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/icon.h"
  21 #include "wx/dialog.h"
  22 #include "wx/log.h"
  23 #include "wx/module.h"
  24 #include "wx/memory.h"
  25 #include "wx/log.h"
  26 #include "wx/intl.h"
  27 #include "wx/evtloop.h"
  28
  29 #include "wx/univ/theme.h"
  30 #include "wx/univ/renderer.h"
  31
  32 #if wxUSE_THREADS
  33     #include "wx/thread.h"
  34 #endif
  35
  36 #if wxUSE_WX_RESOURCES
  37     #include "wx/resource.h"
  38 #endif
  39
  40 #include "wx/x11/private.h"
  41
  42 #include <string.h>
  43
  44 //------------------------------------------------------------------------
  45 //   global data
  46 //------------------------------------------------------------------------
  47
  48 extern wxList wxPendingDelete;
  49
  50 wxHashTable *wxWidgetHashTable = NULL;
  51
  52 wxApp *wxTheApp = NULL;
  53
  54 // This is set within wxEntryStart -- too early on
  55 // to put these in wxTheApp
  56 static int g_newArgc = 0;
  57 static wxChar** g_newArgv = NULL;
  58 static bool g_showIconic = FALSE;
  59 static wxSize g_initialSize = wxDefaultSize;
  60
  61 // This is required for wxFocusEvent::SetWindow(). It will only
  62 // work for focus events which we provoke ourselves (by calling
  63 // SetFocus()). It will not work for those events, which X11
  64 // generates itself.
  65 static wxWindow *g_nextFocus = NULL;
  66 static wxWindow *g_prevFocus = NULL;
  67
  68 //------------------------------------------------------------------------
  69 //   X11 error handling
  70 //------------------------------------------------------------------------
  71
  72 #ifdef __WXDEBUG__
  73 typedef int (*XErrorHandlerFunc)(Display *, XErrorEvent *);
  74
  75 XErrorHandlerFunc gs_pfnXErrorHandler = 0;
  76
  77 static int wxXErrorHandler(Display *dpy, XErrorEvent *xevent)
  78 {
  79     // just forward to the default handler for now
  80     if (gs_pfnXErrorHandler)
  81         return gs_pfnXErrorHandler(dpy, xevent);
  82     else
  83         return 0;
  84 }
  85 #endif // __WXDEBUG__
  86
  87 //------------------------------------------------------------------------
  88 //   wxApp
  89 //------------------------------------------------------------------------
  90
  91 long wxApp::sm_lastMessageTime = 0;
  92 WXDisplay *wxApp::ms_display = NULL;
  93
  94 IMPLEMENT_DYNAMIC_CLASS(wxApp, wxEvtHandler)
  95
  96 BEGIN_EVENT_TABLE(wxApp, wxEvtHandler)
  97     EVT_IDLE(wxApp::OnIdle)
  98 END_EVENT_TABLE()
  99
 100 bool wxApp::Initialize()
 101 {
 102     wxClassInfo::InitializeClasses();
 103
 104     // GL: I'm annoyed ... I don't know where to put this and I don't want to
 105     // create a module for that as it's part of the core.
 106 #if wxUSE_THREADS
 107     wxPendingEventsLocker = new wxCriticalSection();
 108 #endif
 109
 110     wxTheColourDatabase = new wxColourDatabase(wxKEY_STRING);
 111     wxTheColourDatabase->Initialize();
 112
 113     wxInitializeStockLists();
 114     wxInitializeStockObjects();
 115
 116 #if wxUSE_WX_RESOURCES
 117     wxInitializeResourceSystem();
 118 #endif
 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     if (g_newArgv)
 131         delete[] g_newArgv;
 132     g_newArgv = NULL;
 133
 134     delete wxWidgetHashTable;
 135     wxWidgetHashTable = NULL;
 136
 137     wxModule::CleanUpModules();
 138
 139 #if wxUSE_WX_RESOURCES
 140     wxCleanUpResourceSystem();
 141 #endif
 142
 143     delete wxTheColourDatabase;
 144     wxTheColourDatabase = NULL;
 145
 146     wxDeleteStockObjects();
 147
 148     wxDeleteStockLists();
 149
 150     delete wxTheApp;
 151     wxTheApp = NULL;
 152
 153     wxClassInfo::CleanUpClasses();
 154
 155 #if wxUSE_THREADS
 156     delete wxPendingEvents;
 157     delete wxPendingEventsLocker;
 158 #endif
 159
 160 #if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
 161     // At this point we want to check if there are any memory
 162     // blocks that aren't part of the wxDebugContext itself,
 163     // as a special case. Then when dumping we need to ignore
 164     // wxDebugContext, too.
 165     if (wxDebugContext::CountObjectsLeft(TRUE) > 0)
 166     {
 167         wxLogDebug("There were memory leaks.");
 168         wxDebugContext::Dump();
 169         wxDebugContext::PrintStatistics();
 170     }
 171 #endif
 172
 173     // do it as the very last thing because everything else can log messages
 174     wxLog::DontCreateOnDemand();
 175     // do it as the very last thing because everything else can log messages
 176     delete wxLog::SetActiveTarget(NULL);
 177 }
 178
 179 // NB: argc and argv may be changed here, pass by reference!
 180 int wxEntryStart( int& argc, char *argv[] )
 181 {
 182 #ifdef __WXDEBUG__
 183     // install the X error handler
 184     gs_pfnXErrorHandler = XSetErrorHandler( wxXErrorHandler );
 185 #endif // __WXDEBUG__
 186
 187     wxString displayName;
 188     bool syncDisplay = FALSE;
 189
 190     // Parse the arguments.
 191     // We can't use wxCmdLineParser or OnInitCmdLine and friends because
 192     // we have to create the Display earlier. If we can find a way to
 193     // use the wxAppBase API then I'll be quite happy to change it.
 194     g_newArgv = new wxChar*[argc];
 195     g_newArgc = 0;
 196     int i;
 197     for (i = 0; i < argc; i++)
 198     {
 199         wxString arg(argv[i]);
 200         if (arg == wxT("-display"))
 201         {
 202             if (i < (argc - 1))
 203             {
 204                 i ++;
 205                 displayName = argv[i];
 206                 continue;
 207             }
 208         }
 209         else if (arg == wxT("-geometry"))
 210         {
 211             if (i < (argc - 1))
 212             {
 213                 i ++;
 214                 wxString windowGeometry = argv[i];
 215                 int w, h;
 216                 if (wxSscanf(windowGeometry.c_str(), _T("%dx%d"), &w, &h) != 2)
 217                 {
 218                     wxLogError(_("Invalid geometry specification '%s'"), windowGeometry.c_str());
 219                 }
 220                 else
 221                 {
 222                     g_initialSize = wxSize(w, h);
 223                 }
 224                 continue;
 225             }
 226         }
 227         else if (arg == wxT("-sync"))
 228         {
 229             syncDisplay = TRUE;
 230             continue;
 231         }
 232         else if (arg == wxT("-iconic"))
 233         {
 234             g_showIconic = TRUE;
 235
 236             continue;
 237         }
 238
 239         // Not eaten by wxWindows, so pass through
 240         g_newArgv[g_newArgc] = argv[i];
 241         g_newArgc ++;
 242     }
 243
 244     Display* xdisplay = NULL;
 245     if (displayName.IsEmpty())
 246         xdisplay = XOpenDisplay(NULL);
 247     else
 248         xdisplay = XOpenDisplay((char*) displayName.c_str());
 249
 250     if (!xdisplay)
 251     {
 252         wxLogError( _("wxWindows could not open display. Exiting.") );
 253         return -1;
 254     }
 255
 256     if (syncDisplay)
 257     {
 258         XSynchronize(xdisplay, True);
 259     }
 260
 261     wxApp::ms_display = (WXDisplay*) xdisplay;
 262
 263     XSelectInput( xdisplay, XDefaultRootWindow(xdisplay), PropertyChangeMask);
 264
 265     wxSetDetectableAutoRepeat( TRUE );
 266
 267     if (!wxApp::Initialize())
 268         return -1;
 269
 270     return 0;
 271 }
 272
 273 int wxEntryInitGui()
 274 {
 275     int retValue = 0;
 276
 277     if ( !wxTheApp->OnInitGui() )
 278         retValue = -1;
 279
 280     return retValue;
 281 }
 282
 283
 284 int wxEntry( int argc, char *argv[] )
 285 {
 286 #if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
 287     // This seems to be necessary since there are 'rogue'
 288     // objects present at this point (perhaps global objects?)
 289     // Setting a checkpoint will ignore them as far as the
 290     // memory checking facility is concerned.
 291     // Of course you may argue that memory allocated in globals should be
 292     // checked, but this is a reasonable compromise.
 293     wxDebugContext::SetCheckpoint();
 294 #endif
 295     int err = wxEntryStart(argc, argv);
 296     if (err)
 297         return err;
 298
 299     if (!wxTheApp)
 300     {
 301         if (!wxApp::GetInitializerFunction())
 302         {
 303             printf( "wxWindows error: No initializer - use IMPLEMENT_APP macro.\n" );
 304             return 0;
 305         };
 306
 307         wxTheApp = (wxApp*) (* wxApp::GetInitializerFunction()) ();
 308     };
 309
 310     if (!wxTheApp)
 311     {
 312         printf( "wxWindows error: wxTheApp == NULL\n" );
 313         return 0;
 314     };
 315
 316     wxTheApp->SetClassName(wxFileNameFromPath(argv[0]));
 317     wxTheApp->SetAppName(wxFileNameFromPath(argv[0]));
 318
 319     // The command line may have been changed
 320     // by stripping out -display etc.
 321     if (g_newArgc > 0)
 322     {
 323         wxTheApp->argc = g_newArgc;
 324         wxTheApp->argv = g_newArgv;
 325     }
 326     else
 327     {
 328         wxTheApp->argc = argc;
 329         wxTheApp->argv = argv;
 330     }
 331     wxTheApp->m_showIconic = g_showIconic;
 332     wxTheApp->m_initialSize = g_initialSize;
 333
 334     int retValue;
 335     retValue = wxEntryInitGui();
 336
 337     // Here frames insert themselves automatically into wxTopLevelWindows by
 338     // getting created in OnInit().
 339     if ( retValue == 0 )
 340     {
 341         if ( !wxTheApp->OnInit() )
 342             retValue = -1;
 343     }
 344
 345     if ( retValue == 0 )
 346     {
 347         if (wxTheApp->Initialized()) retValue = wxTheApp->OnRun();
 348     }
 349
 350     // flush the logged messages if any
 351     wxLog *pLog = wxLog::GetActiveTarget();
 352     if ( pLog != NULL && pLog->HasPendingMessages() )
 353         pLog->Flush();
 354
 355     delete wxLog::SetActiveTarget(new wxLogStderr); // So dialog boxes aren't used
 356     // for further messages
 357
 358     if (wxTheApp->GetTopWindow())
 359     {
 360         delete wxTheApp->GetTopWindow();
 361         wxTheApp->SetTopWindow(NULL);
 362     }
 363
 364     wxTheApp->DeletePendingObjects();
 365
 366     wxTheApp->OnExit();
 367
 368     wxApp::CleanUp();
 369
 370     return retValue;
 371 };
 372
 373 // Static member initialization
 374 wxAppInitializerFunction wxAppBase::m_appInitFn = (wxAppInitializerFunction) NULL;
 375
 376 wxApp::wxApp()
 377 {
 378     m_topWindow = NULL;
 379     wxTheApp = this;
 380     m_className = "";
 381     m_wantDebugOutput = TRUE ;
 382     m_appName = "";
 383     argc = 0;
 384     argv = NULL;
 385     m_exitOnFrameDelete = TRUE;
 386     m_mainColormap = (WXColormap) NULL;
 387     m_topLevelWidget = (WXWindow) NULL;
 388     m_maxRequestSize = 0;
 389     m_mainLoop = NULL;
 390     m_showIconic = FALSE;
 391     m_initialSize = wxDefaultSize;
 392 }
 393
 394 bool wxApp::Initialized()
 395 {
 396     if (GetTopWindow())
 397         return TRUE;
 398     else
 399         return FALSE;
 400 }
 401
 402 int wxApp::MainLoop()
 403 {
 404      int rt;
 405     m_mainLoop = new wxEventLoop;
 406
 407     rt = m_mainLoop->Run();
 408
 409     delete m_mainLoop;
 410     m_mainLoop = NULL;
 411     return rt;
 412 }
 413
 414 #if !wxUSE_NANOX
 415 //-----------------------------------------------------------------------
 416 // X11 predicate function for exposure compression
 417 //-----------------------------------------------------------------------
 418
 419 struct wxExposeInfo
 420 {
 421     Window window;
 422     Bool found_non_matching;
 423 };
 424
 425 static Bool expose_predicate (Display *display, XEvent *xevent, XPointer arg)
 426 {
 427     wxExposeInfo *info = (wxExposeInfo*) arg;
 428
 429     if (info->found_non_matching)
 430        return FALSE;
 431
 432     if (xevent->xany.type != Expose)
 433     {
 434         info->found_non_matching = TRUE;
 435         return FALSE;
 436     }
 437
 438     if (xevent->xexpose.window != info->window)
 439     {
 440         info->found_non_matching = TRUE;
 441         return FALSE;
 442     }
 443
 444     return TRUE;
 445 }
 446 #endif
 447     // wxUSE_NANOX
 448
 449 //-----------------------------------------------------------------------
 450 // Processes an X event.
 451 //-----------------------------------------------------------------------
 452
 453 void wxApp::ProcessXEvent(WXEvent* _event)
 454 {
 455     XEvent* event = (XEvent*) _event;
 456
 457     wxWindow* win = NULL;
 458     Window window = XEventGetWindow(event);
 459     Window actualWindow = window;
 460
 461     // Find the first wxWindow that corresponds to this event window
 462     // Because we're receiving events after a window
 463     // has been destroyed, assume a 1:1 match between
 464     // Window and wxWindow, so if it's not in the table,
 465     // it must have been destroyed.
 466
 467     win = wxGetWindowFromTable(window);
 468     if (!win)
 469             return;
 470
 471 #ifdef __WXDEBUG__
 472     wxString windowClass = win->GetClassInfo()->GetClassName();
 473 #endif
 474
 475     switch (event->type)
 476     {
 477         case KeyPress:
 478         {
 479             if (!win->IsEnabled())
 480                 return;
 481
 482             wxKeyEvent keyEvent(wxEVT_KEY_DOWN);
 483             wxTranslateKeyEvent(keyEvent, win, window, event);
 484
 485             // wxLogDebug( "OnKey from %s", win->GetName().c_str() );
 486
 487             // We didn't process wxEVT_KEY_DOWN, so send
 488             // wxEVT_CHAR
 489             if (!win->GetEventHandler()->ProcessEvent( keyEvent ))
 490             {
 491                 keyEvent.SetEventType(wxEVT_CHAR);
 492                 win->GetEventHandler()->ProcessEvent( keyEvent );
 493             }
 494             return;
 495         }
 496         case KeyRelease:
 497         {
 498             if (!win->IsEnabled())
 499                 return;
 500
 501             wxKeyEvent keyEvent(wxEVT_KEY_UP);
 502             wxTranslateKeyEvent(keyEvent, win, window, event);
 503
 504             win->GetEventHandler()->ProcessEvent( keyEvent );
 505             return;
 506         }
 507         case ConfigureNotify:
 508         {
 509 #if wxUSE_NANOX
 510             if (event->update.utype == GR_UPDATE_SIZE)
 511 #endif
 512             {
 513                 //wxLogDebug("ConfigureNotify: %s", windowClass.c_str());
 514                 wxSizeEvent sizeEvent( wxSize(XConfigureEventGetWidth(event), XConfigureEventGetHeight(event)), win->GetId() );
 515                 sizeEvent.SetEventObject( win );
 516
 517                 win->GetEventHandler()->ProcessEvent( sizeEvent );
 518             }
 519         }
 520 #if !wxUSE_NANOX
 521         case PropertyNotify:
 522         {
 523             //wxLogDebug("PropertyNotify: %s", windowClass.c_str());
 524             HandlePropertyChange(_event);
 525             return;
 526         }
 527         case ClientMessage:
 528         {
 529             if (!win->IsEnabled())
 530                 return;
 531
 532             Atom wm_delete_window = XInternAtom(wxGlobalDisplay(), "WM_DELETE_WINDOW", True);
 533             Atom wm_protocols = XInternAtom(wxGlobalDisplay(), "WM_PROTOCOLS", True);
 534
 535             if (event->xclient.message_type == wm_protocols)
 536             {
 537                 if ((Atom) (event->xclient.data.l[0]) == wm_delete_window)
 538                 {
 539                     win->Close(FALSE);
 540                 }
 541             }
 542             return;
 543         }
 544         case ResizeRequest:
 545         {
 546             /*
 547             * If resize event, don't resize until the last resize event for this
 548             * window is recieved. Prevents flicker as windows are resized.
 549             */
 550
 551             Display *disp = (Display*) wxGetDisplay();
 552             XEvent report;
 553
 554             //  to avoid flicker
 555             report = * event;
 556             while( XCheckTypedWindowEvent (disp, actualWindow, ResizeRequest, &report));
 557
 558             if (win)
 559             {
 560                 wxSize sz = win->GetSize();
 561                 wxSizeEvent sizeEvent(sz, win->GetId());
 562                 sizeEvent.SetEventObject(win);
 563
 564                 win->GetEventHandler()->ProcessEvent( sizeEvent );
 565             }
 566
 567             return;
 568         }
 569 #endif
 570 #if wxUSE_NANOX
 571         case GR_EVENT_TYPE_CLOSE_REQ:
 572         {
 573             if (win)
 574             {
 575                 win->Close(FALSE);
 576             }
 577             break;
 578         }
 579 #endif
 580         case Expose:
 581         {
 582             //wxLogDebug("Expose: %s", windowClass.c_str());
 583             win->GetUpdateRegion().Union( XExposeEventGetX(event), XExposeEventGetY(event),
 584                                           XExposeEventGetWidth(event), XExposeEventGetHeight(event));
 585
 586             win->GetClearRegion().Union( XExposeEventGetX(event), XExposeEventGetY(event),
 587                                          XExposeEventGetWidth(event), XExposeEventGetHeight(event));
 588
 589
 590 #if !wxUSE_NANOX
 591             XEvent tmp_event;
 592             wxExposeInfo info;
 593             info.window = event->xexpose.window;
 594             info.found_non_matching = FALSE;
 595             while (XCheckIfEvent( wxGlobalDisplay(), &tmp_event, expose_predicate, (XPointer) &info ))
 596             {
 597                 win->GetUpdateRegion().Union( tmp_event.xexpose.x, tmp_event.xexpose.y,
 598                                               tmp_event.xexpose.width, tmp_event.xexpose.height );
 599
 600                 win->GetClearRegion().Union( tmp_event.xexpose.x, tmp_event.xexpose.y,
 601                                              tmp_event.xexpose.width, tmp_event.xexpose.height );
 602             }
 603 #endif
 604
 605             win->SendEraseEvents();
 606
 607             return;
 608         }
 609 #if !wxUSE_NANOX
 610         case GraphicsExpose:
 611         {
 612             // wxLogDebug( "GraphicsExpose from %s", win->GetName().c_str(),
 613             //                              event->xgraphicsexpose.x, event->xgraphicsexpose.y,
 614             //                              event->xgraphicsexpose.width, event->xgraphicsexpose.height);
 615
 616             win->GetUpdateRegion().Union( event->xgraphicsexpose.x, event->xgraphicsexpose.y,
 617                                           event->xgraphicsexpose.width, event->xgraphicsexpose.height);
 618
 619             win->GetClearRegion().Union( event->xgraphicsexpose.x, event->xgraphicsexpose.y,
 620                                          event->xgraphicsexpose.width, event->xgraphicsexpose.height);
 621
 622             if (event->xgraphicsexpose.count == 0)
 623             {
 624                 // Only erase background, paint in idle time.
 625                 win->SendEraseEvents();
 626             }
 627
 628             return;
 629         }
 630 #endif
 631         case EnterNotify:
 632         case LeaveNotify:
 633         case ButtonPress:
 634         case ButtonRelease:
 635         case MotionNotify:
 636         {
 637             if (!win->IsEnabled())
 638                 return;
 639
 640             // Here we check if the top level window is
 641             // disabled, which is one aspect of modality.
 642             wxWindow *tlw = win;
 643             while (tlw && !tlw->IsTopLevel())
 644                 tlw = tlw->GetParent();
 645             if (tlw && !tlw->IsEnabled())
 646                 return;
 647
 648             if (event->type == ButtonPress)
 649             {
 650                 if ((win != wxWindow::FindFocus()) && win->AcceptsFocus())
 651                 {
 652                     // This might actually be done in wxWindow::SetFocus()
 653                     // and not here.
 654                     g_prevFocus = wxWindow::FindFocus();
 655                     g_nextFocus = win;
 656
 657                     win->SetFocus();
 658                 }
 659             }
 660
 661             wxMouseEvent wxevent;
 662             wxTranslateMouseEvent(wxevent, win, window, event);
 663             win->GetEventHandler()->ProcessEvent( wxevent );
 664             return;
 665         }
 666         case FocusIn:
 667             {
 668 #if !wxUSE_NANOX
 669                 if ((event->xfocus.detail != NotifyPointer) &&
 670                     (event->xfocus.mode == NotifyNormal))
 671 #endif
 672                 {
 673                     // wxLogDebug( "FocusIn from %s of type %s", win->GetName().c_str(), win->GetClassInfo()->GetClassName() );
 674
 675                     wxFocusEvent focusEvent(wxEVT_SET_FOCUS, win->GetId());
 676                     focusEvent.SetEventObject(win);
 677                     focusEvent.SetWindow( g_prevFocus );
 678                     g_prevFocus = NULL;
 679
 680                     win->GetEventHandler()->ProcessEvent(focusEvent);
 681                 }
 682                 break;
 683             }
 684         case FocusOut:
 685             {
 686 #if !wxUSE_NANOX
 687                 if ((event->xfocus.detail != NotifyPointer) &&
 688                     (event->xfocus.mode == NotifyNormal))
 689 #endif
 690                 {
 691                     // wxLogDebug( "FocusOut from %s of type %s", win->GetName().c_str(), win->GetClassInfo()->GetClassName() );
 692
 693                     wxFocusEvent focusEvent(wxEVT_KILL_FOCUS, win->GetId());
 694                     focusEvent.SetEventObject(win);
 695                     focusEvent.SetWindow( g_nextFocus );
 696                     g_nextFocus = NULL;
 697                     win->GetEventHandler()->ProcessEvent(focusEvent);
 698                 }
 699                 break;
 700             }
 701 #ifndef wxUSE_NANOX
 702          case DestroyNotify:
 703             {
 704                 // Do we want to process this (for top-level windows)?
 705                 // But we want to be able to veto closes, anyway
 706                 break;
 707             }
 708 #endif
 709         default:
 710         {
 711 #ifdef __WXDEBUG__
 712             //wxString eventName = wxGetXEventName(XEvent& event);
 713             //wxLogDebug(wxT("Event %s not handled"), eventName.c_str());
 714 #endif
 715             break;
 716         }
 717     }
 718 }
 719
 720 // Returns TRUE if more time is needed.
 721 // Note that this duplicates wxEventLoopImpl::SendIdleEvent
 722 // but ProcessIdle may be needed by apps, so is kept.
 723 bool wxApp::ProcessIdle()
 724 {
 725     wxIdleEvent event;
 726     event.SetEventObject(this);
 727     ProcessEvent(event);
 728
 729     return event.MoreRequested();
 730 }
 731
 732 void wxApp::ExitMainLoop()
 733 {
 734     if (m_mainLoop)
 735         m_mainLoop->Exit(0);
 736 }
 737
 738 // Is a message/event pending?
 739 bool wxApp::Pending()
 740 {
 741     return wxEventLoop::GetActive()->Pending();
 742 }
 743
 744 // Dispatch a message.
 745 void wxApp::Dispatch()
 746 {
 747     wxEventLoop::GetActive()->Dispatch();
 748 }
 749
 750 // This should be redefined in a derived class for
 751 // handling property change events for XAtom IPC.
 752 void wxApp::HandlePropertyChange(WXEvent *event)
 753 {
 754     // by default do nothing special
 755     // TODO: what to do for X11
 756     // XtDispatchEvent((XEvent*) event);
 757 }
 758
 759 void wxApp::OnIdle(wxIdleEvent& event)
 760 {
 761     static bool s_inOnIdle = FALSE;
 762
 763     // Avoid recursion (via ProcessEvent default case)
 764     if (s_inOnIdle)
 765         return;
 766
 767     s_inOnIdle = TRUE;
 768
 769     // Resend in the main thread events which have been prepared in other
 770     // threads
 771     ProcessPendingEvents();
 772
 773     // 'Garbage' collection of windows deleted with Close()
 774     DeletePendingObjects();
 775
 776     // Send OnIdle events to all windows
 777     bool needMore = SendIdleEvents();
 778
 779     if (needMore)
 780         event.RequestMore(TRUE);
 781
 782     s_inOnIdle = FALSE;
 783 }
 784
 785 void wxWakeUpIdle()
 786 {
 787     // **** please implement me! ****
 788     // Wake up the idle handler processor, even if it is in another thread...
 789 }
 790
 791
 792 // Send idle event to all top-level windows
 793 bool wxApp::SendIdleEvents()
 794 {
 795     bool needMore = FALSE;
 796
 797     wxWindowList::Node* node = wxTopLevelWindows.GetFirst();
 798     while (node)
 799     {
 800         wxWindow* win = node->GetData();
 801         if (SendIdleEvents(win))
 802             needMore = TRUE;
 803         node = node->GetNext();
 804     }
 805
 806     return needMore;
 807 }
 808
 809 // Send idle event to window and all subwindows
 810 bool wxApp::SendIdleEvents(wxWindow* win)
 811 {
 812     bool needMore = FALSE;
 813
 814     wxIdleEvent event;
 815     event.SetEventObject(win);
 816
 817     win->GetEventHandler()->ProcessEvent(event);
 818
 819     win->OnInternalIdle();
 820
 821     if (event.MoreRequested())
 822         needMore = TRUE;
 823
 824     wxNode* node = win->GetChildren().First();
 825     while (node)
 826     {
 827         wxWindow* win = (wxWindow*) node->Data();
 828         if (SendIdleEvents(win))
 829             needMore = TRUE;
 830
 831         node = node->Next();
 832     }
 833
 834     return needMore;
 835 }
 836
 837 void wxApp::DeletePendingObjects()
 838 {
 839     wxNode *node = wxPendingDelete.First();
 840     while (node)
 841     {
 842         wxObject *obj = (wxObject *)node->Data();
 843
 844         delete obj;
 845
 846         if (wxPendingDelete.Member(obj))
 847             delete node;
 848
 849         // Deleting one object may have deleted other pending
 850         // objects, so start from beginning of list again.
 851         node = wxPendingDelete.First();
 852     }
 853 }
 854
 855 // Create display, and other initialization
 856 bool wxApp::OnInitGui()
 857 {
 858     // Eventually this line will be removed, but for
 859     // now we don't want to try popping up a dialog
 860     // for error messages.
 861     delete wxLog::SetActiveTarget(new wxLogStderr);
 862
 863     if (!wxAppBase::OnInitGui())
 864         return FALSE;
 865
 866     GetMainColormap( wxApp::GetDisplay() );
 867
 868     m_maxRequestSize = XMaxRequestSize( (Display*) wxApp::GetDisplay() );
 869
 870     return TRUE;
 871 }
 872
 873 WXColormap wxApp::GetMainColormap(WXDisplay* display)
 874 {
 875     if (!display) /* Must be called first with non-NULL display */
 876         return m_mainColormap;
 877
 878     int defaultScreen = DefaultScreen((Display*) display);
 879     Screen* screen = XScreenOfDisplay((Display*) display, defaultScreen);
 880
 881     Colormap c = DefaultColormapOfScreen(screen);
 882
 883     if (!m_mainColormap)
 884         m_mainColormap = (WXColormap) c;
 885
 886     return (WXColormap) c;
 887 }
 888
 889 Window wxGetWindowParent(Window window)
 890 {
 891     wxASSERT_MSG( window, "invalid window" );
 892
 893     return (Window) 0;
 894
 895     Window parent, root = 0;
 896 #if wxUSE_NANOX
 897     int noChildren = 0;
 898 #else
 899     unsigned int noChildren = 0;
 900 #endif
 901     Window* children = NULL;
 902
 903     // #define XQueryTree(d,w,r,p,c,nc)         GrQueryTree(w,p,c,nc)
 904     int res = 1;
 905 #if !wxUSE_NANOX
 906     res =
 907 #endif
 908         XQueryTree((Display*) wxGetDisplay(), window, & root, & parent,
 909                          & children, & noChildren);
 910     if (children)
 911         XFree(children);
 912     if (res)
 913         return parent;
 914     else
 915         return (Window) 0;
 916 }
 917
 918 void wxExit()
 919 {
 920     int retValue = 0;
 921     if (wxTheApp)
 922         retValue = wxTheApp->OnExit();
 923
 924     wxApp::CleanUp();
 925     /*
 926     * Exit in some platform-specific way. Not recommended that the app calls this:
 927     * only for emergencies.
 928     */
 929     exit(retValue);
 930 }
 931
 932 // Yield to other processes
 933
 934 bool wxApp::Yield(bool onlyIfNeeded)
 935 {
 936     bool s_inYield = FALSE;
 937
 938     if ( s_inYield )
 939     {
 940         if ( !onlyIfNeeded )
 941         {
 942             wxFAIL_MSG( wxT("wxYield called recursively" ) );
 943         }
 944
 945         return FALSE;
 946     }
 947
 948     s_inYield = TRUE;
 949
 950     while (wxTheApp && wxTheApp->Pending())
 951         wxTheApp->Dispatch();
 952
 953     s_inYield = FALSE;
 954
 955     return TRUE;
 956 }
 957
 958 wxIcon wxApp::GetStdIcon(int which) const
 959 {
 960     return wxTheme::Get()->GetRenderer()->GetStdIcon(which);
 961 }
 962
 963 void wxApp::OnAssert(const wxChar *file, int line, const wxChar *msg)
 964 {
 965     // While the GUI isn't working that well, just print out the
 966     // message.
 967 #if 0
 968     wxAppBase::OnAssert(file, line, msg);
 969 #else
 970     wxString msg2;
 971     msg2.Printf("At file %s:%d: %s", file, line, msg);
 972     wxLogDebug(msg2);
 973 #endif
 974 }
 975