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