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