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 <gtk/gtk.h>
  27
  28 //----------------------------------------------------------------------------
  29 // global data
  30 //----------------------------------------------------------------------------
  31
  32 extern bool g_blockEventsOnDrag;
  33
  34 // the flags used for the last DoDragDrop()
  35 static long gs_flagsForDrag = 0;
  36
  37 #ifdef __WXDEBUG__
  38 // the trace mask we use with wxLogTrace() - call
  39 // wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
  40 // (there are quite a few of them, so don't enable this by default)
  41 static const wxChar *TRACE_DND = _T("dnd");
  42 #endif
  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->SetDragContext( 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->SetDragContext( (GdkDragContext*) 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     /* inform the wxDropTarget about the current GdkDragContext.
 198        this is only valid for the duration of this call */
 199     drop_target->SetDragContext( context );
 200
 201     // GTK+ always supposes that we want to copy the data by default while we
 202     // might want to move it, so examine not only suggested_action - which is
 203     // only good if we don't have our own preferences - but also the actions
 204     // field
 205     wxDragResult result;
 206     if (drop_target->GetDefaultAction() == wxDragNone)
 207     {
 208         // use default action set by wxDropSource::DoDragDrop()
 209     if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 210             (context->actions & GDK_ACTION_MOVE ) )
 211     {
 212         // move is requested by the program and allowed by GTK+ - do it, even
 213         // though suggested_action may be currently wxDragCopy
 214         result = wxDragMove;
 215     }
 216     else // use whatever GTK+ says we should
 217     {
 218         result = ConvertFromGTK(context->suggested_action);
 219
 220         if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 221         {
 222             // we're requested to move but we can't
 223             result = wxDragCopy;
 224         }
 225     }
 226     }
 227     else if (drop_target->GetDefaultAction() == wxDragMove &&
 228                 (context->actions & GDK_ACTION_MOVE))
 229     {
 230        result = wxDragMove;
 231     }
 232     else
 233     {
 234         if (context->actions & GDK_ACTION_COPY)
 235             result = wxDragCopy;
 236         else if (context->actions & GDK_ACTION_MOVE)
 237             result = wxDragMove;
 238         else
 239             result = wxDragNone;
 240     }
 241
 242     if (drop_target->m_firstMotion)
 243     {
 244         /* the first "drag_motion" event substitutes a "drag_enter" event */
 245         result = drop_target->OnEnter( x, y, result );
 246     }
 247     else
 248     {
 249         /* give program a chance to react (i.e. to say no by returning FALSE) */
 250         result = drop_target->OnDragOver( x, y, result );
 251     }
 252
 253     bool ret = wxIsDragResultOk( result );
 254     if (ret)
 255     {
 256         GdkDragAction action;
 257         if (result == wxDragCopy)
 258             action = GDK_ACTION_COPY;
 259         else if (result == wxDragLink)
 260             action = GDK_ACTION_LINK;
 261         else
 262             action = GDK_ACTION_MOVE;
 263
 264         gdk_drag_status( context, action, time );
 265     }
 266
 267     /* after this, invalidate the drop_target's GdkDragContext */
 268     drop_target->SetDragContext( (GdkDragContext*) NULL );
 269
 270     /* this has to be done because GDK has no "drag_enter" event */
 271     drop_target->m_firstMotion = false;
 272
 273     return ret;
 274 }
 275 }
 276
 277 // ----------------------------------------------------------------------------
 278 // "drag_drop"
 279 // ----------------------------------------------------------------------------
 280
 281 extern "C" {
 282 static gboolean target_drag_drop( GtkWidget *widget,
 283                                   GdkDragContext *context,
 284                                   gint x,
 285                                   gint y,
 286                                   guint time,
 287                                   wxDropTarget *drop_target )
 288 {
 289     /* Owen Taylor: "if the drop is not in a drop zone,
 290        return FALSE, otherwise, if you aren't accepting
 291        the drop, call gtk_drag_finish() with success == FALSE
 292        otherwise call gtk_drag_data_get()" */
 293
 294 //    printf( "drop.\n" );
 295
 296     /* this seems to make a difference between not accepting
 297        due to wrong target area and due to wrong format. let
 298        us hope that this is not required.. */
 299
 300     /* inform the wxDropTarget about the current GdkDragContext.
 301        this is only valid for the duration of this call */
 302     drop_target->SetDragContext( context );
 303
 304     /* inform the wxDropTarget about the current drag widget.
 305        this is only valid for the duration of this call */
 306     drop_target->SetDragWidget( widget );
 307
 308     /* inform the wxDropTarget about the current drag time.
 309        this is only valid for the duration of this call */
 310     drop_target->SetDragTime( time );
 311
 312 /*
 313     wxDragResult result = wxDragMove;
 314     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 315 */
 316
 317     /* reset the block here as someone might very well
 318        show a dialog as a reaction to a drop and this
 319        wouldn't work without events */
 320     g_blockEventsOnDrag = false;
 321
 322     bool ret = drop_target->OnDrop( x, y );
 323
 324     if (!ret)
 325     {
 326 #ifdef __WXDEBUG__
 327         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 328 #endif
 329
 330         /* cancel the whole thing */
 331         gtk_drag_finish( context,
 332                           FALSE,        /* no success */
 333                           FALSE,        /* don't delete data on dropping side */
 334                           time );
 335     }
 336     else
 337     {
 338 #ifdef __WXDEBUG__
 339         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned true") );
 340 #endif
 341
 342 #if wxUSE_THREADS
 343         /* disable GUI threads */
 344 #endif
 345
 346         GdkAtom format = drop_target->GetMatchingPair();
 347
 348         // this does happen somehow, see bug 555111
 349         wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") );
 350
 351 /*
 352         GdkDragAction action = GDK_ACTION_MOVE;
 353         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 354         context->action = action;
 355 */
 356         /* this should trigger an "drag_data_received" event */
 357         gtk_drag_get_data( widget,
 358                            context,
 359                            format,
 360                            time );
 361
 362 #if wxUSE_THREADS
 363         /* re-enable GUI threads */
 364 #endif
 365     }
 366
 367     /* after this, invalidate the drop_target's GdkDragContext */
 368     drop_target->SetDragContext( (GdkDragContext*) NULL );
 369
 370     /* after this, invalidate the drop_target's drag widget */
 371     drop_target->SetDragWidget( (GtkWidget*) NULL );
 372
 373     /* this has to be done because GDK has no "drag_enter" event */
 374     drop_target->m_firstMotion = true;
 375
 376     return ret;
 377 }
 378 }
 379
 380 // ----------------------------------------------------------------------------
 381 // "drag_data_received"
 382 // ----------------------------------------------------------------------------
 383
 384 extern "C" {
 385 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 386                                        GdkDragContext *context,
 387                                        gint x,
 388                                        gint y,
 389                                        GtkSelectionData *data,
 390                                        guint WXUNUSED(info),
 391                                        guint time,
 392                                        wxDropTarget *drop_target )
 393 {
 394     /* Owen Taylor: "call gtk_drag_finish() with
 395        success == TRUE" */
 396
 397     if ((data->length <= 0) || (data->format != 8))
 398     {
 399         /* negative data length and non 8-bit data format
 400            qualifies for junk */
 401         gtk_drag_finish (context, FALSE, FALSE, time);
 402
 403         return;
 404     }
 405
 406 #ifdef __WXDEBUG__
 407     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 408 #endif
 409
 410     /* inform the wxDropTarget about the current GtkSelectionData.
 411        this is only valid for the duration of this call */
 412     drop_target->SetDragData( data );
 413
 414     wxDragResult result = ConvertFromGTK(context->action);
 415
 416     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 417     {
 418 #ifdef __WXDEBUG__
 419         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned true") );
 420 #endif
 421
 422         /* tell GTK that data transfer was successful */
 423         gtk_drag_finish( context, TRUE, FALSE, time );
 424     }
 425     else
 426     {
 427 #ifdef __WXDEBUG__
 428         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 429 #endif
 430
 431         /* tell GTK that data transfer was not successful */
 432         gtk_drag_finish( context, FALSE, FALSE, time );
 433     }
 434
 435     /* after this, invalidate the drop_target's drag data */
 436     drop_target->SetDragData( (GtkSelectionData*) NULL );
 437 }
 438 }
 439
 440 //----------------------------------------------------------------------------
 441 // wxDropTarget
 442 //----------------------------------------------------------------------------
 443
 444 wxDropTarget::wxDropTarget( wxDataObject *data )
 445             : wxDropTargetBase( data )
 446 {
 447     m_firstMotion = true;
 448     m_dragContext = (GdkDragContext*) NULL;
 449     m_dragWidget = (GtkWidget*) NULL;
 450     m_dragData = (GtkSelectionData*) NULL;
 451     m_dragTime = 0;
 452 }
 453
 454 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 455                                        wxCoord WXUNUSED(y),
 456                                        wxDragResult def )
 457 {
 458     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 459
 460     // disable the debug message from GetMatchingPair() - there are too many
 461     // of them otherwise
 462 #ifdef __WXDEBUG__
 463     wxLogNull noLog;
 464 #endif // Debug
 465
 466     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 467 }
 468
 469 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 470 {
 471     if (!m_dataObject)
 472         return false;
 473
 474     return (GetMatchingPair() != (GdkAtom) 0);
 475 }
 476
 477 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 478                                    wxDragResult def )
 479 {
 480     if (!m_dataObject)
 481         return wxDragNone;
 482
 483     if (GetMatchingPair() == (GdkAtom) 0)
 484         return wxDragNone;
 485
 486     return GetData() ? def : wxDragNone;
 487 }
 488
 489 GdkAtom wxDropTarget::GetMatchingPair()
 490 {
 491     if (!m_dataObject)
 492         return (GdkAtom) 0;
 493
 494     if (!m_dragContext)
 495         return (GdkAtom) 0;
 496
 497     GList *child = m_dragContext->targets;
 498     while (child)
 499     {
 500         GdkAtom formatAtom = (GdkAtom)(child->data);
 501         wxDataFormat format( formatAtom );
 502
 503 #ifdef __WXDEBUG__
 504         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 505                    format.GetId().c_str());
 506 #endif // Debug
 507
 508         if (m_dataObject->IsSupportedFormat( format ))
 509             return formatAtom;
 510
 511         child = child->next;
 512     }
 513
 514     return (GdkAtom) 0;
 515 }
 516
 517 bool wxDropTarget::GetData()
 518 {
 519     if (!m_dragData)
 520         return false;
 521
 522     if (!m_dataObject)
 523         return false;
 524
 525     wxDataFormat dragFormat( m_dragData->target );
 526
 527     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 528         return false;
 529
 530     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 531
 532     return true;
 533 }
 534
 535 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 536 {
 537     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 538
 539     gtk_drag_dest_unset( widget );
 540
 541     g_signal_handlers_disconnect_by_func (widget,
 542                                           (gpointer) target_drag_leave, this);
 543     g_signal_handlers_disconnect_by_func (widget,
 544                                           (gpointer) target_drag_motion, this);
 545     g_signal_handlers_disconnect_by_func (widget,
 546                                           (gpointer) target_drag_drop, this);
 547     g_signal_handlers_disconnect_by_func (widget,
 548                                           (gpointer) target_drag_data_received, this);
 549 }
 550
 551 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 552 {
 553     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 554
 555     /* gtk_drag_dest_set() determines what default behaviour we'd like
 556        GTK to supply. we don't want to specify out targets (=formats)
 557        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 558        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 559        "drag_motion" and "drag_drop" events. this makes it possible
 560        to allow dropping on only a small area. we should set
 561        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 562        highlighting if dragging over standard controls, but this
 563        seems to be broken without the other two. */
 564
 565     gtk_drag_dest_set( widget,
 566                        (GtkDestDefaults) 0,         /* no default behaviour */
 567                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 568                        0,                           /* number of targets = 0 */
 569                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 570
 571     g_signal_connect (widget, "drag_leave",
 572                       G_CALLBACK (target_drag_leave), this);
 573
 574     g_signal_connect (widget, "drag_motion",
 575                       G_CALLBACK (target_drag_motion), this);
 576
 577     g_signal_connect (widget, "drag_drop",
 578                       G_CALLBACK (target_drag_drop), this);
 579
 580     g_signal_connect (widget, "drag_data_received",
 581                       G_CALLBACK (target_drag_data_received), this);
 582 }
 583
 584 //----------------------------------------------------------------------------
 585 // "drag_data_get"
 586 //----------------------------------------------------------------------------
 587
 588 extern "C" {
 589 static void
 590 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 591                        GdkDragContext     *WXUNUSED(context),
 592                        GtkSelectionData   *selection_data,
 593                        guint               WXUNUSED(info),
 594                        guint               WXUNUSED(time),
 595                        wxDropSource       *drop_source )
 596 {
 597     wxDataFormat format( selection_data->target );
 598
 599 #ifdef __WXDEBUG__
 600     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 601                format.GetId().c_str());
 602 #endif
 603
 604     drop_source->m_retValue = wxDragCancel;
 605
 606     wxDataObject *data = drop_source->GetDataObject();
 607
 608     if (!data)
 609     {
 610 #ifdef __WXDEBUG__
 611         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 612 #endif
 613        return;
 614     }
 615
 616     if (!data->IsSupportedFormat(format))
 617     {
 618 #ifdef __WXDEBUG__
 619         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 620 #endif
 621        return;
 622     }
 623
 624     if (data->GetDataSize(format) == 0)
 625     {
 626 #ifdef __WXDEBUG__
 627         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 628 #endif
 629        return;
 630     }
 631
 632     size_t size = data->GetDataSize(format);
 633
 634 //  printf( "data size: %d.\n", (int)data_size );
 635
 636     guchar *d = new guchar[size];
 637
 638     if (!data->GetDataHere( format, (void*)d ))
 639     {
 640         delete[] d;
 641         return;
 642     }
 643
 644 #if wxUSE_THREADS
 645     /* disable GUI threads */
 646 #endif
 647
 648     gtk_selection_data_set( selection_data,
 649                             selection_data->target,
 650                             8,   // 8-bit
 651                             d,
 652                             size );
 653
 654 #if wxUSE_THREADS
 655     /* enable GUI threads */
 656 #endif
 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     // printf( "Drag source: drag_end.\n" );
 672
 673     drop_source->m_waiting = false;
 674 }
 675 }
 676
 677 //-----------------------------------------------------------------------------
 678 // "configure_event" from m_iconWindow
 679 //-----------------------------------------------------------------------------
 680
 681 extern "C" {
 682 static gint
 683 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 684 {
 685     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 686
 687     return 0;
 688 }
 689 }
 690
 691 //---------------------------------------------------------------------------
 692 // wxDropSource
 693 //---------------------------------------------------------------------------
 694
 695 wxDropSource::wxDropSource(wxWindow *win,
 696                            const wxIcon &iconCopy,
 697                            const wxIcon &iconMove,
 698                            const wxIcon &iconNone)
 699 {
 700     m_waiting = true;
 701
 702     m_iconWindow = (GtkWidget*) NULL;
 703
 704     m_window = win;
 705     m_widget = win->m_widget;
 706     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 707
 708     m_retValue = wxDragCancel;
 709
 710     SetIcons(iconCopy, iconMove, iconNone);
 711 }
 712
 713 wxDropSource::wxDropSource(wxDataObject& data,
 714                            wxWindow *win,
 715                            const wxIcon &iconCopy,
 716                            const wxIcon &iconMove,
 717                            const wxIcon &iconNone)
 718 {
 719     m_waiting = true;
 720
 721     SetData( data );
 722
 723     m_iconWindow = (GtkWidget*) NULL;
 724
 725     m_window = win;
 726     m_widget = win->m_widget;
 727     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 728
 729     m_retValue = wxDragCancel;
 730
 731     SetIcons(iconCopy, iconMove, iconNone);
 732 }
 733
 734 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 735                             const wxIcon &iconMove,
 736                             const wxIcon &iconNone)
 737 {
 738     m_iconCopy = iconCopy;
 739     m_iconMove = iconMove;
 740     m_iconNone = iconNone;
 741
 742     if ( !m_iconCopy.Ok() )
 743         m_iconCopy = wxIcon(page_xpm);
 744     if ( !m_iconMove.Ok() )
 745         m_iconMove = m_iconCopy;
 746     if ( !m_iconNone.Ok() )
 747         m_iconNone = m_iconCopy;
 748 }
 749
 750 wxDropSource::~wxDropSource()
 751 {
 752 }
 753
 754 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 755 {
 756     // get the right icon to display
 757     wxIcon *icon = NULL;
 758     if ( action & GDK_ACTION_MOVE )
 759         icon = &m_iconMove;
 760     else if ( action & GDK_ACTION_COPY )
 761         icon = &m_iconCopy;
 762     else
 763         icon = &m_iconNone;
 764
 765     GdkBitmap *mask;
 766     if ( icon->GetMask() )
 767         mask = icon->GetMask()->GetBitmap();
 768     else
 769         mask = (GdkBitmap *)NULL;
 770
 771     GdkPixmap *pixmap = icon->GetPixmap();
 772
 773     gint width,height;
 774     gdk_drawable_get_size (pixmap, &width, &height);
 775
 776     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 777     gtk_widget_push_colormap (colormap);
 778
 779     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 780     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 781     gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
 782
 783     gtk_widget_pop_colormap ();
 784
 785     gtk_widget_set_size_request (m_iconWindow, width, height);
 786     gtk_widget_realize (m_iconWindow);
 787
 788     g_signal_connect (m_iconWindow, "configure_event",
 789                       G_CALLBACK (gtk_dnd_window_configure_callback), this);
 790
 791     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 792
 793     if (mask)
 794         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 795
 796     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 797 }
 798
 799 wxDragResult wxDropSource::DoDragDrop(int flags)
 800 {
 801     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 802                  wxT("Drop source: no data") );
 803
 804     // still in drag
 805     if (g_blockEventsOnDrag)
 806         return wxDragNone;
 807
 808     // don't start dragging if no button is down
 809     if (g_lastButtonNumber == 0)
 810         return wxDragNone;
 811
 812     // we can only start a drag after a mouse event
 813     if (g_lastMouseEvent == NULL)
 814         return wxDragNone;
 815
 816     // disabled for now
 817     g_blockEventsOnDrag = true;
 818
 819     RegisterWindow();
 820
 821     m_waiting = true;
 822
 823     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 824
 825     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 826     m_data->GetAllFormats( array );
 827     size_t count = m_data->GetFormatCount();
 828     for (size_t i = 0; i < count; i++)
 829     {
 830         GdkAtom atom = array[i];
 831 #ifdef __WXDEBUG__
 832         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 833 #endif
 834        gtk_target_list_add( target_list, atom, 0, 0 );
 835     }
 836     delete[] array;
 837
 838     int action = GDK_ACTION_COPY;
 839     if ( flags & wxDrag_AllowMove )
 840         action |= GDK_ACTION_MOVE;
 841
 842     // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 843     //     to use a global to pass the flags to the drop target but I'd
 844     //     surely prefer a better way to do it
 845     gs_flagsForDrag = flags;
 846
 847     GdkDragContext *context = gtk_drag_begin( m_widget,
 848                 target_list,
 849                 (GdkDragAction)action,
 850                 g_lastButtonNumber,  // number of mouse button which started drag
 851                 (GdkEvent*) g_lastMouseEvent );
 852
 853     m_dragContext = context;
 854
 855     PrepareIcon( action, context );
 856
 857     while (m_waiting)
 858         gtk_main_iteration();
 859
 860     m_retValue = ConvertFromGTK(context->action);
 861     if ( m_retValue == wxDragNone )
 862          m_retValue = wxDragCancel;
 863
 864     g_blockEventsOnDrag = false;
 865
 866     UnregisterWindow();
 867
 868     return m_retValue;
 869 }
 870
 871 void wxDropSource::RegisterWindow()
 872 {
 873     if (!m_widget) return;
 874
 875     g_signal_connect (m_widget, "drag_data_get",
 876                       G_CALLBACK (source_drag_data_get), this);
 877     g_signal_connect (m_widget, "drag_end",
 878                       G_CALLBACK (source_drag_end), this);
 879
 880 }
 881
 882 void wxDropSource::UnregisterWindow()
 883 {
 884     if (!m_widget)
 885         return;
 886
 887     g_signal_handlers_disconnect_by_func (m_widget,
 888                                           (gpointer) source_drag_data_get,
 889                                           this);
 890     g_signal_handlers_disconnect_by_func (m_widget,
 891                                           (gpointer) source_drag_end,
 892                                           this);
 893 }
 894
 895 #endif
 896       // wxUSE_DRAG_AND_DROP