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 * page_xpm[] = {
  59 /* width height ncolors chars_per_pixel */
  60 "32 32 5 1",
  61 /* colors */
  62 "         s None        c None",
  63 ".        c black",
  64 "X        c wheat",
  65 "o        c tan",
  66 "O        c #6699FF",
  67 /* pixels */
  68 "    ...................         ",
  69 "    .XXXXXXXXXXXXXXXXX..        ",
  70 "    .XXXXXXXXXXXXXXXXX.o.       ",
  71 "    .XXXXXXXXXXXXXXXXX.oo.      ",
  72 "    .XXXXXXXXXXXXXXXXX.ooo.     ",
  73 "    .XXXXXXXXXXXXXXXXX.oooo.    ",
  74 "    .XXXXXXXXXXXXXXXXX.......   ",
  75 "    .XXXXXOOOOOOOOOOXXXooooo.   ",
  76 "    .XXXXXXXXXXXXXXXXXXooooo.   ",
  77 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
  78 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  79 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
  80 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  81 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
  82 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  83 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
  84 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  85 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
  86 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  87 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
  88 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  89 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
  90 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  91 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
  92 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  93 "    .XXXXXOOOOOOOXXXXXXXXXXX.   ",
  94 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  95 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  96 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  97 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  98 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  99 "    .........................   "};
 100
 101
 102
 103 // ----------------------------------------------------------------------------
 104 // "drag_leave"
 105 // ----------------------------------------------------------------------------
 106
 107 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 108                                GdkDragContext *context,
 109                                guint WXUNUSED(time),
 110                                wxDropTarget *drop_target )
 111 {
 112     if (g_isIdle) wxapp_install_idle_handler();
 113
 114     /* inform the wxDropTarget about the current GdkDragContext.
 115        this is only valid for the duration of this call */
 116     drop_target->SetDragContext( context );
 117
 118     /* we don't need return values. this event is just for
 119        information */
 120     drop_target->OnLeave();
 121
 122     /* this has to be done because GDK has no "drag_enter" event */
 123     drop_target->m_firstMotion = TRUE;
 124
 125     /* after this, invalidate the drop_target's GdkDragContext */
 126     drop_target->SetDragContext( (GdkDragContext*) NULL );
 127 }
 128
 129 // ----------------------------------------------------------------------------
 130 // "drag_motion"
 131 // ----------------------------------------------------------------------------
 132
 133 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 134                                     GdkDragContext *context,
 135                                     gint x,
 136                                     gint y,
 137                                     guint time,
 138                                     wxDropTarget *drop_target )
 139 {
 140     if (g_isIdle) wxapp_install_idle_handler();
 141
 142     /* Owen Taylor: "if the coordinates not in a drop zone,
 143        return FALSE, otherwise call gtk_drag_status() and
 144        return TRUE" */
 145
 146     /* inform the wxDropTarget about the current GdkDragContext.
 147        this is only valid for the duration of this call */
 148     drop_target->SetDragContext( context );
 149
 150     wxDragResult result;
 151     if ( context->suggested_action == GDK_ACTION_COPY )
 152         result = wxDragCopy;
 153     else
 154         result = wxDragMove;
 155
 156     if (drop_target->m_firstMotion)
 157     {
 158         /* the first "drag_motion" event substitutes a "drag_enter" event */
 159         result = drop_target->OnEnter( x, y, result );
 160     }
 161     else
 162     {
 163         /* give program a chance to react (i.e. to say no by returning FALSE) */
 164         result = drop_target->OnDragOver( x, y, result );
 165     }
 166
 167     bool ret = wxIsDragResultOk( result );
 168     if (ret)
 169     {
 170         GdkDragAction action;
 171         if (result == wxDragCopy)
 172             action = GDK_ACTION_COPY;
 173         else
 174             action = GDK_ACTION_MOVE;
 175
 176         gdk_drag_status( context, action, time );
 177     }
 178
 179     /* after this, invalidate the drop_target's GdkDragContext */
 180     drop_target->SetDragContext( (GdkDragContext*) NULL );
 181
 182     /* this has to be done because GDK has no "drag_enter" event */
 183     drop_target->m_firstMotion = FALSE;
 184
 185     return ret;
 186 }
 187
 188 // ----------------------------------------------------------------------------
 189 // "drag_drop"
 190 // ----------------------------------------------------------------------------
 191
 192 static gboolean target_drag_drop( GtkWidget *widget,
 193                                   GdkDragContext *context,
 194                                   gint x,
 195                                   gint y,
 196                                   guint time,
 197                                   wxDropTarget *drop_target )
 198 {
 199     if (g_isIdle) wxapp_install_idle_handler();
 200
 201     /* Owen Taylor: "if the drop is not in a drop zone,
 202        return FALSE, otherwise, if you aren't accepting
 203        the drop, call gtk_drag_finish() with success == FALSE
 204        otherwise call gtk_drag_data_get()" */
 205
 206 //    printf( "drop.\n" );
 207
 208     /* this seems to make a difference between not accepting
 209        due to wrong target area and due to wrong format. let
 210        us hope that this is not required.. */
 211
 212     /* inform the wxDropTarget about the current GdkDragContext.
 213        this is only valid for the duration of this call */
 214     drop_target->SetDragContext( context );
 215
 216     /* inform the wxDropTarget about the current drag widget.
 217        this is only valid for the duration of this call */
 218     drop_target->SetDragWidget( widget );
 219
 220     /* inform the wxDropTarget about the current drag time.
 221        this is only valid for the duration of this call */
 222     drop_target->SetDragTime( time );
 223
 224 /*
 225     wxDragResult result = wxDragMove;
 226     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 227 */
 228
 229     /* reset the block here as someone might very well
 230        show a dialog as a reaction to a drop and this
 231        wouldn't work without events */
 232     g_blockEventsOnDrag = FALSE;
 233
 234     bool ret = drop_target->OnDrop( x, y );
 235
 236     if (!ret)
 237     {
 238         wxLogDebug( wxT( "Drop target: OnDrop returned FALSE") );
 239
 240         /* cancel the whole thing */
 241         gtk_drag_finish( context,
 242                           FALSE,        /* no success */
 243                           FALSE,        /* don't delete data on dropping side */
 244                           time );
 245     }
 246     else
 247     {
 248         wxLogDebug( wxT( "Drop target: OnDrop returned TRUE") );
 249
 250 #if wxUSE_THREADS
 251         /* disable GUI threads */
 252         wxapp_uninstall_thread_wakeup();
 253 #endif
 254
 255         GdkAtom format = drop_target->GetMatchingPair();
 256         wxASSERT( format );
 257
 258 /*
 259         GdkDragAction action = GDK_ACTION_MOVE;
 260         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 261         context->action = action;
 262 */
 263         /* this should trigger an "drag_data_received" event */
 264         gtk_drag_get_data( widget,
 265                            context,
 266                            format,
 267                            time );
 268
 269 #if wxUSE_THREADS
 270         /* re-enable GUI threads */
 271         wxapp_install_thread_wakeup();
 272 #endif
 273     }
 274
 275     /* after this, invalidate the drop_target's GdkDragContext */
 276     drop_target->SetDragContext( (GdkDragContext*) NULL );
 277
 278     /* after this, invalidate the drop_target's drag widget */
 279     drop_target->SetDragWidget( (GtkWidget*) NULL );
 280
 281     /* this has to be done because GDK has no "drag_enter" event */
 282     drop_target->m_firstMotion = TRUE;
 283
 284     return ret;
 285 }
 286
 287 // ----------------------------------------------------------------------------
 288 // "drag_data_received"
 289 // ----------------------------------------------------------------------------
 290
 291 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 292                                        GdkDragContext *context,
 293                                        gint x,
 294                                        gint y,
 295                                        GtkSelectionData *data,
 296                                        guint WXUNUSED(info),
 297                                        guint time,
 298                                        wxDropTarget *drop_target )
 299 {
 300     if (g_isIdle) wxapp_install_idle_handler();
 301
 302     /* Owen Taylor: "call gtk_drag_finish() with
 303        success == TRUE" */
 304
 305     if ((data->length <= 0) || (data->format != 8))
 306     {
 307         /* negative data length and non 8-bit data format
 308            qualifies for junk */
 309         gtk_drag_finish (context, FALSE, FALSE, time);
 310
 311         return;
 312     }
 313
 314     wxLogDebug( wxT( "Drop target: data received event") );
 315
 316     /* inform the wxDropTarget about the current GtkSelectionData.
 317        this is only valid for the duration of this call */
 318     drop_target->SetDragData( data );
 319
 320     wxDragResult result;
 321     if ( context->suggested_action == GDK_ACTION_COPY )
 322         result = wxDragCopy;
 323     else
 324         result = wxDragMove;
 325
 326     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 327     {
 328         wxLogDebug( wxT( "Drop target: OnData returned TRUE") );
 329
 330         /* tell GTK that data transfer was successfull */
 331         gtk_drag_finish( context, TRUE, FALSE, time );
 332     }
 333     else
 334     {
 335         wxLogDebug( wxT( "Drop target: OnData returned FALSE") );
 336
 337         /* tell GTK that data transfer was not successfull */
 338         gtk_drag_finish( context, FALSE, FALSE, time );
 339     }
 340
 341     /* after this, invalidate the drop_target's drag data */
 342     drop_target->SetDragData( (GtkSelectionData*) NULL );
 343 }
 344
 345 //----------------------------------------------------------------------------
 346 // wxDropTarget
 347 //----------------------------------------------------------------------------
 348
 349 wxDropTarget::wxDropTarget( wxDataObject *data )
 350             : wxDropTargetBase( data )
 351 {
 352     m_firstMotion = TRUE;
 353     m_dragContext = (GdkDragContext*) NULL;
 354     m_dragWidget = (GtkWidget*) NULL;
 355     m_dragData = (GtkSelectionData*) NULL;
 356     m_dragTime = 0;
 357 }
 358
 359 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 360                                        wxCoord WXUNUSED(y),
 361                                        wxDragResult def )
 362 {
 363     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 364
 365     // disable the debug message from GetMatchingPair() - there are too many
 366     // of them otherwise
 367 #ifdef __WXDEBUG__
 368     wxLogNull noLog;
 369 #endif // Debug
 370
 371     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 372 }
 373
 374 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 375 {
 376     if (!m_dataObject)
 377         return FALSE;
 378
 379     return (GetMatchingPair() != (GdkAtom) 0);
 380 }
 381
 382 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 383                                    wxDragResult def )
 384 {
 385     if (!m_dataObject)
 386         return wxDragNone;
 387
 388     if (GetMatchingPair() == (GdkAtom) 0)
 389         return wxDragNone;
 390
 391     return GetData() ? def : wxDragNone;
 392 }
 393
 394 GdkAtom wxDropTarget::GetMatchingPair()
 395 {
 396     if (!m_dataObject)
 397         return (GdkAtom) 0;
 398
 399     if (!m_dragContext)
 400         return (GdkAtom) 0;
 401
 402     GList *child = m_dragContext->targets;
 403     while (child)
 404     {
 405         GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
 406         wxDataFormat format( formatAtom );
 407
 408 #ifdef __WXDEBUG__
 409         wxLogDebug( wxT("Drop target: drag has format: %s"), format.GetId().c_str() );
 410 #endif // Debug
 411
 412         if (m_dataObject->IsSupportedFormat( format ))
 413             return formatAtom;
 414
 415         child = child->next;
 416     }
 417
 418     return (GdkAtom) 0;
 419 }
 420
 421 bool wxDropTarget::GetData()
 422 {
 423     if (!m_dragData)
 424         return FALSE;
 425
 426     if (!m_dataObject)
 427         return FALSE;
 428
 429     wxDataFormat dragFormat( m_dragData->target );
 430
 431     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 432         return FALSE;
 433
 434     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 435
 436     return TRUE;
 437 }
 438
 439 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 440 {
 441     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 442
 443     gtk_drag_dest_unset( widget );
 444
 445     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 446                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 447
 448     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 449                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 450
 451     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 452                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 453
 454     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 455                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 456 }
 457
 458 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 459 {
 460     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 461
 462     /* gtk_drag_dest_set() determines what default behaviour we'd like
 463        GTK to supply. we don't want to specify out targets (=formats)
 464        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 465        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 466        "drag_motion" and "drag_drop" events. this makes it possible
 467        to allow dropping on only a small area. we should set
 468        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 469        highlighting if dragging over standard controls, but this
 470        seems to be broken without the other two. */
 471
 472     gtk_drag_dest_set( widget,
 473                        (GtkDestDefaults) 0,         /* no default behaviour */
 474                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 475                        0,                           /* number of targets = 0 */
 476                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 477
 478     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 479                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 480
 481     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 482                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 483
 484     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 485                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 486
 487     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 488                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 489 }
 490
 491 //----------------------------------------------------------------------------
 492 // "drag_data_get"
 493 //----------------------------------------------------------------------------
 494
 495 static void
 496 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 497                        GdkDragContext     *WXUNUSED(context),
 498                        GtkSelectionData   *selection_data,
 499                        guint               WXUNUSED(info),
 500                        guint               WXUNUSED(time),
 501                        wxDropSource       *drop_source )
 502 {
 503     if (g_isIdle) wxapp_install_idle_handler();
 504
 505     wxDataFormat format( selection_data->target );
 506
 507     wxLogDebug( wxT("Drop source: format requested: %s"), format.GetId().c_str() );
 508
 509     drop_source->m_retValue = wxDragCancel;
 510
 511     wxDataObject *data = drop_source->GetDataObject();
 512
 513     if (!data)
 514     {
 515         wxLogDebug( wxT("Drop source: no data object") );
 516         return;
 517     }
 518
 519     if (!data->IsSupportedFormat(format))
 520     {
 521         wxLogDebug( wxT("Drop source: unsupported format") );
 522         return;
 523     }
 524
 525     if (data->GetDataSize(format) == 0)
 526     {
 527         wxLogDebug( wxT("Drop source: empty data") );
 528         return;
 529     }
 530
 531     size_t size = data->GetDataSize(format);
 532
 533 //  printf( "data size: %d.\n", (int)data_size );
 534
 535     guchar *d = new guchar[size];
 536
 537     if (!data->GetDataHere( format, (void*)d ))
 538     {
 539         delete[] d;
 540         return;
 541     }
 542
 543 #if wxUSE_THREADS
 544     /* disable GUI threads */
 545     wxapp_uninstall_thread_wakeup();
 546 #endif
 547
 548                 gtk_selection_data_set( selection_data,
 549                                         selection_data->target,
 550                                         8,   // 8-bit
 551                                         d,
 552                                         size );
 553
 554 #if wxUSE_THREADS
 555     /* enable GUI threads */
 556     wxapp_install_thread_wakeup();
 557 #endif
 558
 559     delete[] d;
 560 }
 561
 562 //----------------------------------------------------------------------------
 563 // "drag_data_delete"
 564 //----------------------------------------------------------------------------
 565
 566 static void source_drag_data_delete( GtkWidget          *WXUNUSED(widget),
 567                                      GdkDragContext     *WXUNUSED(context),
 568                                      wxDropSource       *WXUNUSED(drop_source) )
 569 {
 570     if (g_isIdle)
 571         wxapp_install_idle_handler();
 572
 573     // printf( "Drag source: drag_data_delete\n" );
 574 }
 575
 576 //----------------------------------------------------------------------------
 577 // "drag_begin"
 578 //----------------------------------------------------------------------------
 579
 580 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 581                                GdkDragContext     *WXUNUSED(context),
 582                                wxDropSource       *WXUNUSED(drop_source) )
 583 {
 584     if (g_isIdle)
 585         wxapp_install_idle_handler();
 586
 587     // printf( "Drag source: drag_begin.\n" );
 588 }
 589
 590 //----------------------------------------------------------------------------
 591 // "drag_end"
 592 //----------------------------------------------------------------------------
 593
 594 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 595                              GdkDragContext     *WXUNUSED(context),
 596                              wxDropSource       *drop_source )
 597 {
 598     if (g_isIdle) wxapp_install_idle_handler();
 599
 600     // printf( "Drag source: drag_end.\n" );
 601
 602     drop_source->m_waiting = FALSE;
 603 }
 604
 605 //-----------------------------------------------------------------------------
 606 // "configure_event" from m_iconWindow
 607 //-----------------------------------------------------------------------------
 608
 609 static gint
 610 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 611 {
 612     if (g_isIdle)
 613         wxapp_install_idle_handler();
 614
 615     wxDragResult action = wxDragNone;
 616     if (source->m_dragContext->action == GDK_ACTION_COPY) action = wxDragCopy;
 617     if (source->m_dragContext->action == GDK_ACTION_MOVE) action = wxDragMove;
 618
 619     source->GiveFeedback( action );
 620
 621     return 0;
 622 }
 623
 624 //---------------------------------------------------------------------------
 625 // wxDropSource
 626 //---------------------------------------------------------------------------
 627
 628 wxDropSource::wxDropSource(wxWindow *win,
 629                            const wxIcon &iconCopy,
 630                            const wxIcon &iconMove,
 631                            const wxIcon &iconNone)
 632 {
 633     m_waiting = TRUE;
 634
 635     m_iconWindow = (GtkWidget*) NULL;
 636
 637     m_window = win;
 638     m_widget = win->m_widget;
 639     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 640
 641     m_retValue = wxDragCancel;
 642
 643     SetIcons(iconCopy, iconMove, iconNone);
 644 }
 645
 646 wxDropSource::wxDropSource(wxDataObject& data,
 647                            wxWindow *win,
 648                            const wxIcon &iconCopy,
 649                            const wxIcon &iconMove,
 650                            const wxIcon &iconNone)
 651 {
 652     m_waiting = TRUE;
 653
 654     SetData( data );
 655
 656     m_iconWindow = (GtkWidget*) NULL;
 657
 658     m_window = win;
 659     m_widget = win->m_widget;
 660     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 661
 662     m_retValue = wxDragCancel;
 663
 664     SetIcons(iconCopy, iconMove, iconNone);
 665 }
 666
 667 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 668                             const wxIcon &iconMove,
 669                             const wxIcon &iconNone)
 670 {
 671     m_iconCopy = iconCopy;
 672     m_iconMove = iconMove;
 673     m_iconNone = iconNone;
 674
 675     if ( !m_iconCopy.Ok() )
 676         m_iconCopy = wxIcon(page_xpm);
 677     if ( !m_iconMove.Ok() )
 678         m_iconMove = m_iconCopy;
 679     if ( !m_iconNone.Ok() )
 680         m_iconNone = m_iconCopy;
 681 }
 682
 683 wxDropSource::~wxDropSource()
 684 {
 685 }
 686
 687 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 688 {
 689     // get the right icon to display
 690     wxIcon *icon = NULL;
 691     if ( action & GDK_ACTION_MOVE )
 692         icon = &m_iconMove;
 693     else if ( action & GDK_ACTION_COPY )
 694         icon = &m_iconCopy;
 695     else
 696         icon = &m_iconNone;
 697
 698     GdkBitmap *mask;
 699     if ( icon->GetMask() )
 700         mask = icon->GetMask()->GetBitmap();
 701     else
 702         mask = (GdkBitmap *)NULL;
 703
 704     GdkPixmap *pixmap = icon->GetPixmap();
 705
 706     gint width,height;
 707     gdk_window_get_size (pixmap, &width, &height);
 708
 709     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 710 #ifndef __WXGTK20__
 711     gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
 712 #endif
 713     gtk_widget_push_colormap (colormap);
 714
 715     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 716     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 717     gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
 718
 719 #ifndef __WXGTK20__
 720     gtk_widget_pop_visual ();
 721 #endif
 722     gtk_widget_pop_colormap ();
 723
 724     gtk_widget_set_usize (m_iconWindow, width, height);
 725     gtk_widget_realize (m_iconWindow);
 726
 727     gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
 728         GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
 729
 730     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 731
 732     if (mask)
 733         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 734
 735     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 736 }
 737
 738 wxDragResult wxDropSource::DoDragDrop( bool allowMove )
 739 {
 740     wxASSERT_MSG( m_data, wxT("Drop source: no data") );
 741
 742     if (!m_data)
 743         return (wxDragResult) wxDragNone;
 744
 745     if (m_data->GetFormatCount() == 0)
 746         return (wxDragResult) wxDragNone;
 747
 748     // still in drag
 749     if (g_blockEventsOnDrag)
 750         return (wxDragResult) wxDragNone;
 751
 752     // disabled for now
 753     g_blockEventsOnDrag = TRUE;
 754
 755     RegisterWindow();
 756
 757     m_waiting = TRUE;
 758
 759     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 760
 761     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 762     m_data->GetAllFormats( array );
 763     for (size_t i = 0; i < m_data->GetFormatCount(); i++)
 764     {
 765         GdkAtom atom = array[i];
 766         wxLogDebug( wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ) );
 767         gtk_target_list_add( target_list, atom, 0, 0 );
 768     }
 769     delete[] array;
 770
 771     GdkEventMotion event;
 772     event.window = m_widget->window;
 773     int x = 0;
 774     int y = 0;
 775     GdkModifierType state;
 776     gdk_window_get_pointer( event.window, &x, &y, &state );
 777     event.x = x;
 778     event.y = y;
 779     event.state = state;
 780     event.time = (guint32)GDK_CURRENT_TIME;
 781
 782     /* GTK wants to know which button was pressed which caused the dragging */
 783     int button_number = 0;
 784     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 785     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 786     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 787
 788 #if wxUSE_THREADS
 789     /* disable GUI threads */
 790     wxapp_uninstall_thread_wakeup();
 791 #endif
 792
 793     /* don't start dragging if no button is down */
 794     if (button_number)
 795     {
 796         GdkDragAction action = GDK_ACTION_COPY;
 797         if (allowMove) action = (GdkDragAction)(GDK_ACTION_MOVE|GDK_ACTION_COPY);
 798         GdkDragContext *context = gtk_drag_begin( m_widget,
 799                 target_list,
 800                 action,
 801                 button_number,  /* number of mouse button which started drag */
 802                 (GdkEvent*) &event );
 803
 804         m_dragContext = context;
 805
 806         PrepareIcon( action, context );
 807
 808         while (m_waiting) gtk_main_iteration();
 809
 810         if (context->action == GDK_ACTION_COPY)
 811             m_retValue = wxDragCopy;
 812         if (context->action == GDK_ACTION_MOVE)
 813             m_retValue = wxDragMove;
 814     }
 815
 816 #if wxUSE_THREADS
 817     /* re-enable GUI threads */
 818     wxapp_install_thread_wakeup();
 819 #endif
 820
 821     g_blockEventsOnDrag = FALSE;
 822
 823     UnregisterWindow();
 824
 825     return m_retValue;
 826 }
 827
 828 void wxDropSource::RegisterWindow()
 829 {
 830     if (!m_widget) return;
 831
 832     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 833                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 834     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 835                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 836     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 837                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 838     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 839                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 840
 841 }
 842
 843 void wxDropSource::UnregisterWindow()
 844 {
 845     if (!m_widget) return;
 846
 847     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 848                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 849     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 850                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 851     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 852                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 853     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 854                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 855 }
 856
 857 #endif
 858       // wxUSE_DRAG_AND_DROP