src/gtk/dnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk/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 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #if wxUSE_DRAG_AND_DROP
  14
  15 #include "wx/dnd.h"
  16
  17 #ifndef WX_PRECOMP
  18     #include "wx/intl.h"
  19     #include "wx/log.h"
  20     #include "wx/app.h"
  21     #include "wx/utils.h"
  22     #include "wx/window.h"
  23     #include "wx/gdicmn.h"
  24 #endif
  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 // global data
  35 //----------------------------------------------------------------------------
  36
  37 extern bool g_blockEventsOnDrag;
  38
  39 // the flags used for the last DoDragDrop()
  40 static long gs_flagsForDrag = 0;
  41
  42 // the trace mask we use with wxLogTrace() - call
  43 // wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
  44 // (there are quite a few of them, so don't enable this by default)
  45 static const wxChar *TRACE_DND = _T("dnd");
  46
  47 //----------------------------------------------------------------------------
  48 // standard icons
  49 //----------------------------------------------------------------------------
  50
  51 /* Copyright (c) Julian Smart */
  52 static const char * page_xpm[] = {
  53 /* columns rows colors chars-per-pixel */
  54 "32 32 37 1",
  55 "5 c #7198D9",
  56 ", c #769CDA",
  57 "2 c #DCE6F6",
  58 "i c #FFFFFF",
  59 "e c #779DDB",
  60 ": c #9AB6E4",
  61 "9 c #EAF0FA",
  62 "- c #B1C7EB",
  63 "$ c #6992D7",
  64 "y c #F7F9FD",
  65 "= c #BED0EE",
  66 "q c #F0F5FC",
  67 "; c #A8C0E8",
  68 "@ c #366BC2",
  69 "  c None",
  70 "u c #FDFEFF",
  71 "8 c #5987D3",
  72 "* c #C4D5F0",
  73 "7 c #7CA0DC",
  74 "O c #487BCE",
  75 "< c #6B94D7",
  76 "& c #CCDAF2",
  77 "> c #89A9DF",
  78 "3 c #5584D1",
  79 "w c #82A5DE",
  80 "1 c #3F74CB",
  81 "+ c #3A70CA",
  82 ". c #3569BF",
  83 "% c #D2DFF4",
  84 "# c #3366BB",
  85 "r c #F5F8FD",
  86 "0 c #FAFCFE",
  87 "4 c #DFE8F7",
  88 "X c #5E8AD4",
  89 "o c #5282D0",
  90 "t c #B8CCEC",
  91 "6 c #E5EDF9",
  92 /* pixels */
  93 "                                ",
  94 "                                ",
  95 "                                ",
  96 "                                ",
  97 "                                ",
  98 "       .XXXooOO++@#             ",
  99 "       $%&*=-;::>,<1            ",
 100 "       $2%&*=-;::><:3           ",
 101 "       $42%&*=-;::<&:3          ",
 102 "       56477<<<<8<<9&:X         ",
 103 "       59642%&*=-;<09&:5        ",
 104 "       5q9642%&*=-<<<<<#        ",
 105 "       5qqw777<<<<<88:>+        ",
 106 "       erqq9642%&*=t;::+        ",
 107 "       eyrqq9642%&*=t;:O        ",
 108 "       eyywwww777<<<<t;O        ",
 109 "       e0yyrqq9642%&*=to        ",
 110 "       e00yyrqq9642%&*=o        ",
 111 "       eu0wwwwwww777<&*X        ",
 112 "       euu00yyrqq9642%&X        ",
 113 "       eiuu00yyrqq9642%X        ",
 114 "       eiiwwwwwwwwww742$        ",
 115 "       eiiiuu00yyrqq964$        ",
 116 "       eiiiiuu00yyrqq96$        ",
 117 "       eiiiiiuu00yyrqq95        ",
 118 "       eiiiiiiuu00yyrqq5        ",
 119 "       eeeeeeeeeeeeee55e        ",
 120 "                                ",
 121 "                                ",
 122 "                                ",
 123 "                                ",
 124 "                                "
 125 };
 126
 127
 128 // ============================================================================
 129 // private functions
 130 // ============================================================================
 131
 132 // ----------------------------------------------------------------------------
 133 // convert between GTK+ and wxWidgets DND constants
 134 // ----------------------------------------------------------------------------
 135
 136 static wxDragResult ConvertFromGTK(long action)
 137 {
 138     switch ( action )
 139     {
 140         case GDK_ACTION_COPY:
 141             return wxDragCopy;
 142
 143         case GDK_ACTION_LINK:
 144             return wxDragLink;
 145
 146         case GDK_ACTION_MOVE:
 147             return wxDragMove;
 148     }
 149
 150     return wxDragNone;
 151 }
 152
 153 // ----------------------------------------------------------------------------
 154 // "drag_leave"
 155 // ----------------------------------------------------------------------------
 156
 157 extern "C" {
 158 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 159                                GdkDragContext *context,
 160                                guint WXUNUSED(time),
 161                                wxDropTarget *drop_target )
 162 {
 163     if (g_isIdle) wxapp_install_idle_handler();
 164
 165     /* inform the wxDropTarget about the current GdkDragContext.
 166        this is only valid for the duration of this call */
 167     drop_target->SetDragContext( 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->SetDragContext( (GdkDragContext*) 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     if (g_isIdle) wxapp_install_idle_handler();
 194
 195     /* Owen Taylor: "if the coordinates not in a drop zone,
 196        return FALSE, otherwise call gtk_drag_status() and
 197        return TRUE" */
 198
 199     /* inform the wxDropTarget about the current GdkDragContext.
 200        this is only valid for the duration of this call */
 201     drop_target->SetDragContext( context );
 202
 203     // GTK+ always supposes that we want to copy the data by default while we
 204     // might want to move it, so examine not only suggested_action - which is
 205     // only good if we don't have our own preferences - but also the actions
 206     // field
 207     wxDragResult result;
 208     if (drop_target->GetDefaultAction() == wxDragNone)
 209     {
 210         // use default action set by wxDropSource::DoDragDrop()
 211     if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 212             (context->actions & GDK_ACTION_MOVE ) )
 213     {
 214         // move is requested by the program and allowed by GTK+ - do it, even
 215         // though suggested_action may be currently wxDragCopy
 216         result = wxDragMove;
 217     }
 218     else // use whatever GTK+ says we should
 219     {
 220         result = ConvertFromGTK(context->suggested_action);
 221
 222         if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 223         {
 224             // we're requested to move but we can't
 225             result = wxDragCopy;
 226         }
 227     }
 228     }
 229     else if (drop_target->GetDefaultAction() == wxDragMove &&
 230                 (context->actions & GDK_ACTION_MOVE))
 231     {
 232        result = wxDragMove;
 233     }
 234     else
 235     {
 236         if (context->actions & GDK_ACTION_COPY)
 237             result = wxDragCopy;
 238         else if (context->actions & GDK_ACTION_MOVE)
 239             result = wxDragMove;
 240         else
 241             result = wxDragNone;
 242     }
 243
 244     if (drop_target->m_firstMotion)
 245     {
 246         /* the first "drag_motion" event substitutes a "drag_enter" event */
 247         result = drop_target->OnEnter( x, y, result );
 248     }
 249     else
 250     {
 251         /* give program a chance to react (i.e. to say no by returning FALSE) */
 252         result = drop_target->OnDragOver( x, y, result );
 253     }
 254
 255     bool ret = wxIsDragResultOk( result );
 256     if (ret)
 257     {
 258         GdkDragAction action;
 259         if (result == wxDragCopy)
 260             action = GDK_ACTION_COPY;
 261         else if (result == wxDragLink)
 262             action = GDK_ACTION_LINK;
 263         else
 264             action = GDK_ACTION_MOVE;
 265
 266         gdk_drag_status( context, action, time );
 267     }
 268
 269     /* after this, invalidate the drop_target's GdkDragContext */
 270     drop_target->SetDragContext( (GdkDragContext*) NULL );
 271
 272     /* this has to be done because GDK has no "drag_enter" event */
 273     drop_target->m_firstMotion = false;
 274
 275     return ret;
 276 }
 277 }
 278
 279 // ----------------------------------------------------------------------------
 280 // "drag_drop"
 281 // ----------------------------------------------------------------------------
 282
 283 extern "C" {
 284 static gboolean target_drag_drop( GtkWidget *widget,
 285                                   GdkDragContext *context,
 286                                   gint x,
 287                                   gint y,
 288                                   guint time,
 289                                   wxDropTarget *drop_target )
 290 {
 291     if (g_isIdle) wxapp_install_idle_handler();
 292
 293     /* Owen Taylor: "if the drop is not in a drop zone,
 294        return FALSE, otherwise, if you aren't accepting
 295        the drop, call gtk_drag_finish() with success == FALSE
 296        otherwise call gtk_drag_data_get()" */
 297
 298 //    printf( "drop.\n" );
 299
 300     /* this seems to make a difference between not accepting
 301        due to wrong target area and due to wrong format. let
 302        us hope that this is not required.. */
 303
 304     /* inform the wxDropTarget about the current GdkDragContext.
 305        this is only valid for the duration of this call */
 306     drop_target->SetDragContext( context );
 307
 308     /* inform the wxDropTarget about the current drag widget.
 309        this is only valid for the duration of this call */
 310     drop_target->SetDragWidget( widget );
 311
 312     /* inform the wxDropTarget about the current drag time.
 313        this is only valid for the duration of this call */
 314     drop_target->SetDragTime( time );
 315
 316 /*
 317     wxDragResult result = wxDragMove;
 318     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 319 */
 320
 321     /* reset the block here as someone might very well
 322        show a dialog as a reaction to a drop and this
 323        wouldn't work without events */
 324     g_blockEventsOnDrag = false;
 325
 326     bool ret = drop_target->OnDrop( x, y );
 327
 328     if (!ret)
 329     {
 330         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 331
 332         /* cancel the whole thing */
 333         gtk_drag_finish( context,
 334                           FALSE,        /* no success */
 335                           FALSE,        /* don't delete data on dropping side */
 336                           time );
 337     }
 338     else
 339     {
 340         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned true") );
 341
 342 #if wxUSE_THREADS
 343         /* disable GUI threads */
 344 #endif
 345
 346         GdkAtom format = drop_target->GetMatchingPair();
 347
 348         // this does happen somehow, see bug 555111
 349         wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") );
 350
 351 /*
 352         GdkDragAction action = GDK_ACTION_MOVE;
 353         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 354         context->action = action;
 355 */
 356         /* this should trigger an "drag_data_received" event */
 357         gtk_drag_get_data( widget,
 358                            context,
 359                            format,
 360                            time );
 361
 362 #if wxUSE_THREADS
 363         /* re-enable GUI threads */
 364 #endif
 365     }
 366
 367     /* after this, invalidate the drop_target's GdkDragContext */
 368     drop_target->SetDragContext( (GdkDragContext*) NULL );
 369
 370     /* after this, invalidate the drop_target's drag widget */
 371     drop_target->SetDragWidget( (GtkWidget*) NULL );
 372
 373     /* this has to be done because GDK has no "drag_enter" event */
 374     drop_target->m_firstMotion = true;
 375
 376     return ret;
 377 }
 378 }
 379
 380 // ----------------------------------------------------------------------------
 381 // "drag_data_received"
 382 // ----------------------------------------------------------------------------
 383
 384 extern "C" {
 385 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 386                                        GdkDragContext *context,
 387                                        gint x,
 388                                        gint y,
 389                                        GtkSelectionData *data,
 390                                        guint WXUNUSED(info),
 391                                        guint time,
 392                                        wxDropTarget *drop_target )
 393 {
 394     if (g_isIdle) wxapp_install_idle_handler();
 395
 396     /* Owen Taylor: "call gtk_drag_finish() with
 397        success == TRUE" */
 398
 399     if ((data->length <= 0) || (data->format != 8))
 400     {
 401         /* negative data length and non 8-bit data format
 402            qualifies for junk */
 403         gtk_drag_finish (context, FALSE, FALSE, time);
 404
 405         return;
 406     }
 407
 408     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 409
 410     /* inform the wxDropTarget about the current GtkSelectionData.
 411        this is only valid for the duration of this call */
 412     drop_target->SetDragData( data );
 413
 414     wxDragResult result = ConvertFromGTK(context->action);
 415
 416     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 417     {
 418         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned true") );
 419
 420         /* tell GTK that data transfer was successful */
 421         gtk_drag_finish( context, TRUE, FALSE, time );
 422     }
 423     else
 424     {
 425         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 426
 427         /* tell GTK that data transfer was not successful */
 428         gtk_drag_finish( context, FALSE, FALSE, time );
 429     }
 430
 431     /* after this, invalidate the drop_target's drag data */
 432     drop_target->SetDragData( (GtkSelectionData*) NULL );
 433 }
 434 }
 435
 436 //----------------------------------------------------------------------------
 437 // wxDropTarget
 438 //----------------------------------------------------------------------------
 439
 440 wxDropTarget::wxDropTarget( wxDataObject *data )
 441             : wxDropTargetBase( data )
 442 {
 443     m_firstMotion = true;
 444     m_dragContext = (GdkDragContext*) NULL;
 445     m_dragWidget = (GtkWidget*) NULL;
 446     m_dragData = (GtkSelectionData*) NULL;
 447     m_dragTime = 0;
 448 }
 449
 450 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 451                                        wxCoord WXUNUSED(y),
 452                                        wxDragResult def )
 453 {
 454     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 455
 456     // disable the debug message from GetMatchingPair() - there are too many
 457     // of them otherwise
 458 #ifdef __WXDEBUG__
 459     wxLogNull noLog;
 460 #endif // Debug
 461
 462     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 463 }
 464
 465 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 466 {
 467     if (!m_dataObject)
 468         return false;
 469
 470     return (GetMatchingPair() != (GdkAtom) 0);
 471 }
 472
 473 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 474                                    wxDragResult def )
 475 {
 476     if (!m_dataObject)
 477         return wxDragNone;
 478
 479     if (GetMatchingPair() == (GdkAtom) 0)
 480         return wxDragNone;
 481
 482     return GetData() ? def : wxDragNone;
 483 }
 484
 485 GdkAtom wxDropTarget::GetMatchingPair()
 486 {
 487     if (!m_dataObject)
 488         return (GdkAtom) 0;
 489
 490     if (!m_dragContext)
 491         return (GdkAtom) 0;
 492
 493     GList *child = m_dragContext->targets;
 494     while (child)
 495     {
 496         GdkAtom formatAtom = (GdkAtom)(child->data);
 497         wxDataFormat format( formatAtom );
 498
 499 #ifdef __WXDEBUG__
 500         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 501                    format.GetId().c_str());
 502 #endif // Debug
 503
 504         if (m_dataObject->IsSupportedFormat( format ))
 505             return formatAtom;
 506
 507         child = child->next;
 508     }
 509
 510     return (GdkAtom) 0;
 511 }
 512
 513 bool wxDropTarget::GetData()
 514 {
 515     if (!m_dragData)
 516         return false;
 517
 518     if (!m_dataObject)
 519         return false;
 520
 521     wxDataFormat dragFormat( m_dragData->target );
 522
 523     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 524         return false;
 525
 526     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 527
 528     return true;
 529 }
 530
 531 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 532 {
 533     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 534
 535     gtk_drag_dest_unset( widget );
 536
 537     g_signal_handlers_disconnect_by_func (widget,
 538                                           (gpointer) target_drag_leave, this);
 539     g_signal_handlers_disconnect_by_func (widget,
 540                                           (gpointer) target_drag_motion, this);
 541     g_signal_handlers_disconnect_by_func (widget,
 542                                           (gpointer) target_drag_drop, this);
 543     g_signal_handlers_disconnect_by_func (widget,
 544                                           (gpointer) target_drag_data_received, this);
 545 }
 546
 547 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 548 {
 549     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 550
 551     /* gtk_drag_dest_set() determines what default behaviour we'd like
 552        GTK to supply. we don't want to specify out targets (=formats)
 553        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 554        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 555        "drag_motion" and "drag_drop" events. this makes it possible
 556        to allow dropping on only a small area. we should set
 557        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 558        highlighting if dragging over standard controls, but this
 559        seems to be broken without the other two. */
 560
 561     gtk_drag_dest_set( widget,
 562                        (GtkDestDefaults) 0,         /* no default behaviour */
 563                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 564                        0,                           /* number of targets = 0 */
 565                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 566
 567     g_signal_connect (widget, "drag_leave",
 568                       G_CALLBACK (target_drag_leave), this);
 569
 570     g_signal_connect (widget, "drag_motion",
 571                       G_CALLBACK (target_drag_motion), this);
 572
 573     g_signal_connect (widget, "drag_drop",
 574                       G_CALLBACK (target_drag_drop), this);
 575
 576     g_signal_connect (widget, "drag_data_received",
 577                       G_CALLBACK (target_drag_data_received), this);
 578 }
 579
 580 //----------------------------------------------------------------------------
 581 // "drag_data_get"
 582 //----------------------------------------------------------------------------
 583
 584 extern "C" {
 585 static void
 586 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 587                        GdkDragContext     *WXUNUSED(context),
 588                        GtkSelectionData   *selection_data,
 589                        guint               WXUNUSED(info),
 590                        guint               WXUNUSED(time),
 591                        wxDropSource       *drop_source )
 592 {
 593     if (g_isIdle) wxapp_install_idle_handler();
 594
 595     wxDataFormat format( selection_data->target );
 596
 597     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 598                format.GetId().c_str());
 599
 600     drop_source->m_retValue = wxDragCancel;
 601
 602     wxDataObject *data = drop_source->GetDataObject();
 603
 604     if (!data)
 605     {
 606         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 607         return;
 608     }
 609
 610     if (!data->IsSupportedFormat(format))
 611     {
 612         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 613         return;
 614     }
 615
 616     if (data->GetDataSize(format) == 0)
 617     {
 618         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 619         return;
 620     }
 621
 622     size_t size = data->GetDataSize(format);
 623
 624 //  printf( "data size: %d.\n", (int)data_size );
 625
 626     guchar *d = new guchar[size];
 627
 628     if (!data->GetDataHere( format, (void*)d ))
 629     {
 630         delete[] d;
 631         return;
 632     }
 633
 634 #if wxUSE_THREADS
 635     /* disable GUI threads */
 636 #endif
 637
 638     gtk_selection_data_set( selection_data,
 639                             selection_data->target,
 640                             8,   // 8-bit
 641                             d,
 642                             size );
 643
 644 #if wxUSE_THREADS
 645     /* enable GUI threads */
 646 #endif
 647
 648     delete[] d;
 649 }
 650 }
 651
 652 //----------------------------------------------------------------------------
 653 // "drag_data_delete"
 654 //----------------------------------------------------------------------------
 655
 656 extern "C" {
 657 static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
 658                                      GdkDragContext *context,
 659                                      wxDropSource *WXUNUSED(drop_source) )
 660 {
 661     if (g_isIdle)
 662         wxapp_install_idle_handler();
 663
 664     // printf( "Drag source: drag_data_delete\n" );
 665 }
 666 }
 667
 668 //----------------------------------------------------------------------------
 669 // "drag_begin"
 670 //----------------------------------------------------------------------------
 671
 672 extern "C" {
 673 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 674                                GdkDragContext     *WXUNUSED(context),
 675                                wxDropSource       *WXUNUSED(drop_source) )
 676 {
 677     if (g_isIdle)
 678         wxapp_install_idle_handler();
 679
 680     // printf( "Drag source: drag_begin.\n" );
 681 }
 682 }
 683
 684 //----------------------------------------------------------------------------
 685 // "drag_end"
 686 //----------------------------------------------------------------------------
 687
 688 extern "C" {
 689 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 690                              GdkDragContext     *WXUNUSED(context),
 691                              wxDropSource       *drop_source )
 692 {
 693     if (g_isIdle) wxapp_install_idle_handler();
 694
 695     // printf( "Drag source: drag_end.\n" );
 696
 697     drop_source->m_waiting = false;
 698 }
 699 }
 700
 701 //-----------------------------------------------------------------------------
 702 // "configure_event" from m_iconWindow
 703 //-----------------------------------------------------------------------------
 704
 705 extern "C" {
 706 static gint
 707 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 708 {
 709     // don't need to install idle handler, its done from "event" signal
 710
 711     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 712
 713     return 0;
 714 }
 715 }
 716
 717 //---------------------------------------------------------------------------
 718 // wxDropSource
 719 //---------------------------------------------------------------------------
 720
 721 wxDropSource::wxDropSource(wxWindow *win,
 722                            const wxIcon &iconCopy,
 723                            const wxIcon &iconMove,
 724                            const wxIcon &iconNone)
 725 {
 726     m_waiting = true;
 727
 728     m_iconWindow = (GtkWidget*) NULL;
 729
 730     m_window = win;
 731     m_widget = win->m_widget;
 732     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 733
 734     m_retValue = wxDragCancel;
 735
 736     SetIcons(iconCopy, iconMove, iconNone);
 737 }
 738
 739 wxDropSource::wxDropSource(wxDataObject& data,
 740                            wxWindow *win,
 741                            const wxIcon &iconCopy,
 742                            const wxIcon &iconMove,
 743                            const wxIcon &iconNone)
 744 {
 745     m_waiting = true;
 746
 747     SetData( data );
 748
 749     m_iconWindow = (GtkWidget*) NULL;
 750
 751     m_window = win;
 752     m_widget = win->m_widget;
 753     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 754
 755     m_retValue = wxDragCancel;
 756
 757     SetIcons(iconCopy, iconMove, iconNone);
 758 }
 759
 760 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 761                             const wxIcon &iconMove,
 762                             const wxIcon &iconNone)
 763 {
 764     m_iconCopy = iconCopy;
 765     m_iconMove = iconMove;
 766     m_iconNone = iconNone;
 767
 768     if ( !m_iconCopy.Ok() )
 769         m_iconCopy = wxIcon(page_xpm);
 770     if ( !m_iconMove.Ok() )
 771         m_iconMove = m_iconCopy;
 772     if ( !m_iconNone.Ok() )
 773         m_iconNone = m_iconCopy;
 774 }
 775
 776 wxDropSource::~wxDropSource()
 777 {
 778 }
 779
 780 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 781 {
 782     // get the right icon to display
 783     wxIcon *icon = NULL;
 784     if ( action & GDK_ACTION_MOVE )
 785         icon = &m_iconMove;
 786     else if ( action & GDK_ACTION_COPY )
 787         icon = &m_iconCopy;
 788     else
 789         icon = &m_iconNone;
 790
 791     GdkBitmap *mask;
 792     if ( icon->GetMask() )
 793         mask = icon->GetMask()->GetBitmap();
 794     else
 795         mask = (GdkBitmap *)NULL;
 796
 797     GdkPixmap *pixmap = icon->GetPixmap();
 798
 799     gint width,height;
 800     gdk_drawable_get_size (pixmap, &width, &height);
 801
 802     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 803     gtk_widget_push_colormap (colormap);
 804
 805     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 806     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 807     gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
 808
 809     gtk_widget_pop_colormap ();
 810
 811     gtk_widget_set_size_request (m_iconWindow, width, height);
 812     gtk_widget_realize (m_iconWindow);
 813
 814     g_signal_connect (m_iconWindow, "configure_event",
 815                       G_CALLBACK (gtk_dnd_window_configure_callback), this);
 816
 817     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 818
 819     if (mask)
 820         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 821
 822     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 823 }
 824
 825 wxDragResult wxDropSource::DoDragDrop(int flags)
 826 {
 827     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 828                  wxT("Drop source: no data") );
 829
 830     // still in drag
 831     if (g_blockEventsOnDrag)
 832         return wxDragNone;
 833
 834     // disabled for now
 835     g_blockEventsOnDrag = true;
 836
 837     RegisterWindow();
 838
 839     m_waiting = true;
 840
 841     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 842
 843     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 844     m_data->GetAllFormats( array );
 845     size_t count = m_data->GetFormatCount();
 846     for (size_t i = 0; i < count; i++)
 847     {
 848         GdkAtom atom = array[i];
 849         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 850         gtk_target_list_add( target_list, atom, 0, 0 );
 851     }
 852     delete[] array;
 853
 854     GdkEventMotion event;
 855     event.window = m_widget->window;
 856     int x = 0;
 857     int y = 0;
 858     GdkModifierType state;
 859     gdk_window_get_pointer( event.window, &x, &y, &state );
 860     event.x = x;
 861     event.y = y;
 862     event.state = state;
 863     event.time = (guint32)GDK_CURRENT_TIME;
 864
 865     /* GTK wants to know which button was pressed which caused the dragging */
 866     int button_number = 0;
 867     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 868     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 869     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 870
 871 #if wxUSE_THREADS
 872     /* disable GUI threads */
 873 #endif
 874
 875     /* don't start dragging if no button is down */
 876     if (button_number)
 877     {
 878         int action = GDK_ACTION_COPY;
 879         if ( flags & wxDrag_AllowMove )
 880             action |= GDK_ACTION_MOVE;
 881
 882         // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 883         //     to use a global to pass the flags to the drop target but I'd
 884         //     surely prefer a better way to do it
 885         gs_flagsForDrag = flags;
 886
 887         GdkDragContext *context = gtk_drag_begin( m_widget,
 888                 target_list,
 889                 (GdkDragAction)action,
 890                 button_number,  /* number of mouse button which started drag */
 891                 (GdkEvent*) &event );
 892
 893         m_dragContext = context;
 894
 895         PrepareIcon( action, context );
 896
 897         while (m_waiting)
 898             gtk_main_iteration();
 899
 900         m_retValue = ConvertFromGTK(context->action);
 901         if ( m_retValue == wxDragNone )
 902             m_retValue = wxDragCancel;
 903     }
 904
 905 #if wxUSE_THREADS
 906     /* re-enable GUI threads */
 907 #endif
 908
 909     g_blockEventsOnDrag = false;
 910
 911     UnregisterWindow();
 912
 913     // this shouldn't be needed but somehow, sometimes, without this the cursor
 914     // stays grabbed even when the DND operation ends and the application
 915     // becomes unresponsive and has to be killed resulting in loss of all
 916     // unsaved data, so while this fix is ugly it's still better than
 917     // alternative
 918     if ( gdk_pointer_is_grabbed() )
 919         gdk_pointer_ungrab(GDK_CURRENT_TIME);
 920
 921     return m_retValue;
 922 }
 923
 924 void wxDropSource::RegisterWindow()
 925 {
 926     if (!m_widget) return;
 927
 928     g_signal_connect (m_widget, "drag_data_get",
 929                       G_CALLBACK (source_drag_data_get), this);
 930     g_signal_connect (m_widget, "drag_data_delete",
 931                       G_CALLBACK (source_drag_data_delete), this);
 932     g_signal_connect (m_widget, "drag_begin",
 933                       G_CALLBACK (source_drag_begin), this);
 934     g_signal_connect (m_widget, "drag_end",
 935                       G_CALLBACK (source_drag_end), this);
 936
 937 }
 938
 939 void wxDropSource::UnregisterWindow()
 940 {
 941     if (!m_widget)
 942         return;
 943
 944     g_signal_handlers_disconnect_by_func (m_widget,
 945                                           (gpointer) source_drag_data_get,
 946                                           this);
 947     g_signal_handlers_disconnect_by_func (m_widget,
 948                                           (gpointer) source_drag_data_delete,
 949                                           this);
 950     g_signal_handlers_disconnect_by_func (m_widget,
 951                                           (gpointer) source_drag_begin,
 952                                           this);
 953     g_signal_handlers_disconnect_by_func (m_widget,
 954                                           (gpointer) source_drag_end,
 955                                           this);
 956 }
 957
 958 #endif
 959       // wxUSE_DRAG_AND_DROP