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