src/gtk1/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     if (drop_target->m_firstMotion)
 192     {
 193         /* the first "drag_motion" event substitutes a "drag_enter" event */
 194         drop_target->OnEnter();
 195     }
 196
 197     /* give program a chance to react (i.e. to say no by returning FALSE) */
 198     bool ret = drop_target->OnMove( x, y );
 199
 200     /* we don't yet handle which "actions" (i.e. copy or move)
 201        the target accepts. so far we simply accept the
 202        suggested action. TODO. */
 203     if (ret)
 204         gdk_drag_status( context, context->suggested_action, time );
 205
 206     /* after this, invalidate the drop_target's GdkDragContext */
 207     drop_target->SetDragContext( (GdkDragContext*) NULL );
 208
 209     /* this has to be done because GDK has no "drag_enter" event */
 210     drop_target->m_firstMotion = FALSE;
 211
 212     return ret;
 213 }
 214
 215 // ----------------------------------------------------------------------------
 216 // "drag_drop"
 217 // ----------------------------------------------------------------------------
 218
 219 static gboolean target_drag_drop( GtkWidget *widget,
 220                                   GdkDragContext *context,
 221                                   gint x,
 222                                   gint y,
 223                                   guint time,
 224                                   wxDropTarget *drop_target )
 225 {
 226     if (g_isIdle) wxapp_install_idle_handler();
 227
 228     /* Owen Taylor: "if the drop is not in a drop zone,
 229        return FALSE, otherwise, if you aren't accepting
 230        the drop, call gtk_drag_finish() with success == FALSE
 231        otherwise call gtk_drag_data_get()" */
 232
 233 //    printf( "drop.\n" );
 234
 235     /* this seems to make a difference between not accepting
 236        due to wrong target area and due to wrong format. let
 237        us hope that this is not required.. */
 238
 239     /* inform the wxDropTarget about the current GdkDragContext.
 240        this is only valid for the duration of this call */
 241     drop_target->SetDragContext( context );
 242
 243     /* inform the wxDropTarget about the current drag widget.
 244        this is only valid for the duration of this call */
 245     drop_target->SetDragWidget( widget );
 246
 247     /* inform the wxDropTarget about the current drag time.
 248        this is only valid for the duration of this call */
 249     drop_target->SetDragTime( time );
 250
 251     bool ret = drop_target->OnDrop( x, y );
 252
 253     if (!ret)
 254     {
 255         /* cancel the whole thing */
 256         gtk_drag_finish( context,
 257                           FALSE,        /* no success */
 258                           FALSE,        /* don't delete data on dropping side */
 259                           time );
 260     }
 261
 262     /* after this, invalidate the drop_target's GdkDragContext */
 263     drop_target->SetDragContext( (GdkDragContext*) NULL );
 264
 265     /* after this, invalidate the drop_target's drag widget */
 266     drop_target->SetDragWidget( (GtkWidget*) NULL );
 267
 268     /* this has to be done because GDK has no "drag_enter" event */
 269     drop_target->m_firstMotion = TRUE;
 270
 271     return ret;
 272 }
 273
 274 // ----------------------------------------------------------------------------
 275 // "drag_data_received"
 276 // ----------------------------------------------------------------------------
 277
 278 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 279                                        GdkDragContext *context,
 280                                        gint x,
 281                                        gint y,
 282                                        GtkSelectionData *data,
 283                                        guint WXUNUSED(info),
 284                                        guint time,
 285                                        wxDropTarget *drop_target )
 286 {
 287     if (g_isIdle) wxapp_install_idle_handler();
 288
 289     /* Owen Taylor: "call gtk_drag_finish() with
 290        success == TRUE" */
 291
 292 //    printf( "data received.\n" );
 293
 294     if ((data->length <= 0) || (data->format != 8))
 295     {
 296         /* negative data length and non 8-bit data format
 297            qualifies for junk */
 298         gtk_drag_finish (context, FALSE, FALSE, time);
 299
 300 //        printf( "no data.\n" );
 301
 302         return;
 303     }
 304
 305     /* inform the wxDropTarget about the current GtkSelectionData.
 306        this is only valid for the duration of this call */
 307     drop_target->SetDragData( data );
 308
 309     if (drop_target->OnData( x, y ))
 310     {
 311         /* tell GTK that data transfer was successfull */
 312         gtk_drag_finish( context, TRUE, FALSE, time );
 313     }
 314     else
 315     {
 316         /* tell GTK that data transfer was not successfull */
 317         gtk_drag_finish( context, FALSE, FALSE, time );
 318     }
 319
 320     /* after this, invalidate the drop_target's drag data */
 321     drop_target->SetDragData( (GtkSelectionData*) NULL );
 322 }
 323
 324 //----------------------------------------------------------------------------
 325 // wxDropTarget
 326 //----------------------------------------------------------------------------
 327
 328 wxDropTarget::wxDropTarget()
 329 {
 330     m_firstMotion = TRUE;
 331     m_dragContext = (GdkDragContext*) NULL;
 332     m_dragWidget = (GtkWidget*) NULL;
 333     m_dragData = (GtkSelectionData*) NULL;
 334     m_dragTime = 0;
 335 }
 336
 337 wxDropTarget::~wxDropTarget()
 338 {
 339 }
 340
 341 void wxDropTarget::OnEnter()
 342 {
 343 }
 344
 345 void wxDropTarget::OnLeave()
 346 {
 347 }
 348
 349 bool wxDropTarget::OnMove( long WXUNUSED(x), long WXUNUSED(y) )
 350 {
 351     return TRUE;
 352 }
 353
 354 bool wxDropTarget::OnDrop( long WXUNUSED(x), long WXUNUSED(y) )
 355 {
 356     return FALSE;
 357 }
 358
 359 bool wxDropTarget::OnData( long WXUNUSED(x), long WXUNUSED(y) )
 360 {
 361     return FALSE;
 362 }
 363
 364 bool wxDropTarget::RequestData( wxDataFormat format )
 365 {
 366     if (!m_dragContext) return FALSE;
 367     if (!m_dragWidget) return FALSE;
 368
 369 /*
 370     wxPrintf( wxT("format: %s.\n"), format.GetId().c_str() );
 371     if (format.GetType() == wxDF_PRIVATE) wxPrintf( wxT("private data.\n") );
 372     if (format.GetType() == wxDF_TEXT) wxPrintf( wxT("text data.\n") );
 373 */
 374
 375 #if wxUSE_THREADS
 376     /* disable GUI threads */
 377     wxapp_uninstall_thread_wakeup();
 378 #endif
 379
 380     /* this should trigger an "drag_data_received" event */
 381     gtk_drag_get_data( m_dragWidget,
 382                        m_dragContext,
 383                        format,
 384                        m_dragTime );
 385
 386 #if wxUSE_THREADS
 387     /* re-enable GUI threads */
 388     wxapp_install_thread_wakeup();
 389 #endif
 390
 391     return TRUE;
 392 }
 393
 394 bool wxDropTarget::IsSupported( wxDataFormat format )
 395 {
 396     if (!m_dragContext) return FALSE;
 397
 398     GList *child = m_dragContext->targets;
 399     while (child)
 400     {
 401         GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
 402
 403 //        char *name = gdk_atom_name( formatAtom );
 404 //        if (name) printf( "Format available: %s.\n", name );
 405
 406         if (formatAtom == format) return TRUE;
 407         child = child->next;
 408     }
 409
 410     return FALSE;
 411 }
 412
 413 bool wxDropTarget::GetData( wxDataObject *data_object )
 414 {
 415     if (!m_dragData) return FALSE;
 416
 417     if (m_dragData->target !=  data_object->GetFormat()) return FALSE;
 418
 419     if (data_object->GetFormat().GetType() == wxDF_TEXT)
 420     {
 421         wxTextDataObject *text_object = (wxTextDataObject*)data_object;
 422         text_object->SetText( (const char*)m_dragData->data );
 423     } else
 424
 425     if (data_object->GetFormat().GetType() == wxDF_FILENAME)
 426     {
 427     } else
 428
 429     if (data_object->GetFormat().GetType() == wxDF_PRIVATE)
 430     {
 431         wxPrivateDataObject *priv_object = (wxPrivateDataObject*)data_object;
 432         priv_object->SetData( (const char*)m_dragData->data, (size_t)m_dragData->length );
 433     }
 434
 435     return TRUE;
 436 }
 437
 438 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 439 {
 440     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 441
 442     gtk_drag_dest_unset( widget );
 443
 444     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 445                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 446
 447     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 448                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 449
 450     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 451                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 452
 453     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 454                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 455 }
 456
 457 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 458 {
 459     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 460
 461     /* gtk_drag_dest_set() determines what default behaviour we'd like
 462        GTK to supply. we don't want to specify out targets (=formats)
 463        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 464        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 465        "drag_motion" and "drag_drop" events. this makes it possible
 466        to allow dropping on only a small area. we should set
 467        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 468        highlighting if dragging over standard controls, but this
 469        seems to be broken without the other two. */
 470
 471     gtk_drag_dest_set( widget,
 472                        (GtkDestDefaults) 0,         /* no default behaviour */
 473                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 474                        0,                           /* number of targets = 0 */
 475                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 476
 477     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 478                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 479
 480     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 481                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 482
 483     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 484                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 485
 486     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 487                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 488 }
 489
 490 //-------------------------------------------------------------------------
 491 // wxTextDropTarget
 492 //-------------------------------------------------------------------------
 493
 494 bool wxTextDropTarget::OnMove( long WXUNUSED(x), long WXUNUSED(y) )
 495 {
 496     return IsSupported( wxDF_TEXT );
 497 }
 498
 499 bool wxTextDropTarget::OnDrop( long WXUNUSED(x), long WXUNUSED(y) )
 500 {
 501     if (IsSupported( wxDF_TEXT ))
 502     {
 503         RequestData( wxDF_TEXT );
 504         return TRUE;
 505     }
 506
 507     return FALSE;
 508 }
 509
 510 bool wxTextDropTarget::OnData( long x, long y )
 511 {
 512     wxTextDataObject data;
 513     if (!GetData( &data )) return FALSE;
 514
 515     OnDropText( x, y, data.GetText() );
 516
 517     return TRUE;
 518 }
 519
 520 //-------------------------------------------------------------------------
 521 // wxPrivateDropTarget
 522 //-------------------------------------------------------------------------
 523
 524 /*
 525 wxPrivateDropTarget::wxPrivateDropTarget()
 526 {
 527     m_id = wxTheApp->GetAppName();
 528 }
 529
 530 wxPrivateDropTarget::wxPrivateDropTarget( const wxString &id )
 531 {
 532     m_id = id;
 533 }
 534
 535 bool wxPrivateDropTarget::OnMove( long WXUNUSED(x), long WXUNUSED(y) )
 536 {
 537     return IsSupported( m_id );
 538 }
 539
 540 bool wxPrivateDropTarget::OnDrop( long WXUNUSED(x), long WXUNUSED(y) )
 541 {
 542     if (!IsSupported( m_id ))
 543     {
 544         RequestData( m_id );
 545         return FALSE;
 546     }
 547
 548     return FALSE;
 549 }
 550
 551 bool wxPrivateDropTarget::OnData( long x, long y )
 552 {
 553     if (!IsSupported( m_id )) return FALSE;
 554
 555     wxPrivateDataObject data;
 556     if (!GetData( &data )) return FALSE;
 557
 558     OnDropData( x, y, data.GetData(), data.GetSize() );
 559
 560     return TRUE;
 561 }
 562 */
 563
 564 //----------------------------------------------------------------------------
 565 // A drop target which accepts files (dragged from File Manager or Explorer)
 566 //----------------------------------------------------------------------------
 567
 568 bool wxFileDropTarget::OnMove( long WXUNUSED(x), long WXUNUSED(y) )
 569 {
 570     return IsSupported( wxDF_FILENAME );
 571 }
 572
 573 bool wxFileDropTarget::OnDrop( long x, long y )
 574 {
 575     if (IsSupported( wxDF_FILENAME ))
 576     {
 577         RequestData( wxDF_FILENAME );
 578         return TRUE;
 579     }
 580
 581     return FALSE;
 582 }
 583
 584 bool wxFileDropTarget::OnData( long x, long y )
 585 {
 586     wxFileDataObject data;
 587     if (!GetData( &data )) return FALSE;
 588
 589     // get number of substrings /root/mytext.txt/0/root/myothertext.txt/0/0
 590     size_t number = 0;
 591     size_t i;
 592     size_t size = data.GetFiles().Length();
 593     wxChar *text = WXSTRINGCAST data.GetFiles();
 594     for ( i = 0; i < size; i++)
 595         if (text[i] == 0) number++;
 596
 597     if (number == 0) return FALSE;
 598
 599     wxChar **files = new wxChar*[number];
 600
 601     text = WXSTRINGCAST data.GetFiles();
 602     for (i = 0; i < number; i++)
 603     {
 604         files[i] = text;
 605         int len = wxStrlen( text );
 606         text += len+1;
 607     }
 608
 609     OnDropFiles( x, y, number, files );
 610
 611     free( files );
 612
 613     return TRUE;
 614 }
 615
 616 //----------------------------------------------------------------------------
 617 // "drag_data_get"
 618 //----------------------------------------------------------------------------
 619
 620 static void
 621 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 622                        GdkDragContext     *context,
 623                        GtkSelectionData   *selection_data,
 624                        guint               WXUNUSED(info),
 625                        guint               WXUNUSED(time),
 626                        wxDropSource       *drop_source )
 627 {
 628     if (g_isIdle) wxapp_install_idle_handler();
 629
 630 //    printf( "Provide data!\n" );
 631
 632 //    char *name = gdk_atom_name( selection_data->target );
 633 //    if (name) printf( "Format requested: %s.\n", name );
 634
 635     drop_source->m_retValue = wxDragCancel;
 636
 637     wxDataObject *data = drop_source->m_data;
 638
 639     if (!data)
 640         return;
 641
 642     if (!data->IsSupportedFormat(selection_data->target))
 643         return;
 644
 645     if (data->GetDataSize(selection_data->target) == 0)
 646         return;
 647
 648     size_t size = data->GetDataSize(selection_data->target);
 649
 650 //  printf( "data size: %d.\n", (int)data_size );
 651
 652     guchar *d = new guchar[size];
 653
 654     if (!data->GetDataHere( selection_data->target, (void*)d ))
 655     {
 656         free( d );
 657         return;
 658     }
 659
 660 #if wxUSE_THREADS
 661     /* disable GUI threads */
 662     wxapp_uninstall_thread_wakeup();
 663 #endif
 664
 665                 gtk_selection_data_set( selection_data,
 666                                         selection_data->target,
 667                                         8,   // 8-bit
 668                                         d,
 669                                         size );
 670
 671 #if wxUSE_THREADS
 672     /* enable GUI threads */
 673     wxapp_install_thread_wakeup();
 674 #endif
 675
 676     free( d );
 677
 678     /* so far only copy, no moves. TODO. */
 679     drop_source->m_retValue = wxDragCopy;
 680 }
 681
 682 //----------------------------------------------------------------------------
 683 // "drag_data_delete"
 684 //----------------------------------------------------------------------------
 685
 686 static void source_drag_data_delete( GtkWidget          *WXUNUSED(widget),
 687                                      GdkDragContext     *WXUNUSED(context),
 688                                      wxDropSource       *drop_source )
 689 {
 690     if (g_isIdle) wxapp_install_idle_handler();
 691
 692 //  printf( "Delete the data!\n" );
 693
 694     drop_source->m_retValue = wxDragMove;
 695 }
 696
 697 //----------------------------------------------------------------------------
 698 // "drag_begin"
 699 //----------------------------------------------------------------------------
 700
 701 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 702                                GdkDragContext     *WXUNUSED(context),
 703                                wxDropSource       *WXUNUSED(drop_source) )
 704 {
 705     if (g_isIdle) wxapp_install_idle_handler();
 706
 707 //  printf( "drag_begin.\n" );
 708 }
 709
 710 //----------------------------------------------------------------------------
 711 // "drag_end"
 712 //----------------------------------------------------------------------------
 713
 714 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 715                              GdkDragContext     *WXUNUSED(context),
 716                              wxDropSource       *drop_source )
 717 {
 718     if (g_isIdle) wxapp_install_idle_handler();
 719
 720 //  printf( "drag_end.\n" );
 721
 722     drop_source->m_waiting = FALSE;
 723 }
 724
 725 //---------------------------------------------------------------------------
 726 // wxDropSource
 727 //---------------------------------------------------------------------------
 728
 729 wxDropSource::wxDropSource( wxWindow *win, const wxIcon &go, const wxIcon &stop )
 730 {
 731     g_blockEventsOnDrag = TRUE;
 732     m_waiting = TRUE;
 733
 734     m_window = win;
 735     m_widget = win->m_widget;
 736     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 737
 738     m_data = (wxDataObject*) NULL;
 739     m_retValue = wxDragCancel;
 740
 741     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 742     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 743
 744     m_goIcon = go;
 745     if (wxNullIcon == go) m_goIcon = wxIcon( page_xpm );
 746     m_stopIcon = stop;
 747     if (wxNullIcon == stop) m_stopIcon = wxIcon( gv_xpm );
 748 }
 749
 750 wxDropSource::wxDropSource( wxDataObject& data, wxWindow *win,
 751                             const wxIcon &go, const wxIcon &stop )
 752 {
 753     m_waiting = TRUE;
 754
 755     m_window = win;
 756     m_widget = win->m_widget;
 757     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 758     m_retValue = wxDragCancel;
 759
 760     m_data = &data;
 761
 762     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 763     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 764
 765     m_goIcon = go;
 766     if (wxNullIcon == go) m_goIcon = wxIcon( page_xpm );
 767     m_stopIcon = stop;
 768     if (wxNullIcon == stop) m_stopIcon = wxIcon( gv_xpm );
 769 }
 770
 771 void wxDropSource::SetData( wxDataObject& data )
 772 {
 773     if (m_data)
 774         delete m_data;
 775
 776     m_data = &data;
 777 }
 778
 779 wxDropSource::~wxDropSource()
 780 {
 781     if (m_data)
 782 //        delete m_data;
 783
 784     g_blockEventsOnDrag = FALSE;
 785 }
 786
 787 wxDragResult wxDropSource::DoDragDrop( bool WXUNUSED(bAllowMove) )
 788 {
 789     wxASSERT_MSG( m_data, wxT("wxDragSource: no data") );
 790
 791     if (!m_data) return (wxDragResult) wxDragNone;
 792
 793     g_blockEventsOnDrag = TRUE;
 794
 795     RegisterWindow();
 796
 797     m_waiting = TRUE;
 798
 799     GdkAtom atom = gdk_atom_intern( "STRING", FALSE );
 800 //    printf( "atom id: %d.\n", (int)atom );
 801
 802     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 803     gtk_target_list_add( target_list, atom, 0, 0 );
 804
 805     GdkEventMotion event;
 806     event.window = m_widget->window;
 807     int x = 0;
 808     int y = 0;
 809     GdkModifierType state;
 810     gdk_window_get_pointer( event.window, &x, &y, &state );
 811     event.x = x;
 812     event.y = y;
 813     event.state = state;
 814     event.time = GDK_CURRENT_TIME;
 815
 816     /* GTK wants to know which button was pressed which caused the dragging */
 817     int button_number = 0;
 818     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 819     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 820     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 821
 822 #if wxUSE_THREADS
 823     /* disable GUI threads */
 824     wxapp_uninstall_thread_wakeup();
 825 #endif
 826
 827     /* don't start dragging if no button is down */
 828     if (button_number)
 829     {
 830         GdkDragContext *context = gtk_drag_begin( m_widget,
 831                                               target_list,
 832                                               GDK_ACTION_COPY,
 833                                               button_number,  /* number of mouse button which started drag */
 834                                               (GdkEvent*) &event );
 835
 836         wxMask *mask = m_goIcon.GetMask();
 837         GdkBitmap *bm = (GdkBitmap *) NULL;
 838         if (mask) bm = mask->GetBitmap();
 839         GdkPixmap *pm = m_goIcon.GetPixmap();
 840
 841         gtk_drag_set_icon_pixmap( context,
 842                                   gtk_widget_get_colormap( m_widget ),
 843                                   pm,
 844                                   bm,
 845                                   0,
 846                                   0 );
 847
 848         while (m_waiting) gtk_main_iteration();;
 849     }
 850
 851 #if wxUSE_THREADS
 852     /* re-enable GUI threads */
 853     wxapp_install_thread_wakeup();
 854 #endif
 855
 856     g_blockEventsOnDrag = FALSE;
 857
 858     UnregisterWindow();
 859
 860     return m_retValue;
 861 }
 862
 863 void wxDropSource::RegisterWindow()
 864 {
 865     if (!m_widget) return;
 866
 867     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 868                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 869     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 870                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 871     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 872                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 873     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 874                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 875
 876 }
 877
 878 void wxDropSource::UnregisterWindow()
 879 {
 880     if (!m_widget) return;
 881
 882     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 883                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 884     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 885                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 886     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 887                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 888     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 889                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 890 }
 891
 892 #endif
 893
 894       // wxUSE_DRAG_AND_DROP