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 // global data
  33 //----------------------------------------------------------------------------
  34
  35 extern bool g_blockEventsOnDrag;
  36
  37 //----------------------------------------------------------------------------
  38 // standard icons
  39 //----------------------------------------------------------------------------
  40
  41 /* XPM */
  42 static char * gv_xpm[] = {
  43 "40 34 3 1",
  44 "       s None c None",
  45 ".      c black",
  46 "X      c white",
  47 "                                        ",
  48 "                                        ",
  49 "                  ......                ",
  50 "                ..XXXXXX..              ",
  51 "               .XXXXXXXXXX.             ",
  52 "              .XXXXXXXXXXXX.            ",
  53 "              .XXXXXXXXXXXX.            ",
  54 "             .XXXXXXXXXXXXXX.           ",
  55 "             .XXX..XXXX..XXX.           ",
  56 "          ....XX....XX....XX.           ",
  57 "         .XXX.XXX..XXXX..XXX....        ",
  58 "        .XXXXXXXXXXXXXXXXXXX.XXX.       ",
  59 "        .XXXXXXXXXXXXXXXXXXXXXXXX.      ",
  60 "        .XXXXXXXXXXXXXXXXXXXXXXXX.      ",
  61 "         ..XXXXXXXXXXXXXXXXXXXXXX.      ",
  62 "           .XXXXXXXXXXXXXXXXXX...       ",
  63 "           ..XXXXXXXXXXXXXXXX.          ",
  64 "            .XXXXXXXXXXXXXXXX.          ",
  65 "            .XXXXXXXXXXXXXXXX.          ",
  66 "            .XXXXXXXXXXXXXXXXX.         ",
  67 "            .XXXXXXXXXXXXXXXXX.         ",
  68 "            .XXXXXXXXXXXXXXXXXX.        ",
  69 "            .XXXXXXXXXXXXXXXXXXX.       ",
  70 "           .XXXXXXXXXXXXXXXXXXXXX.      ",
  71 "           .XXXXXXXXXXXXXX.XXXXXXX.     ",
  72 "          .XXXXXXX.XXXXXXX.XXXXXXX.     ",
  73 "         .XXXXXXXX.XXXXXXX.XXXXXXX.     ",
  74 "         .XXXXXXX...XXXXX...XXXXX.      ",
  75 "         .XXXXXXX.  .....   .....       ",
  76 "         ..XXXX..                       ",
  77 "           ....                         ",
  78 "                                        ",
  79 "                                        ",
  80 "                                        "};
  81
  82 /* XPM */
  83 static char * page_xpm[] = {
  84 /* width height ncolors chars_per_pixel */
  85 "32 32 5 1",
  86 /* colors */
  87 "       s None  c None",
  88 ".      c black",
  89 "X      c wheat",
  90 "o      c tan",
  91 "O      c #6699FF",
  92 /* pixels */
  93 "    ...................         ",
  94 "    .XXXXXXXXXXXXXXXXX..        ",
  95 "    .XXXXXXXXXXXXXXXXX.o.       ",
  96 "    .XXXXXXXXXXXXXXXXX.oo.      ",
  97 "    .XXXXXXXXXXXXXXXXX.ooo.     ",
  98 "    .XXXXXXXXXXXXXXXXX.oooo.    ",
  99 "    .XXXXXXXXXXXXXXXXX.......   ",
 100 "    .XXXXXOOOOOOOOOOXXXooooo.   ",
 101 "    .XXXXXXXXXXXXXXXXXXooooo.   ",
 102 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 103 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 104 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
 105 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 106 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 107 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 108 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 109 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 110 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
 111 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 112 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 113 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 114 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 115 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 116 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 117 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 118 "    .XXXXXOOOOOOOXXXXXXXXXXX.   ",
 119 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 120 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 121 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 122 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 123 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 124 "    .........................   "};
 125
 126
 127
 128 // ----------------------------------------------------------------------------
 129 // "drag_leave"
 130 // ----------------------------------------------------------------------------
 131
 132 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 133                                GdkDragContext *context,
 134                                guint WXUNUSED(time),
 135                                wxDropTarget *drop_target )
 136 {
 137     /* inform the wxDropTarget about the current GdkDragContext.
 138        this is only valid for the duration of this call */
 139     drop_target->SetDragContext( context );
 140
 141     /* we don't need return values. this event is just for
 142        information */
 143     drop_target->OnLeave();
 144
 145     /* this has to be done because GDK has no "drag_enter" event */
 146     drop_target->m_firstMotion = TRUE;
 147
 148     /* after this, invalidate the drop_target's GdkDragContext */
 149     drop_target->SetDragContext( (GdkDragContext*) NULL );
 150 }
 151
 152 // ----------------------------------------------------------------------------
 153 // "drag_motion"
 154 // ----------------------------------------------------------------------------
 155
 156 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 157                                     GdkDragContext *context,
 158                                     gint x,
 159                                     gint y,
 160                                     guint time,
 161                                     wxDropTarget *drop_target )
 162 {
 163     /* Owen Taylor: "if the coordinates not in a drop zone,
 164        return FALSE, otherwise call gtk_drag_status() and
 165        return TRUE" */
 166
 167     /* inform the wxDropTarget about the current GdkDragContext.
 168        this is only valid for the duration of this call */
 169     drop_target->SetDragContext( context );
 170
 171     if (drop_target->m_firstMotion)
 172     {
 173         /* the first "drag_motion" event substitutes a "drag_enter" event */
 174         drop_target->OnEnter();
 175     }
 176
 177     /* give program a chance to react (i.e. to say no by returning FALSE) */
 178     bool ret = drop_target->OnMove( x, y );
 179
 180     /* we don't yet handle which "actions" (i.e. copy or move)
 181        the target accepts. so far we simply accept the
 182        suggested action. TODO. */
 183     if (ret)
 184         gdk_drag_status( context, context->suggested_action, time );
 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     /* Owen Taylor: "if the drop is not in a drop zone,
 207        return FALSE, otherwise, if you aren't accepting
 208        the drop, call gtk_drag_finish() with success == FALSE
 209        otherwise call gtk_drag_data_get()" */
 210
 211 //    printf( "drop.\n" );
 212
 213     /* this seems to make a difference between not accepting
 214        due to wrong target area and due to wrong format. let
 215        us hope that this is not required.. */
 216
 217     /* inform the wxDropTarget about the current GdkDragContext.
 218        this is only valid for the duration of this call */
 219     drop_target->SetDragContext( context );
 220
 221     /* inform the wxDropTarget about the current drag widget.
 222        this is only valid for the duration of this call */
 223     drop_target->SetDragWidget( widget );
 224
 225     /* inform the wxDropTarget about the current drag time.
 226        this is only valid for the duration of this call */
 227     drop_target->SetDragTime( time );
 228
 229     bool ret = drop_target->OnDrop( x, y );
 230
 231     if (!ret)
 232     {
 233         /* cancel the whole thing */
 234         gtk_drag_finish( context,
 235                           FALSE,        /* no success */
 236                           FALSE,        /* don't delete data on dropping side */
 237                           time );
 238     }
 239
 240     /* after this, invalidate the drop_target's GdkDragContext */
 241     drop_target->SetDragContext( (GdkDragContext*) NULL );
 242
 243     /* after this, invalidate the drop_target's drag widget */
 244     drop_target->SetDragWidget( (GtkWidget*) NULL );
 245
 246     /* this has to be done because GDK has no "drag_enter" event */
 247     drop_target->m_firstMotion = TRUE;
 248
 249     return ret;
 250 }
 251
 252 // ----------------------------------------------------------------------------
 253 // "drag_data_received"
 254 // ----------------------------------------------------------------------------
 255
 256 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 257                                        GdkDragContext *context,
 258                                        gint x,
 259                                        gint y,
 260                                        GtkSelectionData *data,
 261                                        guint WXUNUSED(info),
 262                                        guint time,
 263                                        wxDropTarget *drop_target )
 264 {
 265     /* Owen Taylor: "call gtk_drag_finish() with
 266        success == TRUE" */
 267
 268 //    printf( "data received.\n" );
 269
 270     if ((data->length <= 0) || (data->format != 8))
 271     {
 272         /* negative data length and non 8-bit data format
 273            qualifies for junk */
 274         gtk_drag_finish (context, FALSE, FALSE, time);
 275
 276         return;
 277     }
 278
 279     /* inform the wxDropTarget about the current GtkSelectionData.
 280        this is only valid for the duration of this call */
 281     drop_target->SetDragData( data );
 282
 283     if (drop_target->OnData( x, y ))
 284     {
 285         /* tell GTK that data transfer was successfull */
 286         gtk_drag_finish( context, TRUE, FALSE, time );
 287     }
 288     else
 289     {
 290         /* tell GTK that data transfer was not successfull */
 291         gtk_drag_finish( context, FALSE, FALSE, time );
 292     }
 293
 294     /* after this, invalidate the drop_target's drag data */
 295     drop_target->SetDragData( (GtkSelectionData*) NULL );
 296 }
 297
 298 //----------------------------------------------------------------------------
 299 // wxDropTarget
 300 //----------------------------------------------------------------------------
 301
 302 wxDropTarget::wxDropTarget()
 303 {
 304     m_firstMotion = TRUE;
 305     m_dragContext = (GdkDragContext*) NULL;
 306     m_dragWidget = (GtkWidget*) NULL;
 307     m_dragData = (GtkSelectionData*) NULL;
 308     m_dragTime = 0;
 309 }
 310
 311 wxDropTarget::~wxDropTarget()
 312 {
 313 }
 314
 315 void wxDropTarget::OnEnter()
 316 {
 317 }
 318
 319 void wxDropTarget::OnLeave()
 320 {
 321 }
 322
 323 bool wxDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) )
 324 {
 325     return TRUE;
 326 }
 327
 328 bool wxDropTarget::OnDrop( int WXUNUSED(x), int WXUNUSED(y) )
 329 {
 330     return FALSE;
 331 }
 332
 333 bool wxDropTarget::OnData( int WXUNUSED(x), int WXUNUSED(y) )
 334 {
 335     return FALSE;
 336 }
 337
 338 bool wxDropTarget::RequestData( wxDataFormat format )
 339 {
 340     if (!m_dragContext) return FALSE;
 341     if (!m_dragWidget) return FALSE;
 342
 343     /* this should trigger an "drag_data_received" event */
 344     gtk_drag_get_data( m_dragWidget,
 345                        m_dragContext,
 346                        format.GetAtom(),
 347                        m_dragTime );
 348
 349     return TRUE;
 350 }
 351
 352 bool wxDropTarget::IsSupported( wxDataFormat format )
 353 {
 354     if (!m_dragContext) return FALSE;
 355
 356     GList *child = m_dragContext->targets;
 357     while (child)
 358     {
 359         GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
 360
 361 //        char *name = gdk_atom_name( formatAtom );
 362 //        if (name) printf( "Format available: %s.\n", name );
 363
 364         if (formatAtom == format.GetAtom()) return TRUE;
 365         child = child->next;
 366     }
 367
 368     return FALSE;
 369 }
 370
 371 bool wxDropTarget::GetData( wxDataObject *data_object )
 372 {
 373     if (!m_dragData) return FALSE;
 374
 375     if (m_dragData->target !=  data_object->GetFormat().GetAtom()) return FALSE;
 376
 377     if (data_object->GetFormat().GetType() == wxDF_TEXT)
 378     {
 379         wxTextDataObject *text_object = (wxTextDataObject*)data_object;
 380         text_object->SetText( (const char*)m_dragData->data );
 381     } else
 382
 383     if (data_object->GetFormat().GetType() == wxDF_FILENAME)
 384     {
 385     } else
 386
 387     if (data_object->GetFormat().GetType() == wxDF_PRIVATE)
 388     {
 389         wxPrivateDataObject *priv_object = (wxPrivateDataObject*)data_object;
 390         priv_object->SetData( (const char*)m_dragData->data, (size_t)m_dragData->length );
 391     }
 392
 393     return TRUE;
 394 }
 395
 396 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 397 {
 398     wxCHECK_RET( widget != NULL, _T("unregister widget is NULL") );
 399
 400     gtk_drag_dest_unset( widget );
 401
 402     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 403                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 404
 405     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 406                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 407
 408     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 409                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 410
 411     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 412                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 413 }
 414
 415 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 416 {
 417     wxCHECK_RET( widget != NULL, _T("register widget is NULL") );
 418
 419     /* gtk_drag_dest_set() determines what default behaviour we'd like
 420        GTK to supply. we don't want to specify out targets (=formats)
 421        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 422        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 423        "drag_motion" and "drag_drop" events. this makes it possible
 424        to allow dropping on only a small area. we should set
 425        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 426        highlighting if dragging over standard controls, but this
 427        seems to be broken without the other two. */
 428
 429     gtk_drag_dest_set( widget,
 430                        (GtkDestDefaults) 0,         /* no default behaviour */
 431                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 432                        0,                           /* number of targets = 0 */
 433                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 434
 435     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 436                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 437
 438     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 439                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 440
 441     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 442                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 443
 444     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 445                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 446 }
 447
 448 //-------------------------------------------------------------------------
 449 // wxTextDropTarget
 450 //-------------------------------------------------------------------------
 451
 452 bool wxTextDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) )
 453 {
 454     return IsSupported( wxDF_TEXT );
 455 }
 456
 457 bool wxTextDropTarget::OnDrop( int WXUNUSED(x), int WXUNUSED(y) )
 458 {
 459     if (IsSupported( wxDF_TEXT ))
 460     {
 461         RequestData( wxDF_TEXT );
 462         return TRUE;
 463     }
 464
 465     return FALSE;
 466 }
 467
 468 bool wxTextDropTarget::OnData( int x, int y )
 469 {
 470     wxTextDataObject data;
 471     if (!GetData( &data )) return FALSE;
 472
 473     OnDropText( x, y, data.GetText().mbc_str() );
 474
 475     return TRUE;
 476 }
 477
 478 //-------------------------------------------------------------------------
 479 // wxPrivateDropTarget
 480 //-------------------------------------------------------------------------
 481
 482 wxPrivateDropTarget::wxPrivateDropTarget()
 483 {
 484     m_id = wxTheApp->GetAppName();
 485 }
 486
 487 wxPrivateDropTarget::wxPrivateDropTarget( const wxString &id )
 488 {
 489     m_id = id;
 490 }
 491
 492 bool wxPrivateDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) )
 493 {
 494     return IsSupported( m_id );
 495 }
 496
 497 bool wxPrivateDropTarget::OnDrop( int WXUNUSED(x), int WXUNUSED(y) )
 498 {
 499     if (!IsSupported( m_id ))
 500     {
 501         RequestData( m_id );
 502         return FALSE;
 503     }
 504
 505     return FALSE;
 506 }
 507
 508 bool wxPrivateDropTarget::OnData( int x, int y )
 509 {
 510     if (!IsSupported( m_id )) return FALSE;
 511
 512     wxPrivateDataObject data;
 513     if (!GetData( &data )) return FALSE;
 514
 515     OnDropData( x, y, data.GetData(), data.GetSize() );
 516
 517     return TRUE;
 518 }
 519
 520 //----------------------------------------------------------------------------
 521 // A drop target which accepts files (dragged from File Manager or Explorer)
 522 //----------------------------------------------------------------------------
 523
 524 bool wxFileDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) )
 525 {
 526     return IsSupported( wxDF_FILENAME );
 527 }
 528
 529 bool wxFileDropTarget::OnDrop( int x, int y )
 530 {
 531     if (IsSupported( wxDF_FILENAME ))
 532     {
 533         RequestData( wxDF_FILENAME );
 534         return TRUE;
 535     }
 536
 537     return FALSE;
 538 }
 539
 540 bool wxFileDropTarget::OnData( int x, int y )
 541 {
 542     wxFileDataObject data;
 543     if (!GetData( &data )) return FALSE;
 544
 545     /* get number of substrings /root/mytext.txt/0/root/myothertext.txt/0/0 */
 546     size_t number = 0;
 547     size_t i;
 548     size_t size = data.GetFiles().Length();
 549     wxChar *text = WXSTRINGCAST data.GetFiles();
 550     for ( i = 0; i < size; i++)
 551         if (text[i] == 0) number++;
 552
 553     if (number == 0) return FALSE;
 554
 555     wxChar **files = new wxChar*[number];
 556
 557     text = WXSTRINGCAST data.GetFiles();
 558     for (i = 0; i < number; i++)
 559     {
 560         files[i] = text;
 561         int len = wxStrlen( text );
 562         text += len+1;
 563     }
 564
 565     OnDropFiles( x, y, number, files );
 566
 567     free( files );
 568
 569     return TRUE;
 570 }
 571
 572 //----------------------------------------------------------------------------
 573 // "drag_data_get"
 574 //----------------------------------------------------------------------------
 575
 576 static void
 577 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 578                        GdkDragContext     *context,
 579                        GtkSelectionData   *selection_data,
 580                        guint               WXUNUSED(info),
 581                        guint               WXUNUSED(time),
 582                        wxDropSource       *drop_source )
 583 {
 584 //    char *name = gdk_atom_name( selection_data->target );
 585 //    if (name) printf( "Format requested: %s.\n", name );
 586
 587     wxNode *node = drop_source->m_data->m_dataObjects.First();
 588     while (node)
 589     {
 590         wxDataObject *data_object = (wxDataObject*) node->Data();
 591         if (data_object->GetFormat().GetAtom() == selection_data->target)
 592         {
 593             size_t data_size = data_object->GetSize();
 594             if (data_size > 0)
 595             {
 596                 guchar *buffer = new guchar[data_size];
 597                 data_object->WriteData( buffer );
 598
 599                 gtk_selection_data_set( selection_data,
 600                                         selection_data->target,
 601                                         8,   /* 8-bit */
 602                                         buffer,
 603                                         data_size );
 604
 605                 free( buffer );
 606
 607                 /* so far only copy, no moves. TODO. */
 608                 drop_source->m_retValue = wxDragCopy;
 609
 610                 return;
 611             }
 612         }
 613
 614         node = node->Next();
 615     }
 616
 617     drop_source->m_retValue = wxDragCancel;
 618 }
 619
 620 //----------------------------------------------------------------------------
 621 // "drag_data_delete"
 622 //----------------------------------------------------------------------------
 623
 624 static void source_drag_data_delete( GtkWidget          *WXUNUSED(widget),
 625                                      GdkDragContext     *WXUNUSED(context),
 626                                      wxDropSource       *drop_source )
 627 {
 628 //    printf( "Delete the data!\n" );
 629
 630     drop_source->m_retValue = wxDragMove;
 631 }
 632
 633 //----------------------------------------------------------------------------
 634 // "drag_begin"
 635 //----------------------------------------------------------------------------
 636
 637 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 638                                GdkDragContext     *WXUNUSED(context),
 639                                wxDropSource       *WXUNUSED(drop_source) )
 640 {
 641 //    printf( "drag_begin.\n" );
 642 }
 643
 644 //----------------------------------------------------------------------------
 645 // "drag_end"
 646 //----------------------------------------------------------------------------
 647
 648 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 649                              GdkDragContext     *WXUNUSED(context),
 650                              wxDropSource       *drop_source )
 651 {
 652 //    printf( "drag_end.\n" );
 653
 654     drop_source->m_waiting = FALSE;
 655 }
 656
 657 //---------------------------------------------------------------------------
 658 // wxDropSource
 659 //---------------------------------------------------------------------------
 660
 661 wxDropSource::wxDropSource( wxWindow *win, const wxIcon &go, const wxIcon &stop )
 662 {
 663     g_blockEventsOnDrag = TRUE;
 664     m_waiting = TRUE;
 665
 666     m_window = win;
 667     m_widget = win->m_widget;
 668     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 669
 670     m_data = (wxDataBroker*) NULL;
 671     m_retValue = wxDragCancel;
 672
 673     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 674     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 675
 676     m_goIcon = go;
 677     if (wxNullIcon == go) m_goIcon = wxIcon( page_xpm );
 678     m_stopIcon = stop;
 679     if (wxNullIcon == stop) m_stopIcon = wxIcon( gv_xpm );
 680 }
 681
 682 wxDropSource::wxDropSource( wxDataObject *data, wxWindow *win, const wxIcon &go, const wxIcon &stop )
 683 {
 684     m_waiting = TRUE;
 685
 686     m_window = win;
 687     m_widget = win->m_widget;
 688     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 689     m_retValue = wxDragCancel;
 690
 691     if (data)
 692     {
 693         m_data = new wxDataBroker();
 694         m_data->Add( data );
 695     }
 696     else
 697     {
 698         m_data = (wxDataBroker*) NULL;
 699     }
 700
 701     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 702     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 703
 704     m_goIcon = go;
 705     if (wxNullIcon == go) m_goIcon = wxIcon( page_xpm );
 706     m_stopIcon = stop;
 707     if (wxNullIcon == stop) m_stopIcon = wxIcon( gv_xpm );
 708 }
 709
 710 wxDropSource::wxDropSource( wxDataBroker *data, wxWindow *win )
 711 {
 712     m_window = win;
 713     m_widget = win->m_widget;
 714     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 715     m_retValue = wxDragCancel;
 716
 717     m_data = data;
 718
 719     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 720     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 721 }
 722
 723 void wxDropSource::SetData( wxDataObject *data )
 724 {
 725     if (m_data) delete m_data;
 726
 727     if (data)
 728     {
 729         m_data = new wxDataBroker();
 730         m_data->Add( data );
 731     }
 732     else
 733     {
 734         m_data = (wxDataBroker*) NULL;
 735     }
 736 }
 737
 738 void wxDropSource::SetData( wxDataBroker *data )
 739 {
 740     if (m_data) delete m_data;
 741
 742     m_data = data;
 743 }
 744
 745 wxDropSource::~wxDropSource(void)
 746 {
 747     if (m_data) delete m_data;
 748
 749     g_blockEventsOnDrag = FALSE;
 750 }
 751
 752 wxDragResult wxDropSource::DoDragDrop( bool WXUNUSED(bAllowMove) )
 753 {
 754     wxASSERT_MSG( m_data, _T("wxDragSource: no data") );
 755
 756     if (!m_data) return (wxDragResult) wxDragNone;
 757
 758     g_blockEventsOnDrag = TRUE;
 759
 760     RegisterWindow();
 761
 762     m_waiting = TRUE;
 763
 764     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 765     gtk_target_list_add( target_list, gdk_atom_intern( "STRING", FALSE ), 0, 0 );
 766
 767     GdkEventMotion event;
 768     event.window = m_widget->window;
 769     int x = 0;
 770     int y = 0;
 771     GdkModifierType state;
 772     gdk_window_get_pointer( event.window, &x, &y, &state );
 773     event.x = x;
 774     event.y = y;
 775     event.state = state;
 776
 777     /* GTK wants to know which button was pressed which caused the dragging */
 778     int button_number = 0;
 779     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 780     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 781     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 782
 783     /* don't start dragging if no button is down */
 784     if (button_number)
 785     {
 786         GdkDragContext *context = gtk_drag_begin( m_widget,
 787                                               target_list,
 788                                               GDK_ACTION_COPY,
 789                                               button_number,  /* number of mouse button which started drag */
 790                                               (GdkEvent*) &event );
 791
 792         wxMask *mask = m_goIcon.GetMask();
 793         GdkBitmap *bm = (GdkBitmap *) NULL;
 794         if (mask) bm = mask->GetBitmap();
 795         GdkPixmap *pm = m_goIcon.GetPixmap();
 796
 797         gtk_drag_set_icon_pixmap( context,
 798                                   gtk_widget_get_colormap( m_widget ),
 799                                   pm,
 800                                   bm,
 801                                   0,
 802                                   0 );
 803
 804         gdk_flush();
 805
 806         while (m_waiting) wxYield();
 807     }
 808
 809     g_blockEventsOnDrag = FALSE;
 810
 811     UnregisterWindow();
 812
 813     return m_retValue;
 814 }
 815
 816 void wxDropSource::RegisterWindow()
 817 {
 818     if (!m_widget) return;
 819
 820     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 821                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 822     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 823                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 824     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 825                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 826     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 827                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 828
 829 }
 830
 831 void wxDropSource::UnregisterWindow()
 832 {
 833     if (!m_widget) return;
 834
 835     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 836                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 837     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 838                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 839     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 840                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 841     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 842                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 843 }
 844
 845 #endif
 846
 847       // wxUSE_DRAG_AND_DROP