() ? def : wxDragNone;
 482 }
 483
 484
 485 wxDataFormat wxDropTarget::GetMatchingPair()
 486 {
 487     return wxDataFormat( GtkGetMatchingPair() );
 488 }
 489
 490 GdkAtom wxDropTarget::GtkGetMatchingPair(bool quiet)
 491 {
 492     if (!m_dataObject)
 493         return (GdkAtom) 0;
 494
 495     if (!m_dragContext)
 496         return (GdkAtom) 0;
 497
 498     GList *child = m_dragContext->targets;
 499     while (child)
 500     {
 501         GdkAtom formatAtom = (GdkAtom)(child->data);
 502         wxDataFormat format( formatAtom );
 503
 504         if ( !quiet )
 505         {
 506             wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 507                        format.GetId().c_str());
 508         }
 509
 510         if (m_dataObject->IsSupportedFormat( format ))
 511             return formatAtom;
 512
 513         child = child->next;
 514     }
 515
 516     return (GdkAtom) 0;
 517 }
 518
 519 bool wxDropTarget::GetData()
 520 {
 521     if (!m_dragData)
 522         return false;
 523
 524     if (!m_dataObject)
 525         return false;
 526
 527     wxDataFormat dragFormat( m_dragData->target );
 528
 529     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 530         return false;
 531
 532     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 533
 534     return true;
 535 }
 536
 537 void wxDropTarget::GtkUnregisterWidget( GtkWidget *widget )
 538 {
 539     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 540
 541     gtk_drag_dest_unset( widget );
 542
 543     g_signal_handlers_disconnect_by_func (widget,
 544                                           (gpointer) target_drag_leave, this);
 545     g_signal_handlers_disconnect_by_func (widget,
 546                                           (gpointer) target_drag_motion, this);
 547     g_signal_handlers_disconnect_by_func (widget,
 548                                           (gpointer) target_drag_drop, this);
 549     g_signal_handlers_disconnect_by_func (widget,
 550                                           (gpointer) target_drag_data_received, this);
 551 }
 552
 553 void wxDropTarget::GtkRegisterWidget( GtkWidget *widget )
 554 {
 555     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 556
 557     /* gtk_drag_dest_set() determines what default behaviour we'd like
 558        GTK to supply. we don't want to specify out targets (=formats)
 559        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 560        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 561        "drag_motion" and "drag_drop" events. this makes it possible
 562        to allow dropping on only a small area. we should set
 563        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 564        highlighting if dragging over standard controls, but this
 565        seems to be broken without the other two. */
 566
 567     gtk_drag_dest_set( widget,
 568                        (GtkDestDefaults) 0,         /* no default behaviour */
 569                        NULL,      /* we don't supply any formats here */
 570                        0,                           /* number of targets = 0 */
 571                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 572
 573     g_signal_connect (widget, "drag_leave",
 574                       G_CALLBACK (target_drag_leave), this);
 575
 576     g_signal_connect (widget, "drag_motion",
 577                       G_CALLBACK (target_drag_motion), this);
 578
 579     g_signal_connect (widget, "drag_drop",
 580                       G_CALLBACK (target_drag_drop), this);
 581
 582     g_signal_connect (widget, "drag_data_received",
 583                       G_CALLBACK (target_drag_data_received), this);
 584 }
 585
 586 //----------------------------------------------------------------------------
 587 // "drag_data_get"
 588 //----------------------------------------------------------------------------
 589
 590 extern "C" {
 591 static void
 592 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 593                        GdkDragContext     *WXUNUSED(context),
 594                        GtkSelectionData   *selection_data,
 595                        guint               WXUNUSED(info),
 596                        guint               WXUNUSED(time),
 597                        wxDropSource       *drop_source )
 598 {
 599     wxDataFormat format( selection_data->target );
 600
 601     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 602                format.GetId().c_str());
 603
 604     drop_source->m_retValue = wxDragCancel;
 605
 606     wxDataObject *data = drop_source->GetDataObject();
 607
 608     if (!data)
 609     {
 610         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 611         return;
 612     }
 613
 614     if (!data->IsSupportedFormat(format))
 615     {
 616         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 617         return;
 618     }
 619
 620     if (data->GetDataSize(format) == 0)
 621     {
 622         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 623         return;
 624     }
 625
 626     size_t size = data->GetDataSize(format);
 627
 628 //  printf( "data size: %d.\n", (int)data_size );
 629
 630     guchar *d = new guchar[size];
 631
 632     if (!data->GetDataHere( format, (void*)d ))
 633     {
 634         delete[] d;
 635         return;
 636     }
 637
 638 #if wxUSE_THREADS
 639     /* disable GUI threads */
 640 #endif
 641
 642     gtk_selection_data_set( selection_data,
 643                             selection_data->target,
 644                             8,   // 8-bit
 645                             d,
 646                             size );
 647
 648 #if wxUSE_THREADS
 649     /* enable GUI threads */
 650 #endif
 651
 652     delete[] d;
 653 }
 654 }
 655
 656 //----------------------------------------------------------------------------
 657 // "drag_end"
 658 //----------------------------------------------------------------------------
 659
 660 extern "C" {
 661 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 662                              GdkDragContext     *WXUNUSED(context),
 663                              wxDropSource       *drop_source )
 664 {
 665     // printf( "Drag source: drag_end.\n" );
 666
 667     drop_source->m_waiting = false;
 668 }
 669 }
 670
 671 //-----------------------------------------------------------------------------
 672 // "configure_event" from m_iconWindow
 673 //-----------------------------------------------------------------------------
 674
 675 extern "C" {
 676 static gint
 677 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 678 {
 679     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 680
 681     return 0;
 682 }
 683 }
 684
 685 //---------------------------------------------------------------------------
 686 // wxDropSource
 687 //---------------------------------------------------------------------------
 688
 689 wxDropSource::wxDropSource(wxWindow *win,
 690                            const wxIcon &iconCopy,
 691                            const wxIcon &iconMove,
 692                            const wxIcon &iconNone)
 693 {
 694     m_waiting = true;
 695
 696     m_iconWindow = NULL;
 697
 698     m_window = win;
 699     m_widget = win->m_widget;
 700     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 701
 702     m_retValue = wxDragCancel;
 703
 704     SetIcons(iconCopy, iconMove, iconNone);
 705 }
 706
 707 wxDropSource::wxDropSource(wxDataObject& data,
 708                            wxWindow *win,
 709                            const wxIcon &iconCopy,
 710                            const wxIcon &iconMove,
 711                            const wxIcon &iconNone)
 712 {
 713     m_waiting = true;
 714
 715     SetData( data );
 716
 717     m_iconWindow = NULL;
 718
 719     m_window = win;
 720     m_widget = win->m_widget;
 721     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 722
 723     m_retValue = wxDragCancel;
 724
 725     SetIcons(iconCopy, iconMove, iconNone);
 726 }
 727
 728 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 729                             const wxIcon &iconMove,
 730                             const wxIcon &iconNone)
 731 {
 732     m_iconCopy = iconCopy;
 733     m_iconMove = iconMove;
 734     m_iconNone = iconNone;
 735
 736     if ( !m_iconCopy.Ok() )
 737         m_iconCopy = wxIcon(page_xpm);
 738     if ( !m_iconMove.Ok() )
 739         m_iconMove = m_iconCopy;
 740     if ( !m_iconNone.Ok() )
 741         m_iconNone = m_iconCopy;
 742 }
 743
 744 wxDropSource::~wxDropSource()
 745 {
 746 }
 747
 748 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 749 {
 750     // get the right icon to display
 751     wxIcon *icon = NULL;
 752     if ( action & GDK_ACTION_MOVE )
 753         icon = &m_iconMove;
 754     else if ( action & GDK_ACTION_COPY )
 755         icon = &m_iconCopy;
 756     else
 757         icon = &m_iconNone;
 758
 759     GdkBitmap *mask;
 760     if ( icon->GetMask() )
 761         mask = icon->GetMask()->GetBitmap();
 762     else
 763         mask = NULL;
 764
 765     GdkPixmap *pixmap = icon->GetPixmap();
 766
 767     gint width,height;
 768     gdk_drawable_get_size (pixmap, &width, &height);
 769
 770     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 771     gtk_widget_push_colormap (colormap);
 772
 773     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 774     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 775     gtk_widget_set_app_paintable (m_iconWindow, TRUE);
 776
 777     gtk_widget_pop_colormap ();
 778
 779     gtk_widget_set_size_request (m_iconWindow, width, height);
 780     gtk_widget_realize (m_iconWindow);
 781
 782     g_signal_connect (m_iconWindow, "configure_event",
 783                       G_CALLBACK (gtk_dnd_window_configure_callback), this);
 784
 785     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 786
 787     if (mask)
 788         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 789
 790     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 791 }
 792
 793 wxDragResult wxDropSource::DoDragDrop(int flags)
 794 {
 795     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 796                  wxT("Drop source: no data") );
 797
 798     // still in drag
 799     if (g_blockEventsOnDrag)
 800         return wxDragNone;
 801
 802     // don't start dragging if no button is down
 803     if (g_lastButtonNumber == 0)
 804         return wxDragNone;
 805
 806     // we can only start a drag after a mouse event
 807     if (g_lastMouseEvent == NULL)
 808         return wxDragNone;
 809
 810     GTKConnectDragSignals();
 811     wxON_BLOCK_EXIT_OBJ0(*this, wxDropSource::GTKDisconnectDragSignals);
 812
 813     m_waiting = true;
 814
 815     GtkTargetList *target_list = gtk_target_list_new( NULL, 0 );
 816
 817     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 818     m_data->GetAllFormats( array );
 819     size_t count = m_data->GetFormatCount();
 820     for (size_t i = 0; i < count; i++)
 821     {
 822         GdkAtom atom = array[i];
 823         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"),
 824                    gdk_atom_name( atom ));
 825         gtk_target_list_add( target_list, atom, 0, 0 );
 826     }
 827     delete[] array;
 828
 829     int action = GDK_ACTION_COPY;
 830     if ( flags & wxDrag_AllowMove )
 831         action |= GDK_ACTION_MOVE;
 832
 833     // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 834     //     to use a global to pass the flags to the drop target but I'd
 835     //     surely prefer a better way to do it
 836     gs_flagsForDrag = flags;
 837
 838     GdkDragContext *context = gtk_drag_begin( m_widget,
 839                 target_list,
 840                 (GdkDragAction)action,
 841                 g_lastButtonNumber,  // number of mouse button which started drag
 842                 (GdkEvent*) g_lastMouseEvent );
 843
 844     if ( !context )
 845     {
 846         // this can happen e.g. if gdk_pointer_grab() failed
 847         return wxDragError;
 848     }
 849
 850     m_dragContext = context;
 851
 852     PrepareIcon( action, context );
 853
 854     while (m_waiting)
 855         gtk_main_iteration();
 856
 857     m_retValue = ConvertFromGTK(context->action);
 858     if ( m_retValue == wxDragNone )
 859          m_retValue = wxDragCancel;
 860
 861     return m_retValue;
 862 }
 863
 864 void wxDropSource::GTKConnectDragSignals()
 865 {
 866     if (!m_widget)
 867         return;
 868
 869     g_blockEventsOnDrag = true;
 870
 871     g_signal_connect (m_widget, "drag_data_get",
 872                       G_CALLBACK (source_drag_data_get), this);
 873     g_signal_connect (m_widget, "drag_end",
 874                       G_CALLBACK (source_drag_end), this);
 875
 876 }
 877
 878 void wxDropSource::GTKDisconnectDragSignals()
 879 {
 880     if (!m_widget)
 881         return;
 882
 883     g_blockEventsOnDrag = false;
 884
 885     g_signal_handlers_disconnect_by_func (m_widget,
 886                                           (gpointer) source_drag_data_get,
 887                                           this);
 888     g_signal_handlers_disconnect_by_func (m_widget,
 889                                           (gpointer) source_drag_end,
 890                                           this);
 891 }
 892
 893 #endif
 894       // wxUSE_DRAG_AND_DROP