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 #endif
  23
  24 #include "wx/window.h"
  25 #include "wx/gdicmn.h"
  26
  27 #include "wx/gtk1/private.h"
  28
  29 #include <gdk/gdkprivate.h>
  30
  31 #include <gtk/gtkdnd.h>
  32 #include <gtk/gtkselection.h>
  33
  34 //-----------------------------------------------------------------------------
  35 // idle system
  36 //-----------------------------------------------------------------------------
  37
  38 extern void wxapp_install_idle_handler();
  39 extern bool g_isIdle;
  40
  41 //-----------------------------------------------------------------------------
  42 // thread system
  43 //-----------------------------------------------------------------------------
  44
  45 #if wxUSE_THREADS
  46 #endif
  47
  48 //----------------------------------------------------------------------------
  49 // global data
  50 //----------------------------------------------------------------------------
  51
  52 extern bool g_blockEventsOnDrag;
  53
  54 // the flags used for the last DoDragDrop()
  55 static long gs_flagsForDrag = 0;
  56
  57 // the trace mask we use with wxLogTrace() - call
  58 // wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
  59 // (there are quite a few of them, so don't enable this by default)
  60 static const wxChar *TRACE_DND = _T("dnd");
  61
  62 //----------------------------------------------------------------------------
  63 // standard icons
  64 //----------------------------------------------------------------------------
  65
  66 /* Copyright (c) Julian Smart */
  67 static const char * page_xpm[] = {
  68 /* columns rows colors chars-per-pixel */
  69 "32 32 37 1",
  70 "5 c #7198D9",
  71 ", c #769CDA",
  72 "2 c #DCE6F6",
  73 "i c #FFFFFF",
  74 "e c #779DDB",
  75 ": c #9AB6E4",
  76 "9 c #EAF0FA",
  77 "- c #B1C7EB",
  78 "$ c #6992D7",
  79 "y c #F7F9FD",
  80 "= c #BED0EE",
  81 "q c #F0F5FC",
  82 "; c #A8C0E8",
  83 "@ c #366BC2",
  84 "  c None",
  85 "u c #FDFEFF",
  86 "8 c #5987D3",
  87 "* c #C4D5F0",
  88 "7 c #7CA0DC",
  89 "O c #487BCE",
  90 "< c #6B94D7",
  91 "& c #CCDAF2",
  92 "> c #89A9DF",
  93 "3 c #5584D1",
  94 "w c #82A5DE",
  95 "1 c #3F74CB",
  96 "+ c #3A70CA",
  97 ". c #3569BF",
  98 "% c #D2DFF4",
  99 "# c #3366BB",
 100 "r c #F5F8FD",
 101 "0 c #FAFCFE",
 102 "4 c #DFE8F7",
 103 "X c #5E8AD4",
 104 "o c #5282D0",
 105 "t c #B8CCEC",
 106 "6 c #E5EDF9",
 107 /* pixels */
 108 "                                ",
 109 "                                ",
 110 "                                ",
 111 "                                ",
 112 "                                ",
 113 "       .XXXooOO++@#             ",
 114 "       $%&*=-;::>,<1            ",
 115 "       $2%&*=-;::><:3           ",
 116 "       $42%&*=-;::<&:3          ",
 117 "       56477<<<<8<<9&:X         ",
 118 "       59642%&*=-;<09&:5        ",
 119 "       5q9642%&*=-<<<<<#        ",
 120 "       5qqw777<<<<<88:>+        ",
 121 "       erqq9642%&*=t;::+        ",
 122 "       eyrqq9642%&*=t;:O        ",
 123 "       eyywwww777<<<<t;O        ",
 124 "       e0yyrqq9642%&*=to        ",
 125 "       e00yyrqq9642%&*=o        ",
 126 "       eu0wwwwwww777<&*X        ",
 127 "       euu00yyrqq9642%&X        ",
 128 "       eiuu00yyrqq9642%X        ",
 129 "       eiiwwwwwwwwww742$        ",
 130 "       eiiiuu00yyrqq964$        ",
 131 "       eiiiiuu00yyrqq96$        ",
 132 "       eiiiiiuu00yyrqq95        ",
 133 "       eiiiiiiuu00yyrqq5        ",
 134 "       eeeeeeeeeeeeee55e        ",
 135 "                                ",
 136 "                                ",
 137 "                                ",
 138 "                                ",
 139 "                                "
 140 };
 141
 142
 143 // ============================================================================
 144 // private functions
 145 // ============================================================================
 146
 147 // ----------------------------------------------------------------------------
 148 // convert between GTK+ and wxWidgets DND constants
 149 // ----------------------------------------------------------------------------
 150
 151 static wxDragResult ConvertFromGTK(long action)
 152 {
 153     switch ( action )
 154     {
 155         case GDK_ACTION_COPY:
 156             return wxDragCopy;
 157
 158         case GDK_ACTION_LINK:
 159             return wxDragLink;
 160
 161         case GDK_ACTION_MOVE:
 162             return wxDragMove;
 163     }
 164
 165     return wxDragNone;
 166 }
 167
 168 // ----------------------------------------------------------------------------
 169 // "drag_leave"
 170 // ----------------------------------------------------------------------------
 171
 172 extern "C" {
 173 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 174                                GdkDragContext *context,
 175                                guint WXUNUSED(time),
 176                                wxDropTarget *drop_target )
 177 {
 178     if (g_isIdle) wxapp_install_idle_handler();
 179
 180     /* inform the wxDropTarget about the current GdkDragContext.
 181        this is only valid for the duration of this call */
 182     drop_target->SetDragContext( context );
 183
 184     /* we don't need return values. this event is just for
 185        information */
 186     drop_target->OnLeave();
 187
 188     /* this has to be done because GDK has no "drag_enter" event */
 189     drop_target->m_firstMotion = true;
 190
 191     /* after this, invalidate the drop_target's GdkDragContext */
 192     drop_target->SetDragContext( (GdkDragContext*) NULL );
 193 }
 194 }
 195
 196 // ----------------------------------------------------------------------------
 197 // "drag_motion"
 198 // ----------------------------------------------------------------------------
 199
 200 extern "C" {
 201 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 202                                     GdkDragContext *context,
 203                                     gint x,
 204                                     gint y,
 205                                     guint time,
 206                                     wxDropTarget *drop_target )
 207 {
 208     if (g_isIdle) wxapp_install_idle_handler();
 209
 210     /* Owen Taylor: "if the coordinates not in a drop zone,
 211        return FALSE, otherwise call gtk_drag_status() and
 212        return TRUE" */
 213
 214     /* inform the wxDropTarget about the current GdkDragContext.
 215        this is only valid for the duration of this call */
 216     drop_target->SetDragContext( context );
 217
 218     // GTK+ always supposes that we want to copy the data by default while we
 219     // might want to move it, so examine not only suggested_action - which is
 220     // only good if we don't have our own preferences - but also the actions
 221     // field
 222     wxDragResult result;
 223     if (drop_target->GetDefaultAction() == wxDragNone)
 224     {
 225         // use default action set by wxDropSource::DoDragDrop()
 226     if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 227             (context->actions & GDK_ACTION_MOVE ) )
 228     {
 229         // move is requested by the program and allowed by GTK+ - do it, even
 230         // though suggested_action may be currently wxDragCopy
 231         result = wxDragMove;
 232     }
 233     else // use whatever GTK+ says we should
 234     {
 235         result = ConvertFromGTK(context->suggested_action);
 236
 237         if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 238         {
 239             // we're requested to move but we can't
 240             result = wxDragCopy;
 241         }
 242     }
 243     }
 244     else if (drop_target->GetDefaultAction() == wxDragMove &&
 245                 (context->actions & GDK_ACTION_MOVE))
 246     {
 247        result = wxDragMove;
 248     }
 249     else
 250     {
 251         if (context->actions & GDK_ACTION_COPY)
 252             result = wxDragCopy;
 253         else if (context->actions & GDK_ACTION_MOVE)
 254             result = wxDragMove;
 255         else
 256             result = wxDragNone;
 257     }
 258
 259     if (drop_target->m_firstMotion)
 260     {
 261         /* the first "drag_motion" event substitutes a "drag_enter" event */
 262         result = drop_target->OnEnter( x, y, result );
 263     }
 264     else
 265     {
 266         /* give program a chance to react (i.e. to say no by returning FALSE) */
 267         result = drop_target->OnDragOver( x, y, result );
 268     }
 269
 270     bool ret = wxIsDragResultOk( result );
 271     if (ret)
 272     {
 273         GdkDragAction action;
 274         if (result == wxDragCopy)
 275             action = GDK_ACTION_COPY;
 276         else if (result == wxDragLink)
 277             action = GDK_ACTION_LINK;
 278         else
 279             action = GDK_ACTION_MOVE;
 280
 281         gdk_drag_status( context, action, time );
 282     }
 283
 284     /* after this, invalidate the drop_target's GdkDragContext */
 285     drop_target->SetDragContext( (GdkDragContext*) NULL );
 286
 287     /* this has to be done because GDK has no "drag_enter" event */
 288     drop_target->m_firstMotion = false;
 289
 290     return ret;
 291 }
 292 }
 293
 294 // ----------------------------------------------------------------------------
 295 // "drag_drop"
 296 // ----------------------------------------------------------------------------
 297
 298 extern "C" {
 299 static gboolean target_drag_drop( GtkWidget *widget,
 300                                   GdkDragContext *context,
 301                                   gint x,
 302                                   gint y,
 303                                   guint time,
 304                                   wxDropTarget *drop_target )
 305 {
 306     if (g_isIdle) wxapp_install_idle_handler();
 307
 308     /* Owen Taylor: "if the drop is not in a drop zone,
 309        return FALSE, otherwise, if you aren't accepting
 310        the drop, call gtk_drag_finish() with success == FALSE
 311        otherwise call gtk_drag_data_get()" */
 312
 313 //    printf( "drop.\n" );
 314
 315     /* this seems to make a difference between not accepting
 316        due to wrong target area and due to wrong format. let
 317        us hope that this is not required.. */
 318
 319     /* inform the wxDropTarget about the current GdkDragContext.
 320        this is only valid for the duration of this call */
 321     drop_target->SetDragContext( context );
 322
 323     /* inform the wxDropTarget about the current drag widget.
 324        this is only valid for the duration of this call */
 325     drop_target->SetDragWidget( widget );
 326
 327     /* inform the wxDropTarget about the current drag time.
 328        this is only valid for the duration of this call */
 329     drop_target->SetDragTime( time );
 330
 331 /*
 332     wxDragResult result = wxDragMove;
 333     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 334 */
 335
 336     /* reset the block here as someone might very well
 337        show a dialog as a reaction to a drop and this
 338        wouldn't work without events */
 339     g_blockEventsOnDrag = false;
 340
 341     bool ret = drop_target->OnDrop( x, y );
 342
 343     if (!ret)
 344     {
 345         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 346
 347         /* cancel the whole thing */
 348         gtk_drag_finish( context,
 349                           FALSE,        /* no success */
 350                           FALSE,        /* don't delete data on dropping side */
 351                           time );
 352     }
 353     else
 354     {
 355         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned TRUE") );
 356
 357 #if wxUSE_THREADS
 358         /* disable GUI threads */
 359 #endif
 360
 361         GdkAtom format = drop_target->GetMatchingPair();
 362
 363         // this does happen somehow, see bug 555111
 364         wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") );
 365
 366 /*
 367         GdkDragAction action = GDK_ACTION_MOVE;
 368         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 369         context->action = action;
 370 */
 371         /* this should trigger an "drag_data_received" event */
 372         gtk_drag_get_data( widget,
 373                            context,
 374                            format,
 375                            time );
 376
 377 #if wxUSE_THREADS
 378         /* re-enable GUI threads */
 379 #endif
 380     }
 381
 382     /* after this, invalidate the drop_target's GdkDragContext */
 383     drop_target->SetDragContext( (GdkDragContext*) NULL );
 384
 385     /* after this, invalidate the drop_target's drag widget */
 386     drop_target->SetDragWidget( (GtkWidget*) NULL );
 387
 388     /* this has to be done because GDK has no "drag_enter" event */
 389     drop_target->m_firstMotion = true;
 390
 391     return ret;
 392 }
 393 }
 394
 395 // ----------------------------------------------------------------------------
 396 // "drag_data_received"
 397 // ----------------------------------------------------------------------------
 398
 399 extern "C" {
 400 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 401                                        GdkDragContext *context,
 402                                        gint x,
 403                                        gint y,
 404                                        GtkSelectionData *data,
 405                                        guint WXUNUSED(info),
 406                                        guint time,
 407                                        wxDropTarget *drop_target )
 408 {
 409     if (g_isIdle) wxapp_install_idle_handler();
 410
 411     /* Owen Taylor: "call gtk_drag_finish() with
 412        success == TRUE" */
 413
 414     if ((data->length <= 0) || (data->format != 8))
 415     {
 416         /* negative data length and non 8-bit data format
 417            qualifies for junk */
 418         gtk_drag_finish (context, FALSE, FALSE, time);
 419
 420         return;
 421     }
 422
 423     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 424
 425     /* inform the wxDropTarget about the current GtkSelectionData.
 426        this is only valid for the duration of this call */
 427     drop_target->SetDragData( data );
 428
 429     wxDragResult result = ConvertFromGTK(context->action);
 430
 431     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 432     {
 433         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned TRUE") );
 434
 435         /* tell GTK that data transfer was successful */
 436         gtk_drag_finish( context, TRUE, FALSE, time );
 437     }
 438     else
 439     {
 440         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 441
 442         /* tell GTK that data transfer was not successful */
 443         gtk_drag_finish( context, FALSE, FALSE, time );
 444     }
 445
 446     /* after this, invalidate the drop_target's drag data */
 447     drop_target->SetDragData( (GtkSelectionData*) NULL );
 448 }
 449 }
 450
 451 //----------------------------------------------------------------------------
 452 // wxDropTarget
 453 //----------------------------------------------------------------------------
 454
 455 wxDropTarget::wxDropTarget( wxDataObject *data )
 456             : wxDropTargetBase( data )
 457 {
 458     m_firstMotion = true;
 459     m_dragContext = (GdkDragContext*) NULL;
 460     m_dragWidget = (GtkWidget*) NULL;
 461     m_dragData = (GtkSelectionData*) NULL;
 462     m_dragTime = 0;
 463 }
 464
 465 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 466                                        wxCoord WXUNUSED(y),
 467                                        wxDragResult def )
 468 {
 469     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 470
 471     // disable the debug message from GetMatchingPair() - there are too many
 472     // of them otherwise
 473 #ifdef __WXDEBUG__
 474     wxLogNull noLog;
 475 #endif // Debug
 476
 477     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 478 }
 479
 480 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 481 {
 482     if (!m_dataObject)
 483         return false;
 484
 485     return (GetMatchingPair() != (GdkAtom) 0);
 486 }
 487
 488 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 489                                    wxDragResult def )
 490 {
 491     if (!m_dataObject)
 492         return wxDragNone;
 493
 494     if (GetMatchingPair() == (GdkAtom) 0)
 495         return wxDragNone;
 496
 497     return GetData() ? def : wxDragNone;
 498 }
 499
 500 GdkAtom wxDropTarget::GetMatchingPair()
 501 {
 502     if (!m_dataObject)
 503         return (GdkAtom) 0;
 504
 505     if (!m_dragContext)
 506         return (GdkAtom) 0;
 507
 508     GList *child = m_dragContext->targets;
 509     while (child)
 510     {
 511         GdkAtom formatAtom = GPOINTER_TO_INT(child->data);
 512         wxDataFormat format( formatAtom );
 513
 514 #ifdef __WXDEBUG__
 515         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 516                    format.GetId().c_str());
 517 #endif // Debug
 518
 519         if (m_dataObject->IsSupportedFormat( format ))
 520             return formatAtom;
 521
 522         child = child->next;
 523     }
 524
 525     return (GdkAtom) 0;
 526 }
 527
 528 bool wxDropTarget::GetData()
 529 {
 530     if (!m_dragData)
 531         return false;
 532
 533     if (!m_dataObject)
 534         return false;
 535
 536     wxDataFormat dragFormat( m_dragData->target );
 537
 538     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 539         return false;
 540
 541     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 542
 543     return true;
 544 }
 545
 546 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 547 {
 548     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 549
 550     gtk_drag_dest_unset( widget );
 551
 552     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 553                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 554
 555     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 556                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 557
 558     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 559                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 560
 561     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 562                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 563 }
 564
 565 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 566 {
 567     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 568
 569     /* gtk_drag_dest_set() determines what default behaviour we'd like
 570        GTK to supply. we don't want to specify out targets (=formats)
 571        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 572        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 573        "drag_motion" and "drag_drop" events. this makes it possible
 574        to allow dropping on only a small area. we should set
 575        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 576        highlighting if dragging over standard controls, but this
 577        seems to be broken without the other two. */
 578
 579     gtk_drag_dest_set( widget,
 580                        (GtkDestDefaults) 0,         /* no default behaviour */
 581                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 582                        0,                           /* number of targets = 0 */
 583                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 584
 585     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 586                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 587
 588     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 589                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 590
 591     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 592                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 593
 594     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 595                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 596 }
 597
 598 //----------------------------------------------------------------------------
 599 // "drag_data_get"
 600 //----------------------------------------------------------------------------
 601
 602 extern "C" {
 603 static void
 604 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 605                        GdkDragContext     *WXUNUSED(context),
 606                        GtkSelectionData   *selection_data,
 607                        guint               WXUNUSED(info),
 608                        guint               WXUNUSED(time),
 609                        wxDropSource       *drop_source )
 610 {
 611     if (g_isIdle) wxapp_install_idle_handler();
 612
 613     wxDataFormat format( selection_data->target );
 614
 615     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 616                format.GetId().c_str());
 617
 618     drop_source->m_retValue = wxDragCancel;
 619
 620     wxDataObject *data = drop_source->GetDataObject();
 621
 622     if (!data)
 623     {
 624         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 625         return;
 626     }
 627
 628     if (!data->IsSupportedFormat(format))
 629     {
 630         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 631         return;
 632     }
 633
 634     if (data->GetDataSize(format) == 0)
 635     {
 636         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 637         return;
 638     }
 639
 640     size_t size = data->GetDataSize(format);
 641
 642 //  printf( "data size: %d.\n", (int)data_size );
 643
 644     guchar *d = new guchar[size];
 645
 646     if (!data->GetDataHere( format, (void*)d ))
 647     {
 648         delete[] d;
 649         return;
 650     }
 651
 652 #if wxUSE_THREADS
 653     /* disable GUI threads */
 654 #endif
 655
 656     gtk_selection_data_set( selection_data,
 657                             selection_data->target,
 658                             8,   // 8-bit
 659                             d,
 660                             size );
 661
 662 #if wxUSE_THREADS
 663     /* enable GUI threads */
 664 #endif
 665
 666     delete[] d;
 667 }
 668 }
 669
 670 //----------------------------------------------------------------------------
 671 // "drag_data_delete"
 672 //----------------------------------------------------------------------------
 673
 674 extern "C" {
 675 static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
 676                                      GdkDragContext *context,
 677                                      wxDropSource *WXUNUSED(drop_source) )
 678 {
 679     if (g_isIdle)
 680         wxapp_install_idle_handler();
 681
 682     // printf( "Drag source: drag_data_delete\n" );
 683 }
 684 }
 685
 686 //----------------------------------------------------------------------------
 687 // "drag_begin"
 688 //----------------------------------------------------------------------------
 689
 690 extern "C" {
 691 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 692                                GdkDragContext     *WXUNUSED(context),
 693                                wxDropSource       *WXUNUSED(drop_source) )
 694 {
 695     if (g_isIdle)
 696         wxapp_install_idle_handler();
 697
 698     // printf( "Drag source: drag_begin.\n" );
 699 }
 700 }
 701
 702 //----------------------------------------------------------------------------
 703 // "drag_end"
 704 //----------------------------------------------------------------------------
 705
 706 extern "C" {
 707 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 708                              GdkDragContext     *WXUNUSED(context),
 709                              wxDropSource       *drop_source )
 710 {
 711     if (g_isIdle) wxapp_install_idle_handler();
 712
 713     // printf( "Drag source: drag_end.\n" );
 714
 715     drop_source->m_waiting = false;
 716 }
 717 }
 718
 719 //-----------------------------------------------------------------------------
 720 // "configure_event" from m_iconWindow
 721 //-----------------------------------------------------------------------------
 722
 723 extern "C" {
 724 static gint
 725 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 726 {
 727     if (g_isIdle)
 728         wxapp_install_idle_handler();
 729
 730     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 731
 732     return 0;
 733 }
 734 }
 735
 736 //---------------------------------------------------------------------------
 737 // wxDropSource
 738 //---------------------------------------------------------------------------
 739
 740 wxDropSource::wxDropSource(wxWindow *win,
 741                            const wxIcon &iconCopy,
 742                            const wxIcon &iconMove,
 743                            const wxIcon &iconNone)
 744 {
 745     m_waiting = true;
 746
 747     m_iconWindow = (GtkWidget*) NULL;
 748
 749     m_window = win;
 750     m_widget = win->m_widget;
 751     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 752
 753     m_retValue = wxDragCancel;
 754
 755     SetIcons(iconCopy, iconMove, iconNone);
 756 }
 757
 758 wxDropSource::wxDropSource(wxDataObject& data,
 759                            wxWindow *win,
 760                            const wxIcon &iconCopy,
 761                            const wxIcon &iconMove,
 762                            const wxIcon &iconNone)
 763 {
 764     m_waiting = true;
 765
 766     SetData( data );
 767
 768     m_iconWindow = (GtkWidget*) NULL;
 769
 770     m_window = win;
 771     m_widget = win->m_widget;
 772     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 773
 774     m_retValue = wxDragCancel;
 775
 776     SetIcons(iconCopy, iconMove, iconNone);
 777 }
 778
 779 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 780                             const wxIcon &iconMove,
 781                             const wxIcon &iconNone)
 782 {
 783     m_iconCopy = iconCopy;
 784     m_iconMove = iconMove;
 785     m_iconNone = iconNone;
 786
 787     if ( !m_iconCopy.Ok() )
 788         m_iconCopy = wxIcon(page_xpm);
 789     if ( !m_iconMove.Ok() )
 790         m_iconMove = m_iconCopy;
 791     if ( !m_iconNone.Ok() )
 792         m_iconNone = m_iconCopy;
 793 }
 794
 795 wxDropSource::~wxDropSource()
 796 {
 797 }
 798
 799 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 800 {
 801     // get the right icon to display
 802     wxIcon *icon = NULL;
 803     if ( action & GDK_ACTION_MOVE )
 804         icon = &m_iconMove;
 805     else if ( action & GDK_ACTION_COPY )
 806         icon = &m_iconCopy;
 807     else
 808         icon = &m_iconNone;
 809
 810     GdkBitmap *mask;
 811     if ( icon->GetMask() )
 812         mask = icon->GetMask()->GetBitmap();
 813     else
 814         mask = (GdkBitmap *)NULL;
 815
 816     GdkPixmap *pixmap = icon->GetPixmap();
 817
 818     gint width,height;
 819     gdk_window_get_size (pixmap, &width, &height);
 820
 821     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 822     gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
 823     gtk_widget_push_colormap (colormap);
 824
 825     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 826     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 827     gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
 828
 829     gtk_widget_pop_visual ();
 830     gtk_widget_pop_colormap ();
 831
 832     gtk_widget_set_usize (m_iconWindow, width, height);
 833     gtk_widget_realize (m_iconWindow);
 834
 835     gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
 836         GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
 837
 838     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 839
 840     if (mask)
 841         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 842
 843     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 844 }
 845
 846 wxDragResult wxDropSource::DoDragDrop(int flags)
 847 {
 848     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 849                  wxT("Drop source: no data") );
 850
 851     // still in drag
 852     if (g_blockEventsOnDrag)
 853         return wxDragNone;
 854
 855     // disabled for now
 856     g_blockEventsOnDrag = true;
 857
 858     RegisterWindow();
 859
 860     m_waiting = true;
 861
 862     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 863
 864     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 865     m_data->GetAllFormats( array );
 866     size_t count = m_data->GetFormatCount();
 867     for (size_t i = 0; i < count; i++)
 868     {
 869         GdkAtom atom = array[i];
 870         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 871         gtk_target_list_add( target_list, atom, 0, 0 );
 872     }
 873     delete[] array;
 874
 875     GdkEventMotion event;
 876     event.window = m_widget->window;
 877     int x = 0;
 878     int y = 0;
 879     GdkModifierType state;
 880     gdk_window_get_pointer( event.window, &x, &y, &state );
 881     event.x = x;
 882     event.y = y;
 883     event.state = state;
 884     event.time = (guint32)GDK_CURRENT_TIME;
 885
 886     /* GTK wants to know which button was pressed which caused the dragging */
 887     int button_number = 0;
 888     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 889     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 890     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 891
 892 #if wxUSE_THREADS
 893     /* disable GUI threads */
 894 #endif
 895
 896     /* don't start dragging if no button is down */
 897     if (button_number)
 898     {
 899         int action = GDK_ACTION_COPY;
 900         if ( flags & wxDrag_AllowMove )
 901             action |= GDK_ACTION_MOVE;
 902
 903         // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 904         //     to use a global to pass the flags to the drop target but I'd
 905         //     surely prefer a better way to do it
 906         gs_flagsForDrag = flags;
 907
 908         GdkDragContext *context = gtk_drag_begin( m_widget,
 909                 target_list,
 910                 (GdkDragAction)action,
 911                 button_number,  /* number of mouse button which started drag */
 912                 (GdkEvent*) &event );
 913
 914         m_dragContext = context;
 915
 916         PrepareIcon( action, context );
 917
 918         while (m_waiting)
 919             gtk_main_iteration();
 920
 921         m_retValue = ConvertFromGTK(context->action);
 922         if ( m_retValue == wxDragNone )
 923             m_retValue = wxDragCancel;
 924     }
 925
 926 #if wxUSE_THREADS
 927     /* re-enable GUI threads */
 928 #endif
 929
 930     g_blockEventsOnDrag = false;
 931
 932     UnregisterWindow();
 933
 934     return m_retValue;
 935 }
 936
 937 void wxDropSource::RegisterWindow()
 938 {
 939     if (!m_widget) return;
 940
 941     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 942                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 943     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 944                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 945     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 946                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 947     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 948                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 949
 950 }
 951
 952 void wxDropSource::UnregisterWindow()
 953 {
 954     if (!m_widget) return;
 955
 956     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 957                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 958     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 959                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 960     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 961                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 962     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 963                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 964 }
 965
 966 #endif
 967       // wxUSE_DRAG_AND_DROP