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 #ifdef __VMS__
  41 #pragma message disable nosimpint
  42 #endif
  43 #include <X11/Xlib.h>
  44 #include <X11/Xutil.h>
  45 #include <X11/Xatom.h>
  46
  47 #ifdef __VMS__
  48 #pragma message enable nosimpint
  49 #endif
  50
  51 #include "wx/x11/private.h"
  52
  53 #include <string.h>
  54
  55 extern wxList wxPendingDelete;
  56
  57 wxApp *wxTheApp = NULL;
  58
  59 wxHashTable *wxWidgetHashTable = NULL;
  60
  61 IMPLEMENT_DYNAMIC_CLASS(wxApp, wxEvtHandler)
  62
  63 BEGIN_EVENT_TABLE(wxApp, wxEvtHandler)
  64     EVT_IDLE(wxApp::OnIdle)
  65 END_EVENT_TABLE()
  66
  67 #ifdef __WXDEBUG__
  68 typedef int (*XErrorHandlerFunc)(Display *, XErrorEvent *);
  69
  70 XErrorHandlerFunc gs_pfnXErrorHandler = 0;
  71
  72 static int wxXErrorHandler(Display *dpy, XErrorEvent *xevent)
  73 {
  74     // just forward to the default handler for now
  75     return gs_pfnXErrorHandler(dpy, xevent);
  76 }
  77 #endif // __WXDEBUG__
  78
  79 long wxApp::sm_lastMessageTime = 0;
  80 WXDisplay *wxApp::ms_display = NULL;
  81
  82 // This is set within wxEntryStart -- too early on
  83 // to put these in wxTheApp
  84 static int g_newArgc = 0;
  85 static wxChar** g_newArgv = NULL;
  86 static bool g_showIconic = FALSE;
  87 static wxSize g_initialSize = wxDefaultSize;
  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     wxWidgetHashTable = new wxHashTable(wxKEY_INTEGER);
 110
 111     wxModule::RegisterModules();
 112     if (!wxModule::InitializeModules()) return FALSE;
 113
 114     return TRUE;
 115 }
 116
 117 void wxApp::CleanUp()
 118 {
 119     if (g_newArgv)
 120         delete[] g_newArgv;
 121     g_newArgv = NULL;
 122
 123     delete wxWidgetHashTable;
 124     wxWidgetHashTable = NULL;
 125
 126     wxModule::CleanUpModules();
 127
 128 #if wxUSE_WX_RESOURCES
 129     wxCleanUpResourceSystem();
 130 #endif
 131
 132     delete wxTheColourDatabase;
 133     wxTheColourDatabase = NULL;
 134
 135     wxDeleteStockObjects();
 136
 137     wxDeleteStockLists();
 138
 139     delete wxTheApp;
 140     wxTheApp = NULL;
 141
 142     wxClassInfo::CleanUpClasses();
 143
 144 #if wxUSE_THREADS
 145     delete wxPendingEvents;
 146     delete wxPendingEventsLocker;
 147 #endif
 148
 149 #if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
 150     // At this point we want to check if there are any memory
 151     // blocks that aren't part of the wxDebugContext itself,
 152     // as a special case. Then when dumping we need to ignore
 153     // wxDebugContext, too.
 154     if (wxDebugContext::CountObjectsLeft(TRUE) > 0)
 155     {
 156         wxLogDebug("There were memory leaks.");
 157         wxDebugContext::Dump();
 158         wxDebugContext::PrintStatistics();
 159     }
 160 #endif
 161
 162     // do it as the very last thing because everything else can log messages
 163     wxLog::DontCreateOnDemand();
 164     // do it as the very last thing because everything else can log messages
 165     delete wxLog::SetActiveTarget(NULL);
 166 }
 167
 168 // NB: argc and argv may be changed here, pass by reference!
 169 int wxEntryStart( int& argc, char *argv[] )
 170 {
 171 #ifdef __WXDEBUG__
 172     // install the X error handler
 173     gs_pfnXErrorHandler = XSetErrorHandler( wxXErrorHandler );
 174 #endif // __WXDEBUG__
 175
 176     wxString displayName;
 177     bool syncDisplay = FALSE;
 178
 179     // Parse the arguments.
 180     // We can't use wxCmdLineParser or OnInitCmdLine and friends because
 181     // we have to create the Display earlier. If we can find a way to
 182     // use the wxAppBase API then I'll be quite happy to change it.
 183     g_newArgv = new wxChar*[argc];
 184     g_newArgc = 0;
 185     int i;
 186     for (i = 0; i < argc; i++)
 187     {
 188         wxString arg(argv[i]);
 189         if (arg == wxT("-display"))
 190         {
 191             if (i < (argc - 1))
 192             {
 193                 i ++;
 194                 displayName = argv[i];
 195                 continue;
 196             }
 197         }
 198         else if (arg == wxT("-geometry"))
 199         {
 200             if (i < (argc - 1))
 201             {
 202                 i ++;
 203                 wxString windowGeometry = argv[i];
 204                 int w, h;
 205                 if (wxSscanf(windowGeometry.c_str(), _T("%dx%d"), &w, &h) != 2)
 206                 {
 207                     wxLogError(_("Invalid geometry specification '%s'"), windowGeometry.c_str());
 208                 }
 209                 else
 210                 {
 211                     g_initialSize = wxSize(w, h);
 212                 }
 213                 continue;
 214             }
 215         }
 216         else if (arg == wxT("-sync"))
 217         {
 218             syncDisplay = TRUE;
 219             continue;
 220         }
 221         else if (arg == wxT("-iconic"))
 222         {
 223             g_showIconic = TRUE;
 224
 225             continue;
 226         }
 227
 228         // Not eaten by wxWindows, so pass through
 229         g_newArgv[g_newArgc] = argv[i];
 230         g_newArgc ++;
 231     }
 232
 233     Display* xdisplay;
 234     if (displayName.IsEmpty())
 235         xdisplay = XOpenDisplay(NULL);
 236     else
 237         xdisplay = XOpenDisplay(displayName);
 238
 239     if (!xdisplay)
 240     {
 241         wxLogError( _("wxWindows could not open display. Exiting.") );
 242         return -1;
 243     }
 244
 245     if (syncDisplay)
 246     {
 247         XSynchronize(xdisplay, True);
 248     }
 249
 250     wxApp::ms_display = (WXDisplay*) xdisplay;
 251
 252     XSelectInput( xdisplay, XDefaultRootWindow(xdisplay), PropertyChangeMask);
 253
 254     wxSetDetectableAutoRepeat( TRUE );
 255
 256     if (!wxApp::Initialize())
 257         return -1;
 258
 259     return 0;
 260 }
 261
 262 int wxEntryInitGui()
 263 {
 264     int retValue = 0;
 265
 266     if ( !wxTheApp->OnInitGui() )
 267         retValue = -1;
 268
 269     return retValue;
 270 }
 271
 272
 273 int wxEntry( int argc, char *argv[] )
 274 {
 275 #if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
 276     // This seems to be necessary since there are 'rogue'
 277     // objects present at this point (perhaps global objects?)
 278     // Setting a checkpoint will ignore them as far as the
 279     // memory checking facility is concerned.
 280     // Of course you may argue that memory allocated in globals should be
 281     // checked, but this is a reasonable compromise.
 282     wxDebugContext::SetCheckpoint();
 283 #endif
 284     int err = wxEntryStart(argc, argv);
 285     if (err)
 286         return err;
 287
 288     if (!wxTheApp)
 289     {
 290         if (!wxApp::GetInitializerFunction())
 291         {
 292             printf( "wxWindows error: No initializer - use IMPLEMENT_APP macro.\n" );
 293             return 0;
 294         };
 295
 296         wxTheApp = (wxApp*) (* wxApp::GetInitializerFunction()) ();
 297     };
 298
 299     if (!wxTheApp)
 300     {
 301         printf( "wxWindows error: wxTheApp == NULL\n" );
 302         return 0;
 303     };
 304
 305     wxTheApp->SetClassName(wxFileNameFromPath(argv[0]));
 306     wxTheApp->SetAppName(wxFileNameFromPath(argv[0]));
 307
 308     // The command line may have been changed
 309     // by stripping out -display etc.
 310     if (g_newArgc > 0)
 311     {
 312         wxTheApp->argc = g_newArgc;
 313         wxTheApp->argv = g_newArgv;
 314     }
 315     else
 316     {
 317         wxTheApp->argc = argc;
 318         wxTheApp->argv = argv;
 319     }
 320     wxTheApp->m_showIconic = g_showIconic;
 321     wxTheApp->m_initialSize = g_initialSize;
 322
 323     int retValue;
 324     retValue = wxEntryInitGui();
 325
 326     // Here frames insert themselves automatically into wxTopLevelWindows by
 327     // getting created in OnInit().
 328     if ( retValue == 0 )
 329     {
 330         if ( !wxTheApp->OnInit() )
 331             retValue = -1;
 332     }
 333
 334     if ( retValue == 0 )
 335     {
 336         if (wxTheApp->Initialized()) retValue = wxTheApp->OnRun();
 337     }
 338
 339     // flush the logged messages if any
 340     wxLog *pLog = wxLog::GetActiveTarget();
 341     if ( pLog != NULL && pLog->HasPendingMessages() )
 342         pLog->Flush();
 343
 344     delete wxLog::SetActiveTarget(new wxLogStderr); // So dialog boxes aren't used
 345     // for further messages
 346
 347     if (wxTheApp->GetTopWindow())
 348     {
 349         delete wxTheApp->GetTopWindow();
 350         wxTheApp->SetTopWindow(NULL);
 351     }
 352
 353     wxTheApp->DeletePendingObjects();
 354
 355     wxTheApp->OnExit();
 356
 357     wxApp::CleanUp();
 358
 359     return retValue;
 360 };
 361
 362 // Static member initialization
 363 wxAppInitializerFunction wxAppBase::m_appInitFn = (wxAppInitializerFunction) NULL;
 364
 365 wxApp::wxApp()
 366 {
 367     m_topWindow = NULL;
 368     wxTheApp = this;
 369     m_className = "";
 370     m_wantDebugOutput = TRUE ;
 371     m_appName = "";
 372     argc = 0;
 373     argv = NULL;
 374     m_exitOnFrameDelete = TRUE;
 375     m_mainColormap = (WXColormap) NULL;
 376     m_topLevelWidget = (WXWindow) NULL;
 377     m_maxRequestSize = 0;
 378     m_mainLoop = NULL;
 379     m_showIconic = FALSE;
 380     m_initialSize = wxDefaultSize;
 381 }
 382
 383 bool wxApp::Initialized()
 384 {
 385     if (GetTopWindow())
 386         return TRUE;
 387     else
 388         return FALSE;
 389 }
 390
 391 int wxApp::MainLoop()
 392 {
 393      int rt;
 394     m_mainLoop = new wxEventLoop;
 395
 396     rt = m_mainLoop->Run();
 397
 398     delete m_mainLoop;
 399     m_mainLoop = NULL;
 400     return rt;
 401 }
 402
 403 // Processes an X event.
 404 void wxApp::ProcessXEvent(WXEvent* _event)
 405 {
 406     XEvent* event = (XEvent*) _event;
 407
 408     wxWindow* win = NULL;
 409     Window window = event->xany.window;
 410     Window actualWindow = window;
 411
 412     // Find the first wxWindow that corresponds to this event window
 413     // Because we're receiving events after a window
 414     // has been destroyed, assume a 1:1 match between
 415     // Window and wxWindow, so if it's not in the table,
 416     // it must have been destroyed.
 417
 418     win = wxGetWindowFromTable(window);
 419     if (!win)
 420             return;
 421
 422     switch (event->type)
 423     {
 424         case KeyPress:
 425         {
 426             if (win && !win->IsEnabled())
 427                 return;
 428
 429             {
 430                 if (win)
 431                 {
 432                     wxKeyEvent keyEvent(wxEVT_KEY_DOWN);
 433                     wxTranslateKeyEvent(keyEvent, win, window, event);
 434
 435                     wxLogDebug( "OnKey from %s", win->GetName().c_str() );
 436
 437                     // We didn't process wxEVT_KEY_DOWN, so send
 438                     // wxEVT_CHAR
 439                     if (!win->GetEventHandler()->ProcessEvent( keyEvent ))
 440                     {
 441                         keyEvent.SetEventType(wxEVT_CHAR);
 442                         win->GetEventHandler()->ProcessEvent( keyEvent );
 443                     }
 444
 445                     // We intercepted and processed the key down event
 446                     return;
 447                 }
 448             }
 449             return;
 450         }
 451         case KeyRelease:
 452         {
 453             if (win && !win->IsEnabled())
 454                 return;
 455
 456             if (win)
 457             {
 458                 wxKeyEvent keyEvent(wxEVT_KEY_UP);
 459                 wxTranslateKeyEvent(keyEvent, win, window, event);
 460
 461                 win->GetEventHandler()->ProcessEvent( keyEvent );
 462             }
 463             return;
 464         }
 465         case ConfigureNotify:
 466         {
 467             // Not clear if this is the same in NanoX
 468             if (win)
 469             {
 470                 wxSizeEvent sizeEvent( wxSize(event->xconfigure.width,event->xconfigure.height), win->GetId() );
 471                 sizeEvent.SetEventObject( win );
 472
 473                 win->GetEventHandler()->ProcessEvent( sizeEvent );
 474             }
 475         }
 476 #if !wxUSE_NANOX
 477         case PropertyNotify:
 478         {
 479             HandlePropertyChange(_event);
 480             return;
 481         }
 482         case ClientMessage:
 483         {
 484             if (win && !win->IsEnabled())
 485                 return;
 486
 487             Atom wm_delete_window = XInternAtom(wxGlobalDisplay(), "WM_DELETE_WINDOW", True);
 488             Atom wm_protocols = XInternAtom(wxGlobalDisplay(), "WM_PROTOCOLS", True);
 489
 490             if (event->xclient.message_type == wm_protocols)
 491             {
 492                 if ((Atom) (event->xclient.data.l[0]) == wm_delete_window)
 493                 {
 494                     if (win)
 495                     {
 496                         win->Close(FALSE);
 497                     }
 498                 }
 499             }
 500             return;
 501         }
 502         case ResizeRequest:
 503         {
 504             /*
 505             * If resize event, don't resize until the last resize event for this
 506             * window is recieved. Prevents flicker as windows are resized.
 507             */
 508
 509             Display *disp = (Display*) wxGetDisplay();
 510             XEvent report;
 511
 512             //  to avoid flicker
 513             report = * event;
 514             while( XCheckTypedWindowEvent (disp, actualWindow, ResizeRequest, &report));
 515
 516             if (win)
 517             {
 518                 wxSize sz = win->GetSize();
 519                 wxSizeEvent sizeEvent(sz, win->GetId());
 520                 sizeEvent.SetEventObject(win);
 521
 522                 win->GetEventHandler()->ProcessEvent( sizeEvent );
 523             }
 524
 525             return;
 526         }
 527 #endif
 528 #if wxUSE_NANOX
 529         case GR_EVENT_TYPE_CLOSE_REQ:
 530         {
 531             if (win)
 532             {
 533                 win->Close(FALSE);
 534             }
 535             break;
 536         }
 537 #endif
 538         case Expose:
 539         {
 540             if (win)
 541             {
 542                 win->GetUpdateRegion().Union( event->xexpose.x, event->xexpose.y,
 543                                               event->xexpose.width, event->xexpose.height);
 544
 545                 win->GetClearRegion().Union( event->xexpose.x, event->xexpose.y,
 546                                              event->xexpose.width, event->xexpose.height);
 547
 548                 if (event->xexpose.count == 0)
 549                 {
 550                     // Only erase background, paint in idle time.
 551                     win->SendEraseEvents();
 552                 }
 553             }
 554
 555             return;
 556         }
 557         case GraphicsExpose:
 558         {
 559             if (win)
 560             {
 561                 // wxLogDebug( "GraphicsExpose from %s", win->GetName().c_str(),
 562                 //                              event->xgraphicsexpose.x, event->xgraphicsexpose.y,
 563                 //                              event->xgraphicsexpose.width, event->xgraphicsexpose.height);
 564
 565                 win->GetUpdateRegion().Union( event->xgraphicsexpose.x, event->xgraphicsexpose.y,
 566                                               event->xgraphicsexpose.width, event->xgraphicsexpose.height);
 567
 568                 win->GetClearRegion().Union( event->xgraphicsexpose.x, event->xgraphicsexpose.y,
 569                                              event->xgraphicsexpose.width, event->xgraphicsexpose.height);
 570
 571                 if (event->xgraphicsexpose.count == 0)
 572                 {
 573                     // Only erase background, paint in idle time.
 574                     win->SendEraseEvents();
 575                 }
 576             }
 577
 578             return;
 579         }
 580         case EnterNotify:
 581         case LeaveNotify:
 582         case ButtonPress:
 583         case ButtonRelease:
 584         case MotionNotify:
 585         {
 586             if (!win)
 587                 return;
 588
 589             if (!win->IsEnabled())
 590                 return;
 591
 592 #if 1
 593             if (event->type == ButtonPress)
 594             {
 595                 if ((win != wxWindow::FindFocus()) && win->AcceptsFocus())
 596                    win->SetFocus();
 597             }
 598 #endif
 599
 600             wxMouseEvent wxevent;
 601             wxTranslateMouseEvent(wxevent, win, window, event);
 602             win->GetEventHandler()->ProcessEvent( wxevent );
 603             return;
 604         }
 605         case FocusIn:
 606             {
 607 #if !wxUSE_NANOX
 608                 if (win && event->xfocus.detail != NotifyPointer)
 609 #endif
 610                 {
 611                     wxLogDebug( "FocusIn from %s", win->GetName().c_str() );
 612
 613                     wxFocusEvent focusEvent(wxEVT_SET_FOCUS, win->GetId());
 614                     focusEvent.SetEventObject(win);
 615                     win->GetEventHandler()->ProcessEvent(focusEvent);
 616                 }
 617                 break;
 618             }
 619         case FocusOut:
 620             {
 621 #if !wxUSE_NANOX
 622                 if (win && event->xfocus.detail != NotifyPointer)
 623 #endif
 624                 {
 625                     wxLogDebug( "FocusOut from %s", win->GetName().c_str() );
 626
 627                     wxFocusEvent focusEvent(wxEVT_KILL_FOCUS, win->GetId());
 628                     focusEvent.SetEventObject(win);
 629                     win->GetEventHandler()->ProcessEvent(focusEvent);
 630                 }
 631                 break;
 632             }
 633         case DestroyNotify:
 634             {
 635                 // Do we want to process this (for top-level windows)?
 636                 // But we want to be able to veto closes, anyway
 637                 break;
 638             }
 639         default:
 640         {
 641 #ifdef __WXDEBUG__
 642             //wxString eventName = wxGetXEventName(XEvent& event);
 643             //wxLogDebug(wxT("Event %s not handled"), eventName.c_str());
 644 #endif
 645             break;
 646         }
 647     }
 648 }
 649
 650 // Returns TRUE if more time is needed.
 651 // Note that this duplicates wxEventLoopImpl::SendIdleEvent
 652 // but ProcessIdle may be needed by apps, so is kept.
 653 bool wxApp::ProcessIdle()
 654 {
 655     wxIdleEvent event;
 656     event.SetEventObject(this);
 657     ProcessEvent(event);
 658
 659     return event.MoreRequested();
 660 }
 661
 662 void wxApp::ExitMainLoop()
 663 {
 664     if (m_mainLoop)
 665         m_mainLoop->Exit(0);
 666 }
 667
 668 // Is a message/event pending?
 669 bool wxApp::Pending()
 670 {
 671     return wxEventLoop::GetActive()->Pending();
 672 }
 673
 674 // Dispatch a message.
 675 void wxApp::Dispatch()
 676 {
 677     wxEventLoop::GetActive()->Dispatch();
 678 }
 679
 680 // This should be redefined in a derived class for
 681 // handling property change events for XAtom IPC.
 682 void wxApp::HandlePropertyChange(WXEvent *event)
 683 {
 684     // by default do nothing special
 685     // TODO: what to do for X11
 686     // XtDispatchEvent((XEvent*) event);
 687 }
 688
 689 void wxApp::OnIdle(wxIdleEvent& event)
 690 {
 691     static bool s_inOnIdle = FALSE;
 692
 693     // Avoid recursion (via ProcessEvent default case)
 694     if (s_inOnIdle)
 695         return;
 696
 697     s_inOnIdle = TRUE;
 698
 699     // Resend in the main thread events which have been prepared in other
 700     // threads
 701     ProcessPendingEvents();
 702
 703     // 'Garbage' collection of windows deleted with Close()
 704     DeletePendingObjects();
 705
 706     // Send OnIdle events to all windows
 707     bool needMore = SendIdleEvents();
 708
 709     if (needMore)
 710         event.RequestMore(TRUE);
 711
 712     s_inOnIdle = FALSE;
 713 }
 714
 715 void wxWakeUpIdle()
 716 {
 717     // **** please implement me! ****
 718     // Wake up the idle handler processor, even if it is in another thread...
 719 }
 720
 721
 722 // Send idle event to all top-level windows
 723 bool wxApp::SendIdleEvents()
 724 {
 725     bool needMore = FALSE;
 726
 727     wxWindowList::Node* node = wxTopLevelWindows.GetFirst();
 728     while (node)
 729     {
 730         wxWindow* win = node->GetData();
 731         if (SendIdleEvents(win))
 732             needMore = TRUE;
 733         node = node->GetNext();
 734     }
 735
 736     return needMore;
 737 }
 738
 739 // Send idle event to window and all subwindows
 740 bool wxApp::SendIdleEvents(wxWindow* win)
 741 {
 742     bool needMore = FALSE;
 743
 744     wxIdleEvent event;
 745     event.SetEventObject(win);
 746
 747     win->GetEventHandler()->ProcessEvent(event);
 748
 749     win->OnInternalIdle();
 750
 751     if (event.MoreRequested())
 752         needMore = TRUE;
 753
 754     wxNode* node = win->GetChildren().First();
 755     while (node)
 756     {
 757         wxWindow* win = (wxWindow*) node->Data();
 758         if (SendIdleEvents(win))
 759             needMore = TRUE;
 760
 761         node = node->Next();
 762     }
 763
 764     return needMore;
 765 }
 766
 767 void wxApp::DeletePendingObjects()
 768 {
 769     wxNode *node = wxPendingDelete.First();
 770     while (node)
 771     {
 772         wxObject *obj = (wxObject *)node->Data();
 773
 774         delete obj;
 775
 776         if (wxPendingDelete.Member(obj))
 777             delete node;
 778
 779         // Deleting one object may have deleted other pending
 780         // objects, so start from beginning of list again.
 781         node = wxPendingDelete.First();
 782     }
 783 }
 784
 785 // Create display, and other initialization
 786 bool wxApp::OnInitGui()
 787 {
 788     // Eventually this line will be removed, but for
 789     // now we don't want to try popping up a dialog
 790     // for error messages.
 791     delete wxLog::SetActiveTarget(new wxLogStderr);
 792
 793     if (!wxAppBase::OnInitGui())
 794         return FALSE;
 795
 796     GetMainColormap( wxApp::GetDisplay() );
 797
 798     m_maxRequestSize = XMaxRequestSize( (Display*) wxApp::GetDisplay() );
 799
 800     return TRUE;
 801 }
 802
 803 WXColormap wxApp::GetMainColormap(WXDisplay* display)
 804 {
 805     if (!display) /* Must be called first with non-NULL display */
 806         return m_mainColormap;
 807
 808     int defaultScreen = DefaultScreen((Display*) display);
 809     Screen* screen = XScreenOfDisplay((Display*) display, defaultScreen);
 810
 811     Colormap c = DefaultColormapOfScreen(screen);
 812
 813     if (!m_mainColormap)
 814         m_mainColormap = (WXColormap) c;
 815
 816     return (WXColormap) c;
 817 }
 818
 819 Window wxGetWindowParent(Window window)
 820 {
 821     wxASSERT_MSG( window, "invalid window" );
 822
 823     return (Window) 0;
 824
 825     Window parent, root = 0;
 826     unsigned int noChildren = 0;
 827     Window* children = NULL;
 828     int res = XQueryTree((Display*) wxGetDisplay(), window, & root, & parent,
 829                          & children, & noChildren);
 830     if (children)
 831         XFree(children);
 832     if (res)
 833         return parent;
 834     else
 835         return (Window) 0;
 836 }
 837
 838 void wxExit()
 839 {
 840     int retValue = 0;
 841     if (wxTheApp)
 842         retValue = wxTheApp->OnExit();
 843
 844     wxApp::CleanUp();
 845     /*
 846     * Exit in some platform-specific way. Not recommended that the app calls this:
 847     * only for emergencies.
 848     */
 849     exit(retValue);
 850 }
 851
 852 // Yield to other processes
 853
 854 bool wxApp::Yield(bool onlyIfNeeded)
 855 {
 856     bool s_inYield = FALSE;
 857
 858     if ( s_inYield )
 859     {
 860         if ( !onlyIfNeeded )
 861         {
 862             wxFAIL_MSG( wxT("wxYield called recursively" ) );
 863         }
 864
 865         return FALSE;
 866     }
 867
 868     s_inYield = TRUE;
 869
 870     while (wxTheApp && wxTheApp->Pending())
 871         wxTheApp->Dispatch();
 872
 873     s_inYield = FALSE;
 874
 875     return TRUE;
 876 }
 877
 878 wxIcon wxApp::GetStdIcon(int which) const
 879 {
 880     return wxTheme::Get()->GetRenderer()->GetStdIcon(which);
 881 }
 882
 883 void wxApp::OnAssert(const wxChar *file, int line, const wxChar *msg)
 884 {
 885     // While the GUI isn't working that well, just print out the
 886     // message.
 887 #if 0
 888     wxAppBase::OnAssert(file, line, msg);
 889 #else
 890     wxString msg2;
 891     msg2.Printf("At file %s:%d: %s", file, line, msg);
 892     wxLogDebug(msg2);
 893 #endif
 894 }
 895