src/gtk/dnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        dnd.cpp
   3 // Purpose:     wxDropTarget class
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  11     #pragma implementation "dnd.h"
  12 #endif
  13
  14 // For compilers that support precompilation, includes "wx.h".
  15 #include "wx/wxprec.h"
  16
  17 #include "wx/dnd.h"
  18 #include "wx/log.h"
  19
  20
  21 #if wxUSE_DRAG_AND_DROP
  22
  23 #include "wx/window.h"
  24 #include "wx/app.h"
  25 #include "wx/gdicmn.h"
  26 #include "wx/intl.h"
  27 #include "wx/utils.h"
  28
  29 #include "wx/gtk/private.h"
  30
  31 #include <gdk/gdkprivate.h>
  32
  33 #include <gtk/gtkdnd.h>
  34 #include <gtk/gtkselection.h>
  35
  36 //-----------------------------------------------------------------------------
  37 // idle system
  38 //-----------------------------------------------------------------------------
  39
  40 extern void wxapp_install_idle_handler();
  41 extern bool g_isIdle;
  42
  43 //-----------------------------------------------------------------------------
  44 // thread system
  45 //-----------------------------------------------------------------------------
  46
  47 #if wxUSE_THREADS
  48 #endif
  49
  50 //----------------------------------------------------------------------------
  51 // global data
  52 //----------------------------------------------------------------------------
  53
  54 extern bool g_blockEventsOnDrag;
  55
  56 // the flags used for the last DoDragDrop()
  57 static long gs_flagsForDrag = 0;
  58
  59 // the trace mask we use with wxLogTrace() - call
  60 // wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
  61 // (there are quite a few of them, so don't enable this by default)
  62 static const wxChar *TRACE_DND = _T("dnd");
  63
  64 //----------------------------------------------------------------------------
  65 // standard icons
  66 //----------------------------------------------------------------------------
  67
  68 /* XPM */
  69 static const char * page_xpm[] = {
  70 /* width height ncolors chars_per_pixel */
  71 "32 32 5 1",
  72 /* colors */
  73 "         s None        c None",
  74 ".        c black",
  75 "X        c wheat",
  76 "o        c tan",
  77 "O        c #6699FF",
  78 /* pixels */
  79 "    ...................         ",
  80 "    .XXXXXXXXXXXXXXXXX..        ",
  81 "    .XXXXXXXXXXXXXXXXX.o.       ",
  82 "    .XXXXXXXXXXXXXXXXX.oo.      ",
  83 "    .XXXXXXXXXXXXXXXXX.ooo.     ",
  84 "    .XXXXXXXXXXXXXXXXX.oooo.    ",
  85 "    .XXXXXXXXXXXXXXXXX.......   ",
  86 "    .XXXXXOOOOOOOOOOXXXooooo.   ",
  87 "    .XXXXXXXXXXXXXXXXXXooooo.   ",
  88 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
  89 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  90 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
  91 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  92 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
  93 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  94 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
  95 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  96 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
  97 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  98 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
  99 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 100 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 101 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 102 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 103 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 104 "    .XXXXXOOOOOOOXXXXXXXXXXX.   ",
 105 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 106 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 107 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 108 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 109 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 110 "    .........................   "};
 111
 112
 113 // ============================================================================
 114 // private functions
 115 // ============================================================================
 116
 117 // ----------------------------------------------------------------------------
 118 // convert between GTK+ and wxWidgets DND constants
 119 // ----------------------------------------------------------------------------
 120
 121 static wxDragResult ConvertFromGTK(long action)
 122 {
 123     switch ( action )
 124     {
 125         case GDK_ACTION_COPY:
 126             return wxDragCopy;
 127
 128         case GDK_ACTION_LINK:
 129             return wxDragLink;
 130
 131         case GDK_ACTION_MOVE:
 132             return wxDragMove;
 133     }
 134
 135     return wxDragNone;
 136 }
 137
 138 // ----------------------------------------------------------------------------
 139 // "drag_leave"
 140 // ----------------------------------------------------------------------------
 141
 142 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 143                                GdkDragContext *context,
 144                                guint WXUNUSED(time),
 145                                wxDropTarget *drop_target )
 146 {
 147     if (g_isIdle) wxapp_install_idle_handler();
 148
 149     /* inform the wxDropTarget about the current GdkDragContext.
 150        this is only valid for the duration of this call */
 151     drop_target->SetDragContext( context );
 152
 153     /* we don't need return values. this event is just for
 154        information */
 155     drop_target->OnLeave();
 156
 157     /* this has to be done because GDK has no "drag_enter" event */
 158     drop_target->m_firstMotion = TRUE;
 159
 160     /* after this, invalidate the drop_target's GdkDragContext */
 161     drop_target->SetDragContext( (GdkDragContext*) NULL );
 162 }
 163
 164 // ----------------------------------------------------------------------------
 165 // "drag_motion"
 166 // ----------------------------------------------------------------------------
 167
 168 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 169                                     GdkDragContext *context,
 170                                     gint x,
 171                                     gint y,
 172                                     guint time,
 173                                     wxDropTarget *drop_target )
 174 {
 175     if (g_isIdle) wxapp_install_idle_handler();
 176
 177     /* Owen Taylor: "if the coordinates not in a drop zone,
 178        return FALSE, otherwise call gtk_drag_status() and
 179        return TRUE" */
 180
 181     /* inform the wxDropTarget about the current GdkDragContext.
 182        this is only valid for the duration of this call */
 183     drop_target->SetDragContext( context );
 184
 185     // GTK+ always supposes that we want to copy the data by default while we
 186     // might want to move it, so examine not only suggested_action - which is
 187     // only good if we don't have our own preferences - but also the actions
 188     // field
 189     wxDragResult result;
 190     if (drop_target->GetDefaultAction() == wxDragNone)
 191     {
 192         // use default action set by wxDropSource::DoDragDrop()
 193     if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 194             (context->actions & GDK_ACTION_MOVE ) )
 195     {
 196         // move is requested by the program and allowed by GTK+ - do it, even
 197         // though suggested_action may be currently wxDragCopy
 198         result = wxDragMove;
 199     }
 200     else // use whatever GTK+ says we should
 201     {
 202         result = ConvertFromGTK(context->suggested_action);
 203
 204         if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 205         {
 206             // we're requested to move but we can't
 207             result = wxDragCopy;
 208         }
 209     }
 210     }
 211     else if (drop_target->GetDefaultAction() == wxDragMove &&
 212                 (context->actions & GDK_ACTION_MOVE))
 213     {
 214        result = wxDragMove;
 215     }
 216     else
 217     {
 218         if (context->actions & GDK_ACTION_COPY)
 219             result = wxDragCopy;
 220         else if (context->actions & GDK_ACTION_MOVE)
 221             result = wxDragMove;
 222         else
 223             result = wxDragNone;
 224     }
 225
 226     if (drop_target->m_firstMotion)
 227     {
 228         /* the first "drag_motion" event substitutes a "drag_enter" event */
 229         result = drop_target->OnEnter( x, y, result );
 230     }
 231     else
 232     {
 233         /* give program a chance to react (i.e. to say no by returning FALSE) */
 234         result = drop_target->OnDragOver( x, y, result );
 235     }
 236
 237     bool ret = wxIsDragResultOk( result );
 238     if (ret)
 239     {
 240         GdkDragAction action;
 241         if (result == wxDragCopy)
 242             action = GDK_ACTION_COPY;
 243         else if (result == wxDragLink)
 244             action = GDK_ACTION_LINK;
 245         else
 246             action = GDK_ACTION_MOVE;
 247
 248         gdk_drag_status( context, action, time );
 249     }
 250
 251     /* after this, invalidate the drop_target's GdkDragContext */
 252     drop_target->SetDragContext( (GdkDragContext*) NULL );
 253
 254     /* this has to be done because GDK has no "drag_enter" event */
 255     drop_target->m_firstMotion = FALSE;
 256
 257     return ret;
 258 }
 259
 260 // ----------------------------------------------------------------------------
 261 // "drag_drop"
 262 // ----------------------------------------------------------------------------
 263
 264 static gboolean target_drag_drop( GtkWidget *widget,
 265                                   GdkDragContext *context,
 266                                   gint x,
 267                                   gint y,
 268                                   guint time,
 269                                   wxDropTarget *drop_target )
 270 {
 271     if (g_isIdle) wxapp_install_idle_handler();
 272
 273     /* Owen Taylor: "if the drop is not in a drop zone,
 274        return FALSE, otherwise, if you aren't accepting
 275        the drop, call gtk_drag_finish() with success == FALSE
 276        otherwise call gtk_drag_data_get()" */
 277
 278 //    printf( "drop.\n" );
 279
 280     /* this seems to make a difference between not accepting
 281        due to wrong target area and due to wrong format. let
 282        us hope that this is not required.. */
 283
 284     /* inform the wxDropTarget about the current GdkDragContext.
 285        this is only valid for the duration of this call */
 286     drop_target->SetDragContext( context );
 287
 288     /* inform the wxDropTarget about the current drag widget.
 289        this is only valid for the duration of this call */
 290     drop_target->SetDragWidget( widget );
 291
 292     /* inform the wxDropTarget about the current drag time.
 293        this is only valid for the duration of this call */
 294     drop_target->SetDragTime( time );
 295
 296 /*
 297     wxDragResult result = wxDragMove;
 298     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 299 */
 300
 301     /* reset the block here as someone might very well
 302        show a dialog as a reaction to a drop and this
 303        wouldn't work without events */
 304     g_blockEventsOnDrag = FALSE;
 305
 306     bool ret = drop_target->OnDrop( x, y );
 307
 308     if (!ret)
 309     {
 310         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 311
 312         /* cancel the whole thing */
 313         gtk_drag_finish( context,
 314                           FALSE,        /* no success */
 315                           FALSE,        /* don't delete data on dropping side */
 316                           time );
 317     }
 318     else
 319     {
 320         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned TRUE") );
 321
 322 #if wxUSE_THREADS
 323         /* disable GUI threads */
 324 #endif
 325
 326         GdkAtom format = drop_target->GetMatchingPair();
 327
 328         // this does happen somehow, see bug 555111
 329         wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") )
 330
 331 /*
 332         GdkDragAction action = GDK_ACTION_MOVE;
 333         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 334         context->action = action;
 335 */
 336         /* this should trigger an "drag_data_received" event */
 337         gtk_drag_get_data( widget,
 338                            context,
 339                            format,
 340                            time );
 341
 342 #if wxUSE_THREADS
 343         /* re-enable GUI threads */
 344 #endif
 345     }
 346
 347     /* after this, invalidate the drop_target's GdkDragContext */
 348     drop_target->SetDragContext( (GdkDragContext*) NULL );
 349
 350     /* after this, invalidate the drop_target's drag widget */
 351     drop_target->SetDragWidget( (GtkWidget*) NULL );
 352
 353     /* this has to be done because GDK has no "drag_enter" event */
 354     drop_target->m_firstMotion = TRUE;
 355
 356     return ret;
 357 }
 358
 359 // ----------------------------------------------------------------------------
 360 // "drag_data_received"
 361 // ----------------------------------------------------------------------------
 362
 363 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 364                                        GdkDragContext *context,
 365                                        gint x,
 366                                        gint y,
 367                                        GtkSelectionData *data,
 368                                        guint WXUNUSED(info),
 369                                        guint time,
 370                                        wxDropTarget *drop_target )
 371 {
 372     if (g_isIdle) wxapp_install_idle_handler();
 373
 374     /* Owen Taylor: "call gtk_drag_finish() with
 375        success == TRUE" */
 376
 377     if ((data->length <= 0) || (data->format != 8))
 378     {
 379         /* negative data length and non 8-bit data format
 380            qualifies for junk */
 381         gtk_drag_finish (context, FALSE, FALSE, time);
 382
 383         return;
 384     }
 385
 386     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 387
 388     /* inform the wxDropTarget about the current GtkSelectionData.
 389        this is only valid for the duration of this call */
 390     drop_target->SetDragData( data );
 391
 392     wxDragResult result = ConvertFromGTK(context->action);
 393
 394     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 395     {
 396         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned TRUE") );
 397
 398         /* tell GTK that data transfer was successfull */
 399         gtk_drag_finish( context, TRUE, FALSE, time );
 400     }
 401     else
 402     {
 403         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 404
 405         /* tell GTK that data transfer was not successfull */
 406         gtk_drag_finish( context, FALSE, FALSE, time );
 407     }
 408
 409     /* after this, invalidate the drop_target's drag data */
 410     drop_target->SetDragData( (GtkSelectionData*) NULL );
 411 }
 412
 413 //----------------------------------------------------------------------------
 414 // wxDropTarget
 415 //----------------------------------------------------------------------------
 416
 417 wxDropTarget::wxDropTarget( wxDataObject *data )
 418             : wxDropTargetBase( data )
 419 {
 420     m_firstMotion = TRUE;
 421     m_dragContext = (GdkDragContext*) NULL;
 422     m_dragWidget = (GtkWidget*) NULL;
 423     m_dragData = (GtkSelectionData*) NULL;
 424     m_dragTime = 0;
 425 }
 426
 427 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 428                                        wxCoord WXUNUSED(y),
 429                                        wxDragResult def )
 430 {
 431     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 432
 433     // disable the debug message from GetMatchingPair() - there are too many
 434     // of them otherwise
 435 #ifdef __WXDEBUG__
 436     wxLogNull noLog;
 437 #endif // Debug
 438
 439     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 440 }
 441
 442 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 443 {
 444     if (!m_dataObject)
 445         return FALSE;
 446
 447     return (GetMatchingPair() != (GdkAtom) 0);
 448 }
 449
 450 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 451                                    wxDragResult def )
 452 {
 453     if (!m_dataObject)
 454         return wxDragNone;
 455
 456     if (GetMatchingPair() == (GdkAtom) 0)
 457         return wxDragNone;
 458
 459     return GetData() ? def : wxDragNone;
 460 }
 461
 462 GdkAtom wxDropTarget::GetMatchingPair()
 463 {
 464     if (!m_dataObject)
 465         return (GdkAtom) 0;
 466
 467     if (!m_dragContext)
 468         return (GdkAtom) 0;
 469
 470     GList *child = m_dragContext->targets;
 471     while (child)
 472     {
 473         GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
 474         wxDataFormat format( formatAtom );
 475
 476 #ifdef __WXDEBUG__
 477         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 478                    format.GetId().c_str());
 479 #endif // Debug
 480
 481         if (m_dataObject->IsSupportedFormat( format ))
 482             return formatAtom;
 483
 484         child = child->next;
 485     }
 486
 487     return (GdkAtom) 0;
 488 }
 489
 490 bool wxDropTarget::GetData()
 491 {
 492     if (!m_dragData)
 493         return FALSE;
 494
 495     if (!m_dataObject)
 496         return FALSE;
 497
 498     wxDataFormat dragFormat( m_dragData->target );
 499
 500     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 501         return FALSE;
 502
 503     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 504
 505     return TRUE;
 506 }
 507
 508 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 509 {
 510     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 511
 512     gtk_drag_dest_unset( widget );
 513
 514     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 515                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 516
 517     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 518                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 519
 520     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 521                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 522
 523     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 524                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 525 }
 526
 527 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 528 {
 529     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 530
 531     /* gtk_drag_dest_set() determines what default behaviour we'd like
 532        GTK to supply. we don't want to specify out targets (=formats)
 533        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 534        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 535        "drag_motion" and "drag_drop" events. this makes it possible
 536        to allow dropping on only a small area. we should set
 537        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 538        highlighting if dragging over standard controls, but this
 539        seems to be broken without the other two. */
 540
 541     gtk_drag_dest_set( widget,
 542                        (GtkDestDefaults) 0,         /* no default behaviour */
 543                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 544                        0,                           /* number of targets = 0 */
 545                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 546
 547     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 548                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 549
 550     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 551                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 552
 553     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 554                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 555
 556     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 557                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 558 }
 559
 560 //----------------------------------------------------------------------------
 561 // "drag_data_get"
 562 //----------------------------------------------------------------------------
 563
 564 static void
 565 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 566                        GdkDragContext     *WXUNUSED(context),
 567                        GtkSelectionData   *selection_data,
 568                        guint               WXUNUSED(info),
 569                        guint               WXUNUSED(time),
 570                        wxDropSource       *drop_source )
 571 {
 572     if (g_isIdle) wxapp_install_idle_handler();
 573
 574     wxDataFormat format( selection_data->target );
 575
 576     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 577                format.GetId().c_str());
 578
 579     drop_source->m_retValue = wxDragCancel;
 580
 581     wxDataObject *data = drop_source->GetDataObject();
 582
 583     if (!data)
 584     {
 585         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 586         return;
 587     }
 588
 589     if (!data->IsSupportedFormat(format))
 590     {
 591         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 592         return;
 593     }
 594
 595     if (data->GetDataSize(format) == 0)
 596     {
 597         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 598         return;
 599     }
 600
 601     size_t size = data->GetDataSize(format);
 602
 603 //  printf( "data size: %d.\n", (int)data_size );
 604
 605     guchar *d = new guchar[size];
 606
 607     if (!data->GetDataHere( format, (void*)d ))
 608     {
 609         delete[] d;
 610         return;
 611     }
 612
 613 #if wxUSE_THREADS
 614     /* disable GUI threads */
 615 #endif
 616
 617                 gtk_selection_data_set( selection_data,
 618                                         selection_data->target,
 619                                         8,   // 8-bit
 620                                         d,
 621                                         size );
 622
 623 #if wxUSE_THREADS
 624     /* enable GUI threads */
 625 #endif
 626
 627     delete[] d;
 628 }
 629
 630 //----------------------------------------------------------------------------
 631 // "drag_data_delete"
 632 //----------------------------------------------------------------------------
 633
 634 static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
 635                                      GdkDragContext *context,
 636                                      wxDropSource *WXUNUSED(drop_source) )
 637 {
 638     if (g_isIdle)
 639         wxapp_install_idle_handler();
 640
 641     // printf( "Drag source: drag_data_delete\n" );
 642 }
 643
 644 //----------------------------------------------------------------------------
 645 // "drag_begin"
 646 //----------------------------------------------------------------------------
 647
 648 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 649                                GdkDragContext     *WXUNUSED(context),
 650                                wxDropSource       *WXUNUSED(drop_source) )
 651 {
 652     if (g_isIdle)
 653         wxapp_install_idle_handler();
 654
 655     // printf( "Drag source: drag_begin.\n" );
 656 }
 657
 658 //----------------------------------------------------------------------------
 659 // "drag_end"
 660 //----------------------------------------------------------------------------
 661
 662 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 663                              GdkDragContext     *WXUNUSED(context),
 664                              wxDropSource       *drop_source )
 665 {
 666     if (g_isIdle) wxapp_install_idle_handler();
 667
 668     // printf( "Drag source: drag_end.\n" );
 669
 670     drop_source->m_waiting = FALSE;
 671 }
 672
 673 //-----------------------------------------------------------------------------
 674 // "configure_event" from m_iconWindow
 675 //-----------------------------------------------------------------------------
 676
 677 static gint
 678 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 679 {
 680     if (g_isIdle)
 681         wxapp_install_idle_handler();
 682
 683     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 684
 685     return 0;
 686 }
 687
 688 //---------------------------------------------------------------------------
 689 // wxDropSource
 690 //---------------------------------------------------------------------------
 691
 692 wxDropSource::wxDropSource(wxWindow *win,
 693                            const wxIcon &iconCopy,
 694                            const wxIcon &iconMove,
 695                            const wxIcon &iconNone)
 696 {
 697     m_waiting = TRUE;
 698
 699     m_iconWindow = (GtkWidget*) NULL;
 700
 701     m_window = win;
 702     m_widget = win->m_widget;
 703     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 704
 705     m_retValue = wxDragCancel;
 706
 707     SetIcons(iconCopy, iconMove, iconNone);
 708 }
 709
 710 wxDropSource::wxDropSource(wxDataObject& data,
 711                            wxWindow *win,
 712                            const wxIcon &iconCopy,
 713                            const wxIcon &iconMove,
 714                            const wxIcon &iconNone)
 715 {
 716     m_waiting = TRUE;
 717
 718     SetData( data );
 719
 720     m_iconWindow = (GtkWidget*) NULL;
 721
 722     m_window = win;
 723     m_widget = win->m_widget;
 724     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 725
 726     m_retValue = wxDragCancel;
 727
 728     SetIcons(iconCopy, iconMove, iconNone);
 729 }
 730
 731 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 732                             const wxIcon &iconMove,
 733                             const wxIcon &iconNone)
 734 {
 735     m_iconCopy = iconCopy;
 736     m_iconMove = iconMove;
 737     m_iconNone = iconNone;
 738
 739     if ( !m_iconCopy.Ok() )
 740         m_iconCopy = wxIcon(page_xpm);
 741     if ( !m_iconMove.Ok() )
 742         m_iconMove = m_iconCopy;
 743     if ( !m_iconNone.Ok() )
 744         m_iconNone = m_iconCopy;
 745 }
 746
 747 wxDropSource::~wxDropSource()
 748 {
 749 }
 750
 751 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 752 {
 753     // get the right icon to display
 754     wxIcon *icon = NULL;
 755     if ( action & GDK_ACTION_MOVE )
 756         icon = &m_iconMove;
 757     else if ( action & GDK_ACTION_COPY )
 758         icon = &m_iconCopy;
 759     else
 760         icon = &m_iconNone;
 761
 762     GdkBitmap *mask;
 763     if ( icon->GetMask() )
 764         mask = icon->GetMask()->GetBitmap();
 765     else
 766         mask = (GdkBitmap *)NULL;
 767
 768     GdkPixmap *pixmap = icon->GetPixmap();
 769
 770     gint width,height;
 771     gdk_window_get_size (pixmap, &width, &height);
 772
 773     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 774 #ifndef __WXGTK20__
 775     gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
 776 #endif
 777     gtk_widget_push_colormap (colormap);
 778
 779     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 780     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 781     gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
 782
 783 #ifndef __WXGTK20__
 784     gtk_widget_pop_visual ();
 785 #endif
 786     gtk_widget_pop_colormap ();
 787
 788     gtk_widget_set_usize (m_iconWindow, width, height);
 789     gtk_widget_realize (m_iconWindow);
 790
 791     gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
 792         GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
 793
 794     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 795
 796     if (mask)
 797         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 798
 799     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 800 }
 801
 802 wxDragResult wxDropSource::DoDragDrop(int flags)
 803 {
 804     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 805                  wxT("Drop source: no data") );
 806
 807     // still in drag
 808     if (g_blockEventsOnDrag)
 809         return wxDragNone;
 810
 811     // disabled for now
 812     g_blockEventsOnDrag = TRUE;
 813
 814     RegisterWindow();
 815
 816     m_waiting = TRUE;
 817
 818     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 819
 820     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 821     m_data->GetAllFormats( array );
 822     size_t count = m_data->GetFormatCount();
 823     for (size_t i = 0; i < count; i++)
 824     {
 825         GdkAtom atom = array[i];
 826         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 827         gtk_target_list_add( target_list, atom, 0, 0 );
 828     }
 829     delete[] array;
 830
 831     GdkEventMotion event;
 832     event.window = m_widget->window;
 833     int x = 0;
 834     int y = 0;
 835     GdkModifierType state;
 836     gdk_window_get_pointer( event.window, &x, &y, &state );
 837     event.x = x;
 838     event.y = y;
 839     event.state = state;
 840     event.time = (guint32)GDK_CURRENT_TIME;
 841
 842     /* GTK wants to know which button was pressed which caused the dragging */
 843     int button_number = 0;
 844     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 845     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 846     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 847
 848 #if wxUSE_THREADS
 849     /* disable GUI threads */
 850 #endif
 851
 852     /* don't start dragging if no button is down */
 853     if (button_number)
 854     {
 855         int action = GDK_ACTION_COPY;
 856         if ( flags & wxDrag_AllowMove )
 857             action |= GDK_ACTION_MOVE;
 858
 859         // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 860         //     to use a global to pass the flags to the drop target but I'd
 861         //     surely prefer a better way to do it
 862         gs_flagsForDrag = flags;
 863
 864         GdkDragContext *context = gtk_drag_begin( m_widget,
 865                 target_list,
 866                 (GdkDragAction)action,
 867                 button_number,  /* number of mouse button which started drag */
 868                 (GdkEvent*) &event );
 869
 870         m_dragContext = context;
 871
 872         PrepareIcon( action, context );
 873
 874         while (m_waiting)
 875             gtk_main_iteration();
 876
 877         m_retValue = ConvertFromGTK(context->action);
 878         if ( m_retValue == wxDragNone )
 879             m_retValue = wxDragCancel;
 880     }
 881
 882 #if wxUSE_THREADS
 883     /* re-enable GUI threads */
 884 #endif
 885
 886     g_blockEventsOnDrag = FALSE;
 887
 888     UnregisterWindow();
 889
 890     return m_retValue;
 891 }
 892
 893 void wxDropSource::RegisterWindow()
 894 {
 895     if (!m_widget) return;
 896
 897     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 898                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 899     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 900                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 901     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 902                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 903     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 904                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 905
 906 }
 907
 908 void wxDropSource::UnregisterWindow()
 909 {
 910     if (!m_widget) return;
 911
 912     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 913                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 914     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 915                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 916     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 917                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 918     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 919                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 920 }
 921
 922 #endif
 923       // wxUSE_DRAG_AND_DROP