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.GetAtom(),
 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.GetAtom()) 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().GetAtom()) 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 wxPrivateDropTarget::wxPrivateDropTarget()
 525 {
 526     m_id = wxTheApp->GetAppName();
 527 }
 528
 529 wxPrivateDropTarget::wxPrivateDropTarget( const wxString &id )
 530 {
 531     m_id = id;
 532 }
 533
 534 bool wxPrivateDropTarget::OnMove( long WXUNUSED(x), long WXUNUSED(y) )
 535 {
 536     return IsSupported( m_id );
 537 }
 538
 539 bool wxPrivateDropTarget::OnDrop( long WXUNUSED(x), long WXUNUSED(y) )
 540 {
 541     if (!IsSupported( m_id ))
 542     {
 543         RequestData( m_id );
 544         return FALSE;
 545     }
 546
 547     return FALSE;
 548 }
 549
 550 bool wxPrivateDropTarget::OnData( long x, long y )
 551 {
 552     if (!IsSupported( m_id )) return FALSE;
 553
 554     wxPrivateDataObject data;
 555     if (!GetData( &data )) return FALSE;
 556
 557     OnDropData( x, y, data.GetData(), data.GetSize() );
 558
 559     return TRUE;
 560 }
 561
 562 //----------------------------------------------------------------------------
 563 // A drop target which accepts files (dragged from File Manager or Explorer)
 564 //----------------------------------------------------------------------------
 565
 566 bool wxFileDropTarget::OnMove( long WXUNUSED(x), long WXUNUSED(y) )
 567 {
 568     return IsSupported( wxDF_FILENAME );
 569 }
 570
 571 bool wxFileDropTarget::OnDrop( long x, long y )
 572 {
 573     if (IsSupported( wxDF_FILENAME ))
 574     {
 575         RequestData( wxDF_FILENAME );
 576         return TRUE;
 577     }
 578
 579     return FALSE;
 580 }
 581
 582 bool wxFileDropTarget::OnData( long x, long y )
 583 {
 584     wxFileDataObject data;
 585     if (!GetData( &data )) return FALSE;
 586
 587     /* get number of substrings /root/mytext.txt/0/root/myothertext.txt/0/0 */
 588     size_t number = 0;
 589     size_t i;
 590     size_t size = data.GetFiles().Length();
 591     wxChar *text = WXSTRINGCAST data.GetFiles();
 592     for ( i = 0; i < size; i++)
 593         if (text[i] == 0) number++;
 594
 595     if (number == 0) return FALSE;
 596
 597     wxChar **files = new wxChar*[number];
 598
 599     text = WXSTRINGCAST data.GetFiles();
 600     for (i = 0; i < number; i++)
 601     {
 602         files[i] = text;
 603         int len = wxStrlen( text );
 604         text += len+1;
 605     }
 606
 607     OnDropFiles( x, y, number, files );
 608
 609     free( files );
 610
 611     return TRUE;
 612 }
 613
 614 //----------------------------------------------------------------------------
 615 // "drag_data_get"
 616 //----------------------------------------------------------------------------
 617
 618 static void
 619 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 620                        GdkDragContext     *context,
 621                        GtkSelectionData   *selection_data,
 622                        guint               WXUNUSED(info),
 623                        guint               WXUNUSED(time),
 624                        wxDropSource       *drop_source )
 625 {
 626     if (g_isIdle) wxapp_install_idle_handler();
 627
 628 //    printf( "Provide data!\n" );
 629
 630 //    char *name = gdk_atom_name( selection_data->target );
 631 //    if (name) printf( "Format requested: %s.\n", name );
 632
 633     wxNode *node = drop_source->m_data->m_dataObjects.First();
 634     while (node)
 635     {
 636         wxDataObject *data_object = (wxDataObject*) node->Data();
 637         if (data_object->GetFormat().GetAtom() == selection_data->target)
 638         {
 639 //          printf( "format found.\n" );
 640
 641             size_t data_size = data_object->GetSize();
 642
 643             if (data_size > 0)
 644             {
 645 //              printf( "data size: %d.\n", (int)data_size );
 646
 647                 guchar *buffer = new guchar[data_size];
 648                 data_object->WriteData( buffer );
 649
 650 #if wxUSE_THREADS
 651                 /* disable GUI threads */
 652                 wxapp_uninstall_thread_wakeup();
 653 #endif
 654
 655                 gtk_selection_data_set( selection_data,
 656                                         selection_data->target,
 657                                         8,   // 8-bit
 658                                         buffer,
 659                                         data_size );
 660
 661 #if wxUSE_THREADS
 662                 /* enable GUI threads */
 663                 wxapp_install_thread_wakeup();
 664 #endif
 665                 free( buffer );
 666
 667                 /* so far only copy, no moves. TODO. */
 668                 drop_source->m_retValue = wxDragCopy;
 669
 670                 return;
 671             }
 672         }
 673
 674         node = node->Next();
 675     }
 676
 677     drop_source->m_retValue = wxDragCancel;
 678 }
 679
 680 //----------------------------------------------------------------------------
 681 // "drag_data_delete"
 682 //----------------------------------------------------------------------------
 683
 684 static void source_drag_data_delete( GtkWidget          *WXUNUSED(widget),
 685                                      GdkDragContext     *WXUNUSED(context),
 686                                      wxDropSource       *drop_source )
 687 {
 688     if (g_isIdle) wxapp_install_idle_handler();
 689
 690 //  printf( "Delete the data!\n" );
 691
 692     drop_source->m_retValue = wxDragMove;
 693 }
 694
 695 //----------------------------------------------------------------------------
 696 // "drag_begin"
 697 //----------------------------------------------------------------------------
 698
 699 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 700                                GdkDragContext     *WXUNUSED(context),
 701                                wxDropSource       *WXUNUSED(drop_source) )
 702 {
 703     if (g_isIdle) wxapp_install_idle_handler();
 704
 705 //  printf( "drag_begin.\n" );
 706 }
 707
 708 //----------------------------------------------------------------------------
 709 // "drag_end"
 710 //----------------------------------------------------------------------------
 711
 712 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 713                              GdkDragContext     *WXUNUSED(context),
 714                              wxDropSource       *drop_source )
 715 {
 716     if (g_isIdle) wxapp_install_idle_handler();
 717
 718 //  printf( "drag_end.\n" );
 719
 720     drop_source->m_waiting = FALSE;
 721 }
 722
 723 //---------------------------------------------------------------------------
 724 // wxDropSource
 725 //---------------------------------------------------------------------------
 726
 727 wxDropSource::wxDropSource( wxWindow *win, const wxIcon &go, const wxIcon &stop )
 728 {
 729     g_blockEventsOnDrag = TRUE;
 730     m_waiting = TRUE;
 731
 732     m_window = win;
 733     m_widget = win->m_widget;
 734     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 735
 736     m_data = (wxDataBroker*) NULL;
 737     m_retValue = wxDragCancel;
 738
 739     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 740     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 741
 742     m_goIcon = go;
 743     if (wxNullIcon == go) m_goIcon = wxIcon( page_xpm );
 744     m_stopIcon = stop;
 745     if (wxNullIcon == stop) m_stopIcon = wxIcon( gv_xpm );
 746 }
 747
 748 wxDropSource::wxDropSource( wxDataObject *data, wxWindow *win, const wxIcon &go, const wxIcon &stop )
 749 {
 750     m_waiting = TRUE;
 751
 752     m_window = win;
 753     m_widget = win->m_widget;
 754     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 755     m_retValue = wxDragCancel;
 756
 757     if (data)
 758     {
 759         m_data = new wxDataBroker();
 760         m_data->Add( data );
 761     }
 762     else
 763     {
 764         m_data = (wxDataBroker*) NULL;
 765     }
 766
 767     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 768     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 769
 770     m_goIcon = go;
 771     if (wxNullIcon == go) m_goIcon = wxIcon( page_xpm );
 772     m_stopIcon = stop;
 773     if (wxNullIcon == stop) m_stopIcon = wxIcon( gv_xpm );
 774 }
 775
 776 wxDropSource::wxDropSource( wxDataBroker *data, wxWindow *win )
 777 {
 778     m_window = win;
 779     m_widget = win->m_widget;
 780     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 781     m_retValue = wxDragCancel;
 782
 783     m_data = data;
 784
 785     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 786     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 787 }
 788
 789 void wxDropSource::SetData( wxDataObject *data )
 790 {
 791     if (m_data) delete m_data;
 792
 793     if (data)
 794     {
 795         m_data = new wxDataBroker();
 796         m_data->Add( data );
 797     }
 798     else
 799     {
 800         m_data = (wxDataBroker*) NULL;
 801     }
 802 }
 803
 804 void wxDropSource::SetData( wxDataBroker *data )
 805 {
 806     if (m_data) delete m_data;
 807
 808     m_data = data;
 809 }
 810
 811 wxDropSource::~wxDropSource(void)
 812 {
 813     if (m_data) delete m_data;
 814
 815     g_blockEventsOnDrag = FALSE;
 816 }
 817
 818 wxDragResult wxDropSource::DoDragDrop( bool WXUNUSED(bAllowMove) )
 819 {
 820     wxASSERT_MSG( m_data, wxT("wxDragSource: no data") );
 821
 822     if (!m_data) return (wxDragResult) wxDragNone;
 823
 824     g_blockEventsOnDrag = TRUE;
 825
 826     RegisterWindow();
 827
 828     m_waiting = TRUE;
 829
 830     GdkAtom atom = gdk_atom_intern( "STRING", FALSE );
 831 //    printf( "atom id: %d.\n", (int)atom );
 832
 833     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 834     gtk_target_list_add( target_list, atom, 0, 0 );
 835
 836     GdkEventMotion event;
 837     event.window = m_widget->window;
 838     int x = 0;
 839     int y = 0;
 840     GdkModifierType state;
 841     gdk_window_get_pointer( event.window, &x, &y, &state );
 842     event.x = x;
 843     event.y = y;
 844     event.state = state;
 845     event.time = GDK_CURRENT_TIME;
 846
 847     /* GTK wants to know which button was pressed which caused the dragging */
 848     int button_number = 0;
 849     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 850     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 851     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 852
 853 #if wxUSE_THREADS
 854     /* disable GUI threads */
 855     wxapp_uninstall_thread_wakeup();
 856 #endif
 857
 858     /* don't start dragging if no button is down */
 859     if (button_number)
 860     {
 861         GdkDragContext *context = gtk_drag_begin( m_widget,
 862                                               target_list,
 863                                               GDK_ACTION_COPY,
 864                                               button_number,  /* number of mouse button which started drag */
 865                                               (GdkEvent*) &event );
 866
 867         wxMask *mask = m_goIcon.GetMask();
 868         GdkBitmap *bm = (GdkBitmap *) NULL;
 869         if (mask) bm = mask->GetBitmap();
 870         GdkPixmap *pm = m_goIcon.GetPixmap();
 871
 872         gtk_drag_set_icon_pixmap( context,
 873                                   gtk_widget_get_colormap( m_widget ),
 874                                   pm,
 875                                   bm,
 876                                   0,
 877                                   0 );
 878
 879         while (m_waiting) gtk_main_iteration();;
 880     }
 881
 882 #if wxUSE_THREADS
 883     /* re-enable GUI threads */
 884     wxapp_install_thread_wakeup();
 885 #endif
 886
 887     g_blockEventsOnDrag = FALSE;
 888
 889     UnregisterWindow();
 890
 891     return m_retValue;
 892 }
 893
 894 void wxDropSource::RegisterWindow()
 895 {
 896     if (!m_widget) return;
 897
 898     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 899                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 900     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 901                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 902     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 903                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 904     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 905                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 906
 907 }
 908
 909 void wxDropSource::UnregisterWindow()
 910 {
 911     if (!m_widget) return;
 912
 913     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 914                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 915     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 916                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 917     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 918                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 919     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 920                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 921 }
 922
 923 #endif
 924
 925       // wxUSE_DRAG_AND_DROP