src/gtk/dnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        dnd.cpp
   3 // Purpose:     wxDropTarget class
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 #ifdef __GNUG__
  11 #pragma implementation "dnd.h"
  12 #endif
  13
  14 #include "wx/dnd.h"
  15
  16 #if wxUSE_DRAG_AND_DROP
  17
  18 #include "wx/window.h"
  19 #include "wx/app.h"
  20 #include "wx/gdicmn.h"
  21 #include "wx/intl.h"
  22 #include "wx/utils.h"
  23
  24 #include "gdk/gdk.h"
  25 #include "gtk/gtk.h"
  26 #include "gdk/gdkprivate.h"
  27
  28 #include "gtk/gtkdnd.h"
  29 #include "gtk/gtkselection.h"
  30
  31 //-----------------------------------------------------------------------------
  32 // idle system
  33 //-----------------------------------------------------------------------------
  34
  35 extern void wxapp_install_idle_handler();
  36 extern bool g_isIdle;
  37
  38 //-----------------------------------------------------------------------------
  39 // thread system
  40 //-----------------------------------------------------------------------------
  41
  42 #if wxUSE_THREADS
  43 extern void wxapp_install_thread_wakeup();
  44 extern void wxapp_uninstall_thread_wakeup();
  45 #endif
  46
  47 //----------------------------------------------------------------------------
  48 // global data
  49 //----------------------------------------------------------------------------
  50
  51 extern bool g_blockEventsOnDrag;
  52
  53 //----------------------------------------------------------------------------
  54 // standard icons
  55 //----------------------------------------------------------------------------
  56
  57 /* XPM */
  58 static char * gv_xpm[] = {
  59 "40 34 3 1",
  60 "         s None c None",
  61 ".        c black",
  62 "X        c white",
  63 "                                        ",
  64 "                                        ",
  65 "                  ......                ",
  66 "                ..XXXXXX..              ",
  67 "               .XXXXXXXXXX.             ",
  68 "              .XXXXXXXXXXXX.            ",
  69 "              .XXXXXXXXXXXX.            ",
  70 "             .XXXXXXXXXXXXXX.           ",
  71 "             .XXX..XXXX..XXX.           ",
  72 "          ....XX....XX....XX.           ",
  73 "         .XXX.XXX..XXXX..XXX....        ",
  74 "        .XXXXXXXXXXXXXXXXXXX.XXX.       ",
  75 "        .XXXXXXXXXXXXXXXXXXXXXXXX.      ",
  76 "        .XXXXXXXXXXXXXXXXXXXXXXXX.      ",
  77 "         ..XXXXXXXXXXXXXXXXXXXXXX.      ",
  78 "           .XXXXXXXXXXXXXXXXXX...       ",
  79 "           ..XXXXXXXXXXXXXXXX.          ",
  80 "            .XXXXXXXXXXXXXXXX.          ",
  81 "            .XXXXXXXXXXXXXXXX.          ",
  82 "            .XXXXXXXXXXXXXXXXX.         ",
  83 "            .XXXXXXXXXXXXXXXXX.         ",
  84 "            .XXXXXXXXXXXXXXXXXX.        ",
  85 "            .XXXXXXXXXXXXXXXXXXX.       ",
  86 "           .XXXXXXXXXXXXXXXXXXXXX.      ",
  87 "           .XXXXXXXXXXXXXX.XXXXXXX.     ",
  88 "          .XXXXXXX.XXXXXXX.XXXXXXX.     ",
  89 "         .XXXXXXXX.XXXXXXX.XXXXXXX.     ",
  90 "         .XXXXXXX...XXXXX...XXXXX.      ",
  91 "         .XXXXXXX.  .....   .....       ",
  92 "         ..XXXX..                       ",
  93 "           ....                         ",
  94 "                                        ",
  95 "                                        ",
  96 "                                        "};
  97
  98 /* XPM */
  99 static char * page_xpm[] = {
 100 /* width height ncolors chars_per_pixel */
 101 "32 32 5 1",
 102 /* colors */
 103 "         s None        c None",
 104 ".        c black",
 105 "X        c wheat",
 106 "o        c tan",
 107 "O        c #6699FF",
 108 /* pixels */
 109 "    ...................         ",
 110 "    .XXXXXXXXXXXXXXXXX..        ",
 111 "    .XXXXXXXXXXXXXXXXX.o.       ",
 112 "    .XXXXXXXXXXXXXXXXX.oo.      ",
 113 "    .XXXXXXXXXXXXXXXXX.ooo.     ",
 114 "    .XXXXXXXXXXXXXXXXX.oooo.    ",
 115 "    .XXXXXXXXXXXXXXXXX.......   ",
 116 "    .XXXXXOOOOOOOOOOXXXooooo.   ",
 117 "    .XXXXXXXXXXXXXXXXXXooooo.   ",
 118 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 119 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 120 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
 121 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 122 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 123 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 124 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 125 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 126 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
 127 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 128 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 129 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 130 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 131 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 132 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 133 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 134 "    .XXXXXOOOOOOOXXXXXXXXXXX.   ",
 135 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 136 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 137 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 138 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 139 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 140 "    .........................   "};
 141
 142
 143
 144 // ----------------------------------------------------------------------------
 145 // "drag_leave"
 146 // ----------------------------------------------------------------------------
 147
 148 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 149                                GdkDragContext *context,
 150                                guint WXUNUSED(time),
 151                                wxDropTarget *drop_target )
 152 {
 153     if (g_isIdle) wxapp_install_idle_handler();
 154
 155     /* inform the wxDropTarget about the current GdkDragContext.
 156        this is only valid for the duration of this call */
 157     drop_target->SetDragContext( context );
 158
 159     /* we don't need return values. this event is just for
 160        information */
 161     drop_target->OnLeave();
 162
 163     /* this has to be done because GDK has no "drag_enter" event */
 164     drop_target->m_firstMotion = TRUE;
 165
 166     /* after this, invalidate the drop_target's GdkDragContext */
 167     drop_target->SetDragContext( (GdkDragContext*) NULL );
 168 }
 169
 170 // ----------------------------------------------------------------------------
 171 // "drag_motion"
 172 // ----------------------------------------------------------------------------
 173
 174 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 175                                     GdkDragContext *context,
 176                                     gint x,
 177                                     gint y,
 178                                     guint time,
 179                                     wxDropTarget *drop_target )
 180 {
 181     if (g_isIdle) wxapp_install_idle_handler();
 182
 183     /* Owen Taylor: "if the coordinates not in a drop zone,
 184        return FALSE, otherwise call gtk_drag_status() and
 185        return TRUE" */
 186
 187     /* inform the wxDropTarget about the current GdkDragContext.
 188        this is only valid for the duration of this call */
 189     drop_target->SetDragContext( context );
 190
 191     bool ret = FALSE;
 192
 193     if (drop_target->m_firstMotion)
 194     {
 195         /* the first "drag_motion" event substitutes a "drag_enter" event */
 196         ret = drop_target->OnEnter( x, y );
 197     }
 198     else
 199     {
 200         /* give program a chance to react (i.e. to say no by returning FALSE) */
 201         ret = drop_target->OnMove( x, y );
 202     }
 203
 204     /* we don't yet handle which "actions" (i.e. copy or move)
 205        the target accepts. so far we simply accept the
 206        suggested action. TODO. */
 207     if (ret)
 208         gdk_drag_status( context, context->suggested_action, time );
 209
 210     /* after this, invalidate the drop_target's GdkDragContext */
 211     drop_target->SetDragContext( (GdkDragContext*) NULL );
 212
 213     /* this has to be done because GDK has no "drag_enter" event */
 214     drop_target->m_firstMotion = FALSE;
 215
 216     return ret;
 217 }
 218
 219 // ----------------------------------------------------------------------------
 220 // "drag_drop"
 221 // ----------------------------------------------------------------------------
 222
 223 static gboolean target_drag_drop( GtkWidget *widget,
 224                                   GdkDragContext *context,
 225                                   gint x,
 226                                   gint y,
 227                                   guint time,
 228                                   wxDropTarget *drop_target )
 229 {
 230     if (g_isIdle) wxapp_install_idle_handler();
 231
 232     /* Owen Taylor: "if the drop is not in a drop zone,
 233        return FALSE, otherwise, if you aren't accepting
 234        the drop, call gtk_drag_finish() with success == FALSE
 235        otherwise call gtk_drag_data_get()" */
 236
 237 //    printf( "drop.\n" );
 238
 239     /* this seems to make a difference between not accepting
 240        due to wrong target area and due to wrong format. let
 241        us hope that this is not required.. */
 242
 243     /* inform the wxDropTarget about the current GdkDragContext.
 244        this is only valid for the duration of this call */
 245     drop_target->SetDragContext( context );
 246
 247     /* inform the wxDropTarget about the current drag widget.
 248        this is only valid for the duration of this call */
 249     drop_target->SetDragWidget( widget );
 250
 251     /* inform the wxDropTarget about the current drag time.
 252        this is only valid for the duration of this call */
 253     drop_target->SetDragTime( time );
 254
 255     bool ret = drop_target->OnDrop( x, y );
 256
 257     if (!ret)
 258     {
 259         wxLogDebug( wxT( "Drop target: OnDrop returned TRUE") );
 260
 261         /* cancel the whole thing */
 262         gtk_drag_finish( context,
 263                           FALSE,        /* no success */
 264                           FALSE,        /* don't delete data on dropping side */
 265                           time );
 266     }
 267     else
 268     {
 269         wxLogDebug( wxT( "Drop target: OnDrop returned TRUE") );
 270
 271 #if wxUSE_THREADS
 272         /* disable GUI threads */
 273         wxapp_uninstall_thread_wakeup();
 274 #endif
 275
 276         GdkAtom format = drop_target->GetMatchingPair();
 277         wxASSERT( format );
 278
 279         /* this should trigger an "drag_data_received" event */
 280         gtk_drag_get_data( widget,
 281                            context,
 282                            format,
 283                            time );
 284
 285 #if wxUSE_THREADS
 286         /* re-enable GUI threads */
 287         wxapp_install_thread_wakeup();
 288 #endif
 289     }
 290
 291     /* after this, invalidate the drop_target's GdkDragContext */
 292     drop_target->SetDragContext( (GdkDragContext*) NULL );
 293
 294     /* after this, invalidate the drop_target's drag widget */
 295     drop_target->SetDragWidget( (GtkWidget*) NULL );
 296
 297     /* this has to be done because GDK has no "drag_enter" event */
 298     drop_target->m_firstMotion = TRUE;
 299
 300     return ret;
 301 }
 302
 303 // ----------------------------------------------------------------------------
 304 // "drag_data_received"
 305 // ----------------------------------------------------------------------------
 306
 307 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 308                                        GdkDragContext *context,
 309                                        gint x,
 310                                        gint y,
 311                                        GtkSelectionData *data,
 312                                        guint WXUNUSED(info),
 313                                        guint time,
 314                                        wxDropTarget *drop_target )
 315 {
 316     if (g_isIdle) wxapp_install_idle_handler();
 317
 318     /* Owen Taylor: "call gtk_drag_finish() with
 319        success == TRUE" */
 320
 321
 322     if ((data->length <= 0) || (data->format != 8))
 323     {
 324         /* negative data length and non 8-bit data format
 325            qualifies for junk */
 326         gtk_drag_finish (context, FALSE, FALSE, time);
 327
 328         return;
 329     }
 330
 331     wxLogDebug( wxT( "Drop target: data received event") );
 332
 333     /* inform the wxDropTarget about the current GtkSelectionData.
 334        this is only valid for the duration of this call */
 335     drop_target->SetDragData( data );
 336
 337     if (drop_target->OnData( x, y ))
 338     {
 339         wxLogDebug( wxT( "Drop target: OnData returned TRUE") );
 340
 341         /* tell GTK that data transfer was successfull */
 342         gtk_drag_finish( context, TRUE, FALSE, time );
 343     }
 344     else
 345     {
 346         wxLogDebug( wxT( "Drop target: OnData returned FALSE") );
 347
 348         /* tell GTK that data transfer was not successfull */
 349         gtk_drag_finish( context, FALSE, FALSE, time );
 350     }
 351
 352     /* after this, invalidate the drop_target's drag data */
 353     drop_target->SetDragData( (GtkSelectionData*) NULL );
 354 }
 355
 356 //----------------------------------------------------------------------------
 357 // wxDropTarget
 358 //----------------------------------------------------------------------------
 359
 360 wxDropTarget::wxDropTarget( wxDataObject *data )
 361   : wxDropTargetBase( data )
 362 {
 363     m_firstMotion = TRUE;
 364     m_dragContext = (GdkDragContext*) NULL;
 365     m_dragWidget = (GtkWidget*) NULL;
 366     m_dragData = (GtkSelectionData*) NULL;
 367     m_dragTime = 0;
 368 }
 369
 370 bool wxDropTarget::OnEnter( int WXUNUSED(x), int WXUNUSED(y) )
 371 {
 372     if (!m_dataObject)
 373         return FALSE;
 374
 375     return (GetMatchingPair() != (GdkAtom) 0);
 376 }
 377
 378 bool wxDropTarget::OnMove( int WXUNUSED(x), int WXUNUSED(y) )
 379 {
 380     if (!m_dataObject)
 381         return FALSE;
 382
 383     return (GetMatchingPair() != (GdkAtom) 0);
 384 }
 385
 386 bool wxDropTarget::OnDrop( int WXUNUSED(x), int WXUNUSED(y) )
 387 {
 388     if (!m_dataObject)
 389         return FALSE;
 390
 391     return (GetMatchingPair() != (GdkAtom) 0);
 392 }
 393
 394 bool wxDropTarget::OnData( int WXUNUSED(x), int WXUNUSED(y) )
 395 {
 396     if (!m_dataObject)
 397         return FALSE;
 398
 399     if (GetMatchingPair() == (GdkAtom) 0)
 400         return FALSE;
 401
 402     return GetData();
 403 }
 404
 405 GdkAtom wxDropTarget::GetMatchingPair()
 406 {
 407     if (!m_dataObject)
 408         return (GdkAtom) 0;
 409
 410     if (!m_dragContext)
 411         return (GdkAtom) 0;
 412
 413     GList *child = m_dragContext->targets;
 414     while (child)
 415     {
 416         GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
 417         wxDataFormat format( formatAtom );
 418
 419 #ifdef __WXDEBUG__
 420         char *name = gdk_atom_name( formatAtom );
 421         if (name) wxLogDebug( "Drop target: drag has format: %s", name );
 422 #endif
 423         if (m_dataObject->IsSupportedFormat( format ))
 424             return formatAtom;
 425
 426         child = child->next;
 427     }
 428
 429     return (GdkAtom) 0;
 430 }
 431
 432 bool wxDropTarget::GetData()
 433 {
 434     if (!m_dragData)
 435         return FALSE;
 436
 437     if (!m_dataObject)
 438         return FALSE;
 439
 440     wxDataFormat dragFormat( m_dragData->target );
 441
 442     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 443         return FALSE;
 444
 445     if (dragFormat.GetType() == wxDF_TEXT)
 446     {
 447         wxTextDataObject *text_object = (wxTextDataObject*)m_dataObject;
 448         text_object->SetText( (const char*)m_dragData->data );
 449         return TRUE;
 450     }
 451
 452     if (dragFormat.GetType() == wxDF_FILENAME)
 453     {
 454         wxFileDataObject *file_object = (wxFileDataObject*)m_dataObject;
 455         file_object->SetData( 0, (const char*)m_dragData->data );
 456         return TRUE;
 457     }
 458
 459     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 460
 461     return TRUE;
 462 }
 463
 464 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 465 {
 466     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 467
 468     gtk_drag_dest_unset( widget );
 469
 470     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 471                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 472
 473     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 474                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 475
 476     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 477                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 478
 479     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 480                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 481 }
 482
 483 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 484 {
 485     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 486
 487     /* gtk_drag_dest_set() determines what default behaviour we'd like
 488        GTK to supply. we don't want to specify out targets (=formats)
 489        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 490        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 491        "drag_motion" and "drag_drop" events. this makes it possible
 492        to allow dropping on only a small area. we should set
 493        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 494        highlighting if dragging over standard controls, but this
 495        seems to be broken without the other two. */
 496
 497     gtk_drag_dest_set( widget,
 498                        (GtkDestDefaults) 0,         /* no default behaviour */
 499                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 500                        0,                           /* number of targets = 0 */
 501                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 502
 503     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 504                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 505
 506     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 507                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 508
 509     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 510                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 511
 512     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 513                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 514 }
 515
 516 // ----------------------------------------------------------------------------
 517 // wxTextDropTarget
 518 // ----------------------------------------------------------------------------
 519
 520 wxTextDropTarget::wxTextDropTarget()
 521                 : wxDropTarget(new wxTextDataObject)
 522 {
 523 }
 524
 525 bool wxTextDropTarget::OnData(wxCoord x, wxCoord y)
 526 {
 527     if ( !GetData() )
 528         return FALSE;
 529
 530     return OnDropText(x, y, ((wxTextDataObject *)m_dataObject)->GetText());
 531 }
 532
 533 // ----------------------------------------------------------------------------
 534 // wxFileDropTarget
 535 // ----------------------------------------------------------------------------
 536
 537 wxFileDropTarget::wxFileDropTarget()
 538                 : wxDropTarget(new wxFileDataObject)
 539 {
 540 }
 541
 542 bool wxFileDropTarget::OnData(wxCoord x, wxCoord y)
 543 {
 544     if ( !GetData() )
 545         return FALSE;
 546
 547     return OnDropFiles(x, y,
 548                        ((wxFileDataObject *)m_dataObject)->GetFilenames());
 549 }
 550
 551 //----------------------------------------------------------------------------
 552 // "drag_data_get"
 553 //----------------------------------------------------------------------------
 554
 555 static void
 556 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 557                        GdkDragContext     *context,
 558                        GtkSelectionData   *selection_data,
 559                        guint               WXUNUSED(info),
 560                        guint               WXUNUSED(time),
 561                        wxDropSource       *drop_source )
 562 {
 563     if (g_isIdle) wxapp_install_idle_handler();
 564
 565     wxDataFormat format( selection_data->target );
 566
 567     wxLogDebug( wxT("Drop source: format requested: %s"), format.GetId().c_str() );
 568
 569     drop_source->m_retValue = wxDragCancel;
 570
 571     wxDataObject *data = drop_source->GetDataObject();
 572
 573     if (!data)
 574     {
 575         wxLogDebug( wxT("Drop source: no data object") );
 576         return;
 577     }
 578
 579     if (!data->IsSupportedFormat(format))
 580     {
 581         wxLogDebug( wxT("Drop source: unsupported format") );
 582         return;
 583     }
 584
 585     if (data->GetDataSize(format) == 0)
 586     {
 587         wxLogDebug( wxT("Drop source: empty data") );
 588         return;
 589     }
 590
 591     size_t size = data->GetDataSize(format);
 592
 593 //  printf( "data size: %d.\n", (int)data_size );
 594
 595     guchar *d = new guchar[size];
 596
 597     if (!data->GetDataHere( format, (void*)d ))
 598     {
 599         delete[] d;
 600         return;
 601     }
 602
 603 #if wxUSE_THREADS
 604     /* disable GUI threads */
 605     wxapp_uninstall_thread_wakeup();
 606 #endif
 607
 608                 gtk_selection_data_set( selection_data,
 609                                         selection_data->target,
 610                                         8,   // 8-bit
 611                                         d,
 612                                         size );
 613
 614 #if wxUSE_THREADS
 615     /* enable GUI threads */
 616     wxapp_install_thread_wakeup();
 617 #endif
 618
 619     delete[] d;
 620
 621     /* so far only copy, no moves. TODO. */
 622     drop_source->m_retValue = wxDragCopy;
 623 }
 624
 625 //----------------------------------------------------------------------------
 626 // "drag_data_delete"
 627 //----------------------------------------------------------------------------
 628
 629 static void source_drag_data_delete( GtkWidget          *WXUNUSED(widget),
 630                                      GdkDragContext     *WXUNUSED(context),
 631                                      wxDropSource       *drop_source )
 632 {
 633     if (g_isIdle) wxapp_install_idle_handler();
 634
 635 //  printf( "Delete the data!\n" );
 636
 637     drop_source->m_retValue = wxDragMove;
 638 }
 639
 640 //----------------------------------------------------------------------------
 641 // "drag_begin"
 642 //----------------------------------------------------------------------------
 643
 644 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 645                                GdkDragContext     *WXUNUSED(context),
 646                                wxDropSource       *WXUNUSED(drop_source) )
 647 {
 648     if (g_isIdle) wxapp_install_idle_handler();
 649
 650 //  printf( "drag_begin.\n" );
 651 }
 652
 653 //----------------------------------------------------------------------------
 654 // "drag_end"
 655 //----------------------------------------------------------------------------
 656
 657 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 658                              GdkDragContext     *WXUNUSED(context),
 659                              wxDropSource       *drop_source )
 660 {
 661     if (g_isIdle) wxapp_install_idle_handler();
 662
 663 //  printf( "drag_end.\n" );
 664
 665     drop_source->m_waiting = FALSE;
 666 }
 667
 668 //---------------------------------------------------------------------------
 669 // wxDropSource
 670 //---------------------------------------------------------------------------
 671
 672 wxDropSource::wxDropSource( wxWindow *win, const wxIcon &go, const wxIcon &stop )
 673 {
 674     g_blockEventsOnDrag = TRUE;
 675     m_waiting = TRUE;
 676
 677     m_window = win;
 678     m_widget = win->m_widget;
 679     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 680
 681     m_retValue = wxDragCancel;
 682
 683     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 684     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 685
 686     m_goIcon = go;
 687     if (wxNullIcon == go) m_goIcon = wxIcon( page_xpm );
 688     m_stopIcon = stop;
 689     if (wxNullIcon == stop) m_stopIcon = wxIcon( gv_xpm );
 690 }
 691
 692 wxDropSource::wxDropSource( wxDataObject& data, wxWindow *win,
 693                             const wxIcon &go, const wxIcon &stop )
 694 {
 695     m_waiting = TRUE;
 696
 697     SetData( data );
 698
 699     m_window = win;
 700     m_widget = win->m_widget;
 701     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 702     m_retValue = wxDragCancel;
 703
 704     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 705     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 706
 707     m_goIcon = go;
 708     if (wxNullIcon == go) m_goIcon = wxIcon( page_xpm );
 709     m_stopIcon = stop;
 710     if (wxNullIcon == stop) m_stopIcon = wxIcon( gv_xpm );
 711 }
 712
 713 wxDropSource::~wxDropSource()
 714 {
 715     g_blockEventsOnDrag = FALSE;
 716 }
 717
 718 wxDragResult wxDropSource::DoDragDrop( bool WXUNUSED(bAllowMove) )
 719 {
 720     wxASSERT_MSG( m_data, wxT("wxDragSource: no data") );
 721
 722     if (!m_data)
 723         return (wxDragResult) wxDragNone;
 724
 725     if (m_data->GetFormatCount() == 0)
 726         return (wxDragResult) wxDragNone;
 727
 728     g_blockEventsOnDrag = TRUE;
 729
 730     RegisterWindow();
 731
 732     m_waiting = TRUE;
 733
 734     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 735
 736     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 737     m_data->GetAllFormats( array );
 738     for (size_t i = 0; i < m_data->GetFormatCount(); i++)
 739     {
 740         GdkAtom atom = array[i];
 741         wxLogDebug( wxT("Supported atom %s"), gdk_atom_name( atom ) );
 742         gtk_target_list_add( target_list, atom, 0, 0 );
 743     }
 744     delete[] array;
 745
 746     GdkEventMotion event;
 747     event.window = m_widget->window;
 748     int x = 0;
 749     int y = 0;
 750     GdkModifierType state;
 751     gdk_window_get_pointer( event.window, &x, &y, &state );
 752     event.x = x;
 753     event.y = y;
 754     event.state = state;
 755     event.time = GDK_CURRENT_TIME;
 756
 757     /* GTK wants to know which button was pressed which caused the dragging */
 758     int button_number = 0;
 759     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 760     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 761     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 762
 763 #if wxUSE_THREADS
 764     /* disable GUI threads */
 765     wxapp_uninstall_thread_wakeup();
 766 #endif
 767
 768     /* don't start dragging if no button is down */
 769     if (button_number)
 770     {
 771         GdkDragContext *context = gtk_drag_begin( m_widget,
 772                                               target_list,
 773                                               GDK_ACTION_COPY,
 774                                               button_number,  /* number of mouse button which started drag */
 775                                               (GdkEvent*) &event );
 776
 777         wxMask *mask = m_goIcon.GetMask();
 778         GdkBitmap *bm = (GdkBitmap *) NULL;
 779         if (mask) bm = mask->GetBitmap();
 780         GdkPixmap *pm = m_goIcon.GetPixmap();
 781
 782         gtk_drag_set_icon_pixmap( context,
 783                                   gtk_widget_get_colormap( m_widget ),
 784                                   pm,
 785                                   bm,
 786                                   0,
 787                                   0 );
 788
 789         while (m_waiting) gtk_main_iteration();;
 790     }
 791
 792 #if wxUSE_THREADS
 793     /* re-enable GUI threads */
 794     wxapp_install_thread_wakeup();
 795 #endif
 796
 797     g_blockEventsOnDrag = FALSE;
 798
 799     UnregisterWindow();
 800
 801     return m_retValue;
 802 }
 803
 804 void wxDropSource::RegisterWindow()
 805 {
 806     if (!m_widget) return;
 807
 808     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 809                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 810     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 811                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 812     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 813                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 814     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 815                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 816
 817 }
 818
 819 void wxDropSource::UnregisterWindow()
 820 {
 821     if (!m_widget) return;
 822
 823     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 824                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 825     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 826                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 827     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 828                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 829     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 830                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 831 }
 832
 833 #endif
 834
 835       // wxUSE_DRAG_AND_DROP