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