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 #include "wx/gtk/private/gtk2-compat.h"
  30
  31 //----------------------------------------------------------------------------
  32 // global data
  33 //----------------------------------------------------------------------------
  34
  35 extern bool g_blockEventsOnDrag;
  36
  37 // the flags used for the last DoDragDrop()
  38 static 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
  47 extern GdkEvent *g_lastMouseEvent;
  48 extern int       g_lastButtonNumber;
  49
  50 //----------------------------------------------------------------------------
  51 // standard icons
  52 //----------------------------------------------------------------------------
  53
  54 /* Copyright (c) Julian Smart */
  55 static 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
 139 static 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
 160 extern "C" {
 161 static 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
 186 extern "C" {
 187 static 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
 263 extern "C" {
 264 static 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
 354 extern "C" {
 355 static 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
 408 wxDropTarget::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
 418 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 419                                        wxCoord WXUNUSED(y),
 420                                        wxDragResult def )
 421 {
 422     return def;
 423 }
 424
 425 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 426 {
 427     return true;
 428 }
 429
 430 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 431                                    wxDragResult def )
 432 {
 433     return GetData() ? def : wxDragNone;
 434 }
 435
 436 wxDragResult 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
 495 wxDataFormat wxDropTarget::GetMatchingPair()
 496 {
 497     return wxDataFormat( GTKGetMatchingPair() );
 498 }
 499
 500 GdkAtom 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
 529 bool 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
 549 void 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
 565 void 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
 602 extern "C" {
 603 static void
 604 source_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
 666 extern "C" {
 667 static 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
 679 extern "C" {
 680 static gint
 681 gtk_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
 693 wxDropSource::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
 711 wxDropSource::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
 732 void 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
 748 wxDropSource::~wxDropSource()
 749 {
 750 }
 751
 752 void 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
 797 wxDragResult 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
 869 void 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
 883 void 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