src/gtk1/dnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk1/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/gtk1/private.h"
  27
  28 #include <gdk/gdkprivate.h>
  29
  30 #include <gtk/gtkdnd.h>
  31 #include <gtk/gtkselection.h>
  32
  33 //-----------------------------------------------------------------------------
  34 // idle system
  35 //-----------------------------------------------------------------------------
  36
  37 extern void wxapp_install_idle_handler();
  38 extern bool g_isIdle;
  39
  40 //-----------------------------------------------------------------------------
  41 // thread system
  42 //-----------------------------------------------------------------------------
  43
  44 #if wxUSE_THREADS
  45 #endif
  46
  47 //----------------------------------------------------------------------------
  48 // global data
  49 //----------------------------------------------------------------------------
  50
  51 extern bool g_blockEventsOnDrag;
  52
  53 // the flags used for the last DoDragDrop()
  54 static long gs_flagsForDrag = 0;
  55
  56 // the trace mask we use with wxLogTrace() - call
  57 // wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
  58 // (there are quite a few of them, so don't enable this by default)
  59 static const wxChar *TRACE_DND = _T("dnd");
  60
  61 extern GdkEvent *g_lastMouseEvent;
  62
  63 extern int g_lastButtonNumber;
  64
  65 //----------------------------------------------------------------------------
  66 // standard icons
  67 //----------------------------------------------------------------------------
  68
  69 /* Copyright (c) Julian Smart */
  70 static const char * page_xpm[] = {
  71 /* columns rows colors chars-per-pixel */
  72 "32 32 37 1",
  73 "5 c #7198D9",
  74 ", c #769CDA",
  75 "2 c #DCE6F6",
  76 "i c #FFFFFF",
  77 "e c #779DDB",
  78 ": c #9AB6E4",
  79 "9 c #EAF0FA",
  80 "- c #B1C7EB",
  81 "$ c #6992D7",
  82 "y c #F7F9FD",
  83 "= c #BED0EE",
  84 "q c #F0F5FC",
  85 "; c #A8C0E8",
  86 "@ c #366BC2",
  87 "  c None",
  88 "u c #FDFEFF",
  89 "8 c #5987D3",
  90 "* c #C4D5F0",
  91 "7 c #7CA0DC",
  92 "O c #487BCE",
  93 "< c #6B94D7",
  94 "& c #CCDAF2",
  95 "> c #89A9DF",
  96 "3 c #5584D1",
  97 "w c #82A5DE",
  98 "1 c #3F74CB",
  99 "+ c #3A70CA",
 100 ". c #3569BF",
 101 "% c #D2DFF4",
 102 "# c #3366BB",
 103 "r c #F5F8FD",
 104 "0 c #FAFCFE",
 105 "4 c #DFE8F7",
 106 "X c #5E8AD4",
 107 "o c #5282D0",
 108 "t c #B8CCEC",
 109 "6 c #E5EDF9",
 110 /* pixels */
 111 "                                ",
 112 "                                ",
 113 "                                ",
 114 "                                ",
 115 "                                ",
 116 "       .XXXooOO++@#             ",
 117 "       $%&*=-;::>,<1            ",
 118 "       $2%&*=-;::><:3           ",
 119 "       $42%&*=-;::<&:3          ",
 120 "       56477<<<<8<<9&:X         ",
 121 "       59642%&*=-;<09&:5        ",
 122 "       5q9642%&*=-<<<<<#        ",
 123 "       5qqw777<<<<<88:>+        ",
 124 "       erqq9642%&*=t;::+        ",
 125 "       eyrqq9642%&*=t;:O        ",
 126 "       eyywwww777<<<<t;O        ",
 127 "       e0yyrqq9642%&*=to        ",
 128 "       e00yyrqq9642%&*=o        ",
 129 "       eu0wwwwwww777<&*X        ",
 130 "       euu00yyrqq9642%&X        ",
 131 "       eiuu00yyrqq9642%X        ",
 132 "       eiiwwwwwwwwww742$        ",
 133 "       eiiiuu00yyrqq964$        ",
 134 "       eiiiiuu00yyrqq96$        ",
 135 "       eiiiiiuu00yyrqq95        ",
 136 "       eiiiiiiuu00yyrqq5        ",
 137 "       eeeeeeeeeeeeee55e        ",
 138 "                                ",
 139 "                                ",
 140 "                                ",
 141 "                                ",
 142 "                                "
 143 };
 144
 145
 146 // ============================================================================
 147 // private functions
 148 // ============================================================================
 149
 150 // ----------------------------------------------------------------------------
 151 // convert between GTK+ and wxWidgets DND constants
 152 // ----------------------------------------------------------------------------
 153
 154 static wxDragResult ConvertFromGTK(long action)
 155 {
 156     switch ( action )
 157     {
 158         case GDK_ACTION_COPY:
 159             return wxDragCopy;
 160
 161         case GDK_ACTION_LINK:
 162             return wxDragLink;
 163
 164         case GDK_ACTION_MOVE:
 165             return wxDragMove;
 166     }
 167
 168     return wxDragNone;
 169 }
 170
 171 // ----------------------------------------------------------------------------
 172 // "drag_leave"
 173 // ----------------------------------------------------------------------------
 174
 175 extern "C" {
 176 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 177                                GdkDragContext *context,
 178                                guint WXUNUSED(time),
 179                                wxDropTarget *drop_target )
 180 {
 181     if (g_isIdle) wxapp_install_idle_handler();
 182
 183     /* inform the wxDropTarget about the current GdkDragContext.
 184        this is only valid for the duration of this call */
 185     drop_target->SetDragContext( context );
 186
 187     /* we don't need return values. this event is just for
 188        information */
 189     drop_target->OnLeave();
 190
 191     /* this has to be done because GDK has no "drag_enter" event */
 192     drop_target->m_firstMotion = true;
 193
 194     /* after this, invalidate the drop_target's GdkDragContext */
 195     drop_target->SetDragContext( (GdkDragContext*) NULL );
 196 }
 197 }
 198
 199 // ----------------------------------------------------------------------------
 200 // "drag_motion"
 201 // ----------------------------------------------------------------------------
 202
 203 extern "C" {
 204 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 205                                     GdkDragContext *context,
 206                                     gint x,
 207                                     gint y,
 208                                     guint time,
 209                                     wxDropTarget *drop_target )
 210 {
 211     if (g_isIdle) wxapp_install_idle_handler();
 212
 213     /* Owen Taylor: "if the coordinates not in a drop zone,
 214        return FALSE, otherwise call gtk_drag_status() and
 215        return TRUE" */
 216
 217     /* inform the wxDropTarget about the current GdkDragContext.
 218        this is only valid for the duration of this call */
 219     drop_target->SetDragContext( context );
 220
 221     // GTK+ always supposes that we want to copy the data by default while we
 222     // might want to move it, so examine not only suggested_action - which is
 223     // only good if we don't have our own preferences - but also the actions
 224     // field
 225     wxDragResult result;
 226     if (drop_target->GetDefaultAction() == wxDragNone)
 227     {
 228         // use default action set by wxDropSource::DoDragDrop()
 229     if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 230             (context->actions & GDK_ACTION_MOVE ) )
 231     {
 232         // move is requested by the program and allowed by GTK+ - do it, even
 233         // though suggested_action may be currently wxDragCopy
 234         result = wxDragMove;
 235     }
 236     else // use whatever GTK+ says we should
 237     {
 238         result = ConvertFromGTK(context->suggested_action);
 239
 240         if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 241         {
 242             // we're requested to move but we can't
 243             result = wxDragCopy;
 244         }
 245     }
 246     }
 247     else if (drop_target->GetDefaultAction() == wxDragMove &&
 248                 (context->actions & GDK_ACTION_MOVE))
 249     {
 250        result = wxDragMove;
 251     }
 252     else
 253     {
 254         if (context->actions & GDK_ACTION_COPY)
 255             result = wxDragCopy;
 256         else if (context->actions & GDK_ACTION_MOVE)
 257             result = wxDragMove;
 258         else
 259             result = wxDragNone;
 260     }
 261
 262     if (drop_target->m_firstMotion)
 263     {
 264         /* the first "drag_motion" event substitutes a "drag_enter" event */
 265         result = drop_target->OnEnter( x, y, result );
 266     }
 267     else
 268     {
 269         /* give program a chance to react (i.e. to say no by returning FALSE) */
 270         result = drop_target->OnDragOver( x, y, result );
 271     }
 272
 273     bool ret = wxIsDragResultOk( result );
 274     if (ret)
 275     {
 276         GdkDragAction action;
 277         if (result == wxDragCopy)
 278             action = GDK_ACTION_COPY;
 279         else if (result == wxDragLink)
 280             action = GDK_ACTION_LINK;
 281         else
 282             action = GDK_ACTION_MOVE;
 283
 284         gdk_drag_status( context, action, time );
 285     }
 286
 287     /* after this, invalidate the drop_target's GdkDragContext */
 288     drop_target->SetDragContext( (GdkDragContext*) NULL );
 289
 290     /* this has to be done because GDK has no "drag_enter" event */
 291     drop_target->m_firstMotion = false;
 292
 293     return ret;
 294 }
 295 }
 296
 297 // ----------------------------------------------------------------------------
 298 // "drag_drop"
 299 // ----------------------------------------------------------------------------
 300
 301 extern "C" {
 302 static gboolean target_drag_drop( GtkWidget *widget,
 303                                   GdkDragContext *context,
 304                                   gint x,
 305                                   gint y,
 306                                   guint time,
 307                                   wxDropTarget *drop_target )
 308 {
 309     if (g_isIdle) wxapp_install_idle_handler();
 310
 311     /* Owen Taylor: "if the drop is not in a drop zone,
 312        return FALSE, otherwise, if you aren't accepting
 313        the drop, call gtk_drag_finish() with success == FALSE
 314        otherwise call gtk_drag_data_get()" */
 315
 316 //    printf( "drop.\n" );
 317
 318     /* this seems to make a difference between not accepting
 319        due to wrong target area and due to wrong format. let
 320        us hope that this is not required.. */
 321
 322     /* inform the wxDropTarget about the current GdkDragContext.
 323        this is only valid for the duration of this call */
 324     drop_target->SetDragContext( context );
 325
 326     /* inform the wxDropTarget about the current drag widget.
 327        this is only valid for the duration of this call */
 328     drop_target->SetDragWidget( widget );
 329
 330     /* inform the wxDropTarget about the current drag time.
 331        this is only valid for the duration of this call */
 332     drop_target->SetDragTime( time );
 333
 334 /*
 335     wxDragResult result = wxDragMove;
 336     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 337 */
 338
 339     /* reset the block here as someone might very well
 340        show a dialog as a reaction to a drop and this
 341        wouldn't work without events */
 342     g_blockEventsOnDrag = false;
 343
 344     bool ret = drop_target->OnDrop( x, y );
 345
 346     if (!ret)
 347     {
 348         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 349
 350         /* cancel the whole thing */
 351         gtk_drag_finish( context,
 352                           FALSE,        /* no success */
 353                           FALSE,        /* don't delete data on dropping side */
 354                           time );
 355     }
 356     else
 357     {
 358         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned TRUE") );
 359
 360 #if wxUSE_THREADS
 361         /* disable GUI threads */
 362 #endif
 363
 364         GdkAtom format = drop_target->GetMatchingPair();
 365
 366         // this does happen somehow, see bug 555111
 367         wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") );
 368
 369 /*
 370         GdkDragAction action = GDK_ACTION_MOVE;
 371         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 372         context->action = action;
 373 */
 374         /* this should trigger an "drag_data_received" event */
 375         gtk_drag_get_data( widget,
 376                            context,
 377                            format,
 378                            time );
 379
 380 #if wxUSE_THREADS
 381         /* re-enable GUI threads */
 382 #endif
 383     }
 384
 385     /* after this, invalidate the drop_target's GdkDragContext */
 386     drop_target->SetDragContext( (GdkDragContext*) NULL );
 387
 388     /* after this, invalidate the drop_target's drag widget */
 389     drop_target->SetDragWidget( (GtkWidget*) NULL );
 390
 391     /* this has to be done because GDK has no "drag_enter" event */
 392     drop_target->m_firstMotion = true;
 393
 394     return ret;
 395 }
 396 }
 397
 398 // ----------------------------------------------------------------------------
 399 // "drag_data_received"
 400 // ----------------------------------------------------------------------------
 401
 402 extern "C" {
 403 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 404                                        GdkDragContext *context,
 405                                        gint x,
 406                                        gint y,
 407                                        GtkSelectionData *data,
 408                                        guint WXUNUSED(info),
 409                                        guint time,
 410                                        wxDropTarget *drop_target )
 411 {
 412     if (g_isIdle) wxapp_install_idle_handler();
 413
 414     /* Owen Taylor: "call gtk_drag_finish() with
 415        success == TRUE" */
 416
 417     if ((data->length <= 0) || (data->format != 8))
 418     {
 419         /* negative data length and non 8-bit data format
 420            qualifies for junk */
 421         gtk_drag_finish (context, FALSE, FALSE, time);
 422
 423         return;
 424     }
 425
 426     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 427
 428     /* inform the wxDropTarget about the current GtkSelectionData.
 429        this is only valid for the duration of this call */
 430     drop_target->SetDragData( data );
 431
 432     wxDragResult result = ConvertFromGTK(context->action);
 433
 434     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 435     {
 436         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned TRUE") );
 437
 438         /* tell GTK that data transfer was successful */
 439         gtk_drag_finish( context, TRUE, FALSE, time );
 440     }
 441     else
 442     {
 443         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 444
 445         /* tell GTK that data transfer was not successful */
 446         gtk_drag_finish( context, FALSE, FALSE, time );
 447     }
 448
 449     /* after this, invalidate the drop_target's drag data */
 450     drop_target->SetDragData( (GtkSelectionData*) NULL );
 451 }
 452 }
 453
 454 //----------------------------------------------------------------------------
 455 // wxDropTarget
 456 //----------------------------------------------------------------------------
 457
 458 wxDropTarget::wxDropTarget( wxDataObject *data )
 459             : wxDropTargetBase( data )
 460 {
 461     m_firstMotion = true;
 462     m_dragContext = (GdkDragContext*) NULL;
 463     m_dragWidget = (GtkWidget*) NULL;
 464     m_dragData = (GtkSelectionData*) NULL;
 465     m_dragTime = 0;
 466 }
 467
 468 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 469                                        wxCoord WXUNUSED(y),
 470                                        wxDragResult def )
 471 {
 472     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 473
 474     // disable the debug message from GetMatchingPair() - there are too many
 475     // of them otherwise
 476 #ifdef __WXDEBUG__
 477     wxLogNull noLog;
 478 #endif // Debug
 479
 480     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 481 }
 482
 483 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 484 {
 485     if (!m_dataObject)
 486         return false;
 487
 488     return (GetMatchingPair() != (GdkAtom) 0);
 489 }
 490
 491 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 492                                    wxDragResult def )
 493 {
 494     if (!m_dataObject)
 495         return wxDragNone;
 496
 497     if (GetMatchingPair() == (GdkAtom) 0)
 498         return wxDragNone;
 499
 500     return GetData() ? def : wxDragNone;
 501 }
 502
 503 GdkAtom wxDropTarget::GetMatchingPair()
 504 {
 505     if (!m_dataObject)
 506         return (GdkAtom) 0;
 507
 508     if (!m_dragContext)
 509         return (GdkAtom) 0;
 510
 511     GList *child = m_dragContext->targets;
 512     while (child)
 513     {
 514         GdkAtom formatAtom = GPOINTER_TO_INT(child->data);
 515         wxDataFormat format( formatAtom );
 516
 517 #ifdef __WXDEBUG__
 518         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 519                    format.GetId().c_str());
 520 #endif // Debug
 521
 522         if (m_dataObject->IsSupportedFormat( format ))
 523             return formatAtom;
 524
 525         child = child->next;
 526     }
 527
 528     return (GdkAtom) 0;
 529 }
 530
 531 bool wxDropTarget::GetData()
 532 {
 533     if (!m_dragData)
 534         return false;
 535
 536     if (!m_dataObject)
 537         return false;
 538
 539     wxDataFormat dragFormat( m_dragData->target );
 540
 541     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 542         return false;
 543
 544     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 545
 546     return true;
 547 }
 548
 549 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 550 {
 551     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 552
 553     gtk_drag_dest_unset( widget );
 554
 555     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 556                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 557
 558     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 559                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 560
 561     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 562                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 563
 564     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 565                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 566 }
 567
 568 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 569 {
 570     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 571
 572     /* gtk_drag_dest_set() determines what default behaviour we'd like
 573        GTK to supply. we don't want to specify out targets (=formats)
 574        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 575        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 576        "drag_motion" and "drag_drop" events. this makes it possible
 577        to allow dropping on only a small area. we should set
 578        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 579        highlighting if dragging over standard controls, but this
 580        seems to be broken without the other two. */
 581
 582     gtk_drag_dest_set( widget,
 583                        (GtkDestDefaults) 0,         /* no default behaviour */
 584                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 585                        0,                           /* number of targets = 0 */
 586                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 587
 588     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 589                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 590
 591     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 592                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 593
 594     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 595                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 596
 597     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 598                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 599 }
 600
 601 //----------------------------------------------------------------------------
 602 // "drag_data_get"
 603 //----------------------------------------------------------------------------
 604
 605 extern "C" {
 606 static void
 607 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 608                        GdkDragContext     *WXUNUSED(context),
 609                        GtkSelectionData   *selection_data,
 610                        guint               WXUNUSED(info),
 611                        guint               WXUNUSED(time),
 612                        wxDropSource       *drop_source )
 613 {
 614     if (g_isIdle) wxapp_install_idle_handler();
 615
 616     wxDataFormat format( selection_data->target );
 617
 618     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 619                format.GetId().c_str());
 620
 621     drop_source->m_retValue = wxDragCancel;
 622
 623     wxDataObject *data = drop_source->GetDataObject();
 624
 625     if (!data)
 626     {
 627         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 628         return;
 629     }
 630
 631     if (!data->IsSupportedFormat(format))
 632     {
 633         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 634         return;
 635     }
 636
 637     if (data->GetDataSize(format) == 0)
 638     {
 639         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 640         return;
 641     }
 642
 643     size_t size = data->GetDataSize(format);
 644
 645 //  printf( "data size: %d.\n", (int)data_size );
 646
 647     guchar *d = new guchar[size];
 648
 649     if (!data->GetDataHere( format, (void*)d ))
 650     {
 651         delete[] d;
 652         return;
 653     }
 654
 655 #if wxUSE_THREADS
 656     /* disable GUI threads */
 657 #endif
 658
 659     gtk_selection_data_set( selection_data,
 660                             selection_data->target,
 661                             8,   // 8-bit
 662                             d,
 663                             size );
 664
 665 #if wxUSE_THREADS
 666     /* enable GUI threads */
 667 #endif
 668
 669     delete[] d;
 670 }
 671 }
 672
 673 //----------------------------------------------------------------------------
 674 // "drag_data_delete"
 675 //----------------------------------------------------------------------------
 676
 677 extern "C" {
 678 static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
 679                                      GdkDragContext *context,
 680                                      wxDropSource *WXUNUSED(drop_source) )
 681 {
 682     if (g_isIdle)
 683         wxapp_install_idle_handler();
 684
 685     // printf( "Drag source: drag_data_delete\n" );
 686 }
 687 }
 688
 689 //----------------------------------------------------------------------------
 690 // "drag_begin"
 691 //----------------------------------------------------------------------------
 692
 693 extern "C" {
 694 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 695                                GdkDragContext     *WXUNUSED(context),
 696                                wxDropSource       *WXUNUSED(drop_source) )
 697 {
 698     if (g_isIdle)
 699         wxapp_install_idle_handler();
 700
 701     // printf( "Drag source: drag_begin.\n" );
 702 }
 703 }
 704
 705 //----------------------------------------------------------------------------
 706 // "drag_end"
 707 //----------------------------------------------------------------------------
 708
 709 extern "C" {
 710 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 711                              GdkDragContext     *WXUNUSED(context),
 712                              wxDropSource       *drop_source )
 713 {
 714     if (g_isIdle) wxapp_install_idle_handler();
 715
 716     // printf( "Drag source: drag_end.\n" );
 717
 718     drop_source->m_waiting = false;
 719 }
 720 }
 721
 722 //-----------------------------------------------------------------------------
 723 // "configure_event" from m_iconWindow
 724 //-----------------------------------------------------------------------------
 725
 726 extern "C" {
 727 static gint
 728 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 729 {
 730     if (g_isIdle)
 731         wxapp_install_idle_handler();
 732
 733     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 734
 735     return 0;
 736 }
 737 }
 738
 739 //---------------------------------------------------------------------------
 740 // wxDropSource
 741 //---------------------------------------------------------------------------
 742
 743 wxDropSource::wxDropSource(wxWindow *win,
 744                            const wxIcon &iconCopy,
 745                            const wxIcon &iconMove,
 746                            const wxIcon &iconNone)
 747 {
 748     m_waiting = true;
 749
 750     m_iconWindow = (GtkWidget*) NULL;
 751
 752     m_window = win;
 753     m_widget = win->m_widget;
 754     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 755
 756     m_retValue = wxDragCancel;
 757
 758     SetIcons(iconCopy, iconMove, iconNone);
 759 }
 760
 761 wxDropSource::wxDropSource(wxDataObject& data,
 762                            wxWindow *win,
 763                            const wxIcon &iconCopy,
 764                            const wxIcon &iconMove,
 765                            const wxIcon &iconNone)
 766 {
 767     m_waiting = true;
 768
 769     SetData( data );
 770
 771     m_iconWindow = (GtkWidget*) NULL;
 772
 773     m_window = win;
 774     m_widget = win->m_widget;
 775     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 776
 777     m_retValue = wxDragCancel;
 778
 779     SetIcons(iconCopy, iconMove, iconNone);
 780 }
 781
 782 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 783                             const wxIcon &iconMove,
 784                             const wxIcon &iconNone)
 785 {
 786     m_iconCopy = iconCopy;
 787     m_iconMove = iconMove;
 788     m_iconNone = iconNone;
 789
 790     if ( !m_iconCopy.Ok() )
 791         m_iconCopy = wxIcon(page_xpm);
 792     if ( !m_iconMove.Ok() )
 793         m_iconMove = m_iconCopy;
 794     if ( !m_iconNone.Ok() )
 795         m_iconNone = m_iconCopy;
 796 }
 797
 798 wxDropSource::~wxDropSource()
 799 {
 800 }
 801
 802 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 803 {
 804     // get the right icon to display
 805     wxIcon *icon = NULL;
 806     if ( action & GDK_ACTION_MOVE )
 807         icon = &m_iconMove;
 808     else if ( action & GDK_ACTION_COPY )
 809         icon = &m_iconCopy;
 810     else
 811         icon = &m_iconNone;
 812
 813     GdkBitmap *mask;
 814     if ( icon->GetMask() )
 815         mask = icon->GetMask()->GetBitmap();
 816     else
 817         mask = (GdkBitmap *)NULL;
 818
 819     GdkPixmap *pixmap = icon->GetPixmap();
 820
 821     gint width,height;
 822     gdk_window_get_size (pixmap, &width, &height);
 823
 824     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 825     gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
 826     gtk_widget_push_colormap (colormap);
 827
 828     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 829     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 830     gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
 831
 832     gtk_widget_pop_visual ();
 833     gtk_widget_pop_colormap ();
 834
 835     gtk_widget_set_usize (m_iconWindow, width, height);
 836     gtk_widget_realize (m_iconWindow);
 837
 838     gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
 839         GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
 840
 841     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 842
 843     if (mask)
 844         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 845
 846     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 847 }
 848
 849 wxDragResult wxDropSource::DoDragDrop(int flags)
 850 {
 851     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 852                  wxT("Drop source: no data") );
 853
 854     // still in drag
 855     if (g_blockEventsOnDrag)
 856         return wxDragNone;
 857
 858     // disabled for now
 859     g_blockEventsOnDrag = true;
 860
 861     RegisterWindow();
 862
 863     m_waiting = true;
 864
 865     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 866
 867     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 868     m_data->GetAllFormats( array );
 869     size_t count = m_data->GetFormatCount();
 870     for (size_t i = 0; i < count; i++)
 871     {
 872         GdkAtom atom = array[i];
 873         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 874         gtk_target_list_add( target_list, atom, 0, 0 );
 875     }
 876     delete[] array;
 877
 878     /* don't start dragging if no button is down */
 879     if (g_lastButtonNumber)
 880     {
 881         int action = GDK_ACTION_COPY;
 882         if ( flags & wxDrag_AllowMove )
 883             action |= GDK_ACTION_MOVE;
 884
 885         // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 886         //     to use a global to pass the flags to the drop target but I'd
 887         //     surely prefer a better way to do it
 888         gs_flagsForDrag = flags;
 889
 890         GdkDragContext *context = gtk_drag_begin( m_widget,
 891                 target_list,
 892                 (GdkDragAction)action,
 893                 g_lastButtonNumber,  // number of mouse button which started drag
 894                 (GdkEvent*) g_lastMouseEvent );
 895
 896         m_dragContext = context;
 897
 898         PrepareIcon( action, context );
 899
 900         while (m_waiting)
 901             gtk_main_iteration();
 902
 903         m_retValue = ConvertFromGTK(context->action);
 904         if ( m_retValue == wxDragNone )
 905             m_retValue = wxDragCancel;
 906     }
 907
 908     g_blockEventsOnDrag = false;
 909
 910     UnregisterWindow();
 911
 912     return m_retValue;
 913 }
 914
 915 void wxDropSource::RegisterWindow()
 916 {
 917     if (!m_widget) return;
 918
 919     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 920                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 921     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 922                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 923     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 924                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 925     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 926                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 927
 928 }
 929
 930 void wxDropSource::UnregisterWindow()
 931 {
 932     if (!m_widget) return;
 933
 934     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 935                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 936     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 937                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 938     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 939                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 940     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 941                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 942 }
 943
 944 #endif
 945       // wxUSE_DRAG_AND_DROP