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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  11     #pragma implementation "dnd.h"
  12 #endif
  13
  14 // For compilers that support precompilation, includes "wx.h".
  15 #include "wx/wxprec.h"
  16
  17 #include "wx/dnd.h"
  18 #include "wx/log.h"
  19
  20
  21 #if wxUSE_DRAG_AND_DROP
  22
  23 #include "wx/window.h"
  24 #include "wx/app.h"
  25 #include "wx/gdicmn.h"
  26 #include "wx/intl.h"
  27 #include "wx/utils.h"
  28
  29 #include "wx/gtk/private.h"
  30
  31 #include <gdk/gdkprivate.h>
  32
  33 #include <gtk/gtkdnd.h>
  34 #include <gtk/gtkselection.h>
  35
  36 //-----------------------------------------------------------------------------
  37 // idle system
  38 //-----------------------------------------------------------------------------
  39
  40 extern void wxapp_install_idle_handler();
  41 extern bool g_isIdle;
  42
  43 //-----------------------------------------------------------------------------
  44 // thread system
  45 //-----------------------------------------------------------------------------
  46
  47 #if wxUSE_THREADS
  48 #endif
  49
  50 //----------------------------------------------------------------------------
  51 // global data
  52 //----------------------------------------------------------------------------
  53
  54 extern bool g_blockEventsOnDrag;
  55
  56 // the flags used for the last DoDragDrop()
  57 static long gs_flagsForDrag = 0;
  58
  59 // the trace mask we use with wxLogTrace() - call
  60 // wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
  61 // (there are quite a few of them, so don't enable this by default)
  62 static const wxChar *TRACE_DND = _T("dnd");
  63
  64 //----------------------------------------------------------------------------
  65 // standard icons
  66 //----------------------------------------------------------------------------
  67
  68 /* XPM */
  69 static const char * page_xpm[] = {
  70 /* width height ncolors chars_per_pixel */
  71 "32 32 5 1",
  72 /* colors */
  73 "         s None        c None",
  74 ".        c black",
  75 "X        c wheat",
  76 "o        c tan",
  77 "O        c #6699FF",
  78 /* pixels */
  79 "    ...................         ",
  80 "    .XXXXXXXXXXXXXXXXX..        ",
  81 "    .XXXXXXXXXXXXXXXXX.o.       ",
  82 "    .XXXXXXXXXXXXXXXXX.oo.      ",
  83 "    .XXXXXXXXXXXXXXXXX.ooo.     ",
  84 "    .XXXXXXXXXXXXXXXXX.oooo.    ",
  85 "    .XXXXXXXXXXXXXXXXX.......   ",
  86 "    .XXXXXOOOOOOOOOOXXXooooo.   ",
  87 "    .XXXXXXXXXXXXXXXXXXooooo.   ",
  88 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
  89 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  90 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
  91 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  92 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
  93 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  94 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
  95 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  96 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
  97 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  98 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
  99 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 100 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 101 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 102 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 103 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 104 "    .XXXXXOOOOOOOXXXXXXXXXXX.   ",
 105 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 106 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 107 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 108 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 109 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 110 "    .........................   "};
 111
 112
 113 // ============================================================================
 114 // private functions
 115 // ============================================================================
 116
 117 // ----------------------------------------------------------------------------
 118 // convert between GTK+ and wxWindows DND constants
 119 // ----------------------------------------------------------------------------
 120
 121 static wxDragResult ConvertFromGTK(long action)
 122 {
 123     switch ( action )
 124     {
 125         case GDK_ACTION_COPY:
 126             return wxDragCopy;
 127
 128         case GDK_ACTION_LINK:
 129             return wxDragLink;
 130
 131         case GDK_ACTION_MOVE:
 132             return wxDragMove;
 133     }
 134
 135     return wxDragNone;
 136 }
 137
 138 // ----------------------------------------------------------------------------
 139 // "drag_leave"
 140 // ----------------------------------------------------------------------------
 141
 142 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 143                                GdkDragContext *context,
 144                                guint WXUNUSED(time),
 145                                wxDropTarget *drop_target )
 146 {
 147     if (g_isIdle) wxapp_install_idle_handler();
 148
 149     /* inform the wxDropTarget about the current GdkDragContext.
 150        this is only valid for the duration of this call */
 151     drop_target->SetDragContext( context );
 152
 153     /* we don't need return values. this event is just for
 154        information */
 155     drop_target->OnLeave();
 156
 157     /* this has to be done because GDK has no "drag_enter" event */
 158     drop_target->m_firstMotion = TRUE;
 159
 160     /* after this, invalidate the drop_target's GdkDragContext */
 161     drop_target->SetDragContext( (GdkDragContext*) NULL );
 162 }
 163
 164 // ----------------------------------------------------------------------------
 165 // "drag_motion"
 166 // ----------------------------------------------------------------------------
 167
 168 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 169                                     GdkDragContext *context,
 170                                     gint x,
 171                                     gint y,
 172                                     guint time,
 173                                     wxDropTarget *drop_target )
 174 {
 175     if (g_isIdle) wxapp_install_idle_handler();
 176
 177     /* Owen Taylor: "if the coordinates not in a drop zone,
 178        return FALSE, otherwise call gtk_drag_status() and
 179        return TRUE" */
 180
 181     /* inform the wxDropTarget about the current GdkDragContext.
 182        this is only valid for the duration of this call */
 183     drop_target->SetDragContext( context );
 184
 185     // GTK+ always supposes that we want to copy the data by default while we
 186     // might want to move it, so examine not only suggested_action - which is
 187     // only good if we don't have our own preferences - but also the actions
 188     // field
 189     wxDragResult result;
 190     if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 191             (context->actions & GDK_ACTION_MOVE ) )
 192     {
 193         // move is requested by the program and allowed by GTK+ - do it, even
 194         // though suggested_action may be currently wxDragCopy
 195         result = wxDragMove;
 196     }
 197     else // use whatever GTK+ says we should
 198     {
 199         result = ConvertFromGTK(context->suggested_action);
 200
 201         if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 202         {
 203             // we're requested to move but we can't
 204             result = wxDragCopy;
 205         }
 206     }
 207
 208     if (drop_target->m_firstMotion)
 209     {
 210         /* the first "drag_motion" event substitutes a "drag_enter" event */
 211         result = drop_target->OnEnter( x, y, result );
 212     }
 213     else
 214     {
 215         /* give program a chance to react (i.e. to say no by returning FALSE) */
 216         result = drop_target->OnDragOver( x, y, result );
 217     }
 218
 219     bool ret = wxIsDragResultOk( result );
 220     if (ret)
 221     {
 222         GdkDragAction action;
 223         if (result == wxDragCopy)
 224             action = GDK_ACTION_COPY;
 225         else if (result == wxDragLink)
 226             action = GDK_ACTION_LINK;
 227         else
 228             action = GDK_ACTION_MOVE;
 229
 230         gdk_drag_status( context, action, time );
 231     }
 232
 233     /* after this, invalidate the drop_target's GdkDragContext */
 234     drop_target->SetDragContext( (GdkDragContext*) NULL );
 235
 236     /* this has to be done because GDK has no "drag_enter" event */
 237     drop_target->m_firstMotion = FALSE;
 238
 239     return ret;
 240 }
 241
 242 // ----------------------------------------------------------------------------
 243 // "drag_drop"
 244 // ----------------------------------------------------------------------------
 245
 246 static gboolean target_drag_drop( GtkWidget *widget,
 247                                   GdkDragContext *context,
 248                                   gint x,
 249                                   gint y,
 250                                   guint time,
 251                                   wxDropTarget *drop_target )
 252 {
 253     if (g_isIdle) wxapp_install_idle_handler();
 254
 255     /* Owen Taylor: "if the drop is not in a drop zone,
 256        return FALSE, otherwise, if you aren't accepting
 257        the drop, call gtk_drag_finish() with success == FALSE
 258        otherwise call gtk_drag_data_get()" */
 259
 260 //    printf( "drop.\n" );
 261
 262     /* this seems to make a difference between not accepting
 263        due to wrong target area and due to wrong format. let
 264        us hope that this is not required.. */
 265
 266     /* inform the wxDropTarget about the current GdkDragContext.
 267        this is only valid for the duration of this call */
 268     drop_target->SetDragContext( context );
 269
 270     /* inform the wxDropTarget about the current drag widget.
 271        this is only valid for the duration of this call */
 272     drop_target->SetDragWidget( widget );
 273
 274     /* inform the wxDropTarget about the current drag time.
 275        this is only valid for the duration of this call */
 276     drop_target->SetDragTime( time );
 277
 278 /*
 279     wxDragResult result = wxDragMove;
 280     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 281 */
 282
 283     /* reset the block here as someone might very well
 284        show a dialog as a reaction to a drop and this
 285        wouldn't work without events */
 286     g_blockEventsOnDrag = FALSE;
 287
 288     bool ret = drop_target->OnDrop( x, y );
 289
 290     if (!ret)
 291     {
 292         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 293
 294         /* cancel the whole thing */
 295         gtk_drag_finish( context,
 296                           FALSE,        /* no success */
 297                           FALSE,        /* don't delete data on dropping side */
 298                           time );
 299     }
 300     else
 301     {
 302         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned TRUE") );
 303
 304 #if wxUSE_THREADS
 305         /* disable GUI threads */
 306 #endif
 307
 308         GdkAtom format = drop_target->GetMatchingPair();
 309
 310         // this does happen somehow, see bug 555111
 311         wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") )
 312
 313 /*
 314         GdkDragAction action = GDK_ACTION_MOVE;
 315         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 316         context->action = action;
 317 */
 318         /* this should trigger an "drag_data_received" event */
 319         gtk_drag_get_data( widget,
 320                            context,
 321                            format,
 322                            time );
 323
 324 #if wxUSE_THREADS
 325         /* re-enable GUI threads */
 326 #endif
 327     }
 328
 329     /* after this, invalidate the drop_target's GdkDragContext */
 330     drop_target->SetDragContext( (GdkDragContext*) NULL );
 331
 332     /* after this, invalidate the drop_target's drag widget */
 333     drop_target->SetDragWidget( (GtkWidget*) NULL );
 334
 335     /* this has to be done because GDK has no "drag_enter" event */
 336     drop_target->m_firstMotion = TRUE;
 337
 338     return ret;
 339 }
 340
 341 // ----------------------------------------------------------------------------
 342 // "drag_data_received"
 343 // ----------------------------------------------------------------------------
 344
 345 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 346                                        GdkDragContext *context,
 347                                        gint x,
 348                                        gint y,
 349                                        GtkSelectionData *data,
 350                                        guint WXUNUSED(info),
 351                                        guint time,
 352                                        wxDropTarget *drop_target )
 353 {
 354     if (g_isIdle) wxapp_install_idle_handler();
 355
 356     /* Owen Taylor: "call gtk_drag_finish() with
 357        success == TRUE" */
 358
 359     if ((data->length <= 0) || (data->format != 8))
 360     {
 361         /* negative data length and non 8-bit data format
 362            qualifies for junk */
 363         gtk_drag_finish (context, FALSE, FALSE, time);
 364
 365         return;
 366     }
 367
 368     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 369
 370     /* inform the wxDropTarget about the current GtkSelectionData.
 371        this is only valid for the duration of this call */
 372     drop_target->SetDragData( data );
 373
 374     wxDragResult result = ConvertFromGTK(context->suggested_action);
 375
 376     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 377     {
 378         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned TRUE") );
 379
 380         /* tell GTK that data transfer was successfull */
 381         gtk_drag_finish( context, TRUE, FALSE, time );
 382     }
 383     else
 384     {
 385         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 386
 387         /* tell GTK that data transfer was not successfull */
 388         gtk_drag_finish( context, FALSE, FALSE, time );
 389     }
 390
 391     /* after this, invalidate the drop_target's drag data */
 392     drop_target->SetDragData( (GtkSelectionData*) NULL );
 393 }
 394
 395 //----------------------------------------------------------------------------
 396 // wxDropTarget
 397 //----------------------------------------------------------------------------
 398
 399 wxDropTarget::wxDropTarget( wxDataObject *data )
 400             : wxDropTargetBase( data )
 401 {
 402     m_firstMotion = TRUE;
 403     m_dragContext = (GdkDragContext*) NULL;
 404     m_dragWidget = (GtkWidget*) NULL;
 405     m_dragData = (GtkSelectionData*) NULL;
 406     m_dragTime = 0;
 407 }
 408
 409 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 410                                        wxCoord WXUNUSED(y),
 411                                        wxDragResult def )
 412 {
 413     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 414
 415     // disable the debug message from GetMatchingPair() - there are too many
 416     // of them otherwise
 417 #ifdef __WXDEBUG__
 418     wxLogNull noLog;
 419 #endif // Debug
 420
 421     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 422 }
 423
 424 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 425 {
 426     if (!m_dataObject)
 427         return FALSE;
 428
 429     return (GetMatchingPair() != (GdkAtom) 0);
 430 }
 431
 432 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 433                                    wxDragResult def )
 434 {
 435     if (!m_dataObject)
 436         return wxDragNone;
 437
 438     if (GetMatchingPair() == (GdkAtom) 0)
 439         return wxDragNone;
 440
 441     return GetData() ? def : wxDragNone;
 442 }
 443
 444 GdkAtom wxDropTarget::GetMatchingPair()
 445 {
 446     if (!m_dataObject)
 447         return (GdkAtom) 0;
 448
 449     if (!m_dragContext)
 450         return (GdkAtom) 0;
 451
 452     GList *child = m_dragContext->targets;
 453     while (child)
 454     {
 455         GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
 456         wxDataFormat format( formatAtom );
 457
 458 #ifdef __WXDEBUG__
 459         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 460                    format.GetId().c_str());
 461 #endif // Debug
 462
 463         if (m_dataObject->IsSupportedFormat( format ))
 464             return formatAtom;
 465
 466         child = child->next;
 467     }
 468
 469     return (GdkAtom) 0;
 470 }
 471
 472 bool wxDropTarget::GetData()
 473 {
 474     if (!m_dragData)
 475         return FALSE;
 476
 477     if (!m_dataObject)
 478         return FALSE;
 479
 480     wxDataFormat dragFormat( m_dragData->target );
 481
 482     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 483         return FALSE;
 484
 485     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 486
 487     return TRUE;
 488 }
 489
 490 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 491 {
 492     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 493
 494     gtk_drag_dest_unset( widget );
 495
 496     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 497                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 498
 499     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 500                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 501
 502     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 503                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 504
 505     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 506                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 507 }
 508
 509 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 510 {
 511     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 512
 513     /* gtk_drag_dest_set() determines what default behaviour we'd like
 514        GTK to supply. we don't want to specify out targets (=formats)
 515        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 516        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 517        "drag_motion" and "drag_drop" events. this makes it possible
 518        to allow dropping on only a small area. we should set
 519        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 520        highlighting if dragging over standard controls, but this
 521        seems to be broken without the other two. */
 522
 523     gtk_drag_dest_set( widget,
 524                        (GtkDestDefaults) 0,         /* no default behaviour */
 525                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 526                        0,                           /* number of targets = 0 */
 527                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 528
 529     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 530                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 531
 532     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 533                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 534
 535     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 536                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 537
 538     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 539                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 540 }
 541
 542 //----------------------------------------------------------------------------
 543 // "drag_data_get"
 544 //----------------------------------------------------------------------------
 545
 546 static void
 547 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 548                        GdkDragContext     *WXUNUSED(context),
 549                        GtkSelectionData   *selection_data,
 550                        guint               WXUNUSED(info),
 551                        guint               WXUNUSED(time),
 552                        wxDropSource       *drop_source )
 553 {
 554     if (g_isIdle) wxapp_install_idle_handler();
 555
 556     wxDataFormat format( selection_data->target );
 557
 558     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 559                format.GetId().c_str());
 560
 561     drop_source->m_retValue = wxDragCancel;
 562
 563     wxDataObject *data = drop_source->GetDataObject();
 564
 565     if (!data)
 566     {
 567         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 568         return;
 569     }
 570
 571     if (!data->IsSupportedFormat(format))
 572     {
 573         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 574         return;
 575     }
 576
 577     if (data->GetDataSize(format) == 0)
 578     {
 579         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 580         return;
 581     }
 582
 583     size_t size = data->GetDataSize(format);
 584
 585 //  printf( "data size: %d.\n", (int)data_size );
 586
 587     guchar *d = new guchar[size];
 588
 589     if (!data->GetDataHere( format, (void*)d ))
 590     {
 591         delete[] d;
 592         return;
 593     }
 594
 595 #if wxUSE_THREADS
 596     /* disable GUI threads */
 597 #endif
 598
 599                 gtk_selection_data_set( selection_data,
 600                                         selection_data->target,
 601                                         8,   // 8-bit
 602                                         d,
 603                                         size );
 604
 605 #if wxUSE_THREADS
 606     /* enable GUI threads */
 607 #endif
 608
 609     delete[] d;
 610 }
 611
 612 //----------------------------------------------------------------------------
 613 // "drag_data_delete"
 614 //----------------------------------------------------------------------------
 615
 616 static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
 617                                      GdkDragContext *context,
 618                                      wxDropSource *WXUNUSED(drop_source) )
 619 {
 620     if (g_isIdle)
 621         wxapp_install_idle_handler();
 622
 623     // printf( "Drag source: drag_data_delete\n" );
 624 }
 625
 626 //----------------------------------------------------------------------------
 627 // "drag_begin"
 628 //----------------------------------------------------------------------------
 629
 630 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 631                                GdkDragContext     *WXUNUSED(context),
 632                                wxDropSource       *WXUNUSED(drop_source) )
 633 {
 634     if (g_isIdle)
 635         wxapp_install_idle_handler();
 636
 637     // printf( "Drag source: drag_begin.\n" );
 638 }
 639
 640 //----------------------------------------------------------------------------
 641 // "drag_end"
 642 //----------------------------------------------------------------------------
 643
 644 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 645                              GdkDragContext     *WXUNUSED(context),
 646                              wxDropSource       *drop_source )
 647 {
 648     if (g_isIdle) wxapp_install_idle_handler();
 649
 650     // printf( "Drag source: drag_end.\n" );
 651
 652     drop_source->m_waiting = FALSE;
 653 }
 654
 655 //-----------------------------------------------------------------------------
 656 // "configure_event" from m_iconWindow
 657 //-----------------------------------------------------------------------------
 658
 659 static gint
 660 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 661 {
 662     if (g_isIdle)
 663         wxapp_install_idle_handler();
 664
 665     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 666
 667     return 0;
 668 }
 669
 670 //---------------------------------------------------------------------------
 671 // wxDropSource
 672 //---------------------------------------------------------------------------
 673
 674 wxDropSource::wxDropSource(wxWindow *win,
 675                            const wxIcon &iconCopy,
 676                            const wxIcon &iconMove,
 677                            const wxIcon &iconNone)
 678 {
 679     m_waiting = TRUE;
 680
 681     m_iconWindow = (GtkWidget*) NULL;
 682
 683     m_window = win;
 684     m_widget = win->m_widget;
 685     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 686
 687     m_retValue = wxDragCancel;
 688
 689     SetIcons(iconCopy, iconMove, iconNone);
 690 }
 691
 692 wxDropSource::wxDropSource(wxDataObject& data,
 693                            wxWindow *win,
 694                            const wxIcon &iconCopy,
 695                            const wxIcon &iconMove,
 696                            const wxIcon &iconNone)
 697 {
 698     m_waiting = TRUE;
 699
 700     SetData( data );
 701
 702     m_iconWindow = (GtkWidget*) NULL;
 703
 704     m_window = win;
 705     m_widget = win->m_widget;
 706     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 707
 708     m_retValue = wxDragCancel;
 709
 710     SetIcons(iconCopy, iconMove, iconNone);
 711 }
 712
 713 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 714                             const wxIcon &iconMove,
 715                             const wxIcon &iconNone)
 716 {
 717     m_iconCopy = iconCopy;
 718     m_iconMove = iconMove;
 719     m_iconNone = iconNone;
 720
 721     if ( !m_iconCopy.Ok() )
 722         m_iconCopy = wxIcon(page_xpm);
 723     if ( !m_iconMove.Ok() )
 724         m_iconMove = m_iconCopy;
 725     if ( !m_iconNone.Ok() )
 726         m_iconNone = m_iconCopy;
 727 }
 728
 729 wxDropSource::~wxDropSource()
 730 {
 731 }
 732
 733 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 734 {
 735     // get the right icon to display
 736     wxIcon *icon = NULL;
 737     if ( action & GDK_ACTION_MOVE )
 738         icon = &m_iconMove;
 739     else if ( action & GDK_ACTION_COPY )
 740         icon = &m_iconCopy;
 741     else
 742         icon = &m_iconNone;
 743
 744     GdkBitmap *mask;
 745     if ( icon->GetMask() )
 746         mask = icon->GetMask()->GetBitmap();
 747     else
 748         mask = (GdkBitmap *)NULL;
 749
 750     GdkPixmap *pixmap = icon->GetPixmap();
 751
 752     gint width,height;
 753     gdk_window_get_size (pixmap, &width, &height);
 754
 755     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 756 #ifndef __WXGTK20__
 757     gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
 758 #endif
 759     gtk_widget_push_colormap (colormap);
 760
 761     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 762     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 763     gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
 764
 765 #ifndef __WXGTK20__
 766     gtk_widget_pop_visual ();
 767 #endif
 768     gtk_widget_pop_colormap ();
 769
 770     gtk_widget_set_usize (m_iconWindow, width, height);
 771     gtk_widget_realize (m_iconWindow);
 772
 773     gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
 774         GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
 775
 776     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 777
 778     if (mask)
 779         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 780
 781     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 782 }
 783
 784 wxDragResult wxDropSource::DoDragDrop(int flags)
 785 {
 786     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 787                  wxT("Drop source: no data") );
 788
 789     // still in drag
 790     if (g_blockEventsOnDrag)
 791         return wxDragNone;
 792
 793     // disabled for now
 794     g_blockEventsOnDrag = TRUE;
 795
 796     RegisterWindow();
 797
 798     m_waiting = TRUE;
 799
 800     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 801
 802     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 803     m_data->GetAllFormats( array );
 804     size_t count = m_data->GetFormatCount();
 805     for (size_t i = 0; i < count; i++)
 806     {
 807         GdkAtom atom = array[i];
 808         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 809         gtk_target_list_add( target_list, atom, 0, 0 );
 810     }
 811     delete[] array;
 812
 813     GdkEventMotion event;
 814     event.window = m_widget->window;
 815     int x = 0;
 816     int y = 0;
 817     GdkModifierType state;
 818     gdk_window_get_pointer( event.window, &x, &y, &state );
 819     event.x = x;
 820     event.y = y;
 821     event.state = state;
 822     event.time = (guint32)GDK_CURRENT_TIME;
 823
 824     /* GTK wants to know which button was pressed which caused the dragging */
 825     int button_number = 0;
 826     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 827     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 828     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 829
 830 #if wxUSE_THREADS
 831     /* disable GUI threads */
 832 #endif
 833
 834     /* don't start dragging if no button is down */
 835     if (button_number)
 836     {
 837         int action = GDK_ACTION_COPY;
 838         if ( flags & wxDrag_AllowMove )
 839             action |= GDK_ACTION_MOVE;
 840
 841         // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 842         //     to use a global to pass the flags to the drop target but I'd
 843         //     surely prefer a better way to do it
 844         gs_flagsForDrag = flags;
 845
 846         GdkDragContext *context = gtk_drag_begin( m_widget,
 847                 target_list,
 848                 (GdkDragAction)action,
 849                 button_number,  /* number of mouse button which started drag */
 850                 (GdkEvent*) &event );
 851
 852         m_dragContext = context;
 853
 854         PrepareIcon( action, context );
 855
 856         while (m_waiting)
 857             gtk_main_iteration();
 858
 859         m_retValue = ConvertFromGTK(context->action);
 860         if ( m_retValue == wxDragNone )
 861             m_retValue = wxDragCancel;
 862     }
 863
 864 #if wxUSE_THREADS
 865     /* re-enable GUI threads */
 866 #endif
 867
 868     g_blockEventsOnDrag = FALSE;
 869
 870     UnregisterWindow();
 871
 872     return m_retValue;
 873 }
 874
 875 void wxDropSource::RegisterWindow()
 876 {
 877     if (!m_widget) return;
 878
 879     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 880                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 881     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 882                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 883     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 884                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 885     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 886                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 887
 888 }
 889
 890 void wxDropSource::UnregisterWindow()
 891 {
 892     if (!m_widget) return;
 893
 894     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 895                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 896     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 897                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 898     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 899                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 900     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 901                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 902 }
 903
 904 #endif
 905       // wxUSE_DRAG_AND_DROP