src/gtk/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 #ifdef __GNUG__
  11     #pragma implementation "dnd.h"
  12 #endif
  13
  14 #include "wx/dnd.h"
  15
  16 #if wxUSE_DRAG_AND_DROP
  17
  18 #include "wx/window.h"
  19 #include "wx/app.h"
  20 #include "wx/gdicmn.h"
  21 #include "wx/intl.h"
  22 #include "wx/utils.h"
  23
  24 #include "wx/gtk/private.h"
  25
  26 #include <gdk/gdkprivate.h>
  27
  28 #include <gtk/gtkdnd.h>
  29 #include <gtk/gtkselection.h>
  30
  31 //-----------------------------------------------------------------------------
  32 // idle system
  33 //-----------------------------------------------------------------------------
  34
  35 extern void wxapp_install_idle_handler();
  36 extern bool g_isIdle;
  37
  38 //-----------------------------------------------------------------------------
  39 // thread system
  40 //-----------------------------------------------------------------------------
  41
  42 #if wxUSE_THREADS
  43 #endif
  44
  45 //----------------------------------------------------------------------------
  46 // global data
  47 //----------------------------------------------------------------------------
  48
  49 extern bool g_blockEventsOnDrag;
  50
  51 // the flags used for the last DoDragDrop()
  52 static long gs_flagsForDrag = 0;
  53
  54 // the trace mask we use with wxLogTrace() - call
  55 // wxLog::AddTraceMask(TRACE_DND) to enable the trace messages from here
  56 // (there are quite a few of them, so don't enable this by default)
  57 static const wxChar *TRACE_DND = _T("dnd");
  58
  59 //----------------------------------------------------------------------------
  60 // standard icons
  61 //----------------------------------------------------------------------------
  62
  63 /* XPM */
  64 static const char * page_xpm[] = {
  65 /* width height ncolors chars_per_pixel */
  66 "32 32 5 1",
  67 /* colors */
  68 "         s None        c None",
  69 ".        c black",
  70 "X        c wheat",
  71 "o        c tan",
  72 "O        c #6699FF",
  73 /* pixels */
  74 "    ...................         ",
  75 "    .XXXXXXXXXXXXXXXXX..        ",
  76 "    .XXXXXXXXXXXXXXXXX.o.       ",
  77 "    .XXXXXXXXXXXXXXXXX.oo.      ",
  78 "    .XXXXXXXXXXXXXXXXX.ooo.     ",
  79 "    .XXXXXXXXXXXXXXXXX.oooo.    ",
  80 "    .XXXXXXXXXXXXXXXXX.......   ",
  81 "    .XXXXXOOOOOOOOOOXXXooooo.   ",
  82 "    .XXXXXXXXXXXXXXXXXXooooo.   ",
  83 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
  84 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  85 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
  86 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  87 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
  88 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  89 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
  90 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  91 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
  92 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  93 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
  94 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  95 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
  96 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  97 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
  98 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  99 "    .XXXXXOOOOOOOXXXXXXXXXXX.   ",
 100 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 101 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 102 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 103 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 104 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 105 "    .........................   "};
 106
 107
 108 // ============================================================================
 109 // private functions
 110 // ============================================================================
 111
 112 // ----------------------------------------------------------------------------
 113 // convert between GTK+ and wxWindows DND constants
 114 // ----------------------------------------------------------------------------
 115
 116 static wxDragResult ConvertFromGTK(long action)
 117 {
 118     switch ( action )
 119     {
 120         case GDK_ACTION_COPY:
 121             return wxDragCopy;
 122
 123         case GDK_ACTION_LINK:
 124             return wxDragLink;
 125
 126         case GDK_ACTION_MOVE:
 127             return wxDragMove;
 128     }
 129
 130     return wxDragNone;
 131 }
 132
 133 // ----------------------------------------------------------------------------
 134 // "drag_leave"
 135 // ----------------------------------------------------------------------------
 136
 137 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 138                                GdkDragContext *context,
 139                                guint WXUNUSED(time),
 140                                wxDropTarget *drop_target )
 141 {
 142     if (g_isIdle) wxapp_install_idle_handler();
 143
 144     /* inform the wxDropTarget about the current GdkDragContext.
 145        this is only valid for the duration of this call */
 146     drop_target->SetDragContext( context );
 147
 148     /* we don't need return values. this event is just for
 149        information */
 150     drop_target->OnLeave();
 151
 152     /* this has to be done because GDK has no "drag_enter" event */
 153     drop_target->m_firstMotion = TRUE;
 154
 155     /* after this, invalidate the drop_target's GdkDragContext */
 156     drop_target->SetDragContext( (GdkDragContext*) NULL );
 157 }
 158
 159 // ----------------------------------------------------------------------------
 160 // "drag_motion"
 161 // ----------------------------------------------------------------------------
 162
 163 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 164                                     GdkDragContext *context,
 165                                     gint x,
 166                                     gint y,
 167                                     guint time,
 168                                     wxDropTarget *drop_target )
 169 {
 170     if (g_isIdle) wxapp_install_idle_handler();
 171
 172     /* Owen Taylor: "if the coordinates not in a drop zone,
 173        return FALSE, otherwise call gtk_drag_status() and
 174        return TRUE" */
 175
 176     /* inform the wxDropTarget about the current GdkDragContext.
 177        this is only valid for the duration of this call */
 178     drop_target->SetDragContext( context );
 179
 180     // GTK+ always supposes that we want to copy the data by default while we
 181     // might want to move it, so examine not only suggested_action - which is
 182     // only good if we don't have our own preferences - but also the actions
 183     // field
 184     wxDragResult result;
 185     if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 186             (context->actions & GDK_ACTION_MOVE ) )
 187     {
 188         // move is requested by the program and allowed by GTK+ - do it, even
 189         // though suggested_action may be currently wxDragCopy
 190         result = wxDragMove;
 191     }
 192     else // use whatever GTK+ says we should
 193     {
 194         result = ConvertFromGTK(context->suggested_action);
 195
 196         if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 197         {
 198             // we're requested to move but we can't
 199             result = wxDragCopy;
 200         }
 201     }
 202
 203     if (drop_target->m_firstMotion)
 204     {
 205         /* the first "drag_motion" event substitutes a "drag_enter" event */
 206         result = drop_target->OnEnter( x, y, result );
 207     }
 208     else
 209     {
 210         /* give program a chance to react (i.e. to say no by returning FALSE) */
 211         result = drop_target->OnDragOver( x, y, result );
 212     }
 213
 214     bool ret = wxIsDragResultOk( result );
 215     if (ret)
 216     {
 217         GdkDragAction action;
 218         if (result == wxDragCopy)
 219             action = GDK_ACTION_COPY;
 220         else if (result == wxDragLink)
 221             action = GDK_ACTION_LINK;
 222         else
 223             action = GDK_ACTION_MOVE;
 224
 225         gdk_drag_status( context, action, time );
 226     }
 227
 228     /* after this, invalidate the drop_target's GdkDragContext */
 229     drop_target->SetDragContext( (GdkDragContext*) NULL );
 230
 231     /* this has to be done because GDK has no "drag_enter" event */
 232     drop_target->m_firstMotion = FALSE;
 233
 234     return ret;
 235 }
 236
 237 // ----------------------------------------------------------------------------
 238 // "drag_drop"
 239 // ----------------------------------------------------------------------------
 240
 241 static gboolean target_drag_drop( GtkWidget *widget,
 242                                   GdkDragContext *context,
 243                                   gint x,
 244                                   gint y,
 245                                   guint time,
 246                                   wxDropTarget *drop_target )
 247 {
 248     if (g_isIdle) wxapp_install_idle_handler();
 249
 250     /* Owen Taylor: "if the drop is not in a drop zone,
 251        return FALSE, otherwise, if you aren't accepting
 252        the drop, call gtk_drag_finish() with success == FALSE
 253        otherwise call gtk_drag_data_get()" */
 254
 255 //    printf( "drop.\n" );
 256
 257     /* this seems to make a difference between not accepting
 258        due to wrong target area and due to wrong format. let
 259        us hope that this is not required.. */
 260
 261     /* inform the wxDropTarget about the current GdkDragContext.
 262        this is only valid for the duration of this call */
 263     drop_target->SetDragContext( context );
 264
 265     /* inform the wxDropTarget about the current drag widget.
 266        this is only valid for the duration of this call */
 267     drop_target->SetDragWidget( widget );
 268
 269     /* inform the wxDropTarget about the current drag time.
 270        this is only valid for the duration of this call */
 271     drop_target->SetDragTime( time );
 272
 273 /*
 274     wxDragResult result = wxDragMove;
 275     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 276 */
 277
 278     /* reset the block here as someone might very well
 279        show a dialog as a reaction to a drop and this
 280        wouldn't work without events */
 281     g_blockEventsOnDrag = FALSE;
 282
 283     bool ret = drop_target->OnDrop( x, y );
 284
 285     if (!ret)
 286     {
 287         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 288
 289         /* cancel the whole thing */
 290         gtk_drag_finish( context,
 291                           FALSE,        /* no success */
 292                           FALSE,        /* don't delete data on dropping side */
 293                           time );
 294     }
 295     else
 296     {
 297         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned TRUE") );
 298
 299 #if wxUSE_THREADS
 300         /* disable GUI threads */
 301 #endif
 302
 303         GdkAtom format = drop_target->GetMatchingPair();
 304         wxASSERT( format );
 305
 306 /*
 307         GdkDragAction action = GDK_ACTION_MOVE;
 308         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 309         context->action = action;
 310 */
 311         /* this should trigger an "drag_data_received" event */
 312         gtk_drag_get_data( widget,
 313                            context,
 314                            format,
 315                            time );
 316
 317 #if wxUSE_THREADS
 318         /* re-enable GUI threads */
 319 #endif
 320     }
 321
 322     /* after this, invalidate the drop_target's GdkDragContext */
 323     drop_target->SetDragContext( (GdkDragContext*) NULL );
 324
 325     /* after this, invalidate the drop_target's drag widget */
 326     drop_target->SetDragWidget( (GtkWidget*) NULL );
 327
 328     /* this has to be done because GDK has no "drag_enter" event */
 329     drop_target->m_firstMotion = TRUE;
 330
 331     return ret;
 332 }
 333
 334 // ----------------------------------------------------------------------------
 335 // "drag_data_received"
 336 // ----------------------------------------------------------------------------
 337
 338 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 339                                        GdkDragContext *context,
 340                                        gint x,
 341                                        gint y,
 342                                        GtkSelectionData *data,
 343                                        guint WXUNUSED(info),
 344                                        guint time,
 345                                        wxDropTarget *drop_target )
 346 {
 347     if (g_isIdle) wxapp_install_idle_handler();
 348
 349     /* Owen Taylor: "call gtk_drag_finish() with
 350        success == TRUE" */
 351
 352     if ((data->length <= 0) || (data->format != 8))
 353     {
 354         /* negative data length and non 8-bit data format
 355            qualifies for junk */
 356         gtk_drag_finish (context, FALSE, FALSE, time);
 357
 358         return;
 359     }
 360
 361     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 362
 363     /* inform the wxDropTarget about the current GtkSelectionData.
 364        this is only valid for the duration of this call */
 365     drop_target->SetDragData( data );
 366
 367     wxDragResult result = ConvertFromGTK(context->suggested_action);
 368
 369     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 370     {
 371         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned TRUE") );
 372
 373         /* tell GTK that data transfer was successfull */
 374         gtk_drag_finish( context, TRUE, FALSE, time );
 375     }
 376     else
 377     {
 378         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 379
 380         /* tell GTK that data transfer was not successfull */
 381         gtk_drag_finish( context, FALSE, FALSE, time );
 382     }
 383
 384     /* after this, invalidate the drop_target's drag data */
 385     drop_target->SetDragData( (GtkSelectionData*) NULL );
 386 }
 387
 388 //----------------------------------------------------------------------------
 389 // wxDropTarget
 390 //----------------------------------------------------------------------------
 391
 392 wxDropTarget::wxDropTarget( wxDataObject *data )
 393             : wxDropTargetBase( data )
 394 {
 395     m_firstMotion = TRUE;
 396     m_dragContext = (GdkDragContext*) NULL;
 397     m_dragWidget = (GtkWidget*) NULL;
 398     m_dragData = (GtkSelectionData*) NULL;
 399     m_dragTime = 0;
 400 }
 401
 402 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 403                                        wxCoord WXUNUSED(y),
 404                                        wxDragResult def )
 405 {
 406     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 407
 408     // disable the debug message from GetMatchingPair() - there are too many
 409     // of them otherwise
 410 #ifdef __WXDEBUG__
 411     wxLogNull noLog;
 412 #endif // Debug
 413
 414     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 415 }
 416
 417 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 418 {
 419     if (!m_dataObject)
 420         return FALSE;
 421
 422     return (GetMatchingPair() != (GdkAtom) 0);
 423 }
 424
 425 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 426                                    wxDragResult def )
 427 {
 428     if (!m_dataObject)
 429         return wxDragNone;
 430
 431     if (GetMatchingPair() == (GdkAtom) 0)
 432         return wxDragNone;
 433
 434     return GetData() ? def : wxDragNone;
 435 }
 436
 437 GdkAtom wxDropTarget::GetMatchingPair()
 438 {
 439     if (!m_dataObject)
 440         return (GdkAtom) 0;
 441
 442     if (!m_dragContext)
 443         return (GdkAtom) 0;
 444
 445     GList *child = m_dragContext->targets;
 446     while (child)
 447     {
 448         GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
 449         wxDataFormat format( formatAtom );
 450
 451 #ifdef __WXDEBUG__
 452         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 453                    format.GetId().c_str());
 454 #endif // Debug
 455
 456         if (m_dataObject->IsSupportedFormat( format ))
 457             return formatAtom;
 458
 459         child = child->next;
 460     }
 461
 462     return (GdkAtom) 0;
 463 }
 464
 465 bool wxDropTarget::GetData()
 466 {
 467     if (!m_dragData)
 468         return FALSE;
 469
 470     if (!m_dataObject)
 471         return FALSE;
 472
 473     wxDataFormat dragFormat( m_dragData->target );
 474
 475     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 476         return FALSE;
 477
 478     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 479
 480     return TRUE;
 481 }
 482
 483 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 484 {
 485     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 486
 487     gtk_drag_dest_unset( widget );
 488
 489     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 490                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 491
 492     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 493                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 494
 495     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 496                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 497
 498     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 499                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 500 }
 501
 502 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 503 {
 504     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 505
 506     /* gtk_drag_dest_set() determines what default behaviour we'd like
 507        GTK to supply. we don't want to specify out targets (=formats)
 508        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 509        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 510        "drag_motion" and "drag_drop" events. this makes it possible
 511        to allow dropping on only a small area. we should set
 512        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 513        highlighting if dragging over standard controls, but this
 514        seems to be broken without the other two. */
 515
 516     gtk_drag_dest_set( widget,
 517                        (GtkDestDefaults) 0,         /* no default behaviour */
 518                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 519                        0,                           /* number of targets = 0 */
 520                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 521
 522     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 523                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 524
 525     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 526                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 527
 528     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 529                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 530
 531     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 532                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 533 }
 534
 535 //----------------------------------------------------------------------------
 536 // "drag_data_get"
 537 //----------------------------------------------------------------------------
 538
 539 static void
 540 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 541                        GdkDragContext     *WXUNUSED(context),
 542                        GtkSelectionData   *selection_data,
 543                        guint               WXUNUSED(info),
 544                        guint               WXUNUSED(time),
 545                        wxDropSource       *drop_source )
 546 {
 547     if (g_isIdle) wxapp_install_idle_handler();
 548
 549     wxDataFormat format( selection_data->target );
 550
 551     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 552                format.GetId().c_str());
 553
 554     drop_source->m_retValue = wxDragCancel;
 555
 556     wxDataObject *data = drop_source->GetDataObject();
 557
 558     if (!data)
 559     {
 560         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 561         return;
 562     }
 563
 564     if (!data->IsSupportedFormat(format))
 565     {
 566         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 567         return;
 568     }
 569
 570     if (data->GetDataSize(format) == 0)
 571     {
 572         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 573         return;
 574     }
 575
 576     size_t size = data->GetDataSize(format);
 577
 578 //  printf( "data size: %d.\n", (int)data_size );
 579
 580     guchar *d = new guchar[size];
 581
 582     if (!data->GetDataHere( format, (void*)d ))
 583     {
 584         delete[] d;
 585         return;
 586     }
 587
 588 #if wxUSE_THREADS
 589     /* disable GUI threads */
 590 #endif
 591
 592                 gtk_selection_data_set( selection_data,
 593                                         selection_data->target,
 594                                         8,   // 8-bit
 595                                         d,
 596                                         size );
 597
 598 #if wxUSE_THREADS
 599     /* enable GUI threads */
 600 #endif
 601
 602     delete[] d;
 603 }
 604
 605 //----------------------------------------------------------------------------
 606 // "drag_data_delete"
 607 //----------------------------------------------------------------------------
 608
 609 static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
 610                                      GdkDragContext *context,
 611                                      wxDropSource *WXUNUSED(drop_source) )
 612 {
 613     if (g_isIdle)
 614         wxapp_install_idle_handler();
 615
 616     // printf( "Drag source: drag_data_delete\n" );
 617 }
 618
 619 //----------------------------------------------------------------------------
 620 // "drag_begin"
 621 //----------------------------------------------------------------------------
 622
 623 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 624                                GdkDragContext     *WXUNUSED(context),
 625                                wxDropSource       *WXUNUSED(drop_source) )
 626 {
 627     if (g_isIdle)
 628         wxapp_install_idle_handler();
 629
 630     // printf( "Drag source: drag_begin.\n" );
 631 }
 632
 633 //----------------------------------------------------------------------------
 634 // "drag_end"
 635 //----------------------------------------------------------------------------
 636
 637 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 638                              GdkDragContext     *WXUNUSED(context),
 639                              wxDropSource       *drop_source )
 640 {
 641     if (g_isIdle) wxapp_install_idle_handler();
 642
 643     // printf( "Drag source: drag_end.\n" );
 644
 645     drop_source->m_waiting = FALSE;
 646 }
 647
 648 //-----------------------------------------------------------------------------
 649 // "configure_event" from m_iconWindow
 650 //-----------------------------------------------------------------------------
 651
 652 static gint
 653 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 654 {
 655     if (g_isIdle)
 656         wxapp_install_idle_handler();
 657
 658     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 659
 660     return 0;
 661 }
 662
 663 //---------------------------------------------------------------------------
 664 // wxDropSource
 665 //---------------------------------------------------------------------------
 666
 667 wxDropSource::wxDropSource(wxWindow *win,
 668                            const wxIcon &iconCopy,
 669                            const wxIcon &iconMove,
 670                            const wxIcon &iconNone)
 671 {
 672     m_waiting = TRUE;
 673
 674     m_iconWindow = (GtkWidget*) NULL;
 675
 676     m_window = win;
 677     m_widget = win->m_widget;
 678     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 679
 680     m_retValue = wxDragCancel;
 681
 682     SetIcons(iconCopy, iconMove, iconNone);
 683 }
 684
 685 wxDropSource::wxDropSource(wxDataObject& data,
 686                            wxWindow *win,
 687                            const wxIcon &iconCopy,
 688                            const wxIcon &iconMove,
 689                            const wxIcon &iconNone)
 690 {
 691     m_waiting = TRUE;
 692
 693     SetData( data );
 694
 695     m_iconWindow = (GtkWidget*) NULL;
 696
 697     m_window = win;
 698     m_widget = win->m_widget;
 699     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 700
 701     m_retValue = wxDragCancel;
 702
 703     SetIcons(iconCopy, iconMove, iconNone);
 704 }
 705
 706 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 707                             const wxIcon &iconMove,
 708                             const wxIcon &iconNone)
 709 {
 710     m_iconCopy = iconCopy;
 711     m_iconMove = iconMove;
 712     m_iconNone = iconNone;
 713
 714     if ( !m_iconCopy.Ok() )
 715         m_iconCopy = wxIcon(page_xpm);
 716     if ( !m_iconMove.Ok() )
 717         m_iconMove = m_iconCopy;
 718     if ( !m_iconNone.Ok() )
 719         m_iconNone = m_iconCopy;
 720 }
 721
 722 wxDropSource::~wxDropSource()
 723 {
 724 }
 725
 726 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 727 {
 728     // get the right icon to display
 729     wxIcon *icon = NULL;
 730     if ( action & GDK_ACTION_MOVE )
 731         icon = &m_iconMove;
 732     else if ( action & GDK_ACTION_COPY )
 733         icon = &m_iconCopy;
 734     else
 735         icon = &m_iconNone;
 736
 737     GdkBitmap *mask;
 738     if ( icon->GetMask() )
 739         mask = icon->GetMask()->GetBitmap();
 740     else
 741         mask = (GdkBitmap *)NULL;
 742
 743     GdkPixmap *pixmap = icon->GetPixmap();
 744
 745     gint width,height;
 746     gdk_window_get_size (pixmap, &width, &height);
 747
 748     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 749 #ifndef __WXGTK20__
 750     gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
 751 #endif
 752     gtk_widget_push_colormap (colormap);
 753
 754     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 755     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 756     gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
 757
 758 #ifndef __WXGTK20__
 759     gtk_widget_pop_visual ();
 760 #endif
 761     gtk_widget_pop_colormap ();
 762
 763     gtk_widget_set_usize (m_iconWindow, width, height);
 764     gtk_widget_realize (m_iconWindow);
 765
 766     gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
 767         GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
 768
 769     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 770
 771     if (mask)
 772         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 773
 774     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 775 }
 776
 777 wxDragResult wxDropSource::DoDragDrop(int flags)
 778 {
 779     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 780                  wxT("Drop source: no data") );
 781
 782     // still in drag
 783     if (g_blockEventsOnDrag)
 784         return wxDragNone;
 785
 786     // disabled for now
 787     g_blockEventsOnDrag = TRUE;
 788
 789     RegisterWindow();
 790
 791     m_waiting = TRUE;
 792
 793     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 794
 795     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 796     m_data->GetAllFormats( array );
 797     size_t count = m_data->GetFormatCount();
 798     for (size_t i = 0; i < count; i++)
 799     {
 800         GdkAtom atom = array[i];
 801         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 802         gtk_target_list_add( target_list, atom, 0, 0 );
 803     }
 804     delete[] array;
 805
 806     GdkEventMotion event;
 807     event.window = m_widget->window;
 808     int x = 0;
 809     int y = 0;
 810     GdkModifierType state;
 811     gdk_window_get_pointer( event.window, &x, &y, &state );
 812     event.x = x;
 813     event.y = y;
 814     event.state = state;
 815     event.time = (guint32)GDK_CURRENT_TIME;
 816
 817     /* GTK wants to know which button was pressed which caused the dragging */
 818     int button_number = 0;
 819     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 820     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 821     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 822
 823 #if wxUSE_THREADS
 824     /* disable GUI threads */
 825 #endif
 826
 827     /* don't start dragging if no button is down */
 828     if (button_number)
 829     {
 830         int action = GDK_ACTION_COPY;
 831         if ( flags & wxDrag_AllowMove )
 832             action |= GDK_ACTION_MOVE;
 833
 834         // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 835         //     to use a global to pass the flags to the drop target but I'd
 836         //     surely prefer a better way to do it
 837         gs_flagsForDrag = flags;
 838
 839         GdkDragContext *context = gtk_drag_begin( m_widget,
 840                 target_list,
 841                 (GdkDragAction)action,
 842                 button_number,  /* number of mouse button which started drag */
 843                 (GdkEvent*) &event );
 844
 845         m_dragContext = context;
 846
 847         PrepareIcon( action, context );
 848
 849         while (m_waiting)
 850             gtk_main_iteration();
 851
 852         m_retValue = ConvertFromGTK(context->action);
 853         if ( m_retValue == wxDragNone )
 854             m_retValue = wxDragCancel;
 855     }
 856
 857 #if wxUSE_THREADS
 858     /* re-enable GUI threads */
 859 #endif
 860
 861     g_blockEventsOnDrag = FALSE;
 862
 863     UnregisterWindow();
 864
 865     return m_retValue;
 866 }
 867
 868 void wxDropSource::RegisterWindow()
 869 {
 870     if (!m_widget) return;
 871
 872     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 873                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 874     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 875                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 876     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 877                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 878     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 879                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 880
 881 }
 882
 883 void wxDropSource::UnregisterWindow()
 884 {
 885     if (!m_widget) return;
 886
 887     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 888                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 889     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 890                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 891     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 892                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 893     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 894                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 895 }
 896
 897 #endif
 898       // wxUSE_DRAG_AND_DROP