src/gtk/dnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #include "wx/dnd.h"
  14 #include "wx/log.h"
  15
  16
  17 #if wxUSE_DRAG_AND_DROP
  18
  19 #include "wx/window.h"
  20 #include "wx/app.h"
  21 #include "wx/gdicmn.h"
  22 #include "wx/intl.h"
  23 #include "wx/utils.h"
  24
  25 #include "wx/gtk/private.h"
  26
  27 #include <gdk/gdkprivate.h>
  28
  29 #include <gtk/gtkdnd.h>
  30 #include <gtk/gtkselection.h>
  31
  32 //-----------------------------------------------------------------------------
  33 // idle system
  34 //-----------------------------------------------------------------------------
  35
  36 extern void wxapp_install_idle_handler();
  37 extern bool g_isIdle;
  38
  39 //----------------------------------------------------------------------------
  40 // global data
  41 //----------------------------------------------------------------------------
  42
  43 extern bool g_blockEventsOnDrag;
  44
  45 // the flags used for the last DoDragDrop()
  46 static long gs_flagsForDrag = 0;
  47
  48 // the trace mask we use with wxLogTrace() - call
  49 // wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
  50 // (there are quite a few of them, so don't enable this by default)
  51 static const wxChar *TRACE_DND = _T("dnd");
  52
  53 //----------------------------------------------------------------------------
  54 // standard icons
  55 //----------------------------------------------------------------------------
  56
  57 /* Copyright (c) Julian Smart */
  58 static const char * page_xpm[] = {
  59 /* columns rows colors chars-per-pixel */
  60 "32 32 37 1",
  61 "5 c #7198D9",
  62 ", c #769CDA",
  63 "2 c #DCE6F6",
  64 "i c #FFFFFF",
  65 "e c #779DDB",
  66 ": c #9AB6E4",
  67 "9 c #EAF0FA",
  68 "- c #B1C7EB",
  69 "$ c #6992D7",
  70 "y c #F7F9FD",
  71 "= c #BED0EE",
  72 "q c #F0F5FC",
  73 "; c #A8C0E8",
  74 "@ c #366BC2",
  75 "  c None",
  76 "u c #FDFEFF",
  77 "8 c #5987D3",
  78 "* c #C4D5F0",
  79 "7 c #7CA0DC",
  80 "O c #487BCE",
  81 "< c #6B94D7",
  82 "& c #CCDAF2",
  83 "> c #89A9DF",
  84 "3 c #5584D1",
  85 "w c #82A5DE",
  86 "1 c #3F74CB",
  87 "+ c #3A70CA",
  88 ". c #3569BF",
  89 "% c #D2DFF4",
  90 "# c #3366BB",
  91 "r c #F5F8FD",
  92 "0 c #FAFCFE",
  93 "4 c #DFE8F7",
  94 "X c #5E8AD4",
  95 "o c #5282D0",
  96 "t c #B8CCEC",
  97 "6 c #E5EDF9",
  98 /* pixels */
  99 "                                ",
 100 "                                ",
 101 "                                ",
 102 "                                ",
 103 "                                ",
 104 "       .XXXooOO++@#             ",
 105 "       $%&*=-;::>,<1            ",
 106 "       $2%&*=-;::><:3           ",
 107 "       $42%&*=-;::<&:3          ",
 108 "       56477<<<<8<<9&:X         ",
 109 "       59642%&*=-;<09&:5        ",
 110 "       5q9642%&*=-<<<<<#        ",
 111 "       5qqw777<<<<<88:>+        ",
 112 "       erqq9642%&*=t;::+        ",
 113 "       eyrqq9642%&*=t;:O        ",
 114 "       eyywwww777<<<<t;O        ",
 115 "       e0yyrqq9642%&*=to        ",
 116 "       e00yyrqq9642%&*=o        ",
 117 "       eu0wwwwwww777<&*X        ",
 118 "       euu00yyrqq9642%&X        ",
 119 "       eiuu00yyrqq9642%X        ",
 120 "       eiiwwwwwwwwww742$        ",
 121 "       eiiiuu00yyrqq964$        ",
 122 "       eiiiiuu00yyrqq96$        ",
 123 "       eiiiiiuu00yyrqq95        ",
 124 "       eiiiiiiuu00yyrqq5        ",
 125 "       eeeeeeeeeeeeee55e        ",
 126 "                                ",
 127 "                                ",
 128 "                                ",
 129 "                                ",
 130 "                                "
 131 };
 132
 133
 134 // ============================================================================
 135 // private functions
 136 // ============================================================================
 137
 138 // ----------------------------------------------------------------------------
 139 // convert between GTK+ and wxWidgets DND constants
 140 // ----------------------------------------------------------------------------
 141
 142 static wxDragResult ConvertFromGTK(long action)
 143 {
 144     switch ( action )
 145     {
 146         case GDK_ACTION_COPY:
 147             return wxDragCopy;
 148
 149         case GDK_ACTION_LINK:
 150             return wxDragLink;
 151
 152         case GDK_ACTION_MOVE:
 153             return wxDragMove;
 154     }
 155
 156     return wxDragNone;
 157 }
 158
 159 // ----------------------------------------------------------------------------
 160 // "drag_leave"
 161 // ----------------------------------------------------------------------------
 162
 163 extern "C" {
 164 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 165                                GdkDragContext *context,
 166                                guint WXUNUSED(time),
 167                                wxDropTarget *drop_target )
 168 {
 169     if (g_isIdle) wxapp_install_idle_handler();
 170
 171     /* inform the wxDropTarget about the current GdkDragContext.
 172        this is only valid for the duration of this call */
 173     drop_target->SetDragContext( context );
 174
 175     /* we don't need return values. this event is just for
 176        information */
 177     drop_target->OnLeave();
 178
 179     /* this has to be done because GDK has no "drag_enter" event */
 180     drop_target->m_firstMotion = true;
 181
 182     /* after this, invalidate the drop_target's GdkDragContext */
 183     drop_target->SetDragContext( (GdkDragContext*) NULL );
 184 }
 185 }
 186
 187 // ----------------------------------------------------------------------------
 188 // "drag_motion"
 189 // ----------------------------------------------------------------------------
 190
 191 extern "C" {
 192 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 193                                     GdkDragContext *context,
 194                                     gint x,
 195                                     gint y,
 196                                     guint time,
 197                                     wxDropTarget *drop_target )
 198 {
 199     if (g_isIdle) wxapp_install_idle_handler();
 200
 201     /* Owen Taylor: "if the coordinates not in a drop zone,
 202        return FALSE, otherwise call gtk_drag_status() and
 203        return TRUE" */
 204
 205     /* inform the wxDropTarget about the current GdkDragContext.
 206        this is only valid for the duration of this call */
 207     drop_target->SetDragContext( context );
 208
 209     // GTK+ always supposes that we want to copy the data by default while we
 210     // might want to move it, so examine not only suggested_action - which is
 211     // only good if we don't have our own preferences - but also the actions
 212     // field
 213     wxDragResult result;
 214     if (drop_target->GetDefaultAction() == wxDragNone)
 215     {
 216         // use default action set by wxDropSource::DoDragDrop()
 217     if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 218             (context->actions & GDK_ACTION_MOVE ) )
 219     {
 220         // move is requested by the program and allowed by GTK+ - do it, even
 221         // though suggested_action may be currently wxDragCopy
 222         result = wxDragMove;
 223     }
 224     else // use whatever GTK+ says we should
 225     {
 226         result = ConvertFromGTK(context->suggested_action);
 227
 228         if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 229         {
 230             // we're requested to move but we can't
 231             result = wxDragCopy;
 232         }
 233     }
 234     }
 235     else if (drop_target->GetDefaultAction() == wxDragMove &&
 236                 (context->actions & GDK_ACTION_MOVE))
 237     {
 238        result = wxDragMove;
 239     }
 240     else
 241     {
 242         if (context->actions & GDK_ACTION_COPY)
 243             result = wxDragCopy;
 244         else if (context->actions & GDK_ACTION_MOVE)
 245             result = wxDragMove;
 246         else
 247             result = wxDragNone;
 248     }
 249
 250     if (drop_target->m_firstMotion)
 251     {
 252         /* the first "drag_motion" event substitutes a "drag_enter" event */
 253         result = drop_target->OnEnter( x, y, result );
 254     }
 255     else
 256     {
 257         /* give program a chance to react (i.e. to say no by returning FALSE) */
 258         result = drop_target->OnDragOver( x, y, result );
 259     }
 260
 261     bool ret = wxIsDragResultOk( result );
 262     if (ret)
 263     {
 264         GdkDragAction action;
 265         if (result == wxDragCopy)
 266             action = GDK_ACTION_COPY;
 267         else if (result == wxDragLink)
 268             action = GDK_ACTION_LINK;
 269         else
 270             action = GDK_ACTION_MOVE;
 271
 272         gdk_drag_status( context, action, time );
 273     }
 274
 275     /* after this, invalidate the drop_target's GdkDragContext */
 276     drop_target->SetDragContext( (GdkDragContext*) NULL );
 277
 278     /* this has to be done because GDK has no "drag_enter" event */
 279     drop_target->m_firstMotion = false;
 280
 281     return ret;
 282 }
 283 }
 284
 285 // ----------------------------------------------------------------------------
 286 // "drag_drop"
 287 // ----------------------------------------------------------------------------
 288
 289 extern "C" {
 290 static gboolean target_drag_drop( GtkWidget *widget,
 291                                   GdkDragContext *context,
 292                                   gint x,
 293                                   gint y,
 294                                   guint time,
 295                                   wxDropTarget *drop_target )
 296 {
 297     if (g_isIdle) wxapp_install_idle_handler();
 298
 299     /* Owen Taylor: "if the drop is not in a drop zone,
 300        return FALSE, otherwise, if you aren't accepting
 301        the drop, call gtk_drag_finish() with success == FALSE
 302        otherwise call gtk_drag_data_get()" */
 303
 304 //    printf( "drop.\n" );
 305
 306     /* this seems to make a difference between not accepting
 307        due to wrong target area and due to wrong format. let
 308        us hope that this is not required.. */
 309
 310     /* inform the wxDropTarget about the current GdkDragContext.
 311        this is only valid for the duration of this call */
 312     drop_target->SetDragContext( context );
 313
 314     /* inform the wxDropTarget about the current drag widget.
 315        this is only valid for the duration of this call */
 316     drop_target->SetDragWidget( widget );
 317
 318     /* inform the wxDropTarget about the current drag time.
 319        this is only valid for the duration of this call */
 320     drop_target->SetDragTime( time );
 321
 322 /*
 323     wxDragResult result = wxDragMove;
 324     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 325 */
 326
 327     /* reset the block here as someone might very well
 328        show a dialog as a reaction to a drop and this
 329        wouldn't work without events */
 330     g_blockEventsOnDrag = false;
 331
 332     bool ret = drop_target->OnDrop( x, y );
 333
 334     if (!ret)
 335     {
 336         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 337
 338         /* cancel the whole thing */
 339         gtk_drag_finish( context,
 340                           FALSE,        /* no success */
 341                           FALSE,        /* don't delete data on dropping side */
 342                           time );
 343     }
 344     else
 345     {
 346         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned TRUE") );
 347
 348 #if wxUSE_THREADS
 349         /* disable GUI threads */
 350 #endif
 351
 352         GdkAtom format = drop_target->GetMatchingPair();
 353
 354         // this does happen somehow, see bug 555111
 355         wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") )
 356
 357 /*
 358         GdkDragAction action = GDK_ACTION_MOVE;
 359         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 360         context->action = action;
 361 */
 362         /* this should trigger an "drag_data_received" event */
 363         gtk_drag_get_data( widget,
 364                            context,
 365                            format,
 366                            time );
 367
 368 #if wxUSE_THREADS
 369         /* re-enable GUI threads */
 370 #endif
 371     }
 372
 373     /* after this, invalidate the drop_target's GdkDragContext */
 374     drop_target->SetDragContext( (GdkDragContext*) NULL );
 375
 376     /* after this, invalidate the drop_target's drag widget */
 377     drop_target->SetDragWidget( (GtkWidget*) NULL );
 378
 379     /* this has to be done because GDK has no "drag_enter" event */
 380     drop_target->m_firstMotion = true;
 381
 382     return ret;
 383 }
 384 }
 385
 386 // ----------------------------------------------------------------------------
 387 // "drag_data_received"
 388 // ----------------------------------------------------------------------------
 389
 390 extern "C" {
 391 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 392                                        GdkDragContext *context,
 393                                        gint x,
 394                                        gint y,
 395                                        GtkSelectionData *data,
 396                                        guint WXUNUSED(info),
 397                                        guint time,
 398                                        wxDropTarget *drop_target )
 399 {
 400     if (g_isIdle) wxapp_install_idle_handler();
 401
 402     /* Owen Taylor: "call gtk_drag_finish() with
 403        success == TRUE" */
 404
 405     if ((data->length <= 0) || (data->format != 8))
 406     {
 407         /* negative data length and non 8-bit data format
 408            qualifies for junk */
 409         gtk_drag_finish (context, FALSE, FALSE, time);
 410
 411         return;
 412     }
 413
 414     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 415
 416     /* inform the wxDropTarget about the current GtkSelectionData.
 417        this is only valid for the duration of this call */
 418     drop_target->SetDragData( data );
 419
 420     wxDragResult result = ConvertFromGTK(context->action);
 421
 422     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 423     {
 424         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned TRUE") );
 425
 426         /* tell GTK that data transfer was successful */
 427         gtk_drag_finish( context, TRUE, FALSE, time );
 428     }
 429     else
 430     {
 431         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 432
 433         /* tell GTK that data transfer was not successful */
 434         gtk_drag_finish( context, FALSE, FALSE, time );
 435     }
 436
 437     /* after this, invalidate the drop_target's drag data */
 438     drop_target->SetDragData( (GtkSelectionData*) NULL );
 439 }
 440 }
 441
 442 //----------------------------------------------------------------------------
 443 // wxDropTarget
 444 //----------------------------------------------------------------------------
 445
 446 wxDropTarget::wxDropTarget( wxDataObject *data )
 447             : wxDropTargetBase( data )
 448 {
 449     m_firstMotion = true;
 450     m_dragContext = (GdkDragContext*) NULL;
 451     m_dragWidget = (GtkWidget*) NULL;
 452     m_dragData = (GtkSelectionData*) NULL;
 453     m_dragTime = 0;
 454 }
 455
 456 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 457                                        wxCoord WXUNUSED(y),
 458                                        wxDragResult def )
 459 {
 460     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 461
 462     // disable the debug message from GetMatchingPair() - there are too many
 463     // of them otherwise
 464 #ifdef __WXDEBUG__
 465     wxLogNull noLog;
 466 #endif // Debug
 467
 468     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 469 }
 470
 471 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 472 {
 473     if (!m_dataObject)
 474         return false;
 475
 476     return (GetMatchingPair() != (GdkAtom) 0);
 477 }
 478
 479 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 480                                    wxDragResult def )
 481 {
 482     if (!m_dataObject)
 483         return wxDragNone;
 484
 485     if (GetMatchingPair() == (GdkAtom) 0)
 486         return wxDragNone;
 487
 488     return GetData() ? def : wxDragNone;
 489 }
 490
 491 GdkAtom wxDropTarget::GetMatchingPair()
 492 {
 493     if (!m_dataObject)
 494         return (GdkAtom) 0;
 495
 496     if (!m_dragContext)
 497         return (GdkAtom) 0;
 498
 499     GList *child = m_dragContext->targets;
 500     while (child)
 501     {
 502         GdkAtom formatAtom = (GdkAtom)(child->data);
 503         wxDataFormat format( formatAtom );
 504
 505 #ifdef __WXDEBUG__
 506         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 507                    format.GetId().c_str());
 508 #endif // Debug
 509
 510         if (m_dataObject->IsSupportedFormat( format ))
 511             return formatAtom;
 512
 513         child = child->next;
 514     }
 515
 516     return (GdkAtom) 0;
 517 }
 518
 519 bool wxDropTarget::GetData()
 520 {
 521     if (!m_dragData)
 522         return false;
 523
 524     if (!m_dataObject)
 525         return false;
 526
 527     wxDataFormat dragFormat( m_dragData->target );
 528
 529     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 530         return false;
 531
 532     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 533
 534     return true;
 535 }
 536
 537 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 538 {
 539     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 540
 541     gtk_drag_dest_unset( widget );
 542
 543     g_signal_handlers_disconnect_by_func (widget,
 544                                           (gpointer) target_drag_leave, this);
 545     g_signal_handlers_disconnect_by_func (widget,
 546                                           (gpointer) target_drag_motion, this);
 547     g_signal_handlers_disconnect_by_func (widget,
 548                                           (gpointer) target_drag_drop, this);
 549     g_signal_handlers_disconnect_by_func (widget,
 550                                           (gpointer) target_drag_data_received, this);
 551 }
 552
 553 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 554 {
 555     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 556
 557     /* gtk_drag_dest_set() determines what default behaviour we'd like
 558        GTK to supply. we don't want to specify out targets (=formats)
 559        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 560        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 561        "drag_motion" and "drag_drop" events. this makes it possible
 562        to allow dropping on only a small area. we should set
 563        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 564        highlighting if dragging over standard controls, but this
 565        seems to be broken without the other two. */
 566
 567     gtk_drag_dest_set( widget,
 568                        (GtkDestDefaults) 0,         /* no default behaviour */
 569                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 570                        0,                           /* number of targets = 0 */
 571                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 572
 573     g_signal_connect (widget, "drag_leave",
 574                       G_CALLBACK (target_drag_leave), this);
 575
 576     g_signal_connect (widget, "drag_motion",
 577                       G_CALLBACK (target_drag_motion), this);
 578
 579     g_signal_connect (widget, "drag_drop",
 580                       G_CALLBACK (target_drag_drop), this);
 581
 582     g_signal_connect (widget, "drag_data_received",
 583                       G_CALLBACK (target_drag_data_received), this);
 584 }
 585
 586 //----------------------------------------------------------------------------
 587 // "drag_data_get"
 588 //----------------------------------------------------------------------------
 589
 590 extern "C" {
 591 static void
 592 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 593                        GdkDragContext     *WXUNUSED(context),
 594                        GtkSelectionData   *selection_data,
 595                        guint               WXUNUSED(info),
 596                        guint               WXUNUSED(time),
 597                        wxDropSource       *drop_source )
 598 {
 599     if (g_isIdle) wxapp_install_idle_handler();
 600
 601     wxDataFormat format( selection_data->target );
 602
 603     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 604                format.GetId().c_str());
 605
 606     drop_source->m_retValue = wxDragCancel;
 607
 608     wxDataObject *data = drop_source->GetDataObject();
 609
 610     if (!data)
 611     {
 612         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 613         return;
 614     }
 615
 616     if (!data->IsSupportedFormat(format))
 617     {
 618         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 619         return;
 620     }
 621
 622     if (data->GetDataSize(format) == 0)
 623     {
 624         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 625         return;
 626     }
 627
 628     size_t size = data->GetDataSize(format);
 629
 630 //  printf( "data size: %d.\n", (int)data_size );
 631
 632     guchar *d = new guchar[size];
 633
 634     if (!data->GetDataHere( format, (void*)d ))
 635     {
 636         delete[] d;
 637         return;
 638     }
 639
 640 #if wxUSE_THREADS
 641     /* disable GUI threads */
 642 #endif
 643
 644     gtk_selection_data_set( selection_data,
 645                             selection_data->target,
 646                             8,   // 8-bit
 647                             d,
 648                             size );
 649
 650 #if wxUSE_THREADS
 651     /* enable GUI threads */
 652 #endif
 653
 654     delete[] d;
 655 }
 656 }
 657
 658 //----------------------------------------------------------------------------
 659 // "drag_data_delete"
 660 //----------------------------------------------------------------------------
 661
 662 extern "C" {
 663 static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
 664                                      GdkDragContext *context,
 665                                      wxDropSource *WXUNUSED(drop_source) )
 666 {
 667     if (g_isIdle)
 668         wxapp_install_idle_handler();
 669
 670     // printf( "Drag source: drag_data_delete\n" );
 671 }
 672 }
 673
 674 //----------------------------------------------------------------------------
 675 // "drag_begin"
 676 //----------------------------------------------------------------------------
 677
 678 extern "C" {
 679 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 680                                GdkDragContext     *WXUNUSED(context),
 681                                wxDropSource       *WXUNUSED(drop_source) )
 682 {
 683     if (g_isIdle)
 684         wxapp_install_idle_handler();
 685
 686     // printf( "Drag source: drag_begin.\n" );
 687 }
 688 }
 689
 690 //----------------------------------------------------------------------------
 691 // "drag_end"
 692 //----------------------------------------------------------------------------
 693
 694 extern "C" {
 695 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 696                              GdkDragContext     *WXUNUSED(context),
 697                              wxDropSource       *drop_source )
 698 {
 699     if (g_isIdle) wxapp_install_idle_handler();
 700
 701     // printf( "Drag source: drag_end.\n" );
 702
 703     drop_source->m_waiting = false;
 704 }
 705 }
 706
 707 //-----------------------------------------------------------------------------
 708 // "configure_event" from m_iconWindow
 709 //-----------------------------------------------------------------------------
 710
 711 extern "C" {
 712 static gint
 713 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 714 {
 715     if (g_isIdle)
 716         wxapp_install_idle_handler();
 717
 718     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 719
 720     return 0;
 721 }
 722 }
 723
 724 //---------------------------------------------------------------------------
 725 // wxDropSource
 726 //---------------------------------------------------------------------------
 727
 728 wxDropSource::wxDropSource(wxWindow *win,
 729                            const wxIcon &iconCopy,
 730                            const wxIcon &iconMove,
 731                            const wxIcon &iconNone)
 732 {
 733     m_waiting = true;
 734
 735     m_iconWindow = (GtkWidget*) NULL;
 736
 737     m_window = win;
 738     m_widget = win->m_widget;
 739     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 740
 741     m_retValue = wxDragCancel;
 742
 743     SetIcons(iconCopy, iconMove, iconNone);
 744 }
 745
 746 wxDropSource::wxDropSource(wxDataObject& data,
 747                            wxWindow *win,
 748                            const wxIcon &iconCopy,
 749                            const wxIcon &iconMove,
 750                            const wxIcon &iconNone)
 751 {
 752     m_waiting = true;
 753
 754     SetData( data );
 755
 756     m_iconWindow = (GtkWidget*) NULL;
 757
 758     m_window = win;
 759     m_widget = win->m_widget;
 760     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 761
 762     m_retValue = wxDragCancel;
 763
 764     SetIcons(iconCopy, iconMove, iconNone);
 765 }
 766
 767 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 768                             const wxIcon &iconMove,
 769                             const wxIcon &iconNone)
 770 {
 771     m_iconCopy = iconCopy;
 772     m_iconMove = iconMove;
 773     m_iconNone = iconNone;
 774
 775     if ( !m_iconCopy.Ok() )
 776         m_iconCopy = wxIcon(page_xpm);
 777     if ( !m_iconMove.Ok() )
 778         m_iconMove = m_iconCopy;
 779     if ( !m_iconNone.Ok() )
 780         m_iconNone = m_iconCopy;
 781 }
 782
 783 wxDropSource::~wxDropSource()
 784 {
 785 }
 786
 787 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 788 {
 789     // get the right icon to display
 790     wxIcon *icon = NULL;
 791     if ( action & GDK_ACTION_MOVE )
 792         icon = &m_iconMove;
 793     else if ( action & GDK_ACTION_COPY )
 794         icon = &m_iconCopy;
 795     else
 796         icon = &m_iconNone;
 797
 798     GdkBitmap *mask;
 799     if ( icon->GetMask() )
 800         mask = icon->GetMask()->GetBitmap();
 801     else
 802         mask = (GdkBitmap *)NULL;
 803
 804     GdkPixmap *pixmap = icon->GetPixmap();
 805
 806     gint width,height;
 807     gdk_window_get_size (pixmap, &width, &height);
 808
 809     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 810     gtk_widget_push_colormap (colormap);
 811
 812     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 813     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 814     gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
 815
 816     gtk_widget_pop_colormap ();
 817
 818     gtk_widget_set_size_request (m_iconWindow, width, height);
 819     gtk_widget_realize (m_iconWindow);
 820
 821     g_signal_connect (m_iconWindow, "configure_event",
 822                       G_CALLBACK (gtk_dnd_window_configure_callback), this);
 823
 824     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 825
 826     if (mask)
 827         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 828
 829     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 830 }
 831
 832 wxDragResult wxDropSource::DoDragDrop(int flags)
 833 {
 834     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 835                  wxT("Drop source: no data") );
 836
 837     // still in drag
 838     if (g_blockEventsOnDrag)
 839         return wxDragNone;
 840
 841     // disabled for now
 842     g_blockEventsOnDrag = true;
 843
 844     RegisterWindow();
 845
 846     m_waiting = true;
 847
 848     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 849
 850     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 851     m_data->GetAllFormats( array );
 852     size_t count = m_data->GetFormatCount();
 853     for (size_t i = 0; i < count; i++)
 854     {
 855         GdkAtom atom = array[i];
 856         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 857         gtk_target_list_add( target_list, atom, 0, 0 );
 858     }
 859     delete[] array;
 860
 861     GdkEventMotion event;
 862     event.window = m_widget->window;
 863     int x = 0;
 864     int y = 0;
 865     GdkModifierType state;
 866     gdk_window_get_pointer( event.window, &x, &y, &state );
 867     event.x = x;
 868     event.y = y;
 869     event.state = state;
 870     event.time = (guint32)GDK_CURRENT_TIME;
 871
 872     /* GTK wants to know which button was pressed which caused the dragging */
 873     int button_number = 0;
 874     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 875     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 876     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 877
 878 #if wxUSE_THREADS
 879     /* disable GUI threads */
 880 #endif
 881
 882     /* don't start dragging if no button is down */
 883     if (button_number)
 884     {
 885         int action = GDK_ACTION_COPY;
 886         if ( flags & wxDrag_AllowMove )
 887             action |= GDK_ACTION_MOVE;
 888
 889         // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 890         //     to use a global to pass the flags to the drop target but I'd
 891         //     surely prefer a better way to do it
 892         gs_flagsForDrag = flags;
 893
 894         GdkDragContext *context = gtk_drag_begin( m_widget,
 895                 target_list,
 896                 (GdkDragAction)action,
 897                 button_number,  /* number of mouse button which started drag */
 898                 (GdkEvent*) &event );
 899
 900         m_dragContext = context;
 901
 902         PrepareIcon( action, context );
 903
 904         while (m_waiting)
 905             gtk_main_iteration();
 906
 907         m_retValue = ConvertFromGTK(context->action);
 908         if ( m_retValue == wxDragNone )
 909             m_retValue = wxDragCancel;
 910     }
 911
 912 #if wxUSE_THREADS
 913     /* re-enable GUI threads */
 914 #endif
 915
 916     g_blockEventsOnDrag = false;
 917
 918     UnregisterWindow();
 919
 920     return m_retValue;
 921 }
 922
 923 void wxDropSource::RegisterWindow()
 924 {
 925     if (!m_widget) return;
 926
 927     g_signal_connect (m_widget, "drag_data_get",
 928                       G_CALLBACK (source_drag_data_get), this);
 929     g_signal_connect (m_widget, "drag_data_delete",
 930                       G_CALLBACK (source_drag_data_delete), this);
 931     g_signal_connect (m_widget, "drag_begin",
 932                       G_CALLBACK (source_drag_begin), this);
 933     g_signal_connect (m_widget, "drag_end",
 934                       G_CALLBACK (source_drag_end), this);
 935
 936 }
 937
 938 void wxDropSource::UnregisterWindow()
 939 {
 940     if (!m_widget)
 941         return;
 942
 943     g_signal_handlers_disconnect_by_func (m_widget,
 944                                           (gpointer) source_drag_data_get,
 945                                           this);
 946     g_signal_handlers_disconnect_by_func (m_widget,
 947                                           (gpointer) source_drag_data_delete,
 948                                           this);
 949     g_signal_handlers_disconnect_by_func (m_widget,
 950                                           (gpointer) source_drag_begin,
 951                                           this);
 952     g_signal_handlers_disconnect_by_func (m_widget,
 953                                           (gpointer) source_drag_end,
 954                                           this);
 955 }
 956
 957 #endif
 958       // wxUSE_DRAG_AND_DROP