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 FALSE") );
 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 wxDragNone;
 382
 383     if (GetMatchingPair() == (GdkAtom) 0)
 384         return wxDragNone;
 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         wxLogDebug( wxT("Drop target: drag has format: %s"), format.GetId().c_str() );
 405 #endif // Debug
 406
 407         if (m_dataObject->IsSupportedFormat( format ))
 408             return formatAtom;
 409
 410         child = child->next;
 411     }
 412
 413     return (GdkAtom) 0;
 414 }
 415
 416 bool wxDropTarget::GetData()
 417 {
 418     if (!m_dragData)
 419         return FALSE;
 420
 421     if (!m_dataObject)
 422         return FALSE;
 423
 424     wxDataFormat dragFormat( m_dragData->target );
 425
 426     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 427         return FALSE;
 428
 429     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 430
 431     return TRUE;
 432 }
 433
 434 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 435 {
 436     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 437
 438     gtk_drag_dest_unset( widget );
 439
 440     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 441                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 442
 443     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 444                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 445
 446     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 447                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 448
 449     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 450                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 451 }
 452
 453 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 454 {
 455     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 456
 457     /* gtk_drag_dest_set() determines what default behaviour we'd like
 458        GTK to supply. we don't want to specify out targets (=formats)
 459        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 460        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 461        "drag_motion" and "drag_drop" events. this makes it possible
 462        to allow dropping on only a small area. we should set
 463        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 464        highlighting if dragging over standard controls, but this
 465        seems to be broken without the other two. */
 466
 467     gtk_drag_dest_set( widget,
 468                        (GtkDestDefaults) 0,         /* no default behaviour */
 469                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 470                        0,                           /* number of targets = 0 */
 471                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 472
 473     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 474                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 475
 476     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 477                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 478
 479     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 480                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 481
 482     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 483                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 484 }
 485
 486 //----------------------------------------------------------------------------
 487 // "drag_data_get"
 488 //----------------------------------------------------------------------------
 489
 490 static void
 491 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 492                        GdkDragContext     *WXUNUSED(context),
 493                        GtkSelectionData   *selection_data,
 494                        guint               WXUNUSED(info),
 495                        guint               WXUNUSED(time),
 496                        wxDropSource       *drop_source )
 497 {
 498     if (g_isIdle) wxapp_install_idle_handler();
 499
 500     wxDataFormat format( selection_data->target );
 501
 502     wxLogDebug( wxT("Drop source: format requested: %s"), format.GetId().c_str() );
 503
 504     drop_source->m_retValue = wxDragCancel;
 505
 506     wxDataObject *data = drop_source->GetDataObject();
 507
 508     if (!data)
 509     {
 510         wxLogDebug( wxT("Drop source: no data object") );
 511         return;
 512     }
 513
 514     if (!data->IsSupportedFormat(format))
 515     {
 516         wxLogDebug( wxT("Drop source: unsupported format") );
 517         return;
 518     }
 519
 520     if (data->GetDataSize(format) == 0)
 521     {
 522         wxLogDebug( wxT("Drop source: empty data") );
 523         return;
 524     }
 525
 526     size_t size = data->GetDataSize(format);
 527
 528 //  printf( "data size: %d.\n", (int)data_size );
 529
 530     guchar *d = new guchar[size];
 531
 532     if (!data->GetDataHere( format, (void*)d ))
 533     {
 534         delete[] d;
 535         return;
 536     }
 537
 538 #if wxUSE_THREADS
 539     /* disable GUI threads */
 540     wxapp_uninstall_thread_wakeup();
 541 #endif
 542
 543                 gtk_selection_data_set( selection_data,
 544                                         selection_data->target,
 545                                         8,   // 8-bit
 546                                         d,
 547                                         size );
 548
 549 #if wxUSE_THREADS
 550     /* enable GUI threads */
 551     wxapp_install_thread_wakeup();
 552 #endif
 553
 554     delete[] d;
 555 }
 556
 557 //----------------------------------------------------------------------------
 558 // "drag_data_delete"
 559 //----------------------------------------------------------------------------
 560
 561 static void source_drag_data_delete( GtkWidget          *WXUNUSED(widget),
 562                                      GdkDragContext     *WXUNUSED(context),
 563                                      wxDropSource       *WXUNUSED(drop_source) )
 564 {
 565     if (g_isIdle)
 566         wxapp_install_idle_handler();
 567
 568     // printf( "Drag source: drag_data_delete\n" );
 569 }
 570
 571 //----------------------------------------------------------------------------
 572 // "drag_begin"
 573 //----------------------------------------------------------------------------
 574
 575 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 576                                GdkDragContext     *WXUNUSED(context),
 577                                wxDropSource       *WXUNUSED(drop_source) )
 578 {
 579     if (g_isIdle)
 580         wxapp_install_idle_handler();
 581
 582     // printf( "Drag source: drag_begin.\n" );
 583 }
 584
 585 //----------------------------------------------------------------------------
 586 // "drag_end"
 587 //----------------------------------------------------------------------------
 588
 589 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 590                              GdkDragContext     *WXUNUSED(context),
 591                              wxDropSource       *drop_source )
 592 {
 593     if (g_isIdle) wxapp_install_idle_handler();
 594
 595     // printf( "Drag source: drag_end.\n" );
 596
 597     drop_source->m_waiting = FALSE;
 598 }
 599
 600 //-----------------------------------------------------------------------------
 601 // "configure_event" from m_iconWindow
 602 //-----------------------------------------------------------------------------
 603
 604 static gint
 605 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 606 {
 607     if (g_isIdle)
 608         wxapp_install_idle_handler();
 609
 610     wxDragResult action = wxDragNone;
 611     if (source->m_dragContext->action == GDK_ACTION_COPY) action = wxDragCopy;
 612     if (source->m_dragContext->action == GDK_ACTION_MOVE) action = wxDragMove;
 613
 614     source->GiveFeedback( action );
 615
 616     return 0;
 617 }
 618
 619 //---------------------------------------------------------------------------
 620 // wxDropSource
 621 //---------------------------------------------------------------------------
 622
 623 wxDropSource::wxDropSource(wxWindow *win,
 624                            const wxIcon &iconCopy,
 625                            const wxIcon &iconMove,
 626                            const wxIcon &iconNone)
 627 {
 628     m_waiting = TRUE;
 629
 630     m_iconWindow = (GtkWidget*) NULL;
 631
 632     m_window = win;
 633     m_widget = win->m_widget;
 634     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 635
 636     m_retValue = wxDragCancel;
 637
 638     SetIcons(iconCopy, iconMove, iconNone);
 639 }
 640
 641 wxDropSource::wxDropSource(wxDataObject& data,
 642                            wxWindow *win,
 643                            const wxIcon &iconCopy,
 644                            const wxIcon &iconMove,
 645                            const wxIcon &iconNone)
 646 {
 647     m_waiting = TRUE;
 648
 649     SetData( data );
 650
 651     m_iconWindow = (GtkWidget*) NULL;
 652
 653     m_window = win;
 654     m_widget = win->m_widget;
 655     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 656
 657     m_retValue = wxDragCancel;
 658
 659     SetIcons(iconCopy, iconMove, iconNone);
 660 }
 661
 662 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 663                             const wxIcon &iconMove,
 664                             const wxIcon &iconNone)
 665 {
 666     m_iconCopy = iconCopy;
 667     m_iconMove = iconMove;
 668     m_iconNone = iconNone;
 669
 670     if ( !m_iconCopy.Ok() )
 671         m_iconCopy = wxIcon(page_xpm);
 672     if ( !m_iconMove.Ok() )
 673         m_iconMove = m_iconCopy;
 674     if ( !m_iconNone.Ok() )
 675         m_iconNone = m_iconCopy;
 676 }
 677
 678 wxDropSource::~wxDropSource()
 679 {
 680 }
 681
 682 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 683 {
 684     // get the right icon to display
 685     wxIcon *icon = NULL;
 686     if ( action & GDK_ACTION_MOVE )
 687         icon = &m_iconMove;
 688     else if ( action & GDK_ACTION_COPY )
 689         icon = &m_iconCopy;
 690     else
 691         icon = &m_iconNone;
 692
 693     GdkBitmap *mask;
 694     if ( icon->GetMask() )
 695         mask = icon->GetMask()->GetBitmap();
 696     else
 697         mask = (GdkBitmap *)NULL;
 698
 699     GdkPixmap *pixmap = icon->GetPixmap();
 700
 701     gint width,height;
 702     gdk_window_get_size (pixmap, &width, &height);
 703
 704     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 705     gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
 706     gtk_widget_push_colormap (colormap);
 707
 708     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 709     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 710     gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
 711
 712     gtk_widget_pop_visual ();
 713     gtk_widget_pop_colormap ();
 714
 715     gtk_widget_set_usize (m_iconWindow, width, height);
 716     gtk_widget_realize (m_iconWindow);
 717
 718     gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
 719         GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
 720
 721     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 722
 723     if (mask)
 724         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 725
 726     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 727 }
 728
 729 wxDragResult wxDropSource::DoDragDrop( bool allowMove )
 730 {
 731     wxASSERT_MSG( m_data, wxT("Drop source: no data") );
 732
 733     if (!m_data)
 734         return (wxDragResult) wxDragNone;
 735
 736     if (m_data->GetFormatCount() == 0)
 737         return (wxDragResult) wxDragNone;
 738
 739     // disabled for now
 740     g_blockEventsOnDrag = FALSE;
 741
 742     RegisterWindow();
 743
 744     m_waiting = TRUE;
 745
 746     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 747
 748     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 749     m_data->GetAllFormats( array );
 750     for (size_t i = 0; i < m_data->GetFormatCount(); i++)
 751     {
 752         GdkAtom atom = array[i];
 753         wxLogDebug( wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ) );
 754         gtk_target_list_add( target_list, atom, 0, 0 );
 755     }
 756     delete[] array;
 757
 758     GdkEventMotion event;
 759     event.window = m_widget->window;
 760     int x = 0;
 761     int y = 0;
 762     GdkModifierType state;
 763     gdk_window_get_pointer( event.window, &x, &y, &state );
 764     event.x = x;
 765     event.y = y;
 766     event.state = state;
 767     event.time = (guint32)GDK_CURRENT_TIME;
 768
 769     /* GTK wants to know which button was pressed which caused the dragging */
 770     int button_number = 0;
 771     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 772     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 773     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 774
 775 #if wxUSE_THREADS
 776     /* disable GUI threads */
 777     wxapp_uninstall_thread_wakeup();
 778 #endif
 779
 780     /* don't start dragging if no button is down */
 781     if (button_number)
 782     {
 783         GdkDragAction action = GDK_ACTION_COPY;
 784         if (allowMove) action = (GdkDragAction)(GDK_ACTION_MOVE|GDK_ACTION_COPY);
 785         GdkDragContext *context = gtk_drag_begin( m_widget,
 786                 target_list,
 787                 action,
 788                 button_number,  /* number of mouse button which started drag */
 789                 (GdkEvent*) &event );
 790
 791         m_dragContext = context;
 792
 793         PrepareIcon( action, context );
 794
 795         while (m_waiting) gtk_main_iteration();
 796
 797         if (context->action == GDK_ACTION_COPY)
 798             m_retValue = wxDragCopy;
 799         if (context->action == GDK_ACTION_MOVE)
 800             m_retValue = wxDragMove;
 801     }
 802
 803 #if wxUSE_THREADS
 804     /* re-enable GUI threads */
 805     wxapp_install_thread_wakeup();
 806 #endif
 807
 808     g_blockEventsOnDrag = FALSE;
 809
 810     UnregisterWindow();
 811
 812     return m_retValue;
 813 }
 814
 815 void wxDropSource::RegisterWindow()
 816 {
 817     if (!m_widget) return;
 818
 819     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 820                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 821     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 822                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 823     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 824                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 825     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 826                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 827
 828 }
 829
 830 void wxDropSource::UnregisterWindow()
 831 {
 832     if (!m_widget) return;
 833
 834     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 835                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 836     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 837                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 838     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 839                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 840     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 841                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 842 }
 843
 844 #endif
 845       // wxUSE_DRAG_AND_DROP