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