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