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