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 //----------------------------------------------------------------------------
  62 // standard icons
  63 //----------------------------------------------------------------------------
  64
  65 /* Copyright (c) Julian Smart */
  66 static const char * page_xpm[] = {
  67 /* columns rows colors chars-per-pixel */
  68 "32 32 37 1",
  69 "5 c #7198D9",
  70 ", c #769CDA",
  71 "2 c #DCE6F6",
  72 "i c #FFFFFF",
  73 "e c #779DDB",
  74 ": c #9AB6E4",
  75 "9 c #EAF0FA",
  76 "- c #B1C7EB",
  77 "$ c #6992D7",
  78 "y c #F7F9FD",
  79 "= c #BED0EE",
  80 "q c #F0F5FC",
  81 "; c #A8C0E8",
  82 "@ c #366BC2",
  83 "  c None",
  84 "u c #FDFEFF",
  85 "8 c #5987D3",
  86 "* c #C4D5F0",
  87 "7 c #7CA0DC",
  88 "O c #487BCE",
  89 "< c #6B94D7",
  90 "& c #CCDAF2",
  91 "> c #89A9DF",
  92 "3 c #5584D1",
  93 "w c #82A5DE",
  94 "1 c #3F74CB",
  95 "+ c #3A70CA",
  96 ". c #3569BF",
  97 "% c #D2DFF4",
  98 "# c #3366BB",
  99 "r c #F5F8FD",
 100 "0 c #FAFCFE",
 101 "4 c #DFE8F7",
 102 "X c #5E8AD4",
 103 "o c #5282D0",
 104 "t c #B8CCEC",
 105 "6 c #E5EDF9",
 106 /* pixels */
 107 "                                ",
 108 "                                ",
 109 "                                ",
 110 "                                ",
 111 "                                ",
 112 "       .XXXooOO++@#             ",
 113 "       $%&*=-;::>,<1            ",
 114 "       $2%&*=-;::><:3           ",
 115 "       $42%&*=-;::<&:3          ",
 116 "       56477<<<<8<<9&:X         ",
 117 "       59642%&*=-;<09&:5        ",
 118 "       5q9642%&*=-<<<<<#        ",
 119 "       5qqw777<<<<<88:>+        ",
 120 "       erqq9642%&*=t;::+        ",
 121 "       eyrqq9642%&*=t;:O        ",
 122 "       eyywwww777<<<<t;O        ",
 123 "       e0yyrqq9642%&*=to        ",
 124 "       e00yyrqq9642%&*=o        ",
 125 "       eu0wwwwwww777<&*X        ",
 126 "       euu00yyrqq9642%&X        ",
 127 "       eiuu00yyrqq9642%X        ",
 128 "       eiiwwwwwwwwww742$        ",
 129 "       eiiiuu00yyrqq964$        ",
 130 "       eiiiiuu00yyrqq96$        ",
 131 "       eiiiiiuu00yyrqq95        ",
 132 "       eiiiiiiuu00yyrqq5        ",
 133 "       eeeeeeeeeeeeee55e        ",
 134 "                                ",
 135 "                                ",
 136 "                                ",
 137 "                                ",
 138 "                                "
 139 };
 140
 141
 142 // ============================================================================
 143 // private functions
 144 // ============================================================================
 145
 146 // ----------------------------------------------------------------------------
 147 // convert between GTK+ and wxWidgets DND constants
 148 // ----------------------------------------------------------------------------
 149
 150 static wxDragResult ConvertFromGTK(long action)
 151 {
 152     switch ( action )
 153     {
 154         case GDK_ACTION_COPY:
 155             return wxDragCopy;
 156
 157         case GDK_ACTION_LINK:
 158             return wxDragLink;
 159
 160         case GDK_ACTION_MOVE:
 161             return wxDragMove;
 162     }
 163
 164     return wxDragNone;
 165 }
 166
 167 // ----------------------------------------------------------------------------
 168 // "drag_leave"
 169 // ----------------------------------------------------------------------------
 170
 171 extern "C" {
 172 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 173                                GdkDragContext *context,
 174                                guint WXUNUSED(time),
 175                                wxDropTarget *drop_target )
 176 {
 177     if (g_isIdle) wxapp_install_idle_handler();
 178
 179     /* inform the wxDropTarget about the current GdkDragContext.
 180        this is only valid for the duration of this call */
 181     drop_target->SetDragContext( context );
 182
 183     /* we don't need return values. this event is just for
 184        information */
 185     drop_target->OnLeave();
 186
 187     /* this has to be done because GDK has no "drag_enter" event */
 188     drop_target->m_firstMotion = true;
 189
 190     /* after this, invalidate the drop_target's GdkDragContext */
 191     drop_target->SetDragContext( (GdkDragContext*) NULL );
 192 }
 193 }
 194
 195 // ----------------------------------------------------------------------------
 196 // "drag_motion"
 197 // ----------------------------------------------------------------------------
 198
 199 extern "C" {
 200 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 201                                     GdkDragContext *context,
 202                                     gint x,
 203                                     gint y,
 204                                     guint time,
 205                                     wxDropTarget *drop_target )
 206 {
 207     if (g_isIdle) wxapp_install_idle_handler();
 208
 209     /* Owen Taylor: "if the coordinates not in a drop zone,
 210        return FALSE, otherwise call gtk_drag_status() and
 211        return TRUE" */
 212
 213     /* inform the wxDropTarget about the current GdkDragContext.
 214        this is only valid for the duration of this call */
 215     drop_target->SetDragContext( context );
 216
 217     // GTK+ always supposes that we want to copy the data by default while we
 218     // might want to move it, so examine not only suggested_action - which is
 219     // only good if we don't have our own preferences - but also the actions
 220     // field
 221     wxDragResult result;
 222     if (drop_target->GetDefaultAction() == wxDragNone)
 223     {
 224         // use default action set by wxDropSource::DoDragDrop()
 225     if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 226             (context->actions & GDK_ACTION_MOVE ) )
 227     {
 228         // move is requested by the program and allowed by GTK+ - do it, even
 229         // though suggested_action may be currently wxDragCopy
 230         result = wxDragMove;
 231     }
 232     else // use whatever GTK+ says we should
 233     {
 234         result = ConvertFromGTK(context->suggested_action);
 235
 236         if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 237         {
 238             // we're requested to move but we can't
 239             result = wxDragCopy;
 240         }
 241     }
 242     }
 243     else if (drop_target->GetDefaultAction() == wxDragMove &&
 244                 (context->actions & GDK_ACTION_MOVE))
 245     {
 246        result = wxDragMove;
 247     }
 248     else
 249     {
 250         if (context->actions & GDK_ACTION_COPY)
 251             result = wxDragCopy;
 252         else if (context->actions & GDK_ACTION_MOVE)
 253             result = wxDragMove;
 254         else
 255             result = wxDragNone;
 256     }
 257
 258     if (drop_target->m_firstMotion)
 259     {
 260         /* the first "drag_motion" event substitutes a "drag_enter" event */
 261         result = drop_target->OnEnter( x, y, result );
 262     }
 263     else
 264     {
 265         /* give program a chance to react (i.e. to say no by returning FALSE) */
 266         result = drop_target->OnDragOver( x, y, result );
 267     }
 268
 269     bool ret = wxIsDragResultOk( result );
 270     if (ret)
 271     {
 272         GdkDragAction action;
 273         if (result == wxDragCopy)
 274             action = GDK_ACTION_COPY;
 275         else if (result == wxDragLink)
 276             action = GDK_ACTION_LINK;
 277         else
 278             action = GDK_ACTION_MOVE;
 279
 280         gdk_drag_status( context, action, time );
 281     }
 282
 283     /* after this, invalidate the drop_target's GdkDragContext */
 284     drop_target->SetDragContext( (GdkDragContext*) NULL );
 285
 286     /* this has to be done because GDK has no "drag_enter" event */
 287     drop_target->m_firstMotion = false;
 288
 289     return ret;
 290 }
 291 }
 292
 293 // ----------------------------------------------------------------------------
 294 // "drag_drop"
 295 // ----------------------------------------------------------------------------
 296
 297 extern "C" {
 298 static gboolean target_drag_drop( GtkWidget *widget,
 299                                   GdkDragContext *context,
 300                                   gint x,
 301                                   gint y,
 302                                   guint time,
 303                                   wxDropTarget *drop_target )
 304 {
 305     if (g_isIdle) wxapp_install_idle_handler();
 306
 307     /* Owen Taylor: "if the drop is not in a drop zone,
 308        return FALSE, otherwise, if you aren't accepting
 309        the drop, call gtk_drag_finish() with success == FALSE
 310        otherwise call gtk_drag_data_get()" */
 311
 312 //    printf( "drop.\n" );
 313
 314     /* this seems to make a difference between not accepting
 315        due to wrong target area and due to wrong format. let
 316        us hope that this is not required.. */
 317
 318     /* inform the wxDropTarget about the current GdkDragContext.
 319        this is only valid for the duration of this call */
 320     drop_target->SetDragContext( context );
 321
 322     /* inform the wxDropTarget about the current drag widget.
 323        this is only valid for the duration of this call */
 324     drop_target->SetDragWidget( widget );
 325
 326     /* inform the wxDropTarget about the current drag time.
 327        this is only valid for the duration of this call */
 328     drop_target->SetDragTime( time );
 329
 330 /*
 331     wxDragResult result = wxDragMove;
 332     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 333 */
 334
 335     /* reset the block here as someone might very well
 336        show a dialog as a reaction to a drop and this
 337        wouldn't work without events */
 338     g_blockEventsOnDrag = false;
 339
 340     bool ret = drop_target->OnDrop( x, y );
 341
 342     if (!ret)
 343     {
 344         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 345
 346         /* cancel the whole thing */
 347         gtk_drag_finish( context,
 348                           FALSE,        /* no success */
 349                           FALSE,        /* don't delete data on dropping side */
 350                           time );
 351     }
 352     else
 353     {
 354         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned TRUE") );
 355
 356 #if wxUSE_THREADS
 357         /* disable GUI threads */
 358 #endif
 359
 360         GdkAtom format = drop_target->GetMatchingPair();
 361
 362         // this does happen somehow, see bug 555111
 363         wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") );
 364
 365 /*
 366         GdkDragAction action = GDK_ACTION_MOVE;
 367         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 368         context->action = action;
 369 */
 370         /* this should trigger an "drag_data_received" event */
 371         gtk_drag_get_data( widget,
 372                            context,
 373                            format,
 374                            time );
 375
 376 #if wxUSE_THREADS
 377         /* re-enable GUI threads */
 378 #endif
 379     }
 380
 381     /* after this, invalidate the drop_target's GdkDragContext */
 382     drop_target->SetDragContext( (GdkDragContext*) NULL );
 383
 384     /* after this, invalidate the drop_target's drag widget */
 385     drop_target->SetDragWidget( (GtkWidget*) NULL );
 386
 387     /* this has to be done because GDK has no "drag_enter" event */
 388     drop_target->m_firstMotion = true;
 389
 390     return ret;
 391 }
 392 }
 393
 394 // ----------------------------------------------------------------------------
 395 // "drag_data_received"
 396 // ----------------------------------------------------------------------------
 397
 398 extern "C" {
 399 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 400                                        GdkDragContext *context,
 401                                        gint x,
 402                                        gint y,
 403                                        GtkSelectionData *data,
 404                                        guint WXUNUSED(info),
 405                                        guint time,
 406                                        wxDropTarget *drop_target )
 407 {
 408     if (g_isIdle) wxapp_install_idle_handler();
 409
 410     /* Owen Taylor: "call gtk_drag_finish() with
 411        success == TRUE" */
 412
 413     if ((data->length <= 0) || (data->format != 8))
 414     {
 415         /* negative data length and non 8-bit data format
 416            qualifies for junk */
 417         gtk_drag_finish (context, FALSE, FALSE, time);
 418
 419         return;
 420     }
 421
 422     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 423
 424     /* inform the wxDropTarget about the current GtkSelectionData.
 425        this is only valid for the duration of this call */
 426     drop_target->SetDragData( data );
 427
 428     wxDragResult result = ConvertFromGTK(context->action);
 429
 430     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 431     {
 432         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned TRUE") );
 433
 434         /* tell GTK that data transfer was successful */
 435         gtk_drag_finish( context, TRUE, FALSE, time );
 436     }
 437     else
 438     {
 439         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 440
 441         /* tell GTK that data transfer was not successful */
 442         gtk_drag_finish( context, FALSE, FALSE, time );
 443     }
 444
 445     /* after this, invalidate the drop_target's drag data */
 446     drop_target->SetDragData( (GtkSelectionData*) NULL );
 447 }
 448 }
 449
 450 //----------------------------------------------------------------------------
 451 // wxDropTarget
 452 //----------------------------------------------------------------------------
 453
 454 wxDropTarget::wxDropTarget( wxDataObject *data )
 455             : wxDropTargetBase( data )
 456 {
 457     m_firstMotion = true;
 458     m_dragContext = (GdkDragContext*) NULL;
 459     m_dragWidget = (GtkWidget*) NULL;
 460     m_dragData = (GtkSelectionData*) NULL;
 461     m_dragTime = 0;
 462 }
 463
 464 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 465                                        wxCoord WXUNUSED(y),
 466                                        wxDragResult def )
 467 {
 468     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 469
 470     // disable the debug message from GetMatchingPair() - there are too many
 471     // of them otherwise
 472 #ifdef __WXDEBUG__
 473     wxLogNull noLog;
 474 #endif // Debug
 475
 476     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 477 }
 478
 479 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 480 {
 481     if (!m_dataObject)
 482         return false;
 483
 484     return (GetMatchingPair() != (GdkAtom) 0);
 485 }
 486
 487 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 488                                    wxDragResult def )
 489 {
 490     if (!m_dataObject)
 491         return wxDragNone;
 492
 493     if (GetMatchingPair() == (GdkAtom) 0)
 494         return wxDragNone;
 495
 496     return GetData() ? def : wxDragNone;
 497 }
 498
 499 GdkAtom wxDropTarget::GetMatchingPair()
 500 {
 501     if (!m_dataObject)
 502         return (GdkAtom) 0;
 503
 504     if (!m_dragContext)
 505         return (GdkAtom) 0;
 506
 507     GList *child = m_dragContext->targets;
 508     while (child)
 509     {
 510         GdkAtom formatAtom = GPOINTER_TO_INT(child->data);
 511         wxDataFormat format( formatAtom );
 512
 513 #ifdef __WXDEBUG__
 514         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 515                    format.GetId().c_str());
 516 #endif // Debug
 517
 518         if (m_dataObject->IsSupportedFormat( format ))
 519             return formatAtom;
 520
 521         child = child->next;
 522     }
 523
 524     return (GdkAtom) 0;
 525 }
 526
 527 bool wxDropTarget::GetData()
 528 {
 529     if (!m_dragData)
 530         return false;
 531
 532     if (!m_dataObject)
 533         return false;
 534
 535     wxDataFormat dragFormat( m_dragData->target );
 536
 537     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 538         return false;
 539
 540     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 541
 542     return true;
 543 }
 544
 545 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 546 {
 547     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 548
 549     gtk_drag_dest_unset( widget );
 550
 551     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 552                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 553
 554     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 555                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 556
 557     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 558                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 559
 560     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 561                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 562 }
 563
 564 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 565 {
 566     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 567
 568     /* gtk_drag_dest_set() determines what default behaviour we'd like
 569        GTK to supply. we don't want to specify out targets (=formats)
 570        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 571        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 572        "drag_motion" and "drag_drop" events. this makes it possible
 573        to allow dropping on only a small area. we should set
 574        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 575        highlighting if dragging over standard controls, but this
 576        seems to be broken without the other two. */
 577
 578     gtk_drag_dest_set( widget,
 579                        (GtkDestDefaults) 0,         /* no default behaviour */
 580                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 581                        0,                           /* number of targets = 0 */
 582                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 583
 584     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 585                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 586
 587     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 588                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 589
 590     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 591                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 592
 593     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 594                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 595 }
 596
 597 //----------------------------------------------------------------------------
 598 // "drag_data_get"
 599 //----------------------------------------------------------------------------
 600
 601 extern "C" {
 602 static void
 603 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 604                        GdkDragContext     *WXUNUSED(context),
 605                        GtkSelectionData   *selection_data,
 606                        guint               WXUNUSED(info),
 607                        guint               WXUNUSED(time),
 608                        wxDropSource       *drop_source )
 609 {
 610     if (g_isIdle) wxapp_install_idle_handler();
 611
 612     wxDataFormat format( selection_data->target );
 613
 614     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 615                format.GetId().c_str());
 616
 617     drop_source->m_retValue = wxDragCancel;
 618
 619     wxDataObject *data = drop_source->GetDataObject();
 620
 621     if (!data)
 622     {
 623         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 624         return;
 625     }
 626
 627     if (!data->IsSupportedFormat(format))
 628     {
 629         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 630         return;
 631     }
 632
 633     if (data->GetDataSize(format) == 0)
 634     {
 635         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 636         return;
 637     }
 638
 639     size_t size = data->GetDataSize(format);
 640
 641 //  printf( "data size: %d.\n", (int)data_size );
 642
 643     guchar *d = new guchar[size];
 644
 645     if (!data->GetDataHere( format, (void*)d ))
 646     {
 647         delete[] d;
 648         return;
 649     }
 650
 651 #if wxUSE_THREADS
 652     /* disable GUI threads */
 653 #endif
 654
 655     gtk_selection_data_set( selection_data,
 656                             selection_data->target,
 657                             8,   // 8-bit
 658                             d,
 659                             size );
 660
 661 #if wxUSE_THREADS
 662     /* enable GUI threads */
 663 #endif
 664
 665     delete[] d;
 666 }
 667 }
 668
 669 //----------------------------------------------------------------------------
 670 // "drag_data_delete"
 671 //----------------------------------------------------------------------------
 672
 673 extern "C" {
 674 static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
 675                                      GdkDragContext *context,
 676                                      wxDropSource *WXUNUSED(drop_source) )
 677 {
 678     if (g_isIdle)
 679         wxapp_install_idle_handler();
 680
 681     // printf( "Drag source: drag_data_delete\n" );
 682 }
 683 }
 684
 685 //----------------------------------------------------------------------------
 686 // "drag_begin"
 687 //----------------------------------------------------------------------------
 688
 689 extern "C" {
 690 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 691                                GdkDragContext     *WXUNUSED(context),
 692                                wxDropSource       *WXUNUSED(drop_source) )
 693 {
 694     if (g_isIdle)
 695         wxapp_install_idle_handler();
 696
 697     // printf( "Drag source: drag_begin.\n" );
 698 }
 699 }
 700
 701 //----------------------------------------------------------------------------
 702 // "drag_end"
 703 //----------------------------------------------------------------------------
 704
 705 extern "C" {
 706 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 707                              GdkDragContext     *WXUNUSED(context),
 708                              wxDropSource       *drop_source )
 709 {
 710     if (g_isIdle) wxapp_install_idle_handler();
 711
 712     // printf( "Drag source: drag_end.\n" );
 713
 714     drop_source->m_waiting = false;
 715 }
 716 }
 717
 718 //-----------------------------------------------------------------------------
 719 // "configure_event" from m_iconWindow
 720 //-----------------------------------------------------------------------------
 721
 722 extern "C" {
 723 static gint
 724 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 725 {
 726     if (g_isIdle)
 727         wxapp_install_idle_handler();
 728
 729     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 730
 731     return 0;
 732 }
 733 }
 734
 735 //---------------------------------------------------------------------------
 736 // wxDropSource
 737 //---------------------------------------------------------------------------
 738
 739 wxDropSource::wxDropSource(wxWindow *win,
 740                            const wxIcon &iconCopy,
 741                            const wxIcon &iconMove,
 742                            const wxIcon &iconNone)
 743 {
 744     m_waiting = true;
 745
 746     m_iconWindow = (GtkWidget*) NULL;
 747
 748     m_window = win;
 749     m_widget = win->m_widget;
 750     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 751
 752     m_retValue = wxDragCancel;
 753
 754     SetIcons(iconCopy, iconMove, iconNone);
 755 }
 756
 757 wxDropSource::wxDropSource(wxDataObject& data,
 758                            wxWindow *win,
 759                            const wxIcon &iconCopy,
 760                            const wxIcon &iconMove,
 761                            const wxIcon &iconNone)
 762 {
 763     m_waiting = true;
 764
 765     SetData( data );
 766
 767     m_iconWindow = (GtkWidget*) NULL;
 768
 769     m_window = win;
 770     m_widget = win->m_widget;
 771     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 772
 773     m_retValue = wxDragCancel;
 774
 775     SetIcons(iconCopy, iconMove, iconNone);
 776 }
 777
 778 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 779                             const wxIcon &iconMove,
 780                             const wxIcon &iconNone)
 781 {
 782     m_iconCopy = iconCopy;
 783     m_iconMove = iconMove;
 784     m_iconNone = iconNone;
 785
 786     if ( !m_iconCopy.Ok() )
 787         m_iconCopy = wxIcon(page_xpm);
 788     if ( !m_iconMove.Ok() )
 789         m_iconMove = m_iconCopy;
 790     if ( !m_iconNone.Ok() )
 791         m_iconNone = m_iconCopy;
 792 }
 793
 794 wxDropSource::~wxDropSource()
 795 {
 796 }
 797
 798 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 799 {
 800     // get the right icon to display
 801     wxIcon *icon = NULL;
 802     if ( action & GDK_ACTION_MOVE )
 803         icon = &m_iconMove;
 804     else if ( action & GDK_ACTION_COPY )
 805         icon = &m_iconCopy;
 806     else
 807         icon = &m_iconNone;
 808
 809     GdkBitmap *mask;
 810     if ( icon->GetMask() )
 811         mask = icon->GetMask()->GetBitmap();
 812     else
 813         mask = (GdkBitmap *)NULL;
 814
 815     GdkPixmap *pixmap = icon->GetPixmap();
 816
 817     gint width,height;
 818     gdk_window_get_size (pixmap, &width, &height);
 819
 820     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 821     gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
 822     gtk_widget_push_colormap (colormap);
 823
 824     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 825     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 826     gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
 827
 828     gtk_widget_pop_visual ();
 829     gtk_widget_pop_colormap ();
 830
 831     gtk_widget_set_usize (m_iconWindow, width, height);
 832     gtk_widget_realize (m_iconWindow);
 833
 834     gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
 835         GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
 836
 837     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 838
 839     if (mask)
 840         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 841
 842     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 843 }
 844
 845 wxDragResult wxDropSource::DoDragDrop(int flags)
 846 {
 847     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 848                  wxT("Drop source: no data") );
 849
 850     // still in drag
 851     if (g_blockEventsOnDrag)
 852         return wxDragNone;
 853
 854     // disabled for now
 855     g_blockEventsOnDrag = true;
 856
 857     RegisterWindow();
 858
 859     m_waiting = true;
 860
 861     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 862
 863     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 864     m_data->GetAllFormats( array );
 865     size_t count = m_data->GetFormatCount();
 866     for (size_t i = 0; i < count; i++)
 867     {
 868         GdkAtom atom = array[i];
 869         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 870         gtk_target_list_add( target_list, atom, 0, 0 );
 871     }
 872     delete[] array;
 873
 874     GdkEventMotion event;
 875     event.window = m_widget->window;
 876     int x = 0;
 877     int y = 0;
 878     GdkModifierType state;
 879     gdk_window_get_pointer( event.window, &x, &y, &state );
 880     event.x = x;
 881     event.y = y;
 882     event.state = state;
 883     event.time = (guint32)GDK_CURRENT_TIME;
 884
 885     /* GTK wants to know which button was pressed which caused the dragging */
 886     int button_number = 0;
 887     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 888     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 889     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 890
 891 #if wxUSE_THREADS
 892     /* disable GUI threads */
 893 #endif
 894
 895     /* don't start dragging if no button is down */
 896     if (button_number)
 897     {
 898         int action = GDK_ACTION_COPY;
 899         if ( flags & wxDrag_AllowMove )
 900             action |= GDK_ACTION_MOVE;
 901
 902         // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 903         //     to use a global to pass the flags to the drop target but I'd
 904         //     surely prefer a better way to do it
 905         gs_flagsForDrag = flags;
 906
 907         GdkDragContext *context = gtk_drag_begin( m_widget,
 908                 target_list,
 909                 (GdkDragAction)action,
 910                 button_number,  /* number of mouse button which started drag */
 911                 (GdkEvent*) &event );
 912
 913         m_dragContext = context;
 914
 915         PrepareIcon( action, context );
 916
 917         while (m_waiting)
 918             gtk_main_iteration();
 919
 920         m_retValue = ConvertFromGTK(context->action);
 921         if ( m_retValue == wxDragNone )
 922             m_retValue = wxDragCancel;
 923     }
 924
 925 #if wxUSE_THREADS
 926     /* re-enable GUI threads */
 927 #endif
 928
 929     g_blockEventsOnDrag = false;
 930
 931     UnregisterWindow();
 932
 933     // this shouldn't be needed but somehow, sometimes, without this the cursor
 934     // stays grabbed even when the DND operation ends and the application
 935     // becomes unresponsive and has to be killed resulting in loss of all
 936     // unsaved data, so while this fix is ugly it's still better than
 937     // alternative
 938     if ( gdk_pointer_is_grabbed() )
 939         gdk_pointer_ungrab(GDK_CURRENT_TIME);
 940
 941     return m_retValue;
 942 }
 943
 944 void wxDropSource::RegisterWindow()
 945 {
 946     if (!m_widget) return;
 947
 948     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 949                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 950     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 951                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 952     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 953                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 954     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 955                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 956
 957 }
 958
 959 void wxDropSource::UnregisterWindow()
 960 {
 961     if (!m_widget) return;
 962
 963     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 964                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 965     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 966                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 967     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 968                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 969     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 970                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 971 }
 972
 973 #endif
 974       // wxUSE_DRAG_AND_DROP