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 // global data
  40 //----------------------------------------------------------------------------
  41
  42 extern bool g_blockEventsOnDrag;
  43
  44 //----------------------------------------------------------------------------
  45 // standard icons
  46 //----------------------------------------------------------------------------
  47
  48 /* XPM */
  49 static char * gv_xpm[] = {
  50 "40 34 3 1",
  51 "         s None c None",
  52 ".        c black",
  53 "X        c white",
  54 "                                        ",
  55 "                                        ",
  56 "                  ......                ",
  57 "                ..XXXXXX..              ",
  58 "               .XXXXXXXXXX.             ",
  59 "              .XXXXXXXXXXXX.            ",
  60 "              .XXXXXXXXXXXX.            ",
  61 "             .XXXXXXXXXXXXXX.           ",
  62 "             .XXX..XXXX..XXX.           ",
  63 "          ....XX....XX....XX.           ",
  64 "         .XXX.XXX..XXXX..XXX....        ",
  65 "        .XXXXXXXXXXXXXXXXXXX.XXX.       ",
  66 "        .XXXXXXXXXXXXXXXXXXXXXXXX.      ",
  67 "        .XXXXXXXXXXXXXXXXXXXXXXXX.      ",
  68 "         ..XXXXXXXXXXXXXXXXXXXXXX.      ",
  69 "           .XXXXXXXXXXXXXXXXXX...       ",
  70 "           ..XXXXXXXXXXXXXXXX.          ",
  71 "            .XXXXXXXXXXXXXXXX.          ",
  72 "            .XXXXXXXXXXXXXXXX.          ",
  73 "            .XXXXXXXXXXXXXXXXX.         ",
  74 "            .XXXXXXXXXXXXXXXXX.         ",
  75 "            .XXXXXXXXXXXXXXXXXX.        ",
  76 "            .XXXXXXXXXXXXXXXXXXX.       ",
  77 "           .XXXXXXXXXXXXXXXXXXXXX.      ",
  78 "           .XXXXXXXXXXXXXX.XXXXXXX.     ",
  79 "          .XXXXXXX.XXXXXXX.XXXXXXX.     ",
  80 "         .XXXXXXXX.XXXXXXX.XXXXXXX.     ",
  81 "         .XXXXXXX...XXXXX...XXXXX.      ",
  82 "         .XXXXXXX.  .....   .....       ",
  83 "         ..XXXX..                       ",
  84 "           ....                         ",
  85 "                                        ",
  86 "                                        ",
  87 "                                        "};
  88
  89 /* XPM */
  90 static char * page_xpm[] = {
  91 /* width height ncolors chars_per_pixel */
  92 "32 32 5 1",
  93 /* colors */
  94 "         s None        c None",
  95 ".        c black",
  96 "X        c wheat",
  97 "o        c tan",
  98 "O        c #6699FF",
  99 /* pixels */
 100 "    ...................         ",
 101 "    .XXXXXXXXXXXXXXXXX..        ",
 102 "    .XXXXXXXXXXXXXXXXX.o.       ",
 103 "    .XXXXXXXXXXXXXXXXX.oo.      ",
 104 "    .XXXXXXXXXXXXXXXXX.ooo.     ",
 105 "    .XXXXXXXXXXXXXXXXX.oooo.    ",
 106 "    .XXXXXXXXXXXXXXXXX.......   ",
 107 "    .XXXXXOOOOOOOOOOXXXooooo.   ",
 108 "    .XXXXXXXXXXXXXXXXXXooooo.   ",
 109 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 110 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 111 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
 112 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 113 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 114 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 115 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 116 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 117 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
 118 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 119 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 120 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 121 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 122 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 123 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 124 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 125 "    .XXXXXOOOOOOOXXXXXXXXXXX.   ",
 126 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 127 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 128 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 129 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 130 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 131 "    .........................   "};
 132
 133
 134
 135 // ----------------------------------------------------------------------------
 136 // "drag_leave"
 137 // ----------------------------------------------------------------------------
 138
 139 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 140                                GdkDragContext *context,
 141                                guint WXUNUSED(time),
 142                                wxDropTarget *drop_target )
 143 {
 144     if (g_isIdle) wxapp_install_idle_handler();
 145
 146     /* inform the wxDropTarget about the current GdkDragContext.
 147        this is only valid for the duration of this call */
 148     drop_target->SetDragContext( context );
 149
 150     /* we don't need return values. this event is just for
 151        information */
 152     drop_target->OnLeave();
 153
 154     /* this has to be done because GDK has no "drag_enter" event */
 155     drop_target->m_firstMotion = TRUE;
 156
 157     /* after this, invalidate the drop_target's GdkDragContext */
 158     drop_target->SetDragContext( (GdkDragContext*) NULL );
 159 }
 160
 161 // ----------------------------------------------------------------------------
 162 // "drag_motion"
 163 // ----------------------------------------------------------------------------
 164
 165 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 166                                     GdkDragContext *context,
 167                                     gint x,
 168                                     gint y,
 169                                     guint time,
 170                                     wxDropTarget *drop_target )
 171 {
 172     if (g_isIdle) wxapp_install_idle_handler();
 173
 174     /* Owen Taylor: "if the coordinates not in a drop zone,
 175        return FALSE, otherwise call gtk_drag_status() and
 176        return TRUE" */
 177
 178     /* inform the wxDropTarget about the current GdkDragContext.
 179        this is only valid for the duration of this call */
 180     drop_target->SetDragContext( context );
 181
 182     if (drop_target->m_firstMotion)
 183     {
 184         /* the first "drag_motion" event substitutes a "drag_enter" event */
 185         drop_target->OnEnter();
 186     }
 187
 188     /* give program a chance to react (i.e. to say no by returning FALSE) */
 189     bool ret = drop_target->OnMove( x, y );
 190
 191     /* we don't yet handle which "actions" (i.e. copy or move)
 192        the target accepts. so far we simply accept the
 193        suggested action. TODO. */
 194     if (ret)
 195         gdk_drag_status( context, context->suggested_action, time );
 196
 197     /* after this, invalidate the drop_target's GdkDragContext */
 198     drop_target->SetDragContext( (GdkDragContext*) NULL );
 199
 200     /* this has to be done because GDK has no "drag_enter" event */
 201     drop_target->m_firstMotion = FALSE;
 202
 203     return ret;
 204 }
 205
 206 // ----------------------------------------------------------------------------
 207 // "drag_drop"
 208 // ----------------------------------------------------------------------------
 209
 210 static gboolean target_drag_drop( GtkWidget *widget,
 211                                   GdkDragContext *context,
 212                                   gint x,
 213                                   gint y,
 214                                   guint time,
 215                                   wxDropTarget *drop_target )
 216 {
 217     if (g_isIdle) wxapp_install_idle_handler();
 218
 219     /* Owen Taylor: "if the drop is not in a drop zone,
 220        return FALSE, otherwise, if you aren't accepting
 221        the drop, call gtk_drag_finish() with success == FALSE
 222        otherwise call gtk_drag_data_get()" */
 223
 224 //    printf( "drop.\n" );
 225
 226     /* this seems to make a difference between not accepting
 227        due to wrong target area and due to wrong format. let
 228        us hope that this is not required.. */
 229
 230     /* inform the wxDropTarget about the current GdkDragContext.
 231        this is only valid for the duration of this call */
 232     drop_target->SetDragContext( context );
 233
 234     /* inform the wxDropTarget about the current drag widget.
 235        this is only valid for the duration of this call */
 236     drop_target->SetDragWidget( widget );
 237
 238     /* inform the wxDropTarget about the current drag time.
 239        this is only valid for the duration of this call */
 240     drop_target->SetDragTime( time );
 241
 242     bool ret = drop_target->OnDrop( x, y );
 243
 244     if (!ret)
 245     {
 246         /* cancel the whole thing */
 247         gtk_drag_finish( context,
 248                           FALSE,        /* no success */
 249                           FALSE,        /* don't delete data on dropping side */
 250                           time );
 251     }
 252
 253     /* after this, invalidate the drop_target's GdkDragContext */
 254     drop_target->SetDragContext( (GdkDragContext*) NULL );
 255
 256     /* after this, invalidate the drop_target's drag widget */
 257     drop_target->SetDragWidget( (GtkWidget*) NULL );
 258
 259     /* this has to be done because GDK has no "drag_enter" event */
 260     drop_target->m_firstMotion = TRUE;
 261
 262     return ret;
 263 }
 264
 265 // ----------------------------------------------------------------------------
 266 // "drag_data_received"
 267 // ----------------------------------------------------------------------------
 268
 269 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 270                                        GdkDragContext *context,
 271                                        gint x,
 272                                        gint y,
 273                                        GtkSelectionData *data,
 274                                        guint WXUNUSED(info),
 275                                        guint time,
 276                                        wxDropTarget *drop_target )
 277 {
 278     if (g_isIdle) wxapp_install_idle_handler();
 279
 280     /* Owen Taylor: "call gtk_drag_finish() with
 281        success == TRUE" */
 282
 283 //    printf( "data received.\n" );
 284
 285     if ((data->length <= 0) || (data->format != 8))
 286     {
 287         /* negative data length and non 8-bit data format
 288            qualifies for junk */
 289         gtk_drag_finish (context, FALSE, FALSE, time);
 290
 291 //        printf( "no data.\n" );
 292
 293         return;
 294     }
 295
 296     /* inform the wxDropTarget about the current GtkSelectionData.
 297        this is only valid for the duration of this call */
 298     drop_target->SetDragData( data );
 299
 300     if (drop_target->OnData( x, y ))
 301     {
 302         /* tell GTK that data transfer was successfull */
 303         gtk_drag_finish( context, TRUE, FALSE, time );
 304     }
 305     else
 306     {
 307         /* tell GTK that data transfer was not successfull */
 308         gtk_drag_finish( context, FALSE, FALSE, time );
 309     }
 310
 311     /* after this, invalidate the drop_target's drag data */
 312     drop_target->SetDragData( (GtkSelectionData*) NULL );
 313 }
 314
 315 //----------------------------------------------------------------------------
 316 // wxDropTarget
 317 //----------------------------------------------------------------------------
 318
 319 wxDropTarget::wxDropTarget()
 320 {
 321     m_firstMotion = TRUE;
 322     m_dragContext = (GdkDragContext*) NULL;
 323     m_dragWidget = (GtkWidget*) NULL;
 324     m_dragData = (GtkSelectionData*) NULL;
 325     m_dragTime = 0;
 326 }
 327
 328 wxDropTarget::~wxDropTarget()
 329 {
 330 }
 331
 332 void wxDropTarget::OnEnter()
 333 {
 334 }
 335
 336 void wxDropTarget::OnLeave()
 337 {
 338 }
 339
 340 bool wxDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) )
 341 {
 342     return TRUE;
 343 }
 344
 345 bool wxDropTarget::OnDrop( int WXUNUSED(x), int WXUNUSED(y) )
 346 {
 347     return FALSE;
 348 }
 349
 350 bool wxDropTarget::OnData( int WXUNUSED(x), int WXUNUSED(y) )
 351 {
 352     return FALSE;
 353 }
 354
 355 bool wxDropTarget::RequestData( wxDataFormat format )
 356 {
 357     if (!m_dragContext) return FALSE;
 358     if (!m_dragWidget) return FALSE;
 359
 360 /*
 361     wxPrintf( _T("format: %s.\n"), format.GetId().c_str() );
 362     if (format.GetType() == wxDF_PRIVATE) wxPrintf( _T("private data.\n") );
 363     if (format.GetType() == wxDF_TEXT) wxPrintf( _T("text data.\n") );
 364 */
 365
 366     /* this should trigger an "drag_data_received" event */
 367     gtk_drag_get_data( m_dragWidget,
 368                        m_dragContext,
 369                        format.GetAtom(),
 370                        m_dragTime );
 371
 372     return TRUE;
 373 }
 374
 375 bool wxDropTarget::IsSupported( wxDataFormat format )
 376 {
 377     if (!m_dragContext) return FALSE;
 378
 379     GList *child = m_dragContext->targets;
 380     while (child)
 381     {
 382         GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
 383
 384 //        char *name = gdk_atom_name( formatAtom );
 385 //        if (name) printf( "Format available: %s.\n", name );
 386
 387         if (formatAtom == format.GetAtom()) return TRUE;
 388         child = child->next;
 389     }
 390
 391     return FALSE;
 392 }
 393
 394 bool wxDropTarget::GetData( wxDataObject *data_object )
 395 {
 396     if (!m_dragData) return FALSE;
 397
 398     if (m_dragData->target !=  data_object->GetFormat().GetAtom()) return FALSE;
 399
 400     if (data_object->GetFormat().GetType() == wxDF_TEXT)
 401     {
 402         wxTextDataObject *text_object = (wxTextDataObject*)data_object;
 403         text_object->SetText( (const char*)m_dragData->data );
 404     } else
 405
 406     if (data_object->GetFormat().GetType() == wxDF_FILENAME)
 407     {
 408     } else
 409
 410     if (data_object->GetFormat().GetType() == wxDF_PRIVATE)
 411     {
 412         wxPrivateDataObject *priv_object = (wxPrivateDataObject*)data_object;
 413         priv_object->SetData( (const char*)m_dragData->data, (size_t)m_dragData->length );
 414     }
 415
 416     return TRUE;
 417 }
 418
 419 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 420 {
 421     wxCHECK_RET( widget != NULL, _T("unregister widget is NULL") );
 422
 423     gtk_drag_dest_unset( widget );
 424
 425     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 426                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 427
 428     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 429                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 430
 431     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 432                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 433
 434     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 435                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 436 }
 437
 438 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 439 {
 440     wxCHECK_RET( widget != NULL, _T("register widget is NULL") );
 441
 442     /* gtk_drag_dest_set() determines what default behaviour we'd like
 443        GTK to supply. we don't want to specify out targets (=formats)
 444        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 445        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 446        "drag_motion" and "drag_drop" events. this makes it possible
 447        to allow dropping on only a small area. we should set
 448        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 449        highlighting if dragging over standard controls, but this
 450        seems to be broken without the other two. */
 451
 452     gtk_drag_dest_set( widget,
 453                        (GtkDestDefaults) 0,         /* no default behaviour */
 454                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 455                        0,                           /* number of targets = 0 */
 456                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 457
 458     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 459                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 460
 461     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 462                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 463
 464     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 465                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 466
 467     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 468                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 469 }
 470
 471 //-------------------------------------------------------------------------
 472 // wxTextDropTarget
 473 //-------------------------------------------------------------------------
 474
 475 bool wxTextDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) )
 476 {
 477     return IsSupported( wxDF_TEXT );
 478 }
 479
 480 bool wxTextDropTarget::OnDrop( int WXUNUSED(x), int WXUNUSED(y) )
 481 {
 482     if (IsSupported( wxDF_TEXT ))
 483     {
 484         RequestData( wxDF_TEXT );
 485         return TRUE;
 486     }
 487
 488     return FALSE;
 489 }
 490
 491 bool wxTextDropTarget::OnData( int x, int y )
 492 {
 493     wxTextDataObject data;
 494     if (!GetData( &data )) return FALSE;
 495
 496     OnDropText( x, y, data.GetText() );
 497
 498     return TRUE;
 499 }
 500
 501 //-------------------------------------------------------------------------
 502 // wxPrivateDropTarget
 503 //-------------------------------------------------------------------------
 504
 505 wxPrivateDropTarget::wxPrivateDropTarget()
 506 {
 507     m_id = wxTheApp->GetAppName();
 508 }
 509
 510 wxPrivateDropTarget::wxPrivateDropTarget( const wxString &id )
 511 {
 512     m_id = id;
 513 }
 514
 515 bool wxPrivateDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) )
 516 {
 517     return IsSupported( m_id );
 518 }
 519
 520 bool wxPrivateDropTarget::OnDrop( int WXUNUSED(x), int WXUNUSED(y) )
 521 {
 522     if (!IsSupported( m_id ))
 523     {
 524         RequestData( m_id );
 525         return FALSE;
 526     }
 527
 528     return FALSE;
 529 }
 530
 531 bool wxPrivateDropTarget::OnData( int x, int y )
 532 {
 533     if (!IsSupported( m_id )) return FALSE;
 534
 535     wxPrivateDataObject data;
 536     if (!GetData( &data )) return FALSE;
 537
 538     OnDropData( x, y, data.GetData(), data.GetSize() );
 539
 540     return TRUE;
 541 }
 542
 543 //----------------------------------------------------------------------------
 544 // A drop target which accepts files (dragged from File Manager or Explorer)
 545 //----------------------------------------------------------------------------
 546
 547 bool wxFileDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) )
 548 {
 549     return IsSupported( wxDF_FILENAME );
 550 }
 551
 552 bool wxFileDropTarget::OnDrop( int x, int y )
 553 {
 554     if (IsSupported( wxDF_FILENAME ))
 555     {
 556         RequestData( wxDF_FILENAME );
 557         return TRUE;
 558     }
 559
 560     return FALSE;
 561 }
 562
 563 bool wxFileDropTarget::OnData( int x, int y )
 564 {
 565     wxFileDataObject data;
 566     if (!GetData( &data )) return FALSE;
 567
 568     /* get number of substrings /root/mytext.txt/0/root/myothertext.txt/0/0 */
 569     size_t number = 0;
 570     size_t i;
 571     size_t size = data.GetFiles().Length();
 572     wxChar *text = WXSTRINGCAST data.GetFiles();
 573     for ( i = 0; i < size; i++)
 574         if (text[i] == 0) number++;
 575
 576     if (number == 0) return FALSE;
 577
 578     wxChar **files = new wxChar*[number];
 579
 580     text = WXSTRINGCAST data.GetFiles();
 581     for (i = 0; i < number; i++)
 582     {
 583         files[i] = text;
 584         int len = wxStrlen( text );
 585         text += len+1;
 586     }
 587
 588     OnDropFiles( x, y, number, files );
 589
 590     free( files );
 591
 592     return TRUE;
 593 }
 594
 595 //----------------------------------------------------------------------------
 596 // "drag_data_get"
 597 //----------------------------------------------------------------------------
 598
 599 static void
 600 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 601                        GdkDragContext     *context,
 602                        GtkSelectionData   *selection_data,
 603                        guint               WXUNUSED(info),
 604                        guint               WXUNUSED(time),
 605                        wxDropSource       *drop_source )
 606 {
 607     if (g_isIdle) wxapp_install_idle_handler();
 608
 609 //    printf( "Provide data!\n" );
 610
 611 //    char *name = gdk_atom_name( selection_data->target );
 612 //    if (name) printf( "Format requested: %s.\n", name );
 613
 614     wxNode *node = drop_source->m_data->m_dataObjects.First();
 615     while (node)
 616     {
 617         wxDataObject *data_object = (wxDataObject*) node->Data();
 618         if (data_object->GetFormat().GetAtom() == selection_data->target)
 619         {
 620 //            printf( "format found.\n" );
 621
 622             size_t data_size = data_object->GetSize();
 623
 624             if (data_size > 0)
 625             {
 626 //                printf( "data size: %d.\n", (int)data_size );
 627
 628                 guchar *buffer = new guchar[data_size];
 629                 data_object->WriteData( buffer );
 630
 631                 gtk_selection_data_set( selection_data,
 632                                         selection_data->target,
 633                                         8,   // 8-bit
 634                                         buffer,
 635                                         data_size );
 636
 637                 free( buffer );
 638
 639                 /* so far only copy, no moves. TODO. */
 640                 drop_source->m_retValue = wxDragCopy;
 641
 642                 return;
 643             }
 644         }
 645
 646         node = node->Next();
 647     }
 648
 649     drop_source->m_retValue = wxDragCancel;
 650 }
 651
 652 //----------------------------------------------------------------------------
 653 // "drag_data_delete"
 654 //----------------------------------------------------------------------------
 655
 656 static void source_drag_data_delete( GtkWidget          *WXUNUSED(widget),
 657                                      GdkDragContext     *WXUNUSED(context),
 658                                      wxDropSource       *drop_source )
 659 {
 660     if (g_isIdle) wxapp_install_idle_handler();
 661
 662 //    printf( "Delete the data!\n" );
 663
 664     drop_source->m_retValue = wxDragMove;
 665 }
 666
 667 //----------------------------------------------------------------------------
 668 // "drag_begin"
 669 //----------------------------------------------------------------------------
 670
 671 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 672                                GdkDragContext     *WXUNUSED(context),
 673                                wxDropSource       *WXUNUSED(drop_source) )
 674 {
 675     if (g_isIdle) wxapp_install_idle_handler();
 676
 677 //    printf( "drag_begin.\n" );
 678 }
 679
 680 //----------------------------------------------------------------------------
 681 // "drag_end"
 682 //----------------------------------------------------------------------------
 683
 684 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 685                              GdkDragContext     *WXUNUSED(context),
 686                              wxDropSource       *drop_source )
 687 {
 688     if (g_isIdle) wxapp_install_idle_handler();
 689
 690 //    printf( "drag_end.\n" );
 691
 692     drop_source->m_waiting = FALSE;
 693 }
 694
 695 //---------------------------------------------------------------------------
 696 // wxDropSource
 697 //---------------------------------------------------------------------------
 698
 699 wxDropSource::wxDropSource( wxWindow *win, const wxIcon &go, const wxIcon &stop )
 700 {
 701     g_blockEventsOnDrag = TRUE;
 702     m_waiting = TRUE;
 703
 704     m_window = win;
 705     m_widget = win->m_widget;
 706     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 707
 708     m_data = (wxDataBroker*) NULL;
 709     m_retValue = wxDragCancel;
 710
 711     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 712     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 713
 714     m_goIcon = go;
 715     if (wxNullIcon == go) m_goIcon = wxIcon( page_xpm );
 716     m_stopIcon = stop;
 717     if (wxNullIcon == stop) m_stopIcon = wxIcon( gv_xpm );
 718 }
 719
 720 wxDropSource::wxDropSource( wxDataObject *data, wxWindow *win, const wxIcon &go, const wxIcon &stop )
 721 {
 722     m_waiting = TRUE;
 723
 724     m_window = win;
 725     m_widget = win->m_widget;
 726     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 727     m_retValue = wxDragCancel;
 728
 729     if (data)
 730     {
 731         m_data = new wxDataBroker();
 732         m_data->Add( data );
 733     }
 734     else
 735     {
 736         m_data = (wxDataBroker*) NULL;
 737     }
 738
 739     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 740     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 741
 742     m_goIcon = go;
 743     if (wxNullIcon == go) m_goIcon = wxIcon( page_xpm );
 744     m_stopIcon = stop;
 745     if (wxNullIcon == stop) m_stopIcon = wxIcon( gv_xpm );
 746 }
 747
 748 wxDropSource::wxDropSource( wxDataBroker *data, wxWindow *win )
 749 {
 750     m_window = win;
 751     m_widget = win->m_widget;
 752     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 753     m_retValue = wxDragCancel;
 754
 755     m_data = data;
 756
 757     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 758     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 759 }
 760
 761 void wxDropSource::SetData( wxDataObject *data )
 762 {
 763     if (m_data) delete m_data;
 764
 765     if (data)
 766     {
 767         m_data = new wxDataBroker();
 768         m_data->Add( data );
 769     }
 770     else
 771     {
 772         m_data = (wxDataBroker*) NULL;
 773     }
 774 }
 775
 776 void wxDropSource::SetData( wxDataBroker *data )
 777 {
 778     if (m_data) delete m_data;
 779
 780     m_data = data;
 781 }
 782
 783 wxDropSource::~wxDropSource(void)
 784 {
 785     if (m_data) delete m_data;
 786
 787     g_blockEventsOnDrag = FALSE;
 788 }
 789
 790 wxDragResult wxDropSource::DoDragDrop( bool WXUNUSED(bAllowMove) )
 791 {
 792     wxASSERT_MSG( m_data, _T("wxDragSource: no data") );
 793
 794     if (!m_data) return (wxDragResult) wxDragNone;
 795
 796     g_blockEventsOnDrag = TRUE;
 797
 798     RegisterWindow();
 799
 800     m_waiting = TRUE;
 801
 802     GdkAtom atom = gdk_atom_intern( "STRING", FALSE );
 803 //    wxPrintf( _T("atom id: %d.\n"), (int)atom );
 804
 805     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 806     gtk_target_list_add( target_list, atom, 0, 0 );
 807
 808     GdkEventMotion event;
 809     event.window = m_widget->window;
 810     int x = 0;
 811     int y = 0;
 812     GdkModifierType state;
 813     gdk_window_get_pointer( event.window, &x, &y, &state );
 814     event.x = x;
 815     event.y = y;
 816     event.state = state;
 817     event.time = GDK_CURRENT_TIME;
 818
 819     /* GTK wants to know which button was pressed which caused the dragging */
 820     int button_number = 0;
 821     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 822     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 823     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 824
 825     /* don't start dragging if no button is down */
 826     if (button_number)
 827     {
 828         GdkDragContext *context = gtk_drag_begin( m_widget,
 829                                               target_list,
 830                                               GDK_ACTION_COPY,
 831                                               button_number,  /* number of mouse button which started drag */
 832                                               (GdkEvent*) &event );
 833
 834         wxMask *mask = m_goIcon.GetMask();
 835         GdkBitmap *bm = (GdkBitmap *) NULL;
 836         if (mask) bm = mask->GetBitmap();
 837         GdkPixmap *pm = m_goIcon.GetPixmap();
 838
 839         gtk_drag_set_icon_pixmap( context,
 840                                   gtk_widget_get_colormap( m_widget ),
 841                                   pm,
 842                                   bm,
 843                                   0,
 844                                   0 );
 845
 846         while (m_waiting) gtk_main_iteration();;
 847     }
 848
 849     g_blockEventsOnDrag = FALSE;
 850
 851     UnregisterWindow();
 852
 853     return m_retValue;
 854 }
 855
 856 void wxDropSource::RegisterWindow()
 857 {
 858     if (!m_widget) return;
 859
 860     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 861                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 862     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 863                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 864     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 865                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 866     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 867                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 868
 869 }
 870
 871 void wxDropSource::UnregisterWindow()
 872 {
 873     if (!m_widget) return;
 874
 875     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 876                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 877     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 878                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 879     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 880                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 881     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 882                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 883 }
 884
 885 #endif
 886
 887       // wxUSE_DRAG_AND_DROP