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