src/gtk1/dnd.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        dnd.cpp
   3 // Purpose:     wxDropTarget class
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 ///////////////////////////////////////////////////////////////////////////////
   9
  10 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  11     #pragma implementation "dnd.h"
  12 #endif
  13
  14 // For compilers that support precompilation, includes "wx.h".
  15 #include "wx/wxprec.h"
  16
  17 #include "wx/dnd.h"
  18 #include "wx/log.h"
  19
  20
  21 #if wxUSE_DRAG_AND_DROP
  22
  23 #include "wx/window.h"
  24 #include "wx/app.h"
  25 #include "wx/gdicmn.h"
  26 #include "wx/intl.h"
  27 #include "wx/utils.h"
  28
  29 #include "wx/gtk/private.h"
  30
  31 #include <gdk/gdkprivate.h>
  32
  33 #include <gtk/gtkdnd.h>
  34 #include <gtk/gtkselection.h>
  35
  36 //-----------------------------------------------------------------------------
  37 // idle system
  38 //-----------------------------------------------------------------------------
  39
  40 extern void wxapp_install_idle_handler();
  41 extern bool g_isIdle;
  42
  43 //-----------------------------------------------------------------------------
  44 // thread system
  45 //-----------------------------------------------------------------------------
  46
  47 #if wxUSE_THREADS
  48 #endif
  49
  50 //----------------------------------------------------------------------------
  51 // global data
  52 //----------------------------------------------------------------------------
  53
  54 extern bool g_blockEventsOnDrag;
  55
  56 // the flags used for the last DoDragDrop()
  57 static long gs_flagsForDrag = 0;
  58
  59 // the trace mask we use with wxLogTrace() - call
  60 // wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
  61 // (there are quite a few of them, so don't enable this by default)
  62 static const wxChar *TRACE_DND = _T("dnd");
  63
  64 //----------------------------------------------------------------------------
  65 // standard icons
  66 //----------------------------------------------------------------------------
  67
  68 /* Copyright (c) Julian Smart */
  69 static const char * page_xpm[] = {
  70 /* columns rows colors chars-per-pixel */
  71 "32 32 37 1",
  72 "5 c #7198D9",
  73 ", c #769CDA",
  74 "2 c #DCE6F6",
  75 "i c #FFFFFF",
  76 "e c #779DDB",
  77 ": c #9AB6E4",
  78 "9 c #EAF0FA",
  79 "- c #B1C7EB",
  80 "$ c #6992D7",
  81 "y c #F7F9FD",
  82 "= c #BED0EE",
  83 "q c #F0F5FC",
  84 "; c #A8C0E8",
  85 "@ c #366BC2",
  86 "  c None",
  87 "u c #FDFEFF",
  88 "8 c #5987D3",
  89 "* c #C4D5F0",
  90 "7 c #7CA0DC",
  91 "O c #487BCE",
  92 "< c #6B94D7",
  93 "& c #CCDAF2",
  94 "> c #89A9DF",
  95 "3 c #5584D1",
  96 "w c #82A5DE",
  97 "1 c #3F74CB",
  98 "+ c #3A70CA",
  99 ". c #3569BF",
 100 "% c #D2DFF4",
 101 "# c #3366BB",
 102 "r c #F5F8FD",
 103 "0 c #FAFCFE",
 104 "4 c #DFE8F7",
 105 "X c #5E8AD4",
 106 "o c #5282D0",
 107 "t c #B8CCEC",
 108 "6 c #E5EDF9",
 109 /* pixels */
 110 "                                ",
 111 "                                ",
 112 "                                ",
 113 "                                ",
 114 "                                ",
 115 "       .XXXooOO++@#             ",
 116 "       $%&*=-;::>,<1            ",
 117 "       $2%&*=-;::><:3           ",
 118 "       $42%&*=-;::<&:3          ",
 119 "       56477<<<<8<<9&:X         ",
 120 "       59642%&*=-;<09&:5        ",
 121 "       5q9642%&*=-<<<<<#        ",
 122 "       5qqw777<<<<<88:>+        ",
 123 "       erqq9642%&*=t;::+        ",
 124 "       eyrqq9642%&*=t;:O        ",
 125 "       eyywwww777<<<<t;O        ",
 126 "       e0yyrqq9642%&*=to        ",
 127 "       e00yyrqq9642%&*=o        ",
 128 "       eu0wwwwwww777<&*X        ",
 129 "       euu00yyrqq9642%&X        ",
 130 "       eiuu00yyrqq9642%X        ",
 131 "       eiiwwwwwwwwww742$        ",
 132 "       eiiiuu00yyrqq964$        ",
 133 "       eiiiiuu00yyrqq96$        ",
 134 "       eiiiiiuu00yyrqq95        ",
 135 "       eiiiiiiuu00yyrqq5        ",
 136 "       eeeeeeeeeeeeee55e        ",
 137 "                                ",
 138 "                                ",
 139 "                                ",
 140 "                                ",
 141 "                                "
 142 };
 143
 144
 145 // ============================================================================
 146 // private functions
 147 // ============================================================================
 148
 149 // ----------------------------------------------------------------------------
 150 // convert between GTK+ and wxWidgets DND constants
 151 // ----------------------------------------------------------------------------
 152
 153 static wxDragResult ConvertFromGTK(long action)
 154 {
 155     switch ( action )
 156     {
 157         case GDK_ACTION_COPY:
 158             return wxDragCopy;
 159
 160         case GDK_ACTION_LINK:
 161             return wxDragLink;
 162
 163         case GDK_ACTION_MOVE:
 164             return wxDragMove;
 165     }
 166
 167     return wxDragNone;
 168 }
 169
 170 // ----------------------------------------------------------------------------
 171 // "drag_leave"
 172 // ----------------------------------------------------------------------------
 173
 174 extern "C" {
 175 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 176                                GdkDragContext *context,
 177                                guint WXUNUSED(time),
 178                                wxDropTarget *drop_target )
 179 {
 180     if (g_isIdle) wxapp_install_idle_handler();
 181
 182     /* inform the wxDropTarget about the current GdkDragContext.
 183        this is only valid for the duration of this call */
 184     drop_target->SetDragContext( context );
 185
 186     /* we don't need return values. this event is just for
 187        information */
 188     drop_target->OnLeave();
 189
 190     /* this has to be done because GDK has no "drag_enter" event */
 191     drop_target->m_firstMotion = true;
 192
 193     /* after this, invalidate the drop_target's GdkDragContext */
 194     drop_target->SetDragContext( (GdkDragContext*) NULL );
 195 }
 196 }
 197
 198 // ----------------------------------------------------------------------------
 199 // "drag_motion"
 200 // ----------------------------------------------------------------------------
 201
 202 extern "C" {
 203 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 204                                     GdkDragContext *context,
 205                                     gint x,
 206                                     gint y,
 207                                     guint time,
 208                                     wxDropTarget *drop_target )
 209 {
 210     if (g_isIdle) wxapp_install_idle_handler();
 211
 212     /* Owen Taylor: "if the coordinates not in a drop zone,
 213        return FALSE, otherwise call gtk_drag_status() and
 214        return TRUE" */
 215
 216     /* inform the wxDropTarget about the current GdkDragContext.
 217        this is only valid for the duration of this call */
 218     drop_target->SetDragContext( context );
 219
 220     // GTK+ always supposes that we want to copy the data by default while we
 221     // might want to move it, so examine not only suggested_action - which is
 222     // only good if we don't have our own preferences - but also the actions
 223     // field
 224     wxDragResult result;
 225     if (drop_target->GetDefaultAction() == wxDragNone)
 226     {
 227         // use default action set by wxDropSource::DoDragDrop()
 228     if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 229             (context->actions & GDK_ACTION_MOVE ) )
 230     {
 231         // move is requested by the program and allowed by GTK+ - do it, even
 232         // though suggested_action may be currently wxDragCopy
 233         result = wxDragMove;
 234     }
 235     else // use whatever GTK+ says we should
 236     {
 237         result = ConvertFromGTK(context->suggested_action);
 238
 239         if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 240         {
 241             // we're requested to move but we can't
 242             result = wxDragCopy;
 243         }
 244     }
 245     }
 246     else if (drop_target->GetDefaultAction() == wxDragMove &&
 247                 (context->actions & GDK_ACTION_MOVE))
 248     {
 249        result = wxDragMove;
 250     }
 251     else
 252     {
 253         if (context->actions & GDK_ACTION_COPY)
 254             result = wxDragCopy;
 255         else if (context->actions & GDK_ACTION_MOVE)
 256             result = wxDragMove;
 257         else
 258             result = wxDragNone;
 259     }
 260
 261     if (drop_target->m_firstMotion)
 262     {
 263         /* the first "drag_motion" event substitutes a "drag_enter" event */
 264         result = drop_target->OnEnter( x, y, result );
 265     }
 266     else
 267     {
 268         /* give program a chance to react (i.e. to say no by returning FALSE) */
 269         result = drop_target->OnDragOver( x, y, result );
 270     }
 271
 272     bool ret = wxIsDragResultOk( result );
 273     if (ret)
 274     {
 275         GdkDragAction action;
 276         if (result == wxDragCopy)
 277             action = GDK_ACTION_COPY;
 278         else if (result == wxDragLink)
 279             action = GDK_ACTION_LINK;
 280         else
 281             action = GDK_ACTION_MOVE;
 282
 283         gdk_drag_status( context, action, time );
 284     }
 285
 286     /* after this, invalidate the drop_target's GdkDragContext */
 287     drop_target->SetDragContext( (GdkDragContext*) NULL );
 288
 289     /* this has to be done because GDK has no "drag_enter" event */
 290     drop_target->m_firstMotion = false;
 291
 292     return ret;
 293 }
 294 }
 295
 296 // ----------------------------------------------------------------------------
 297 // "drag_drop"
 298 // ----------------------------------------------------------------------------
 299
 300 extern "C" {
 301 static gboolean target_drag_drop( GtkWidget *widget,
 302                                   GdkDragContext *context,
 303                                   gint x,
 304                                   gint y,
 305                                   guint time,
 306                                   wxDropTarget *drop_target )
 307 {
 308     if (g_isIdle) wxapp_install_idle_handler();
 309
 310     /* Owen Taylor: "if the drop is not in a drop zone,
 311        return FALSE, otherwise, if you aren't accepting
 312        the drop, call gtk_drag_finish() with success == FALSE
 313        otherwise call gtk_drag_data_get()" */
 314
 315 //    printf( "drop.\n" );
 316
 317     /* this seems to make a difference between not accepting
 318        due to wrong target area and due to wrong format. let
 319        us hope that this is not required.. */
 320
 321     /* inform the wxDropTarget about the current GdkDragContext.
 322        this is only valid for the duration of this call */
 323     drop_target->SetDragContext( context );
 324
 325     /* inform the wxDropTarget about the current drag widget.
 326        this is only valid for the duration of this call */
 327     drop_target->SetDragWidget( widget );
 328
 329     /* inform the wxDropTarget about the current drag time.
 330        this is only valid for the duration of this call */
 331     drop_target->SetDragTime( time );
 332
 333 /*
 334     wxDragResult result = wxDragMove;
 335     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 336 */
 337
 338     /* reset the block here as someone might very well
 339        show a dialog as a reaction to a drop and this
 340        wouldn't work without events */
 341     g_blockEventsOnDrag = false;
 342
 343     bool ret = drop_target->OnDrop( x, y );
 344
 345     if (!ret)
 346     {
 347         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 348
 349         /* cancel the whole thing */
 350         gtk_drag_finish( context,
 351                           FALSE,        /* no success */
 352                           FALSE,        /* don't delete data on dropping side */
 353                           time );
 354     }
 355     else
 356     {
 357         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned TRUE") );
 358
 359 #if wxUSE_THREADS
 360         /* disable GUI threads */
 361 #endif
 362
 363         GdkAtom format = drop_target->GetMatchingPair();
 364
 365         // this does happen somehow, see bug 555111
 366         wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") )
 367
 368 /*
 369         GdkDragAction action = GDK_ACTION_MOVE;
 370         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 371         context->action = action;
 372 */
 373         /* this should trigger an "drag_data_received" event */
 374         gtk_drag_get_data( widget,
 375                            context,
 376                            format,
 377                            time );
 378
 379 #if wxUSE_THREADS
 380         /* re-enable GUI threads */
 381 #endif
 382     }
 383
 384     /* after this, invalidate the drop_target's GdkDragContext */
 385     drop_target->SetDragContext( (GdkDragContext*) NULL );
 386
 387     /* after this, invalidate the drop_target's drag widget */
 388     drop_target->SetDragWidget( (GtkWidget*) NULL );
 389
 390     /* this has to be done because GDK has no "drag_enter" event */
 391     drop_target->m_firstMotion = true;
 392
 393     return ret;
 394 }
 395 }
 396
 397 // ----------------------------------------------------------------------------
 398 // "drag_data_received"
 399 // ----------------------------------------------------------------------------
 400
 401 extern "C" {
 402 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 403                                        GdkDragContext *context,
 404                                        gint x,
 405                                        gint y,
 406                                        GtkSelectionData *data,
 407                                        guint WXUNUSED(info),
 408                                        guint time,
 409                                        wxDropTarget *drop_target )
 410 {
 411     if (g_isIdle) wxapp_install_idle_handler();
 412
 413     /* Owen Taylor: "call gtk_drag_finish() with
 414        success == TRUE" */
 415
 416     if ((data->length <= 0) || (data->format != 8))
 417     {
 418         /* negative data length and non 8-bit data format
 419            qualifies for junk */
 420         gtk_drag_finish (context, FALSE, FALSE, time);
 421
 422         return;
 423     }
 424
 425     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 426
 427     /* inform the wxDropTarget about the current GtkSelectionData.
 428        this is only valid for the duration of this call */
 429     drop_target->SetDragData( data );
 430
 431     wxDragResult result = ConvertFromGTK(context->action);
 432
 433     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 434     {
 435         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned TRUE") );
 436
 437         /* tell GTK that data transfer was successful */
 438         gtk_drag_finish( context, TRUE, FALSE, time );
 439     }
 440     else
 441     {
 442         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 443
 444         /* tell GTK that data transfer was not successful */
 445         gtk_drag_finish( context, FALSE, FALSE, time );
 446     }
 447
 448     /* after this, invalidate the drop_target's drag data */
 449     drop_target->SetDragData( (GtkSelectionData*) NULL );
 450 }
 451 }
 452
 453 //----------------------------------------------------------------------------
 454 // wxDropTarget
 455 //----------------------------------------------------------------------------
 456
 457 wxDropTarget::wxDropTarget( wxDataObject *data )
 458             : wxDropTargetBase( data )
 459 {
 460     m_firstMotion = true;
 461     m_dragContext = (GdkDragContext*) NULL;
 462     m_dragWidget = (GtkWidget*) NULL;
 463     m_dragData = (GtkSelectionData*) NULL;
 464     m_dragTime = 0;
 465 }
 466
 467 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 468                                        wxCoord WXUNUSED(y),
 469                                        wxDragResult def )
 470 {
 471     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 472
 473     // disable the debug message from GetMatchingPair() - there are too many
 474     // of them otherwise
 475 #ifdef __WXDEBUG__
 476     wxLogNull noLog;
 477 #endif // Debug
 478
 479     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 480 }
 481
 482 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 483 {
 484     if (!m_dataObject)
 485         return false;
 486
 487     return (GetMatchingPair() != (GdkAtom) 0);
 488 }
 489
 490 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 491                                    wxDragResult def )
 492 {
 493     if (!m_dataObject)
 494         return wxDragNone;
 495
 496     if (GetMatchingPair() == (GdkAtom) 0)
 497         return wxDragNone;
 498
 499     return GetData() ? def : wxDragNone;
 500 }
 501
 502 GdkAtom wxDropTarget::GetMatchingPair()
 503 {
 504     if (!m_dataObject)
 505         return (GdkAtom) 0;
 506
 507     if (!m_dragContext)
 508         return (GdkAtom) 0;
 509
 510     GList *child = m_dragContext->targets;
 511     while (child)
 512     {
 513         GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
 514         wxDataFormat format( formatAtom );
 515
 516 #ifdef __WXDEBUG__
 517         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 518                    format.GetId().c_str());
 519 #endif // Debug
 520
 521         if (m_dataObject->IsSupportedFormat( format ))
 522             return formatAtom;
 523
 524         child = child->next;
 525     }
 526
 527     return (GdkAtom) 0;
 528 }
 529
 530 bool wxDropTarget::GetData()
 531 {
 532     if (!m_dragData)
 533         return false;
 534
 535     if (!m_dataObject)
 536         return false;
 537
 538     wxDataFormat dragFormat( m_dragData->target );
 539
 540     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 541         return false;
 542
 543     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 544
 545     return true;
 546 }
 547
 548 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 549 {
 550     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 551
 552     gtk_drag_dest_unset( widget );
 553
 554     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 555                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 556
 557     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 558                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 559
 560     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 561                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 562
 563     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 564                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 565 }
 566
 567 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 568 {
 569     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 570
 571     /* gtk_drag_dest_set() determines what default behaviour we'd like
 572        GTK to supply. we don't want to specify out targets (=formats)
 573        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 574        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 575        "drag_motion" and "drag_drop" events. this makes it possible
 576        to allow dropping on only a small area. we should set
 577        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 578        highlighting if dragging over standard controls, but this
 579        seems to be broken without the other two. */
 580
 581     gtk_drag_dest_set( widget,
 582                        (GtkDestDefaults) 0,         /* no default behaviour */
 583                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 584                        0,                           /* number of targets = 0 */
 585                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 586
 587     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 588                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 589
 590     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 591                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 592
 593     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 594                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 595
 596     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 597                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 598 }
 599
 600 //----------------------------------------------------------------------------
 601 // "drag_data_get"
 602 //----------------------------------------------------------------------------
 603
 604 extern "C" {
 605 static void
 606 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 607                        GdkDragContext     *WXUNUSED(context),
 608                        GtkSelectionData   *selection_data,
 609                        guint               WXUNUSED(info),
 610                        guint               WXUNUSED(time),
 611                        wxDropSource       *drop_source )
 612 {
 613     if (g_isIdle) wxapp_install_idle_handler();
 614
 615     wxDataFormat format( selection_data->target );
 616
 617     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 618                format.GetId().c_str());
 619
 620     drop_source->m_retValue = wxDragCancel;
 621
 622     wxDataObject *data = drop_source->GetDataObject();
 623
 624     if (!data)
 625     {
 626         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 627         return;
 628     }
 629
 630     if (!data->IsSupportedFormat(format))
 631     {
 632         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 633         return;
 634     }
 635
 636     if (data->GetDataSize(format) == 0)
 637     {
 638         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 639         return;
 640     }
 641
 642     size_t size = data->GetDataSize(format);
 643
 644 //  printf( "data size: %d.\n", (int)data_size );
 645
 646     guchar *d = new guchar[size];
 647
 648     if (!data->GetDataHere( format, (void*)d ))
 649     {
 650         delete[] d;
 651         return;
 652     }
 653
 654 #if wxUSE_THREADS
 655     /* disable GUI threads */
 656 #endif
 657
 658     gtk_selection_data_set( selection_data,
 659                             selection_data->target,
 660                             8,   // 8-bit
 661                             d,
 662                             size );
 663
 664 #if wxUSE_THREADS
 665     /* enable GUI threads */
 666 #endif
 667
 668     delete[] d;
 669 }
 670 }
 671
 672 //----------------------------------------------------------------------------
 673 // "drag_data_delete"
 674 //----------------------------------------------------------------------------
 675
 676 extern "C" {
 677 static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
 678                                      GdkDragContext *context,
 679                                      wxDropSource *WXUNUSED(drop_source) )
 680 {
 681     if (g_isIdle)
 682         wxapp_install_idle_handler();
 683
 684     // printf( "Drag source: drag_data_delete\n" );
 685 }
 686 }
 687
 688 //----------------------------------------------------------------------------
 689 // "drag_begin"
 690 //----------------------------------------------------------------------------
 691
 692 extern "C" {
 693 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 694                                GdkDragContext     *WXUNUSED(context),
 695                                wxDropSource       *WXUNUSED(drop_source) )
 696 {
 697     if (g_isIdle)
 698         wxapp_install_idle_handler();
 699
 700     // printf( "Drag source: drag_begin.\n" );
 701 }
 702 }
 703
 704 //----------------------------------------------------------------------------
 705 // "drag_end"
 706 //----------------------------------------------------------------------------
 707
 708 extern "C" {
 709 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 710                              GdkDragContext     *WXUNUSED(context),
 711                              wxDropSource       *drop_source )
 712 {
 713     if (g_isIdle) wxapp_install_idle_handler();
 714
 715     // printf( "Drag source: drag_end.\n" );
 716
 717     drop_source->m_waiting = false;
 718 }
 719 }
 720
 721 //-----------------------------------------------------------------------------
 722 // "configure_event" from m_iconWindow
 723 //-----------------------------------------------------------------------------
 724
 725 extern "C" {
 726 static gint
 727 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 728 {
 729     if (g_isIdle)
 730         wxapp_install_idle_handler();
 731
 732     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 733
 734     return 0;
 735 }
 736 }
 737
 738 //---------------------------------------------------------------------------
 739 // wxDropSource
 740 //---------------------------------------------------------------------------
 741
 742 wxDropSource::wxDropSource(wxWindow *win,
 743                            const wxIcon &iconCopy,
 744                            const wxIcon &iconMove,
 745                            const wxIcon &iconNone)
 746 {
 747     m_waiting = true;
 748
 749     m_iconWindow = (GtkWidget*) NULL;
 750
 751     m_window = win;
 752     m_widget = win->m_widget;
 753     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 754
 755     m_retValue = wxDragCancel;
 756
 757     SetIcons(iconCopy, iconMove, iconNone);
 758 }
 759
 760 wxDropSource::wxDropSource(wxDataObject& data,
 761                            wxWindow *win,
 762                            const wxIcon &iconCopy,
 763                            const wxIcon &iconMove,
 764                            const wxIcon &iconNone)
 765 {
 766     m_waiting = true;
 767
 768     SetData( data );
 769
 770     m_iconWindow = (GtkWidget*) NULL;
 771
 772     m_window = win;
 773     m_widget = win->m_widget;
 774     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 775
 776     m_retValue = wxDragCancel;
 777
 778     SetIcons(iconCopy, iconMove, iconNone);
 779 }
 780
 781 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 782                             const wxIcon &iconMove,
 783                             const wxIcon &iconNone)
 784 {
 785     m_iconCopy = iconCopy;
 786     m_iconMove = iconMove;
 787     m_iconNone = iconNone;
 788
 789     if ( !m_iconCopy.Ok() )
 790         m_iconCopy = wxIcon(page_xpm);
 791     if ( !m_iconMove.Ok() )
 792         m_iconMove = m_iconCopy;
 793     if ( !m_iconNone.Ok() )
 794         m_iconNone = m_iconCopy;
 795 }
 796
 797 wxDropSource::~wxDropSource()
 798 {
 799 }
 800
 801 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 802 {
 803     // get the right icon to display
 804     wxIcon *icon = NULL;
 805     if ( action & GDK_ACTION_MOVE )
 806         icon = &m_iconMove;
 807     else if ( action & GDK_ACTION_COPY )
 808         icon = &m_iconCopy;
 809     else
 810         icon = &m_iconNone;
 811
 812     GdkBitmap *mask;
 813     if ( icon->GetMask() )
 814         mask = icon->GetMask()->GetBitmap();
 815     else
 816         mask = (GdkBitmap *)NULL;
 817
 818     GdkPixmap *pixmap = icon->GetPixmap();
 819
 820     gint width,height;
 821     gdk_window_get_size (pixmap, &width, &height);
 822
 823     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 824 #ifndef __WXGTK20__
 825     gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
 826 #endif
 827     gtk_widget_push_colormap (colormap);
 828
 829     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 830     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 831     gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
 832
 833 #ifndef __WXGTK20__
 834     gtk_widget_pop_visual ();
 835 #endif
 836     gtk_widget_pop_colormap ();
 837
 838     gtk_widget_set_usize (m_iconWindow, width, height);
 839     gtk_widget_realize (m_iconWindow);
 840
 841     gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
 842         GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
 843
 844     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 845
 846     if (mask)
 847         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 848
 849     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 850 }
 851
 852 wxDragResult wxDropSource::DoDragDrop(int flags)
 853 {
 854     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 855                  wxT("Drop source: no data") );
 856
 857     // still in drag
 858     if (g_blockEventsOnDrag)
 859         return wxDragNone;
 860
 861     // disabled for now
 862     g_blockEventsOnDrag = true;
 863
 864     RegisterWindow();
 865
 866     m_waiting = true;
 867
 868     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 869
 870     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 871     m_data->GetAllFormats( array );
 872     size_t count = m_data->GetFormatCount();
 873     for (size_t i = 0; i < count; i++)
 874     {
 875         GdkAtom atom = array[i];
 876         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 877         gtk_target_list_add( target_list, atom, 0, 0 );
 878     }
 879     delete[] array;
 880
 881     GdkEventMotion event;
 882     event.window = m_widget->window;
 883     int x = 0;
 884     int y = 0;
 885     GdkModifierType state;
 886     gdk_window_get_pointer( event.window, &x, &y, &state );
 887     event.x = x;
 888     event.y = y;
 889     event.state = state;
 890     event.time = (guint32)GDK_CURRENT_TIME;
 891
 892     /* GTK wants to know which button was pressed which caused the dragging */
 893     int button_number = 0;
 894     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 895     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 896     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 897
 898 #if wxUSE_THREADS
 899     /* disable GUI threads */
 900 #endif
 901
 902     /* don't start dragging if no button is down */
 903     if (button_number)
 904     {
 905         int action = GDK_ACTION_COPY;
 906         if ( flags & wxDrag_AllowMove )
 907             action |= GDK_ACTION_MOVE;
 908
 909         // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 910         //     to use a global to pass the flags to the drop target but I'd
 911         //     surely prefer a better way to do it
 912         gs_flagsForDrag = flags;
 913
 914         GdkDragContext *context = gtk_drag_begin( m_widget,
 915                 target_list,
 916                 (GdkDragAction)action,
 917                 button_number,  /* number of mouse button which started drag */
 918                 (GdkEvent*) &event );
 919
 920         m_dragContext = context;
 921
 922         PrepareIcon( action, context );
 923
 924         while (m_waiting)
 925             gtk_main_iteration();
 926
 927         m_retValue = ConvertFromGTK(context->action);
 928         if ( m_retValue == wxDragNone )
 929             m_retValue = wxDragCancel;
 930     }
 931
 932 #if wxUSE_THREADS
 933     /* re-enable GUI threads */
 934 #endif
 935
 936     g_blockEventsOnDrag = false;
 937
 938     UnregisterWindow();
 939
 940     return m_retValue;
 941 }
 942
 943 void wxDropSource::RegisterWindow()
 944 {
 945     if (!m_widget) return;
 946
 947     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 948                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 949     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 950                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 951     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 952                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 953     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 954                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 955
 956 }
 957
 958 void wxDropSource::UnregisterWindow()
 959 {
 960     if (!m_widget) return;
 961
 962     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 963                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 964     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 965                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 966     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 967                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 968     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 969                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 970 }
 971
 972 #endif
 973       // wxUSE_DRAG_AND_DROP