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