src/gtk1/dnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk1/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/gtk1/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 #define TRACE_DND _T("dnd")
  60
  61 // global variables because GTK+ DnD want to have the
  62 // mouse event that caused it
  63 extern GdkEvent *g_lastMouseEvent;
  64 extern int g_lastButtonNumber;
  65
  66 //----------------------------------------------------------------------------
  67 // standard icons
  68 //----------------------------------------------------------------------------
  69
  70 /* Copyright (c) Julian Smart */
  71 static const char * page_xpm[] = {
  72 /* columns rows colors chars-per-pixel */
  73 "32 32 37 1",
  74 "5 c #7198D9",
  75 ", c #769CDA",
  76 "2 c #DCE6F6",
  77 "i c #FFFFFF",
  78 "e c #779DDB",
  79 ": c #9AB6E4",
  80 "9 c #EAF0FA",
  81 "- c #B1C7EB",
  82 "$ c #6992D7",
  83 "y c #F7F9FD",
  84 "= c #BED0EE",
  85 "q c #F0F5FC",
  86 "; c #A8C0E8",
  87 "@ c #366BC2",
  88 "  c None",
  89 "u c #FDFEFF",
  90 "8 c #5987D3",
  91 "* c #C4D5F0",
  92 "7 c #7CA0DC",
  93 "O c #487BCE",
  94 "< c #6B94D7",
  95 "& c #CCDAF2",
  96 "> c #89A9DF",
  97 "3 c #5584D1",
  98 "w c #82A5DE",
  99 "1 c #3F74CB",
 100 "+ c #3A70CA",
 101 ". c #3569BF",
 102 "% c #D2DFF4",
 103 "# c #3366BB",
 104 "r c #F5F8FD",
 105 "0 c #FAFCFE",
 106 "4 c #DFE8F7",
 107 "X c #5E8AD4",
 108 "o c #5282D0",
 109 "t c #B8CCEC",
 110 "6 c #E5EDF9",
 111 /* pixels */
 112 "                                ",
 113 "                                ",
 114 "                                ",
 115 "                                ",
 116 "                                ",
 117 "       .XXXooOO++@#             ",
 118 "       $%&*=-;::>,<1            ",
 119 "       $2%&*=-;::><:3           ",
 120 "       $42%&*=-;::<&:3          ",
 121 "       56477<<<<8<<9&:X         ",
 122 "       59642%&*=-;<09&:5        ",
 123 "       5q9642%&*=-<<<<<#        ",
 124 "       5qqw777<<<<<88:>+        ",
 125 "       erqq9642%&*=t;::+        ",
 126 "       eyrqq9642%&*=t;:O        ",
 127 "       eyywwww777<<<<t;O        ",
 128 "       e0yyrqq9642%&*=to        ",
 129 "       e00yyrqq9642%&*=o        ",
 130 "       eu0wwwwwww777<&*X        ",
 131 "       euu00yyrqq9642%&X        ",
 132 "       eiuu00yyrqq9642%X        ",
 133 "       eiiwwwwwwwwww742$        ",
 134 "       eiiiuu00yyrqq964$        ",
 135 "       eiiiiuu00yyrqq96$        ",
 136 "       eiiiiiuu00yyrqq95        ",
 137 "       eiiiiiiuu00yyrqq5        ",
 138 "       eeeeeeeeeeeeee55e        ",
 139 "                                ",
 140 "                                ",
 141 "                                ",
 142 "                                ",
 143 "                                "
 144 };
 145
 146
 147 // ============================================================================
 148 // private functions
 149 // ============================================================================
 150
 151 // ----------------------------------------------------------------------------
 152 // convert between GTK+ and wxWidgets DND constants
 153 // ----------------------------------------------------------------------------
 154
 155 static wxDragResult ConvertFromGTK(long action)
 156 {
 157     switch ( action )
 158     {
 159         case GDK_ACTION_COPY:
 160             return wxDragCopy;
 161
 162         case GDK_ACTION_LINK:
 163             return wxDragLink;
 164
 165         case GDK_ACTION_MOVE:
 166             return wxDragMove;
 167     }
 168
 169     return wxDragNone;
 170 }
 171
 172 // ----------------------------------------------------------------------------
 173 // "drag_leave"
 174 // ----------------------------------------------------------------------------
 175
 176 extern "C" {
 177 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 178                                GdkDragContext *context,
 179                                guint WXUNUSED(time),
 180                                wxDropTarget *drop_target )
 181 {
 182     if (g_isIdle) wxapp_install_idle_handler();
 183
 184     /* inform the wxDropTarget about the current GdkDragContext.
 185        this is only valid for the duration of this call */
 186     drop_target->SetDragContext( context );
 187
 188     /* we don't need return values. this event is just for
 189        information */
 190     drop_target->OnLeave();
 191
 192     /* this has to be done because GDK has no "drag_enter" event */
 193     drop_target->m_firstMotion = true;
 194
 195     /* after this, invalidate the drop_target's GdkDragContext */
 196     drop_target->SetDragContext( (GdkDragContext*) NULL );
 197 }
 198 }
 199
 200 // ----------------------------------------------------------------------------
 201 // "drag_motion"
 202 // ----------------------------------------------------------------------------
 203
 204 extern "C" {
 205 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 206                                     GdkDragContext *context,
 207                                     gint x,
 208                                     gint y,
 209                                     guint time,
 210                                     wxDropTarget *drop_target )
 211 {
 212     if (g_isIdle) wxapp_install_idle_handler();
 213
 214     /* Owen Taylor: "if the coordinates not in a drop zone,
 215        return FALSE, otherwise call gtk_drag_status() and
 216        return TRUE" */
 217
 218     /* inform the wxDropTarget about the current GdkDragContext.
 219        this is only valid for the duration of this call */
 220     drop_target->SetDragContext( context );
 221
 222     // GTK+ always supposes that we want to copy the data by default while we
 223     // might want to move it, so examine not only suggested_action - which is
 224     // only good if we don't have our own preferences - but also the actions
 225     // field
 226     wxDragResult result;
 227     if (drop_target->GetDefaultAction() == wxDragNone)
 228     {
 229         // use default action set by wxDropSource::DoDragDrop()
 230     if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 231             (context->actions & GDK_ACTION_MOVE ) )
 232     {
 233         // move is requested by the program and allowed by GTK+ - do it, even
 234         // though suggested_action may be currently wxDragCopy
 235         result = wxDragMove;
 236     }
 237     else // use whatever GTK+ says we should
 238     {
 239         result = ConvertFromGTK(context->suggested_action);
 240
 241         if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 242         {
 243             // we're requested to move but we can't
 244             result = wxDragCopy;
 245         }
 246     }
 247     }
 248     else if (drop_target->GetDefaultAction() == wxDragMove &&
 249                 (context->actions & GDK_ACTION_MOVE))
 250     {
 251        result = wxDragMove;
 252     }
 253     else
 254     {
 255         if (context->actions & GDK_ACTION_COPY)
 256             result = wxDragCopy;
 257         else if (context->actions & GDK_ACTION_MOVE)
 258             result = wxDragMove;
 259         else
 260             result = wxDragNone;
 261     }
 262
 263     if (drop_target->m_firstMotion)
 264     {
 265         /* the first "drag_motion" event substitutes a "drag_enter" event */
 266         result = drop_target->OnEnter( x, y, result );
 267     }
 268     else
 269     {
 270         /* give program a chance to react (i.e. to say no by returning FALSE) */
 271         result = drop_target->OnDragOver( x, y, result );
 272     }
 273
 274     bool ret = wxIsDragResultOk( result );
 275     if (ret)
 276     {
 277         GdkDragAction action;
 278         if (result == wxDragCopy)
 279             action = GDK_ACTION_COPY;
 280         else if (result == wxDragLink)
 281             action = GDK_ACTION_LINK;
 282         else
 283             action = GDK_ACTION_MOVE;
 284
 285         gdk_drag_status( context, action, time );
 286     }
 287
 288     /* after this, invalidate the drop_target's GdkDragContext */
 289     drop_target->SetDragContext( (GdkDragContext*) NULL );
 290
 291     /* this has to be done because GDK has no "drag_enter" event */
 292     drop_target->m_firstMotion = false;
 293
 294     return ret;
 295 }
 296 }
 297
 298 // ----------------------------------------------------------------------------
 299 // "drag_drop"
 300 // ----------------------------------------------------------------------------
 301
 302 extern "C" {
 303 static gboolean target_drag_drop( GtkWidget *widget,
 304                                   GdkDragContext *context,
 305                                   gint x,
 306                                   gint y,
 307                                   guint time,
 308                                   wxDropTarget *drop_target )
 309 {
 310     if (g_isIdle) wxapp_install_idle_handler();
 311
 312     /* Owen Taylor: "if the drop is not in a drop zone,
 313        return FALSE, otherwise, if you aren't accepting
 314        the drop, call gtk_drag_finish() with success == FALSE
 315        otherwise call gtk_drag_data_get()" */
 316
 317 //    printf( "drop.\n" );
 318
 319     /* this seems to make a difference between not accepting
 320        due to wrong target area and due to wrong format. let
 321        us hope that this is not required.. */
 322
 323     /* inform the wxDropTarget about the current GdkDragContext.
 324        this is only valid for the duration of this call */
 325     drop_target->SetDragContext( context );
 326
 327     /* inform the wxDropTarget about the current drag widget.
 328        this is only valid for the duration of this call */
 329     drop_target->SetDragWidget( widget );
 330
 331     /* inform the wxDropTarget about the current drag time.
 332        this is only valid for the duration of this call */
 333     drop_target->SetDragTime( time );
 334
 335 /*
 336     wxDragResult result = wxDragMove;
 337     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 338 */
 339
 340     /* reset the block here as someone might very well
 341        show a dialog as a reaction to a drop and this
 342        wouldn't work without events */
 343     g_blockEventsOnDrag = false;
 344
 345     bool ret = drop_target->OnDrop( x, y );
 346
 347     if (!ret)
 348     {
 349         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 350
 351         /* cancel the whole thing */
 352         gtk_drag_finish( context,
 353                           FALSE,        /* no success */
 354                           FALSE,        /* don't delete data on dropping side */
 355                           time );
 356     }
 357     else
 358     {
 359         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned TRUE") );
 360
 361 #if wxUSE_THREADS
 362         /* disable GUI threads */
 363 #endif
 364
 365         GdkAtom format = drop_target->GetMatchingPair();
 366
 367         // this does happen somehow, see bug 555111
 368         wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") );
 369
 370 /*
 371         GdkDragAction action = GDK_ACTION_MOVE;
 372         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 373         context->action = action;
 374 */
 375         /* this should trigger an "drag_data_received" event */
 376         gtk_drag_get_data( widget,
 377                            context,
 378                            format,
 379                            time );
 380
 381 #if wxUSE_THREADS
 382         /* re-enable GUI threads */
 383 #endif
 384     }
 385
 386     /* after this, invalidate the drop_target's GdkDragContext */
 387     drop_target->SetDragContext( (GdkDragContext*) NULL );
 388
 389     /* after this, invalidate the drop_target's drag widget */
 390     drop_target->SetDragWidget( (GtkWidget*) NULL );
 391
 392     /* this has to be done because GDK has no "drag_enter" event */
 393     drop_target->m_firstMotion = true;
 394
 395     return ret;
 396 }
 397 }
 398
 399 // ----------------------------------------------------------------------------
 400 // "drag_data_received"
 401 // ----------------------------------------------------------------------------
 402
 403 extern "C" {
 404 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 405                                        GdkDragContext *context,
 406                                        gint x,
 407                                        gint y,
 408                                        GtkSelectionData *data,
 409                                        guint WXUNUSED(info),
 410                                        guint time,
 411                                        wxDropTarget *drop_target )
 412 {
 413     if (g_isIdle) wxapp_install_idle_handler();
 414
 415     /* Owen Taylor: "call gtk_drag_finish() with
 416        success == TRUE" */
 417
 418     if ((data->length <= 0) || (data->format != 8))
 419     {
 420         /* negative data length and non 8-bit data format
 421            qualifies for junk */
 422         gtk_drag_finish (context, FALSE, FALSE, time);
 423
 424         return;
 425     }
 426
 427     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 428
 429     /* inform the wxDropTarget about the current GtkSelectionData.
 430        this is only valid for the duration of this call */
 431     drop_target->SetDragData( data );
 432
 433     wxDragResult result = ConvertFromGTK(context->action);
 434
 435     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 436     {
 437         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned TRUE") );
 438
 439         /* tell GTK that data transfer was successful */
 440         gtk_drag_finish( context, TRUE, FALSE, time );
 441     }
 442     else
 443     {
 444         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 445
 446         /* tell GTK that data transfer was not successful */
 447         gtk_drag_finish( context, FALSE, FALSE, time );
 448     }
 449
 450     /* after this, invalidate the drop_target's drag data */
 451     drop_target->SetDragData( (GtkSelectionData*) NULL );
 452 }
 453 }
 454
 455 //----------------------------------------------------------------------------
 456 // wxDropTarget
 457 //----------------------------------------------------------------------------
 458
 459 wxDropTarget::wxDropTarget( wxDataObject *data )
 460             : wxDropTargetBase( data )
 461 {
 462     m_firstMotion = true;
 463     m_dragContext = (GdkDragContext*) NULL;
 464     m_dragWidget = (GtkWidget*) NULL;
 465     m_dragData = (GtkSelectionData*) NULL;
 466     m_dragTime = 0;
 467 }
 468
 469 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 470                                        wxCoord WXUNUSED(y),
 471                                        wxDragResult def )
 472 {
 473     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 474
 475     // disable the debug message from GetMatchingPair() - there are too many
 476     // of them otherwise
 477 #ifdef __WXDEBUG__
 478     wxLogNull noLog;
 479 #endif // Debug
 480
 481     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 482 }
 483
 484 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 485 {
 486     if (!m_dataObject)
 487         return false;
 488
 489     return (GetMatchingPair() != (GdkAtom) 0);
 490 }
 491
 492 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 493                                    wxDragResult def )
 494 {
 495     if (!m_dataObject)
 496         return wxDragNone;
 497
 498     if (GetMatchingPair() == (GdkAtom) 0)
 499         return wxDragNone;
 500
 501     return GetData() ? def : wxDragNone;
 502 }
 503
 504 GdkAtom wxDropTarget::GetMatchingPair()
 505 {
 506     if (!m_dataObject)
 507         return (GdkAtom) 0;
 508
 509     if (!m_dragContext)
 510         return (GdkAtom) 0;
 511
 512     GList *child = m_dragContext->targets;
 513     while (child)
 514     {
 515         GdkAtom formatAtom = GPOINTER_TO_INT(child->data);
 516         wxDataFormat format( formatAtom );
 517
 518 #ifdef __WXDEBUG__
 519         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 520                    format.GetId().c_str());
 521 #endif // Debug
 522
 523         if (m_dataObject->IsSupportedFormat( format ))
 524             return formatAtom;
 525
 526         child = child->next;
 527     }
 528
 529     return (GdkAtom) 0;
 530 }
 531
 532 bool wxDropTarget::GetData()
 533 {
 534     if (!m_dragData)
 535         return false;
 536
 537     if (!m_dataObject)
 538         return false;
 539
 540     wxDataFormat dragFormat( m_dragData->target );
 541
 542     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 543         return false;
 544
 545     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 546
 547     return true;
 548 }
 549
 550 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 551 {
 552     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 553
 554     gtk_drag_dest_unset( widget );
 555
 556     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 557                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 558
 559     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 560                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 561
 562     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 563                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 564
 565     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 566                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 567 }
 568
 569 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 570 {
 571     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 572
 573     /* gtk_drag_dest_set() determines what default behaviour we'd like
 574        GTK to supply. we don't want to specify out targets (=formats)
 575        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 576        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 577        "drag_motion" and "drag_drop" events. this makes it possible
 578        to allow dropping on only a small area. we should set
 579        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 580        highlighting if dragging over standard controls, but this
 581        seems to be broken without the other two. */
 582
 583     gtk_drag_dest_set( widget,
 584                        (GtkDestDefaults) 0,         /* no default behaviour */
 585                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 586                        0,                           /* number of targets = 0 */
 587                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 588
 589     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 590                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 591
 592     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 593                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 594
 595     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 596                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 597
 598     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 599                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 600 }
 601
 602 //----------------------------------------------------------------------------
 603 // "drag_data_get"
 604 //----------------------------------------------------------------------------
 605
 606 extern "C" {
 607 static void
 608 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 609                        GdkDragContext     *WXUNUSED(context),
 610                        GtkSelectionData   *selection_data,
 611                        guint               WXUNUSED(info),
 612                        guint               WXUNUSED(time),
 613                        wxDropSource       *drop_source )
 614 {
 615     if (g_isIdle) wxapp_install_idle_handler();
 616
 617     wxDataFormat format( selection_data->target );
 618
 619     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 620                format.GetId().c_str());
 621
 622     drop_source->m_retValue = wxDragCancel;
 623
 624     wxDataObject *data = drop_source->GetDataObject();
 625
 626     if (!data)
 627     {
 628         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 629         return;
 630     }
 631
 632     if (!data->IsSupportedFormat(format))
 633     {
 634         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 635         return;
 636     }
 637
 638     if (data->GetDataSize(format) == 0)
 639     {
 640         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 641         return;
 642     }
 643
 644     size_t size = data->GetDataSize(format);
 645
 646 //  printf( "data size: %d.\n", (int)data_size );
 647
 648     guchar *d = new guchar[size];
 649
 650     if (!data->GetDataHere( format, (void*)d ))
 651     {
 652         delete[] d;
 653         return;
 654     }
 655
 656 #if wxUSE_THREADS
 657     /* disable GUI threads */
 658 #endif
 659
 660     gtk_selection_data_set( selection_data,
 661                             selection_data->target,
 662                             8,   // 8-bit
 663                             d,
 664                             size );
 665
 666 #if wxUSE_THREADS
 667     /* enable GUI threads */
 668 #endif
 669
 670     delete[] d;
 671 }
 672 }
 673
 674 //----------------------------------------------------------------------------
 675 // "drag_data_delete"
 676 //----------------------------------------------------------------------------
 677
 678 extern "C" {
 679 static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
 680                                      GdkDragContext *WXUNUSED(context),
 681                                      wxDropSource *WXUNUSED(drop_source) )
 682 {
 683     if (g_isIdle)
 684         wxapp_install_idle_handler();
 685
 686     // printf( "Drag source: drag_data_delete\n" );
 687 }
 688 }
 689
 690 //----------------------------------------------------------------------------
 691 // "drag_begin"
 692 //----------------------------------------------------------------------------
 693
 694 extern "C" {
 695 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 696                                GdkDragContext     *WXUNUSED(context),
 697                                wxDropSource       *WXUNUSED(drop_source) )
 698 {
 699     if (g_isIdle)
 700         wxapp_install_idle_handler();
 701
 702     // printf( "Drag source: drag_begin.\n" );
 703 }
 704 }
 705
 706 //----------------------------------------------------------------------------
 707 // "drag_end"
 708 //----------------------------------------------------------------------------
 709
 710 extern "C" {
 711 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 712                              GdkDragContext     *WXUNUSED(context),
 713                              wxDropSource       *drop_source )
 714 {
 715     if (g_isIdle) wxapp_install_idle_handler();
 716
 717     // printf( "Drag source: drag_end.\n" );
 718
 719     drop_source->m_waiting = false;
 720 }
 721 }
 722
 723 //-----------------------------------------------------------------------------
 724 // "configure_event" from m_iconWindow
 725 //-----------------------------------------------------------------------------
 726
 727 extern "C" {
 728 static gint
 729 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 730 {
 731     if (g_isIdle)
 732         wxapp_install_idle_handler();
 733
 734     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 735
 736     return 0;
 737 }
 738 }
 739
 740 //---------------------------------------------------------------------------
 741 // wxDropSource
 742 //---------------------------------------------------------------------------
 743
 744 wxDropSource::wxDropSource(wxWindow *win,
 745                            const wxIcon &iconCopy,
 746                            const wxIcon &iconMove,
 747                            const wxIcon &iconNone)
 748 {
 749     m_waiting = true;
 750
 751     m_iconWindow = (GtkWidget*) NULL;
 752
 753     m_window = win;
 754     m_widget = win->m_widget;
 755     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 756
 757     m_retValue = wxDragCancel;
 758
 759     SetIcons(iconCopy, iconMove, iconNone);
 760 }
 761
 762 wxDropSource::wxDropSource(wxDataObject& data,
 763                            wxWindow *win,
 764                            const wxIcon &iconCopy,
 765                            const wxIcon &iconMove,
 766                            const wxIcon &iconNone)
 767 {
 768     m_waiting = true;
 769
 770     SetData( data );
 771
 772     m_iconWindow = (GtkWidget*) NULL;
 773
 774     m_window = win;
 775     m_widget = win->m_widget;
 776     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 777
 778     m_retValue = wxDragCancel;
 779
 780     SetIcons(iconCopy, iconMove, iconNone);
 781 }
 782
 783 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 784                             const wxIcon &iconMove,
 785                             const wxIcon &iconNone)
 786 {
 787     m_iconCopy = iconCopy;
 788     m_iconMove = iconMove;
 789     m_iconNone = iconNone;
 790
 791     if ( !m_iconCopy.Ok() )
 792         m_iconCopy = wxIcon(page_xpm);
 793     if ( !m_iconMove.Ok() )
 794         m_iconMove = m_iconCopy;
 795     if ( !m_iconNone.Ok() )
 796         m_iconNone = m_iconCopy;
 797 }
 798
 799 wxDropSource::~wxDropSource()
 800 {
 801 }
 802
 803 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 804 {
 805     // get the right icon to display
 806     wxIcon *icon = NULL;
 807     if ( action & GDK_ACTION_MOVE )
 808         icon = &m_iconMove;
 809     else if ( action & GDK_ACTION_COPY )
 810         icon = &m_iconCopy;
 811     else
 812         icon = &m_iconNone;
 813
 814     GdkBitmap *mask;
 815     if ( icon->GetMask() )
 816         mask = icon->GetMask()->GetBitmap();
 817     else
 818         mask = (GdkBitmap *)NULL;
 819
 820     GdkPixmap *pixmap = icon->GetPixmap();
 821
 822     gint width,height;
 823     gdk_window_get_size (pixmap, &width, &height);
 824
 825     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 826     gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
 827     gtk_widget_push_colormap (colormap);
 828
 829     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 830     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 831     gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
 832
 833     gtk_widget_pop_visual ();
 834     gtk_widget_pop_colormap ();
 835
 836     gtk_widget_set_usize (m_iconWindow, width, height);
 837     gtk_widget_realize (m_iconWindow);
 838
 839     gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
 840         GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
 841
 842     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 843
 844     if (mask)
 845         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 846
 847     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 848 }
 849
 850 wxDragResult wxDropSource::DoDragDrop(int flags)
 851 {
 852     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 853                  wxT("Drop source: no data") );
 854
 855     // still in drag
 856     if (g_blockEventsOnDrag)
 857         return wxDragNone;
 858
 859     // don't start dragging if no button is down
 860     if (g_lastButtonNumber == 0)
 861         return wxDragNone;
 862
 863     // we can only start a drag after a mouse event
 864     if (g_lastMouseEvent == NULL)
 865         return wxDragNone;
 866
 867     // disabled for now
 868     g_blockEventsOnDrag = true;
 869
 870     RegisterWindow();
 871
 872     m_waiting = true;
 873
 874     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 875
 876     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 877     m_data->GetAllFormats( array );
 878     size_t count = m_data->GetFormatCount();
 879     for (size_t i = 0; i < count; i++)
 880     {
 881         GdkAtom atom = array[i];
 882         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 883         gtk_target_list_add( target_list, atom, 0, 0 );
 884     }
 885     delete[] array;
 886
 887         int action = GDK_ACTION_COPY;
 888         if ( flags & wxDrag_AllowMove )
 889             action |= GDK_ACTION_MOVE;
 890
 891         // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 892         //     to use a global to pass the flags to the drop target but I'd
 893         //     surely prefer a better way to do it
 894         gs_flagsForDrag = flags;
 895
 896         GdkDragContext *context = gtk_drag_begin( m_widget,
 897                 target_list,
 898                 (GdkDragAction)action,
 899                 g_lastButtonNumber,  // number of mouse button which started drag
 900                 (GdkEvent*) g_lastMouseEvent );
 901
 902         m_dragContext = context;
 903
 904         PrepareIcon( action, context );
 905
 906         while (m_waiting)
 907             gtk_main_iteration();
 908
 909         m_retValue = ConvertFromGTK(context->action);
 910         if ( m_retValue == wxDragNone )
 911             m_retValue = wxDragCancel;
 912
 913     g_blockEventsOnDrag = false;
 914
 915     UnregisterWindow();
 916
 917     return m_retValue;
 918 }
 919
 920 void wxDropSource::RegisterWindow()
 921 {
 922     if (!m_widget) return;
 923
 924     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 925                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 926     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 927                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 928     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 929                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 930     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 931                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 932
 933 }
 934
 935 void wxDropSource::UnregisterWindow()
 936 {
 937     if (!m_widget) return;
 938
 939     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 940                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 941     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 942                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 943     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 944                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 945     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 946                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 947 }
 948
 949 #endif
 950       // wxUSE_DRAG_AND_DROP