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 "gdk/gdk.h"
  25 #include "gtk/gtk.h"
  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 extern void wxapp_install_thread_wakeup();
  44 extern void wxapp_uninstall_thread_wakeup();
  45 #endif
  46
  47 //----------------------------------------------------------------------------
  48 // global data
  49 //----------------------------------------------------------------------------
  50
  51 extern bool g_blockEventsOnDrag;
  52
  53 //----------------------------------------------------------------------------
  54 // standard icons
  55 //----------------------------------------------------------------------------
  56
  57 /* XPM */
  58 static char * gv_xpm[] = {
  59 "40 34 3 1",
  60 "         s None c None",
  61 ".        c black",
  62 "X        c white",
  63 "                                        ",
  64 "                                        ",
  65 "                  ......                ",
  66 "                ..XXXXXX..              ",
  67 "               .XXXXXXXXXX.             ",
  68 "              .XXXXXXXXXXXX.            ",
  69 "              .XXXXXXXXXXXX.            ",
  70 "             .XXXXXXXXXXXXXX.           ",
  71 "             .XXX..XXXX..XXX.           ",
  72 "          ....XX....XX....XX.           ",
  73 "         .XXX.XXX..XXXX..XXX....        ",
  74 "        .XXXXXXXXXXXXXXXXXXX.XXX.       ",
  75 "        .XXXXXXXXXXXXXXXXXXXXXXXX.      ",
  76 "        .XXXXXXXXXXXXXXXXXXXXXXXX.      ",
  77 "         ..XXXXXXXXXXXXXXXXXXXXXX.      ",
  78 "           .XXXXXXXXXXXXXXXXXX...       ",
  79 "           ..XXXXXXXXXXXXXXXX.          ",
  80 "            .XXXXXXXXXXXXXXXX.          ",
  81 "            .XXXXXXXXXXXXXXXX.          ",
  82 "            .XXXXXXXXXXXXXXXXX.         ",
  83 "            .XXXXXXXXXXXXXXXXX.         ",
  84 "            .XXXXXXXXXXXXXXXXXX.        ",
  85 "            .XXXXXXXXXXXXXXXXXXX.       ",
  86 "           .XXXXXXXXXXXXXXXXXXXXX.      ",
  87 "           .XXXXXXXXXXXXXX.XXXXXXX.     ",
  88 "          .XXXXXXX.XXXXXXX.XXXXXXX.     ",
  89 "         .XXXXXXXX.XXXXXXX.XXXXXXX.     ",
  90 "         .XXXXXXX...XXXXX...XXXXX.      ",
  91 "         .XXXXXXX.  .....   .....       ",
  92 "         ..XXXX..                       ",
  93 "           ....                         ",
  94 "                                        ",
  95 "                                        ",
  96 "                                        "};
  97
  98 /* XPM */
  99 static char * page_xpm[] = {
 100 /* width height ncolors chars_per_pixel */
 101 "32 32 5 1",
 102 /* colors */
 103 "         s None        c None",
 104 ".        c black",
 105 "X        c wheat",
 106 "o        c tan",
 107 "O        c #6699FF",
 108 /* pixels */
 109 "    ...................         ",
 110 "    .XXXXXXXXXXXXXXXXX..        ",
 111 "    .XXXXXXXXXXXXXXXXX.o.       ",
 112 "    .XXXXXXXXXXXXXXXXX.oo.      ",
 113 "    .XXXXXXXXXXXXXXXXX.ooo.     ",
 114 "    .XXXXXXXXXXXXXXXXX.oooo.    ",
 115 "    .XXXXXXXXXXXXXXXXX.......   ",
 116 "    .XXXXXOOOOOOOOOOXXXooooo.   ",
 117 "    .XXXXXXXXXXXXXXXXXXooooo.   ",
 118 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 119 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 120 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
 121 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 122 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 123 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 124 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 125 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 126 "    .XXXXXXXOOOOOOOOOXXXXXXX.   ",
 127 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 128 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 129 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 130 "    .XXXXXOOOOOOOOOOXXXXXXXX.   ",
 131 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 132 "    .XXXXXXOOOOOOOOOOXXXXXXX.   ",
 133 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 134 "    .XXXXXOOOOOOOXXXXXXXXXXX.   ",
 135 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 136 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 137 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 138 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 139 "    .XXXXXXXXXXXXXXXXXXXXXXX.   ",
 140 "    .........................   "};
 141
 142
 143
 144 // ----------------------------------------------------------------------------
 145 // "drag_leave"
 146 // ----------------------------------------------------------------------------
 147
 148 static void target_drag_leave( GtkWidget *WXUNUSED(widget),
 149                                GdkDragContext *context,
 150                                guint WXUNUSED(time),
 151                                wxDropTarget *drop_target )
 152 {
 153     if (g_isIdle) wxapp_install_idle_handler();
 154
 155     /* inform the wxDropTarget about the current GdkDragContext.
 156        this is only valid for the duration of this call */
 157     drop_target->SetDragContext( context );
 158
 159     /* we don't need return values. this event is just for
 160        information */
 161     drop_target->OnLeave();
 162
 163     /* this has to be done because GDK has no "drag_enter" event */
 164     drop_target->m_firstMotion = TRUE;
 165
 166     /* after this, invalidate the drop_target's GdkDragContext */
 167     drop_target->SetDragContext( (GdkDragContext*) NULL );
 168 }
 169
 170 // ----------------------------------------------------------------------------
 171 // "drag_motion"
 172 // ----------------------------------------------------------------------------
 173
 174 static gboolean target_drag_motion( GtkWidget *WXUNUSED(widget),
 175                                     GdkDragContext *context,
 176                                     gint x,
 177                                     gint y,
 178                                     guint time,
 179                                     wxDropTarget *drop_target )
 180 {
 181     if (g_isIdle) wxapp_install_idle_handler();
 182
 183     /* Owen Taylor: "if the coordinates not in a drop zone,
 184        return FALSE, otherwise call gtk_drag_status() and
 185        return TRUE" */
 186
 187     /* inform the wxDropTarget about the current GdkDragContext.
 188        this is only valid for the duration of this call */
 189     drop_target->SetDragContext( context );
 190
 191     /* TODO: what should be the default behaviour? Copy or move? */
 192     wxDragResult result = wxDragMove;
 193
 194     if (drop_target->m_firstMotion)
 195     {
 196         /* the first "drag_motion" event substitutes a "drag_enter" event */
 197         result = drop_target->OnEnter( x, y, result );
 198     }
 199     else
 200     {
 201         /* give program a chance to react (i.e. to say no by returning FALSE) */
 202         result = drop_target->OnDragOver( x, y, result );
 203     }
 204
 205     /* we don't yet handle which "actions" (i.e. copy or move)
 206        the target accepts. so far we simply accept the
 207        suggested action. TODO. */
 208     bool ret = result != wxDragNone;
 209     if (ret)
 210         gdk_drag_status( context, context->suggested_action, time );
 211
 212     /* after this, invalidate the drop_target's GdkDragContext */
 213     drop_target->SetDragContext( (GdkDragContext*) NULL );
 214
 215     /* this has to be done because GDK has no "drag_enter" event */
 216     drop_target->m_firstMotion = FALSE;
 217
 218     return ret;
 219 }
 220
 221 // ----------------------------------------------------------------------------
 222 // "drag_drop"
 223 // ----------------------------------------------------------------------------
 224
 225 static gboolean target_drag_drop( GtkWidget *widget,
 226                                   GdkDragContext *context,
 227                                   gint x,
 228                                   gint y,
 229                                   guint time,
 230                                   wxDropTarget *drop_target )
 231 {
 232     if (g_isIdle) wxapp_install_idle_handler();
 233
 234     /* Owen Taylor: "if the drop is not in a drop zone,
 235        return FALSE, otherwise, if you aren't accepting
 236        the drop, call gtk_drag_finish() with success == FALSE
 237        otherwise call gtk_drag_data_get()" */
 238
 239 //    printf( "drop.\n" );
 240
 241     /* this seems to make a difference between not accepting
 242        due to wrong target area and due to wrong format. let
 243        us hope that this is not required.. */
 244
 245     /* inform the wxDropTarget about the current GdkDragContext.
 246        this is only valid for the duration of this call */
 247     drop_target->SetDragContext( context );
 248
 249     /* inform the wxDropTarget about the current drag widget.
 250        this is only valid for the duration of this call */
 251     drop_target->SetDragWidget( widget );
 252
 253     /* inform the wxDropTarget about the current drag time.
 254        this is only valid for the duration of this call */
 255     drop_target->SetDragTime( time );
 256
 257     bool ret = drop_target->OnDrop( x, y );
 258
 259     if (!ret)
 260     {
 261         wxLogDebug( wxT( "Drop target: OnDrop returned TRUE") );
 262
 263         /* cancel the whole thing */
 264         gtk_drag_finish( context,
 265                           FALSE,        /* no success */
 266                           FALSE,        /* don't delete data on dropping side */
 267                           time );
 268     }
 269     else
 270     {
 271         wxLogDebug( wxT( "Drop target: OnDrop returned TRUE") );
 272
 273 #if wxUSE_THREADS
 274         /* disable GUI threads */
 275         wxapp_uninstall_thread_wakeup();
 276 #endif
 277
 278         GdkAtom format = drop_target->GetMatchingPair();
 279         wxASSERT( format );
 280
 281         /* this should trigger an "drag_data_received" event */
 282         gtk_drag_get_data( widget,
 283                            context,
 284                            format,
 285                            time );
 286
 287 #if wxUSE_THREADS
 288         /* re-enable GUI threads */
 289         wxapp_install_thread_wakeup();
 290 #endif
 291     }
 292
 293     /* after this, invalidate the drop_target's GdkDragContext */
 294     drop_target->SetDragContext( (GdkDragContext*) NULL );
 295
 296     /* after this, invalidate the drop_target's drag widget */
 297     drop_target->SetDragWidget( (GtkWidget*) NULL );
 298
 299     /* this has to be done because GDK has no "drag_enter" event */
 300     drop_target->m_firstMotion = TRUE;
 301
 302     return ret;
 303 }
 304
 305 // ----------------------------------------------------------------------------
 306 // "drag_data_received"
 307 // ----------------------------------------------------------------------------
 308
 309 static void target_drag_data_received( GtkWidget *WXUNUSED(widget),
 310                                        GdkDragContext *context,
 311                                        gint x,
 312                                        gint y,
 313                                        GtkSelectionData *data,
 314                                        guint WXUNUSED(info),
 315                                        guint time,
 316                                        wxDropTarget *drop_target )
 317 {
 318     if (g_isIdle) wxapp_install_idle_handler();
 319
 320     /* Owen Taylor: "call gtk_drag_finish() with
 321        success == TRUE" */
 322
 323
 324     if ((data->length <= 0) || (data->format != 8))
 325     {
 326         /* negative data length and non 8-bit data format
 327            qualifies for junk */
 328         gtk_drag_finish (context, FALSE, FALSE, time);
 329
 330         return;
 331     }
 332
 333     wxLogDebug( wxT( "Drop target: data received event") );
 334
 335     /* inform the wxDropTarget about the current GtkSelectionData.
 336        this is only valid for the duration of this call */
 337     drop_target->SetDragData( data );
 338
 339     if (drop_target->OnData( x, y ))
 340     {
 341         wxLogDebug( wxT( "Drop target: OnData returned TRUE") );
 342
 343         /* tell GTK that data transfer was successfull */
 344         gtk_drag_finish( context, TRUE, FALSE, time );
 345     }
 346     else
 347     {
 348         wxLogDebug( wxT( "Drop target: OnData returned FALSE") );
 349
 350         /* tell GTK that data transfer was not successfull */
 351         gtk_drag_finish( context, FALSE, FALSE, time );
 352     }
 353
 354     /* after this, invalidate the drop_target's drag data */
 355     drop_target->SetDragData( (GtkSelectionData*) NULL );
 356 }
 357
 358 //----------------------------------------------------------------------------
 359 // wxDropTarget
 360 //----------------------------------------------------------------------------
 361
 362 wxDropTarget::wxDropTarget( wxDataObject *data )
 363   : wxDropTargetBase( data )
 364 {
 365     m_firstMotion = TRUE;
 366     m_dragContext = (GdkDragContext*) NULL;
 367     m_dragWidget = (GtkWidget*) NULL;
 368     m_dragData = (GtkSelectionData*) NULL;
 369     m_dragTime = 0;
 370 }
 371
 372 wxDragResult wxDropTarget::OnDragOver( wxCoord WXUNUSED(x),
 373                                        wxCoord WXUNUSED(y),
 374                                        wxDragResult def )
 375 {
 376     if (!m_dataObject)
 377         return FALSE;
 378
 379     return (GetMatchingPair() != (GdkAtom) 0) ? def : wxDragNone;
 380 }
 381
 382 bool wxDropTarget::OnDrop( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 383 {
 384     if (!m_dataObject)
 385         return FALSE;
 386
 387     return (GetMatchingPair() != (GdkAtom) 0);
 388 }
 389
 390 bool wxDropTarget::OnData( wxCoord WXUNUSED(x), wxCoord WXUNUSED(y) )
 391 {
 392     if (!m_dataObject)
 393         return FALSE;
 394
 395     if (GetMatchingPair() == (GdkAtom) 0)
 396         return FALSE;
 397
 398     return GetData();
 399 }
 400
 401 GdkAtom wxDropTarget::GetMatchingPair()
 402 {
 403     if (!m_dataObject)
 404         return (GdkAtom) 0;
 405
 406     if (!m_dragContext)
 407         return (GdkAtom) 0;
 408
 409     GList *child = m_dragContext->targets;
 410     while (child)
 411     {
 412         GdkAtom formatAtom = (GdkAtom) GPOINTER_TO_INT(child->data);
 413         wxDataFormat format( formatAtom );
 414
 415 #ifdef __WXDEBUG__
 416         char *name = gdk_atom_name( formatAtom );
 417         if (name) wxLogDebug( "Drop target: drag has format: %s", name );
 418 #endif
 419         if (m_dataObject->IsSupportedFormat( format ))
 420             return formatAtom;
 421
 422         child = child->next;
 423     }
 424
 425     return (GdkAtom) 0;
 426 }
 427
 428 bool wxDropTarget::GetData()
 429 {
 430     if (!m_dragData)
 431         return FALSE;
 432
 433     if (!m_dataObject)
 434         return FALSE;
 435
 436     wxDataFormat dragFormat( m_dragData->target );
 437
 438     if (!m_dataObject->IsSupportedFormat( dragFormat ))
 439         return FALSE;
 440
 441     if (dragFormat.GetType() == wxDF_TEXT)
 442     {
 443         wxTextDataObject *text_object = (wxTextDataObject*)m_dataObject;
 444         text_object->SetText( (const char*)m_dragData->data );
 445         return TRUE;
 446     }
 447
 448     if (dragFormat.GetType() == wxDF_FILENAME)
 449     {
 450         wxFileDataObject *file_object = (wxFileDataObject*)m_dataObject;
 451         file_object->SetData( 0, (const char*)m_dragData->data );
 452         return TRUE;
 453     }
 454
 455     m_dataObject->SetData( dragFormat, (size_t)m_dragData->length, (const void*)m_dragData->data );
 456
 457     return TRUE;
 458 }
 459
 460 void wxDropTarget::UnregisterWidget( GtkWidget *widget )
 461 {
 462     wxCHECK_RET( widget != NULL, wxT("unregister widget is NULL") );
 463
 464     gtk_drag_dest_unset( widget );
 465
 466     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 467                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 468
 469     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 470                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 471
 472     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 473                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 474
 475     gtk_signal_disconnect_by_func( GTK_OBJECT(widget),
 476                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 477 }
 478
 479 void wxDropTarget::RegisterWidget( GtkWidget *widget )
 480 {
 481     wxCHECK_RET( widget != NULL, wxT("register widget is NULL") );
 482
 483     /* gtk_drag_dest_set() determines what default behaviour we'd like
 484        GTK to supply. we don't want to specify out targets (=formats)
 485        or actions in advance (i.e. not GTK_DEST_DEFAULT_MOTION and
 486        not GTK_DEST_DEFAULT_DROP). instead we react individually to
 487        "drag_motion" and "drag_drop" events. this makes it possible
 488        to allow dropping on only a small area. we should set
 489        GTK_DEST_DEFAULT_HIGHLIGHT as this will switch on the nice
 490        highlighting if dragging over standard controls, but this
 491        seems to be broken without the other two. */
 492
 493     gtk_drag_dest_set( widget,
 494                        (GtkDestDefaults) 0,         /* no default behaviour */
 495                        (GtkTargetEntry*) NULL,      /* we don't supply any formats here */
 496                        0,                           /* number of targets = 0 */
 497                        (GdkDragAction) 0 );         /* we don't supply any actions here */
 498
 499     gtk_signal_connect( GTK_OBJECT(widget), "drag_leave",
 500                       GTK_SIGNAL_FUNC(target_drag_leave), (gpointer) this );
 501
 502     gtk_signal_connect( GTK_OBJECT(widget), "drag_motion",
 503                       GTK_SIGNAL_FUNC(target_drag_motion), (gpointer) this );
 504
 505     gtk_signal_connect( GTK_OBJECT(widget), "drag_drop",
 506                       GTK_SIGNAL_FUNC(target_drag_drop), (gpointer) this );
 507
 508     gtk_signal_connect( GTK_OBJECT(widget), "drag_data_received",
 509                       GTK_SIGNAL_FUNC(target_drag_data_received), (gpointer) this );
 510 }
 511
 512 // ----------------------------------------------------------------------------
 513 // wxTextDropTarget
 514 // ----------------------------------------------------------------------------
 515
 516 wxTextDropTarget::wxTextDropTarget()
 517                 : wxDropTarget(new wxTextDataObject)
 518 {
 519 }
 520
 521 bool wxTextDropTarget::OnData(wxCoord x, wxCoord y)
 522 {
 523     if ( !GetData() )
 524         return FALSE;
 525
 526     return OnDropText(x, y, ((wxTextDataObject *)m_dataObject)->GetText());
 527 }
 528
 529 // ----------------------------------------------------------------------------
 530 // wxFileDropTarget
 531 // ----------------------------------------------------------------------------
 532
 533 wxFileDropTarget::wxFileDropTarget()
 534                 : wxDropTarget(new wxFileDataObject)
 535 {
 536 }
 537
 538 bool wxFileDropTarget::OnData(wxCoord x, wxCoord y)
 539 {
 540     if ( !GetData() )
 541         return FALSE;
 542
 543     return OnDropFiles(x, y,
 544                        ((wxFileDataObject *)m_dataObject)->GetFilenames());
 545 }
 546
 547 //----------------------------------------------------------------------------
 548 // "drag_data_get"
 549 //----------------------------------------------------------------------------
 550
 551 static void
 552 source_drag_data_get  (GtkWidget          *WXUNUSED(widget),
 553                        GdkDragContext     *context,
 554                        GtkSelectionData   *selection_data,
 555                        guint               WXUNUSED(info),
 556                        guint               WXUNUSED(time),
 557                        wxDropSource       *drop_source )
 558 {
 559     if (g_isIdle) wxapp_install_idle_handler();
 560
 561     wxDataFormat format( selection_data->target );
 562
 563     wxLogDebug( wxT("Drop source: format requested: %s"), format.GetId().c_str() );
 564
 565     drop_source->m_retValue = wxDragCancel;
 566
 567     wxDataObject *data = drop_source->GetDataObject();
 568
 569     if (!data)
 570     {
 571         wxLogDebug( wxT("Drop source: no data object") );
 572         return;
 573     }
 574
 575     if (!data->IsSupportedFormat(format))
 576     {
 577         wxLogDebug( wxT("Drop source: unsupported format") );
 578         return;
 579     }
 580
 581     if (data->GetDataSize(format) == 0)
 582     {
 583         wxLogDebug( wxT("Drop source: empty data") );
 584         return;
 585     }
 586
 587     size_t size = data->GetDataSize(format);
 588
 589 //  printf( "data size: %d.\n", (int)data_size );
 590
 591     guchar *d = new guchar[size];
 592
 593     if (!data->GetDataHere( format, (void*)d ))
 594     {
 595         delete[] d;
 596         return;
 597     }
 598
 599 #if wxUSE_THREADS
 600     /* disable GUI threads */
 601     wxapp_uninstall_thread_wakeup();
 602 #endif
 603
 604                 gtk_selection_data_set( selection_data,
 605                                         selection_data->target,
 606                                         8,   // 8-bit
 607                                         d,
 608                                         size );
 609
 610 #if wxUSE_THREADS
 611     /* enable GUI threads */
 612     wxapp_install_thread_wakeup();
 613 #endif
 614
 615     delete[] d;
 616
 617     /* so far only copy, no moves. TODO. */
 618     drop_source->m_retValue = wxDragCopy;
 619 }
 620
 621 //----------------------------------------------------------------------------
 622 // "drag_data_delete"
 623 //----------------------------------------------------------------------------
 624
 625 static void source_drag_data_delete( GtkWidget          *WXUNUSED(widget),
 626                                      GdkDragContext     *WXUNUSED(context),
 627                                      wxDropSource       *drop_source )
 628 {
 629     if (g_isIdle) wxapp_install_idle_handler();
 630
 631 //  printf( "Delete the data!\n" );
 632
 633     drop_source->m_retValue = wxDragMove;
 634 }
 635
 636 //----------------------------------------------------------------------------
 637 // "drag_begin"
 638 //----------------------------------------------------------------------------
 639
 640 static void source_drag_begin( GtkWidget          *WXUNUSED(widget),
 641                                GdkDragContext     *WXUNUSED(context),
 642                                wxDropSource       *WXUNUSED(drop_source) )
 643 {
 644     if (g_isIdle) wxapp_install_idle_handler();
 645
 646 //  printf( "drag_begin.\n" );
 647 }
 648
 649 //----------------------------------------------------------------------------
 650 // "drag_end"
 651 //----------------------------------------------------------------------------
 652
 653 static void source_drag_end( GtkWidget          *WXUNUSED(widget),
 654                              GdkDragContext     *WXUNUSED(context),
 655                              wxDropSource       *drop_source )
 656 {
 657     if (g_isIdle) wxapp_install_idle_handler();
 658
 659 //  printf( "drag_end.\n" );
 660
 661     drop_source->m_waiting = FALSE;
 662 }
 663
 664 //---------------------------------------------------------------------------
 665 // wxDropSource
 666 //---------------------------------------------------------------------------
 667
 668 wxDropSource::wxDropSource( wxWindow *win, const wxIcon &go, const wxIcon &stop )
 669 {
 670     g_blockEventsOnDrag = TRUE;
 671     m_waiting = TRUE;
 672
 673     m_window = win;
 674     m_widget = win->m_widget;
 675     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 676
 677     m_retValue = wxDragCancel;
 678
 679     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 680     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 681
 682     m_goIcon = go;
 683     if (wxNullIcon == go) m_goIcon = wxIcon( page_xpm );
 684     m_stopIcon = stop;
 685     if (wxNullIcon == stop) m_stopIcon = wxIcon( gv_xpm );
 686 }
 687
 688 wxDropSource::wxDropSource( wxDataObject& data, wxWindow *win,
 689                             const wxIcon &go, const wxIcon &stop )
 690 {
 691     m_waiting = TRUE;
 692
 693     SetData( data );
 694
 695     m_window = win;
 696     m_widget = win->m_widget;
 697     if (win->m_wxwindow) m_widget = win->m_wxwindow;
 698     m_retValue = wxDragCancel;
 699
 700     m_defaultCursor = wxCursor( wxCURSOR_NO_ENTRY );
 701     m_goaheadCursor = wxCursor( wxCURSOR_HAND );
 702
 703     m_goIcon = go;
 704     if (wxNullIcon == go) m_goIcon = wxIcon( page_xpm );
 705     m_stopIcon = stop;
 706     if (wxNullIcon == stop) m_stopIcon = wxIcon( gv_xpm );
 707 }
 708
 709 wxDropSource::~wxDropSource()
 710 {
 711     g_blockEventsOnDrag = FALSE;
 712 }
 713
 714 wxDragResult wxDropSource::DoDragDrop( bool WXUNUSED(bAllowMove) )
 715 {
 716     wxASSERT_MSG( m_data, wxT("wxDragSource: no data") );
 717
 718     if (!m_data)
 719         return (wxDragResult) wxDragNone;
 720
 721     if (m_data->GetFormatCount() == 0)
 722         return (wxDragResult) wxDragNone;
 723
 724     g_blockEventsOnDrag = TRUE;
 725
 726     RegisterWindow();
 727
 728     m_waiting = TRUE;
 729
 730     GtkTargetList *target_list = gtk_target_list_new( (GtkTargetEntry*) NULL, 0 );
 731
 732     wxDataFormat *array = new wxDataFormat[ m_data->GetFormatCount() ];
 733     m_data->GetAllFormats( array );
 734     for (size_t i = 0; i < m_data->GetFormatCount(); i++)
 735     {
 736         GdkAtom atom = array[i];
 737         wxLogDebug( wxT("Supported atom %s"), gdk_atom_name( atom ) );
 738         gtk_target_list_add( target_list, atom, 0, 0 );
 739     }
 740     delete[] array;
 741
 742     GdkEventMotion event;
 743     event.window = m_widget->window;
 744     int x = 0;
 745     int y = 0;
 746     GdkModifierType state;
 747     gdk_window_get_pointer( event.window, &x, &y, &state );
 748     event.x = x;
 749     event.y = y;
 750     event.state = state;
 751     event.time = GDK_CURRENT_TIME;
 752
 753     /* GTK wants to know which button was pressed which caused the dragging */
 754     int button_number = 0;
 755     if (event.state & GDK_BUTTON1_MASK) button_number = 1;
 756     else if (event.state & GDK_BUTTON2_MASK) button_number = 2;
 757     else if (event.state & GDK_BUTTON3_MASK) button_number = 3;
 758
 759 #if wxUSE_THREADS
 760     /* disable GUI threads */
 761     wxapp_uninstall_thread_wakeup();
 762 #endif
 763
 764     /* don't start dragging if no button is down */
 765     if (button_number)
 766     {
 767         GdkDragContext *context = gtk_drag_begin( m_widget,
 768                                               target_list,
 769                                               GDK_ACTION_COPY,
 770                                               button_number,  /* number of mouse button which started drag */
 771                                               (GdkEvent*) &event );
 772
 773         wxMask *mask = m_goIcon.GetMask();
 774         GdkBitmap *bm = (GdkBitmap *) NULL;
 775         if (mask) bm = mask->GetBitmap();
 776         GdkPixmap *pm = m_goIcon.GetPixmap();
 777
 778         gtk_drag_set_icon_pixmap( context,
 779                                   gtk_widget_get_colormap( m_widget ),
 780                                   pm,
 781                                   bm,
 782                                   0,
 783                                   0 );
 784
 785         while (m_waiting) gtk_main_iteration();;
 786     }
 787
 788 #if wxUSE_THREADS
 789     /* re-enable GUI threads */
 790     wxapp_install_thread_wakeup();
 791 #endif
 792
 793     g_blockEventsOnDrag = FALSE;
 794
 795     UnregisterWindow();
 796
 797     return m_retValue;
 798 }
 799
 800 void wxDropSource::RegisterWindow()
 801 {
 802     if (!m_widget) return;
 803
 804     gtk_signal_connect( GTK_OBJECT(m_widget), "drag_data_get",
 805                       GTK_SIGNAL_FUNC (source_drag_data_get), (gpointer) this);
 806     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_data_delete",
 807                       GTK_SIGNAL_FUNC (source_drag_data_delete),  (gpointer) this );
 808     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_begin",
 809                       GTK_SIGNAL_FUNC (source_drag_begin),  (gpointer) this );
 810     gtk_signal_connect (GTK_OBJECT(m_widget), "drag_end",
 811                       GTK_SIGNAL_FUNC (source_drag_end),  (gpointer) this );
 812
 813 }
 814
 815 void wxDropSource::UnregisterWindow()
 816 {
 817     if (!m_widget) return;
 818
 819     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 820                       GTK_SIGNAL_FUNC(source_drag_data_get), (gpointer) this );
 821     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 822                       GTK_SIGNAL_FUNC(source_drag_data_delete), (gpointer) this );
 823     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 824                       GTK_SIGNAL_FUNC(source_drag_begin), (gpointer) this );
 825     gtk_signal_disconnect_by_func( GTK_OBJECT(m_widget),
 826                       GTK_SIGNAL_FUNC(source_drag_end), (gpointer) this );
 827 }
 828
 829 #endif
 830
 831       // wxUSE_DRAG_AND_DROP