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 #ifdef __GNUG__
  11 #pragma implementation "dnd.h"
  12 #endif
  13
  14 #include "wx/dnd.h"
  15
  16 #if wxUSE_DRAG_AND_DROP
  17
  18 #include "wx/window.h"
  19 #include "wx/app.h"
  20 #include "wx/gdicmn.h"
  21 #include "wx/intl.h"
  22 #include "wx/utils.h"
  23
  24 #include "gdk/gdk.h"
  25 #include "gtk/gtk.h"
  26 #include "gdk/gdkprivate.h"
  27
  28 #include "gtk/gtkdnd.h"
  29 #include "gtk/gtkselection.h"
  30
  31 //-----------------------------------------------------------------------------
  32 // idle system
  33 //-----------------------------------------------------------------------------
  34
  35 extern void wxapp_install_idle_handler();
  36 extern bool g_isIdle;
  37
  38 //-----------------------------------------------------------------------------
  39 // thread system
  40 //-----------------------------------------------------------------------------
  41
  42 #if wxUSE_THREADS
  43 extern void wxapp_install_thread_wakeup();
  44 extern void wxapp_uninstall_thread_wakeup();
  45 #endif
  46
  47 //----------------------------------------------------------------------------
  48 // global data
  49 //----------------------------------------------------------------------------
  50
  51 extern bool g_blockEventsOnDrag;
  52
  53 //----------------------------------------------------------------------------
  54 // standard icons
  55 //----------------------------------------------------------------------------
  56
  57 /* XPM */
  58 static char * gv_xpm[] = {
  59 "40 34 3 1",
  60 "         s None c None",
  61 ".        c black",
  62 "X        c white",
  63 "                                        ",
  64 "                                        ",
  65 "                  ......                ",
  66 "                ..XXXXXX..              ",
  67 "               .XXXXXXXXXX.             ",
  68 "              .XXXXXXXXXXXX.            ",
  69 "              .XXXXXXXXXXXX.            ",
  70 "             .XXXXXXXXXXXXXX.           ",
  71 "             .XXX..XXXX..XXX.           ",
  72 "          ....XX....XX....XX.           ",
  73 "         .XXX.XXX..XXXX..XXX....        ",
  74 "        .XXXXXXXXXXXXXXXXXXX.XXX.       ",
  75 "        .XXXXXXXXXXXXXXXXXXXXXXXX.      ",
  76 "        .XXXXXXXXXXXXXXXXXXXXXXXX.      ",
  77 "         ..XXXXXXXXXXXXXXXXXXXXXX.      ",
  78 "           .XXXXXXXXXXXXXXXXXX...       ",
  79 "           ..XXXXXXXXXXXXXXXX.          ",
  80 "            .XXXXXXXXXXXXXXXX.          ",
  81 "            .XXXXXXXXXXXXXXXX.          ",
  82 "            .XXXXXXXXXXXXXXXXX.         ",
  83 "            .XXXXXXXXXXXXXXXXX.         ",
  84 "            .XXXXXXXXXXXXXXXXXX.        ",
  85 "            .XXXXXXXXXXXXXXXXXXX.       ",
  86 "           .XXXXXXXXXXXXXXXXXXXXX.      ",
  87 "           .XXXXXXXXXXXXXX.XXXXXXX.     ",
  88 "          .XXXXXXX.XXXXXXX.XXXXXXX.     ",
  89 "         .XXXXXXXX.XXXXXXX.XXXXXXX.     ",
  90 "         .XXXXXXX...XXXXX...XXXXX.      ",
  91 "         .XXXXXXX.  .....   .....       ",
  92 "         ..XXXX..                       ",
  93 "           ....                         ",
  94 "                                        ",
  95 "                                        ",
  96 "                                        "};
  97
  98 /* XPM */
  99 static char * page_xpm[] = {
 100 /* width height ncolors chars_per_pixel */
 101 "32 32 5 1",
 102 /* colors */
 103 "         s None        c None",
 104 ".        c black",
 105 "X        c wheat",
 106 "o        c tan",
 107 "O        c #6699FF",
 108 /* pixels */
 109 "    ...................         ",
 110 "    .XXXXXXXXXXXXXXXXX..        ",
 111 "    .XXXXXXXXXXXXXXXXX.o.       ",
 112 "    .XXXXXXXXXXXXXXXXX.oo.      ",
 113 "    .XXXXXXXXXXXXXXXXX.ooo.     ",
 114 "    .XXXXXXXXXXXXXXXXX.oooo.    ",
 115 "    .XXXXXXXXXXXXXXXXX.......   ",
 116 "    .XXXXXOOOOOOOOOOXXXooooo.   ",
 117 "    .XXXXXXXXXXXXXXXXXXooooo.   ",
 118 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 119 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 120 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
 121 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 122 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 123 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 124 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 125 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 126 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
 127 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 128 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 129 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 130 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 131 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 132 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 133 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 134 "    .XXXXXOOOOOOOXXXXXXXXXXX.   ",
 135 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 136 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 137 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 138 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 139 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 140 "    .........................   "};
 141
 142
 143
 144 // ----------------------------------------------------------------------------
 145 // "drag_leave"
 146 // ----------------------------------------------------------------------------
 147
 148 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 149                                GdkDragContext *context,
 150                                guint WXUNUSED(time),
 151                                wxDropTarget *drop_target )
 152 {
 153     if (g_isIdle) wxapp_install_idle_handler();
 154
 155     /* inform the wxDropTarget about the current GdkDragContext.
 156        this is only valid for the duration of this call */
 157     drop_target->SetDragContext( context );
 158
 159     /* we don't need return values. this event is just for
 160        information */
 161     drop_target->OnLeave();
 162
 163     /* this has to be done because GDK has no "drag_enter" event */
 164     drop_target->m_firstMotion = TRUE;
 165
 166     /* after this, invalidate the drop_target's GdkDragContext */
 167     drop_target->SetDragContext( (GdkDragContext*) NULL );
 168 }
 169
 170 // ----------------------------------------------------------------------------
 171 // "drag_motion"
 172 // ----------------------------------------------------------------------------
 173
 174 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 175                                     GdkDragContext *context,
 176                                     gint x,
 177                                     gint y,
 178                                     guint time,
 179                                     wxDropTarget *drop_target )
 180 {
 181     if (g_isIdle) wxapp_install_idle_handler();
 182
 183     /* Owen Taylor: "if the coordinates not in a drop zone,
 184        return FALSE, otherwise call gtk_drag_status() and
 185        return TRUE" */
 186
 187     /* inform the wxDropTarget about the current GdkDragContext.
 188        this is only valid for the duration of this call */
 189     drop_target->SetDragContext( context );
 190
 191     bool ret = FALSE;
 192
 193     if (drop_target->m_firstMotion)
 194     {
 195         /* the first "drag_motion" event substitutes a "drag_enter" event */
 196         ret = drop_target->OnEnter( x, y );
 197     }
 198     else
 199     {
 200         /* give program a chance to react (i.e. to say no by returning FALSE) */
 201         ret = drop_target->OnMove( x, y );
 202     }
 203
 204     /* we don't yet handle which "actions" (i.e. copy or move)
 205        the target accepts. so far we simply accept the
 206        suggested action. TODO. */
 207     if (ret)
 208         gdk_drag_status( context, context->suggested_action, time );
 209
 210     /* after this, invalidate the drop_target's GdkDragContext */
 211     drop_target->SetDragContext( (GdkDragContext*) NULL );
 212
 213     /* this has to be done because GDK has no "drag_enter" event */
 214     drop_target->m_firstMotion = FALSE;
 215
 216     return ret;
 217 }
 218
 219 // ----------------------------------------------------------------------------
 220 // "drag_drop"
 221 // ----------------------------------------------------------------------------
 222
 223 static gboolean target_drag_drop( GtkWidget *widget,
 224                                   GdkDragContext *context,
 225                                   gint x,
 226                                   gint y,
 227                                   guint time,
 228                                   wxDropTarget *drop_target )
 229 {
 230     if (g_isIdle) wxapp_install_idle_handler();
 231
 232     /* Owen Taylor: "if the drop is not in a drop zone,
 233        return FALSE, otherwise, if you aren't accepting
 234        the drop, call gtk_drag_finish() with success == FALSE
 235        otherwise call gtk_drag_data_get()" */
 236
 237 //    printf( "drop.\n" );
 238
 239     /* this seems to make a difference between not accepting
 240        due to wrong target area and due to wrong format. let
 241        us hope that this is not required.. */
 242
 243     /* inform the wxDropTarget about the current GdkDragContext.
 244        this is only valid for the duration of this call */
 245     drop_target->SetDragContext( context );
 246
 247     /* inform the wxDropTarget about the current drag widget.
 248        this is only valid for the duration of this call */
 249     drop_target->SetDragWidget( widget );
 250
 251     /* inform the wxDropTarget about the current drag time.
 252        this is only valid for the duration of this call */
 253     drop_target->SetDragTime( time );
 254
 255     bool ret = drop_target->OnDrop( x, y );
 256
 257     if (!ret)
 258     {
 259         /* cancel the whole thing */
 260         gtk_drag_finish( context,
 261                           FALSE,        /* no success */
 262                           FALSE,        /* don't delete data on dropping side */
 263                           time );
 264     }
 265     else
 266     {
 267 #if wxUSE_THREADS
 268         /* disable GUI threads */
 269         wxapp_uninstall_thread_wakeup();
 270 #endif
 271
 272         GdkAtom format = drop_target->GetMatchingPair();
 273         wxASSERT( format );
 274
 275         /* this should trigger an "drag_data_received" event */
 276         gtk_drag_get_data( widget,
 277                            context,
 278                            format,
 279                            time );
 280
 281 #if wxUSE_THREADS
 282         /* re-enable GUI threads */
 283         wxapp_install_thread_wakeup();
 284 #endif
 285     }
 286
 287     /* after this, invalidate the drop_target's GdkDragContext */
 288     drop_target->SetDragContext( (GdkDragContext*) NULL );
 289
 290     /* after this, invalidate the drop_target's drag widget */
 291     drop_target->SetDragWidget( (GtkWidget*) NULL );
 292
 293     /* this has to be done because GDK has no "drag_enter" event */
 294     drop_target->m_firstMotion = TRUE;
 295
 296     return ret;
 297 }
 298
 299 // ----------------------------------------------------------------------------
 300 // "drag_data_received"
 301 // ----------------------------------------------------------------------------
 302
 303 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 304                                        GdkDragContext *context,
 305                                        gint x,
 306                                        gint y,
 307                                        GtkSelectionData *data,
 308                                        guint WXUNUSED(info),
 309                                        guint time,
 310                                        wxDropTarget *drop_target )
 311 {
 312     if (g_isIdle) wxapp_install_idle_handler();
 313
 314     /* Owen Taylor: "call gtk_drag_finish() with
 315        success == TRUE" */
 316
 317
 318     if ((data->length <= 0) || (data->format != 8))
 319     {
 320         /* negative data length and non 8-bit data format
 321            qualifies for junk */
 322         gtk_drag_finish (context, FALSE, FALSE, time);
 323
 324         return;
 325     }
 326
 327     wxLogDebug( wxT( "Drop target: data received") );
 328
 329     /* inform the wxDropTarget about the current GtkSelectionData.
 330        this is only valid for the duration of this call */
 331     drop_target->SetDragData( data );
 332
 333     if (drop_target->OnData( x, y ))
 334     {
 335         /* tell GTK that data transfer was successfull */
 336         gtk_drag_finish( context, TRUE, FALSE, time );
 337     }
 338     else
 339     {
 340         /* tell GTK that data transfer was not successfull */
 341         gtk_drag_finish( context, FALSE, FALSE, time );
 342     }
 343
 344     /* after this, invalidate the drop_target's drag data */
 345     drop_target->SetDragData( (GtkSelectionData*) NULL );
 346 }
 347
 348 //----------------------------------------------------------------------------
 349 // wxDropTarget
 350 //----------------------------------------------------------------------------
 351
 352 wxDropTarget::wxDropTarget( wxDataObject *data )
 353   : wxDropTargetBase( data )
 354 {
 355     m_firstMotion = TRUE;
 356     m_dragContext = (GdkDragContext*) NULL;
 357     m_dragWidget = (GtkWidget*) NULL;
 358     m_dragData = (GtkSelectionData*) NULL;
 359     m_dragTime = 0;
 360 }
 361
 362 bool wxDropTarget::OnEnter( int WXUNUSED(x), int WXUNUSED(y) )
 363 {
 364     if (!m_dataObject)
 365         return FALSE;
 366
 367     return (GetMatchingPair() != (GdkAtom) 0);
 368 }
 369
 370 bool wxDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) )
 371 {
 372     if (!m_dataObject)
 373         return FALSE;
 374
 375     return (GetMatchingPair() != (GdkAtom) 0);
 376 }
 377
 378 bool wxDropTarget::OnDrop( int WXUNUSED(x), int WXUNUSED(y) )
 379 {
 380     if (!m_dataObject)
 381         return FALSE;
 382
 383     return (GetMatchingPair() != (GdkAtom) 0);
 384 }
 385
 386 bool wxDropTarget::OnData( int WXUNUSED(x), int WXUNUSED(y) )
 387 {
 388     if (!m_dataObject)
 389         return FALSE;
 390
 391     if (GetMatchingPair() == (GdkAtom) 0)
 392         return FALSE;
 393
 394     return GetData();
 395 }
 396
 397 GdkAtom wxDropTarget::GetMatchingPair()
 398 {
 399     if (!m_dataObject)
 400         return (GdkAtom) 0;
 401
 402     if (!m_dragContext)
 403         return (GdkAtom) 0;
 404
 405     GList *child = m_dragContext->targets;
 406     while (child)
 407     {
 408         GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
 409         wxDataFormat format( formatAtom );
 410
 411 #ifdef __WXDEBUG__
 412         char *name = gdk_atom_name( formatAtom );
 413         if (name) wxLogDebug( "Drop target: drag has format: %s", name );
 414 #endif
 415         if (m_dataObject->IsSupportedFormat( format ))
 416             return formatAtom;
 417
 418         child = child->next;
 419     }
 420
 421     return (GdkAtom) 0;
 422 }
 423
 424 bool wxDropTarget::GetData()
 425 {
 426     if (!m_dragData)
 427         return FALSE;
 428
 429     if (!m_dataObject)
 430         return FALSE;
 431
 432     wxDataFormat dragFormat( m_dragData->target );
 433
 434     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 435         return FALSE;
 436
 437     if (dragFormat.GetType() == wxDF_TEXT)
 438     {
 439         wxTextDataObject *text_object = (wxTextDataObject*)m_dataObject;
 440         text_object->SetText( (const char*)m_dragData->data );
 441         return TRUE;
 442     }
 443
 444     if (dragFormat.GetType() == wxDF_FILENAME)
 445     {
 446         wxFileDataObject *file_object = (wxFileDataObject*)m_dataObject;
 447         file_object->SetData( 0, (const char*)m_dragData->data );
 448         return TRUE;
 449     }
 450
 451     return FALSE;
 452 }
 453
 454 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 455 {
 456     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 457
 458     gtk_drag_dest_unset( widget );
 459
 460     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 461                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 462
 463     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 464                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 465
 466     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 467                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 468
 469     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 470                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 471 }
 472
 473 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 474 {
 475     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 476
 477     /* gtk_drag_dest_set() determines what default behaviour we'd like
 478        GTK to supply. we don't want to specify out targets (=formats)
 479        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 480        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 481        "drag_motion" and "drag_drop" events. this makes it possible
 482        to allow dropping on only a small area. we should set
 483        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 484        highlighting if dragging over standard controls, but this
 485        seems to be broken without the other two. */
 486
 487     gtk_drag_dest_set( widget,
 488                        (GtkDestDefaults) 0,         /* no default behaviour */
 489                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 490                        0,                           /* number of targets = 0 */
 491                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 492
 493     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 494                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 495
 496     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 497                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 498
 499     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 500                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 501
 502     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 503                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 504 }
 505
 506 //----------------------------------------------------------------------------
 507 // "drag_data_get"
 508 //----------------------------------------------------------------------------
 509
 510 static void
 511 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 512                        GdkDragContext     *context,
 513                        GtkSelectionData   *selection_data,
 514                        guint               WXUNUSED(info),
 515                        guint               WXUNUSED(time),
 516                        wxDropSource       *drop_source )
 517 {
 518     if (g_isIdle) wxapp_install_idle_handler();
 519
 520 #ifdef __WXDEBUG__
 521     char *name = gdk_atom_name( selection_data->target );
 522     if (name) wxLogDebug( wxT("Drop source: format requested: %s"), name );
 523 #endif
 524
 525     drop_source->m_retValue = wxDragCancel;
 526
 527     wxDataObject *data = drop_source->m_data;
 528
 529     if (!data)
 530         return;
 531
 532     if (!data->IsSupportedFormat(selection_data->target))
 533         return;
 534
 535     if (data->GetDataSize(selection_data->target) == 0)
 536         return;
 537
 538     size_t size = data->GetDataSize(selection_data->target);
 539
 540 //  printf( "data size: %d.\n", (int)data_size );
 541
 542     guchar *d = new guchar[size];
 543
 544     if (!data->GetDataHere( selection_data->target, (void*)d ))
 545     {
 546         free( d );
 547         return;
 548     }
 549
 550 #if wxUSE_THREADS
 551     /* disable GUI threads */
 552     wxapp_uninstall_thread_wakeup();
 553 #endif
 554
 555                 gtk_selection_data_set( selection_data,
 556                                         selection_data->target,
 557                                         8,   // 8-bit
 558                                         d,
 559                                         size );
 560
 561 #if wxUSE_THREADS
 562     /* enable GUI threads */
 563     wxapp_install_thread_wakeup();
 564 #endif
 565
 566     free( d );
 567
 568     /* so far only copy, no moves. TODO. */
 569     drop_source->m_retValue = wxDragCopy;
 570 }
 571
 572 //----------------------------------------------------------------------------
 573 // "drag_data_delete"
 574 //----------------------------------------------------------------------------
 575
 576 static void source_drag_data_delete( GtkWidget          *WXUNUSED(widget),
 577                                      GdkDragContext     *WXUNUSED(context),
 578                                      wxDropSource       *drop_source )
 579 {
 580     if (g_isIdle) wxapp_install_idle_handler();
 581
 582 //  printf( "Delete the data!\n" );
 583
 584     drop_source->m_retValue = wxDragMove;
 585 }
 586
 587 //----------------------------------------------------------------------------
 588 // "drag_begin"
 589 //----------------------------------------------------------------------------
 590
 591 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 592                                GdkDragContext     *WXUNUSED(context),
 593                                wxDropSource       *WXUNUSED(drop_source) )
 594 {
 595     if (g_isIdle) wxapp_install_idle_handler();
 596
 597 //  printf( "drag_begin.\n" );
 598 }
 599
 600 //----------------------------------------------------------------------------
 601 // "drag_end"
 602 //----------------------------------------------------------------------------
 603
 604 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 605                              GdkDragContext     *WXUNUSED(context),
 606                              wxDropSource       *drop_source )
 607 {
 608     if (g_isIdle) wxapp_install_idle_handler();
 609
 610 //  printf( "drag_end.\n" );
 611
 612     drop_source->m_waiting = FALSE;
 613 }
 614
 615 //---------------------------------------------------------------------------
 616 // wxDropSource
 617 //---------------------------------------------------------------------------
 618
 619 wxDropSource::wxDropSource( wxWindow *win, const wxIcon &go, const wxIcon &stop )
 620 {
 621     g_blockEventsOnDrag = TRUE;
 622     m_waiting = TRUE;
 623
 624     m_window = win;
 625     m_widget = win->m_widget;
 626     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 627
 628     m_retValue = wxDragCancel;
 629
 630     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 631     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 632
 633     m_goIcon = go;
 634     if (wxNullIcon == go) m_goIcon = wxIcon( page_xpm );
 635     m_stopIcon = stop;
 636     if (wxNullIcon == stop) m_stopIcon = wxIcon( gv_xpm );
 637 }
 638
 639 wxDropSource::wxDropSource( wxDataObject& data, wxWindow *win,
 640                             const wxIcon &go, const wxIcon &stop )
 641 {
 642     m_waiting = TRUE;
 643
 644     SetData( data );
 645
 646     m_window = win;
 647     m_widget = win->m_widget;
 648     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 649     m_retValue = wxDragCancel;
 650
 651     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 652     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 653
 654     m_goIcon = go;
 655     if (wxNullIcon == go) m_goIcon = wxIcon( page_xpm );
 656     m_stopIcon = stop;
 657     if (wxNullIcon == stop) m_stopIcon = wxIcon( gv_xpm );
 658 }
 659
 660 wxDropSource::~wxDropSource()
 661 {
 662     g_blockEventsOnDrag = FALSE;
 663 }
 664
 665 wxDragResult wxDropSource::DoDragDrop( bool WXUNUSED(bAllowMove) )
 666 {
 667     wxASSERT_MSG( m_data, wxT("wxDragSource: no data") );
 668
 669     if (!m_data)
 670         return (wxDragResult) wxDragNone;
 671
 672     if (m_data->GetFormatCount() == 0)
 673         return (wxDragResult) wxDragNone;
 674
 675     g_blockEventsOnDrag = TRUE;
 676
 677     RegisterWindow();
 678
 679     m_waiting = TRUE;
 680
 681     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 682
 683     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 684     m_data->GetAllFormats( array );
 685     for (size_t i = 0; i < m_data->GetFormatCount(); i++)
 686     {
 687         GdkAtom atom = array[i];
 688         wxLogDebug( wxT("Supported atom %s"), gdk_atom_name( atom ) );
 689         gtk_target_list_add( target_list, atom, 0, 0 );
 690     }
 691     delete[] array;
 692
 693     GdkEventMotion event;
 694     event.window = m_widget->window;
 695     int x = 0;
 696     int y = 0;
 697     GdkModifierType state;
 698     gdk_window_get_pointer( event.window, &x, &y, &state );
 699     event.x = x;
 700     event.y = y;
 701     event.state = state;
 702     event.time = GDK_CURRENT_TIME;
 703
 704     /* GTK wants to know which button was pressed which caused the dragging */
 705     int button_number = 0;
 706     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 707     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 708     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 709
 710 #if wxUSE_THREADS
 711     /* disable GUI threads */
 712     wxapp_uninstall_thread_wakeup();
 713 #endif
 714
 715     /* don't start dragging if no button is down */
 716     if (button_number)
 717     {
 718         GdkDragContext *context = gtk_drag_begin( m_widget,
 719                                               target_list,
 720                                               GDK_ACTION_COPY,
 721                                               button_number,  /* number of mouse button which started drag */
 722                                               (GdkEvent*) &event );
 723
 724         wxMask *mask = m_goIcon.GetMask();
 725         GdkBitmap *bm = (GdkBitmap *) NULL;
 726         if (mask) bm = mask->GetBitmap();
 727         GdkPixmap *pm = m_goIcon.GetPixmap();
 728
 729         gtk_drag_set_icon_pixmap( context,
 730                                   gtk_widget_get_colormap( m_widget ),
 731                                   pm,
 732                                   bm,
 733                                   0,
 734                                   0 );
 735
 736         while (m_waiting) gtk_main_iteration();;
 737     }
 738
 739 #if wxUSE_THREADS
 740     /* re-enable GUI threads */
 741     wxapp_install_thread_wakeup();
 742 #endif
 743
 744     g_blockEventsOnDrag = FALSE;
 745
 746     UnregisterWindow();
 747
 748     return m_retValue;
 749 }
 750
 751 void wxDropSource::RegisterWindow()
 752 {
 753     if (!m_widget) return;
 754
 755     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 756                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 757     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 758                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 759     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 760                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 761     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 762                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 763
 764 }
 765
 766 void wxDropSource::UnregisterWindow()
 767 {
 768     if (!m_widget) return;
 769
 770     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 771                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 772     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 773                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 774     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 775                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 776     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 777                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 778 }
 779
 780 #endif
 781
 782       // wxUSE_DRAG_AND_DROP