src/gtk1/dnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        dnd.cpp
   3 // Purpose:     wxDropTarget class
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 #ifdef __GNUG__
  11     #pragma implementation "dnd.h"
  12 #endif
  13
  14 #include "wx/dnd.h"
  15
  16 #if wxUSE_DRAG_AND_DROP
  17
  18 #include "wx/window.h"
  19 #include "wx/app.h"
  20 #include "wx/gdicmn.h"
  21 #include "wx/intl.h"
  22 #include "wx/utils.h"
  23
  24 #include "wx/gtk/private.h"
  25
  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 #endif
  44
  45 //----------------------------------------------------------------------------
  46 // global data
  47 //----------------------------------------------------------------------------
  48
  49 extern bool g_blockEventsOnDrag;
  50
  51 // the flags used for the last DoDragDrop()
  52 static long gs_flagsForDrag = 0;
  53
  54 // the trace mask we use with wxLogTrace() - call
  55 // wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
  56 // (there are quite a few of them, so don't enable this by default)
  57 static const wxChar *TRACE_DND = _T("dnd");
  58
  59 //----------------------------------------------------------------------------
  60 // standard icons
  61 //----------------------------------------------------------------------------
  62
  63 /* XPM */
  64 static const char * page_xpm[] = {
  65 /* width height ncolors chars_per_pixel */
  66 "32 32 5 1",
  67 /* colors */
  68 "         s None        c None",
  69 ".        c black",
  70 "X        c wheat",
  71 "o        c tan",
  72 "O        c #6699FF",
  73 /* pixels */
  74 "    ...................         ",
  75 "    .XXXXXXXXXXXXXXXXX..        ",
  76 "    .XXXXXXXXXXXXXXXXX.o.       ",
  77 "    .XXXXXXXXXXXXXXXXX.oo.      ",
  78 "    .XXXXXXXXXXXXXXXXX.ooo.     ",
  79 "    .XXXXXXXXXXXXXXXXX.oooo.    ",
  80 "    .XXXXXXXXXXXXXXXXX.......   ",
  81 "    .XXXXXOOOOOOOOOOXXXooooo.   ",
  82 "    .XXXXXXXXXXXXXXXXXXooooo.   ",
  83 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
  84 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  85 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
  86 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  87 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
  88 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  89 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
  90 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  91 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
  92 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  93 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
  94 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  95 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
  96 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  97 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
  98 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  99 "    .XXXXXOOOOOOOXXXXXXXXXXX.   ",
 100 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 101 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 102 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 103 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 104 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 105 "    .........................   "};
 106
 107
 108 // ============================================================================
 109 // private functions
 110 // ============================================================================
 111
 112 // ----------------------------------------------------------------------------
 113 // convert between GTK+ and wxWindows DND constants
 114 // ----------------------------------------------------------------------------
 115
 116 static wxDragResult ConvertFromGTK(long action)
 117 {
 118     switch ( action )
 119     {
 120         case GDK_ACTION_COPY:
 121             return wxDragCopy;
 122
 123         case GDK_ACTION_LINK:
 124             return wxDragLink;
 125
 126         case GDK_ACTION_MOVE:
 127             return wxDragMove;
 128     }
 129
 130     return wxDragNone;
 131 }
 132
 133 // ----------------------------------------------------------------------------
 134 // "drag_leave"
 135 // ----------------------------------------------------------------------------
 136
 137 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 138                                GdkDragContext *context,
 139                                guint WXUNUSED(time),
 140                                wxDropTarget *drop_target )
 141 {
 142     if (g_isIdle) wxapp_install_idle_handler();
 143
 144     /* inform the wxDropTarget about the current GdkDragContext.
 145        this is only valid for the duration of this call */
 146     drop_target->SetDragContext( context );
 147
 148     /* we don't need return values. this event is just for
 149        information */
 150     drop_target->OnLeave();
 151
 152     /* this has to be done because GDK has no "drag_enter" event */
 153     drop_target->m_firstMotion = TRUE;
 154
 155     /* after this, invalidate the drop_target's GdkDragContext */
 156     drop_target->SetDragContext( (GdkDragContext*) NULL );
 157 }
 158
 159 // ----------------------------------------------------------------------------
 160 // "drag_motion"
 161 // ----------------------------------------------------------------------------
 162
 163 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 164                                     GdkDragContext *context,
 165                                     gint x,
 166                                     gint y,
 167                                     guint time,
 168                                     wxDropTarget *drop_target )
 169 {
 170     if (g_isIdle) wxapp_install_idle_handler();
 171
 172     /* Owen Taylor: "if the coordinates not in a drop zone,
 173        return FALSE, otherwise call gtk_drag_status() and
 174        return TRUE" */
 175
 176     /* inform the wxDropTarget about the current GdkDragContext.
 177        this is only valid for the duration of this call */
 178     drop_target->SetDragContext( context );
 179
 180     // GTK+ always supposes that we want to copy the data by default while we
 181     // might want to move it, so examine not only suggested_action - which is
 182     // only good if we don't have our own preferences - but also the actions
 183     // field
 184     wxDragResult result;
 185     if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 186             (context->actions & GDK_ACTION_MOVE ) )
 187     {
 188         // move is requested by the program and allowed by GTK+ - do it, even
 189         // though suggested_action may be currently wxDragCopy
 190         result = wxDragMove;
 191     }
 192     else // use whatever GTK+ says we should
 193     {
 194         result = ConvertFromGTK(context->suggested_action);
 195
 196         if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 197         {
 198             // we're requested to move but we can't
 199             result = wxDragCopy;
 200         }
 201     }
 202
 203     if (drop_target->m_firstMotion)
 204     {
 205         /* the first "drag_motion" event substitutes a "drag_enter" event */
 206         result = drop_target->OnEnter( x, y, result );
 207     }
 208     else
 209     {
 210         /* give program a chance to react (i.e. to say no by returning FALSE) */
 211         result = drop_target->OnDragOver( x, y, result );
 212     }
 213
 214     bool ret = wxIsDragResultOk( result );
 215     if (ret)
 216     {
 217         GdkDragAction action;
 218         if (result == wxDragCopy)
 219             action = GDK_ACTION_COPY;
 220         else if (result == wxDragLink)
 221             action = GDK_ACTION_LINK;
 222         else
 223             action = GDK_ACTION_MOVE;
 224
 225         gdk_drag_status( context, action, time );
 226     }
 227
 228     /* after this, invalidate the drop_target's GdkDragContext */
 229     drop_target->SetDragContext( (GdkDragContext*) NULL );
 230
 231     /* this has to be done because GDK has no "drag_enter" event */
 232     drop_target->m_firstMotion = FALSE;
 233
 234     return ret;
 235 }
 236
 237 // ----------------------------------------------------------------------------
 238 // "drag_drop"
 239 // ----------------------------------------------------------------------------
 240
 241 static gboolean target_drag_drop( GtkWidget *widget,
 242                                   GdkDragContext *context,
 243                                   gint x,
 244                                   gint y,
 245                                   guint time,
 246                                   wxDropTarget *drop_target )
 247 {
 248     if (g_isIdle) wxapp_install_idle_handler();
 249
 250     /* Owen Taylor: "if the drop is not in a drop zone,
 251        return FALSE, otherwise, if you aren't accepting
 252        the drop, call gtk_drag_finish() with success == FALSE
 253        otherwise call gtk_drag_data_get()" */
 254
 255 //    printf( "drop.\n" );
 256
 257     /* this seems to make a difference between not accepting
 258        due to wrong target area and due to wrong format. let
 259        us hope that this is not required.. */
 260
 261     /* inform the wxDropTarget about the current GdkDragContext.
 262        this is only valid for the duration of this call */
 263     drop_target->SetDragContext( context );
 264
 265     /* inform the wxDropTarget about the current drag widget.
 266        this is only valid for the duration of this call */
 267     drop_target->SetDragWidget( widget );
 268
 269     /* inform the wxDropTarget about the current drag time.
 270        this is only valid for the duration of this call */
 271     drop_target->SetDragTime( time );
 272
 273 /*
 274     wxDragResult result = wxDragMove;
 275     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 276 */
 277
 278     /* reset the block here as someone might very well
 279        show a dialog as a reaction to a drop and this
 280        wouldn't work without events */
 281     g_blockEventsOnDrag = FALSE;
 282
 283     bool ret = drop_target->OnDrop( x, y );
 284
 285     if (!ret)
 286     {
 287         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 288
 289         /* cancel the whole thing */
 290         gtk_drag_finish( context,
 291                           FALSE,        /* no success */
 292                           FALSE,        /* don't delete data on dropping side */
 293                           time );
 294     }
 295     else
 296     {
 297         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned TRUE") );
 298
 299 #if wxUSE_THREADS
 300         /* disable GUI threads */
 301 #endif
 302
 303         GdkAtom format = drop_target->GetMatchingPair();
 304
 305         // this does happen somehow, see bug 555111
 306         wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") )
 307
 308 /*
 309         GdkDragAction action = GDK_ACTION_MOVE;
 310         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 311         context->action = action;
 312 */
 313         /* this should trigger an "drag_data_received" event */
 314         gtk_drag_get_data( widget,
 315                            context,
 316                            format,
 317                            time );
 318
 319 #if wxUSE_THREADS
 320         /* re-enable GUI threads */
 321 #endif
 322     }
 323
 324     /* after this, invalidate the drop_target's GdkDragContext */
 325     drop_target->SetDragContext( (GdkDragContext*) NULL );
 326
 327     /* after this, invalidate the drop_target's drag widget */
 328     drop_target->SetDragWidget( (GtkWidget*) NULL );
 329
 330     /* this has to be done because GDK has no "drag_enter" event */
 331     drop_target->m_firstMotion = TRUE;
 332
 333     return ret;
 334 }
 335
 336 // ----------------------------------------------------------------------------
 337 // "drag_data_received"
 338 // ----------------------------------------------------------------------------
 339
 340 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 341                                        GdkDragContext *context,
 342                                        gint x,
 343                                        gint y,
 344                                        GtkSelectionData *data,
 345                                        guint WXUNUSED(info),
 346                                        guint time,
 347                                        wxDropTarget *drop_target )
 348 {
 349     if (g_isIdle) wxapp_install_idle_handler();
 350
 351     /* Owen Taylor: "call gtk_drag_finish() with
 352        success == TRUE" */
 353
 354     if ((data->length <= 0) || (data->format != 8))
 355     {
 356         /* negative data length and non 8-bit data format
 357            qualifies for junk */
 358         gtk_drag_finish (context, FALSE, FALSE, time);
 359
 360         return;
 361     }
 362
 363     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 364
 365     /* inform the wxDropTarget about the current GtkSelectionData.
 366        this is only valid for the duration of this call */
 367     drop_target->SetDragData( data );
 368
 369     wxDragResult result = ConvertFromGTK(context->suggested_action);
 370
 371     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 372     {
 373         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned TRUE") );
 374
 375         /* tell GTK that data transfer was successfull */
 376         gtk_drag_finish( context, TRUE, FALSE, time );
 377     }
 378     else
 379     {
 380         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 381
 382         /* tell GTK that data transfer was not successfull */
 383         gtk_drag_finish( context, FALSE, FALSE, time );
 384     }
 385
 386     /* after this, invalidate the drop_target's drag data */
 387     drop_target->SetDragData( (GtkSelectionData*) NULL );
 388 }
 389
 390 //----------------------------------------------------------------------------
 391 // wxDropTarget
 392 //----------------------------------------------------------------------------
 393
 394 wxDropTarget::wxDropTarget( wxDataObject *data )
 395             : wxDropTargetBase( data )
 396 {
 397     m_firstMotion = TRUE;
 398     m_dragContext = (GdkDragContext*) NULL;
 399     m_dragWidget = (GtkWidget*) NULL;
 400     m_dragData = (GtkSelectionData*) NULL;
 401     m_dragTime = 0;
 402 }
 403
 404 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 405                                        wxCoord WXUNUSED(y),
 406                                        wxDragResult def )
 407 {
 408     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 409
 410     // disable the debug message from GetMatchingPair() - there are too many
 411     // of them otherwise
 412 #ifdef __WXDEBUG__
 413     wxLogNull noLog;
 414 #endif // Debug
 415
 416     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 417 }
 418
 419 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 420 {
 421     if (!m_dataObject)
 422         return FALSE;
 423
 424     return (GetMatchingPair() != (GdkAtom) 0);
 425 }
 426
 427 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 428                                    wxDragResult def )
 429 {
 430     if (!m_dataObject)
 431         return wxDragNone;
 432
 433     if (GetMatchingPair() == (GdkAtom) 0)
 434         return wxDragNone;
 435
 436     return GetData() ? def : wxDragNone;
 437 }
 438
 439 GdkAtom wxDropTarget::GetMatchingPair()
 440 {
 441     if (!m_dataObject)
 442         return (GdkAtom) 0;
 443
 444     if (!m_dragContext)
 445         return (GdkAtom) 0;
 446
 447     GList *child = m_dragContext->targets;
 448     while (child)
 449     {
 450         GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
 451         wxDataFormat format( formatAtom );
 452
 453 #ifdef __WXDEBUG__
 454         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 455                    format.GetId().c_str());
 456 #endif // Debug
 457
 458         if (m_dataObject->IsSupportedFormat( format ))
 459             return formatAtom;
 460
 461         child = child->next;
 462     }
 463
 464     return (GdkAtom) 0;
 465 }
 466
 467 bool wxDropTarget::GetData()
 468 {
 469     if (!m_dragData)
 470         return FALSE;
 471
 472     if (!m_dataObject)
 473         return FALSE;
 474
 475     wxDataFormat dragFormat( m_dragData->target );
 476
 477     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 478         return FALSE;
 479
 480     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 481
 482     return TRUE;
 483 }
 484
 485 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 486 {
 487     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 488
 489     gtk_drag_dest_unset( widget );
 490
 491     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 492                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 493
 494     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 495                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 496
 497     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 498                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 499
 500     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 501                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 502 }
 503
 504 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 505 {
 506     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 507
 508     /* gtk_drag_dest_set() determines what default behaviour we'd like
 509        GTK to supply. we don't want to specify out targets (=formats)
 510        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 511        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 512        "drag_motion" and "drag_drop" events. this makes it possible
 513        to allow dropping on only a small area. we should set
 514        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 515        highlighting if dragging over standard controls, but this
 516        seems to be broken without the other two. */
 517
 518     gtk_drag_dest_set( widget,
 519                        (GtkDestDefaults) 0,         /* no default behaviour */
 520                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 521                        0,                           /* number of targets = 0 */
 522                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 523
 524     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 525                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 526
 527     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 528                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 529
 530     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 531                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 532
 533     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 534                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 535 }
 536
 537 //----------------------------------------------------------------------------
 538 // "drag_data_get"
 539 //----------------------------------------------------------------------------
 540
 541 static void
 542 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 543                        GdkDragContext     *WXUNUSED(context),
 544                        GtkSelectionData   *selection_data,
 545                        guint               WXUNUSED(info),
 546                        guint               WXUNUSED(time),
 547                        wxDropSource       *drop_source )
 548 {
 549     if (g_isIdle) wxapp_install_idle_handler();
 550
 551     wxDataFormat format( selection_data->target );
 552
 553     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 554                format.GetId().c_str());
 555
 556     drop_source->m_retValue = wxDragCancel;
 557
 558     wxDataObject *data = drop_source->GetDataObject();
 559
 560     if (!data)
 561     {
 562         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 563         return;
 564     }
 565
 566     if (!data->IsSupportedFormat(format))
 567     {
 568         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 569         return;
 570     }
 571
 572     if (data->GetDataSize(format) == 0)
 573     {
 574         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 575         return;
 576     }
 577
 578     size_t size = data->GetDataSize(format);
 579
 580 //  printf( "data size: %d.\n", (int)data_size );
 581
 582     guchar *d = new guchar[size];
 583
 584     if (!data->GetDataHere( format, (void*)d ))
 585     {
 586         delete[] d;
 587         return;
 588     }
 589
 590 #if wxUSE_THREADS
 591     /* disable GUI threads */
 592 #endif
 593
 594                 gtk_selection_data_set( selection_data,
 595                                         selection_data->target,
 596                                         8,   // 8-bit
 597                                         d,
 598                                         size );
 599
 600 #if wxUSE_THREADS
 601     /* enable GUI threads */
 602 #endif
 603
 604     delete[] d;
 605 }
 606
 607 //----------------------------------------------------------------------------
 608 // "drag_data_delete"
 609 //----------------------------------------------------------------------------
 610
 611 static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
 612                                      GdkDragContext *context,
 613                                      wxDropSource *WXUNUSED(drop_source) )
 614 {
 615     if (g_isIdle)
 616         wxapp_install_idle_handler();
 617
 618     // printf( "Drag source: drag_data_delete\n" );
 619 }
 620
 621 //----------------------------------------------------------------------------
 622 // "drag_begin"
 623 //----------------------------------------------------------------------------
 624
 625 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 626                                GdkDragContext     *WXUNUSED(context),
 627                                wxDropSource       *WXUNUSED(drop_source) )
 628 {
 629     if (g_isIdle)
 630         wxapp_install_idle_handler();
 631
 632     // printf( "Drag source: drag_begin.\n" );
 633 }
 634
 635 //----------------------------------------------------------------------------
 636 // "drag_end"
 637 //----------------------------------------------------------------------------
 638
 639 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 640                              GdkDragContext     *WXUNUSED(context),
 641                              wxDropSource       *drop_source )
 642 {
 643     if (g_isIdle) wxapp_install_idle_handler();
 644
 645     // printf( "Drag source: drag_end.\n" );
 646
 647     drop_source->m_waiting = FALSE;
 648 }
 649
 650 //-----------------------------------------------------------------------------
 651 // "configure_event" from m_iconWindow
 652 //-----------------------------------------------------------------------------
 653
 654 static gint
 655 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 656 {
 657     if (g_isIdle)
 658         wxapp_install_idle_handler();
 659
 660     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 661
 662     return 0;
 663 }
 664
 665 //---------------------------------------------------------------------------
 666 // wxDropSource
 667 //---------------------------------------------------------------------------
 668
 669 wxDropSource::wxDropSource(wxWindow *win,
 670                            const wxIcon &iconCopy,
 671                            const wxIcon &iconMove,
 672                            const wxIcon &iconNone)
 673 {
 674     m_waiting = TRUE;
 675
 676     m_iconWindow = (GtkWidget*) NULL;
 677
 678     m_window = win;
 679     m_widget = win->m_widget;
 680     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 681
 682     m_retValue = wxDragCancel;
 683
 684     SetIcons(iconCopy, iconMove, iconNone);
 685 }
 686
 687 wxDropSource::wxDropSource(wxDataObject& data,
 688                            wxWindow *win,
 689                            const wxIcon &iconCopy,
 690                            const wxIcon &iconMove,
 691                            const wxIcon &iconNone)
 692 {
 693     m_waiting = TRUE;
 694
 695     SetData( data );
 696
 697     m_iconWindow = (GtkWidget*) NULL;
 698
 699     m_window = win;
 700     m_widget = win->m_widget;
 701     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 702
 703     m_retValue = wxDragCancel;
 704
 705     SetIcons(iconCopy, iconMove, iconNone);
 706 }
 707
 708 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 709                             const wxIcon &iconMove,
 710                             const wxIcon &iconNone)
 711 {
 712     m_iconCopy = iconCopy;
 713     m_iconMove = iconMove;
 714     m_iconNone = iconNone;
 715
 716     if ( !m_iconCopy.Ok() )
 717         m_iconCopy = wxIcon(page_xpm);
 718     if ( !m_iconMove.Ok() )
 719         m_iconMove = m_iconCopy;
 720     if ( !m_iconNone.Ok() )
 721         m_iconNone = m_iconCopy;
 722 }
 723
 724 wxDropSource::~wxDropSource()
 725 {
 726 }
 727
 728 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 729 {
 730     // get the right icon to display
 731     wxIcon *icon = NULL;
 732     if ( action & GDK_ACTION_MOVE )
 733         icon = &m_iconMove;
 734     else if ( action & GDK_ACTION_COPY )
 735         icon = &m_iconCopy;
 736     else
 737         icon = &m_iconNone;
 738
 739     GdkBitmap *mask;
 740     if ( icon->GetMask() )
 741         mask = icon->GetMask()->GetBitmap();
 742     else
 743         mask = (GdkBitmap *)NULL;
 744
 745     GdkPixmap *pixmap = icon->GetPixmap();
 746
 747     gint width,height;
 748     gdk_window_get_size (pixmap, &width, &height);
 749
 750     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 751 #ifndef __WXGTK20__
 752     gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
 753 #endif
 754     gtk_widget_push_colormap (colormap);
 755
 756     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 757     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 758     gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
 759
 760 #ifndef __WXGTK20__
 761     gtk_widget_pop_visual ();
 762 #endif
 763     gtk_widget_pop_colormap ();
 764
 765     gtk_widget_set_usize (m_iconWindow, width, height);
 766     gtk_widget_realize (m_iconWindow);
 767
 768     gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
 769         GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
 770
 771     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 772
 773     if (mask)
 774         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 775
 776     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 777 }
 778
 779 wxDragResult wxDropSource::DoDragDrop(int flags)
 780 {
 781     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 782                  wxT("Drop source: no data") );
 783
 784     // still in drag
 785     if (g_blockEventsOnDrag)
 786         return wxDragNone;
 787
 788     // disabled for now
 789     g_blockEventsOnDrag = TRUE;
 790
 791     RegisterWindow();
 792
 793     m_waiting = TRUE;
 794
 795     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 796
 797     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 798     m_data->GetAllFormats( array );
 799     size_t count = m_data->GetFormatCount();
 800     for (size_t i = 0; i < count; i++)
 801     {
 802         GdkAtom atom = array[i];
 803         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 804         gtk_target_list_add( target_list, atom, 0, 0 );
 805     }
 806     delete[] array;
 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 = (guint32)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 #if wxUSE_THREADS
 826     /* disable GUI threads */
 827 #endif
 828
 829     /* don't start dragging if no button is down */
 830     if (button_number)
 831     {
 832         int action = GDK_ACTION_COPY;
 833         if ( flags & wxDrag_AllowMove )
 834             action |= GDK_ACTION_MOVE;
 835
 836         // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 837         //     to use a global to pass the flags to the drop target but I'd
 838         //     surely prefer a better way to do it
 839         gs_flagsForDrag = flags;
 840
 841         GdkDragContext *context = gtk_drag_begin( m_widget,
 842                 target_list,
 843                 (GdkDragAction)action,
 844                 button_number,  /* number of mouse button which started drag */
 845                 (GdkEvent*) &event );
 846
 847         m_dragContext = context;
 848
 849         PrepareIcon( action, context );
 850
 851         while (m_waiting)
 852             gtk_main_iteration();
 853
 854         m_retValue = ConvertFromGTK(context->action);
 855         if ( m_retValue == wxDragNone )
 856             m_retValue = wxDragCancel;
 857     }
 858
 859 #if wxUSE_THREADS
 860     /* re-enable GUI threads */
 861 #endif
 862
 863     g_blockEventsOnDrag = FALSE;
 864
 865     UnregisterWindow();
 866
 867     return m_retValue;
 868 }
 869
 870 void wxDropSource::RegisterWindow()
 871 {
 872     if (!m_widget) return;
 873
 874     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 875                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 876     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 877                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 878     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 879                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 880     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 881                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 882
 883 }
 884
 885 void wxDropSource::UnregisterWindow()
 886 {
 887     if (!m_widget) return;
 888
 889     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 890                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 891     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 892                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 893     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 894                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 895     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 896                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 897 }
 898
 899 #endif
 900       // wxUSE_DRAG_AND_DROP