src/gtk1/dnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk1/dnd.cpp
   3 // Purpose:     wxDropTarget class
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #if wxUSE_DRAG_AND_DROP
  14
  15 #include "wx/dnd.h"
  16
  17 #ifndef WX_PRECOMP
  18     #include "wx/intl.h"
  19     #include "wx/log.h"
  20     #include "wx/app.h"
  21     #include "wx/utils.h"
  22     #include "wx/window.h"
  23     #include "wx/gdicmn.h"
  24 #endif
  25
  26 #include "wx/gtk1/private.h"
  27
  28 #include <gdk/gdkprivate.h>
  29
  30 #include <gtk/gtkdnd.h>
  31 #include <gtk/gtkselection.h>
  32
  33 //-----------------------------------------------------------------------------
  34 // idle system
  35 //-----------------------------------------------------------------------------
  36
  37 extern void wxapp_install_idle_handler();
  38 extern bool g_isIdle;
  39
  40 //-----------------------------------------------------------------------------
  41 // thread system
  42 //-----------------------------------------------------------------------------
  43
  44 #if wxUSE_THREADS
  45 #endif
  46
  47 //----------------------------------------------------------------------------
  48 // global data
  49 //----------------------------------------------------------------------------
  50
  51 extern bool g_blockEventsOnDrag;
  52
  53 // the flags used for the last DoDragDrop()
  54 static long gs_flagsForDrag = 0;
  55
  56 #ifdef __WXDEBUG__
  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 #endif
  62
  63 // global variables because GTK+ DnD want to have the
  64 // mouse event that caused it
  65 extern GdkEvent *g_lastMouseEvent;
  66 extern int g_lastButtonNumber;
  67
  68 //----------------------------------------------------------------------------
  69 // standard icons
  70 //----------------------------------------------------------------------------
  71
  72 /* Copyright (c) Julian Smart */
  73 static const char * page_xpm[] = {
  74 /* columns rows colors chars-per-pixel */
  75 "32 32 37 1",
  76 "5 c #7198D9",
  77 ", c #769CDA",
  78 "2 c #DCE6F6",
  79 "i c #FFFFFF",
  80 "e c #779DDB",
  81 ": c #9AB6E4",
  82 "9 c #EAF0FA",
  83 "- c #B1C7EB",
  84 "$ c #6992D7",
  85 "y c #F7F9FD",
  86 "= c #BED0EE",
  87 "q c #F0F5FC",
  88 "; c #A8C0E8",
  89 "@ c #366BC2",
  90 "  c None",
  91 "u c #FDFEFF",
  92 "8 c #5987D3",
  93 "* c #C4D5F0",
  94 "7 c #7CA0DC",
  95 "O c #487BCE",
  96 "< c #6B94D7",
  97 "& c #CCDAF2",
  98 "> c #89A9DF",
  99 "3 c #5584D1",
 100 "w c #82A5DE",
 101 "1 c #3F74CB",
 102 "+ c #3A70CA",
 103 ". c #3569BF",
 104 "% c #D2DFF4",
 105 "# c #3366BB",
 106 "r c #F5F8FD",
 107 "0 c #FAFCFE",
 108 "4 c #DFE8F7",
 109 "X c #5E8AD4",
 110 "o c #5282D0",
 111 "t c #B8CCEC",
 112 "6 c #E5EDF9",
 113 /* pixels */
 114 "                                ",
 115 "                                ",
 116 "                                ",
 117 "                                ",
 118 "                                ",
 119 "       .XXXooOO++@#             ",
 120 "       $%&*=-;::>,<1            ",
 121 "       $2%&*=-;::><:3           ",
 122 "       $42%&*=-;::<&:3          ",
 123 "       56477<<<<8<<9&:X         ",
 124 "       59642%&*=-;<09&:5        ",
 125 "       5q9642%&*=-<<<<<#        ",
 126 "       5qqw777<<<<<88:>+        ",
 127 "       erqq9642%&*=t;::+        ",
 128 "       eyrqq9642%&*=t;:O        ",
 129 "       eyywwww777<<<<t;O        ",
 130 "       e0yyrqq9642%&*=to        ",
 131 "       e00yyrqq9642%&*=o        ",
 132 "       eu0wwwwwww777<&*X        ",
 133 "       euu00yyrqq9642%&X        ",
 134 "       eiuu00yyrqq9642%X        ",
 135 "       eiiwwwwwwwwww742$        ",
 136 "       eiiiuu00yyrqq964$        ",
 137 "       eiiiiuu00yyrqq96$        ",
 138 "       eiiiiiuu00yyrqq95        ",
 139 "       eiiiiiiuu00yyrqq5        ",
 140 "       eeeeeeeeeeeeee55e        ",
 141 "                                ",
 142 "                                ",
 143 "                                ",
 144 "                                ",
 145 "                                "
 146 };
 147
 148
 149 // ============================================================================
 150 // private functions
 151 // ============================================================================
 152
 153 // ----------------------------------------------------------------------------
 154 // convert between GTK+ and wxWidgets DND constants
 155 // ----------------------------------------------------------------------------
 156
 157 static wxDragResult ConvertFromGTK(long action)
 158 {
 159     switch ( action )
 160     {
 161         case GDK_ACTION_COPY:
 162             return wxDragCopy;
 163
 164         case GDK_ACTION_LINK:
 165             return wxDragLink;
 166
 167         case GDK_ACTION_MOVE:
 168             return wxDragMove;
 169     }
 170
 171     return wxDragNone;
 172 }
 173
 174 // ----------------------------------------------------------------------------
 175 // "drag_leave"
 176 // ----------------------------------------------------------------------------
 177
 178 extern "C" {
 179 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 180                                GdkDragContext *context,
 181                                guint WXUNUSED(time),
 182                                wxDropTarget *drop_target )
 183 {
 184     if (g_isIdle) wxapp_install_idle_handler();
 185
 186     /* inform the wxDropTarget about the current GdkDragContext.
 187        this is only valid for the duration of this call */
 188     drop_target->SetDragContext( context );
 189
 190     /* we don't need return values. this event is just for
 191        information */
 192     drop_target->OnLeave();
 193
 194     /* this has to be done because GDK has no "drag_enter" event */
 195     drop_target->m_firstMotion = true;
 196
 197     /* after this, invalidate the drop_target's GdkDragContext */
 198     drop_target->SetDragContext( (GdkDragContext*) NULL );
 199 }
 200 }
 201
 202 // ----------------------------------------------------------------------------
 203 // "drag_motion"
 204 // ----------------------------------------------------------------------------
 205
 206 extern "C" {
 207 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 208                                     GdkDragContext *context,
 209                                     gint x,
 210                                     gint y,
 211                                     guint time,
 212                                     wxDropTarget *drop_target )
 213 {
 214     if (g_isIdle) wxapp_install_idle_handler();
 215
 216     /* Owen Taylor: "if the coordinates not in a drop zone,
 217        return FALSE, otherwise call gtk_drag_status() and
 218        return TRUE" */
 219
 220     /* inform the wxDropTarget about the current GdkDragContext.
 221        this is only valid for the duration of this call */
 222     drop_target->SetDragContext( context );
 223
 224     // GTK+ always supposes that we want to copy the data by default while we
 225     // might want to move it, so examine not only suggested_action - which is
 226     // only good if we don't have our own preferences - but also the actions
 227     // field
 228     wxDragResult result;
 229     if (drop_target->GetDefaultAction() == wxDragNone)
 230     {
 231         // use default action set by wxDropSource::DoDragDrop()
 232     if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 233             (context->actions & GDK_ACTION_MOVE ) )
 234     {
 235         // move is requested by the program and allowed by GTK+ - do it, even
 236         // though suggested_action may be currently wxDragCopy
 237         result = wxDragMove;
 238     }
 239     else // use whatever GTK+ says we should
 240     {
 241         result = ConvertFromGTK(context->suggested_action);
 242
 243         if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 244         {
 245             // we're requested to move but we can't
 246             result = wxDragCopy;
 247         }
 248     }
 249     }
 250     else if (drop_target->GetDefaultAction() == wxDragMove &&
 251                 (context->actions & GDK_ACTION_MOVE))
 252     {
 253        result = wxDragMove;
 254     }
 255     else
 256     {
 257         if (context->actions & GDK_ACTION_COPY)
 258             result = wxDragCopy;
 259         else if (context->actions & GDK_ACTION_MOVE)
 260             result = wxDragMove;
 261         else
 262             result = wxDragNone;
 263     }
 264
 265     if (drop_target->m_firstMotion)
 266     {
 267         /* the first "drag_motion" event substitutes a "drag_enter" event */
 268         result = drop_target->OnEnter( x, y, result );
 269     }
 270     else
 271     {
 272         /* give program a chance to react (i.e. to say no by returning FALSE) */
 273         result = drop_target->OnDragOver( x, y, result );
 274     }
 275
 276     bool ret = wxIsDragResultOk( result );
 277     if (ret)
 278     {
 279         GdkDragAction action;
 280         if (result == wxDragCopy)
 281             action = GDK_ACTION_COPY;
 282         else if (result == wxDragLink)
 283             action = GDK_ACTION_LINK;
 284         else
 285             action = GDK_ACTION_MOVE;
 286
 287         gdk_drag_status( context, action, time );
 288     }
 289
 290     /* after this, invalidate the drop_target's GdkDragContext */
 291     drop_target->SetDragContext( (GdkDragContext*) NULL );
 292
 293     /* this has to be done because GDK has no "drag_enter" event */
 294     drop_target->m_firstMotion = false;
 295
 296     return ret;
 297 }
 298 }
 299
 300 // ----------------------------------------------------------------------------
 301 // "drag_drop"
 302 // ----------------------------------------------------------------------------
 303
 304 extern "C" {
 305 static gboolean target_drag_drop( GtkWidget *widget,
 306                                   GdkDragContext *context,
 307                                   gint x,
 308                                   gint y,
 309                                   guint time,
 310                                   wxDropTarget *drop_target )
 311 {
 312     if (g_isIdle) wxapp_install_idle_handler();
 313
 314     /* Owen Taylor: "if the drop is not in a drop zone,
 315        return FALSE, otherwise, if you aren't accepting
 316        the drop, call gtk_drag_finish() with success == FALSE
 317        otherwise call gtk_drag_data_get()" */
 318
 319 //    printf( "drop.\n" );
 320
 321     /* this seems to make a difference between not accepting
 322        due to wrong target area and due to wrong format. let
 323        us hope that this is not required.. */
 324
 325     /* inform the wxDropTarget about the current GdkDragContext.
 326        this is only valid for the duration of this call */
 327     drop_target->SetDragContext( context );
 328
 329     /* inform the wxDropTarget about the current drag widget.
 330        this is only valid for the duration of this call */
 331     drop_target->SetDragWidget( widget );
 332
 333     /* inform the wxDropTarget about the current drag time.
 334        this is only valid for the duration of this call */
 335     drop_target->SetDragTime( time );
 336
 337 /*
 338     wxDragResult result = wxDragMove;
 339     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 340 */
 341
 342     /* reset the block here as someone might very well
 343        show a dialog as a reaction to a drop and this
 344        wouldn't work without events */
 345     g_blockEventsOnDrag = false;
 346
 347     bool ret = drop_target->OnDrop( x, y );
 348
 349     if (!ret)
 350     {
 351         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 352
 353         /* cancel the whole thing */
 354         gtk_drag_finish( context,
 355                           FALSE,        /* no success */
 356                           FALSE,        /* don't delete data on dropping side */
 357                           time );
 358     }
 359     else
 360     {
 361         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned TRUE") );
 362
 363 #if wxUSE_THREADS
 364         /* disable GUI threads */
 365 #endif
 366
 367         GdkAtom format = drop_target->GetMatchingPair();
 368
 369         // this does happen somehow, see bug 555111
 370         wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") );
 371
 372 /*
 373         GdkDragAction action = GDK_ACTION_MOVE;
 374         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 375         context->action = action;
 376 */
 377         /* this should trigger an "drag_data_received" event */
 378         gtk_drag_get_data( widget,
 379                            context,
 380                            format,
 381                            time );
 382
 383 #if wxUSE_THREADS
 384         /* re-enable GUI threads */
 385 #endif
 386     }
 387
 388     /* after this, invalidate the drop_target's GdkDragContext */
 389     drop_target->SetDragContext( (GdkDragContext*) NULL );
 390
 391     /* after this, invalidate the drop_target's drag widget */
 392     drop_target->SetDragWidget( (GtkWidget*) NULL );
 393
 394     /* this has to be done because GDK has no "drag_enter" event */
 395     drop_target->m_firstMotion = true;
 396
 397     return ret;
 398 }
 399 }
 400
 401 // ----------------------------------------------------------------------------
 402 // "drag_data_received"
 403 // ----------------------------------------------------------------------------
 404
 405 extern "C" {
 406 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 407                                        GdkDragContext *context,
 408                                        gint x,
 409                                        gint y,
 410                                        GtkSelectionData *data,
 411                                        guint WXUNUSED(info),
 412                                        guint time,
 413                                        wxDropTarget *drop_target )
 414 {
 415     if (g_isIdle) wxapp_install_idle_handler();
 416
 417     /* Owen Taylor: "call gtk_drag_finish() with
 418        success == TRUE" */
 419
 420     if ((data->length <= 0) || (data->format != 8))
 421     {
 422         /* negative data length and non 8-bit data format
 423            qualifies for junk */
 424         gtk_drag_finish (context, FALSE, FALSE, time);
 425
 426         return;
 427     }
 428
 429     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 430
 431     /* inform the wxDropTarget about the current GtkSelectionData.
 432        this is only valid for the duration of this call */
 433     drop_target->SetDragData( data );
 434
 435     wxDragResult result = ConvertFromGTK(context->action);
 436
 437     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 438     {
 439         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned TRUE") );
 440
 441         /* tell GTK that data transfer was successful */
 442         gtk_drag_finish( context, TRUE, FALSE, time );
 443     }
 444     else
 445     {
 446         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 447
 448         /* tell GTK that data transfer was not successful */
 449         gtk_drag_finish( context, FALSE, FALSE, time );
 450     }
 451
 452     /* after this, invalidate the drop_target's drag data */
 453     drop_target->SetDragData( (GtkSelectionData*) NULL );
 454 }
 455 }
 456
 457 //----------------------------------------------------------------------------
 458 // wxDropTarget
 459 //----------------------------------------------------------------------------
 460
 461 wxDropTarget::wxDropTarget( wxDataObject *data )
 462             : wxDropTargetBase( data )
 463 {
 464     m_firstMotion = true;
 465     m_dragContext = (GdkDragContext*) NULL;
 466     m_dragWidget = (GtkWidget*) NULL;
 467     m_dragData = (GtkSelectionData*) NULL;
 468     m_dragTime = 0;
 469 }
 470
 471 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 472                                        wxCoord WXUNUSED(y),
 473                                        wxDragResult def )
 474 {
 475     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 476
 477     // disable the debug message from GetMatchingPair() - there are too many
 478     // of them otherwise
 479 #ifdef __WXDEBUG__
 480     wxLogNull noLog;
 481 #endif // Debug
 482
 483     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 484 }
 485
 486 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 487 {
 488     if (!m_dataObject)
 489         return false;
 490
 491     return (GetMatchingPair() != (GdkAtom) 0);
 492 }
 493
 494 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 495                                    wxDragResult def )
 496 {
 497     if (!m_dataObject)
 498         return wxDragNone;
 499
 500     if (GetMatchingPair() == (GdkAtom) 0)
 501         return wxDragNone;
 502
 503     return GetData() ? def : wxDragNone;
 504 }
 505
 506 GdkAtom wxDropTarget::GetMatchingPair()
 507 {
 508     if (!m_dataObject)
 509         return (GdkAtom) 0;
 510
 511     if (!m_dragContext)
 512         return (GdkAtom) 0;
 513
 514     GList *child = m_dragContext->targets;
 515     while (child)
 516     {
 517         GdkAtom formatAtom = GPOINTER_TO_INT(child->data);
 518         wxDataFormat format( formatAtom );
 519
 520 #ifdef __WXDEBUG__
 521         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 522                    format.GetId().c_str());
 523 #endif // Debug
 524
 525         if (m_dataObject->IsSupportedFormat( format ))
 526             return formatAtom;
 527
 528         child = child->next;
 529     }
 530
 531     return (GdkAtom) 0;
 532 }
 533
 534 bool wxDropTarget::GetData()
 535 {
 536     if (!m_dragData)
 537         return false;
 538
 539     if (!m_dataObject)
 540         return false;
 541
 542     wxDataFormat dragFormat( m_dragData->target );
 543
 544     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 545         return false;
 546
 547     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 548
 549     return true;
 550 }
 551
 552 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 553 {
 554     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 555
 556     gtk_drag_dest_unset( widget );
 557
 558     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 559                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 560
 561     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 562                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 563
 564     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 565                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 566
 567     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 568                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 569 }
 570
 571 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 572 {
 573     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 574
 575     /* gtk_drag_dest_set() determines what default behaviour we'd like
 576        GTK to supply. we don't want to specify out targets (=formats)
 577        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 578        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 579        "drag_motion" and "drag_drop" events. this makes it possible
 580        to allow dropping on only a small area. we should set
 581        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 582        highlighting if dragging over standard controls, but this
 583        seems to be broken without the other two. */
 584
 585     gtk_drag_dest_set( widget,
 586                        (GtkDestDefaults) 0,         /* no default behaviour */
 587                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 588                        0,                           /* number of targets = 0 */
 589                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 590
 591     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 592                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 593
 594     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 595                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 596
 597     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 598                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 599
 600     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 601                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 602 }
 603
 604 //----------------------------------------------------------------------------
 605 // "drag_data_get"
 606 //----------------------------------------------------------------------------
 607
 608 extern "C" {
 609 static void
 610 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 611                        GdkDragContext     *WXUNUSED(context),
 612                        GtkSelectionData   *selection_data,
 613                        guint               WXUNUSED(info),
 614                        guint               WXUNUSED(time),
 615                        wxDropSource       *drop_source )
 616 {
 617     if (g_isIdle) wxapp_install_idle_handler();
 618
 619     wxDataFormat format( selection_data->target );
 620
 621     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 622                format.GetId().c_str());
 623
 624     drop_source->m_retValue = wxDragCancel;
 625
 626     wxDataObject *data = drop_source->GetDataObject();
 627
 628     if (!data)
 629     {
 630         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 631         return;
 632     }
 633
 634     if (!data->IsSupportedFormat(format))
 635     {
 636         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 637         return;
 638     }
 639
 640     if (data->GetDataSize(format) == 0)
 641     {
 642         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 643         return;
 644     }
 645
 646     size_t size = data->GetDataSize(format);
 647
 648 //  printf( "data size: %d.\n", (int)data_size );
 649
 650     guchar *d = new guchar[size];
 651
 652     if (!data->GetDataHere( format, (void*)d ))
 653     {
 654         delete[] d;
 655         return;
 656     }
 657
 658 #if wxUSE_THREADS
 659     /* disable GUI threads */
 660 #endif
 661
 662     gtk_selection_data_set( selection_data,
 663                             selection_data->target,
 664                             8,   // 8-bit
 665                             d,
 666                             size );
 667
 668 #if wxUSE_THREADS
 669     /* enable GUI threads */
 670 #endif
 671
 672     delete[] d;
 673 }
 674 }
 675
 676 //----------------------------------------------------------------------------
 677 // "drag_data_delete"
 678 //----------------------------------------------------------------------------
 679
 680 extern "C" {
 681 static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
 682                                      GdkDragContext *context,
 683                                      wxDropSource *WXUNUSED(drop_source) )
 684 {
 685     if (g_isIdle)
 686         wxapp_install_idle_handler();
 687
 688     // printf( "Drag source: drag_data_delete\n" );
 689 }
 690 }
 691
 692 //----------------------------------------------------------------------------
 693 // "drag_begin"
 694 //----------------------------------------------------------------------------
 695
 696 extern "C" {
 697 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 698                                GdkDragContext     *WXUNUSED(context),
 699                                wxDropSource       *WXUNUSED(drop_source) )
 700 {
 701     if (g_isIdle)
 702         wxapp_install_idle_handler();
 703
 704     // printf( "Drag source: drag_begin.\n" );
 705 }
 706 }
 707
 708 //----------------------------------------------------------------------------
 709 // "drag_end"
 710 //----------------------------------------------------------------------------
 711
 712 extern "C" {
 713 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 714                              GdkDragContext     *WXUNUSED(context),
 715                              wxDropSource       *drop_source )
 716 {
 717     if (g_isIdle) wxapp_install_idle_handler();
 718
 719     // printf( "Drag source: drag_end.\n" );
 720
 721     drop_source->m_waiting = false;
 722 }
 723 }
 724
 725 //-----------------------------------------------------------------------------
 726 // "configure_event" from m_iconWindow
 727 //-----------------------------------------------------------------------------
 728
 729 extern "C" {
 730 static gint
 731 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 732 {
 733     if (g_isIdle)
 734         wxapp_install_idle_handler();
 735
 736     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 737
 738     return 0;
 739 }
 740 }
 741
 742 //---------------------------------------------------------------------------
 743 // wxDropSource
 744 //---------------------------------------------------------------------------
 745
 746 wxDropSource::wxDropSource(wxWindow *win,
 747                            const wxIcon &iconCopy,
 748                            const wxIcon &iconMove,
 749                            const wxIcon &iconNone)
 750 {
 751     m_waiting = true;
 752
 753     m_iconWindow = (GtkWidget*) NULL;
 754
 755     m_window = win;
 756     m_widget = win->m_widget;
 757     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 758
 759     m_retValue = wxDragCancel;
 760
 761     SetIcons(iconCopy, iconMove, iconNone);
 762 }
 763
 764 wxDropSource::wxDropSource(wxDataObject& data,
 765                            wxWindow *win,
 766                            const wxIcon &iconCopy,
 767                            const wxIcon &iconMove,
 768                            const wxIcon &iconNone)
 769 {
 770     m_waiting = true;
 771
 772     SetData( data );
 773
 774     m_iconWindow = (GtkWidget*) NULL;
 775
 776     m_window = win;
 777     m_widget = win->m_widget;
 778     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 779
 780     m_retValue = wxDragCancel;
 781
 782     SetIcons(iconCopy, iconMove, iconNone);
 783 }
 784
 785 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 786                             const wxIcon &iconMove,
 787                             const wxIcon &iconNone)
 788 {
 789     m_iconCopy = iconCopy;
 790     m_iconMove = iconMove;
 791     m_iconNone = iconNone;
 792
 793     if ( !m_iconCopy.Ok() )
 794         m_iconCopy = wxIcon(page_xpm);
 795     if ( !m_iconMove.Ok() )
 796         m_iconMove = m_iconCopy;
 797     if ( !m_iconNone.Ok() )
 798         m_iconNone = m_iconCopy;
 799 }
 800
 801 wxDropSource::~wxDropSource()
 802 {
 803 }
 804
 805 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 806 {
 807     // get the right icon to display
 808     wxIcon *icon = NULL;
 809     if ( action & GDK_ACTION_MOVE )
 810         icon = &m_iconMove;
 811     else if ( action & GDK_ACTION_COPY )
 812         icon = &m_iconCopy;
 813     else
 814         icon = &m_iconNone;
 815
 816     GdkBitmap *mask;
 817     if ( icon->GetMask() )
 818         mask = icon->GetMask()->GetBitmap();
 819     else
 820         mask = (GdkBitmap *)NULL;
 821
 822     GdkPixmap *pixmap = icon->GetPixmap();
 823
 824     gint width,height;
 825     gdk_window_get_size (pixmap, &width, &height);
 826
 827     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 828     gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
 829     gtk_widget_push_colormap (colormap);
 830
 831     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 832     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 833     gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
 834
 835     gtk_widget_pop_visual ();
 836     gtk_widget_pop_colormap ();
 837
 838     gtk_widget_set_usize (m_iconWindow, width, height);
 839     gtk_widget_realize (m_iconWindow);
 840
 841     gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
 842         GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
 843
 844     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 845
 846     if (mask)
 847         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 848
 849     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 850 }
 851
 852 wxDragResult wxDropSource::DoDragDrop(int flags)
 853 {
 854     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 855                  wxT("Drop source: no data") );
 856
 857     // still in drag
 858     if (g_blockEventsOnDrag)
 859         return wxDragNone;
 860
 861     // don't start dragging if no button is down
 862     if (g_lastButtonNumber == 0)
 863         return wxDragNone;
 864
 865     // we can only start a drag after a mouse event
 866     if (g_lastMouseEvent == NULL)
 867         return wxDragNone;
 868
 869     // disabled for now
 870     g_blockEventsOnDrag = true;
 871
 872     RegisterWindow();
 873
 874     m_waiting = true;
 875
 876     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 877
 878     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 879     m_data->GetAllFormats( array );
 880     size_t count = m_data->GetFormatCount();
 881     for (size_t i = 0; i < count; i++)
 882     {
 883         GdkAtom atom = array[i];
 884         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 885         gtk_target_list_add( target_list, atom, 0, 0 );
 886     }
 887     delete[] array;
 888
 889         int action = GDK_ACTION_COPY;
 890         if ( flags & wxDrag_AllowMove )
 891             action |= GDK_ACTION_MOVE;
 892
 893         // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 894         //     to use a global to pass the flags to the drop target but I'd
 895         //     surely prefer a better way to do it
 896         gs_flagsForDrag = flags;
 897
 898         GdkDragContext *context = gtk_drag_begin( m_widget,
 899                 target_list,
 900                 (GdkDragAction)action,
 901                 g_lastButtonNumber,  // number of mouse button which started drag
 902                 (GdkEvent*) g_lastMouseEvent );
 903
 904         m_dragContext = context;
 905
 906         PrepareIcon( action, context );
 907
 908         while (m_waiting)
 909             gtk_main_iteration();
 910
 911         m_retValue = ConvertFromGTK(context->action);
 912         if ( m_retValue == wxDragNone )
 913             m_retValue = wxDragCancel;
 914
 915     g_blockEventsOnDrag = false;
 916
 917     UnregisterWindow();
 918
 919     return m_retValue;
 920 }
 921
 922 void wxDropSource::RegisterWindow()
 923 {
 924     if (!m_widget) return;
 925
 926     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 927                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 928     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 929                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 930     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 931                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 932     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 933                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 934
 935 }
 936
 937 void wxDropSource::UnregisterWindow()
 938 {
 939     if (!m_widget) return;
 940
 941     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 942                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 943     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 944                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 945     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 946                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 947     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 948                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 949 }
 950
 951 #endif
 952       // wxUSE_DRAG_AND_DROP