src/gtk/dnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk/dnd.cpp
   3 // Purpose:     wxDropTarget class
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #if wxUSE_DRAG_AND_DROP
  14
  15 #include "wx/dnd.h"
  16
  17 #ifndef WX_PRECOMP
  18     #include "wx/intl.h"
  19     #include "wx/log.h"
  20     #include "wx/app.h"
  21     #include "wx/utils.h"
  22     #include "wx/window.h"
  23     #include "wx/gdicmn.h"
  24 #endif
  25
  26 #include "wx/gtk/private.h"
  27
  28 #include <gdk/gdkprivate.h>
  29
  30 #include <gtk/gtkdnd.h>
  31 #include <gtk/gtkselection.h>
  32
  33 //----------------------------------------------------------------------------
  34 // global data
  35 //----------------------------------------------------------------------------
  36
  37 extern bool g_blockEventsOnDrag;
  38
  39 // the flags used for the last DoDragDrop()
  40 static long gs_flagsForDrag = 0;
  41
  42 // the trace mask we use with wxLogTrace() - call
  43 // wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
  44 // (there are quite a few of them, so don't enable this by default)
  45 static const wxChar *TRACE_DND = _T("dnd");
  46
  47 extern GdkEvent *g_lastMouseEvent;
  48
  49 extern int g_lastButtonNumber;
  50
  51 //----------------------------------------------------------------------------
  52 // standard icons
  53 //----------------------------------------------------------------------------
  54
  55 /* Copyright (c) Julian Smart */
  56 static const char * page_xpm[] = {
  57 /* columns rows colors chars-per-pixel */
  58 "32 32 37 1",
  59 "5 c #7198D9",
  60 ", c #769CDA",
  61 "2 c #DCE6F6",
  62 "i c #FFFFFF",
  63 "e c #779DDB",
  64 ": c #9AB6E4",
  65 "9 c #EAF0FA",
  66 "- c #B1C7EB",
  67 "$ c #6992D7",
  68 "y c #F7F9FD",
  69 "= c #BED0EE",
  70 "q c #F0F5FC",
  71 "; c #A8C0E8",
  72 "@ c #366BC2",
  73 "  c None",
  74 "u c #FDFEFF",
  75 "8 c #5987D3",
  76 "* c #C4D5F0",
  77 "7 c #7CA0DC",
  78 "O c #487BCE",
  79 "< c #6B94D7",
  80 "& c #CCDAF2",
  81 "> c #89A9DF",
  82 "3 c #5584D1",
  83 "w c #82A5DE",
  84 "1 c #3F74CB",
  85 "+ c #3A70CA",
  86 ". c #3569BF",
  87 "% c #D2DFF4",
  88 "# c #3366BB",
  89 "r c #F5F8FD",
  90 "0 c #FAFCFE",
  91 "4 c #DFE8F7",
  92 "X c #5E8AD4",
  93 "o c #5282D0",
  94 "t c #B8CCEC",
  95 "6 c #E5EDF9",
  96 /* pixels */
  97 "                                ",
  98 "                                ",
  99 "                                ",
 100 "                                ",
 101 "                                ",
 102 "       .XXXooOO++@#             ",
 103 "       $%&*=-;::>,<1            ",
 104 "       $2%&*=-;::><:3           ",
 105 "       $42%&*=-;::<&:3          ",
 106 "       56477<<<<8<<9&:X         ",
 107 "       59642%&*=-;<09&:5        ",
 108 "       5q9642%&*=-<<<<<#        ",
 109 "       5qqw777<<<<<88:>+        ",
 110 "       erqq9642%&*=t;::+        ",
 111 "       eyrqq9642%&*=t;:O        ",
 112 "       eyywwww777<<<<t;O        ",
 113 "       e0yyrqq9642%&*=to        ",
 114 "       e00yyrqq9642%&*=o        ",
 115 "       eu0wwwwwww777<&*X        ",
 116 "       euu00yyrqq9642%&X        ",
 117 "       eiuu00yyrqq9642%X        ",
 118 "       eiiwwwwwwwwww742$        ",
 119 "       eiiiuu00yyrqq964$        ",
 120 "       eiiiiuu00yyrqq96$        ",
 121 "       eiiiiiuu00yyrqq95        ",
 122 "       eiiiiiiuu00yyrqq5        ",
 123 "       eeeeeeeeeeeeee55e        ",
 124 "                                ",
 125 "                                ",
 126 "                                ",
 127 "                                ",
 128 "                                "
 129 };
 130
 131
 132 // ============================================================================
 133 // private functions
 134 // ============================================================================
 135
 136 // ----------------------------------------------------------------------------
 137 // convert between GTK+ and wxWidgets DND constants
 138 // ----------------------------------------------------------------------------
 139
 140 static wxDragResult ConvertFromGTK(long action)
 141 {
 142     switch ( action )
 143     {
 144         case GDK_ACTION_COPY:
 145             return wxDragCopy;
 146
 147         case GDK_ACTION_LINK:
 148             return wxDragLink;
 149
 150         case GDK_ACTION_MOVE:
 151             return wxDragMove;
 152     }
 153
 154     return wxDragNone;
 155 }
 156
 157 // ----------------------------------------------------------------------------
 158 // "drag_leave"
 159 // ----------------------------------------------------------------------------
 160
 161 extern "C" {
 162 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 163                                GdkDragContext *context,
 164                                guint WXUNUSED(time),
 165                                wxDropTarget *drop_target )
 166 {
 167     if (g_isIdle) wxapp_install_idle_handler();
 168
 169     /* inform the wxDropTarget about the current GdkDragContext.
 170        this is only valid for the duration of this call */
 171     drop_target->SetDragContext( context );
 172
 173     /* we don't need return values. this event is just for
 174        information */
 175     drop_target->OnLeave();
 176
 177     /* this has to be done because GDK has no "drag_enter" event */
 178     drop_target->m_firstMotion = true;
 179
 180     /* after this, invalidate the drop_target's GdkDragContext */
 181     drop_target->SetDragContext( (GdkDragContext*) NULL );
 182 }
 183 }
 184
 185 // ----------------------------------------------------------------------------
 186 // "drag_motion"
 187 // ----------------------------------------------------------------------------
 188
 189 extern "C" {
 190 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 191                                     GdkDragContext *context,
 192                                     gint x,
 193                                     gint y,
 194                                     guint time,
 195                                     wxDropTarget *drop_target )
 196 {
 197     if (g_isIdle) wxapp_install_idle_handler();
 198
 199     /* Owen Taylor: "if the coordinates not in a drop zone,
 200        return FALSE, otherwise call gtk_drag_status() and
 201        return TRUE" */
 202
 203     /* inform the wxDropTarget about the current GdkDragContext.
 204        this is only valid for the duration of this call */
 205     drop_target->SetDragContext( context );
 206
 207     // GTK+ always supposes that we want to copy the data by default while we
 208     // might want to move it, so examine not only suggested_action - which is
 209     // only good if we don't have our own preferences - but also the actions
 210     // field
 211     wxDragResult result;
 212     if (drop_target->GetDefaultAction() == wxDragNone)
 213     {
 214         // use default action set by wxDropSource::DoDragDrop()
 215     if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 216             (context->actions & GDK_ACTION_MOVE ) )
 217     {
 218         // move is requested by the program and allowed by GTK+ - do it, even
 219         // though suggested_action may be currently wxDragCopy
 220         result = wxDragMove;
 221     }
 222     else // use whatever GTK+ says we should
 223     {
 224         result = ConvertFromGTK(context->suggested_action);
 225
 226         if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 227         {
 228             // we're requested to move but we can't
 229             result = wxDragCopy;
 230         }
 231     }
 232     }
 233     else if (drop_target->GetDefaultAction() == wxDragMove &&
 234                 (context->actions & GDK_ACTION_MOVE))
 235     {
 236        result = wxDragMove;
 237     }
 238     else
 239     {
 240         if (context->actions & GDK_ACTION_COPY)
 241             result = wxDragCopy;
 242         else if (context->actions & GDK_ACTION_MOVE)
 243             result = wxDragMove;
 244         else
 245             result = wxDragNone;
 246     }
 247
 248     if (drop_target->m_firstMotion)
 249     {
 250         /* the first "drag_motion" event substitutes a "drag_enter" event */
 251         result = drop_target->OnEnter( x, y, result );
 252     }
 253     else
 254     {
 255         /* give program a chance to react (i.e. to say no by returning FALSE) */
 256         result = drop_target->OnDragOver( x, y, result );
 257     }
 258
 259     bool ret = wxIsDragResultOk( result );
 260     if (ret)
 261     {
 262         GdkDragAction action;
 263         if (result == wxDragCopy)
 264             action = GDK_ACTION_COPY;
 265         else if (result == wxDragLink)
 266             action = GDK_ACTION_LINK;
 267         else
 268             action = GDK_ACTION_MOVE;
 269
 270         gdk_drag_status( context, action, time );
 271     }
 272
 273     /* after this, invalidate the drop_target's GdkDragContext */
 274     drop_target->SetDragContext( (GdkDragContext*) NULL );
 275
 276     /* this has to be done because GDK has no "drag_enter" event */
 277     drop_target->m_firstMotion = false;
 278
 279     return ret;
 280 }
 281 }
 282
 283 // ----------------------------------------------------------------------------
 284 // "drag_drop"
 285 // ----------------------------------------------------------------------------
 286
 287 extern "C" {
 288 static gboolean target_drag_drop( GtkWidget *widget,
 289                                   GdkDragContext *context,
 290                                   gint x,
 291                                   gint y,
 292                                   guint time,
 293                                   wxDropTarget *drop_target )
 294 {
 295     if (g_isIdle) wxapp_install_idle_handler();
 296
 297     /* Owen Taylor: "if the drop is not in a drop zone,
 298        return FALSE, otherwise, if you aren't accepting
 299        the drop, call gtk_drag_finish() with success == FALSE
 300        otherwise call gtk_drag_data_get()" */
 301
 302 //    printf( "drop.\n" );
 303
 304     /* this seems to make a difference between not accepting
 305        due to wrong target area and due to wrong format. let
 306        us hope that this is not required.. */
 307
 308     /* inform the wxDropTarget about the current GdkDragContext.
 309        this is only valid for the duration of this call */
 310     drop_target->SetDragContext( context );
 311
 312     /* inform the wxDropTarget about the current drag widget.
 313        this is only valid for the duration of this call */
 314     drop_target->SetDragWidget( widget );
 315
 316     /* inform the wxDropTarget about the current drag time.
 317        this is only valid for the duration of this call */
 318     drop_target->SetDragTime( time );
 319
 320 /*
 321     wxDragResult result = wxDragMove;
 322     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 323 */
 324
 325     /* reset the block here as someone might very well
 326        show a dialog as a reaction to a drop and this
 327        wouldn't work without events */
 328     g_blockEventsOnDrag = false;
 329
 330     bool ret = drop_target->OnDrop( x, y );
 331
 332     if (!ret)
 333     {
 334         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 335
 336         /* cancel the whole thing */
 337         gtk_drag_finish( context,
 338                           FALSE,        /* no success */
 339                           FALSE,        /* don't delete data on dropping side */
 340                           time );
 341     }
 342     else
 343     {
 344         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned true") );
 345
 346 #if wxUSE_THREADS
 347         /* disable GUI threads */
 348 #endif
 349
 350         GdkAtom format = drop_target->GetMatchingPair();
 351
 352         // this does happen somehow, see bug 555111
 353         wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") );
 354
 355 /*
 356         GdkDragAction action = GDK_ACTION_MOVE;
 357         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 358         context->action = action;
 359 */
 360         /* this should trigger an "drag_data_received" event */
 361         gtk_drag_get_data( widget,
 362                            context,
 363                            format,
 364                            time );
 365
 366 #if wxUSE_THREADS
 367         /* re-enable GUI threads */
 368 #endif
 369     }
 370
 371     /* after this, invalidate the drop_target's GdkDragContext */
 372     drop_target->SetDragContext( (GdkDragContext*) NULL );
 373
 374     /* after this, invalidate the drop_target's drag widget */
 375     drop_target->SetDragWidget( (GtkWidget*) NULL );
 376
 377     /* this has to be done because GDK has no "drag_enter" event */
 378     drop_target->m_firstMotion = true;
 379
 380     return ret;
 381 }
 382 }
 383
 384 // ----------------------------------------------------------------------------
 385 // "drag_data_received"
 386 // ----------------------------------------------------------------------------
 387
 388 extern "C" {
 389 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 390                                        GdkDragContext *context,
 391                                        gint x,
 392                                        gint y,
 393                                        GtkSelectionData *data,
 394                                        guint WXUNUSED(info),
 395                                        guint time,
 396                                        wxDropTarget *drop_target )
 397 {
 398     if (g_isIdle) wxapp_install_idle_handler();
 399
 400     /* Owen Taylor: "call gtk_drag_finish() with
 401        success == TRUE" */
 402
 403     if ((data->length <= 0) || (data->format != 8))
 404     {
 405         /* negative data length and non 8-bit data format
 406            qualifies for junk */
 407         gtk_drag_finish (context, FALSE, FALSE, time);
 408
 409         return;
 410     }
 411
 412     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 413
 414     /* inform the wxDropTarget about the current GtkSelectionData.
 415        this is only valid for the duration of this call */
 416     drop_target->SetDragData( data );
 417
 418     wxDragResult result = ConvertFromGTK(context->action);
 419
 420     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 421     {
 422         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned true") );
 423
 424         /* tell GTK that data transfer was successful */
 425         gtk_drag_finish( context, TRUE, FALSE, time );
 426     }
 427     else
 428     {
 429         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 430
 431         /* tell GTK that data transfer was not successful */
 432         gtk_drag_finish( context, FALSE, FALSE, time );
 433     }
 434
 435     /* after this, invalidate the drop_target's drag data */
 436     drop_target->SetDragData( (GtkSelectionData*) NULL );
 437 }
 438 }
 439
 440 //----------------------------------------------------------------------------
 441 // wxDropTarget
 442 //----------------------------------------------------------------------------
 443
 444 wxDropTarget::wxDropTarget( wxDataObject *data )
 445             : wxDropTargetBase( data )
 446 {
 447     m_firstMotion = true;
 448     m_dragContext = (GdkDragContext*) NULL;
 449     m_dragWidget = (GtkWidget*) NULL;
 450     m_dragData = (GtkSelectionData*) NULL;
 451     m_dragTime = 0;
 452 }
 453
 454 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 455                                        wxCoord WXUNUSED(y),
 456                                        wxDragResult def )
 457 {
 458     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 459
 460     // disable the debug message from GetMatchingPair() - there are too many
 461     // of them otherwise
 462 #ifdef __WXDEBUG__
 463     wxLogNull noLog;
 464 #endif // Debug
 465
 466     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 467 }
 468
 469 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 470 {
 471     if (!m_dataObject)
 472         return false;
 473
 474     return (GetMatchingPair() != (GdkAtom) 0);
 475 }
 476
 477 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 478                                    wxDragResult def )
 479 {
 480     if (!m_dataObject)
 481         return wxDragNone;
 482
 483     if (GetMatchingPair() == (GdkAtom) 0)
 484         return wxDragNone;
 485
 486     return GetData() ? def : wxDragNone;
 487 }
 488
 489 GdkAtom wxDropTarget::GetMatchingPair()
 490 {
 491     if (!m_dataObject)
 492         return (GdkAtom) 0;
 493
 494     if (!m_dragContext)
 495         return (GdkAtom) 0;
 496
 497     GList *child = m_dragContext->targets;
 498     while (child)
 499     {
 500         GdkAtom formatAtom = (GdkAtom)(child->data);
 501         wxDataFormat format( formatAtom );
 502
 503 #ifdef __WXDEBUG__
 504         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 505                    format.GetId().c_str());
 506 #endif // Debug
 507
 508         if (m_dataObject->IsSupportedFormat( format ))
 509             return formatAtom;
 510
 511         child = child->next;
 512     }
 513
 514     return (GdkAtom) 0;
 515 }
 516
 517 bool wxDropTarget::GetData()
 518 {
 519     if (!m_dragData)
 520         return false;
 521
 522     if (!m_dataObject)
 523         return false;
 524
 525     wxDataFormat dragFormat( m_dragData->target );
 526
 527     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 528         return false;
 529
 530     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 531
 532     return true;
 533 }
 534
 535 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 536 {
 537     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 538
 539     gtk_drag_dest_unset( widget );
 540
 541     g_signal_handlers_disconnect_by_func (widget,
 542                                           (gpointer) target_drag_leave, this);
 543     g_signal_handlers_disconnect_by_func (widget,
 544                                           (gpointer) target_drag_motion, this);
 545     g_signal_handlers_disconnect_by_func (widget,
 546                                           (gpointer) target_drag_drop, this);
 547     g_signal_handlers_disconnect_by_func (widget,
 548                                           (gpointer) target_drag_data_received, this);
 549 }
 550
 551 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 552 {
 553     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 554
 555     /* gtk_drag_dest_set() determines what default behaviour we'd like
 556        GTK to supply. we don't want to specify out targets (=formats)
 557        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 558        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 559        "drag_motion" and "drag_drop" events. this makes it possible
 560        to allow dropping on only a small area. we should set
 561        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 562        highlighting if dragging over standard controls, but this
 563        seems to be broken without the other two. */
 564
 565     gtk_drag_dest_set( widget,
 566                        (GtkDestDefaults) 0,         /* no default behaviour */
 567                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 568                        0,                           /* number of targets = 0 */
 569                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 570
 571     g_signal_connect (widget, "drag_leave",
 572                       G_CALLBACK (target_drag_leave), this);
 573
 574     g_signal_connect (widget, "drag_motion",
 575                       G_CALLBACK (target_drag_motion), this);
 576
 577     g_signal_connect (widget, "drag_drop",
 578                       G_CALLBACK (target_drag_drop), this);
 579
 580     g_signal_connect (widget, "drag_data_received",
 581                       G_CALLBACK (target_drag_data_received), this);
 582 }
 583
 584 //----------------------------------------------------------------------------
 585 // "drag_data_get"
 586 //----------------------------------------------------------------------------
 587
 588 extern "C" {
 589 static void
 590 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 591                        GdkDragContext     *WXUNUSED(context),
 592                        GtkSelectionData   *selection_data,
 593                        guint               WXUNUSED(info),
 594                        guint               WXUNUSED(time),
 595                        wxDropSource       *drop_source )
 596 {
 597     if (g_isIdle) wxapp_install_idle_handler();
 598
 599     wxDataFormat format( selection_data->target );
 600
 601     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 602                format.GetId().c_str());
 603
 604     drop_source->m_retValue = wxDragCancel;
 605
 606     wxDataObject *data = drop_source->GetDataObject();
 607
 608     if (!data)
 609     {
 610         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 611         return;
 612     }
 613
 614     if (!data->IsSupportedFormat(format))
 615     {
 616         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 617         return;
 618     }
 619
 620     if (data->GetDataSize(format) == 0)
 621     {
 622         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 623         return;
 624     }
 625
 626     size_t size = data->GetDataSize(format);
 627
 628 //  printf( "data size: %d.\n", (int)data_size );
 629
 630     guchar *d = new guchar[size];
 631
 632     if (!data->GetDataHere( format, (void*)d ))
 633     {
 634         delete[] d;
 635         return;
 636     }
 637
 638 #if wxUSE_THREADS
 639     /* disable GUI threads */
 640 #endif
 641
 642     gtk_selection_data_set( selection_data,
 643                             selection_data->target,
 644                             8,   // 8-bit
 645                             d,
 646                             size );
 647
 648 #if wxUSE_THREADS
 649     /* enable GUI threads */
 650 #endif
 651
 652     delete[] d;
 653 }
 654 }
 655
 656 //----------------------------------------------------------------------------
 657 // "drag_data_delete"
 658 //----------------------------------------------------------------------------
 659
 660 extern "C" {
 661 static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
 662                                      GdkDragContext *WXUNUSED(context),
 663                                      wxDropSource *WXUNUSED(drop_source) )
 664 {
 665     if (g_isIdle)
 666         wxapp_install_idle_handler();
 667
 668     // printf( "Drag source: drag_data_delete\n" );
 669 }
 670 }
 671
 672 //----------------------------------------------------------------------------
 673 // "drag_begin"
 674 //----------------------------------------------------------------------------
 675
 676 extern "C" {
 677 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 678                                GdkDragContext     *WXUNUSED(context),
 679                                wxDropSource       *WXUNUSED(drop_source) )
 680 {
 681     if (g_isIdle)
 682         wxapp_install_idle_handler();
 683
 684     // printf( "Drag source: drag_begin.\n" );
 685 }
 686 }
 687
 688 //----------------------------------------------------------------------------
 689 // "drag_end"
 690 //----------------------------------------------------------------------------
 691
 692 extern "C" {
 693 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 694                              GdkDragContext     *WXUNUSED(context),
 695                              wxDropSource       *drop_source )
 696 {
 697     if (g_isIdle) wxapp_install_idle_handler();
 698
 699     // printf( "Drag source: drag_end.\n" );
 700
 701     drop_source->m_waiting = false;
 702 }
 703 }
 704
 705 //-----------------------------------------------------------------------------
 706 // "configure_event" from m_iconWindow
 707 //-----------------------------------------------------------------------------
 708
 709 extern "C" {
 710 static gint
 711 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 712 {
 713     // don't need to install idle handler, its done from "event" signal
 714
 715     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 716
 717     return 0;
 718 }
 719 }
 720
 721 //---------------------------------------------------------------------------
 722 // wxDropSource
 723 //---------------------------------------------------------------------------
 724
 725 wxDropSource::wxDropSource(wxWindow *win,
 726                            const wxIcon &iconCopy,
 727                            const wxIcon &iconMove,
 728                            const wxIcon &iconNone)
 729 {
 730     m_waiting = true;
 731
 732     m_iconWindow = (GtkWidget*) NULL;
 733
 734     m_window = win;
 735     m_widget = win->m_widget;
 736     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 737
 738     m_retValue = wxDragCancel;
 739
 740     SetIcons(iconCopy, iconMove, iconNone);
 741 }
 742
 743 wxDropSource::wxDropSource(wxDataObject& data,
 744                            wxWindow *win,
 745                            const wxIcon &iconCopy,
 746                            const wxIcon &iconMove,
 747                            const wxIcon &iconNone)
 748 {
 749     m_waiting = true;
 750
 751     SetData( data );
 752
 753     m_iconWindow = (GtkWidget*) NULL;
 754
 755     m_window = win;
 756     m_widget = win->m_widget;
 757     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 758
 759     m_retValue = wxDragCancel;
 760
 761     SetIcons(iconCopy, iconMove, iconNone);
 762 }
 763
 764 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 765                             const wxIcon &iconMove,
 766                             const wxIcon &iconNone)
 767 {
 768     m_iconCopy = iconCopy;
 769     m_iconMove = iconMove;
 770     m_iconNone = iconNone;
 771
 772     if ( !m_iconCopy.Ok() )
 773         m_iconCopy = wxIcon(page_xpm);
 774     if ( !m_iconMove.Ok() )
 775         m_iconMove = m_iconCopy;
 776     if ( !m_iconNone.Ok() )
 777         m_iconNone = m_iconCopy;
 778 }
 779
 780 wxDropSource::~wxDropSource()
 781 {
 782 }
 783
 784 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 785 {
 786     // get the right icon to display
 787     wxIcon *icon = NULL;
 788     if ( action & GDK_ACTION_MOVE )
 789         icon = &m_iconMove;
 790     else if ( action & GDK_ACTION_COPY )
 791         icon = &m_iconCopy;
 792     else
 793         icon = &m_iconNone;
 794
 795     GdkBitmap *mask;
 796     if ( icon->GetMask() )
 797         mask = icon->GetMask()->GetBitmap();
 798     else
 799         mask = (GdkBitmap *)NULL;
 800
 801     GdkPixmap *pixmap = icon->GetPixmap();
 802
 803     gint width,height;
 804     gdk_drawable_get_size (pixmap, &width, &height);
 805
 806     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 807     gtk_widget_push_colormap (colormap);
 808
 809     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 810     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 811     gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
 812
 813     gtk_widget_pop_colormap ();
 814
 815     gtk_widget_set_size_request (m_iconWindow, width, height);
 816     gtk_widget_realize (m_iconWindow);
 817
 818     g_signal_connect (m_iconWindow, "configure_event",
 819                       G_CALLBACK (gtk_dnd_window_configure_callback), this);
 820
 821     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 822
 823     if (mask)
 824         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 825
 826     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 827 }
 828
 829 wxDragResult wxDropSource::DoDragDrop(int flags)
 830 {
 831     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 832                  wxT("Drop source: no data") );
 833
 834     // still in drag
 835     if (g_blockEventsOnDrag)
 836         return wxDragNone;
 837
 838     // disabled for now
 839     g_blockEventsOnDrag = true;
 840
 841     RegisterWindow();
 842
 843     m_waiting = true;
 844
 845     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 846
 847     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 848     m_data->GetAllFormats( array );
 849     size_t count = m_data->GetFormatCount();
 850     for (size_t i = 0; i < count; i++)
 851     {
 852         GdkAtom atom = array[i];
 853         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 854         gtk_target_list_add( target_list, atom, 0, 0 );
 855     }
 856     delete[] array;
 857
 858     /* don't start dragging if no button is down */
 859     if (g_lastButtonNumber)
 860     {
 861         int action = GDK_ACTION_COPY;
 862         if ( flags & wxDrag_AllowMove )
 863             action |= GDK_ACTION_MOVE;
 864
 865         // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 866         //     to use a global to pass the flags to the drop target but I'd
 867         //     surely prefer a better way to do it
 868         gs_flagsForDrag = flags;
 869
 870         GdkDragContext *context = gtk_drag_begin( m_widget,
 871                 target_list,
 872                 (GdkDragAction)action,
 873                 g_lastButtonNumber,  // number of mouse button which started drag
 874                 (GdkEvent*) g_lastMouseEvent );
 875
 876         m_dragContext = context;
 877
 878         PrepareIcon( action, context );
 879
 880         while (m_waiting)
 881             gtk_main_iteration();
 882
 883         m_retValue = ConvertFromGTK(context->action);
 884         if ( m_retValue == wxDragNone )
 885             m_retValue = wxDragCancel;
 886     }
 887
 888     g_blockEventsOnDrag = false;
 889
 890     UnregisterWindow();
 891
 892     return m_retValue;
 893 }
 894
 895 void wxDropSource::RegisterWindow()
 896 {
 897     if (!m_widget) return;
 898
 899     g_signal_connect (m_widget, "drag_data_get",
 900                       G_CALLBACK (source_drag_data_get), this);
 901     g_signal_connect (m_widget, "drag_data_delete",
 902                       G_CALLBACK (source_drag_data_delete), this);
 903     g_signal_connect (m_widget, "drag_begin",
 904                       G_CALLBACK (source_drag_begin), this);
 905     g_signal_connect (m_widget, "drag_end",
 906                       G_CALLBACK (source_drag_end), this);
 907
 908 }
 909
 910 void wxDropSource::UnregisterWindow()
 911 {
 912     if (!m_widget)
 913         return;
 914
 915     g_signal_handlers_disconnect_by_func (m_widget,
 916                                           (gpointer) source_drag_data_get,
 917                                           this);
 918     g_signal_handlers_disconnect_by_func (m_widget,
 919                                           (gpointer) source_drag_data_delete,
 920                                           this);
 921     g_signal_handlers_disconnect_by_func (m_widget,
 922                                           (gpointer) source_drag_begin,
 923                                           this);
 924     g_signal_handlers_disconnect_by_func (m_widget,
 925                                           (gpointer) source_drag_end,
 926                                           this);
 927 }
 928
 929 #endif
 930       // wxUSE_DRAG_AND_DROP