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