src/x11/app.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        app.cpp
   3 // Purpose:     wxApp
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     17/09/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13     #pragma implementation "app.h"
  14 #endif
  15
  16 #include "wx/frame.h"
  17 #include "wx/app.h"
  18 #include "wx/utils.h"
  19 #include "wx/gdicmn.h"
  20 #include "wx/pen.h"
  21 #include "wx/brush.h"
  22 #include "wx/cursor.h"
  23 #include "wx/icon.h"
  24 #include "wx/dialog.h"
  25 #include "wx/msgdlg.h"
  26 #include "wx/log.h"
  27 #include "wx/module.h"
  28 #include "wx/memory.h"
  29 #include "wx/log.h"
  30 #include "wx/intl.h"
  31 #include "wx/evtloop.h"
  32
  33 #if wxUSE_THREADS
  34     #include "wx/thread.h"
  35 #endif
  36
  37 #if wxUSE_WX_RESOURCES
  38     #include "wx/resource.h"
  39 #endif
  40
  41 #ifdef __VMS__
  42 #pragma message disable nosimpint
  43 #endif
  44 #include <X11/Xlib.h>
  45 #include <X11/Xutil.h>
  46 #include <X11/Xresource.h>
  47 #include <X11/Xatom.h>
  48 #ifdef __VMS__
  49 #pragma message enable nosimpint
  50 #endif
  51
  52 #include "wx/x11/private.h"
  53
  54 #include <string.h>
  55
  56 extern char *wxBuffer;
  57 extern wxList wxPendingDelete;
  58
  59 wxApp *wxTheApp = NULL;
  60
  61 wxHashTable *wxWidgetHashTable = NULL;
  62
  63 IMPLEMENT_DYNAMIC_CLASS(wxApp, wxEvtHandler)
  64
  65 BEGIN_EVENT_TABLE(wxApp, wxEvtHandler)
  66     EVT_IDLE(wxApp::OnIdle)
  67 END_EVENT_TABLE()
  68
  69 #ifdef __WXDEBUG__
  70 typedef int (*XErrorHandlerFunc)(Display *, XErrorEvent *);
  71
  72 XErrorHandlerFunc gs_pfnXErrorHandler = 0;
  73
  74 static int wxXErrorHandler(Display *dpy, XErrorEvent *xevent)
  75 {
  76     // just forward to the default handler for now
  77     return gs_pfnXErrorHandler(dpy, xevent);
  78 }
  79 #endif // __WXDEBUG__
  80
  81 long wxApp::sm_lastMessageTime = 0;
  82
  83 bool wxApp::Initialize()
  84 {
  85     wxBuffer = new char[BUFSIZ + 512];
  86
  87     wxClassInfo::InitializeClasses();
  88
  89     // GL: I'm annoyed ... I don't know where to put this and I don't want to
  90     // create a module for that as it's part of the core.
  91 #if wxUSE_THREADS
  92     wxPendingEventsLocker = new wxCriticalSection();
  93 #endif
  94
  95     wxTheColourDatabase = new wxColourDatabase(wxKEY_STRING);
  96     wxTheColourDatabase->Initialize();
  97
  98     wxInitializeStockLists();
  99     wxInitializeStockObjects();
 100
 101 #if wxUSE_WX_RESOURCES
 102     wxInitializeResourceSystem();
 103 #endif
 104
 105     wxBitmap::InitStandardHandlers();
 106
 107     wxWidgetHashTable = new wxHashTable(wxKEY_INTEGER);
 108
 109     wxModule::RegisterModules();
 110     if (!wxModule::InitializeModules()) return FALSE;
 111
 112     return TRUE;
 113 }
 114
 115 void wxApp::CleanUp()
 116 {
 117     delete wxWidgetHashTable;
 118     wxWidgetHashTable = NULL;
 119
 120     wxModule::CleanUpModules();
 121
 122 #if wxUSE_WX_RESOURCES
 123     wxCleanUpResourceSystem();
 124 #endif
 125
 126     wxDeleteStockObjects() ;
 127
 128     // Destroy all GDI lists, etc.
 129
 130     wxDeleteStockLists();
 131
 132     delete wxTheColourDatabase;
 133     wxTheColourDatabase = NULL;
 134
 135     wxBitmap::CleanUpHandlers();
 136
 137     delete[] wxBuffer;
 138     wxBuffer = NULL;
 139
 140     wxClassInfo::CleanUpClasses();
 141
 142     delete wxTheApp;
 143     wxTheApp = NULL;
 144
 145     // GL: I'm annoyed ... I don't know where to put this and I don't want to
 146     // create a module for that as it's part of the core.
 147 #if wxUSE_THREADS
 148     delete wxPendingEvents;
 149     delete wxPendingEventsLocker;
 150 #endif
 151
 152 #if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
 153     // At this point we want to check if there are any memory
 154     // blocks that aren't part of the wxDebugContext itself,
 155     // as a special case. Then when dumping we need to ignore
 156     // wxDebugContext, too.
 157     if (wxDebugContext::CountObjectsLeft(TRUE) > 0)
 158     {
 159         wxLogDebug("There were memory leaks.\n");
 160         wxDebugContext::Dump();
 161         wxDebugContext::PrintStatistics();
 162     }
 163 #endif
 164
 165     // do it as the very last thing because everything else can log messages
 166     wxLog::DontCreateOnDemand();
 167     // do it as the very last thing because everything else can log messages
 168     delete wxLog::SetActiveTarget(NULL);
 169 }
 170
 171 int wxEntry( int argc, char *argv[] )
 172 {
 173 #if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
 174     // This seems to be necessary since there are 'rogue'
 175     // objects present at this point (perhaps global objects?)
 176     // Setting a checkpoint will ignore them as far as the
 177     // memory checking facility is concerned.
 178     // Of course you may argue that memory allocated in globals should be
 179     // checked, but this is a reasonable compromise.
 180     wxDebugContext::SetCheckpoint();
 181 #endif
 182
 183     if (!wxApp::Initialize())
 184         return FALSE;
 185
 186     if (!wxTheApp)
 187     {
 188         if (!wxApp::GetInitializerFunction())
 189         {
 190             printf( "wxWindows error: No initializer - use IMPLEMENT_APP macro.\n" );
 191             return 0;
 192         };
 193
 194         wxTheApp = (wxApp*) (* wxApp::GetInitializerFunction()) ();
 195     };
 196
 197     if (!wxTheApp)
 198     {
 199         printf( "wxWindows error: wxTheApp == NULL\n" );
 200         return 0;
 201     };
 202
 203     wxTheApp->SetClassName(wxFileNameFromPath(argv[0]));
 204     wxTheApp->SetAppName(wxFileNameFromPath(argv[0]));
 205
 206     wxTheApp->argc = argc;
 207     wxTheApp->argv = argv;
 208
 209     // GUI-specific initialization, such as creating an app context.
 210     wxTheApp->OnInitGui();
 211
 212     // Here frames insert themselves automatically into wxTopLevelWindows by
 213     // getting created in OnInit().
 214
 215     int retValue = 0;
 216     if (wxTheApp->OnInit())
 217     {
 218         if (wxTheApp->Initialized()) retValue = wxTheApp->OnRun();
 219     }
 220
 221     // flush the logged messages if any
 222     wxLog *pLog = wxLog::GetActiveTarget();
 223     if ( pLog != NULL && pLog->HasPendingMessages() )
 224         pLog->Flush();
 225
 226     delete wxLog::SetActiveTarget(new wxLogStderr); // So dialog boxes aren't used
 227     // for further messages
 228
 229     if (wxTheApp->GetTopWindow())
 230     {
 231         delete wxTheApp->GetTopWindow();
 232         wxTheApp->SetTopWindow(NULL);
 233     }
 234
 235     wxTheApp->DeletePendingObjects();
 236
 237     wxTheApp->OnExit();
 238
 239     wxApp::CleanUp();
 240
 241     return retValue;
 242 };
 243
 244 // Static member initialization
 245 wxAppInitializerFunction wxAppBase::m_appInitFn = (wxAppInitializerFunction) NULL;
 246
 247 wxApp::wxApp()
 248 {
 249     m_topWindow = NULL;
 250     wxTheApp = this;
 251     m_className = "";
 252     m_wantDebugOutput = TRUE ;
 253     m_appName = "";
 254     argc = 0;
 255     argv = NULL;
 256     m_exitOnFrameDelete = TRUE;
 257     m_mainColormap = (WXColormap) NULL;
 258     m_topLevelWidget = (WXWindow) NULL;
 259     m_maxRequestSize = 0;
 260     m_initialDisplay = (WXDisplay*) 0;
 261     m_mainLoop = NULL;
 262 }
 263
 264 bool wxApp::Initialized()
 265 {
 266     if (GetTopWindow())
 267         return TRUE;
 268     else
 269         return FALSE;
 270 }
 271
 272 int wxApp::MainLoop()
 273 {
 274      int rt;
 275     m_mainLoop = new wxEventLoop;
 276
 277     rt = m_mainLoop->Run();
 278
 279     delete m_mainLoop;
 280     m_mainLoop = NULL;
 281     return rt;
 282 }
 283
 284 // Processes an X event.
 285 void wxApp::ProcessXEvent(WXEvent* _event)
 286 {
 287     XEvent* event = (XEvent*) _event;
 288
 289     wxWindow* win = NULL;
 290     Window window = event->xany.window;
 291     Window actualWindow = window;
 292
 293     // Find the first wxWindow that corresponds to this event window
 294     // TODO: may need to translate coordinates from actualWindow
 295     // to window, if the receiving window != wxWindow window
 296     while (window && !(win = wxGetWindowFromTable(window)))
 297         window = wxGetParentWindow(window);
 298
 299     // TODO: shouldn't all the ProcessEvents below
 300     // be win->GetEventHandler()->ProcessEvent?
 301     switch (event->type)
 302     {
 303         case KeyPress:
 304         {
 305             if (win && !win->IsEnabled())
 306                 return;
 307
 308             if (CheckForAccelerator(_event))
 309             {
 310                 // Do nothing! We intercepted and processed the event as an
 311                 // accelerator.
 312                 return;
 313             }
 314             else
 315             {
 316                 if (win)
 317                 {
 318                     wxKeyEvent keyEvent(wxEVT_KEY_DOWN);
 319                     wxTranslateKeyEvent(keyEvent, win, window, event);
 320
 321                     // We didn't process wxEVT_KEY_DOWN, so send
 322                     // wxEVT_CHAR
 323                     if (!win->GetEventHandler()->ProcessEvent( keyEvent ))
 324                     {
 325                         keyEvent.SetEventType(wxEVT_CHAR);
 326                         win->GetEventHandler()->ProcessEvent( keyEvent );
 327                     }
 328
 329                     // We intercepted and processed the key down event
 330                     return;
 331                 }
 332             }
 333             return;
 334         }
 335         case KeyRelease:
 336         {
 337             if (win && !win->IsEnabled())
 338                 return;
 339
 340             if (win)
 341             {
 342                 wxKeyEvent keyEvent(wxEVT_KEY_UP);
 343                 wxTranslateKeyEvent(keyEvent, win, window, event);
 344
 345                 win->GetEventHandler()->ProcessEvent( keyEvent );
 346             }
 347             return;
 348         }
 349         case PropertyNotify:
 350         {
 351             HandlePropertyChange(_event);
 352             return;
 353         }
 354         case ClientMessage:
 355         {
 356             Atom wm_delete_window = XInternAtom(wxGlobalDisplay(), "WM_DELETE_WINDOW", True);;
 357             Atom wm_protocols = XInternAtom(wxGlobalDisplay(), "WM_PROTOCOLS", True);;
 358
 359             if (event->xclient.message_type == wm_protocols)
 360             {
 361                 if (event->xclient.data.l[0] == wm_delete_window)
 362                 {
 363                     if (win)
 364                     {
 365                         win->Close(FALSE);
 366                     }
 367                 }
 368             }
 369             return;
 370         }
 371         case ResizeRequest:
 372         {
 373             /* Terry Gitnick <terryg@scientech.com> - 1/21/98
 374             * If resize event, don't resize until the last resize event for this
 375             * window is recieved. Prevents flicker as windows are resized.
 376             */
 377
 378             Display *disp = (Display*) wxGetDisplay();
 379             XEvent report;
 380
 381             //  to avoid flicker
 382             report = * event;
 383             while( XCheckTypedWindowEvent (disp, actualWindow, ResizeRequest, &report));
 384
 385             // TODO: when implementing refresh optimization, we can use
 386             // XtAddExposureToRegion to expand the window's paint region.
 387
 388             if (win)
 389             {
 390                 wxSize sz = win->GetSize();
 391                 wxSizeEvent sizeEvent(sz, win->GetId());
 392                 sizeEvent.SetEventObject(win);
 393
 394                 win->GetEventHandler()->ProcessEvent( sizeEvent );
 395             }
 396
 397             return;
 398         }
 399         case Expose:
 400         {
 401             if (win)
 402             {
 403                 win->AddUpdateRect(event->xexpose.x, event->xexpose.y,
 404                                event->xexpose.width, event->xexpose.height);
 405
 406                 if (event -> xexpose.count == 0)
 407                 {
 408                     win->DoPaint();
 409                     win->ClearUpdateRects();
 410                 }
 411             }
 412
 413             return;
 414         }
 415         case EnterNotify:
 416         case LeaveNotify:
 417         case ButtonPress:
 418         case ButtonRelease:
 419         case MotionNotify:
 420         {
 421             if (win && !win->IsEnabled())
 422                 return;
 423
 424             if (win)
 425             {
 426                 wxMouseEvent wxevent;
 427                 wxTranslateMouseEvent(wxevent, win, window, event);
 428                 win->GetEventHandler()->ProcessEvent( wxevent );
 429             }
 430             return;
 431         }
 432         case FocusIn:
 433             {
 434                 if (win && event->xfocus.detail != NotifyPointer)
 435                 {
 436                     wxFocusEvent focusEvent(wxEVT_SET_FOCUS, win->GetId());
 437                     focusEvent.SetEventObject(win);
 438                     win->GetEventHandler()->ProcessEvent(focusEvent);
 439                 }
 440                 break;
 441             }
 442         case FocusOut:
 443             {
 444                 if (win && event->xfocus.detail != NotifyPointer)
 445                 {
 446                     wxFocusEvent focusEvent(wxEVT_KILL_FOCUS, win->GetId());
 447                     focusEvent.SetEventObject(win);
 448                     win->GetEventHandler()->ProcessEvent(focusEvent);
 449                 }
 450                 break;
 451             }
 452         case DestroyNotify:
 453             {
 454                 // Do we want to process this (for top-level windows)?
 455                 // But we want to be able to veto closes, anyway
 456                 break;
 457             }
 458         default:
 459         {
 460             break;
 461         }
 462     }
 463 }
 464
 465 // Returns TRUE if more time is needed.
 466 // Note that this duplicates wxEventLoopImpl::SendIdleEvent
 467 // but ProcessIdle may be needed by apps, so is kept.
 468 bool wxApp::ProcessIdle()
 469 {
 470     wxIdleEvent event;
 471     event.SetEventObject(this);
 472     ProcessEvent(event);
 473
 474     return event.MoreRequested();
 475 }
 476
 477 void wxApp::ExitMainLoop()
 478 {
 479     if (m_mainLoop)
 480         m_mainLoop->Exit(0);
 481 }
 482
 483 // Is a message/event pending?
 484 bool wxApp::Pending()
 485 {
 486     return wxEventLoop::GetActive()->Pending();
 487 }
 488
 489 // Dispatch a message.
 490 void wxApp::Dispatch()
 491 {
 492     wxEventLoop::GetActive()->Dispatch();
 493 }
 494
 495 // This should be redefined in a derived class for
 496 // handling property change events for XAtom IPC.
 497 void wxApp::HandlePropertyChange(WXEvent *event)
 498 {
 499     // by default do nothing special
 500     // TODO: what to do for X11
 501     // XtDispatchEvent((XEvent*) event); /* let Motif do the work */
 502 }
 503
 504 void wxApp::OnIdle(wxIdleEvent& event)
 505 {
 506     static bool inOnIdle = FALSE;
 507
 508     // Avoid recursion (via ProcessEvent default case)
 509     if (inOnIdle)
 510         return;
 511
 512     inOnIdle = TRUE;
 513
 514     // If there are pending events, we must process them: pending events
 515     // are either events to the threads other than main or events posted
 516     // with wxPostEvent() functions
 517     // GRG: I have moved this here so that all pending events are processed
 518     //   before starting to delete any objects. This behaves better (in
 519     //   particular, wrt wxPostEvent) and is coherent with wxGTK's current
 520     //   behaviour. Also removed the '#if wxUSE_THREADS' around it.
 521     //  Changed Mar/2000 before 2.1.14
 522
 523     // Flush pending events.
 524     ProcessPendingEvents();
 525
 526     // 'Garbage' collection of windows deleted with Close().
 527     DeletePendingObjects();
 528
 529     // flush the logged messages if any
 530     wxLog *pLog = wxLog::GetActiveTarget();
 531     if ( pLog != NULL && pLog->HasPendingMessages() )
 532         pLog->Flush();
 533
 534     // Send OnIdle events to all windows
 535     bool needMore = SendIdleEvents();
 536
 537     if (needMore)
 538         event.RequestMore(TRUE);
 539
 540     inOnIdle = FALSE;
 541 }
 542
 543 void wxWakeUpIdle()
 544 {
 545     // **** please implement me! ****
 546     // Wake up the idle handler processor, even if it is in another thread...
 547 }
 548
 549
 550 // Send idle event to all top-level windows
 551 bool wxApp::SendIdleEvents()
 552 {
 553     bool needMore = FALSE;
 554
 555     wxWindowList::Node* node = wxTopLevelWindows.GetFirst();
 556     while (node)
 557     {
 558         wxWindow* win = node->GetData();
 559         if (SendIdleEvents(win))
 560             needMore = TRUE;
 561         node = node->GetNext();
 562     }
 563
 564     return needMore;
 565 }
 566
 567 // Send idle event to window and all subwindows
 568 bool wxApp::SendIdleEvents(wxWindow* win)
 569 {
 570     bool needMore = FALSE;
 571
 572     wxIdleEvent event;
 573     event.SetEventObject(win);
 574     win->ProcessEvent(event);
 575
 576     if (event.MoreRequested())
 577         needMore = TRUE;
 578
 579     wxNode* node = win->GetChildren().First();
 580     while (node)
 581     {
 582         wxWindow* win = (wxWindow*) node->Data();
 583         if (SendIdleEvents(win))
 584             needMore = TRUE;
 585
 586         node = node->Next();
 587     }
 588     return needMore ;
 589 }
 590
 591 void wxApp::DeletePendingObjects()
 592 {
 593     wxNode *node = wxPendingDelete.First();
 594     while (node)
 595     {
 596         wxObject *obj = (wxObject *)node->Data();
 597
 598         delete obj;
 599
 600         if (wxPendingDelete.Member(obj))
 601             delete node;
 602
 603         // Deleting one object may have deleted other pending
 604         // objects, so start from beginning of list again.
 605         node = wxPendingDelete.First();
 606     }
 607 }
 608
 609 // Create an application context
 610 bool wxApp::OnInitGui()
 611 {
 612     // TODO: parse argv and get display to pass to XOpenDisplay
 613     Display* dpy = XOpenDisplay(NULL);
 614     m_initialDisplay = (WXDisplay*) dpy;
 615
 616     if (!dpy) {
 617         wxString className(wxTheApp->GetClassName());
 618         wxLogError(_("wxWindows could not open display for '%s': exiting."),
 619             (const char*) className);
 620         exit(-1);
 621     }
 622     XSelectInput((Display*) m_initialDisplay,
 623         XDefaultRootWindow((Display*) m_initialDisplay),
 624         PropertyChangeMask);
 625
 626 #ifdef __WXDEBUG__
 627     // install the X error handler
 628     gs_pfnXErrorHandler = XSetErrorHandler(wxXErrorHandler);
 629 #endif // __WXDEBUG__
 630
 631     GetMainColormap(dpy);
 632     m_maxRequestSize = XMaxRequestSize((Display*) dpy);
 633
 634     return TRUE;
 635 }
 636
 637 WXColormap wxApp::GetMainColormap(WXDisplay* display)
 638 {
 639     if (!display) /* Must be called first with non-NULL display */
 640         return m_mainColormap;
 641
 642     int defaultScreen = DefaultScreen((Display*) display);
 643     Screen* screen = XScreenOfDisplay((Display*) display, defaultScreen);
 644
 645     Colormap c = DefaultColormapOfScreen(screen);
 646
 647     if (!m_mainColormap)
 648         m_mainColormap = (WXColormap) c;
 649
 650     return (WXColormap) c;
 651 }
 652
 653 Window wxGetWindowParent(Window window)
 654 {
 655     Window parent, root = 0;
 656     unsigned int noChildren = 0;
 657     if (XQueryTree((Display*) wxGetDisplay(), window, & root, & parent,
 658         NULL, & noChildren))
 659         return parent;
 660     else
 661         return (Window) 0;
 662 }
 663
 664 // Returns TRUE if an accelerator has been processed
 665 bool wxApp::CheckForAccelerator(WXEvent* event)
 666 {
 667     XEvent* xEvent = (XEvent*) event;
 668     if (xEvent->xany.type == KeyPress)
 669     {
 670         // Find a wxWindow for this window
 671         // TODO: should get display for the window, not the current display
 672         Window window = xEvent->xany.window;
 673         wxWindow* win = NULL;
 674
 675         // Find the first wxWindow that corresponds to this event window
 676         while (window && !(win = wxGetWindowFromTable(window)))
 677             window = wxGetWindowParent(window);
 678
 679         if (!window || !win)
 680             return FALSE;
 681
 682         wxKeyEvent keyEvent(wxEVT_CHAR);
 683         wxTranslateKeyEvent(keyEvent, win, (Window) 0, xEvent);
 684
 685         // Now we have a wxKeyEvent and we have a wxWindow.
 686         // Go up the hierarchy until we find a matching accelerator,
 687         // or we get to the top.
 688         while (win)
 689         {
 690             if (win->ProcessAccelerator(keyEvent))
 691                 return TRUE;
 692             win = win->GetParent();
 693         }
 694         return FALSE;
 695     }
 696     return FALSE;
 697 }
 698
 699 void wxExit()
 700 {
 701     int retValue = 0;
 702     if (wxTheApp)
 703         retValue = wxTheApp->OnExit();
 704
 705     wxApp::CleanUp();
 706     /*
 707     * Exit in some platform-specific way. Not recommended that the app calls this:
 708     * only for emergencies.
 709     */
 710     exit(retValue);
 711 }
 712
 713 // Yield to other processes
 714
 715 bool wxApp::Yield(bool onlyIfNeeded)
 716 {
 717     bool s_inYield = FALSE;
 718
 719     if ( s_inYield )
 720     {
 721         if ( !onlyIfNeeded )
 722         {
 723             wxFAIL_MSG( wxT("wxYield called recursively" ) );
 724         }
 725
 726         return FALSE;
 727     }
 728
 729     s_inYield = TRUE;
 730
 731     while (wxTheApp && wxTheApp->Pending())
 732         wxTheApp->Dispatch();
 733
 734     s_inYield = FALSE;
 735
 736     return TRUE;
 737 }
 738
 739 // TODO use XmGetPixmap (?) to get the really standard icons!
 740
 741 // XPM hack: make the arrays const
 742 #define static static const
 743
 744 #include "wx/generic/info.xpm"
 745 #include "wx/generic/error.xpm"
 746 #include "wx/generic/question.xpm"
 747 #include "wx/generic/warning.xpm"
 748
 749 #undef static
 750
 751 wxIcon
 752 wxApp::GetStdIcon(int which) const
 753 {
 754     switch(which)
 755     {
 756         case wxICON_INFORMATION:
 757             return wxIcon(info_xpm);
 758
 759         case wxICON_QUESTION:
 760             return wxIcon(question_xpm);
 761
 762         case wxICON_EXCLAMATION:
 763             return wxIcon(warning_xpm);
 764
 765         default:
 766             wxFAIL_MSG("requested non existent standard icon");
 767             // still fall through
 768
 769         case wxICON_HAND:
 770             return wxIcon(error_xpm);
 771     }
 772 }
 773
 774 // ----------------------------------------------------------------------------
 775 // accessors for C modules
 776 // ----------------------------------------------------------------------------
 777
 778 #if 0
 779 extern "C" XtAppContext wxGetAppContext()
 780 {
 781     return (XtAppContext)wxTheApp->GetAppContext();
 782 }
 783 #endif