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 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #include "wx/dnd.h"
  14 #include "wx/log.h"
  15
  16
  17 #if wxUSE_DRAG_AND_DROP
  18
  19 #include "wx/window.h"
  20 #include "wx/app.h"
  21 #include "wx/gdicmn.h"
  22 #include "wx/intl.h"
  23 #include "wx/utils.h"
  24
  25 #include "wx/gtk/private.h"
  26
  27 #include <gdk/gdkprivate.h>
  28
  29 #include <gtk/gtkdnd.h>
  30 #include <gtk/gtkselection.h>
  31
  32 //-----------------------------------------------------------------------------
  33 // idle system
  34 //-----------------------------------------------------------------------------
  35
  36 extern void wxapp_install_idle_handler();
  37 extern bool g_isIdle;
  38
  39 //-----------------------------------------------------------------------------
  40 // thread system
  41 //-----------------------------------------------------------------------------
  42
  43 #if wxUSE_THREADS
  44 #endif
  45
  46 //----------------------------------------------------------------------------
  47 // global data
  48 //----------------------------------------------------------------------------
  49
  50 extern bool g_blockEventsOnDrag;
  51
  52 // the flags used for the last DoDragDrop()
  53 static long gs_flagsForDrag = 0;
  54
  55 // the trace mask we use with wxLogTrace() - call
  56 // wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
  57 // (there are quite a few of them, so don't enable this by default)
  58 static const wxChar *TRACE_DND = _T("dnd");
  59
  60 //----------------------------------------------------------------------------
  61 // standard icons
  62 //----------------------------------------------------------------------------
  63
  64 /* Copyright (c) Julian Smart */
  65 static const char * page_xpm[] = {
  66 /* columns rows colors chars-per-pixel */
  67 "32 32 37 1",
  68 "5 c #7198D9",
  69 ", c #769CDA",
  70 "2 c #DCE6F6",
  71 "i c #FFFFFF",
  72 "e c #779DDB",
  73 ": c #9AB6E4",
  74 "9 c #EAF0FA",
  75 "- c #B1C7EB",
  76 "$ c #6992D7",
  77 "y c #F7F9FD",
  78 "= c #BED0EE",
  79 "q c #F0F5FC",
  80 "; c #A8C0E8",
  81 "@ c #366BC2",
  82 "  c None",
  83 "u c #FDFEFF",
  84 "8 c #5987D3",
  85 "* c #C4D5F0",
  86 "7 c #7CA0DC",
  87 "O c #487BCE",
  88 "< c #6B94D7",
  89 "& c #CCDAF2",
  90 "> c #89A9DF",
  91 "3 c #5584D1",
  92 "w c #82A5DE",
  93 "1 c #3F74CB",
  94 "+ c #3A70CA",
  95 ". c #3569BF",
  96 "% c #D2DFF4",
  97 "# c #3366BB",
  98 "r c #F5F8FD",
  99 "0 c #FAFCFE",
 100 "4 c #DFE8F7",
 101 "X c #5E8AD4",
 102 "o c #5282D0",
 103 "t c #B8CCEC",
 104 "6 c #E5EDF9",
 105 /* pixels */
 106 "                                ",
 107 "                                ",
 108 "                                ",
 109 "                                ",
 110 "                                ",
 111 "       .XXXooOO++@#             ",
 112 "       $%&*=-;::>,<1            ",
 113 "       $2%&*=-;::><:3           ",
 114 "       $42%&*=-;::<&:3          ",
 115 "       56477<<<<8<<9&:X         ",
 116 "       59642%&*=-;<09&:5        ",
 117 "       5q9642%&*=-<<<<<#        ",
 118 "       5qqw777<<<<<88:>+        ",
 119 "       erqq9642%&*=t;::+        ",
 120 "       eyrqq9642%&*=t;:O        ",
 121 "       eyywwww777<<<<t;O        ",
 122 "       e0yyrqq9642%&*=to        ",
 123 "       e00yyrqq9642%&*=o        ",
 124 "       eu0wwwwwww777<&*X        ",
 125 "       euu00yyrqq9642%&X        ",
 126 "       eiuu00yyrqq9642%X        ",
 127 "       eiiwwwwwwwwww742$        ",
 128 "       eiiiuu00yyrqq964$        ",
 129 "       eiiiiuu00yyrqq96$        ",
 130 "       eiiiiiuu00yyrqq95        ",
 131 "       eiiiiiiuu00yyrqq5        ",
 132 "       eeeeeeeeeeeeee55e        ",
 133 "                                ",
 134 "                                ",
 135 "                                ",
 136 "                                ",
 137 "                                "
 138 };
 139
 140
 141 // ============================================================================
 142 // private functions
 143 // ============================================================================
 144
 145 // ----------------------------------------------------------------------------
 146 // convert between GTK+ and wxWidgets DND constants
 147 // ----------------------------------------------------------------------------
 148
 149 static wxDragResult ConvertFromGTK(long action)
 150 {
 151     switch ( action )
 152     {
 153         case GDK_ACTION_COPY:
 154             return wxDragCopy;
 155
 156         case GDK_ACTION_LINK:
 157             return wxDragLink;
 158
 159         case GDK_ACTION_MOVE:
 160             return wxDragMove;
 161     }
 162
 163     return wxDragNone;
 164 }
 165
 166 // ----------------------------------------------------------------------------
 167 // "drag_leave"
 168 // ----------------------------------------------------------------------------
 169
 170 extern "C" {
 171 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 172                                GdkDragContext *context,
 173                                guint WXUNUSED(time),
 174                                wxDropTarget *drop_target )
 175 {
 176     if (g_isIdle) wxapp_install_idle_handler();
 177
 178     /* inform the wxDropTarget about the current GdkDragContext.
 179        this is only valid for the duration of this call */
 180     drop_target->SetDragContext( context );
 181
 182     /* we don't need return values. this event is just for
 183        information */
 184     drop_target->OnLeave();
 185
 186     /* this has to be done because GDK has no "drag_enter" event */
 187     drop_target->m_firstMotion = true;
 188
 189     /* after this, invalidate the drop_target's GdkDragContext */
 190     drop_target->SetDragContext( (GdkDragContext*) NULL );
 191 }
 192 }
 193
 194 // ----------------------------------------------------------------------------
 195 // "drag_motion"
 196 // ----------------------------------------------------------------------------
 197
 198 extern "C" {
 199 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 200                                     GdkDragContext *context,
 201                                     gint x,
 202                                     gint y,
 203                                     guint time,
 204                                     wxDropTarget *drop_target )
 205 {
 206     if (g_isIdle) wxapp_install_idle_handler();
 207
 208     /* Owen Taylor: "if the coordinates not in a drop zone,
 209        return FALSE, otherwise call gtk_drag_status() and
 210        return TRUE" */
 211
 212     /* inform the wxDropTarget about the current GdkDragContext.
 213        this is only valid for the duration of this call */
 214     drop_target->SetDragContext( context );
 215
 216     // GTK+ always supposes that we want to copy the data by default while we
 217     // might want to move it, so examine not only suggested_action - which is
 218     // only good if we don't have our own preferences - but also the actions
 219     // field
 220     wxDragResult result;
 221     if (drop_target->GetDefaultAction() == wxDragNone)
 222     {
 223         // use default action set by wxDropSource::DoDragDrop()
 224     if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 225             (context->actions & GDK_ACTION_MOVE ) )
 226     {
 227         // move is requested by the program and allowed by GTK+ - do it, even
 228         // though suggested_action may be currently wxDragCopy
 229         result = wxDragMove;
 230     }
 231     else // use whatever GTK+ says we should
 232     {
 233         result = ConvertFromGTK(context->suggested_action);
 234
 235         if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 236         {
 237             // we're requested to move but we can't
 238             result = wxDragCopy;
 239         }
 240     }
 241     }
 242     else if (drop_target->GetDefaultAction() == wxDragMove &&
 243                 (context->actions & GDK_ACTION_MOVE))
 244     {
 245        result = wxDragMove;
 246     }
 247     else
 248     {
 249         if (context->actions & GDK_ACTION_COPY)
 250             result = wxDragCopy;
 251         else if (context->actions & GDK_ACTION_MOVE)
 252             result = wxDragMove;
 253         else
 254             result = wxDragNone;
 255     }
 256
 257     if (drop_target->m_firstMotion)
 258     {
 259         /* the first "drag_motion" event substitutes a "drag_enter" event */
 260         result = drop_target->OnEnter( x, y, result );
 261     }
 262     else
 263     {
 264         /* give program a chance to react (i.e. to say no by returning FALSE) */
 265         result = drop_target->OnDragOver( x, y, result );
 266     }
 267
 268     bool ret = wxIsDragResultOk( result );
 269     if (ret)
 270     {
 271         GdkDragAction action;
 272         if (result == wxDragCopy)
 273             action = GDK_ACTION_COPY;
 274         else if (result == wxDragLink)
 275             action = GDK_ACTION_LINK;
 276         else
 277             action = GDK_ACTION_MOVE;
 278
 279         gdk_drag_status( context, action, time );
 280     }
 281
 282     /* after this, invalidate the drop_target's GdkDragContext */
 283     drop_target->SetDragContext( (GdkDragContext*) NULL );
 284
 285     /* this has to be done because GDK has no "drag_enter" event */
 286     drop_target->m_firstMotion = false;
 287
 288     return ret;
 289 }
 290 }
 291
 292 // ----------------------------------------------------------------------------
 293 // "drag_drop"
 294 // ----------------------------------------------------------------------------
 295
 296 extern "C" {
 297 static gboolean target_drag_drop( GtkWidget *widget,
 298                                   GdkDragContext *context,
 299                                   gint x,
 300                                   gint y,
 301                                   guint time,
 302                                   wxDropTarget *drop_target )
 303 {
 304     if (g_isIdle) wxapp_install_idle_handler();
 305
 306     /* Owen Taylor: "if the drop is not in a drop zone,
 307        return FALSE, otherwise, if you aren't accepting
 308        the drop, call gtk_drag_finish() with success == FALSE
 309        otherwise call gtk_drag_data_get()" */
 310
 311 //    printf( "drop.\n" );
 312
 313     /* this seems to make a difference between not accepting
 314        due to wrong target area and due to wrong format. let
 315        us hope that this is not required.. */
 316
 317     /* inform the wxDropTarget about the current GdkDragContext.
 318        this is only valid for the duration of this call */
 319     drop_target->SetDragContext( context );
 320
 321     /* inform the wxDropTarget about the current drag widget.
 322        this is only valid for the duration of this call */
 323     drop_target->SetDragWidget( widget );
 324
 325     /* inform the wxDropTarget about the current drag time.
 326        this is only valid for the duration of this call */
 327     drop_target->SetDragTime( time );
 328
 329 /*
 330     wxDragResult result = wxDragMove;
 331     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 332 */
 333
 334     /* reset the block here as someone might very well
 335        show a dialog as a reaction to a drop and this
 336        wouldn't work without events */
 337     g_blockEventsOnDrag = false;
 338
 339     bool ret = drop_target->OnDrop( x, y );
 340
 341     if (!ret)
 342     {
 343         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 344
 345         /* cancel the whole thing */
 346         gtk_drag_finish( context,
 347                           FALSE,        /* no success */
 348                           FALSE,        /* don't delete data on dropping side */
 349                           time );
 350     }
 351     else
 352     {
 353         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned TRUE") );
 354
 355 #if wxUSE_THREADS
 356         /* disable GUI threads */
 357 #endif
 358
 359         GdkAtom format = drop_target->GetMatchingPair();
 360
 361         // this does happen somehow, see bug 555111
 362         wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") )
 363
 364 /*
 365         GdkDragAction action = GDK_ACTION_MOVE;
 366         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 367         context->action = action;
 368 */
 369         /* this should trigger an "drag_data_received" event */
 370         gtk_drag_get_data( widget,
 371                            context,
 372                            format,
 373                            time );
 374
 375 #if wxUSE_THREADS
 376         /* re-enable GUI threads */
 377 #endif
 378     }
 379
 380     /* after this, invalidate the drop_target's GdkDragContext */
 381     drop_target->SetDragContext( (GdkDragContext*) NULL );
 382
 383     /* after this, invalidate the drop_target's drag widget */
 384     drop_target->SetDragWidget( (GtkWidget*) NULL );
 385
 386     /* this has to be done because GDK has no "drag_enter" event */
 387     drop_target->m_firstMotion = true;
 388
 389     return ret;
 390 }
 391 }
 392
 393 // ----------------------------------------------------------------------------
 394 // "drag_data_received"
 395 // ----------------------------------------------------------------------------
 396
 397 extern "C" {
 398 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 399                                        GdkDragContext *context,
 400                                        gint x,
 401                                        gint y,
 402                                        GtkSelectionData *data,
 403                                        guint WXUNUSED(info),
 404                                        guint time,
 405                                        wxDropTarget *drop_target )
 406 {
 407     if (g_isIdle) wxapp_install_idle_handler();
 408
 409     /* Owen Taylor: "call gtk_drag_finish() with
 410        success == TRUE" */
 411
 412     if ((data->length <= 0) || (data->format != 8))
 413     {
 414         /* negative data length and non 8-bit data format
 415            qualifies for junk */
 416         gtk_drag_finish (context, FALSE, FALSE, time);
 417
 418         return;
 419     }
 420
 421     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 422
 423     /* inform the wxDropTarget about the current GtkSelectionData.
 424        this is only valid for the duration of this call */
 425     drop_target->SetDragData( data );
 426
 427     wxDragResult result = ConvertFromGTK(context->action);
 428
 429     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 430     {
 431         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned TRUE") );
 432
 433         /* tell GTK that data transfer was successful */
 434         gtk_drag_finish( context, TRUE, FALSE, time );
 435     }
 436     else
 437     {
 438         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 439
 440         /* tell GTK that data transfer was not successful */
 441         gtk_drag_finish( context, FALSE, FALSE, time );
 442     }
 443
 444     /* after this, invalidate the drop_target's drag data */
 445     drop_target->SetDragData( (GtkSelectionData*) NULL );
 446 }
 447 }
 448
 449 //----------------------------------------------------------------------------
 450 // wxDropTarget
 451 //----------------------------------------------------------------------------
 452
 453 wxDropTarget::wxDropTarget( wxDataObject *data )
 454             : wxDropTargetBase( data )
 455 {
 456     m_firstMotion = true;
 457     m_dragContext = (GdkDragContext*) NULL;
 458     m_dragWidget = (GtkWidget*) NULL;
 459     m_dragData = (GtkSelectionData*) NULL;
 460     m_dragTime = 0;
 461 }
 462
 463 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 464                                        wxCoord WXUNUSED(y),
 465                                        wxDragResult def )
 466 {
 467     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 468
 469     // disable the debug message from GetMatchingPair() - there are too many
 470     // of them otherwise
 471 #ifdef __WXDEBUG__
 472     wxLogNull noLog;
 473 #endif // Debug
 474
 475     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 476 }
 477
 478 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 479 {
 480     if (!m_dataObject)
 481         return false;
 482
 483     return (GetMatchingPair() != (GdkAtom) 0);
 484 }
 485
 486 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 487                                    wxDragResult def )
 488 {
 489     if (!m_dataObject)
 490         return wxDragNone;
 491
 492     if (GetMatchingPair() == (GdkAtom) 0)
 493         return wxDragNone;
 494
 495     return GetData() ? def : wxDragNone;
 496 }
 497
 498 GdkAtom wxDropTarget::GetMatchingPair()
 499 {
 500     if (!m_dataObject)
 501         return (GdkAtom) 0;
 502
 503     if (!m_dragContext)
 504         return (GdkAtom) 0;
 505
 506     GList *child = m_dragContext->targets;
 507     while (child)
 508     {
 509         GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
 510         wxDataFormat format( formatAtom );
 511
 512 #ifdef __WXDEBUG__
 513         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 514                    format.GetId().c_str());
 515 #endif // Debug
 516
 517         if (m_dataObject->IsSupportedFormat( format ))
 518             return formatAtom;
 519
 520         child = child->next;
 521     }
 522
 523     return (GdkAtom) 0;
 524 }
 525
 526 bool wxDropTarget::GetData()
 527 {
 528     if (!m_dragData)
 529         return false;
 530
 531     if (!m_dataObject)
 532         return false;
 533
 534     wxDataFormat dragFormat( m_dragData->target );
 535
 536     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 537         return false;
 538
 539     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 540
 541     return true;
 542 }
 543
 544 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 545 {
 546     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 547
 548     gtk_drag_dest_unset( widget );
 549
 550     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 551                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 552
 553     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 554                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 555
 556     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 557                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 558
 559     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 560                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 561 }
 562
 563 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 564 {
 565     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 566
 567     /* gtk_drag_dest_set() determines what default behaviour we'd like
 568        GTK to supply. we don't want to specify out targets (=formats)
 569        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 570        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 571        "drag_motion" and "drag_drop" events. this makes it possible
 572        to allow dropping on only a small area. we should set
 573        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 574        highlighting if dragging over standard controls, but this
 575        seems to be broken without the other two. */
 576
 577     gtk_drag_dest_set( widget,
 578                        (GtkDestDefaults) 0,         /* no default behaviour */
 579                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 580                        0,                           /* number of targets = 0 */
 581                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 582
 583     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 584                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 585
 586     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 587                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 588
 589     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 590                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 591
 592     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 593                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 594 }
 595
 596 //----------------------------------------------------------------------------
 597 // "drag_data_get"
 598 //----------------------------------------------------------------------------
 599
 600 extern "C" {
 601 static void
 602 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 603                        GdkDragContext     *WXUNUSED(context),
 604                        GtkSelectionData   *selection_data,
 605                        guint               WXUNUSED(info),
 606                        guint               WXUNUSED(time),
 607                        wxDropSource       *drop_source )
 608 {
 609     if (g_isIdle) wxapp_install_idle_handler();
 610
 611     wxDataFormat format( selection_data->target );
 612
 613     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 614                format.GetId().c_str());
 615
 616     drop_source->m_retValue = wxDragCancel;
 617
 618     wxDataObject *data = drop_source->GetDataObject();
 619
 620     if (!data)
 621     {
 622         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 623         return;
 624     }
 625
 626     if (!data->IsSupportedFormat(format))
 627     {
 628         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 629         return;
 630     }
 631
 632     if (data->GetDataSize(format) == 0)
 633     {
 634         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 635         return;
 636     }
 637
 638     size_t size = data->GetDataSize(format);
 639
 640 //  printf( "data size: %d.\n", (int)data_size );
 641
 642     guchar *d = new guchar[size];
 643
 644     if (!data->GetDataHere( format, (void*)d ))
 645     {
 646         delete[] d;
 647         return;
 648     }
 649
 650 #if wxUSE_THREADS
 651     /* disable GUI threads */
 652 #endif
 653
 654     gtk_selection_data_set( selection_data,
 655                             selection_data->target,
 656                             8,   // 8-bit
 657                             d,
 658                             size );
 659
 660 #if wxUSE_THREADS
 661     /* enable GUI threads */
 662 #endif
 663
 664     delete[] d;
 665 }
 666 }
 667
 668 //----------------------------------------------------------------------------
 669 // "drag_data_delete"
 670 //----------------------------------------------------------------------------
 671
 672 extern "C" {
 673 static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
 674                                      GdkDragContext *context,
 675                                      wxDropSource *WXUNUSED(drop_source) )
 676 {
 677     if (g_isIdle)
 678         wxapp_install_idle_handler();
 679
 680     // printf( "Drag source: drag_data_delete\n" );
 681 }
 682 }
 683
 684 //----------------------------------------------------------------------------
 685 // "drag_begin"
 686 //----------------------------------------------------------------------------
 687
 688 extern "C" {
 689 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 690                                GdkDragContext     *WXUNUSED(context),
 691                                wxDropSource       *WXUNUSED(drop_source) )
 692 {
 693     if (g_isIdle)
 694         wxapp_install_idle_handler();
 695
 696     // printf( "Drag source: drag_begin.\n" );
 697 }
 698 }
 699
 700 //----------------------------------------------------------------------------
 701 // "drag_end"
 702 //----------------------------------------------------------------------------
 703
 704 extern "C" {
 705 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 706                              GdkDragContext     *WXUNUSED(context),
 707                              wxDropSource       *drop_source )
 708 {
 709     if (g_isIdle) wxapp_install_idle_handler();
 710
 711     // printf( "Drag source: drag_end.\n" );
 712
 713     drop_source->m_waiting = false;
 714 }
 715 }
 716
 717 //-----------------------------------------------------------------------------
 718 // "configure_event" from m_iconWindow
 719 //-----------------------------------------------------------------------------
 720
 721 extern "C" {
 722 static gint
 723 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 724 {
 725     if (g_isIdle)
 726         wxapp_install_idle_handler();
 727
 728     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 729
 730     return 0;
 731 }
 732 }
 733
 734 //---------------------------------------------------------------------------
 735 // wxDropSource
 736 //---------------------------------------------------------------------------
 737
 738 wxDropSource::wxDropSource(wxWindow *win,
 739                            const wxIcon &iconCopy,
 740                            const wxIcon &iconMove,
 741                            const wxIcon &iconNone)
 742 {
 743     m_waiting = true;
 744
 745     m_iconWindow = (GtkWidget*) NULL;
 746
 747     m_window = win;
 748     m_widget = win->m_widget;
 749     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 750
 751     m_retValue = wxDragCancel;
 752
 753     SetIcons(iconCopy, iconMove, iconNone);
 754 }
 755
 756 wxDropSource::wxDropSource(wxDataObject& data,
 757                            wxWindow *win,
 758                            const wxIcon &iconCopy,
 759                            const wxIcon &iconMove,
 760                            const wxIcon &iconNone)
 761 {
 762     m_waiting = true;
 763
 764     SetData( data );
 765
 766     m_iconWindow = (GtkWidget*) NULL;
 767
 768     m_window = win;
 769     m_widget = win->m_widget;
 770     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 771
 772     m_retValue = wxDragCancel;
 773
 774     SetIcons(iconCopy, iconMove, iconNone);
 775 }
 776
 777 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 778                             const wxIcon &iconMove,
 779                             const wxIcon &iconNone)
 780 {
 781     m_iconCopy = iconCopy;
 782     m_iconMove = iconMove;
 783     m_iconNone = iconNone;
 784
 785     if ( !m_iconCopy.Ok() )
 786         m_iconCopy = wxIcon(page_xpm);
 787     if ( !m_iconMove.Ok() )
 788         m_iconMove = m_iconCopy;
 789     if ( !m_iconNone.Ok() )
 790         m_iconNone = m_iconCopy;
 791 }
 792
 793 wxDropSource::~wxDropSource()
 794 {
 795 }
 796
 797 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 798 {
 799     // get the right icon to display
 800     wxIcon *icon = NULL;
 801     if ( action & GDK_ACTION_MOVE )
 802         icon = &m_iconMove;
 803     else if ( action & GDK_ACTION_COPY )
 804         icon = &m_iconCopy;
 805     else
 806         icon = &m_iconNone;
 807
 808     GdkBitmap *mask;
 809     if ( icon->GetMask() )
 810         mask = icon->GetMask()->GetBitmap();
 811     else
 812         mask = (GdkBitmap *)NULL;
 813
 814     GdkPixmap *pixmap = icon->GetPixmap();
 815
 816     gint width,height;
 817     gdk_window_get_size (pixmap, &width, &height);
 818
 819     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 820 #ifndef __WXGTK20__
 821     gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
 822 #endif
 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 #ifndef __WXGTK20__
 830     gtk_widget_pop_visual ();
 831 #endif
 832     gtk_widget_pop_colormap ();
 833
 834     gtk_widget_set_usize (m_iconWindow, width, height);
 835     gtk_widget_realize (m_iconWindow);
 836
 837     gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
 838         GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
 839
 840     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 841
 842     if (mask)
 843         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 844
 845     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 846 }
 847
 848 wxDragResult wxDropSource::DoDragDrop(int flags)
 849 {
 850     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 851                  wxT("Drop source: no data") );
 852
 853     // still in drag
 854     if (g_blockEventsOnDrag)
 855         return wxDragNone;
 856
 857     // disabled for now
 858     g_blockEventsOnDrag = true;
 859
 860     RegisterWindow();
 861
 862     m_waiting = true;
 863
 864     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 865
 866     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 867     m_data->GetAllFormats( array );
 868     size_t count = m_data->GetFormatCount();
 869     for (size_t i = 0; i < count; i++)
 870     {
 871         GdkAtom atom = array[i];
 872         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 873         gtk_target_list_add( target_list, atom, 0, 0 );
 874     }
 875     delete[] array;
 876
 877     GdkEventMotion event;
 878     event.window = m_widget->window;
 879     int x = 0;
 880     int y = 0;
 881     GdkModifierType state;
 882     gdk_window_get_pointer( event.window, &x, &y, &state );
 883     event.x = x;
 884     event.y = y;
 885     event.state = state;
 886     event.time = (guint32)GDK_CURRENT_TIME;
 887
 888     /* GTK wants to know which button was pressed which caused the dragging */
 889     int button_number = 0;
 890     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 891     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 892     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 893
 894 #if wxUSE_THREADS
 895     /* disable GUI threads */
 896 #endif
 897
 898     /* don't start dragging if no button is down */
 899     if (button_number)
 900     {
 901         int action = GDK_ACTION_COPY;
 902         if ( flags & wxDrag_AllowMove )
 903             action |= GDK_ACTION_MOVE;
 904
 905         // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 906         //     to use a global to pass the flags to the drop target but I'd
 907         //     surely prefer a better way to do it
 908         gs_flagsForDrag = flags;
 909
 910         GdkDragContext *context = gtk_drag_begin( m_widget,
 911                 target_list,
 912                 (GdkDragAction)action,
 913                 button_number,  /* number of mouse button which started drag */
 914                 (GdkEvent*) &event );
 915
 916         m_dragContext = context;
 917
 918         PrepareIcon( action, context );
 919
 920         while (m_waiting)
 921             gtk_main_iteration();
 922
 923         m_retValue = ConvertFromGTK(context->action);
 924         if ( m_retValue == wxDragNone )
 925             m_retValue = wxDragCancel;
 926     }
 927
 928 #if wxUSE_THREADS
 929     /* re-enable GUI threads */
 930 #endif
 931
 932     g_blockEventsOnDrag = false;
 933
 934     UnregisterWindow();
 935
 936     return m_retValue;
 937 }
 938
 939 void wxDropSource::RegisterWindow()
 940 {
 941     if (!m_widget) return;
 942
 943     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 944                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 945     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 946                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 947     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 948                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 949     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 950                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 951
 952 }
 953
 954 void wxDropSource::UnregisterWindow()
 955 {
 956     if (!m_widget) return;
 957
 958     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 959                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 960     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 961                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 962     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 963                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 964     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 965                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 966 }
 967
 968 #endif
 969       // wxUSE_DRAG_AND_DROP