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 #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 /* XPM */
  69 static const char * page_xpm[] = {
  70 /* width height ncolors chars_per_pixel */
  71 "32 32 5 1",
  72 /* colors */
  73 "         s None        c None",
  74 ".        c black",
  75 "X        c wheat",
  76 "o        c tan",
  77 "O        c #6699FF",
  78 /* pixels */
  79 "    ...................         ",
  80 "    .XXXXXXXXXXXXXXXXX..        ",
  81 "    .XXXXXXXXXXXXXXXXX.o.       ",
  82 "    .XXXXXXXXXXXXXXXXX.oo.      ",
  83 "    .XXXXXXXXXXXXXXXXX.ooo.     ",
  84 "    .XXXXXXXXXXXXXXXXX.oooo.    ",
  85 "    .XXXXXXXXXXXXXXXXX.......   ",
  86 "    .XXXXXOOOOOOOOOOXXXooooo.   ",
  87 "    .XXXXXXXXXXXXXXXXXXooooo.   ",
  88 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
  89 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  90 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
  91 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  92 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
  93 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  94 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
  95 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  96 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
  97 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
  98 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
  99 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 100 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 101 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 102 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 103 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 104 "    .XXXXXOOOOOOOXXXXXXXXXXX.   ",
 105 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 106 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 107 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 108 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 109 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 110 "    .........................   "};
 111
 112
 113 // ============================================================================
 114 // private functions
 115 // ============================================================================
 116
 117 // ----------------------------------------------------------------------------
 118 // convert between GTK+ and wxWidgets DND constants
 119 // ----------------------------------------------------------------------------
 120
 121 static wxDragResult ConvertFromGTK(long action)
 122 {
 123     switch ( action )
 124     {
 125         case GDK_ACTION_COPY:
 126             return wxDragCopy;
 127
 128         case GDK_ACTION_LINK:
 129             return wxDragLink;
 130
 131         case GDK_ACTION_MOVE:
 132             return wxDragMove;
 133     }
 134
 135     return wxDragNone;
 136 }
 137
 138 // ----------------------------------------------------------------------------
 139 // "drag_leave"
 140 // ----------------------------------------------------------------------------
 141
 142 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 143                                GdkDragContext *context,
 144                                guint WXUNUSED(time),
 145                                wxDropTarget *drop_target )
 146 {
 147     if (g_isIdle) wxapp_install_idle_handler();
 148
 149     /* inform the wxDropTarget about the current GdkDragContext.
 150        this is only valid for the duration of this call */
 151     drop_target->SetDragContext( context );
 152
 153     /* we don't need return values. this event is just for
 154        information */
 155     drop_target->OnLeave();
 156
 157     /* this has to be done because GDK has no "drag_enter" event */
 158     drop_target->m_firstMotion = TRUE;
 159
 160     /* after this, invalidate the drop_target's GdkDragContext */
 161     drop_target->SetDragContext( (GdkDragContext*) NULL );
 162 }
 163
 164 // ----------------------------------------------------------------------------
 165 // "drag_motion"
 166 // ----------------------------------------------------------------------------
 167
 168 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 169                                     GdkDragContext *context,
 170                                     gint x,
 171                                     gint y,
 172                                     guint time,
 173                                     wxDropTarget *drop_target )
 174 {
 175     if (g_isIdle) wxapp_install_idle_handler();
 176
 177     /* Owen Taylor: "if the coordinates not in a drop zone,
 178        return FALSE, otherwise call gtk_drag_status() and
 179        return TRUE" */
 180
 181     /* inform the wxDropTarget about the current GdkDragContext.
 182        this is only valid for the duration of this call */
 183     drop_target->SetDragContext( context );
 184
 185     // GTK+ always supposes that we want to copy the data by default while we
 186     // might want to move it, so examine not only suggested_action - which is
 187     // only good if we don't have our own preferences - but also the actions
 188     // field
 189     wxDragResult result;
 190     if ( (gs_flagsForDrag & wxDrag_DefaultMove) == wxDrag_DefaultMove &&
 191             (context->actions & GDK_ACTION_MOVE ) )
 192     {
 193         // move is requested by the program and allowed by GTK+ - do it, even
 194         // though suggested_action may be currently wxDragCopy
 195         result = wxDragMove;
 196     }
 197     else // use whatever GTK+ says we should
 198     {
 199         result = ConvertFromGTK(context->suggested_action);
 200
 201         if ( (result == wxDragMove) && !(gs_flagsForDrag & wxDrag_AllowMove) )
 202         {
 203             // we're requested to move but we can't
 204             result = wxDragCopy;
 205         }
 206     }
 207
 208     if (drop_target->m_firstMotion)
 209     {
 210         /* the first "drag_motion" event substitutes a "drag_enter" event */
 211         result = drop_target->OnEnter( x, y, result );
 212     }
 213     else
 214     {
 215         /* give program a chance to react (i.e. to say no by returning FALSE) */
 216         result = drop_target->OnDragOver( x, y, result );
 217     }
 218
 219     bool ret = wxIsDragResultOk( result );
 220     if (ret)
 221     {
 222         GdkDragAction action;
 223         if ((result == wxDragCopy) && (context->actions & GDK_ACTION_COPY) ||
 224             (result == wxDragMove) && !(context->actions & GDK_ACTION_MOVE) ||
 225             (result == wxDragLink) && !(context->actions & GDK_ACTION_LINK))
 226             action = GDK_ACTION_COPY;
 227         else if (result == wxDragLink)
 228             action = GDK_ACTION_LINK;
 229         else
 230             action = GDK_ACTION_MOVE;
 231
 232         gdk_drag_status( context, action, time );
 233     }
 234
 235     /* after this, invalidate the drop_target's GdkDragContext */
 236     drop_target->SetDragContext( (GdkDragContext*) NULL );
 237
 238     /* this has to be done because GDK has no "drag_enter" event */
 239     drop_target->m_firstMotion = FALSE;
 240
 241     return ret;
 242 }
 243
 244 // ----------------------------------------------------------------------------
 245 // "drag_drop"
 246 // ----------------------------------------------------------------------------
 247
 248 static gboolean target_drag_drop( GtkWidget *widget,
 249                                   GdkDragContext *context,
 250                                   gint x,
 251                                   gint y,
 252                                   guint time,
 253                                   wxDropTarget *drop_target )
 254 {
 255     if (g_isIdle) wxapp_install_idle_handler();
 256
 257     /* Owen Taylor: "if the drop is not in a drop zone,
 258        return FALSE, otherwise, if you aren't accepting
 259        the drop, call gtk_drag_finish() with success == FALSE
 260        otherwise call gtk_drag_data_get()" */
 261
 262 //    printf( "drop.\n" );
 263
 264     /* this seems to make a difference between not accepting
 265        due to wrong target area and due to wrong format. let
 266        us hope that this is not required.. */
 267
 268     /* inform the wxDropTarget about the current GdkDragContext.
 269        this is only valid for the duration of this call */
 270     drop_target->SetDragContext( context );
 271
 272     /* inform the wxDropTarget about the current drag widget.
 273        this is only valid for the duration of this call */
 274     drop_target->SetDragWidget( widget );
 275
 276     /* inform the wxDropTarget about the current drag time.
 277        this is only valid for the duration of this call */
 278     drop_target->SetDragTime( time );
 279
 280 /*
 281     wxDragResult result = wxDragMove;
 282     if (context->suggested_action == GDK_ACTION_COPY) result = wxDragCopy;
 283 */
 284
 285     /* reset the block here as someone might very well
 286        show a dialog as a reaction to a drop and this
 287        wouldn't work without events */
 288     g_blockEventsOnDrag = FALSE;
 289
 290     bool ret = drop_target->OnDrop( x, y );
 291
 292     if (!ret)
 293     {
 294         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned FALSE") );
 295
 296         /* cancel the whole thing */
 297         gtk_drag_finish( context,
 298                           FALSE,        /* no success */
 299                           FALSE,        /* don't delete data on dropping side */
 300                           time );
 301     }
 302     else
 303     {
 304         wxLogTrace(TRACE_DND, wxT( "Drop target: OnDrop returned TRUE") );
 305
 306 #if wxUSE_THREADS
 307         /* disable GUI threads */
 308 #endif
 309
 310         GdkAtom format = drop_target->GetMatchingPair();
 311
 312         // this does happen somehow, see bug 555111
 313         wxCHECK_MSG( format, FALSE, _T("no matching GdkAtom for format?") )
 314
 315 /*
 316         GdkDragAction action = GDK_ACTION_MOVE;
 317         if (result == wxDragCopy) action == GDK_ACTION_COPY;
 318         context->action = action;
 319 */
 320         /* this should trigger an "drag_data_received" event */
 321         gtk_drag_get_data( widget,
 322                            context,
 323                            format,
 324                            time );
 325
 326 #if wxUSE_THREADS
 327         /* re-enable GUI threads */
 328 #endif
 329     }
 330
 331     /* after this, invalidate the drop_target's GdkDragContext */
 332     drop_target->SetDragContext( (GdkDragContext*) NULL );
 333
 334     /* after this, invalidate the drop_target's drag widget */
 335     drop_target->SetDragWidget( (GtkWidget*) NULL );
 336
 337     /* this has to be done because GDK has no "drag_enter" event */
 338     drop_target->m_firstMotion = TRUE;
 339
 340     return ret;
 341 }
 342
 343 // ----------------------------------------------------------------------------
 344 // "drag_data_received"
 345 // ----------------------------------------------------------------------------
 346
 347 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 348                                        GdkDragContext *context,
 349                                        gint x,
 350                                        gint y,
 351                                        GtkSelectionData *data,
 352                                        guint WXUNUSED(info),
 353                                        guint time,
 354                                        wxDropTarget *drop_target )
 355 {
 356     if (g_isIdle) wxapp_install_idle_handler();
 357
 358     /* Owen Taylor: "call gtk_drag_finish() with
 359        success == TRUE" */
 360
 361     if ((data->length <= 0) || (data->format != 8))
 362     {
 363         /* negative data length and non 8-bit data format
 364            qualifies for junk */
 365         gtk_drag_finish (context, FALSE, FALSE, time);
 366
 367         return;
 368     }
 369
 370     wxLogTrace(TRACE_DND, wxT( "Drop target: data received event") );
 371
 372     /* inform the wxDropTarget about the current GtkSelectionData.
 373        this is only valid for the duration of this call */
 374     drop_target->SetDragData( data );
 375
 376     wxDragResult result = ConvertFromGTK(context->action);
 377
 378     if ( wxIsDragResultOk( drop_target->OnData( x, y, result ) ) )
 379     {
 380         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned TRUE") );
 381
 382         /* tell GTK that data transfer was successfull */
 383         gtk_drag_finish( context, TRUE, FALSE, time );
 384     }
 385     else
 386     {
 387         wxLogTrace(TRACE_DND, wxT( "Drop target: OnData returned FALSE") );
 388
 389         /* tell GTK that data transfer was not successfull */
 390         gtk_drag_finish( context, FALSE, FALSE, time );
 391     }
 392
 393     /* after this, invalidate the drop_target's drag data */
 394     drop_target->SetDragData( (GtkSelectionData*) NULL );
 395 }
 396
 397 //----------------------------------------------------------------------------
 398 // wxDropTarget
 399 //----------------------------------------------------------------------------
 400
 401 wxDropTarget::wxDropTarget( wxDataObject *data )
 402             : wxDropTargetBase( data )
 403 {
 404     m_firstMotion = TRUE;
 405     m_dragContext = (GdkDragContext*) NULL;
 406     m_dragWidget = (GtkWidget*) NULL;
 407     m_dragData = (GtkSelectionData*) NULL;
 408     m_dragTime = 0;
 409 }
 410
 411 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 412                                        wxCoord WXUNUSED(y),
 413                                        wxDragResult def )
 414 {
 415     // GetMatchingPair() checks for m_dataObject too, no need to do it here
 416
 417     // disable the debug message from GetMatchingPair() - there are too many
 418     // of them otherwise
 419 #ifdef __WXDEBUG__
 420     wxLogNull noLog;
 421 #endif // Debug
 422
 423     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 424 }
 425
 426 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 427 {
 428     if (!m_dataObject)
 429         return FALSE;
 430
 431     return (GetMatchingPair() != (GdkAtom) 0);
 432 }
 433
 434 wxDragResult wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y),
 435                                    wxDragResult def )
 436 {
 437     if (!m_dataObject)
 438         return wxDragNone;
 439
 440     if (GetMatchingPair() == (GdkAtom) 0)
 441         return wxDragNone;
 442
 443     return GetData() ? def : wxDragNone;
 444 }
 445
 446 GdkAtom wxDropTarget::GetMatchingPair()
 447 {
 448     if (!m_dataObject)
 449         return (GdkAtom) 0;
 450
 451     if (!m_dragContext)
 452         return (GdkAtom) 0;
 453
 454     GList *child = m_dragContext->targets;
 455     while (child)
 456     {
 457         GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
 458         wxDataFormat format( formatAtom );
 459
 460 #ifdef __WXDEBUG__
 461         wxLogTrace(TRACE_DND, wxT("Drop target: drag has format: %s"),
 462                    format.GetId().c_str());
 463 #endif // Debug
 464
 465         if (m_dataObject->IsSupportedFormat( format ))
 466             return formatAtom;
 467
 468         child = child->next;
 469     }
 470
 471     return (GdkAtom) 0;
 472 }
 473
 474 bool wxDropTarget::GetData()
 475 {
 476     if (!m_dragData)
 477         return FALSE;
 478
 479     if (!m_dataObject)
 480         return FALSE;
 481
 482     wxDataFormat dragFormat( m_dragData->target );
 483
 484     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 485         return FALSE;
 486
 487     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 488
 489     return TRUE;
 490 }
 491
 492 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 493 {
 494     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 495
 496     gtk_drag_dest_unset( widget );
 497
 498     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 499                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 500
 501     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 502                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 503
 504     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 505                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 506
 507     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 508                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 509 }
 510
 511 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 512 {
 513     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 514
 515     /* gtk_drag_dest_set() determines what default behaviour we'd like
 516        GTK to supply. we don't want to specify out targets (=formats)
 517        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 518        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 519        "drag_motion" and "drag_drop" events. this makes it possible
 520        to allow dropping on only a small area. we should set
 521        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 522        highlighting if dragging over standard controls, but this
 523        seems to be broken without the other two. */
 524
 525     gtk_drag_dest_set( widget,
 526                        (GtkDestDefaults) 0,         /* no default behaviour */
 527                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 528                        0,                           /* number of targets = 0 */
 529                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 530
 531     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 532                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 533
 534     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 535                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 536
 537     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 538                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 539
 540     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 541                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 542 }
 543
 544 //----------------------------------------------------------------------------
 545 // "drag_data_get"
 546 //----------------------------------------------------------------------------
 547
 548 static void
 549 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 550                        GdkDragContext     *WXUNUSED(context),
 551                        GtkSelectionData   *selection_data,
 552                        guint               WXUNUSED(info),
 553                        guint               WXUNUSED(time),
 554                        wxDropSource       *drop_source )
 555 {
 556     if (g_isIdle) wxapp_install_idle_handler();
 557
 558     wxDataFormat format( selection_data->target );
 559
 560     wxLogTrace(TRACE_DND, wxT("Drop source: format requested: %s"),
 561                format.GetId().c_str());
 562
 563     drop_source->m_retValue = wxDragCancel;
 564
 565     wxDataObject *data = drop_source->GetDataObject();
 566
 567     if (!data)
 568     {
 569         wxLogTrace(TRACE_DND, wxT("Drop source: no data object") );
 570         return;
 571     }
 572
 573     if (!data->IsSupportedFormat(format))
 574     {
 575         wxLogTrace(TRACE_DND, wxT("Drop source: unsupported format") );
 576         return;
 577     }
 578
 579     if (data->GetDataSize(format) == 0)
 580     {
 581         wxLogTrace(TRACE_DND, wxT("Drop source: empty data") );
 582         return;
 583     }
 584
 585     size_t size = data->GetDataSize(format);
 586
 587 //  printf( "data size: %d.\n", (int)data_size );
 588
 589     guchar *d = new guchar[size];
 590
 591     if (!data->GetDataHere( format, (void*)d ))
 592     {
 593         delete[] d;
 594         return;
 595     }
 596
 597 #if wxUSE_THREADS
 598     /* disable GUI threads */
 599 #endif
 600
 601                 gtk_selection_data_set( selection_data,
 602                                         selection_data->target,
 603                                         8,   // 8-bit
 604                                         d,
 605                                         size );
 606
 607 #if wxUSE_THREADS
 608     /* enable GUI threads */
 609 #endif
 610
 611     delete[] d;
 612 }
 613
 614 //----------------------------------------------------------------------------
 615 // "drag_data_delete"
 616 //----------------------------------------------------------------------------
 617
 618 static void source_drag_data_delete( GtkWidget *WXUNUSED(widget),
 619                                      GdkDragContext *context,
 620                                      wxDropSource *WXUNUSED(drop_source) )
 621 {
 622     if (g_isIdle)
 623         wxapp_install_idle_handler();
 624
 625     // printf( "Drag source: drag_data_delete\n" );
 626 }
 627
 628 //----------------------------------------------------------------------------
 629 // "drag_begin"
 630 //----------------------------------------------------------------------------
 631
 632 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 633                                GdkDragContext     *WXUNUSED(context),
 634                                wxDropSource       *WXUNUSED(drop_source) )
 635 {
 636     if (g_isIdle)
 637         wxapp_install_idle_handler();
 638
 639     // printf( "Drag source: drag_begin.\n" );
 640 }
 641
 642 //----------------------------------------------------------------------------
 643 // "drag_end"
 644 //----------------------------------------------------------------------------
 645
 646 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 647                              GdkDragContext     *WXUNUSED(context),
 648                              wxDropSource       *drop_source )
 649 {
 650     if (g_isIdle) wxapp_install_idle_handler();
 651
 652     // printf( "Drag source: drag_end.\n" );
 653
 654     drop_source->m_waiting = FALSE;
 655 }
 656
 657 //-----------------------------------------------------------------------------
 658 // "configure_event" from m_iconWindow
 659 //-----------------------------------------------------------------------------
 660
 661 static gint
 662 gtk_dnd_window_configure_callback( GtkWidget *WXUNUSED(widget), GdkEventConfigure *WXUNUSED(event), wxDropSource *source )
 663 {
 664     if (g_isIdle)
 665         wxapp_install_idle_handler();
 666
 667     source->GiveFeedback( ConvertFromGTK(source->m_dragContext->action) );
 668
 669     return 0;
 670 }
 671
 672 //---------------------------------------------------------------------------
 673 // wxDropSource
 674 //---------------------------------------------------------------------------
 675
 676 wxDropSource::wxDropSource(wxWindow *win,
 677                            const wxIcon &iconCopy,
 678                            const wxIcon &iconMove,
 679                            const wxIcon &iconNone)
 680 {
 681     m_waiting = TRUE;
 682
 683     m_iconWindow = (GtkWidget*) NULL;
 684
 685     m_window = win;
 686     m_widget = win->m_widget;
 687     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 688
 689     m_retValue = wxDragCancel;
 690
 691     SetIcons(iconCopy, iconMove, iconNone);
 692 }
 693
 694 wxDropSource::wxDropSource(wxDataObject& data,
 695                            wxWindow *win,
 696                            const wxIcon &iconCopy,
 697                            const wxIcon &iconMove,
 698                            const wxIcon &iconNone)
 699 {
 700     m_waiting = TRUE;
 701
 702     SetData( data );
 703
 704     m_iconWindow = (GtkWidget*) NULL;
 705
 706     m_window = win;
 707     m_widget = win->m_widget;
 708     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 709
 710     m_retValue = wxDragCancel;
 711
 712     SetIcons(iconCopy, iconMove, iconNone);
 713 }
 714
 715 void wxDropSource::SetIcons(const wxIcon &iconCopy,
 716                             const wxIcon &iconMove,
 717                             const wxIcon &iconNone)
 718 {
 719     m_iconCopy = iconCopy;
 720     m_iconMove = iconMove;
 721     m_iconNone = iconNone;
 722
 723     if ( !m_iconCopy.Ok() )
 724         m_iconCopy = wxIcon(page_xpm);
 725     if ( !m_iconMove.Ok() )
 726         m_iconMove = m_iconCopy;
 727     if ( !m_iconNone.Ok() )
 728         m_iconNone = m_iconCopy;
 729 }
 730
 731 wxDropSource::~wxDropSource()
 732 {
 733 }
 734
 735 void wxDropSource::PrepareIcon( int action, GdkDragContext *context )
 736 {
 737     // get the right icon to display
 738     wxIcon *icon = NULL;
 739     if ( action & GDK_ACTION_MOVE )
 740         icon = &m_iconMove;
 741     else if ( action & GDK_ACTION_COPY )
 742         icon = &m_iconCopy;
 743     else
 744         icon = &m_iconNone;
 745
 746     GdkBitmap *mask;
 747     if ( icon->GetMask() )
 748         mask = icon->GetMask()->GetBitmap();
 749     else
 750         mask = (GdkBitmap *)NULL;
 751
 752     GdkPixmap *pixmap = icon->GetPixmap();
 753
 754     gint width,height;
 755     gdk_window_get_size (pixmap, &width, &height);
 756
 757     GdkColormap *colormap = gtk_widget_get_colormap( m_widget );
 758 #ifndef __WXGTK20__
 759     gtk_widget_push_visual (gdk_colormap_get_visual (colormap));
 760 #endif
 761     gtk_widget_push_colormap (colormap);
 762
 763     m_iconWindow = gtk_window_new (GTK_WINDOW_POPUP);
 764     gtk_widget_set_events (m_iconWindow, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
 765     gtk_widget_set_app_paintable (GTK_WIDGET (m_iconWindow), TRUE);
 766
 767 #ifndef __WXGTK20__
 768     gtk_widget_pop_visual ();
 769 #endif
 770     gtk_widget_pop_colormap ();
 771
 772     gtk_widget_set_usize (m_iconWindow, width, height);
 773     gtk_widget_realize (m_iconWindow);
 774
 775     gtk_signal_connect( GTK_OBJECT(m_iconWindow), "configure_event",
 776         GTK_SIGNAL_FUNC(gtk_dnd_window_configure_callback), (gpointer)this );
 777
 778     gdk_window_set_back_pixmap (m_iconWindow->window, pixmap, FALSE);
 779
 780     if (mask)
 781         gtk_widget_shape_combine_mask (m_iconWindow, mask, 0, 0);
 782
 783     gtk_drag_set_icon_widget( context, m_iconWindow, 0, 0 );
 784 }
 785
 786 wxDragResult wxDropSource::DoDragDrop(int flags)
 787 {
 788     wxCHECK_MSG( m_data && m_data->GetFormatCount(), wxDragNone,
 789                  wxT("Drop source: no data") );
 790
 791     // still in drag
 792     if (g_blockEventsOnDrag)
 793         return wxDragNone;
 794
 795     // disabled for now
 796     g_blockEventsOnDrag = TRUE;
 797
 798     RegisterWindow();
 799
 800     m_waiting = TRUE;
 801
 802     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 803
 804     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 805     m_data->GetAllFormats( array );
 806     size_t count = m_data->GetFormatCount();
 807     for (size_t i = 0; i < count; i++)
 808     {
 809         GdkAtom atom = array[i];
 810         wxLogTrace(TRACE_DND, wxT("Drop source: Supported atom %s"), gdk_atom_name( atom ));
 811         gtk_target_list_add( target_list, atom, 0, 0 );
 812     }
 813     delete[] array;
 814
 815     GdkEventMotion event;
 816     event.window = m_widget->window;
 817     int x = 0;
 818     int y = 0;
 819     GdkModifierType state;
 820     gdk_window_get_pointer( event.window, &x, &y, &state );
 821     event.x = x;
 822     event.y = y;
 823     event.state = state;
 824     event.time = (guint32)GDK_CURRENT_TIME;
 825
 826     /* GTK wants to know which button was pressed which caused the dragging */
 827     int button_number = 0;
 828     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 829     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 830     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 831
 832 #if wxUSE_THREADS
 833     /* disable GUI threads */
 834 #endif
 835
 836     /* don't start dragging if no button is down */
 837     if (button_number)
 838     {
 839         int action = GDK_ACTION_COPY;
 840         if ( flags & wxDrag_AllowMove )
 841             action |= GDK_ACTION_MOVE;
 842
 843         // VZ: as we already use g_blockEventsOnDrag it shouldn't be that bad
 844         //     to use a global to pass the flags to the drop target but I'd
 845         //     surely prefer a better way to do it
 846         gs_flagsForDrag = flags;
 847
 848         GdkDragContext *context = gtk_drag_begin( m_widget,
 849                 target_list,
 850                 (GdkDragAction)action,
 851                 button_number,  /* number of mouse button which started drag */
 852                 (GdkEvent*) &event );
 853
 854         m_dragContext = context;
 855
 856         PrepareIcon( action, context );
 857
 858         while (m_waiting)
 859             gtk_main_iteration();
 860
 861         m_retValue = ConvertFromGTK(context->action);
 862         if ( m_retValue == wxDragNone )
 863             m_retValue = wxDragCancel;
 864     }
 865
 866 #if wxUSE_THREADS
 867     /* re-enable GUI threads */
 868 #endif
 869
 870     g_blockEventsOnDrag = FALSE;
 871
 872     UnregisterWindow();
 873
 874     return m_retValue;
 875 }
 876
 877 void wxDropSource::RegisterWindow()
 878 {
 879     if (!m_widget) return;
 880
 881     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 882                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 883     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 884                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 885     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 886                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 887     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 888                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 889
 890 }
 891
 892 void wxDropSource::UnregisterWindow()
 893 {
 894     if (!m_widget) return;
 895
 896     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 897                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 898     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 899                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 900     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 901                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 902     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 903                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 904 }
 905
 906 #endif
 907       // wxUSE_DRAG_AND_DROP