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 const 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 if ( context->suggested_action == GDK_ACTION_LINK )
 159         result = wxDragLink;
 160     else
 161         result = wxDragMove;
 162
 163     if (drop_target->m_firstMotion)
 164     {
 165         /* the first "drag_motion" event substitutes a "drag_enter" event */
 166         result = drop_target->OnEnter( x, y, result );
 167     }
 168     else
 169     {
 170         /* give program a chance to react (i.e. to say no by returning FALSE) */
 171         result = drop_target->OnDragOver( x, y, result );
 172     }
 173
 174     bool ret = wxIsDragResultOk( result );
 175     if (ret)
 176     {
 177         GdkDragAction action;
 178         if (result == wxDragCopy)
 179             action = GDK_ACTION_COPY;
 180         else if (result == wxDragLink)
 181             action = GDK_ACTION_LINK;
 182         else
 183             action = GDK_ACTION_MOVE;
 184
 185         gdk_drag_status( context, action, time );
 186     }
 187
 188     /* after this, invalidate the drop_target's GdkDragContext */
 189     drop_target->SetDragContext( (GdkDragContext*) NULL );
 190
 191     /* this has to be done because GDK has no "drag_enter" event */
 192     drop_target->m_firstMotion = FALSE;
 193
 194     return ret;
 195 }
 196
 197 // ----------------------------------------------------------------------------
 198 // "drag_drop"
 199 // ----------------------------------------------------------------------------
 200
 201 static gboolean target_drag_drop( GtkWidget *widget,
 202                                   GdkDragContext *context,
 203                                   gint x,
 204                                   gint y,
 205                                   guint time,
 206                                   wxDropTarget *drop_target )
 207 {
 208     if (g_isIdle) wxapp_install_idle_handler();
 209
 210     /* Owen Taylor: "if the drop is not in a drop zone,
 211        return FALSE, otherwise, if you aren't accepting
 212        the drop, call gtk_drag_finish() with success == FALSE
 213        otherwise call gtk_drag_data_get()" */
 214
 215 //    printf( "drop.\n" );
 216
 217     /* this seems to make a difference between not accepting
 218        due to wrong target area and due to wrong format. let
 219        us hope that this is not required.. */
 220
 221     /* inform the wxDropTarget about the current GdkDragContext.
 222        this is only valid for the duration of this call */
 223     drop_target->SetDragContext( context );
 224
 225     /* inform the wxDropTarget about the current drag widget.
 226        this is only valid for the duration of this call */
 227     drop_target->SetDragWidget( widget );
 228
 229     /* inform the wxDropTarget about the current drag time.
 230        this is only valid for the duration of this call */
 231     drop_target->SetDragTime( time );
 232
 233 /*
 234     wxDragResult result = wxDragMove;
 235     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 236 */
 237
 238     /* reset the block here as someone might very well
 239        show a dialog as a reaction to a drop and this
 240        wouldn't work without events */
 241     g_blockEventsOnDrag = FALSE;
 242
 243     bool ret = drop_target->OnDrop( x, y );
 244
 245     if (!ret)
 246     {
 247         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 248
 249         /* cancel the whole thing */
 250         gtk_drag_finish( context,
 251                           FALSE,        /* no success */
 252                           FALSE,        /* don't delete data on dropping side */
 253                           time );
 254     }
 255     else
 256     {
 257         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned TRUE") );
 258
 259 #if wxUSE_THREADS
 260         /* disable GUI threads */
 261         wxapp_uninstall_thread_wakeup();
 262 #endif
 263
 264         GdkAtom format = drop_target->GetMatchingPair();
 265         wxASSERT( format );
 266
 267 /*
 268         GdkDragAction action = GDK_ACTION_MOVE;
 269         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 270         context->action = action;
 271 */
 272         /* this should trigger an "drag_data_received" event */
 273         gtk_drag_get_data( widget,
 274                            context,
 275                            format,
 276                            time );
 277
 278 #if wxUSE_THREADS
 279         /* re-enable GUI threads */
 280         wxapp_install_thread_wakeup();
 281 #endif
 282     }
 283
 284     /* after this, invalidate the drop_target's GdkDragContext */
 285     drop_target->SetDragContext( (GdkDragContext*) NULL );
 286
 287     /* after this, invalidate the drop_target's drag widget */
 288     drop_target->SetDragWidget( (GtkWidget*) NULL );
 289
 290     /* this has to be done because GDK has no "drag_enter" event */
 291     drop_target->m_firstMotion = TRUE;
 292
 293     return ret;
 294 }
 295
 296 // ----------------------------------------------------------------------------
 297 // "drag_data_received"
 298 // ----------------------------------------------------------------------------
 299
 300 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 301                                        GdkDragContext *context,
 302                                        gint x,
 303                                        gint y,
 304                                        GtkSelectionData *data,
 305                                        guint WXUNUSED(info),
 306                                        guint time,
 307                                        wxDropTarget *drop_target )
 308 {
 309     if (g_isIdle) wxapp_install_idle_handler();
 310
 311     /* Owen Taylor: "call gtk_drag_finish() with
 312        success == TRUE" */
 313
 314     if ((data->length <= 0) || (data->format != 8))
 315     {
 316         /* negative data length and non 8-bit data format
 317            qualifies for junk */
 318         gtk_drag_finish (context, FALSE, FALSE, time);
 319
 320         return;
 321     }
 322
 323     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 324
 325     /* inform the wxDropTarget about the current GtkSelectionData.
 326        this is only valid for the duration of this call */
 327     drop_target->SetDragData( data );
 328
 329     wxDragResult result;
 330     if ( context->suggested_action == GDK_ACTION_COPY )
 331         result = wxDragCopy;
 332     else if ( context->suggested_action == GDK_ACTION_LINK )
 333         result = wxDragLink;
 334     else
 335         result = wxDragMove;
 336
 337     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 338     {
 339         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned TRUE") );
 340
 341         /* tell GTK that data transfer was successfull */
 342         gtk_drag_finish( context, TRUE, FALSE, time );
 343     }
 344     else
 345     {
 346         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 347
 348         /* tell GTK that data transfer was not successfull */
 349         gtk_drag_finish( context, FALSE, FALSE, time );
 350     }
 351
 352     /* after this, invalidate the drop_target's drag data */
 353     drop_target->SetDragData( (GtkSelectionData*) NULL );
 354 }
 355
 356 //----------------------------------------------------------------------------
 357 // wxDropTarget
 358 //----------------------------------------------------------------------------
 359
 360 wxDropTarget::wxDropTarget( wxDataObject *data )
 361             : wxDropTargetBase( data )
 362 {
 363     m_firstMotion = TRUE;
 364     m_dragContext = (GdkDragContext*) NULL;
 365     m_dragWidget = (GtkWidget*) NULL;
 366     m_dragData = (GtkSelectionData*) NULL;
 367     m_dragTime = 0;
 368 }
 369
 370 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 371                                        wxCoord WXUNUSED(y),
 372                                        wxDragResult def )
 373 {
 374     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 375
 376     // disable the debug message from GetMatchingPair() - there are too many
 377     // of them otherwise
 378 #ifdef __WXDEBUG__
 379     wxLogNull noLog;
 380 #endif // Debug
 381
 382     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 383 }
 384
 385 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 386 {
 387     if (!m_dataObject)
 388         return FALSE;
 389
 390     return (GetMatchingPair() != (GdkAtom) 0);
 391 }
 392
 393 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 394                                    wxDragResult def )
 395 {
 396     if (!m_dataObject)
 397         return wxDragNone;
 398
 399     if (GetMatchingPair() == (GdkAtom) 0)
 400         return wxDragNone;
 401
 402     return GetData() ? def : wxDragNone;
 403 }
 404
 405 GdkAtom wxDropTarget::GetMatchingPair()
 406 {
 407     if (!m_dataObject)
 408         return (GdkAtom) 0;
 409
 410     if (!m_dragContext)
 411         return (GdkAtom) 0;
 412
 413     GList *child = m_dragContext->targets;
 414     while (child)
 415     {
 416         GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
 417         wxDataFormat format( formatAtom );
 418
 419 #ifdef __WXDEBUG__
 420         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 421                    format.GetId().c_str());
 422 #endif // Debug
 423
 424         if (m_dataObject->IsSupportedFormat( format ))
 425             return formatAtom;
 426
 427         child = child->next;
 428     }
 429
 430     return (GdkAtom) 0;
 431 }
 432
 433 bool wxDropTarget::GetData()
 434 {
 435     if (!m_dragData)
 436         return FALSE;
 437
 438     if (!m_dataObject)
 439         return FALSE;
 440
 441     wxDataFormat dragFormat( m_dragData->target );
 442
 443     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 444         return FALSE;
 445
 446     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 447
 448     return TRUE;
 449 }
 450
 451 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 452 {
 453     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 454
 455     gtk_drag_dest_unset( widget );
 456
 457     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 458                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 459
 460     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 461                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 462
 463     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 464                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 465
 466     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 467                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 468 }
 469
 470 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 471 {
 472     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 473
 474     /* gtk_drag_dest_set() determines what default behaviour we'd like
 475        GTK to supply. we don't want to specify out targets (=formats)
 476        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 477        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 478        "drag_motion" and "drag_drop" events. this makes it possible
 479        to allow dropping on only a small area. we should set
 480        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 481        highlighting if dragging over standard controls, but this
 482        seems to be broken without the other two. */
 483
 484     gtk_drag_dest_set( widget,
 485                        (GtkDestDefaults) 0,         /* no default behaviour */
 486                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 487                        0,                           /* number of targets = 0 */
 488                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 489
 490     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 491                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 492
 493     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 494                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 495
 496     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 497                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 498
 499     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 500                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 501 }
 502
 503 //----------------------------------------------------------------------------
 504 // "drag_data_get"
 505 //----------------------------------------------------------------------------
 506
 507 static void
 508 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 509                        GdkDragContext     *WXUNUSED(context),
 510                        GtkSelectionData   *selection_data,
 511                        guint               WXUNUSED(info),
 512                        guint               WXUNUSED(time),
 513                        wxDropSource       *drop_source )
 514 {
 515     if (g_isIdle) wxapp_install_idle_handler();
 516
 517     wxDataFormat format( selection_data->target );
 518
 519     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 520                format.GetId().c_str());
 521
 522     drop_source->m_retValue = wxDragCancel;
 523
 524     wxDataObject *data = drop_source->GetDataObject();
 525
 526     if (!data)
 527     {
 528         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 529         return;
 530     }
 531
 532     if (!data->IsSupportedFormat(format))
 533     {
 534         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 535         return;
 536     }
 537
 538     if (data->GetDataSize(format) == 0)
 539     {
 540         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 541         return;
 542     }
 543
 544     size_t size = data->GetDataSize(format);
 545
 546 //  printf( "data size: %d.\n", (int)data_size );
 547
 548     guchar *d = new guchar[size];
 549
 550     if (!data->GetDataHere( format, (void*)d ))
 551     {
 552         delete[] d;
 553         return;
 554     }
 555
 556 #if wxUSE_THREADS
 557     /* disable GUI threads */
 558     wxapp_uninstall_thread_wakeup();
 559 #endif
 560
 561                 gtk_selection_data_set( selection_data,
 562                                         selection_data->target,
 563                                         8,   // 8-bit
 564                                         d,
 565                                         size );
 566
 567 #if wxUSE_THREADS
 568     /* enable GUI threads */
 569     wxapp_install_thread_wakeup();
 570 #endif
 571
 572     delete[] d;
 573 }
 574
 575 //----------------------------------------------------------------------------
 576 // "drag_data_delete"
 577 //----------------------------------------------------------------------------
 578
 579 static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
 580                                      GdkDragContext *context,
 581                                      wxDropSource *WXUNUSED(drop_source) )
 582 {
 583     if (g_isIdle)
 584         wxapp_install_idle_handler();
 585
 586     // printf( "Drag source: drag_data_delete\n" );
 587 }
 588
 589 //----------------------------------------------------------------------------
 590 // "drag_begin"
 591 //----------------------------------------------------------------------------
 592
 593 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 594                                GdkDragContext     *WXUNUSED(context),
 595                                wxDropSource       *WXUNUSED(drop_source) )
 596 {
 597     if (g_isIdle)
 598         wxapp_install_idle_handler();
 599
 600     // printf( "Drag source: 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 source: 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_LINK) action = wxDragLink;
 631     if (source->m_dragContext->action == GDK_ACTION_MOVE) action = wxDragMove;
 632
 633     source->GiveFeedback( action );
 634
 635     return 0;
 636 }
 637
 638 //---------------------------------------------------------------------------
 639 // wxDropSource
 640 //---------------------------------------------------------------------------
 641
 642 wxDropSource::wxDropSource(wxWindow *win,
 643                            const wxIcon &iconCopy,
 644                            const wxIcon &iconMove,
 645                            const wxIcon &iconNone)
 646 {
 647     m_waiting = TRUE;
 648
 649     m_iconWindow = (GtkWidget*) NULL;
 650
 651     m_window = win;
 652     m_widget = win->m_widget;
 653     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 654
 655     m_retValue = wxDragCancel;
 656
 657     SetIcons(iconCopy, iconMove, iconNone);
 658 }
 659
 660 wxDropSource::wxDropSource(wxDataObject& data,
 661                            wxWindow *win,
 662                            const wxIcon &iconCopy,
 663                            const wxIcon &iconMove,
 664                            const wxIcon &iconNone)
 665 {
 666     m_waiting = TRUE;
 667
 668     SetData( data );
 669
 670     m_iconWindow = (GtkWidget*) NULL;
 671
 672     m_window = win;
 673     m_widget = win->m_widget;
 674     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 675
 676     m_retValue = wxDragCancel;
 677
 678     SetIcons(iconCopy, iconMove, iconNone);
 679 }
 680
 681 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 682                             const wxIcon &iconMove,
 683                             const wxIcon &iconNone)
 684 {
 685     m_iconCopy = iconCopy;
 686     m_iconMove = iconMove;
 687     m_iconNone = iconNone;
 688
 689     if ( !m_iconCopy.Ok() )
 690         m_iconCopy = wxIcon(page_xpm);
 691     if ( !m_iconMove.Ok() )
 692         m_iconMove = m_iconCopy;
 693     if ( !m_iconNone.Ok() )
 694         m_iconNone = m_iconCopy;
 695 }
 696
 697 wxDropSource::~wxDropSource()
 698 {
 699 }
 700
 701 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 702 {
 703     // get the right icon to display
 704     wxIcon *icon = NULL;
 705     if ( action & GDK_ACTION_MOVE )
 706         icon = &m_iconMove;
 707     else if ( action & GDK_ACTION_COPY )
 708         icon = &m_iconCopy;
 709     else
 710         icon = &m_iconNone;
 711
 712     GdkBitmap *mask;
 713     if ( icon->GetMask() )
 714         mask = icon->GetMask()->GetBitmap();
 715     else
 716         mask = (GdkBitmap *)NULL;
 717
 718     GdkPixmap *pixmap = icon->GetPixmap();
 719
 720     gint width,height;
 721     gdk_window_get_size (pixmap, &width, &height);
 722
 723     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 724 #ifndef __WXGTK20__
 725     gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
 726 #endif
 727     gtk_widget_push_colormap (colormap);
 728
 729     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 730     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 731     gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
 732
 733 #ifndef __WXGTK20__
 734     gtk_widget_pop_visual ();
 735 #endif
 736     gtk_widget_pop_colormap ();
 737
 738     gtk_widget_set_usize (m_iconWindow, width, height);
 739     gtk_widget_realize (m_iconWindow);
 740
 741     gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
 742         GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
 743
 744     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 745
 746     if (mask)
 747         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 748
 749     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 750 }
 751
 752 wxDragResult wxDropSource::DoDragDrop( bool allowMove )
 753 {
 754     wxASSERT_MSG( m_data, wxT("Drop source: no data") );
 755
 756     if (!m_data)
 757         return (wxDragResult) wxDragNone;
 758
 759     if (m_data->GetFormatCount() == 0)
 760         return (wxDragResult) wxDragNone;
 761
 762     // still in drag
 763     if (g_blockEventsOnDrag)
 764         return (wxDragResult) wxDragNone;
 765
 766     // disabled for now
 767     g_blockEventsOnDrag = TRUE;
 768
 769     RegisterWindow();
 770
 771     m_waiting = TRUE;
 772
 773     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 774
 775     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 776     m_data->GetAllFormats( array );
 777     for (size_t i = 0; i < m_data->GetFormatCount(); i++)
 778     {
 779         GdkAtom atom = array[i];
 780         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 781         gtk_target_list_add( target_list, atom, 0, 0 );
 782     }
 783     delete[] array;
 784
 785     GdkEventMotion event;
 786     event.window = m_widget->window;
 787     int x = 0;
 788     int y = 0;
 789     GdkModifierType state;
 790     gdk_window_get_pointer( event.window, &x, &y, &state );
 791     event.x = x;
 792     event.y = y;
 793     event.state = state;
 794     event.time = (guint32)GDK_CURRENT_TIME;
 795
 796     /* GTK wants to know which button was pressed which caused the dragging */
 797     int button_number = 0;
 798     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 799     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 800     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 801
 802 #if wxUSE_THREADS
 803     /* disable GUI threads */
 804     wxapp_uninstall_thread_wakeup();
 805 #endif
 806
 807     /* don't start dragging if no button is down */
 808     if (button_number)
 809     {
 810         int action = GDK_ACTION_COPY;
 811         if ( allowMove )
 812             action |= GDK_ACTION_MOVE;
 813         GdkDragContext *context = gtk_drag_begin( m_widget,
 814                 target_list,
 815                 (GdkDragAction)action,
 816                 button_number,  /* number of mouse button which started drag */
 817                 (GdkEvent*) &event );
 818
 819         m_dragContext = context;
 820
 821         PrepareIcon( action, context );
 822
 823         while (m_waiting) gtk_main_iteration();
 824
 825         if (context->action == GDK_ACTION_COPY)
 826             m_retValue = wxDragCopy;
 827         if (context->action == GDK_ACTION_LINK)
 828             m_retValue = wxDragLink;
 829         if (context->action == GDK_ACTION_MOVE)
 830             m_retValue = wxDragMove;
 831     }
 832
 833 #if wxUSE_THREADS
 834     /* re-enable GUI threads */
 835     wxapp_install_thread_wakeup();
 836 #endif
 837
 838     g_blockEventsOnDrag = FALSE;
 839
 840     UnregisterWindow();
 841
 842     return m_retValue;
 843 }
 844
 845 void wxDropSource::RegisterWindow()
 846 {
 847     if (!m_widget) return;
 848
 849     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 850                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 851     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 852                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 853     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 854                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 855     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 856                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 857
 858 }
 859
 860 void wxDropSource::UnregisterWindow()
 861 {
 862     if (!m_widget) return;
 863
 864     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 865                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 866     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 867                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 868     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 869                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 870     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 871                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 872 }
 873
 874 #endif
 875       // wxUSE_DRAG_AND_DROP