src/gtk/dnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk/dnd.cpp
   3 // Purpose:     wxDropTarget class
   4 // Author:      Robert Roebling
   5 // Copyright:   (c) 1998 Robert Roebling
   6 // Licence:     wxWindows licence
   7 ///////////////////////////////////////////////////////////////////////////////
   8
   9 // For compilers that support precompilation, includes "wx.h".
  10 #include "wx/wxprec.h"
  11
  12 #if wxUSE_DRAG_AND_DROP
  13
  14 #include "wx/dnd.h"
  15
  16 #ifndef WX_PRECOMP
  17     #include "wx/intl.h"
  18     #include "wx/log.h"
  19     #include "wx/app.h"
  20     #include "wx/utils.h"
  21     #include "wx/window.h"
  22     #include "wx/gdicmn.h"
  23 #endif
  24
  25 #include "wx/scopeguard.h"
  26
  27 #include <gtk/gtk.h>
  28 #include "wx/gtk/private/gtk2-compat.h"
  29
  30 //----------------------------------------------------------------------------
  31 // global data
  32 //----------------------------------------------------------------------------
  33
  34 extern bool g_blockEventsOnDrag;
  35
  36 // the flags used for the last DoDragDrop()
  37 static long gs_flagsForDrag = 0;
  38
  39 // the trace mask we use with wxLogTrace() - call
  40 // wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
  41 // (there are quite a few of them, so don't enable this by default)
  42 #define TRACE_DND "dnd"
  43
  44 // global variables because GTK+ DnD want to have the
  45 // mouse event that caused it
  46 extern GdkEvent *g_lastMouseEvent;
  47 extern int       g_lastButtonNumber;
  48
  49 //----------------------------------------------------------------------------
  50 // standard icons
  51 //----------------------------------------------------------------------------
  52
  53 /* Copyright (c) Julian Smart */
  54 static const char * page_xpm[] = {
  55 /* columns rows colors chars-per-pixel */
  56 "32 32 37 1",
  57 "5 c #7198D9",
  58 ", c #769CDA",
  59 "2 c #DCE6F6",
  60 "i c #FFFFFF",
  61 "e c #779DDB",
  62 ": c #9AB6E4",
  63 "9 c #EAF0FA",
  64 "- c #B1C7EB",
  65 "$ c #6992D7",
  66 "y c #F7F9FD",
  67 "= c #BED0EE",
  68 "q c #F0F5FC",
  69 "; c #A8C0E8",
  70 "@ c #366BC2",
  71 "  c None",
  72 "u c #FDFEFF",
  73 "8 c #5987D3",
  74 "* c #C4D5F0",
  75 "7 c #7CA0DC",
  76 "O c #487BCE",
  77 "< c #6B94D7",
  78 "& c #CCDAF2",
  79 "> c #89A9DF",
  80 "3 c #5584D1",
  81 "w c #82A5DE",
  82 "1 c #3F74CB",
  83 "+ c #3A70CA",
  84 ". c #3569BF",
  85 "% c #D2DFF4",
  86 "# c #3366BB",
  87 "r c #F5F8FD",
  88 "0 c #FAFCFE",
  89 "4 c #DFE8F7",
  90 "X c #5E8AD4",
  91 "o c #5282D0",
  92 "t c #B8CCEC",
  93 "6 c #E5EDF9",
  94 /* pixels */
  95 "                                ",
  96 "                                ",
  97 "                                ",
  98 "                                ",
  99 "                                ",
 100 "       .XXXooOO++@#             ",
 101 "       $%&*=-;::>,<1            ",
 102 "       $2%&*=-;::><:3           ",
 103 "       $42%&*=-;::<&:3          ",
 104 "       56477<<<<8<<9&:X         ",
 105 "       59642%&*=-;<09&:5        ",
 106 "       5q9642%&*=-<<<<<#        ",
 107 "       5qqw777<<<<<88:>+        ",
 108 "       erqq9642%&*=t;::+        ",
 109 "       eyrqq9642%&*=t;:O        ",
 110 "       eyywwww777<<<<t;O        ",
 111 "       e0yyrqq9642%&*=to        ",
 112 "       e00yyrqq9642%&*=o        ",
 113 "       eu0wwwwwww777<&*X        ",
 114 "       euu00yyrqq9642%&X        ",
 115 "       eiuu00yyrqq9642%X        ",
 116 "       eiiwwwwwwwwww742$        ",
 117 "       eiiiuu00yyrqq964$        ",
 118 "       eiiiiuu00yyrqq96$        ",
 119 "       eiiiiiuu00yyrqq95        ",
 120 "       eiiiiiiuu00yyrqq5        ",
 121 "       eeeeeeeeeeeeee55e        ",
 122 "                                ",
 123 "                                ",
 124 "                                ",
 125 "                                ",
 126 "                                "
 127 };
 128
 129
 130 // ============================================================================
 131 // private functions
 132 // ============================================================================
 133
 134 // ----------------------------------------------------------------------------
 135 // convert between GTK+ and wxWidgets DND constants
 136 // ----------------------------------------------------------------------------
 137
 138 static wxDragResult ConvertFromGTK(long action)
 139 {
 140     switch ( action )
 141     {
 142         case GDK_ACTION_COPY:
 143             return wxDragCopy;
 144
 145         case GDK_ACTION_LINK:
 146             return wxDragLink;
 147
 148         case GDK_ACTION_MOVE:
 149             return wxDragMove;
 150     }
 151
 152     return wxDragNone;
 153 }
 154
 155 // ----------------------------------------------------------------------------
 156 // "drag_leave"
 157 // ----------------------------------------------------------------------------
 158
 159 extern "C" {
 160 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 161                                GdkDragContext *context,
 162                                guint WXUNUSED(time),
 163                                wxDropTarget *drop_target )
 164 {
 165     /* inform the wxDropTarget about the current GdkDragContext.
 166        this is only valid for the duration of this call */
 167     drop_target->GTKSetDragContext( context );
 168
 169     /* we don't need return values. this event is just for
 170        information */
 171     drop_target->OnLeave();
 172
 173     /* this has to be done because GDK has no "drag_enter" event */
 174     drop_target->m_firstMotion = true;
 175
 176     /* after this, invalidate the drop_target's GdkDragContext */
 177     drop_target->GTKSetDragContext( NULL );
 178 }
 179 }
 180
 181 // ----------------------------------------------------------------------------
 182 // "drag_motion"
 183 // ----------------------------------------------------------------------------
 184
 185 extern "C" {
 186 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 187                                     GdkDragContext *context,
 188                                     gint x,
 189                                     gint y,
 190                                     guint time,
 191                                     wxDropTarget *drop_target )
 192 {
 193     /* Owen Taylor: "if the coordinates not in a drop zone,
 194        return FALSE, otherwise call gtk_drag_status() and
 195        return TRUE" */
 196
 197 #if 0
 198     wxPrintf( "motion\n" );
 199     GList *tmp_list;
 200     for (tmp_list = context->targets; tmp_list; tmp_list = tmp_list->next)
 201     {
 202         wxString atom = wxString::FromAscii( gdk_atom_name (GDK_POINTER_TO_ATOM (tmp_list->data)) );
 203         wxPrintf( "Atom: %s\n", atom );
 204     }
 205 #endif
 206
 207     // Inform the wxDropTarget about the current GdkDragContext.
 208     // This is only valid for the duration of this call.
 209     drop_target->GTKSetDragContext( context );
 210
 211     // Does the source actually accept the data type?
 212     if (drop_target->GTKGetMatchingPair() == (GdkAtom) 0)
 213     {
 214         drop_target->GTKSetDragContext( NULL );
 215         return FALSE;
 216     }
 217
 218     wxDragResult suggested_action = drop_target->GTKFigureOutSuggestedAction();
 219
 220     wxDragResult result = wxDragNone;
 221
 222     if (drop_target->m_firstMotion)
 223     {
 224         // the first "drag_motion" event substitutes a "drag_enter" event
 225         result = drop_target->OnEnter( x, y, suggested_action );
 226     }
 227     else
 228     {
 229         // give program a chance to react (i.e. to say no by returning FALSE)
 230         result = drop_target->OnDragOver( x, y, suggested_action );
 231     }
 232
 233     GdkDragAction result_action = GDK_ACTION_DEFAULT;
 234     if (result == wxDragCopy)
 235         result_action = GDK_ACTION_COPY;
 236     else if (result == wxDragLink)
 237         result_action = GDK_ACTION_LINK;
 238     else
 239         result_action = GDK_ACTION_MOVE;
 240
 241     // is result action actually supported
 242     bool ret = (result_action != GDK_ACTION_DEFAULT) &&
 243                (gdk_drag_context_get_actions(context) & result_action);
 244
 245     if (ret)
 246         gdk_drag_status( context, result_action, time );
 247
 248     // after this, invalidate the drop_target's GdkDragContext
 249     drop_target->GTKSetDragContext( NULL );
 250
 251     // this has to be done because GDK has no "drag_enter" event
 252     drop_target->m_firstMotion = false;
 253
 254     return ret;
 255 }
 256 }
 257
 258 // ----------------------------------------------------------------------------
 259 // "drag_drop"
 260 // ----------------------------------------------------------------------------
 261
 262 extern "C" {
 263 static gboolean target_drag_drop( GtkWidget *widget,
 264                                   GdkDragContext *context,
 265                                   gint x,
 266                                   gint y,
 267                                   guint time,
 268                                   wxDropTarget *drop_target )
 269 {
 270     /* Owen Taylor: "if the drop is not in a drop zone,
 271        return FALSE, otherwise, if you aren't accepting
 272        the drop, call gtk_drag_finish() with success == FALSE
 273        otherwise call gtk_drag_data_get()" */
 274
 275     /* inform the wxDropTarget about the current GdkDragContext.
 276        this is only valid for the duration of this call */
 277     drop_target->GTKSetDragContext( context );
 278
 279     // Does the source actually accept the data type?
 280     if (drop_target->GTKGetMatchingPair() == (GdkAtom) 0)
 281     {
 282         // cancel the whole thing
 283         gtk_drag_finish( context,
 284                           FALSE,        // no success
 285                           FALSE,        // don't delete data on dropping side
 286                           time );
 287
 288         drop_target->GTKSetDragContext( NULL );
 289
 290         drop_target->m_firstMotion = true;
 291
 292         return FALSE;
 293     }
 294
 295     /* inform the wxDropTarget about the current drag widget.
 296        this is only valid for the duration of this call */
 297     drop_target->GTKSetDragWidget( widget );
 298
 299     /* inform the wxDropTarget about the current drag time.
 300        this is only valid for the duration of this call */
 301     drop_target->GTKSetDragTime( time );
 302
 303     /* reset the block here as someone might very well
 304        show a dialog as a reaction to a drop and this
 305        wouldn't work without events */
 306     g_blockEventsOnDrag = false;
 307
 308     bool ret = drop_target->OnDrop( x, y );
 309
 310     if (!ret)
 311     {
 312         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 313
 314         /* cancel the whole thing */
 315         gtk_drag_finish( context,
 316                           FALSE,        /* no success */
 317                           FALSE,        /* don't delete data on dropping side */
 318                           time );
 319     }
 320     else
 321     {
 322         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned true") );
 323
 324         GdkAtom format = drop_target->GTKGetMatchingPair();
 325
 326         // this does happen somehow, see bug 555111
 327         wxCHECK_MSG( format, FALSE, wxT("no matching GdkAtom for format?") );
 328
 329         /* this should trigger an "drag_data_received" event */
 330         gtk_drag_get_data( widget,
 331                            context,
 332                            format,
 333                            time );
 334     }
 335
 336     /* after this, invalidate the drop_target's GdkDragContext */
 337     drop_target->GTKSetDragContext( NULL );
 338
 339     /* after this, invalidate the drop_target's drag widget */
 340     drop_target->GTKSetDragWidget( NULL );
 341
 342     /* this has to be done because GDK has no "drag_enter" event */
 343     drop_target->m_firstMotion = true;
 344
 345     return ret;
 346 }
 347 }
 348
 349 // ----------------------------------------------------------------------------
 350 // "drag_data_received"
 351 // ----------------------------------------------------------------------------
 352
 353 extern "C" {
 354 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 355                                        GdkDragContext *context,
 356                                        gint x,
 357                                        gint y,
 358                                        GtkSelectionData *data,
 359                                        guint WXUNUSED(info),
 360                                        guint time,
 361                                        wxDropTarget *drop_target )
 362 {
 363     /* Owen Taylor: "call gtk_drag_finish() with
 364        success == TRUE" */
 365
 366     if (gtk_selection_data_get_length(data) <= 0 || gtk_selection_data_get_format(data) != 8)
 367     {
 368         /* negative data length and non 8-bit data format
 369            qualifies for junk */
 370         gtk_drag_finish (context, FALSE, FALSE, time);
 371
 372         return;
 373     }
 374
 375     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 376
 377     /* inform the wxDropTarget about the current GtkSelectionData.
 378        this is only valid for the duration of this call */
 379     drop_target->GTKSetDragData( data );
 380
 381     wxDragResult result = ConvertFromGTK(gdk_drag_context_get_selected_action(context));
 382
 383     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 384     {
 385         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned true") );
 386
 387         /* tell GTK that data transfer was successful */
 388         gtk_drag_finish( context, TRUE, FALSE, time );
 389     }
 390     else
 391     {
 392         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 393
 394         /* tell GTK that data transfer was not successful */
 395         gtk_drag_finish( context, FALSE, FALSE, time );
 396     }
 397
 398     /* after this, invalidate the drop_target's drag data */
 399     drop_target->GTKSetDragData( NULL );
 400 }
 401 }
 402
 403 //----------------------------------------------------------------------------
 404 // wxDropTarget
 405 //----------------------------------------------------------------------------
 406
 407 wxDropTarget::wxDropTarget( wxDataObject *data )
 408             : wxDropTargetBase( data )
 409 {
 410     m_firstMotion = true;
 411     m_dragContext = NULL;
 412     m_dragWidget = NULL;
 413     m_dragData = NULL;
 414     m_dragTime = 0;
 415 }
 416
 417 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 418                                        wxCoord WXUNUSED(y),
 419                                        wxDragResult def )
 420 {
 421     return def;
 422 }
 423
 424 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 425 {
 426     return true;
 427 }
 428
 429 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 430                                    wxDragResult def )
 431 {
 432     return GetData() ? def : wxDragNone;
 433 }
 434
 435 wxDragResult wxDropTarget::GTKFigureOutSuggestedAction()
 436 {
 437     if (!m_dragContext)
 438         return wxDragError;
 439
 440     // GTK+ always supposes that we want to copy the data by default while we
 441     // might want to move it, so examine not only suggested_action - which is
 442     // only good if we don't have our own preferences - but also the actions
 443     // field
 444     wxDragResult suggested_action = wxDragNone;
 445     const GdkDragAction actions = gdk_drag_context_get_actions(m_dragContext);
 446     if (GetDefaultAction() == wxDragNone)
 447     {
 448         // use default action set by wxDropSource::DoDragDrop()
 449         if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 450             (actions & GDK_ACTION_MOVE))
 451         {
 452             // move is requested by the program and allowed by GTK+ - do it, even
 453             // though suggested_action may be currently wxDragCopy
 454             suggested_action = wxDragMove;
 455         }
 456         else // use whatever GTK+ says we should
 457         {
 458             suggested_action = ConvertFromGTK(gdk_drag_context_get_suggested_action(m_dragContext));
 459
 460 #if 0
 461             // RR: I don't understand the code below: if the drag comes from
 462             //     a different app, the gs_flagsForDrag is invalid; if it
 463             //     comes from the same wx app, then GTK+ hopefully won't
 464             //     suggest something we didn't allow in the frist place
 465             //     in DoDrop()
 466             if ( (suggested_action == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 467             {
 468                 // we're requested to move but we can't
 469                 suggested_action = wxDragCopy;
 470             }
 471 #endif
 472         }
 473     }
 474     else if (GetDefaultAction() == wxDragMove &&
 475             (actions & GDK_ACTION_MOVE))
 476     {
 477
 478         suggested_action = wxDragMove;
 479     }
 480     else
 481     {
 482         if (actions & GDK_ACTION_COPY)
 483             suggested_action = wxDragCopy;
 484         else if (actions & GDK_ACTION_MOVE)
 485             suggested_action = wxDragMove;
 486         else if (actions & GDK_ACTION_LINK)
 487             suggested_action = wxDragLink;
 488         else
 489             suggested_action = wxDragNone;
 490     }
 491
 492     return suggested_action;
 493 }
 494
 495 wxDataFormat wxDropTarget::GetMatchingPair()
 496 {
 497     return wxDataFormat( GTKGetMatchingPair() );
 498 }
 499
 500 GdkAtom wxDropTarget::GTKGetMatchingPair(bool quiet)
 501 {
 502     if (!m_dataObject)
 503         return (GdkAtom) 0;
 504
 505     if (!m_dragContext)
 506         return (GdkAtom) 0;
 507
 508     const GList* child = gdk_drag_context_list_targets(m_dragContext);
 509     while (child)
 510     {
 511         GdkAtom formatAtom = (GdkAtom)(child->data);
 512         wxDataFormat format( formatAtom );
 513
 514         if ( !quiet )
 515         {
 516             wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 517                        format.GetId().c_str());
 518         }
 519
 520         if (m_dataObject->IsSupportedFormat( format ))
 521             return formatAtom;
 522
 523         child = child->next;
 524     }
 525
 526     return (GdkAtom) 0;
 527 }
 528
 529 bool wxDropTarget::GetData()
 530 {
 531     if (!m_dragData)
 532         return false;
 533
 534     if (!m_dataObject)
 535         return false;
 536
 537     wxDataFormat dragFormat(gtk_selection_data_get_target(m_dragData));
 538
 539     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 540         return false;
 541
 542     m_dataObject->SetData(dragFormat,
 543         (size_t)gtk_selection_data_get_length(m_dragData),
 544         (const void*)gtk_selection_data_get_data(m_dragData));
 545
 546     return true;
 547 }
 548
 549 void wxDropTarget::GtkUnregisterWidget( GtkWidget *widget )
 550 {
 551     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 552
 553     gtk_drag_dest_unset( widget );
 554
 555     g_signal_handlers_disconnect_by_func (widget,
 556                                           (gpointer) target_drag_leave, this);
 557     g_signal_handlers_disconnect_by_func (widget,
 558                                           (gpointer) target_drag_motion, this);
 559     g_signal_handlers_disconnect_by_func (widget,
 560                                           (gpointer) target_drag_drop, this);
 561     g_signal_handlers_disconnect_by_func (widget,
 562                                           (gpointer) target_drag_data_received, this);
 563 }
 564
 565 void wxDropTarget::GtkRegisterWidget( GtkWidget *widget )
 566 {
 567     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 568
 569     /* gtk_drag_dest_set() determines what default behaviour we'd like
 570        GTK to supply. we don't want to specify out targets (=formats)
 571        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 572        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 573        "drag_motion" and "drag_drop" events. this makes it possible
 574        to allow dropping on only a small area. we should set
 575        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 576        highlighting if dragging over standard controls, but this
 577        seems to be broken without the other two. */
 578
 579     gtk_drag_dest_set( widget,
 580                        (GtkDestDefaults) 0,         /* no default behaviour */
 581                        NULL,      /* we don't supply any formats here */
 582                        0,                           /* number of targets = 0 */
 583                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 584
 585     g_signal_connect (widget, "drag_leave",
 586                       G_CALLBACK (target_drag_leave), this);
 587
 588     g_signal_connect (widget, "drag_motion",
 589                       G_CALLBACK (target_drag_motion), this);
 590
 591     g_signal_connect (widget, "drag_drop",
 592                       G_CALLBACK (target_drag_drop), this);
 593
 594     g_signal_connect (widget, "drag_data_received",
 595                       G_CALLBACK (target_drag_data_received), this);
 596 }
 597
 598 //----------------------------------------------------------------------------
 599 // "drag_data_get"
 600 //----------------------------------------------------------------------------
 601
 602 extern "C" {
 603 static void
 604 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 605                        GdkDragContext     *context,
 606                        GtkSelectionData   *selection_data,
 607                        guint               WXUNUSED(info),
 608                        guint               WXUNUSED(time),
 609                        wxDropSource       *drop_source )
 610 {
 611     wxDataFormat format(gtk_selection_data_get_target(selection_data));
 612
 613     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 614                format.GetId().c_str());
 615
 616     drop_source->m_retValue = wxDragError;
 617
 618     wxDataObject *data = drop_source->GetDataObject();
 619
 620     if (!data)
 621     {
 622         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 623         return;
 624     }
 625
 626     if (!data->IsSupportedFormat(format))
 627     {
 628         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 629         return;
 630     }
 631
 632     if (data->GetDataSize(format) == 0)
 633     {
 634         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 635         return;
 636     }
 637
 638     size_t size = data->GetDataSize(format);
 639
 640 //  printf( "data size: %d.\n", (int)data_size );
 641
 642     guchar *d = new guchar[size];
 643
 644     if (!data->GetDataHere( format, (void*)d ))
 645     {
 646         delete[] d;
 647         return;
 648     }
 649
 650     drop_source->m_retValue = ConvertFromGTK(gdk_drag_context_get_selected_action(context));
 651
 652     gtk_selection_data_set( selection_data,
 653                             gtk_selection_data_get_target(selection_data),
 654                             8,   // 8-bit
 655                             d,
 656                             size );
 657
 658     delete[] d;
 659 }
 660 }
 661
 662 //----------------------------------------------------------------------------
 663 // "drag_end"
 664 //----------------------------------------------------------------------------
 665
 666 extern "C" {
 667 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 668                              GdkDragContext     *WXUNUSED(context),
 669                              wxDropSource       *drop_source )
 670 {
 671     drop_source->m_waiting = false;
 672 }
 673 }
 674
 675 //-----------------------------------------------------------------------------
 676 // "configure_event" from m_iconWindow
 677 //-----------------------------------------------------------------------------
 678
 679 extern "C" {
 680 static gint
 681 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 682 {
 683     source->GiveFeedback(ConvertFromGTK(gdk_drag_context_get_selected_action(source->m_dragContext)));
 684
 685     return 0;
 686 }
 687 }
 688
 689 //---------------------------------------------------------------------------
 690 // wxDropSource
 691 //---------------------------------------------------------------------------
 692
 693 wxDropSource::wxDropSource(wxWindow *win,
 694                            const wxIcon &iconCopy,
 695                            const wxIcon &iconMove,
 696                            const wxIcon &iconNone)
 697 {
 698     m_waiting = true;
 699
 700     m_iconWindow = NULL;
 701
 702     m_window = win;
 703     m_widget = win->m_widget;
 704     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 705
 706     m_retValue = wxDragNone;
 707
 708     SetIcons(iconCopy, iconMove, iconNone);
 709 }
 710
 711 wxDropSource::wxDropSource(wxDataObject& data,
 712                            wxWindow *win,
 713                            const wxIcon &iconCopy,
 714                            const wxIcon &iconMove,
 715                            const wxIcon &iconNone)
 716 {
 717     m_waiting = true;
 718
 719     SetData( data );
 720
 721     m_iconWindow = NULL;
 722
 723     m_window = win;
 724     m_widget = win->m_widget;
 725     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 726
 727     m_retValue = wxDragNone;
 728
 729     SetIcons(iconCopy, iconMove, iconNone);
 730 }
 731
 732 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 733                             const wxIcon &iconMove,
 734                             const wxIcon &iconNone)
 735 {
 736     m_iconCopy = iconCopy;
 737     m_iconMove = iconMove;
 738     m_iconNone = iconNone;
 739
 740     if ( !m_iconCopy.IsOk() )
 741         m_iconCopy = wxIcon(page_xpm);
 742     if ( !m_iconMove.IsOk() )
 743         m_iconMove = m_iconCopy;
 744     if ( !m_iconNone.IsOk() )
 745         m_iconNone = m_iconCopy;
 746 }
 747
 748 wxDropSource::~wxDropSource()
 749 {
 750 }
 751
 752 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 753 {
 754     // get the right icon to display
 755     wxIcon *icon = NULL;
 756     if ( action & GDK_ACTION_MOVE )
 757         icon = &m_iconMove;
 758     else if ( action & GDK_ACTION_COPY )
 759         icon = &m_iconCopy;
 760     else
 761         icon = &m_iconNone;
 762
 763 #ifndef __WXGTK3__
 764     GdkBitmap *mask;
 765     if ( icon->GetMask() )
 766         mask = *icon->GetMask();
 767     else
 768         mask = NULL;
 769
 770     GdkPixmap *pixmap = icon->GetPixmap();
 771
 772     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 773     gtk_widget_push_colormap (colormap);
 774 #endif
 775
 776     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 777     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 778     gtk_widget_set_app_paintable (m_iconWindow, TRUE);
 779
 780 #ifdef __WXGTK3__
 781     gtk_widget_set_visual(m_iconWindow, gtk_widget_get_visual(m_widget));
 782 #else
 783     gtk_widget_pop_colormap ();
 784 #endif
 785
 786     gtk_widget_set_size_request (m_iconWindow, icon->GetWidth(), icon->GetHeight());
 787     gtk_widget_realize (m_iconWindow);
 788
 789     g_signal_connect (m_iconWindow, "configure_event",
 790                       G_CALLBACK (gtk_dnd_window_configure_callback), this);
 791
 792 #ifdef __WXGTK3__
 793     cairo_t* cr = gdk_cairo_create(gtk_widget_get_window(m_iconWindow));
 794     icon->SetSourceSurface(cr, 0, 0);
 795     cairo_pattern_t* pattern = cairo_get_source(cr);
 796     gdk_window_set_background_pattern(gtk_widget_get_window(m_iconWindow), pattern);
 797     cairo_destroy(cr);
 798     cairo_surface_t* mask = NULL;
 799     if (icon->GetMask())
 800         mask = *icon->GetMask();
 801     if (mask)
 802     {
 803         cairo_region_t* region = gdk_cairo_region_create_from_surface(mask);
 804         gtk_widget_shape_combine_region(m_iconWindow, region);
 805         cairo_region_destroy(region);
 806     }
 807 #else
 808     gdk_window_set_back_pixmap(gtk_widget_get_window(m_iconWindow), pixmap, false);
 809
 810     if (mask)
 811         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 812 #endif
 813
 814     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 815 }
 816
 817 wxDragResult wxDropSource::DoDragDrop(int flags)
 818 {
 819     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 820                  wxT("Drop source: no data") );
 821
 822     // still in drag
 823     if (g_blockEventsOnDrag)
 824         return wxDragNone;
 825
 826     // don't start dragging if no button is down
 827     if (g_lastButtonNumber == 0)
 828         return wxDragNone;
 829
 830     // we can only start a drag after a mouse event
 831     if (g_lastMouseEvent == NULL)
 832         return wxDragNone;
 833
 834     GTKConnectDragSignals();
 835     wxON_BLOCK_EXIT_OBJ0(*this, wxDropSource::GTKDisconnectDragSignals);
 836
 837     m_waiting = true;
 838
 839     GtkTargetList *target_list = gtk_target_list_new( NULL, 0 );
 840
 841     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 842     m_data->GetAllFormats( array );
 843     size_t count = m_data->GetFormatCount();
 844     for (size_t i = 0; i < count; i++)
 845     {
 846         GdkAtom atom = array[i];
 847         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"),
 848                    gdk_atom_name( atom ));
 849         gtk_target_list_add( target_list, atom, 0, 0 );
 850     }
 851     delete[] array;
 852
 853     int allowed_actions = GDK_ACTION_COPY;
 854     if ( flags & wxDrag_AllowMove )
 855         allowed_actions |= GDK_ACTION_MOVE;
 856
 857     // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 858     //     to use a global to pass the flags to the drop target but I'd
 859     //     surely prefer a better way to do it
 860     gs_flagsForDrag = flags;
 861
 862     m_retValue = wxDragCancel;
 863
 864     GdkDragContext *context = gtk_drag_begin( m_widget,
 865                 target_list,
 866                 (GdkDragAction)allowed_actions,
 867                 g_lastButtonNumber,  // number of mouse button which started drag
 868                 (GdkEvent*) g_lastMouseEvent );
 869
 870     if ( !context )
 871     {
 872         // this can happen e.g. if gdk_pointer_grab() failed
 873         return wxDragError;
 874     }
 875
 876     m_dragContext = context;
 877
 878     PrepareIcon( allowed_actions, context );
 879
 880     while (m_waiting)
 881         gtk_main_iteration();
 882
 883     g_signal_handlers_disconnect_by_func (m_iconWindow,
 884                                           (gpointer) gtk_dnd_window_configure_callback, this);
 885
 886     return m_retValue;
 887 }
 888
 889 void wxDropSource::GTKConnectDragSignals()
 890 {
 891     if (!m_widget)
 892         return;
 893
 894     g_blockEventsOnDrag = true;
 895
 896     g_signal_connect (m_widget, "drag_data_get",
 897                       G_CALLBACK (source_drag_data_get), this);
 898     g_signal_connect (m_widget, "drag_end",
 899                       G_CALLBACK (source_drag_end), this);
 900
 901 }
 902
 903 void wxDropSource::GTKDisconnectDragSignals()
 904 {
 905     if (!m_widget)
 906         return;
 907
 908     g_blockEventsOnDrag = false;
 909
 910     g_signal_handlers_disconnect_by_func (m_widget,
 911                                           (gpointer) source_drag_data_get,
 912                                           this);
 913     g_signal_handlers_disconnect_by_func (m_widget,
 914                                           (gpointer) source_drag_end,
 915                                           this);
 916 }
 917
 918 #endif
 919       // wxUSE_DRAG_AND_DROP