src/motif/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 #ifdef __VMS
  17 #define XtParent XTPARENT
  18 #define XtDisplay XTDISPLAY
  19 #endif
  20
  21 #include "wx/frame.h"
  22 #include "wx/app.h"
  23 #include "wx/utils.h"
  24 #include "wx/gdicmn.h"
  25 #include "wx/pen.h"
  26 #include "wx/brush.h"
  27 #include "wx/cursor.h"
  28 #include "wx/icon.h"
  29 #include "wx/palette.h"
  30 #include "wx/dc.h"
  31 #include "wx/dialog.h"
  32 #include "wx/msgdlg.h"
  33 #include "wx/log.h"
  34 #include "wx/module.h"
  35 #include "wx/memory.h"
  36 #include "wx/log.h"
  37 #include "wx/intl.h"
  38
  39 #if wxUSE_THREADS
  40     #include "wx/thread.h"
  41 #endif
  42
  43 #if wxUSE_WX_RESOURCES
  44     #include "wx/resource.h"
  45 #endif
  46
  47 #ifdef __VMS__
  48 #pragma message disable nosimpint
  49 #endif
  50 #include <Xm/Xm.h>
  51 #include <X11/Xlib.h>
  52 #include <X11/Xutil.h>
  53 #include <X11/Xresource.h>
  54 #include <X11/Xatom.h>
  55 #ifdef __VMS__
  56 #pragma message enable nosimpint
  57 #endif
  58
  59 #include "wx/motif/private.h"
  60
  61 #include <string.h>
  62
  63 extern wxList wxPendingDelete;
  64
  65 wxApp *wxTheApp = NULL;
  66
  67 wxHashTable *wxWidgetHashTable = NULL;
  68
  69 IMPLEMENT_DYNAMIC_CLASS(wxApp, wxEvtHandler)
  70
  71 BEGIN_EVENT_TABLE(wxApp, wxEvtHandler)
  72     EVT_IDLE(wxApp::OnIdle)
  73 END_EVENT_TABLE()
  74
  75 #ifdef __WXDEBUG__
  76     typedef int (*XErrorHandlerFunc)(Display *, XErrorEvent *);
  77
  78     XErrorHandlerFunc gs_pfnXErrorHandler = 0;
  79
  80     static int wxXErrorHandler(Display *dpy, XErrorEvent *xevent)
  81     {
  82         // just forward to the default handler for now
  83         return gs_pfnXErrorHandler(dpy, xevent);
  84     }
  85 #endif // __WXDEBUG__
  86
  87 long wxApp::sm_lastMessageTime = 0;
  88
  89 bool wxApp::Initialize()
  90 {
  91     wxClassInfo::InitializeClasses();
  92
  93     // GL: I'm annoyed ... I don't know where to put this and I don't want to
  94     // create a module for that as it's part of the core.
  95 #if wxUSE_THREADS
  96     wxPendingEventsLocker = new wxCriticalSection();
  97 #endif
  98
  99     wxTheColourDatabase = new wxColourDatabase(wxKEY_STRING);
 100     wxTheColourDatabase->Initialize();
 101
 102     wxInitializeStockLists();
 103     wxInitializeStockObjects();
 104
 105 #if wxUSE_WX_RESOURCES
 106     wxInitializeResourceSystem();
 107 #endif
 108
 109     // For PostScript printing
 110 #if wxUSE_POSTSCRIPT
 111     /* Done using wxModule now
 112     wxInitializePrintSetupData();
 113     wxThePrintPaperDatabase = new wxPrintPaperDatabase;
 114     wxThePrintPaperDatabase->CreateDatabase();
 115     */
 116 #endif
 117
 118     wxBitmap::InitStandardHandlers();
 119
 120     wxWidgetHashTable = new wxHashTable(wxKEY_INTEGER);
 121
 122     wxModule::RegisterModules();
 123     if (!wxModule::InitializeModules()) return FALSE;
 124
 125     return TRUE;
 126 }
 127
 128 void wxApp::CleanUp()
 129 {
 130     delete wxWidgetHashTable;
 131     wxWidgetHashTable = NULL;
 132
 133     wxModule::CleanUpModules();
 134
 135 #if wxUSE_WX_RESOURCES
 136     wxCleanUpResourceSystem();
 137 #endif
 138
 139     wxDeleteStockObjects() ;
 140
 141     // Destroy all GDI lists, etc.
 142
 143     wxDeleteStockLists();
 144
 145     delete wxTheColourDatabase;
 146     wxTheColourDatabase = NULL;
 147
 148 #if wxUSE_POSTSCRIPT
 149     /* Done using wxModule now
 150     wxInitializePrintSetupData(FALSE);
 151     delete wxThePrintPaperDatabase;
 152     wxThePrintPaperDatabase = NULL;
 153     */
 154 #endif
 155
 156     wxBitmap::CleanUpHandlers();
 157
 158     wxClassInfo::CleanUpClasses();
 159
 160     delete wxTheApp;
 161     wxTheApp = NULL;
 162
 163     // GL: I'm annoyed ... I don't know where to put this and I don't want to
 164     // create a module for that as it's part of the core.
 165 #if wxUSE_THREADS
 166     delete wxPendingEvents;
 167     delete wxPendingEventsLocker;
 168 #endif
 169
 170 #if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
 171     // At this point we want to check if there are any memory
 172     // blocks that aren't part of the wxDebugContext itself,
 173     // as a special case. Then when dumping we need to ignore
 174     // wxDebugContext, too.
 175     if (wxDebugContext::CountObjectsLeft(TRUE) > 0)
 176     {
 177         wxLogDebug("There were memory leaks.\n");
 178         wxDebugContext::Dump();
 179         wxDebugContext::PrintStatistics();
 180     }
 181 #endif
 182
 183     // do it as the very last thing because everything else can log messages
 184     wxLog::DontCreateOnDemand();
 185     // do it as the very last thing because everything else can log messages
 186     delete wxLog::SetActiveTarget(NULL);
 187 }
 188
 189 int wxEntry( int argc, char *argv[] )
 190 {
 191 #if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
 192     // This seems to be necessary since there are 'rogue'
 193     // objects present at this point (perhaps global objects?)
 194     // Setting a checkpoint will ignore them as far as the
 195     // memory checking facility is concerned.
 196     // Of course you may argue that memory allocated in globals should be
 197     // checked, but this is a reasonable compromise.
 198     wxDebugContext::SetCheckpoint();
 199 #endif
 200
 201     if (!wxApp::Initialize())
 202         return FALSE;
 203
 204     if (!wxTheApp)
 205     {
 206         if (!wxApp::GetInitializerFunction())
 207         {
 208             printf( "wxWindows error: No initializer - use IMPLEMENT_APP macro.\n" );
 209             return 0;
 210         };
 211
 212         wxTheApp = (wxApp*) (* wxApp::GetInitializerFunction()) ();
 213     };
 214
 215     if (!wxTheApp)
 216     {
 217         printf( "wxWindows error: wxTheApp == NULL\n" );
 218         return 0;
 219     };
 220
 221     wxTheApp->SetClassName(wxFileNameFromPath(argv[0]));
 222     wxTheApp->SetAppName(wxFileNameFromPath(argv[0]));
 223
 224     wxTheApp->argc = argc;
 225     wxTheApp->argv = argv;
 226
 227     // GUI-specific initialization, such as creating an app context.
 228     wxTheApp->OnInitGui();
 229
 230     // Here frames insert themselves automatically into wxTopLevelWindows by
 231     // getting created in OnInit().
 232
 233     int retValue = 0;
 234     if (wxTheApp->OnInit())
 235     {
 236         if (wxTheApp->Initialized()) retValue = wxTheApp->OnRun();
 237     }
 238
 239     // flush the logged messages if any
 240     wxLog *pLog = wxLog::GetActiveTarget();
 241     if ( pLog != NULL && pLog->HasPendingMessages() )
 242         pLog->Flush();
 243
 244     delete wxLog::SetActiveTarget(new wxLogStderr); // So dialog boxes aren't used
 245     // for further messages
 246
 247     if (wxTheApp->GetTopWindow())
 248     {
 249         delete wxTheApp->GetTopWindow();
 250         wxTheApp->SetTopWindow(NULL);
 251     }
 252
 253     wxTheApp->DeletePendingObjects();
 254
 255     wxTheApp->OnExit();
 256
 257     wxApp::CleanUp();
 258
 259     return retValue;
 260 };
 261
 262 // Static member initialization
 263 wxAppInitializerFunction wxAppBase::m_appInitFn = (wxAppInitializerFunction) NULL;
 264
 265 wxApp::wxApp()
 266 {
 267     argc = 0;
 268     argv = NULL;
 269
 270     m_mainColormap = (WXColormap) NULL;
 271     m_appContext = (WXAppContext) NULL;
 272     m_topLevelWidget = (WXWidget) NULL;
 273     m_maxRequestSize = 0;
 274     m_initialDisplay = (WXDisplay*) 0;
 275 }
 276
 277 bool wxApp::Initialized()
 278 {
 279     if (GetTopWindow())
 280         return TRUE;
 281     else
 282         return FALSE;
 283 }
 284
 285 int wxApp::MainLoop()
 286 {
 287     m_keepGoing = TRUE;
 288
 289     /*
 290     * Sit around forever waiting to process X-events. Property Change
 291     * event are handled special, because they have to refer to
 292     * the root window rather than to a widget. therefore we can't
 293     * use an Xt-eventhandler.
 294     */
 295
 296     XSelectInput(XtDisplay((Widget) wxTheApp->GetTopLevelWidget()),
 297         XDefaultRootWindow(XtDisplay((Widget) wxTheApp->GetTopLevelWidget())),
 298         PropertyChangeMask);
 299
 300     XEvent event;
 301
 302     // Use this flag to allow breaking the loop via wxApp::ExitMainLoop()
 303     while (m_keepGoing)
 304     {
 305         XtAppNextEvent( (XtAppContext) wxTheApp->GetAppContext(), &event);
 306
 307         ProcessXEvent((WXEvent*) & event);
 308
 309         if (XtAppPending( (XtAppContext) wxTheApp->GetAppContext() ) == 0)
 310         {
 311             if (!ProcessIdle())
 312             {
 313 #if wxUSE_THREADS
 314                 // leave the main loop to give other threads a chance to
 315                 // perform their GUI work
 316                 wxMutexGuiLeave();
 317                 wxUsleep(20);
 318                 wxMutexGuiEnter();
 319 #endif
 320             }
 321         }
 322
 323     }
 324
 325     return 0;
 326 }
 327
 328 // Processes an X event.
 329 void wxApp::ProcessXEvent(WXEvent* _event)
 330 {
 331     XEvent* event = (XEvent*) _event;
 332
 333     if (event->type == KeyPress)
 334     {
 335 #if 0 // def __WXDEBUG__
 336         Widget widget = XtWindowToWidget(event->xany.display, event->xany.window);
 337         wxLogDebug("Got key press event for 0x%08x (parent = 0x%08x)",
 338                    widget, XtParent(widget));
 339 #endif // DEBUG
 340
 341     if (CheckForAccelerator(_event))
 342     {
 343             // Do nothing! We intercepted and processed the event as an
 344             // accelerator.
 345             return;
 346     }
 347 #if 1
 348         // It seemed before that this hack was redundant and
 349         // key down events were being generated by wxCanvasInputEvent.
 350         // But no longer - why ???
 351         //
 352     else if (CheckForKeyDown(_event))
 353     {
 354             // We intercepted and processed the key down event
 355             return;
 356     }
 357 #endif
 358     else
 359     {
 360             XtDispatchEvent(event);
 361         return;
 362     }
 363     }
 364     else if (event->type == KeyRelease)
 365     {
 366         // TODO: work out why we still need this !  -michael
 367         //
 368         if (CheckForKeyUp(_event))
 369     {
 370         // We intercepted and processed the key up event
 371         return;
 372     }
 373     else
 374     {
 375         XtDispatchEvent(event);
 376         return;
 377     }
 378     }
 379     else if (event->type == PropertyNotify)
 380     {
 381         HandlePropertyChange(_event);
 382         return;
 383     }
 384     else if (event->type == ResizeRequest)
 385     {
 386         /* Terry Gitnick <terryg@scientech.com> - 1/21/98
 387          * If resize event, don't resize until the last resize event for this
 388          * window is recieved. Prevents flicker as windows are resized.
 389          */
 390
 391         Display *disp = XtDisplay((Widget) wxTheApp->GetTopLevelWidget());
 392         Window win = event->xany.window;
 393         XEvent report;
 394
 395         //  to avoid flicker
 396         report = * event;
 397         while( XCheckTypedWindowEvent (disp, win, ResizeRequest, &report));
 398
 399         // TODO: when implementing refresh optimization, we can use
 400         // XtAddExposureToRegion to expand the window's paint region.
 401
 402         XtDispatchEvent(event);
 403     }
 404     else
 405     {
 406         XtDispatchEvent(event);
 407     }
 408 }
 409
 410 // Returns TRUE if more time is needed.
 411 bool wxApp::ProcessIdle()
 412 {
 413     wxIdleEvent event;
 414     event.SetEventObject(this);
 415     ProcessEvent(event);
 416
 417     return event.MoreRequested();
 418 }
 419
 420 void wxApp::ExitMainLoop()
 421 {
 422     m_keepGoing = FALSE;
 423 }
 424
 425 // Is a message/event pending?
 426 bool wxApp::Pending()
 427 {
 428     XFlush(XtDisplay( (Widget) wxTheApp->GetTopLevelWidget() ));
 429
 430     // Fix by Doug from STI, to prevent a stall if non-X event
 431     // is found.
 432     return ((XtAppPending( (XtAppContext) GetAppContext() ) & XtIMXEvent) != 0) ;
 433 }
 434
 435 // Dispatch a message.
 436 void wxApp::Dispatch()
 437 {
 438     //    XtAppProcessEvent( (XtAppContext) wxTheApp->GetAppContext(), XtIMAll);
 439
 440     XEvent event;
 441     XtAppNextEvent((XtAppContext) GetAppContext(), &event);
 442     ProcessXEvent((WXEvent*) & event);
 443 }
 444
 445 // This should be redefined in a derived class for
 446 // handling property change events for XAtom IPC.
 447 void wxApp::HandlePropertyChange(WXEvent *event)
 448 {
 449     // by default do nothing special
 450     XtDispatchEvent((XEvent*) event); /* let Motif do the work */
 451 }
 452
 453 void wxApp::OnIdle(wxIdleEvent& event)
 454 {
 455     static bool inOnIdle = FALSE;
 456
 457     // Avoid recursion (via ProcessEvent default case)
 458     if (inOnIdle)
 459         return;
 460
 461     inOnIdle = TRUE;
 462
 463     // If there are pending events, we must process them: pending events
 464     // are either events to the threads other than main or events posted
 465     // with wxPostEvent() functions
 466     // GRG: I have moved this here so that all pending events are processed
 467     //   before starting to delete any objects. This behaves better (in
 468     //   particular, wrt wxPostEvent) and is coherent with wxGTK's current
 469     //   behaviour. Also removed the '#if wxUSE_THREADS' around it.
 470     //  Changed Mar/2000 before 2.1.14
 471
 472     // Flush pending events.
 473     ProcessPendingEvents();
 474
 475     // 'Garbage' collection of windows deleted with Close().
 476     DeletePendingObjects();
 477
 478     // flush the logged messages if any
 479     wxLog *pLog = wxLog::GetActiveTarget();
 480     if ( pLog != NULL && pLog->HasPendingMessages() )
 481         pLog->Flush();
 482
 483     // Send OnIdle events to all windows
 484     bool needMore = SendIdleEvents();
 485
 486     if (needMore)
 487         event.RequestMore(TRUE);
 488
 489     inOnIdle = FALSE;
 490 }
 491
 492 void wxWakeUpIdle()
 493 {
 494     // **** please implement me! ****
 495     // Wake up the idle handler processor, even if it is in another thread...
 496 }
 497
 498
 499 // Send idle event to all top-level windows
 500 bool wxApp::SendIdleEvents()
 501 {
 502     bool needMore = FALSE;
 503
 504     wxWindowList::Node* node = wxTopLevelWindows.GetFirst();
 505     while (node)
 506     {
 507         wxWindow* win = node->GetData();
 508         if (SendIdleEvents(win))
 509             needMore = TRUE;
 510         node = node->GetNext();
 511     }
 512
 513     return needMore;
 514 }
 515
 516 // Send idle event to window and all subwindows
 517 bool wxApp::SendIdleEvents(wxWindow* win)
 518 {
 519     bool needMore = FALSE;
 520
 521     wxIdleEvent event;
 522     event.SetEventObject(win);
 523     win->ProcessEvent(event);
 524
 525     if (event.MoreRequested())
 526         needMore = TRUE;
 527
 528     wxNode* node = win->GetChildren().First();
 529     while (node)
 530     {
 531         wxWindow* win = (wxWindow*) node->Data();
 532         if (SendIdleEvents(win))
 533             needMore = TRUE;
 534
 535         node = node->Next();
 536     }
 537     return needMore ;
 538 }
 539
 540 void wxApp::DeletePendingObjects()
 541 {
 542     wxNode *node = wxPendingDelete.First();
 543     while (node)
 544     {
 545         wxObject *obj = (wxObject *)node->Data();
 546
 547         delete obj;
 548
 549         if (wxPendingDelete.Member(obj))
 550             delete node;
 551
 552         // Deleting one object may have deleted other pending
 553         // objects, so start from beginning of list again.
 554         node = wxPendingDelete.First();
 555     }
 556 }
 557
 558 static char *fallbackResources[] = {
 559     "*menuBar.marginHeight: 0",
 560     "*menuBar.shadowThickness: 1",
 561     "*background: #c0c0c0",
 562     "*foreground: black",
 563     NULL
 564 };
 565
 566 // Create an application context
 567 bool wxApp::OnInitGui()
 568 {
 569     XtToolkitInitialize() ;
 570     wxTheApp->m_appContext = (WXAppContext) XtCreateApplicationContext();
 571     XtAppSetFallbackResources((XtAppContext) wxTheApp->m_appContext, fallbackResources);
 572
 573     Display *dpy = XtOpenDisplay((XtAppContext) wxTheApp->m_appContext,(String)NULL,NULL,
 574         (const char*) wxTheApp->GetClassName(), NULL, 0,
 575 # if XtSpecificationRelease < 5
 576         (Cardinal*) &argc,
 577 # else
 578         &argc,
 579 # endif
 580         argv);
 581
 582     if (!dpy) {
 583          // if you don't log to stderr, nothing will be shown...
 584         delete wxLog::SetActiveTarget(new wxLogStderr);
 585         wxString className(wxTheApp->GetClassName());
 586         wxLogError(_("wxWindows could not open display for '%s': exiting."),
 587                    (const char*) className);
 588         exit(-1);
 589     }
 590     m_initialDisplay = (WXDisplay*) dpy;
 591
 592 #ifdef __WXDEBUG__
 593     // install the X error handler
 594     gs_pfnXErrorHandler = XSetErrorHandler(wxXErrorHandler);
 595 #endif // __WXDEBUG__
 596
 597     wxTheApp->m_topLevelWidget = (WXWidget) XtAppCreateShell((String)NULL, (const char*) wxTheApp->GetClassName(),
 598         applicationShellWidgetClass,dpy,
 599         NULL,0) ;
 600
 601     // Add general resize proc
 602     XtActionsRec rec;
 603     rec.string = "resize";
 604     rec.proc = (XtActionProc)wxWidgetResizeProc;
 605     XtAppAddActions((XtAppContext) wxTheApp->m_appContext, &rec, 1);
 606
 607     GetMainColormap(dpy);
 608     m_maxRequestSize = XMaxRequestSize((Display*) dpy);
 609
 610     return TRUE;
 611 }
 612
 613 WXColormap wxApp::GetMainColormap(WXDisplay* display)
 614 {
 615     if (!display) /* Must be called first with non-NULL display */
 616         return m_mainColormap;
 617
 618     int defaultScreen = DefaultScreen((Display*) display);
 619     Screen* screen = XScreenOfDisplay((Display*) display, defaultScreen);
 620
 621     Colormap c = DefaultColormapOfScreen(screen);
 622
 623     if (!m_mainColormap)
 624         m_mainColormap = (WXColormap) c;
 625
 626     return (WXColormap) c;
 627 }
 628
 629 // Returns TRUE if an accelerator has been processed
 630 bool wxApp::CheckForAccelerator(WXEvent* event)
 631 {
 632     XEvent* xEvent = (XEvent*) event;
 633     if (xEvent->xany.type == KeyPress)
 634     {
 635         // Find a wxWindow for this window
 636         // TODO: should get display for the window, not the current display
 637         Widget widget = XtWindowToWidget((Display*) wxGetDisplay(), xEvent->xany.window);
 638         wxWindow* win = NULL;
 639
 640         // Find the first wxWindow that corresponds to this event window
 641         while (widget && !(win = wxGetWindowFromTable(widget)))
 642             widget = XtParent(widget);
 643
 644         if (!widget || !win)
 645             return FALSE;
 646
 647         wxKeyEvent keyEvent(wxEVT_CHAR);
 648         wxTranslateKeyEvent(keyEvent, win, (Widget) 0, xEvent);
 649
 650         // Now we have a wxKeyEvent and we have a wxWindow.
 651         // Go up the hierarchy until we find a matching accelerator,
 652         // or we get to the top.
 653         while (win)
 654         {
 655             if (win->ProcessAccelerator(keyEvent))
 656                 return TRUE;
 657             win = win->GetParent();
 658         }
 659         return FALSE;
 660     }
 661     return FALSE;
 662 }
 663
 664 bool wxApp::CheckForKeyDown(WXEvent* event)
 665 {
 666     XEvent* xEvent = (XEvent*) event;
 667     if (xEvent->xany.type == KeyPress)
 668     {
 669         Widget widget = XtWindowToWidget((Display*) wxGetDisplay(),
 670                      xEvent->xany.window);
 671     wxWindow* win = NULL;
 672
 673     // Find the first wxWindow that corresponds to this event window
 674     while (widget && !(win = wxGetWindowFromTable(widget)))
 675             widget = XtParent(widget);
 676
 677     if (!widget || !win)
 678             return FALSE;
 679
 680     wxKeyEvent keyEvent(wxEVT_KEY_DOWN);
 681     wxTranslateKeyEvent(keyEvent, win, (Widget) 0, xEvent);
 682
 683     return win->ProcessEvent( keyEvent );
 684     }
 685
 686     return FALSE;
 687 }
 688
 689 bool wxApp::CheckForKeyUp(WXEvent* event)
 690 {
 691     XEvent* xEvent = (XEvent*) event;
 692     if (xEvent->xany.type == KeyRelease)
 693     {
 694         Widget widget = XtWindowToWidget((Display*) wxGetDisplay(),
 695                          xEvent->xany.window);
 696         wxWindow* win = NULL;
 697
 698         // Find the first wxWindow that corresponds to this event window
 699         while (widget && !(win = wxGetWindowFromTable(widget)))
 700                 widget = XtParent(widget);
 701
 702         if (!widget || !win)
 703                 return FALSE;
 704
 705         wxKeyEvent keyEvent(wxEVT_KEY_UP);
 706         wxTranslateKeyEvent(keyEvent, win, (Widget) 0, xEvent);
 707
 708         return win->ProcessEvent( keyEvent );
 709     }
 710
 711     return FALSE;
 712 }
 713
 714 void wxExit()
 715 {
 716     int retValue = 0;
 717     if (wxTheApp)
 718         retValue = wxTheApp->OnExit();
 719
 720     wxApp::CleanUp();
 721     /*
 722     * Exit in some platform-specific way. Not recommended that the app calls this:
 723     * only for emergencies.
 724     */
 725     exit(retValue);
 726 }
 727
 728 // Yield to other processes
 729
 730 bool wxApp::Yield(bool onlyIfNeeded)
 731 {
 732     bool s_inYield = FALSE;
 733
 734     if ( s_inYield )
 735     {
 736         if ( !onlyIfNeeded )
 737         {
 738             wxFAIL_MSG( wxT("wxYield called recursively" ) );
 739         }
 740
 741         return FALSE;
 742     }
 743
 744     s_inYield = TRUE;
 745
 746     while (wxTheApp && wxTheApp->Pending())
 747         wxTheApp->Dispatch();
 748
 749     s_inYield = FALSE;
 750
 751     return TRUE;
 752 }
 753
 754 // ----------------------------------------------------------------------------
 755 // accessors for C modules
 756 // ----------------------------------------------------------------------------
 757
 758 extern "C" XtAppContext wxGetAppContext()
 759 {
 760     return (XtAppContext)wxTheApp->GetAppContext();
 761 }