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/gtk/private.h"
  27
  28 #include <gdk/gdkprivate.h>
  29
  30 #include <gtk/gtkdnd.h>
  31 #include <gtk/gtkselection.h>
  32
  33 //----------------------------------------------------------------------------
  34 // global data
  35 //----------------------------------------------------------------------------
  36
  37 extern bool g_blockEventsOnDrag;
  38
  39 // the flags used for the last DoDragDrop()
  40 static long gs_flagsForDrag = 0;
  41
  42 #ifdef __WXDEBUG__
  43 // the trace mask we use with wxLogTrace() - call
  44 // wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
  45 // (there are quite a few of them, so don't enable this by default)
  46 static const wxChar *TRACE_DND = _T("dnd");
  47 #endif
  48
  49 // global variables because GTK+ DnD want to have the
  50 // mouse event that caused it
  51 extern GdkEvent *g_lastMouseEvent;
  52 extern int       g_lastButtonNumber;
  53
  54 //----------------------------------------------------------------------------
  55 // standard icons
  56 //----------------------------------------------------------------------------
  57
  58 /* Copyright (c) Julian Smart */
  59 static const char * page_xpm[] = {
  60 /* columns rows colors chars-per-pixel */
  61 "32 32 37 1",
  62 "5 c #7198D9",
  63 ", c #769CDA",
  64 "2 c #DCE6F6",
  65 "i c #FFFFFF",
  66 "e c #779DDB",
  67 ": c #9AB6E4",
  68 "9 c #EAF0FA",
  69 "- c #B1C7EB",
  70 "$ c #6992D7",
  71 "y c #F7F9FD",
  72 "= c #BED0EE",
  73 "q c #F0F5FC",
  74 "; c #A8C0E8",
  75 "@ c #366BC2",
  76 "  c None",
  77 "u c #FDFEFF",
  78 "8 c #5987D3",
  79 "* c #C4D5F0",
  80 "7 c #7CA0DC",
  81 "O c #487BCE",
  82 "< c #6B94D7",
  83 "& c #CCDAF2",
  84 "> c #89A9DF",
  85 "3 c #5584D1",
  86 "w c #82A5DE",
  87 "1 c #3F74CB",
  88 "+ c #3A70CA",
  89 ". c #3569BF",
  90 "% c #D2DFF4",
  91 "# c #3366BB",
  92 "r c #F5F8FD",
  93 "0 c #FAFCFE",
  94 "4 c #DFE8F7",
  95 "X c #5E8AD4",
  96 "o c #5282D0",
  97 "t c #B8CCEC",
  98 "6 c #E5EDF9",
  99 /* pixels */
 100 "                                ",
 101 "                                ",
 102 "                                ",
 103 "                                ",
 104 "                                ",
 105 "       .XXXooOO++@#             ",
 106 "       $%&*=-;::>,<1            ",
 107 "       $2%&*=-;::><:3           ",
 108 "       $42%&*=-;::<&:3          ",
 109 "       56477<<<<8<<9&:X         ",
 110 "       59642%&*=-;<09&:5        ",
 111 "       5q9642%&*=-<<<<<#        ",
 112 "       5qqw777<<<<<88:>+        ",
 113 "       erqq9642%&*=t;::+        ",
 114 "       eyrqq9642%&*=t;:O        ",
 115 "       eyywwww777<<<<t;O        ",
 116 "       e0yyrqq9642%&*=to        ",
 117 "       e00yyrqq9642%&*=o        ",
 118 "       eu0wwwwwww777<&*X        ",
 119 "       euu00yyrqq9642%&X        ",
 120 "       eiuu00yyrqq9642%X        ",
 121 "       eiiwwwwwwwwww742$        ",
 122 "       eiiiuu00yyrqq964$        ",
 123 "       eiiiiuu00yyrqq96$        ",
 124 "       eiiiiiuu00yyrqq95        ",
 125 "       eiiiiiiuu00yyrqq5        ",
 126 "       eeeeeeeeeeeeee55e        ",
 127 "                                ",
 128 "                                ",
 129 "                                ",
 130 "                                ",
 131 "                                "
 132 };
 133
 134
 135 // ============================================================================
 136 // private functions
 137 // ============================================================================
 138
 139 // ----------------------------------------------------------------------------
 140 // convert between GTK+ and wxWidgets DND constants
 141 // ----------------------------------------------------------------------------
 142
 143 static wxDragResult ConvertFromGTK(long action)
 144 {
 145     switch ( action )
 146     {
 147         case GDK_ACTION_COPY:
 148             return wxDragCopy;
 149
 150         case GDK_ACTION_LINK:
 151             return wxDragLink;
 152
 153         case GDK_ACTION_MOVE:
 154             return wxDragMove;
 155     }
 156
 157     return wxDragNone;
 158 }
 159
 160 // ----------------------------------------------------------------------------
 161 // "drag_leave"
 162 // ----------------------------------------------------------------------------
 163
 164 extern "C" {
 165 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 166                                GdkDragContext *context,
 167                                guint WXUNUSED(time),
 168                                wxDropTarget *drop_target )
 169 {
 170     if (g_isIdle) wxapp_install_idle_handler();
 171
 172     /* inform the wxDropTarget about the current GdkDragContext.
 173        this is only valid for the duration of this call */
 174     drop_target->SetDragContext( context );
 175
 176     /* we don't need return values. this event is just for
 177        information */
 178     drop_target->OnLeave();
 179
 180     /* this has to be done because GDK has no "drag_enter" event */
 181     drop_target->m_firstMotion = true;
 182
 183     /* after this, invalidate the drop_target's GdkDragContext */
 184     drop_target->SetDragContext( (GdkDragContext*) NULL );
 185 }
 186 }
 187
 188 // ----------------------------------------------------------------------------
 189 // "drag_motion"
 190 // ----------------------------------------------------------------------------
 191
 192 extern "C" {
 193 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 194                                     GdkDragContext *context,
 195                                     gint x,
 196                                     gint y,
 197                                     guint time,
 198                                     wxDropTarget *drop_target )
 199 {
 200     if (g_isIdle) wxapp_install_idle_handler();
 201
 202     /* Owen Taylor: "if the coordinates not in a drop zone,
 203        return FALSE, otherwise call gtk_drag_status() and
 204        return TRUE" */
 205
 206     /* inform the wxDropTarget about the current GdkDragContext.
 207        this is only valid for the duration of this call */
 208     drop_target->SetDragContext( context );
 209
 210     // GTK+ always supposes that we want to copy the data by default while we
 211     // might want to move it, so examine not only suggested_action - which is
 212     // only good if we don't have our own preferences - but also the actions
 213     // field
 214     wxDragResult result;
 215     if (drop_target->GetDefaultAction() == wxDragNone)
 216     {
 217         // use default action set by wxDropSource::DoDragDrop()
 218     if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 219             (context->actions & GDK_ACTION_MOVE ) )
 220     {
 221         // move is requested by the program and allowed by GTK+ - do it, even
 222         // though suggested_action may be currently wxDragCopy
 223         result = wxDragMove;
 224     }
 225     else // use whatever GTK+ says we should
 226     {
 227         result = ConvertFromGTK(context->suggested_action);
 228
 229         if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 230         {
 231             // we're requested to move but we can't
 232             result = wxDragCopy;
 233         }
 234     }
 235     }
 236     else if (drop_target->GetDefaultAction() == wxDragMove &&
 237                 (context->actions & GDK_ACTION_MOVE))
 238     {
 239        result = wxDragMove;
 240     }
 241     else
 242     {
 243         if (context->actions & GDK_ACTION_COPY)
 244             result = wxDragCopy;
 245         else if (context->actions & GDK_ACTION_MOVE)
 246             result = wxDragMove;
 247         else
 248             result = wxDragNone;
 249     }
 250
 251     if (drop_target->m_firstMotion)
 252     {
 253         /* the first "drag_motion" event substitutes a "drag_enter" event */
 254         result = drop_target->OnEnter( x, y, result );
 255     }
 256     else
 257     {
 258         /* give program a chance to react (i.e. to say no by returning FALSE) */
 259         result = drop_target->OnDragOver( x, y, result );
 260     }
 261
 262     bool ret = wxIsDragResultOk( result );
 263     if (ret)
 264     {
 265         GdkDragAction action;
 266         if (result == wxDragCopy)
 267             action = GDK_ACTION_COPY;
 268         else if (result == wxDragLink)
 269             action = GDK_ACTION_LINK;
 270         else
 271             action = GDK_ACTION_MOVE;
 272
 273         gdk_drag_status( context, action, time );
 274     }
 275
 276     /* after this, invalidate the drop_target's GdkDragContext */
 277     drop_target->SetDragContext( (GdkDragContext*) NULL );
 278
 279     /* this has to be done because GDK has no "drag_enter" event */
 280     drop_target->m_firstMotion = false;
 281
 282     return ret;
 283 }
 284 }
 285
 286 // ----------------------------------------------------------------------------
 287 // "drag_drop"
 288 // ----------------------------------------------------------------------------
 289
 290 extern "C" {
 291 static gboolean target_drag_drop( GtkWidget *widget,
 292                                   GdkDragContext *context,
 293                                   gint x,
 294                                   gint y,
 295                                   guint time,
 296                                   wxDropTarget *drop_target )
 297 {
 298     if (g_isIdle) wxapp_install_idle_handler();
 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 //    printf( "drop.\n" );
 306
 307     /* this seems to make a difference between not accepting
 308        due to wrong target area and due to wrong format. let
 309        us hope that this is not required.. */
 310
 311     /* inform the wxDropTarget about the current GdkDragContext.
 312        this is only valid for the duration of this call */
 313     drop_target->SetDragContext( context );
 314
 315     /* inform the wxDropTarget about the current drag widget.
 316        this is only valid for the duration of this call */
 317     drop_target->SetDragWidget( widget );
 318
 319     /* inform the wxDropTarget about the current drag time.
 320        this is only valid for the duration of this call */
 321     drop_target->SetDragTime( time );
 322
 323 /*
 324     wxDragResult result = wxDragMove;
 325     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 326 */
 327
 328     /* reset the block here as someone might very well
 329        show a dialog as a reaction to a drop and this
 330        wouldn't work without events */
 331     g_blockEventsOnDrag = false;
 332
 333     bool ret = drop_target->OnDrop( x, y );
 334
 335     if (!ret)
 336     {
 337 #ifdef __WXDEBUG__
 338         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 339 #endif
 340
 341         /* cancel the whole thing */
 342         gtk_drag_finish( context,
 343                           FALSE,        /* no success */
 344                           FALSE,        /* don't delete data on dropping side */
 345                           time );
 346     }
 347     else
 348     {
 349 #ifdef __WXDEBUG__
 350         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned true") );
 351 #endif
 352
 353 #if wxUSE_THREADS
 354         /* disable GUI threads */
 355 #endif
 356
 357         GdkAtom format = drop_target->GetMatchingPair();
 358
 359         // this does happen somehow, see bug 555111
 360         wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") );
 361
 362 /*
 363         GdkDragAction action = GDK_ACTION_MOVE;
 364         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 365         context->action = action;
 366 */
 367         /* this should trigger an "drag_data_received" event */
 368         gtk_drag_get_data( widget,
 369                            context,
 370                            format,
 371                            time );
 372
 373 #if wxUSE_THREADS
 374         /* re-enable GUI threads */
 375 #endif
 376     }
 377
 378     /* after this, invalidate the drop_target's GdkDragContext */
 379     drop_target->SetDragContext( (GdkDragContext*) NULL );
 380
 381     /* after this, invalidate the drop_target's drag widget */
 382     drop_target->SetDragWidget( (GtkWidget*) NULL );
 383
 384     /* this has to be done because GDK has no "drag_enter" event */
 385     drop_target->m_firstMotion = true;
 386
 387     return ret;
 388 }
 389 }
 390
 391 // ----------------------------------------------------------------------------
 392 // "drag_data_received"
 393 // ----------------------------------------------------------------------------
 394
 395 extern "C" {
 396 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 397                                        GdkDragContext *context,
 398                                        gint x,
 399                                        gint y,
 400                                        GtkSelectionData *data,
 401                                        guint WXUNUSED(info),
 402                                        guint time,
 403                                        wxDropTarget *drop_target )
 404 {
 405     if (g_isIdle) wxapp_install_idle_handler();
 406
 407     /* Owen Taylor: "call gtk_drag_finish() with
 408        success == TRUE" */
 409
 410     if ((data->length <= 0) || (data->format != 8))
 411     {
 412         /* negative data length and non 8-bit data format
 413            qualifies for junk */
 414         gtk_drag_finish (context, FALSE, FALSE, time);
 415
 416         return;
 417     }
 418
 419 #ifdef __WXDEBUG__
 420     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 421 #endif
 422
 423     /* inform the wxDropTarget about the current GtkSelectionData.
 424        this is only valid for the duration of this call */
 425     drop_target->SetDragData( data );
 426
 427     wxDragResult result = ConvertFromGTK(context->action);
 428
 429     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 430     {
 431 #ifdef __WXDEBUG__
 432         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned true") );
 433 #endif
 434
 435         /* tell GTK that data transfer was successful */
 436         gtk_drag_finish( context, TRUE, FALSE, time );
 437     }
 438     else
 439     {
 440 #ifdef __WXDEBUG__
 441         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 442 #endif
 443
 444         /* tell GTK that data transfer was not successful */
 445         gtk_drag_finish( context, FALSE, FALSE, time );
 446     }
 447
 448     /* after this, invalidate the drop_target's drag data */
 449     drop_target->SetDragData( (GtkSelectionData*) NULL );
 450 }
 451 }
 452
 453 //----------------------------------------------------------------------------
 454 // wxDropTarget
 455 //----------------------------------------------------------------------------
 456
 457 wxDropTarget::wxDropTarget( wxDataObject *data )
 458             : wxDropTargetBase( data )
 459 {
 460     m_firstMotion = true;
 461     m_dragContext = (GdkDragContext*) NULL;
 462     m_dragWidget = (GtkWidget*) NULL;
 463     m_dragData = (GtkSelectionData*) NULL;
 464     m_dragTime = 0;
 465 }
 466
 467 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 468                                        wxCoord WXUNUSED(y),
 469                                        wxDragResult def )
 470 {
 471     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 472
 473     // disable the debug message from GetMatchingPair() - there are too many
 474     // of them otherwise
 475 #ifdef __WXDEBUG__
 476     wxLogNull noLog;
 477 #endif // Debug
 478
 479     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 480 }
 481
 482 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 483 {
 484     if (!m_dataObject)
 485         return false;
 486
 487     return (GetMatchingPair() != (GdkAtom) 0);
 488 }
 489
 490 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 491                                    wxDragResult def )
 492 {
 493     if (!m_dataObject)
 494         return wxDragNone;
 495
 496     if (GetMatchingPair() == (GdkAtom) 0)
 497         return wxDragNone;
 498
 499     return GetData() ? def : wxDragNone;
 500 }
 501
 502 GdkAtom wxDropTarget::GetMatchingPair()
 503 {
 504     if (!m_dataObject)
 505         return (GdkAtom) 0;
 506
 507     if (!m_dragContext)
 508         return (GdkAtom) 0;
 509
 510     GList *child = m_dragContext->targets;
 511     while (child)
 512     {
 513         GdkAtom formatAtom = (GdkAtom)(child->data);
 514         wxDataFormat format( formatAtom );
 515
 516 #ifdef __WXDEBUG__
 517         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 518                    format.GetId().c_str());
 519 #endif // Debug
 520
 521         if (m_dataObject->IsSupportedFormat( format ))
 522             return formatAtom;
 523
 524         child = child->next;
 525     }
 526
 527     return (GdkAtom) 0;
 528 }
 529
 530 bool wxDropTarget::GetData()
 531 {
 532     if (!m_dragData)
 533         return false;
 534
 535     if (!m_dataObject)
 536         return false;
 537
 538     wxDataFormat dragFormat( m_dragData->target );
 539
 540     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 541         return false;
 542
 543     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 544
 545     return true;
 546 }
 547
 548 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 549 {
 550     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 551
 552     gtk_drag_dest_unset( widget );
 553
 554     g_signal_handlers_disconnect_by_func (widget,
 555                                           (gpointer) target_drag_leave, this);
 556     g_signal_handlers_disconnect_by_func (widget,
 557                                           (gpointer) target_drag_motion, this);
 558     g_signal_handlers_disconnect_by_func (widget,
 559                                           (gpointer) target_drag_drop, this);
 560     g_signal_handlers_disconnect_by_func (widget,
 561                                           (gpointer) target_drag_data_received, this);
 562 }
 563
 564 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 565 {
 566     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 567
 568     /* gtk_drag_dest_set() determines what default behaviour we'd like
 569        GTK to supply. we don't want to specify out targets (=formats)
 570        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 571        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 572        "drag_motion" and "drag_drop" events. this makes it possible
 573        to allow dropping on only a small area. we should set
 574        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 575        highlighting if dragging over standard controls, but this
 576        seems to be broken without the other two. */
 577
 578     gtk_drag_dest_set( widget,
 579                        (GtkDestDefaults) 0,         /* no default behaviour */
 580                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 581                        0,                           /* number of targets = 0 */
 582                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 583
 584     g_signal_connect (widget, "drag_leave",
 585                       G_CALLBACK (target_drag_leave), this);
 586
 587     g_signal_connect (widget, "drag_motion",
 588                       G_CALLBACK (target_drag_motion), this);
 589
 590     g_signal_connect (widget, "drag_drop",
 591                       G_CALLBACK (target_drag_drop), this);
 592
 593     g_signal_connect (widget, "drag_data_received",
 594                       G_CALLBACK (target_drag_data_received), this);
 595 }
 596
 597 //----------------------------------------------------------------------------
 598 // "drag_data_get"
 599 //----------------------------------------------------------------------------
 600
 601 extern "C" {
 602 static void
 603 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 604                        GdkDragContext     *WXUNUSED(context),
 605                        GtkSelectionData   *selection_data,
 606                        guint               WXUNUSED(info),
 607                        guint               WXUNUSED(time),
 608                        wxDropSource       *drop_source )
 609 {
 610     if (g_isIdle) wxapp_install_idle_handler();
 611
 612     wxDataFormat format( selection_data->target );
 613
 614 #ifdef __WXDEBUG__
 615     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 616                format.GetId().c_str());
 617 #endif
 618
 619     drop_source->m_retValue = wxDragCancel;
 620
 621     wxDataObject *data = drop_source->GetDataObject();
 622
 623     if (!data)
 624     {
 625 #ifdef __WXDEBUG__
 626         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 627 #endif
 628        return;
 629     }
 630
 631     if (!data->IsSupportedFormat(format))
 632     {
 633 #ifdef __WXDEBUG__
 634         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 635 #endif
 636        return;
 637     }
 638
 639     if (data->GetDataSize(format) == 0)
 640     {
 641 #ifdef __WXDEBUG__
 642         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 643 #endif
 644        return;
 645     }
 646
 647     size_t size = data->GetDataSize(format);
 648
 649 //  printf( "data size: %d.\n", (int)data_size );
 650
 651     guchar *d = new guchar[size];
 652
 653     if (!data->GetDataHere( format, (void*)d ))
 654     {
 655         delete[] d;
 656         return;
 657     }
 658
 659 #if wxUSE_THREADS
 660     /* disable GUI threads */
 661 #endif
 662
 663     gtk_selection_data_set( selection_data,
 664                             selection_data->target,
 665                             8,   // 8-bit
 666                             d,
 667                             size );
 668
 669 #if wxUSE_THREADS
 670     /* enable GUI threads */
 671 #endif
 672
 673     delete[] d;
 674 }
 675 }
 676
 677 //----------------------------------------------------------------------------
 678 // "drag_data_delete"
 679 //----------------------------------------------------------------------------
 680
 681 extern "C" {
 682 static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
 683                                      GdkDragContext *WXUNUSED(context),
 684                                      wxDropSource *WXUNUSED(drop_source) )
 685 {
 686     if (g_isIdle)
 687         wxapp_install_idle_handler();
 688
 689     // printf( "Drag source: drag_data_delete\n" );
 690 }
 691 }
 692
 693 //----------------------------------------------------------------------------
 694 // "drag_begin"
 695 //----------------------------------------------------------------------------
 696
 697 extern "C" {
 698 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 699                                GdkDragContext     *WXUNUSED(context),
 700                                wxDropSource       *WXUNUSED(drop_source) )
 701 {
 702     if (g_isIdle)
 703         wxapp_install_idle_handler();
 704
 705     // printf( "Drag source: drag_begin.\n" );
 706 }
 707 }
 708
 709 //----------------------------------------------------------------------------
 710 // "drag_end"
 711 //----------------------------------------------------------------------------
 712
 713 extern "C" {
 714 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 715                              GdkDragContext     *WXUNUSED(context),
 716                              wxDropSource       *drop_source )
 717 {
 718     if (g_isIdle) wxapp_install_idle_handler();
 719
 720     // printf( "Drag source: drag_end.\n" );
 721
 722     drop_source->m_waiting = false;
 723 }
 724 }
 725
 726 //-----------------------------------------------------------------------------
 727 // "configure_event" from m_iconWindow
 728 //-----------------------------------------------------------------------------
 729
 730 extern "C" {
 731 static gint
 732 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 733 {
 734     // don't need to install idle handler, its done from "event" signal
 735
 736     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 737
 738     return 0;
 739 }
 740 }
 741
 742 //---------------------------------------------------------------------------
 743 // wxDropSource
 744 //---------------------------------------------------------------------------
 745
 746 wxDropSource::wxDropSource(wxWindow *win,
 747                            const wxIcon &iconCopy,
 748                            const wxIcon &iconMove,
 749                            const wxIcon &iconNone)
 750 {
 751     m_waiting = true;
 752
 753     m_iconWindow = (GtkWidget*) NULL;
 754
 755     m_window = win;
 756     m_widget = win->m_widget;
 757     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 758
 759     m_retValue = wxDragCancel;
 760
 761     SetIcons(iconCopy, iconMove, iconNone);
 762 }
 763
 764 wxDropSource::wxDropSource(wxDataObject& data,
 765                            wxWindow *win,
 766                            const wxIcon &iconCopy,
 767                            const wxIcon &iconMove,
 768                            const wxIcon &iconNone)
 769 {
 770     m_waiting = true;
 771
 772     SetData( data );
 773
 774     m_iconWindow = (GtkWidget*) NULL;
 775
 776     m_window = win;
 777     m_widget = win->m_widget;
 778     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 779
 780     m_retValue = wxDragCancel;
 781
 782     SetIcons(iconCopy, iconMove, iconNone);
 783 }
 784
 785 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 786                             const wxIcon &iconMove,
 787                             const wxIcon &iconNone)
 788 {
 789     m_iconCopy = iconCopy;
 790     m_iconMove = iconMove;
 791     m_iconNone = iconNone;
 792
 793     if ( !m_iconCopy.Ok() )
 794         m_iconCopy = wxIcon(page_xpm);
 795     if ( !m_iconMove.Ok() )
 796         m_iconMove = m_iconCopy;
 797     if ( !m_iconNone.Ok() )
 798         m_iconNone = m_iconCopy;
 799 }
 800
 801 wxDropSource::~wxDropSource()
 802 {
 803 }
 804
 805 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 806 {
 807     // get the right icon to display
 808     wxIcon *icon = NULL;
 809     if ( action & GDK_ACTION_MOVE )
 810         icon = &m_iconMove;
 811     else if ( action & GDK_ACTION_COPY )
 812         icon = &m_iconCopy;
 813     else
 814         icon = &m_iconNone;
 815
 816     GdkBitmap *mask;
 817     if ( icon->GetMask() )
 818         mask = icon->GetMask()->GetBitmap();
 819     else
 820         mask = (GdkBitmap *)NULL;
 821
 822     GdkPixmap *pixmap = icon->GetPixmap();
 823
 824     gint width,height;
 825     gdk_drawable_get_size (pixmap, &width, &height);
 826
 827     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 828     gtk_widget_push_colormap (colormap);
 829
 830     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 831     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 832     gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
 833
 834     gtk_widget_pop_colormap ();
 835
 836     gtk_widget_set_size_request (m_iconWindow, width, height);
 837     gtk_widget_realize (m_iconWindow);
 838
 839     g_signal_connect (m_iconWindow, "configure_event",
 840                       G_CALLBACK (gtk_dnd_window_configure_callback), this);
 841
 842     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 843
 844     if (mask)
 845         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 846
 847     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 848 }
 849
 850 wxDragResult wxDropSource::DoDragDrop(int flags)
 851 {
 852     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 853                  wxT("Drop source: no data") );
 854
 855     // still in drag
 856     if (g_blockEventsOnDrag)
 857         return wxDragNone;
 858
 859     // don't start dragging if no button is down
 860     if (g_lastButtonNumber == 0)
 861         return wxDragNone;
 862
 863     // we can only start a drag after a mouse event
 864     if (g_lastMouseEvent == NULL)
 865         return wxDragNone;
 866
 867     // disabled for now
 868     g_blockEventsOnDrag = true;
 869
 870     RegisterWindow();
 871
 872     m_waiting = true;
 873
 874     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 875
 876     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 877     m_data->GetAllFormats( array );
 878     size_t count = m_data->GetFormatCount();
 879     for (size_t i = 0; i < count; i++)
 880     {
 881         GdkAtom atom = array[i];
 882 #ifdef __WXDEBUG__
 883         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 884 #endif
 885        gtk_target_list_add( target_list, atom, 0, 0 );
 886     }
 887     delete[] array;
 888
 889     int action = GDK_ACTION_COPY;
 890     if ( flags & wxDrag_AllowMove )
 891         action |= GDK_ACTION_MOVE;
 892
 893     // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 894     //     to use a global to pass the flags to the drop target but I'd
 895     //     surely prefer a better way to do it
 896     gs_flagsForDrag = flags;
 897
 898     GdkDragContext *context = gtk_drag_begin( m_widget,
 899                 target_list,
 900                 (GdkDragAction)action,
 901                 g_lastButtonNumber,  // number of mouse button which started drag
 902                 (GdkEvent*) g_lastMouseEvent );
 903
 904     m_dragContext = context;
 905
 906     PrepareIcon( action, context );
 907
 908     while (m_waiting)
 909         gtk_main_iteration();
 910
 911     m_retValue = ConvertFromGTK(context->action);
 912     if ( m_retValue == wxDragNone )
 913          m_retValue = wxDragCancel;
 914
 915     g_blockEventsOnDrag = false;
 916
 917     UnregisterWindow();
 918
 919     return m_retValue;
 920 }
 921
 922 void wxDropSource::RegisterWindow()
 923 {
 924     if (!m_widget) return;
 925
 926     g_signal_connect (m_widget, "drag_data_get",
 927                       G_CALLBACK (source_drag_data_get), this);
 928     g_signal_connect (m_widget, "drag_data_delete",
 929                       G_CALLBACK (source_drag_data_delete), this);
 930     g_signal_connect (m_widget, "drag_begin",
 931                       G_CALLBACK (source_drag_begin), this);
 932     g_signal_connect (m_widget, "drag_end",
 933                       G_CALLBACK (source_drag_end), this);
 934
 935 }
 936
 937 void wxDropSource::UnregisterWindow()
 938 {
 939     if (!m_widget)
 940         return;
 941
 942     g_signal_handlers_disconnect_by_func (m_widget,
 943                                           (gpointer) source_drag_data_get,
 944                                           this);
 945     g_signal_handlers_disconnect_by_func (m_widget,
 946                                           (gpointer) source_drag_data_delete,
 947                                           this);
 948     g_signal_handlers_disconnect_by_func (m_widget,
 949                                           (gpointer) source_drag_begin,
 950                                           this);
 951     g_signal_handlers_disconnect_by_func (m_widget,
 952                                           (gpointer) source_drag_end,
 953                                           this);
 954 }
 955
 956 #endif
 957       // wxUSE_DRAG_AND_DROP