src/gtk/dnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk/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 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #if wxUSE_DRAG_AND_DROP
  14
  15 #include "wx/dnd.h"
  16
  17 #ifndef WX_PRECOMP
  18     #include "wx/intl.h"
  19     #include "wx/log.h"
  20     #include "wx/app.h"
  21     #include "wx/utils.h"
  22     #include "wx/window.h"
  23     #include "wx/gdicmn.h"
  24 #endif
  25
  26 #include "wx/scopeguard.h"
  27
  28 #include <gtk/gtk.h>
  29
  30 //----------------------------------------------------------------------------
  31 // global data
  32 //----------------------------------------------------------------------------
  33
  34 extern bool g_blockEventsOnDrag;
  35
  36 // the flags used for the last DoDragDrop()
  37 static long gs_flagsForDrag = 0;
  38
  39 #ifdef __WXDEBUG__
  40 // the trace mask we use with wxLogTrace() - call
  41 // wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
  42 // (there are quite a few of them, so don't enable this by default)
  43 static const wxChar *TRACE_DND = _T("dnd");
  44 #endif
  45
  46 // global variables because GTK+ DnD want to have the
  47 // mouse event that caused it
  48 extern GdkEvent *g_lastMouseEvent;
  49 extern int       g_lastButtonNumber;
  50
  51 //----------------------------------------------------------------------------
  52 // standard icons
  53 //----------------------------------------------------------------------------
  54
  55 /* Copyright (c) Julian Smart */
  56 static const char * page_xpm[] = {
  57 /* columns rows colors chars-per-pixel */
  58 "32 32 37 1",
  59 "5 c #7198D9",
  60 ", c #769CDA",
  61 "2 c #DCE6F6",
  62 "i c #FFFFFF",
  63 "e c #779DDB",
  64 ": c #9AB6E4",
  65 "9 c #EAF0FA",
  66 "- c #B1C7EB",
  67 "$ c #6992D7",
  68 "y c #F7F9FD",
  69 "= c #BED0EE",
  70 "q c #F0F5FC",
  71 "; c #A8C0E8",
  72 "@ c #366BC2",
  73 "  c None",
  74 "u c #FDFEFF",
  75 "8 c #5987D3",
  76 "* c #C4D5F0",
  77 "7 c #7CA0DC",
  78 "O c #487BCE",
  79 "< c #6B94D7",
  80 "& c #CCDAF2",
  81 "> c #89A9DF",
  82 "3 c #5584D1",
  83 "w c #82A5DE",
  84 "1 c #3F74CB",
  85 "+ c #3A70CA",
  86 ". c #3569BF",
  87 "% c #D2DFF4",
  88 "# c #3366BB",
  89 "r c #F5F8FD",
  90 "0 c #FAFCFE",
  91 "4 c #DFE8F7",
  92 "X c #5E8AD4",
  93 "o c #5282D0",
  94 "t c #B8CCEC",
  95 "6 c #E5EDF9",
  96 /* pixels */
  97 "                                ",
  98 "                                ",
  99 "                                ",
 100 "                                ",
 101 "                                ",
 102 "       .XXXooOO++@#             ",
 103 "       $%&*=-;::>,<1            ",
 104 "       $2%&*=-;::><:3           ",
 105 "       $42%&*=-;::<&:3          ",
 106 "       56477<<<<8<<9&:X         ",
 107 "       59642%&*=-;<09&:5        ",
 108 "       5q9642%&*=-<<<<<#        ",
 109 "       5qqw777<<<<<88:>+        ",
 110 "       erqq9642%&*=t;::+        ",
 111 "       eyrqq9642%&*=t;:O        ",
 112 "       eyywwww777<<<<t;O        ",
 113 "       e0yyrqq9642%&*=to        ",
 114 "       e00yyrqq9642%&*=o        ",
 115 "       eu0wwwwwww777<&*X        ",
 116 "       euu00yyrqq9642%&X        ",
 117 "       eiuu00yyrqq9642%X        ",
 118 "       eiiwwwwwwwwww742$        ",
 119 "       eiiiuu00yyrqq964$        ",
 120 "       eiiiiuu00yyrqq96$        ",
 121 "       eiiiiiuu00yyrqq95        ",
 122 "       eiiiiiiuu00yyrqq5        ",
 123 "       eeeeeeeeeeeeee55e        ",
 124 "                                ",
 125 "                                ",
 126 "                                ",
 127 "                                ",
 128 "                                "
 129 };
 130
 131
 132 // ============================================================================
 133 // private functions
 134 // ============================================================================
 135
 136 // ----------------------------------------------------------------------------
 137 // convert between GTK+ and wxWidgets DND constants
 138 // ----------------------------------------------------------------------------
 139
 140 static wxDragResult ConvertFromGTK(long action)
 141 {
 142     switch ( action )
 143     {
 144         case GDK_ACTION_COPY:
 145             return wxDragCopy;
 146
 147         case GDK_ACTION_LINK:
 148             return wxDragLink;
 149
 150         case GDK_ACTION_MOVE:
 151             return wxDragMove;
 152     }
 153
 154     return wxDragNone;
 155 }
 156
 157 // ----------------------------------------------------------------------------
 158 // "drag_leave"
 159 // ----------------------------------------------------------------------------
 160
 161 extern "C" {
 162 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 163                                GdkDragContext *context,
 164                                guint WXUNUSED(time),
 165                                wxDropTarget *drop_target )
 166 {
 167     /* inform the wxDropTarget about the current GdkDragContext.
 168        this is only valid for the duration of this call */
 169     drop_target->SetDragContext( context );
 170
 171     /* we don't need return values. this event is just for
 172        information */
 173     drop_target->OnLeave();
 174
 175     /* this has to be done because GDK has no "drag_enter" event */
 176     drop_target->m_firstMotion = true;
 177
 178     /* after this, invalidate the drop_target's GdkDragContext */
 179     drop_target->SetDragContext( (GdkDragContext*) NULL );
 180 }
 181 }
 182
 183 // ----------------------------------------------------------------------------
 184 // "drag_motion"
 185 // ----------------------------------------------------------------------------
 186
 187 extern "C" {
 188 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 189                                     GdkDragContext *context,
 190                                     gint x,
 191                                     gint y,
 192                                     guint time,
 193                                     wxDropTarget *drop_target )
 194 {
 195     /* Owen Taylor: "if the coordinates not in a drop zone,
 196        return FALSE, otherwise call gtk_drag_status() and
 197        return TRUE" */
 198
 199     /* inform the wxDropTarget about the current GdkDragContext.
 200        this is only valid for the duration of this call */
 201     drop_target->SetDragContext( context );
 202
 203     // GTK+ always supposes that we want to copy the data by default while we
 204     // might want to move it, so examine not only suggested_action - which is
 205     // only good if we don't have our own preferences - but also the actions
 206     // field
 207     wxDragResult result;
 208     if (drop_target->GetDefaultAction() == wxDragNone)
 209     {
 210         // use default action set by wxDropSource::DoDragDrop()
 211     if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 212             (context->actions & GDK_ACTION_MOVE ) )
 213     {
 214         // move is requested by the program and allowed by GTK+ - do it, even
 215         // though suggested_action may be currently wxDragCopy
 216         result = wxDragMove;
 217     }
 218     else // use whatever GTK+ says we should
 219     {
 220         result = ConvertFromGTK(context->suggested_action);
 221
 222         if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 223         {
 224             // we're requested to move but we can't
 225             result = wxDragCopy;
 226         }
 227     }
 228     }
 229     else if (drop_target->GetDefaultAction() == wxDragMove &&
 230                 (context->actions & GDK_ACTION_MOVE))
 231     {
 232        result = wxDragMove;
 233     }
 234     else
 235     {
 236         if (context->actions & GDK_ACTION_COPY)
 237             result = wxDragCopy;
 238         else if (context->actions & GDK_ACTION_MOVE)
 239             result = wxDragMove;
 240         else
 241             result = wxDragNone;
 242     }
 243
 244     if (drop_target->m_firstMotion)
 245     {
 246         /* the first "drag_motion" event substitutes a "drag_enter" event */
 247         result = drop_target->OnEnter( x, y, result );
 248     }
 249     else
 250     {
 251         /* give program a chance to react (i.e. to say no by returning FALSE) */
 252         result = drop_target->OnDragOver( x, y, result );
 253     }
 254
 255     bool ret = wxIsDragResultOk( result );
 256     if (ret)
 257     {
 258         GdkDragAction action;
 259         if (result == wxDragCopy)
 260             action = GDK_ACTION_COPY;
 261         else if (result == wxDragLink)
 262             action = GDK_ACTION_LINK;
 263         else
 264             action = GDK_ACTION_MOVE;
 265
 266         gdk_drag_status( context, action, time );
 267     }
 268
 269     /* after this, invalidate the drop_target's GdkDragContext */
 270     drop_target->SetDragContext( (GdkDragContext*) NULL );
 271
 272     /* this has to be done because GDK has no "drag_enter" event */
 273     drop_target->m_firstMotion = false;
 274
 275     return ret;
 276 }
 277 }
 278
 279 // ----------------------------------------------------------------------------
 280 // "drag_drop"
 281 // ----------------------------------------------------------------------------
 282
 283 extern "C" {
 284 static gboolean target_drag_drop( GtkWidget *widget,
 285                                   GdkDragContext *context,
 286                                   gint x,
 287                                   gint y,
 288                                   guint time,
 289                                   wxDropTarget *drop_target )
 290 {
 291     /* Owen Taylor: "if the drop is not in a drop zone,
 292        return FALSE, otherwise, if you aren't accepting
 293        the drop, call gtk_drag_finish() with success == FALSE
 294        otherwise call gtk_drag_data_get()" */
 295
 296 //    printf( "drop.\n" );
 297
 298     /* this seems to make a difference between not accepting
 299        due to wrong target area and due to wrong format. let
 300        us hope that this is not required.. */
 301
 302     /* inform the wxDropTarget about the current GdkDragContext.
 303        this is only valid for the duration of this call */
 304     drop_target->SetDragContext( context );
 305
 306     /* inform the wxDropTarget about the current drag widget.
 307        this is only valid for the duration of this call */
 308     drop_target->SetDragWidget( widget );
 309
 310     /* inform the wxDropTarget about the current drag time.
 311        this is only valid for the duration of this call */
 312     drop_target->SetDragTime( time );
 313
 314 /*
 315     wxDragResult result = wxDragMove;
 316     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 317 */
 318
 319     /* reset the block here as someone might very well
 320        show a dialog as a reaction to a drop and this
 321        wouldn't work without events */
 322     g_blockEventsOnDrag = false;
 323
 324     bool ret = drop_target->OnDrop( x, y );
 325
 326     if (!ret)
 327     {
 328 #ifdef __WXDEBUG__
 329         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 330 #endif
 331
 332         /* cancel the whole thing */
 333         gtk_drag_finish( context,
 334                           FALSE,        /* no success */
 335                           FALSE,        /* don't delete data on dropping side */
 336                           time );
 337     }
 338     else
 339     {
 340 #ifdef __WXDEBUG__
 341         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned true") );
 342 #endif
 343
 344 #if wxUSE_THREADS
 345         /* disable GUI threads */
 346 #endif
 347
 348         GdkAtom format = drop_target->GetMatchingPair();
 349
 350         // this does happen somehow, see bug 555111
 351         wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") );
 352
 353 /*
 354         GdkDragAction action = GDK_ACTION_MOVE;
 355         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 356         context->action = action;
 357 */
 358         /* this should trigger an "drag_data_received" event */
 359         gtk_drag_get_data( widget,
 360                            context,
 361                            format,
 362                            time );
 363
 364 #if wxUSE_THREADS
 365         /* re-enable GUI threads */
 366 #endif
 367     }
 368
 369     /* after this, invalidate the drop_target's GdkDragContext */
 370     drop_target->SetDragContext( (GdkDragContext*) NULL );
 371
 372     /* after this, invalidate the drop_target's drag widget */
 373     drop_target->SetDragWidget( (GtkWidget*) NULL );
 374
 375     /* this has to be done because GDK has no "drag_enter" event */
 376     drop_target->m_firstMotion = true;
 377
 378     return ret;
 379 }
 380 }
 381
 382 // ----------------------------------------------------------------------------
 383 // "drag_data_received"
 384 // ----------------------------------------------------------------------------
 385
 386 extern "C" {
 387 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 388                                        GdkDragContext *context,
 389                                        gint x,
 390                                        gint y,
 391                                        GtkSelectionData *data,
 392                                        guint WXUNUSED(info),
 393                                        guint time,
 394                                        wxDropTarget *drop_target )
 395 {
 396     /* Owen Taylor: "call gtk_drag_finish() with
 397        success == TRUE" */
 398
 399     if ((data->length <= 0) || (data->format != 8))
 400     {
 401         /* negative data length and non 8-bit data format
 402            qualifies for junk */
 403         gtk_drag_finish (context, FALSE, FALSE, time);
 404
 405         return;
 406     }
 407
 408 #ifdef __WXDEBUG__
 409     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 410 #endif
 411
 412     /* inform the wxDropTarget about the current GtkSelectionData.
 413        this is only valid for the duration of this call */
 414     drop_target->SetDragData( data );
 415
 416     wxDragResult result = ConvertFromGTK(context->action);
 417
 418     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 419     {
 420 #ifdef __WXDEBUG__
 421         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned true") );
 422 #endif
 423
 424         /* tell GTK that data transfer was successful */
 425         gtk_drag_finish( context, TRUE, FALSE, time );
 426     }
 427     else
 428     {
 429 #ifdef __WXDEBUG__
 430         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 431 #endif
 432
 433         /* tell GTK that data transfer was not successful */
 434         gtk_drag_finish( context, FALSE, FALSE, time );
 435     }
 436
 437     /* after this, invalidate the drop_target's drag data */
 438     drop_target->SetDragData( (GtkSelectionData*) NULL );
 439 }
 440 }
 441
 442 //----------------------------------------------------------------------------
 443 // wxDropTarget
 444 //----------------------------------------------------------------------------
 445
 446 wxDropTarget::wxDropTarget( wxDataObject *data )
 447             : wxDropTargetBase( data )
 448 {
 449     m_firstMotion = true;
 450     m_dragContext = (GdkDragContext*) NULL;
 451     m_dragWidget = (GtkWidget*) NULL;
 452     m_dragData = (GtkSelectionData*) NULL;
 453     m_dragTime = 0;
 454 }
 455
 456 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 457                                        wxCoord WXUNUSED(y),
 458                                        wxDragResult def )
 459 {
 460     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 461
 462     // disable the debug message from GetMatchingPair() - there are too many
 463     // of them otherwise
 464 #ifdef __WXDEBUG__
 465     wxLogNull noLog;
 466 #endif // Debug
 467
 468     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 469 }
 470
 471 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 472 {
 473     if (!m_dataObject)
 474         return false;
 475
 476     return (GetMatchingPair() != (GdkAtom) 0);
 477 }
 478
 479 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 480                                    wxDragResult def )
 481 {
 482     if (!m_dataObject)
 483         return wxDragNone;
 484
 485     if (GetMatchingPair() == (GdkAtom) 0)
 486         return wxDragNone;
 487
 488     return GetData() ? def : wxDragNone;
 489 }
 490
 491 GdkAtom wxDropTarget::GetMatchingPair()
 492 {
 493     if (!m_dataObject)
 494         return (GdkAtom) 0;
 495
 496     if (!m_dragContext)
 497         return (GdkAtom) 0;
 498
 499     GList *child = m_dragContext->targets;
 500     while (child)
 501     {
 502         GdkAtom formatAtom = (GdkAtom)(child->data);
 503         wxDataFormat format( formatAtom );
 504
 505 #ifdef __WXDEBUG__
 506         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 507                    format.GetId().c_str());
 508 #endif // Debug
 509
 510         if (m_dataObject->IsSupportedFormat( format ))
 511             return formatAtom;
 512
 513         child = child->next;
 514     }
 515
 516     return (GdkAtom) 0;
 517 }
 518
 519 bool wxDropTarget::GetData()
 520 {
 521     if (!m_dragData)
 522         return false;
 523
 524     if (!m_dataObject)
 525         return false;
 526
 527     wxDataFormat dragFormat( m_dragData->target );
 528
 529     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 530         return false;
 531
 532     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 533
 534     return true;
 535 }
 536
 537 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 538 {
 539     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 540
 541     gtk_drag_dest_unset( widget );
 542
 543     g_signal_handlers_disconnect_by_func (widget,
 544                                           (gpointer) target_drag_leave, this);
 545     g_signal_handlers_disconnect_by_func (widget,
 546                                           (gpointer) target_drag_motion, this);
 547     g_signal_handlers_disconnect_by_func (widget,
 548                                           (gpointer) target_drag_drop, this);
 549     g_signal_handlers_disconnect_by_func (widget,
 550                                           (gpointer) target_drag_data_received, this);
 551 }
 552
 553 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 554 {
 555     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 556
 557     /* gtk_drag_dest_set() determines what default behaviour we'd like
 558        GTK to supply. we don't want to specify out targets (=formats)
 559        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 560        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 561        "drag_motion" and "drag_drop" events. this makes it possible
 562        to allow dropping on only a small area. we should set
 563        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 564        highlighting if dragging over standard controls, but this
 565        seems to be broken without the other two. */
 566
 567     gtk_drag_dest_set( widget,
 568                        (GtkDestDefaults) 0,         /* no default behaviour */
 569                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 570                        0,                           /* number of targets = 0 */
 571                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 572
 573     g_signal_connect (widget, "drag_leave",
 574                       G_CALLBACK (target_drag_leave), this);
 575
 576     g_signal_connect (widget, "drag_motion",
 577                       G_CALLBACK (target_drag_motion), this);
 578
 579     g_signal_connect (widget, "drag_drop",
 580                       G_CALLBACK (target_drag_drop), this);
 581
 582     g_signal_connect (widget, "drag_data_received",
 583                       G_CALLBACK (target_drag_data_received), this);
 584 }
 585
 586 //----------------------------------------------------------------------------
 587 // "drag_data_get"
 588 //----------------------------------------------------------------------------
 589
 590 extern "C" {
 591 static void
 592 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 593                        GdkDragContext     *WXUNUSED(context),
 594                        GtkSelectionData   *selection_data,
 595                        guint               WXUNUSED(info),
 596                        guint               WXUNUSED(time),
 597                        wxDropSource       *drop_source )
 598 {
 599     wxDataFormat format( selection_data->target );
 600
 601 #ifdef __WXDEBUG__
 602     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 603                format.GetId().c_str());
 604 #endif
 605
 606     drop_source->m_retValue = wxDragCancel;
 607
 608     wxDataObject *data = drop_source->GetDataObject();
 609
 610     if (!data)
 611     {
 612 #ifdef __WXDEBUG__
 613         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 614 #endif
 615        return;
 616     }
 617
 618     if (!data->IsSupportedFormat(format))
 619     {
 620 #ifdef __WXDEBUG__
 621         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 622 #endif
 623        return;
 624     }
 625
 626     if (data->GetDataSize(format) == 0)
 627     {
 628 #ifdef __WXDEBUG__
 629         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 630 #endif
 631        return;
 632     }
 633
 634     size_t size = data->GetDataSize(format);
 635
 636 //  printf( "data size: %d.\n", (int)data_size );
 637
 638     guchar *d = new guchar[size];
 639
 640     if (!data->GetDataHere( format, (void*)d ))
 641     {
 642         delete[] d;
 643         return;
 644     }
 645
 646 #if wxUSE_THREADS
 647     /* disable GUI threads */
 648 #endif
 649
 650     gtk_selection_data_set( selection_data,
 651                             selection_data->target,
 652                             8,   // 8-bit
 653                             d,
 654                             size );
 655
 656 #if wxUSE_THREADS
 657     /* enable GUI threads */
 658 #endif
 659
 660     delete[] d;
 661 }
 662 }
 663
 664 //----------------------------------------------------------------------------
 665 // "drag_end"
 666 //----------------------------------------------------------------------------
 667
 668 extern "C" {
 669 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 670                              GdkDragContext     *WXUNUSED(context),
 671                              wxDropSource       *drop_source )
 672 {
 673     // printf( "Drag source: drag_end.\n" );
 674
 675     drop_source->m_waiting = false;
 676 }
 677 }
 678
 679 //-----------------------------------------------------------------------------
 680 // "configure_event" from m_iconWindow
 681 //-----------------------------------------------------------------------------
 682
 683 extern "C" {
 684 static gint
 685 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 686 {
 687     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 688
 689     return 0;
 690 }
 691 }
 692
 693 //---------------------------------------------------------------------------
 694 // wxDropSource
 695 //---------------------------------------------------------------------------
 696
 697 wxDropSource::wxDropSource(wxWindow *win,
 698                            const wxIcon &iconCopy,
 699                            const wxIcon &iconMove,
 700                            const wxIcon &iconNone)
 701 {
 702     m_waiting = true;
 703
 704     m_iconWindow = (GtkWidget*) NULL;
 705
 706     m_window = win;
 707     m_widget = win->m_widget;
 708     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 709
 710     m_retValue = wxDragCancel;
 711
 712     SetIcons(iconCopy, iconMove, iconNone);
 713 }
 714
 715 wxDropSource::wxDropSource(wxDataObject& data,
 716                            wxWindow *win,
 717                            const wxIcon &iconCopy,
 718                            const wxIcon &iconMove,
 719                            const wxIcon &iconNone)
 720 {
 721     m_waiting = true;
 722
 723     SetData( data );
 724
 725     m_iconWindow = (GtkWidget*) NULL;
 726
 727     m_window = win;
 728     m_widget = win->m_widget;
 729     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 730
 731     m_retValue = wxDragCancel;
 732
 733     SetIcons(iconCopy, iconMove, iconNone);
 734 }
 735
 736 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 737                             const wxIcon &iconMove,
 738                             const wxIcon &iconNone)
 739 {
 740     m_iconCopy = iconCopy;
 741     m_iconMove = iconMove;
 742     m_iconNone = iconNone;
 743
 744     if ( !m_iconCopy.Ok() )
 745         m_iconCopy = wxIcon(page_xpm);
 746     if ( !m_iconMove.Ok() )
 747         m_iconMove = m_iconCopy;
 748     if ( !m_iconNone.Ok() )
 749         m_iconNone = m_iconCopy;
 750 }
 751
 752 wxDropSource::~wxDropSource()
 753 {
 754 }
 755
 756 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 757 {
 758     // get the right icon to display
 759     wxIcon *icon = NULL;
 760     if ( action & GDK_ACTION_MOVE )
 761         icon = &m_iconMove;
 762     else if ( action & GDK_ACTION_COPY )
 763         icon = &m_iconCopy;
 764     else
 765         icon = &m_iconNone;
 766
 767     GdkBitmap *mask;
 768     if ( icon->GetMask() )
 769         mask = icon->GetMask()->GetBitmap();
 770     else
 771         mask = (GdkBitmap *)NULL;
 772
 773     GdkPixmap *pixmap = icon->GetPixmap();
 774
 775     gint width,height;
 776     gdk_drawable_get_size (pixmap, &width, &height);
 777
 778     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 779     gtk_widget_push_colormap (colormap);
 780
 781     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 782     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 783     gtk_widget_set_app_paintable (m_iconWindow, TRUE);
 784
 785     gtk_widget_pop_colormap ();
 786
 787     gtk_widget_set_size_request (m_iconWindow, width, height);
 788     gtk_widget_realize (m_iconWindow);
 789
 790     g_signal_connect (m_iconWindow, "configure_event",
 791                       G_CALLBACK (gtk_dnd_window_configure_callback), this);
 792
 793     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 794
 795     if (mask)
 796         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 797
 798     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 799 }
 800
 801 wxDragResult wxDropSource::DoDragDrop(int flags)
 802 {
 803     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 804                  wxT("Drop source: no data") );
 805
 806     // still in drag
 807     if (g_blockEventsOnDrag)
 808         return wxDragNone;
 809
 810     // don't start dragging if no button is down
 811     if (g_lastButtonNumber == 0)
 812         return wxDragNone;
 813
 814     // we can only start a drag after a mouse event
 815     if (g_lastMouseEvent == NULL)
 816         return wxDragNone;
 817
 818     GTKConnectDragSignals();
 819     wxON_BLOCK_EXIT_OBJ0(*this, wxDropSource::GTKDisconnectDragSignals);
 820
 821     m_waiting = true;
 822
 823     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 824
 825     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 826     m_data->GetAllFormats( array );
 827     size_t count = m_data->GetFormatCount();
 828     for (size_t i = 0; i < count; i++)
 829     {
 830         GdkAtom atom = array[i];
 831 #ifdef __WXDEBUG__
 832         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 833 #endif
 834        gtk_target_list_add( target_list, atom, 0, 0 );
 835     }
 836     delete[] array;
 837
 838     int action = GDK_ACTION_COPY;
 839     if ( flags & wxDrag_AllowMove )
 840         action |= GDK_ACTION_MOVE;
 841
 842     // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 843     //     to use a global to pass the flags to the drop target but I'd
 844     //     surely prefer a better way to do it
 845     gs_flagsForDrag = flags;
 846
 847     GdkDragContext *context = gtk_drag_begin( m_widget,
 848                 target_list,
 849                 (GdkDragAction)action,
 850                 g_lastButtonNumber,  // number of mouse button which started drag
 851                 (GdkEvent*) g_lastMouseEvent );
 852
 853     if ( !context )
 854     {
 855         // this can happen e.g. if gdk_pointer_grab() failed
 856         return wxDragError;
 857     }
 858
 859     m_dragContext = context;
 860
 861     PrepareIcon( action, context );
 862
 863     while (m_waiting)
 864         gtk_main_iteration();
 865
 866     m_retValue = ConvertFromGTK(context->action);
 867     if ( m_retValue == wxDragNone )
 868          m_retValue = wxDragCancel;
 869
 870     return m_retValue;
 871 }
 872
 873 void wxDropSource::GTKConnectDragSignals()
 874 {
 875     if (!m_widget)
 876         return;
 877
 878     g_blockEventsOnDrag = true;
 879
 880     g_signal_connect (m_widget, "drag_data_get",
 881                       G_CALLBACK (source_drag_data_get), this);
 882     g_signal_connect (m_widget, "drag_end",
 883                       G_CALLBACK (source_drag_end), this);
 884
 885 }
 886
 887 void wxDropSource::GTKDisconnectDragSignals()
 888 {
 889     if (!m_widget)
 890         return;
 891
 892     g_blockEventsOnDrag = false;
 893
 894     g_signal_handlers_disconnect_by_func (m_widget,
 895                                           (gpointer) source_drag_data_get,
 896                                           this);
 897     g_signal_handlers_disconnect_by_func (m_widget,
 898                                           (gpointer) source_drag_end,
 899                                           this);
 900 }
 901
 902 #endif
 903       // wxUSE_DRAG_AND_DROP