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 // 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 //      printf( "no data.\n" );
 277
 278         return;
 279     }
 280
 281     /* inform the wxDropTarget about the current GtkSelectionData.
 282        this is only valid for the duration of this call */
 283     drop_target->SetDragData( data );
 284
 285     if (drop_target->OnData( x, y ))
 286     {
 287         /* tell GTK that data transfer was successfull */
 288         gtk_drag_finish( context, TRUE, FALSE, time );
 289     }
 290     else
 291     {
 292         /* tell GTK that data transfer was not successfull */
 293         gtk_drag_finish( context, FALSE, FALSE, time );
 294     }
 295
 296     /* after this, invalidate the drop_target's drag data */
 297     drop_target->SetDragData( (GtkSelectionData*) NULL );
 298 }
 299
 300 //----------------------------------------------------------------------------
 301 // wxDropTarget
 302 //----------------------------------------------------------------------------
 303
 304 wxDropTarget::wxDropTarget()
 305 {
 306     m_firstMotion = TRUE;
 307     m_dragContext = (GdkDragContext*) NULL;
 308     m_dragWidget = (GtkWidget*) NULL;
 309     m_dragData = (GtkSelectionData*) NULL;
 310     m_dragTime = 0;
 311 }
 312
 313 wxDropTarget::~wxDropTarget()
 314 {
 315 }
 316
 317 void wxDropTarget::OnEnter()
 318 {
 319 }
 320
 321 void wxDropTarget::OnLeave()
 322 {
 323 }
 324
 325 bool wxDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) )
 326 {
 327     return TRUE;
 328 }
 329
 330 bool wxDropTarget::OnDrop( int WXUNUSED(x), int WXUNUSED(y) )
 331 {
 332     return FALSE;
 333 }
 334
 335 bool wxDropTarget::OnData( int WXUNUSED(x), int WXUNUSED(y) )
 336 {
 337     return FALSE;
 338 }
 339
 340 bool wxDropTarget::RequestData( wxDataFormat format )
 341 {
 342     if (!m_dragContext) return FALSE;
 343     if (!m_dragWidget) return FALSE;
 344
 345 /*
 346     wxPrintf( _T("format: %s.\n"), format.GetId().c_str() );
 347     if (format.GetType() == wxDF_PRIVATE) wxPrintf( _T("private data.\n") );
 348     if (format.GetType() == wxDF_TEXT) wxPrintf( _T("text data.\n") );
 349 */
 350
 351     /* this should trigger an "drag_data_received" event */
 352     gtk_drag_get_data( m_dragWidget,
 353                        m_dragContext,
 354                        format.GetAtom(),
 355                        m_dragTime );
 356
 357     return TRUE;
 358 }
 359
 360 bool wxDropTarget::IsSupported( wxDataFormat format )
 361 {
 362     if (!m_dragContext) return FALSE;
 363
 364     GList *child = m_dragContext->targets;
 365     while (child)
 366     {
 367         GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
 368
 369 //        char *name = gdk_atom_name( formatAtom );
 370 //        if (name) printf( "Format available: %s.\n", name );
 371
 372         if (formatAtom == format.GetAtom()) return TRUE;
 373         child = child->next;
 374     }
 375
 376     return FALSE;
 377 }
 378
 379 bool wxDropTarget::GetData( wxDataObject *data_object )
 380 {
 381     if (!m_dragData) return FALSE;
 382
 383     if (m_dragData->target !=  data_object->GetFormat().GetAtom()) return FALSE;
 384
 385     if (data_object->GetFormat().GetType() == wxDF_TEXT)
 386     {
 387         wxTextDataObject *text_object = (wxTextDataObject*)data_object;
 388         text_object->SetText( (const char*)m_dragData->data );
 389     } else
 390
 391     if (data_object->GetFormat().GetType() == wxDF_FILENAME)
 392     {
 393     } else
 394
 395     if (data_object->GetFormat().GetType() == wxDF_PRIVATE)
 396     {
 397         wxPrivateDataObject *priv_object = (wxPrivateDataObject*)data_object;
 398         priv_object->SetData( (const char*)m_dragData->data, (size_t)m_dragData->length );
 399     }
 400
 401     return TRUE;
 402 }
 403
 404 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 405 {
 406     wxCHECK_RET( widget != NULL, _T("unregister widget is NULL") );
 407
 408     gtk_drag_dest_unset( widget );
 409
 410     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 411                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 412
 413     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 414                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 415
 416     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 417                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 418
 419     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 420                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 421 }
 422
 423 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 424 {
 425     wxCHECK_RET( widget != NULL, _T("register widget is NULL") );
 426
 427     /* gtk_drag_dest_set() determines what default behaviour we'd like
 428        GTK to supply. we don't want to specify out targets (=formats)
 429        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 430        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 431        "drag_motion" and "drag_drop" events. this makes it possible
 432        to allow dropping on only a small area. we should set
 433        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 434        highlighting if dragging over standard controls, but this
 435        seems to be broken without the other two. */
 436
 437     gtk_drag_dest_set( widget,
 438                        (GtkDestDefaults) 0,         /* no default behaviour */
 439                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 440                        0,                           /* number of targets = 0 */
 441                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 442
 443     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 444                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 445
 446     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 447                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 448
 449     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 450                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 451
 452     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 453                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 454 }
 455
 456 //-------------------------------------------------------------------------
 457 // wxTextDropTarget
 458 //-------------------------------------------------------------------------
 459
 460 bool wxTextDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) )
 461 {
 462     return IsSupported( wxDF_TEXT );
 463 }
 464
 465 bool wxTextDropTarget::OnDrop( int WXUNUSED(x), int WXUNUSED(y) )
 466 {
 467     if (IsSupported( wxDF_TEXT ))
 468     {
 469         RequestData( wxDF_TEXT );
 470         return TRUE;
 471     }
 472
 473     return FALSE;
 474 }
 475
 476 bool wxTextDropTarget::OnData( int x, int y )
 477 {
 478     wxTextDataObject data;
 479     if (!GetData( &data )) return FALSE;
 480
 481     OnDropText( x, y, data.GetText() );
 482
 483     return TRUE;
 484 }
 485
 486 //-------------------------------------------------------------------------
 487 // wxPrivateDropTarget
 488 //-------------------------------------------------------------------------
 489
 490 wxPrivateDropTarget::wxPrivateDropTarget()
 491 {
 492     m_id = wxTheApp->GetAppName();
 493 }
 494
 495 wxPrivateDropTarget::wxPrivateDropTarget( const wxString &id )
 496 {
 497     m_id = id;
 498 }
 499
 500 bool wxPrivateDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) )
 501 {
 502     return IsSupported( m_id );
 503 }
 504
 505 bool wxPrivateDropTarget::OnDrop( int WXUNUSED(x), int WXUNUSED(y) )
 506 {
 507     if (!IsSupported( m_id ))
 508     {
 509         RequestData( m_id );
 510         return FALSE;
 511     }
 512
 513     return FALSE;
 514 }
 515
 516 bool wxPrivateDropTarget::OnData( int x, int y )
 517 {
 518     if (!IsSupported( m_id )) return FALSE;
 519
 520     wxPrivateDataObject data;
 521     if (!GetData( &data )) return FALSE;
 522
 523     OnDropData( x, y, data.GetData(), data.GetSize() );
 524
 525     return TRUE;
 526 }
 527
 528 //----------------------------------------------------------------------------
 529 // A drop target which accepts files (dragged from File Manager or Explorer)
 530 //----------------------------------------------------------------------------
 531
 532 bool wxFileDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) )
 533 {
 534     return IsSupported( wxDF_FILENAME );
 535 }
 536
 537 bool wxFileDropTarget::OnDrop( int x, int y )
 538 {
 539     if (IsSupported( wxDF_FILENAME ))
 540     {
 541         RequestData( wxDF_FILENAME );
 542         return TRUE;
 543     }
 544
 545     return FALSE;
 546 }
 547
 548 bool wxFileDropTarget::OnData( int x, int y )
 549 {
 550     wxFileDataObject data;
 551     if (!GetData( &data )) return FALSE;
 552
 553     /* get number of substrings /root/mytext.txt/0/root/myothertext.txt/0/0 */
 554     size_t number = 0;
 555     size_t i;
 556     size_t size = data.GetFiles().Length();
 557     wxChar *text = WXSTRINGCAST data.GetFiles();
 558     for ( i = 0; i < size; i++)
 559         if (text[i] == 0) number++;
 560
 561     if (number == 0) return FALSE;
 562
 563     wxChar **files = new wxChar*[number];
 564
 565     text = WXSTRINGCAST data.GetFiles();
 566     for (i = 0; i < number; i++)
 567     {
 568         files[i] = text;
 569         int len = wxStrlen( text );
 570         text += len+1;
 571     }
 572
 573     OnDropFiles( x, y, number, files );
 574
 575     free( files );
 576
 577     return TRUE;
 578 }
 579
 580 //----------------------------------------------------------------------------
 581 // "drag_data_get"
 582 //----------------------------------------------------------------------------
 583
 584 static void
 585 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 586                        GdkDragContext     *context,
 587                        GtkSelectionData   *selection_data,
 588                        guint               WXUNUSED(info),
 589                        guint               WXUNUSED(time),
 590                        wxDropSource       *drop_source )
 591 {
 592 //    printf( "Provide data!\n" );
 593
 594 //    char *name = gdk_atom_name( selection_data->target );
 595 //    if (name) printf( "Format requested: %s.\n", name );
 596
 597     wxNode *node = drop_source->m_data->m_dataObjects.First();
 598     while (node)
 599     {
 600         wxDataObject *data_object = (wxDataObject*) node->Data();
 601         if (data_object->GetFormat().GetAtom() == selection_data->target)
 602         {
 603 //          printf( "format found.\n" );
 604
 605             size_t data_size = data_object->GetSize();
 606
 607             if (data_size > 0)
 608             {
 609 //              printf( "data size: %d.\n", (int)data_size );
 610
 611                 guchar *buffer = new guchar[data_size];
 612                 data_object->WriteData( buffer );
 613
 614                 gtk_selection_data_set( selection_data,
 615                                         selection_data->target,
 616                                         8,   // 8-bit
 617                                         buffer,
 618                                         data_size );
 619
 620                 free( buffer );
 621
 622                 /* so far only copy, no moves. TODO. */
 623                 drop_source->m_retValue = wxDragCopy;
 624
 625                 return;
 626             }
 627         }
 628
 629         node = node->Next();
 630     }
 631
 632     drop_source->m_retValue = wxDragCancel;
 633 }
 634
 635 //----------------------------------------------------------------------------
 636 // "drag_data_delete"
 637 //----------------------------------------------------------------------------
 638
 639 static void source_drag_data_delete( GtkWidget          *WXUNUSED(widget),
 640                                      GdkDragContext     *WXUNUSED(context),
 641                                      wxDropSource       *drop_source )
 642 {
 643 //    printf( "Delete the data!\n" );
 644
 645     drop_source->m_retValue = wxDragMove;
 646 }
 647
 648 //----------------------------------------------------------------------------
 649 // "drag_begin"
 650 //----------------------------------------------------------------------------
 651
 652 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 653                                GdkDragContext     *WXUNUSED(context),
 654                                wxDropSource       *WXUNUSED(drop_source) )
 655 {
 656 //    printf( "drag_begin.\n" );
 657 }
 658
 659 //----------------------------------------------------------------------------
 660 // "drag_end"
 661 //----------------------------------------------------------------------------
 662
 663 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 664                              GdkDragContext     *WXUNUSED(context),
 665                              wxDropSource       *drop_source )
 666 {
 667 //    printf( "drag_end.\n" );
 668
 669     drop_source->m_waiting = FALSE;
 670 }
 671
 672 //---------------------------------------------------------------------------
 673 // wxDropSource
 674 //---------------------------------------------------------------------------
 675
 676 wxDropSource::wxDropSource( wxWindow *win, const wxIcon &go, const wxIcon &stop )
 677 {
 678     g_blockEventsOnDrag = TRUE;
 679     m_waiting = TRUE;
 680
 681     m_window = win;
 682     m_widget = win->m_widget;
 683     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 684
 685     m_data = (wxDataBroker*) NULL;
 686     m_retValue = wxDragCancel;
 687
 688     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 689     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 690
 691     m_goIcon = go;
 692     if (wxNullIcon == go) m_goIcon = wxIcon( page_xpm );
 693     m_stopIcon = stop;
 694     if (wxNullIcon == stop) m_stopIcon = wxIcon( gv_xpm );
 695 }
 696
 697 wxDropSource::wxDropSource( wxDataObject *data, wxWindow *win, const wxIcon &go, const wxIcon &stop )
 698 {
 699     m_waiting = TRUE;
 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     if (data)
 707     {
 708         m_data = new wxDataBroker();
 709         m_data->Add( data );
 710     }
 711     else
 712     {
 713         m_data = (wxDataBroker*) NULL;
 714     }
 715
 716     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 717     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 718
 719     m_goIcon = go;
 720     if (wxNullIcon == go) m_goIcon = wxIcon( page_xpm );
 721     m_stopIcon = stop;
 722     if (wxNullIcon == stop) m_stopIcon = wxIcon( gv_xpm );
 723 }
 724
 725 wxDropSource::wxDropSource( wxDataBroker *data, wxWindow *win )
 726 {
 727     m_window = win;
 728     m_widget = win->m_widget;
 729     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 730     m_retValue = wxDragCancel;
 731
 732     m_data = data;
 733
 734     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 735     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 736 }
 737
 738 void wxDropSource::SetData( wxDataObject *data )
 739 {
 740     if (m_data) delete m_data;
 741
 742     if (data)
 743     {
 744         m_data = new wxDataBroker();
 745         m_data->Add( data );
 746     }
 747     else
 748     {
 749         m_data = (wxDataBroker*) NULL;
 750     }
 751 }
 752
 753 void wxDropSource::SetData( wxDataBroker *data )
 754 {
 755     if (m_data) delete m_data;
 756
 757     m_data = data;
 758 }
 759
 760 wxDropSource::~wxDropSource(void)
 761 {
 762     if (m_data) delete m_data;
 763
 764     g_blockEventsOnDrag = FALSE;
 765 }
 766
 767 wxDragResult wxDropSource::DoDragDrop( bool WXUNUSED(bAllowMove) )
 768 {
 769     wxASSERT_MSG( m_data, _T("wxDragSource: no data") );
 770
 771     if (!m_data) return (wxDragResult) wxDragNone;
 772
 773     g_blockEventsOnDrag = TRUE;
 774
 775     RegisterWindow();
 776
 777     m_waiting = TRUE;
 778
 779     GdkAtom atom = gdk_atom_intern( "STRING", FALSE );
 780 //    wxPrintf( _T("atom id: %d.\n"), (int)atom );
 781
 782     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 783     gtk_target_list_add( target_list, atom, 0, 0 );
 784
 785     GdkEventMotion event;
 786     event.window = m_widget->window;
 787     int x = 0;
 788     int y = 0;
 789     GdkModifierType state;
 790     gdk_window_get_pointer( event.window, &x, &y, &state );
 791     event.x = x;
 792     event.y = y;
 793     event.state = state;
 794     event.time = GDK_CURRENT_TIME;
 795
 796     /* GTK wants to know which button was pressed which caused the dragging */
 797     int button_number = 0;
 798     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 799     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 800     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 801
 802     /* don't start dragging if no button is down */
 803     if (button_number)
 804     {
 805         GdkDragContext *context = gtk_drag_begin( m_widget,
 806                                               target_list,
 807                                               GDK_ACTION_COPY,
 808                                               button_number,  /* number of mouse button which started drag */
 809                                               (GdkEvent*) &event );
 810
 811         wxMask *mask = m_goIcon.GetMask();
 812         GdkBitmap *bm = (GdkBitmap *) NULL;
 813         if (mask) bm = mask->GetBitmap();
 814         GdkPixmap *pm = m_goIcon.GetPixmap();
 815
 816         gtk_drag_set_icon_pixmap( context,
 817                                   gtk_widget_get_colormap( m_widget ),
 818                                   pm,
 819                                   bm,
 820                                   0,
 821                                   0 );
 822
 823         while (m_waiting) gtk_main_iteration();;
 824     }
 825
 826     g_blockEventsOnDrag = FALSE;
 827
 828     UnregisterWindow();
 829
 830     return m_retValue;
 831 }
 832
 833 void wxDropSource::RegisterWindow()
 834 {
 835     if (!m_widget) return;
 836
 837     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 838                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 839     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 840                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 841     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 842                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 843     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 844                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 845
 846 }
 847
 848 void wxDropSource::UnregisterWindow()
 849 {
 850     if (!m_widget) return;
 851
 852     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 853                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 854     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 855                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 856     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 857                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 858     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 859                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 860 }
 861
 862 #endif
 863
 864       // wxUSE_DRAG_AND_DROP