src/gtk1/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 * gv_xpm[] = {
  59 "40 34 3 1",
  60 "         s None c None",
  61 ".        c black",
  62 "X        c white",
  63 "                                        ",
  64 "                                        ",
  65 "                  ......                ",
  66 "                ..XXXXXX..              ",
  67 "               .XXXXXXXXXX.             ",
  68 "              .XXXXXXXXXXXX.            ",
  69 "              .XXXXXXXXXXXX.            ",
  70 "             .XXXXXXXXXXXXXX.           ",
  71 "             .XXX..XXXX..XXX.           ",
  72 "          ....XX....XX....XX.           ",
  73 "         .XXX.XXX..XXXX..XXX....        ",
  74 "        .XXXXXXXXXXXXXXXXXXX.XXX.       ",
  75 "        .XXXXXXXXXXXXXXXXXXXXXXXX.      ",
  76 "        .XXXXXXXXXXXXXXXXXXXXXXXX.      ",
  77 "         ..XXXXXXXXXXXXXXXXXXXXXX.      ",
  78 "           .XXXXXXXXXXXXXXXXXX...       ",
  79 "           ..XXXXXXXXXXXXXXXX.          ",
  80 "            .XXXXXXXXXXXXXXXX.          ",
  81 "            .XXXXXXXXXXXXXXXX.          ",
  82 "            .XXXXXXXXXXXXXXXXX.         ",
  83 "            .XXXXXXXXXXXXXXXXX.         ",
  84 "            .XXXXXXXXXXXXXXXXXX.        ",
  85 "            .XXXXXXXXXXXXXXXXXXX.       ",
  86 "           .XXXXXXXXXXXXXXXXXXXXX.      ",
  87 "           .XXXXXXXXXXXXXX.XXXXXXX.     ",
  88 "          .XXXXXXX.XXXXXXX.XXXXXXX.     ",
  89 "         .XXXXXXXX.XXXXXXX.XXXXXXX.     ",
  90 "         .XXXXXXX...XXXXX...XXXXX.      ",
  91 "         .XXXXXXX.  .....   .....       ",
  92 "         ..XXXX..                       ",
  93 "           ....                         ",
  94 "                                        ",
  95 "                                        ",
  96 "                                        "};
  97
  98 /* XPM */
  99 static char * page_xpm[] = {
 100 /* width height ncolors chars_per_pixel */
 101 "32 32 5 1",
 102 /* colors */
 103 "         s None        c None",
 104 ".        c black",
 105 "X        c wheat",
 106 "o        c tan",
 107 "O        c #6699FF",
 108 /* pixels */
 109 "    ...................         ",
 110 "    .XXXXXXXXXXXXXXXXX..        ",
 111 "    .XXXXXXXXXXXXXXXXX.o.       ",
 112 "    .XXXXXXXXXXXXXXXXX.oo.      ",
 113 "    .XXXXXXXXXXXXXXXXX.ooo.     ",
 114 "    .XXXXXXXXXXXXXXXXX.oooo.    ",
 115 "    .XXXXXXXXXXXXXXXXX.......   ",
 116 "    .XXXXXOOOOOOOOOOXXXooooo.   ",
 117 "    .XXXXXXXXXXXXXXXXXXooooo.   ",
 118 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 119 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 120 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
 121 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 122 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 123 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 124 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 125 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 126 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
 127 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 128 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 129 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 130 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 131 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 132 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 133 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 134 "    .XXXXXOOOOOOOXXXXXXXXXXX.   ",
 135 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 136 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 137 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 138 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 139 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 140 "    .........................   "};
 141
 142
 143
 144 // ----------------------------------------------------------------------------
 145 // "drag_leave"
 146 // ----------------------------------------------------------------------------
 147
 148 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 149                                GdkDragContext *context,
 150                                guint WXUNUSED(time),
 151                                wxDropTarget *drop_target )
 152 {
 153     if (g_isIdle) wxapp_install_idle_handler();
 154
 155     /* inform the wxDropTarget about the current GdkDragContext.
 156        this is only valid for the duration of this call */
 157     drop_target->SetDragContext( context );
 158
 159     /* we don't need return values. this event is just for
 160        information */
 161     drop_target->OnLeave();
 162
 163     /* this has to be done because GDK has no "drag_enter" event */
 164     drop_target->m_firstMotion = TRUE;
 165
 166     /* after this, invalidate the drop_target's GdkDragContext */
 167     drop_target->SetDragContext( (GdkDragContext*) NULL );
 168 }
 169
 170 // ----------------------------------------------------------------------------
 171 // "drag_motion"
 172 // ----------------------------------------------------------------------------
 173
 174 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 175                                     GdkDragContext *context,
 176                                     gint x,
 177                                     gint y,
 178                                     guint time,
 179                                     wxDropTarget *drop_target )
 180 {
 181     if (g_isIdle) wxapp_install_idle_handler();
 182
 183     /* Owen Taylor: "if the coordinates not in a drop zone,
 184        return FALSE, otherwise call gtk_drag_status() and
 185        return TRUE" */
 186
 187     /* inform the wxDropTarget about the current GdkDragContext.
 188        this is only valid for the duration of this call */
 189     drop_target->SetDragContext( context );
 190
 191     /* TODO: what should be the default behaviour? Copy or move? */
 192     wxDragResult result = wxDragMove;
 193
 194     if (drop_target->m_firstMotion)
 195     {
 196         /* the first "drag_motion" event substitutes a "drag_enter" event */
 197         result = drop_target->OnEnter( x, y, result );
 198     }
 199     else
 200     {
 201         /* give program a chance to react (i.e. to say no by returning FALSE) */
 202         result = drop_target->OnDragOver( x, y, result );
 203     }
 204
 205     /* we don't yet handle which "actions" (i.e. copy or move)
 206        the target accepts. so far we simply accept the
 207        suggested action. TODO. */
 208     bool ret = result != wxDragNone;
 209     if (ret)
 210         gdk_drag_status( context, context->suggested_action, time );
 211
 212     /* after this, invalidate the drop_target's GdkDragContext */
 213     drop_target->SetDragContext( (GdkDragContext*) NULL );
 214
 215     /* this has to be done because GDK has no "drag_enter" event */
 216     drop_target->m_firstMotion = FALSE;
 217
 218     return ret;
 219 }
 220
 221 // ----------------------------------------------------------------------------
 222 // "drag_drop"
 223 // ----------------------------------------------------------------------------
 224
 225 static gboolean target_drag_drop( GtkWidget *widget,
 226                                   GdkDragContext *context,
 227                                   gint x,
 228                                   gint y,
 229                                   guint time,
 230                                   wxDropTarget *drop_target )
 231 {
 232     if (g_isIdle) wxapp_install_idle_handler();
 233
 234     /* Owen Taylor: "if the drop is not in a drop zone,
 235        return FALSE, otherwise, if you aren't accepting
 236        the drop, call gtk_drag_finish() with success == FALSE
 237        otherwise call gtk_drag_data_get()" */
 238
 239 //    printf( "drop.\n" );
 240
 241     /* this seems to make a difference between not accepting
 242        due to wrong target area and due to wrong format. let
 243        us hope that this is not required.. */
 244
 245     /* inform the wxDropTarget about the current GdkDragContext.
 246        this is only valid for the duration of this call */
 247     drop_target->SetDragContext( context );
 248
 249     /* inform the wxDropTarget about the current drag widget.
 250        this is only valid for the duration of this call */
 251     drop_target->SetDragWidget( widget );
 252
 253     /* inform the wxDropTarget about the current drag time.
 254        this is only valid for the duration of this call */
 255     drop_target->SetDragTime( time );
 256
 257     bool ret = drop_target->OnDrop( x, y );
 258
 259     if (!ret)
 260     {
 261         wxLogDebug( wxT( "Drop target: OnDrop returned TRUE") );
 262
 263         /* cancel the whole thing */
 264         gtk_drag_finish( context,
 265                           FALSE,        /* no success */
 266                           FALSE,        /* don't delete data on dropping side */
 267                           time );
 268     }
 269     else
 270     {
 271         wxLogDebug( wxT( "Drop target: OnDrop returned TRUE") );
 272
 273 #if wxUSE_THREADS
 274         /* disable GUI threads */
 275         wxapp_uninstall_thread_wakeup();
 276 #endif
 277
 278         GdkAtom format = drop_target->GetMatchingPair();
 279         wxASSERT( format );
 280
 281         /* this should trigger an "drag_data_received" event */
 282         gtk_drag_get_data( widget,
 283                            context,
 284                            format,
 285                            time );
 286
 287 #if wxUSE_THREADS
 288         /* re-enable GUI threads */
 289         wxapp_install_thread_wakeup();
 290 #endif
 291     }
 292
 293     /* after this, invalidate the drop_target's GdkDragContext */
 294     drop_target->SetDragContext( (GdkDragContext*) NULL );
 295
 296     /* after this, invalidate the drop_target's drag widget */
 297     drop_target->SetDragWidget( (GtkWidget*) NULL );
 298
 299     /* this has to be done because GDK has no "drag_enter" event */
 300     drop_target->m_firstMotion = TRUE;
 301
 302     return ret;
 303 }
 304
 305 // ----------------------------------------------------------------------------
 306 // "drag_data_received"
 307 // ----------------------------------------------------------------------------
 308
 309 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 310                                        GdkDragContext *context,
 311                                        gint x,
 312                                        gint y,
 313                                        GtkSelectionData *data,
 314                                        guint WXUNUSED(info),
 315                                        guint time,
 316                                        wxDropTarget *drop_target )
 317 {
 318     if (g_isIdle) wxapp_install_idle_handler();
 319
 320     /* Owen Taylor: "call gtk_drag_finish() with
 321        success == TRUE" */
 322
 323
 324     if ((data->length <= 0) || (data->format != 8))
 325     {
 326         /* negative data length and non 8-bit data format
 327            qualifies for junk */
 328         gtk_drag_finish (context, FALSE, FALSE, time);
 329
 330         return;
 331     }
 332
 333     wxLogDebug( wxT( "Drop target: data received event") );
 334
 335     /* inform the wxDropTarget about the current GtkSelectionData.
 336        this is only valid for the duration of this call */
 337     drop_target->SetDragData( data );
 338
 339     if (drop_target->OnData( x, y ))
 340     {
 341         wxLogDebug( wxT( "Drop target: OnData returned TRUE") );
 342
 343         /* tell GTK that data transfer was successfull */
 344         gtk_drag_finish( context, TRUE, FALSE, time );
 345     }
 346     else
 347     {
 348         wxLogDebug( wxT( "Drop target: OnData returned FALSE") );
 349
 350         /* tell GTK that data transfer was not successfull */
 351         gtk_drag_finish( context, FALSE, FALSE, time );
 352     }
 353
 354     /* after this, invalidate the drop_target's drag data */
 355     drop_target->SetDragData( (GtkSelectionData*) NULL );
 356 }
 357
 358 //----------------------------------------------------------------------------
 359 // wxDropTarget
 360 //----------------------------------------------------------------------------
 361
 362 wxDropTarget::wxDropTarget( wxDataObject *data )
 363   : wxDropTargetBase( data )
 364 {
 365     m_firstMotion = TRUE;
 366     m_dragContext = (GdkDragContext*) NULL;
 367     m_dragWidget = (GtkWidget*) NULL;
 368     m_dragData = (GtkSelectionData*) NULL;
 369     m_dragTime = 0;
 370 }
 371
 372 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 373                                        wxCoord WXUNUSED(y),
 374                                        wxDragResult def )
 375 {
 376     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 377
 378     // disable the debug message from GetMatchingPair() - there are too many
 379     // of them otherwise
 380 #ifdef __WXDEBUG__
 381     wxLogNull noLog;
 382 #endif // Debug
 383
 384     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 385 }
 386
 387 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 388 {
 389     if (!m_dataObject)
 390         return FALSE;
 391
 392     return (GetMatchingPair() != (GdkAtom) 0);
 393 }
 394
 395 bool wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 396 {
 397     if (!m_dataObject)
 398         return FALSE;
 399
 400     if (GetMatchingPair() == (GdkAtom) 0)
 401         return FALSE;
 402
 403     return GetData();
 404 }
 405
 406 GdkAtom wxDropTarget::GetMatchingPair()
 407 {
 408     if (!m_dataObject)
 409         return (GdkAtom) 0;
 410
 411     if (!m_dragContext)
 412         return (GdkAtom) 0;
 413
 414     GList *child = m_dragContext->targets;
 415     while (child)
 416     {
 417         GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
 418         wxDataFormat format( formatAtom );
 419
 420 #ifdef __WXDEBUG__
 421         char *name = gdk_atom_name( formatAtom );
 422         wxLogDebug("Drop target: drag has format: %s", name ? name : "unnamed");
 423 #endif // Debug
 424
 425         if (m_dataObject->IsSupportedFormat( format ))
 426             return formatAtom;
 427
 428         child = child->next;
 429     }
 430
 431     return (GdkAtom) 0;
 432 }
 433
 434 bool wxDropTarget::GetData()
 435 {
 436     if (!m_dragData)
 437         return FALSE;
 438
 439     if (!m_dataObject)
 440         return FALSE;
 441
 442     wxDataFormat dragFormat( m_dragData->target );
 443
 444     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 445         return FALSE;
 446
 447     if (dragFormat.GetType() == wxDF_TEXT)
 448     {
 449         wxTextDataObject *text_object = (wxTextDataObject*)m_dataObject;
 450         text_object->SetText( (const char*)m_dragData->data );
 451         return TRUE;
 452     }
 453
 454     if (dragFormat.GetType() == wxDF_FILENAME)
 455     {
 456         wxFileDataObject *file_object = (wxFileDataObject*)m_dataObject;
 457         file_object->SetData( 0, (const char*)m_dragData->data );
 458         return TRUE;
 459     }
 460
 461     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 462
 463     return TRUE;
 464 }
 465
 466 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 467 {
 468     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 469
 470     gtk_drag_dest_unset( widget );
 471
 472     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 473                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 474
 475     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 476                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 477
 478     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 479                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 480
 481     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 482                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 483 }
 484
 485 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 486 {
 487     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 488
 489     /* gtk_drag_dest_set() determines what default behaviour we'd like
 490        GTK to supply. we don't want to specify out targets (=formats)
 491        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 492        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 493        "drag_motion" and "drag_drop" events. this makes it possible
 494        to allow dropping on only a small area. we should set
 495        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 496        highlighting if dragging over standard controls, but this
 497        seems to be broken without the other two. */
 498
 499     gtk_drag_dest_set( widget,
 500                        (GtkDestDefaults) 0,         /* no default behaviour */
 501                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 502                        0,                           /* number of targets = 0 */
 503                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 504
 505     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 506                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 507
 508     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 509                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 510
 511     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 512                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 513
 514     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 515                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 516 }
 517
 518 // ----------------------------------------------------------------------------
 519 // wxTextDropTarget
 520 // ----------------------------------------------------------------------------
 521
 522 wxTextDropTarget::wxTextDropTarget()
 523                 : wxDropTarget(new wxTextDataObject)
 524 {
 525 }
 526
 527 bool wxTextDropTarget::OnData(wxCoord x, wxCoord y)
 528 {
 529     if ( !GetData() )
 530         return FALSE;
 531
 532     return OnDropText(x, y, ((wxTextDataObject *)m_dataObject)->GetText());
 533 }
 534
 535 // ----------------------------------------------------------------------------
 536 // wxFileDropTarget
 537 // ----------------------------------------------------------------------------
 538
 539 wxFileDropTarget::wxFileDropTarget()
 540                 : wxDropTarget(new wxFileDataObject)
 541 {
 542 }
 543
 544 bool wxFileDropTarget::OnData(wxCoord x, wxCoord y)
 545 {
 546     if ( !GetData() )
 547         return FALSE;
 548
 549     return OnDropFiles(x, y,
 550                        ((wxFileDataObject *)m_dataObject)->GetFilenames());
 551 }
 552
 553 //----------------------------------------------------------------------------
 554 // "drag_data_get"
 555 //----------------------------------------------------------------------------
 556
 557 static void
 558 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 559                        GdkDragContext     *context,
 560                        GtkSelectionData   *selection_data,
 561                        guint               WXUNUSED(info),
 562                        guint               WXUNUSED(time),
 563                        wxDropSource       *drop_source )
 564 {
 565     if (g_isIdle) wxapp_install_idle_handler();
 566
 567     wxDataFormat format( selection_data->target );
 568
 569     wxLogDebug( wxT("Drop source: format requested: %s"), format.GetId().c_str() );
 570
 571     drop_source->m_retValue = wxDragCancel;
 572
 573     wxDataObject *data = drop_source->GetDataObject();
 574
 575     if (!data)
 576     {
 577         wxLogDebug( wxT("Drop source: no data object") );
 578         return;
 579     }
 580
 581     if (!data->IsSupportedFormat(format))
 582     {
 583         wxLogDebug( wxT("Drop source: unsupported format") );
 584         return;
 585     }
 586
 587     if (data->GetDataSize(format) == 0)
 588     {
 589         wxLogDebug( wxT("Drop source: empty data") );
 590         return;
 591     }
 592
 593     size_t size = data->GetDataSize(format);
 594
 595 //  printf( "data size: %d.\n", (int)data_size );
 596
 597     guchar *d = new guchar[size];
 598
 599     if (!data->GetDataHere( format, (void*)d ))
 600     {
 601         delete[] d;
 602         return;
 603     }
 604
 605 #if wxUSE_THREADS
 606     /* disable GUI threads */
 607     wxapp_uninstall_thread_wakeup();
 608 #endif
 609
 610                 gtk_selection_data_set( selection_data,
 611                                         selection_data->target,
 612                                         8,   // 8-bit
 613                                         d,
 614                                         size );
 615
 616 #if wxUSE_THREADS
 617     /* enable GUI threads */
 618     wxapp_install_thread_wakeup();
 619 #endif
 620
 621     delete[] d;
 622
 623     /* so far only copy, no moves. TODO. */
 624     drop_source->m_retValue = wxDragCopy;
 625 }
 626
 627 //----------------------------------------------------------------------------
 628 // "drag_data_delete"
 629 //----------------------------------------------------------------------------
 630
 631 static void source_drag_data_delete( GtkWidget          *WXUNUSED(widget),
 632                                      GdkDragContext     *WXUNUSED(context),
 633                                      wxDropSource       *drop_source )
 634 {
 635     if (g_isIdle) wxapp_install_idle_handler();
 636
 637 //  printf( "Delete the data!\n" );
 638
 639     drop_source->m_retValue = wxDragMove;
 640 }
 641
 642 //----------------------------------------------------------------------------
 643 // "drag_begin"
 644 //----------------------------------------------------------------------------
 645
 646 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 647                                GdkDragContext     *WXUNUSED(context),
 648                                wxDropSource       *WXUNUSED(drop_source) )
 649 {
 650     if (g_isIdle) wxapp_install_idle_handler();
 651
 652 //  printf( "drag_begin.\n" );
 653 }
 654
 655 //----------------------------------------------------------------------------
 656 // "drag_end"
 657 //----------------------------------------------------------------------------
 658
 659 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 660                              GdkDragContext     *WXUNUSED(context),
 661                              wxDropSource       *drop_source )
 662 {
 663     if (g_isIdle) wxapp_install_idle_handler();
 664
 665 //  printf( "drag_end.\n" );
 666
 667     drop_source->m_waiting = FALSE;
 668 }
 669
 670 //---------------------------------------------------------------------------
 671 // wxDropSource
 672 //---------------------------------------------------------------------------
 673
 674 wxDropSource::wxDropSource( wxWindow *win, const wxIcon &go, const wxIcon &stop )
 675 {
 676     g_blockEventsOnDrag = TRUE;
 677     m_waiting = TRUE;
 678
 679     m_window = win;
 680     m_widget = win->m_widget;
 681     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 682
 683     m_retValue = wxDragCancel;
 684
 685     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 686     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 687
 688     m_goIcon = go;
 689     if (wxNullIcon == go) m_goIcon = wxIcon( page_xpm );
 690     m_stopIcon = stop;
 691     if (wxNullIcon == stop) m_stopIcon = wxIcon( gv_xpm );
 692 }
 693
 694 wxDropSource::wxDropSource( wxDataObject& data, wxWindow *win,
 695                             const wxIcon &go, const wxIcon &stop )
 696 {
 697     m_waiting = TRUE;
 698
 699     SetData( data );
 700
 701     m_window = win;
 702     m_widget = win->m_widget;
 703     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 704     m_retValue = wxDragCancel;
 705
 706     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 707     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 708
 709     m_goIcon = go;
 710     if (wxNullIcon == go) m_goIcon = wxIcon( page_xpm );
 711     m_stopIcon = stop;
 712     if (wxNullIcon == stop) m_stopIcon = wxIcon( gv_xpm );
 713 }
 714
 715 wxDropSource::~wxDropSource()
 716 {
 717     g_blockEventsOnDrag = FALSE;
 718 }
 719
 720 wxDragResult wxDropSource::DoDragDrop( bool WXUNUSED(bAllowMove) )
 721 {
 722     wxASSERT_MSG( m_data, wxT("wxDragSource: no data") );
 723
 724     if (!m_data)
 725         return (wxDragResult) wxDragNone;
 726
 727     if (m_data->GetFormatCount() == 0)
 728         return (wxDragResult) wxDragNone;
 729
 730     g_blockEventsOnDrag = TRUE;
 731
 732     RegisterWindow();
 733
 734     m_waiting = TRUE;
 735
 736     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 737
 738     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 739     m_data->GetAllFormats( array );
 740     for (size_t i = 0; i < m_data->GetFormatCount(); i++)
 741     {
 742         GdkAtom atom = array[i];
 743         wxLogDebug( wxT("Supported atom %s"), gdk_atom_name( atom ) );
 744         gtk_target_list_add( target_list, atom, 0, 0 );
 745     }
 746     delete[] array;
 747
 748     GdkEventMotion event;
 749     event.window = m_widget->window;
 750     int x = 0;
 751     int y = 0;
 752     GdkModifierType state;
 753     gdk_window_get_pointer( event.window, &x, &y, &state );
 754     event.x = x;
 755     event.y = y;
 756     event.state = state;
 757     event.time = GDK_CURRENT_TIME;
 758
 759     /* GTK wants to know which button was pressed which caused the dragging */
 760     int button_number = 0;
 761     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 762     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 763     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 764
 765 #if wxUSE_THREADS
 766     /* disable GUI threads */
 767     wxapp_uninstall_thread_wakeup();
 768 #endif
 769
 770     /* don't start dragging if no button is down */
 771     if (button_number)
 772     {
 773         GdkDragContext *context = gtk_drag_begin( m_widget,
 774                                               target_list,
 775                                               GDK_ACTION_COPY,
 776                                               button_number,  /* number of mouse button which started drag */
 777                                               (GdkEvent*) &event );
 778
 779         wxMask *mask = m_goIcon.GetMask();
 780         GdkBitmap *bm = (GdkBitmap *) NULL;
 781         if (mask) bm = mask->GetBitmap();
 782         GdkPixmap *pm = m_goIcon.GetPixmap();
 783
 784         gtk_drag_set_icon_pixmap( context,
 785                                   gtk_widget_get_colormap( m_widget ),
 786                                   pm,
 787                                   bm,
 788                                   0,
 789                                   0 );
 790
 791         while (m_waiting) gtk_main_iteration();;
 792     }
 793
 794 #if wxUSE_THREADS
 795     /* re-enable GUI threads */
 796     wxapp_install_thread_wakeup();
 797 #endif
 798
 799     g_blockEventsOnDrag = FALSE;
 800
 801     UnregisterWindow();
 802
 803     return m_retValue;
 804 }
 805
 806 void wxDropSource::RegisterWindow()
 807 {
 808     if (!m_widget) return;
 809
 810     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 811                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 812     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 813                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 814     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 815                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 816     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 817                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 818
 819 }
 820
 821 void wxDropSource::UnregisterWindow()
 822 {
 823     if (!m_widget) return;
 824
 825     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 826                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 827     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 828                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 829     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 830                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 831     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 832                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 833 }
 834
 835 #endif
 836
 837       // wxUSE_DRAG_AND_DROP