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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  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 #include "wx/timer.h"
  29 #include "wx/filename.h"
  30 #include "wx/hash.h"
  31
  32 #include "wx/univ/theme.h"
  33 #include "wx/univ/renderer.h"
  34
  35 #if wxUSE_THREADS
  36     #include "wx/thread.h"
  37 #endif
  38
  39 #include "wx/x11/private.h"
  40
  41 #include <string.h>
  42
  43 //------------------------------------------------------------------------
  44 //   global data
  45 //------------------------------------------------------------------------
  46
  47 extern wxList wxPendingDelete;
  48
  49 wxWindowHash *wxWidgetHashTable = NULL;
  50 wxWindowHash *wxClientWidgetHashTable = NULL;
  51
  52 static bool g_showIconic = FALSE;
  53 static wxSize g_initialSize = wxDefaultSize;
  54
  55 // This is required for wxFocusEvent::SetWindow(). It will only
  56 // work for focus events which we provoke ourselves (by calling
  57 // SetFocus()). It will not work for those events, which X11
  58 // generates itself.
  59 static wxWindow *g_nextFocus = NULL;
  60 static wxWindow *g_prevFocus = NULL;
  61
  62 //------------------------------------------------------------------------
  63 //   X11 error handling
  64 //------------------------------------------------------------------------
  65
  66 #ifdef __WXDEBUG__
  67 typedef int (*XErrorHandlerFunc)(Display *, XErrorEvent *);
  68
  69 XErrorHandlerFunc gs_pfnXErrorHandler = 0;
  70
  71 static int wxXErrorHandler(Display *dpy, XErrorEvent *xevent)
  72 {
  73     // just forward to the default handler for now
  74     if (gs_pfnXErrorHandler)
  75         return gs_pfnXErrorHandler(dpy, xevent);
  76     else
  77         return 0;
  78 }
  79 #endif // __WXDEBUG__
  80
  81 //------------------------------------------------------------------------
  82 //   wxApp
  83 //------------------------------------------------------------------------
  84
  85 long wxApp::sm_lastMessageTime = 0;
  86 WXDisplay *wxApp::ms_display = NULL;
  87
  88 IMPLEMENT_DYNAMIC_CLASS(wxApp, wxEvtHandler)
  89
  90 BEGIN_EVENT_TABLE(wxApp, wxEvtHandler)
  91     EVT_IDLE(wxAppBase::OnIdle)
  92 END_EVENT_TABLE()
  93
  94 bool wxApp::Initialize(int& argc, wxChar **argv)
  95 {
  96 #if defined(__WXDEBUG__) && !wxUSE_NANOX
  97     // install the X error handler
  98     gs_pfnXErrorHandler = XSetErrorHandler( wxXErrorHandler );
  99 #endif // __WXDEBUG__
 100
 101     wxString displayName;
 102     bool syncDisplay = FALSE;
 103
 104     int argcOrig = argc;
 105     for ( int i = 0; i < argcOrig; i++ )
 106     {
 107         if (wxStrcmp( argv[i], _T("-display") ) == 0)
 108         {
 109             if (i < (argc - 1))
 110             {
 111                 argv[i++] = NULL;
 112
 113                 displayName = argv[i];
 114
 115                 argv[i] = NULL;
 116                 argc -= 2;
 117             }
 118         }
 119         else if (wxStrcmp( argv[i], _T("-geometry") ) == 0)
 120         {
 121             if (i < (argc - 1))
 122             {
 123                 argv[i++] = NULL;
 124
 125                 int w, h;
 126                 if (wxSscanf(argv[i], _T("%dx%d"), &w, &h) != 2)
 127                 {
 128                     wxLogError( _("Invalid geometry specification '%s'"),
 129                                 wxString(argv[i]).c_str() );
 130                 }
 131                 else
 132                 {
 133                     g_initialSize = wxSize(w, h);
 134                 }
 135
 136                 argv[i] = NULL;
 137                 argc -= 2;
 138             }
 139         }
 140         else if (wxStrcmp( argv[i], _T("-sync") ) == 0)
 141         {
 142             syncDisplay = TRUE;
 143
 144             argv[i] = NULL;
 145             argc--;
 146         }
 147         else if (wxStrcmp( argv[i], _T("-iconic") ) == 0)
 148         {
 149             g_showIconic = TRUE;
 150
 151             argv[i] = NULL;
 152             argc--;
 153         }
 154     }
 155
 156     if ( argc != argcOrig )
 157     {
 158         // remove the argumens we consumed
 159         for ( int i = 0; i < argc; i++ )
 160         {
 161             while ( !argv[i] )
 162             {
 163                 memmove(argv + i, argv + i + 1, argcOrig - i);
 164             }
 165         }
 166     }
 167
 168     // X11 display stuff
 169     Display *xdisplay;
 170     if ( displayName.empty() )
 171         xdisplay = XOpenDisplay( NULL );
 172     else
 173         xdisplay = XOpenDisplay( displayName.ToAscii() );
 174     if (!xdisplay)
 175     {
 176         wxLogError( _("wxWidgets could not open display. Exiting.") );
 177         return false;
 178     }
 179
 180     if (syncDisplay)
 181         XSynchronize(xdisplay, True);
 182
 183     ms_display = (WXDisplay*) xdisplay;
 184
 185     XSelectInput( xdisplay, XDefaultRootWindow(xdisplay), PropertyChangeMask);
 186
 187     // Misc.
 188     wxSetDetectableAutoRepeat( TRUE );
 189
 190     if ( !wxAppBase::Initialize(argc, argv) )
 191     {
 192         XCloseDisplay(xdisplay);
 193
 194         return false;
 195     }
 196
 197 #if wxUSE_UNICODE
 198     // Glib's type system required by Pango
 199     g_type_init();
 200 #endif
 201
 202 #if wxUSE_INTL
 203     wxFont::SetDefaultEncoding(wxLocale::GetSystemEncoding());
 204 #endif
 205
 206     wxWidgetHashTable = new wxWindowHash;
 207     wxClientWidgetHashTable = new wxWindowHash;
 208
 209     return true;
 210 }
 211
 212 void wxApp::CleanUp()
 213 {
 214     delete wxWidgetHashTable;
 215     wxWidgetHashTable = NULL;
 216     delete wxClientWidgetHashTable;
 217     wxClientWidgetHashTable = NULL;
 218
 219     wxAppBase::CleanUp();
 220 }
 221
 222 wxApp::wxApp()
 223 {
 224     // TODO: parse the command line
 225     argc = 0;
 226     argv = NULL;
 227
 228     m_mainColormap = (WXColormap) NULL;
 229     m_topLevelWidget = (WXWindow) NULL;
 230     m_maxRequestSize = 0;
 231     m_showIconic = FALSE;
 232     m_initialSize = wxDefaultSize;
 233
 234 #if !wxUSE_NANOX
 235     m_visualInfo = NULL;
 236 #endif
 237 }
 238
 239 wxApp::~wxApp()
 240 {
 241 #if !wxUSE_NANOX
 242     delete m_visualInfo;
 243 #endif
 244 }
 245
 246 #if !wxUSE_NANOX
 247 //-----------------------------------------------------------------------
 248 // X11 predicate function for exposure compression
 249 //-----------------------------------------------------------------------
 250
 251 struct wxExposeInfo
 252 {
 253     Window window;
 254     Bool found_non_matching;
 255 };
 256
 257 static Bool expose_predicate (Display *display, XEvent *xevent, XPointer arg)
 258 {
 259     wxExposeInfo *info = (wxExposeInfo*) arg;
 260
 261     if (info->found_non_matching)
 262        return FALSE;
 263
 264     if (xevent->xany.type != Expose)
 265     {
 266         info->found_non_matching = TRUE;
 267         return FALSE;
 268     }
 269
 270     if (xevent->xexpose.window != info->window)
 271     {
 272         info->found_non_matching = TRUE;
 273         return FALSE;
 274     }
 275
 276     return TRUE;
 277 }
 278 #endif
 279     // wxUSE_NANOX
 280
 281 //-----------------------------------------------------------------------
 282 // Processes an X event, returning TRUE if the event was processed.
 283 //-----------------------------------------------------------------------
 284
 285 bool wxApp::ProcessXEvent(WXEvent* _event)
 286 {
 287     XEvent* event = (XEvent*) _event;
 288
 289     wxWindow* win = NULL;
 290     Window window = XEventGetWindow(event);
 291 #if 0
 292     Window actualWindow = window;
 293 #endif
 294
 295     // Find the first wxWindow that corresponds to this event window
 296     // Because we're receiving events after a window
 297     // has been destroyed, assume a 1:1 match between
 298     // Window and wxWindow, so if it's not in the table,
 299     // it must have been destroyed.
 300
 301     win = wxGetWindowFromTable(window);
 302     if (!win)
 303     {
 304 #if wxUSE_TWO_WINDOWS
 305         win = wxGetClientWindowFromTable(window);
 306         if (!win)
 307 #endif
 308             return FALSE;
 309     }
 310
 311 #ifdef __WXDEBUG__
 312     wxString windowClass = win->GetClassInfo()->GetClassName();
 313 #endif
 314
 315     switch (event->type)
 316     {
 317         case Expose:
 318         {
 319 #if wxUSE_TWO_WINDOWS && !wxUSE_NANOX
 320             if (event->xexpose.window != (Window)win->GetClientAreaWindow())
 321             {
 322                 XEvent tmp_event;
 323                 wxExposeInfo info;
 324                 info.window = event->xexpose.window;
 325                 info.found_non_matching = FALSE;
 326                 while (XCheckIfEvent( wxGlobalDisplay(), &tmp_event, expose_predicate, (XPointer) &info ))
 327                 {
 328                     // Don't worry about optimizing redrawing the border etc.
 329                 }
 330                 win->NeedUpdateNcAreaInIdle();
 331             }
 332             else
 333 #endif
 334             {
 335                 win->GetUpdateRegion().Union( XExposeEventGetX(event), XExposeEventGetY(event),
 336                                               XExposeEventGetWidth(event), XExposeEventGetHeight(event));
 337                 win->GetClearRegion().Union( XExposeEventGetX(event), XExposeEventGetY(event),
 338                                          XExposeEventGetWidth(event), XExposeEventGetHeight(event));
 339
 340 #if !wxUSE_NANOX
 341                 XEvent tmp_event;
 342                 wxExposeInfo info;
 343                 info.window = event->xexpose.window;
 344                 info.found_non_matching = FALSE;
 345                 while (XCheckIfEvent( wxGlobalDisplay(), &tmp_event, expose_predicate, (XPointer) &info ))
 346                 {
 347                     win->GetUpdateRegion().Union( tmp_event.xexpose.x, tmp_event.xexpose.y,
 348                                                   tmp_event.xexpose.width, tmp_event.xexpose.height );
 349
 350                     win->GetClearRegion().Union( tmp_event.xexpose.x, tmp_event.xexpose.y,
 351                                                  tmp_event.xexpose.width, tmp_event.xexpose.height );
 352                 }
 353 #endif
 354
 355                 // This simplifies the expose and clear areas to simple
 356                 // rectangles.
 357                 win->GetUpdateRegion() = win->GetUpdateRegion().GetBox();
 358                 win->GetClearRegion() = win->GetClearRegion().GetBox();
 359
 360                 // If we only have one X11 window, always indicate
 361                 // that borders might have to be redrawn.
 362                 if (win->GetMainWindow() == win->GetClientAreaWindow())
 363                     win->NeedUpdateNcAreaInIdle();
 364
 365                 // Only erase background, paint in idle time.
 366                 win->SendEraseEvents();
 367
 368                 // EXPERIMENT
 369                 //win->Update();
 370             }
 371
 372             return TRUE;
 373         }
 374
 375 #if !wxUSE_NANOX
 376         case GraphicsExpose:
 377         {
 378             wxLogTrace( _T("expose"), _T("GraphicsExpose from %s"), win->GetName().c_str());
 379
 380             win->GetUpdateRegion().Union( event->xgraphicsexpose.x, event->xgraphicsexpose.y,
 381                                           event->xgraphicsexpose.width, event->xgraphicsexpose.height);
 382
 383             win->GetClearRegion().Union( event->xgraphicsexpose.x, event->xgraphicsexpose.y,
 384                                          event->xgraphicsexpose.width, event->xgraphicsexpose.height);
 385
 386             if (event->xgraphicsexpose.count == 0)
 387             {
 388                 // Only erase background, paint in idle time.
 389                 win->SendEraseEvents();
 390                 // win->Update();
 391             }
 392
 393             return TRUE;
 394         }
 395 #endif
 396
 397         case KeyPress:
 398         {
 399             if (!win->IsEnabled())
 400                 return FALSE;
 401
 402             wxKeyEvent keyEvent(wxEVT_KEY_DOWN);
 403             wxTranslateKeyEvent(keyEvent, win, window, event);
 404
 405             // wxLogDebug( "OnKey from %s", win->GetName().c_str() );
 406
 407             // We didn't process wxEVT_KEY_DOWN, so send wxEVT_CHAR
 408             if (win->GetEventHandler()->ProcessEvent( keyEvent ))
 409                 return TRUE;
 410
 411             keyEvent.SetEventType(wxEVT_CHAR);
 412             // Do the translation again, retaining the ASCII
 413             // code.
 414             wxTranslateKeyEvent(keyEvent, win, window, event, TRUE);
 415             if (win->GetEventHandler()->ProcessEvent( keyEvent ))
 416                 return TRUE;
 417
 418             if ( (keyEvent.m_keyCode == WXK_TAB) &&
 419                  win->GetParent() && (win->GetParent()->HasFlag( wxTAB_TRAVERSAL)) )
 420             {
 421                 wxNavigationKeyEvent new_event;
 422                 new_event.SetEventObject( win->GetParent() );
 423                 /* GDK reports GDK_ISO_Left_Tab for SHIFT-TAB */
 424                 new_event.SetDirection( (keyEvent.m_keyCode == WXK_TAB) );
 425                 /* CTRL-TAB changes the (parent) window, i.e. switch notebook page */
 426                 new_event.SetWindowChange( keyEvent.ControlDown() );
 427                 new_event.SetCurrentFocus( win );
 428                 return win->GetParent()->GetEventHandler()->ProcessEvent( new_event );
 429             }
 430
 431             return FALSE;
 432         }
 433         case KeyRelease:
 434         {
 435             if (!win->IsEnabled())
 436                 return FALSE;
 437
 438             wxKeyEvent keyEvent(wxEVT_KEY_UP);
 439             wxTranslateKeyEvent(keyEvent, win, window, event);
 440
 441             return win->GetEventHandler()->ProcessEvent( keyEvent );
 442         }
 443         case ConfigureNotify:
 444         {
 445 #if wxUSE_NANOX
 446             if (event->update.utype == GR_UPDATE_SIZE)
 447 #endif
 448             {
 449                 wxTopLevelWindow *tlw = wxDynamicCast(win, wxTopLevelWindow);
 450                 if ( tlw )
 451                 {
 452                     tlw->SetConfigureGeometry( XConfigureEventGetX(event), XConfigureEventGetY(event),
 453                         XConfigureEventGetWidth(event), XConfigureEventGetHeight(event) );
 454                 }
 455
 456                 if ( tlw && tlw->IsShown() )
 457                 {
 458                     tlw->SetNeedResizeInIdle();
 459                 }
 460                 else
 461                 {
 462                     wxSizeEvent sizeEvent( wxSize(XConfigureEventGetWidth(event), XConfigureEventGetHeight(event)), win->GetId() );
 463                     sizeEvent.SetEventObject( win );
 464
 465                     return win->GetEventHandler()->ProcessEvent( sizeEvent );
 466                 }
 467             }
 468             return FALSE;
 469         }
 470 #if !wxUSE_NANOX
 471         case PropertyNotify:
 472         {
 473             //wxLogDebug("PropertyNotify: %s", windowClass.c_str());
 474             return HandlePropertyChange(_event);
 475         }
 476         case ClientMessage:
 477         {
 478             if (!win->IsEnabled())
 479                 return FALSE;
 480
 481             Atom wm_delete_window = XInternAtom(wxGlobalDisplay(), "WM_DELETE_WINDOW", True);
 482             Atom wm_protocols = XInternAtom(wxGlobalDisplay(), "WM_PROTOCOLS", True);
 483
 484             if (event->xclient.message_type == wm_protocols)
 485             {
 486                 if ((Atom) (event->xclient.data.l[0]) == wm_delete_window)
 487                 {
 488                     win->Close(FALSE);
 489                     return TRUE;
 490                 }
 491             }
 492             return FALSE;
 493         }
 494 #if 0
 495         case DestroyNotify:
 496         {
 497             printf( "destroy from %s\n", win->GetName().c_str() );
 498             break;
 499         }
 500         case CreateNotify:
 501         {
 502             printf( "create from %s\n", win->GetName().c_str() );
 503             break;
 504         }
 505         case MapRequest:
 506         {
 507             printf( "map request from %s\n", win->GetName().c_str() );
 508             break;
 509         }
 510         case ResizeRequest:
 511         {
 512             printf( "resize request from %s\n", win->GetName().c_str() );
 513
 514             Display *disp = (Display*) wxGetDisplay();
 515             XEvent report;
 516
 517             //  to avoid flicker
 518             report = * event;
 519             while( XCheckTypedWindowEvent (disp, actualWindow, ResizeRequest, &report));
 520
 521             wxSize sz = win->GetSize();
 522             wxSizeEvent sizeEvent(sz, win->GetId());
 523             sizeEvent.SetEventObject(win);
 524
 525             return win->GetEventHandler()->ProcessEvent( sizeEvent );
 526         }
 527 #endif
 528 #endif
 529 #if wxUSE_NANOX
 530         case GR_EVENT_TYPE_CLOSE_REQ:
 531         {
 532             if (win)
 533             {
 534                 win->Close(FALSE);
 535                 return TRUE;
 536             }
 537             return FALSE;
 538             break;
 539         }
 540 #endif
 541         case EnterNotify:
 542         case LeaveNotify:
 543         case ButtonPress:
 544         case ButtonRelease:
 545         case MotionNotify:
 546         {
 547             if (!win->IsEnabled())
 548                 return FALSE;
 549
 550             // Here we check if the top level window is
 551             // disabled, which is one aspect of modality.
 552             wxWindow *tlw = win;
 553             while (tlw && !tlw->IsTopLevel())
 554                 tlw = tlw->GetParent();
 555             if (tlw && !tlw->IsEnabled())
 556                 return FALSE;
 557
 558             if (event->type == ButtonPress)
 559             {
 560                 if ((win != wxWindow::FindFocus()) && win->AcceptsFocus())
 561                 {
 562                     // This might actually be done in wxWindow::SetFocus()
 563                     // and not here. TODO.
 564                     g_prevFocus = wxWindow::FindFocus();
 565                     g_nextFocus = win;
 566
 567                     wxLogTrace( _T("focus"), _T("About to call SetFocus on %s of type %s due to button press"), win->GetName().c_str(), win->GetClassInfo()->GetClassName() );
 568
 569                     // Record the fact that this window is
 570                     // getting the focus, because we'll need to
 571                     // check if its parent is getting a bogus
 572                     // focus and duly ignore it.
 573                     // TODO: may need to have this code in SetFocus, too.
 574                     extern wxWindow* g_GettingFocus;
 575                     g_GettingFocus = win;
 576                     win->SetFocus();
 577                 }
 578             }
 579
 580 #if !wxUSE_NANOX
 581             if (event->type == LeaveNotify || event->type == EnterNotify)
 582             {
 583                 // Throw out NotifyGrab and NotifyUngrab
 584                 if (event->xcrossing.mode != NotifyNormal)
 585                     return FALSE;
 586             }
 587 #endif
 588             wxMouseEvent wxevent;
 589             wxTranslateMouseEvent(wxevent, win, window, event);
 590             return win->GetEventHandler()->ProcessEvent( wxevent );
 591         }
 592         case FocusIn:
 593 #if !wxUSE_NANOX
 594             if ((event->xfocus.detail != NotifyPointer) &&
 595                 (event->xfocus.mode == NotifyNormal))
 596 #endif
 597             {
 598                 wxLogTrace( _T("focus"), _T("FocusIn from %s of type %s"), win->GetName().c_str(), win->GetClassInfo()->GetClassName() );
 599
 600                 extern wxWindow* g_GettingFocus;
 601                 if (g_GettingFocus && g_GettingFocus->GetParent() == win)
 602                 {
 603                     // Ignore this, this can be a spurious FocusIn
 604                     // caused by a child having its focus set.
 605                     g_GettingFocus = NULL;
 606                     wxLogTrace( _T("focus"), _T("FocusIn from %s of type %s being deliberately ignored"), win->GetName().c_str(), win->GetClassInfo()->GetClassName() );
 607                     return TRUE;
 608                 }
 609                 else
 610                 {
 611                     wxFocusEvent focusEvent(wxEVT_SET_FOCUS, win->GetId());
 612                     focusEvent.SetEventObject(win);
 613                     focusEvent.SetWindow( g_prevFocus );
 614                     g_prevFocus = NULL;
 615
 616                     return win->GetEventHandler()->ProcessEvent(focusEvent);
 617                 }
 618             }
 619             return FALSE;
 620
 621         case FocusOut:
 622 #if !wxUSE_NANOX
 623             if ((event->xfocus.detail != NotifyPointer) &&
 624                 (event->xfocus.mode == NotifyNormal))
 625 #endif
 626             {
 627                 wxLogTrace( _T("focus"), _T("FocusOut from %s of type %s"), win->GetName().c_str(), win->GetClassInfo()->GetClassName() );
 628
 629                 wxFocusEvent focusEvent(wxEVT_KILL_FOCUS, win->GetId());
 630                 focusEvent.SetEventObject(win);
 631                 focusEvent.SetWindow( g_nextFocus );
 632                 g_nextFocus = NULL;
 633                 return win->GetEventHandler()->ProcessEvent(focusEvent);
 634             }
 635             return FALSE;
 636
 637 #ifdef __WXDEBUG__
 638         default:
 639             //wxString eventName = wxGetXEventName(XEvent& event);
 640             //wxLogDebug(wxT("Event %s not handled"), eventName.c_str());
 641             break;
 642 #endif // __WXDEBUG__
 643     }
 644
 645     return FALSE;
 646 }
 647
 648 // This should be redefined in a derived class for
 649 // handling property change events for XAtom IPC.
 650 bool wxApp::HandlePropertyChange(WXEvent *event)
 651 {
 652     // by default do nothing special
 653     // TODO: what to do for X11
 654     // XtDispatchEvent((XEvent*) event);
 655     return FALSE;
 656 }
 657
 658 void wxApp::WakeUpIdle()
 659 {
 660     // TODO: use wxMotif implementation?
 661
 662     // Wake up the idle handler processor, even if it is in another thread...
 663 }
 664
 665
 666 // Create display, and other initialization
 667 bool wxApp::OnInitGui()
 668 {
 669     // Eventually this line will be removed, but for
 670     // now we don't want to try popping up a dialog
 671     // for error messages.
 672     delete wxLog::SetActiveTarget(new wxLogStderr);
 673
 674     if (!wxAppBase::OnInitGui())
 675         return FALSE;
 676
 677     GetMainColormap( wxApp::GetDisplay() );
 678
 679     m_maxRequestSize = XMaxRequestSize( (Display*) wxApp::GetDisplay() );
 680
 681 #if !wxUSE_NANOX
 682     m_visualInfo = new wxXVisualInfo;
 683     wxFillXVisualInfo( m_visualInfo, (Display*) wxApp::GetDisplay() );
 684 #endif
 685
 686     return TRUE;
 687 }
 688
 689 #if wxUSE_UNICODE
 690
 691 #include <pango/pango.h>
 692 #include <pango/pangox.h>
 693 #ifdef HAVE_PANGO_XFT
 694     #include <pango/pangoxft.h>
 695 #endif
 696
 697 PangoContext* wxApp::GetPangoContext()
 698 {
 699     static PangoContext *ret = NULL;
 700     if (ret)
 701         return ret;
 702
 703     Display *xdisplay = (Display*) wxApp::GetDisplay();
 704
 705 #ifdef HAVE_PANGO_XFT
 706     int xscreen = DefaultScreen(xdisplay);
 707     static int use_xft = -1;
 708     if (use_xft == -1)
 709     {
 710         wxString val = wxGetenv( L"GDK_USE_XFT" );
 711         use_xft = (val == L"1");
 712     }
 713
 714     if (use_xft)
 715         ret = pango_xft_get_context( xdisplay, xscreen );
 716     else
 717 #endif
 718         ret = pango_x_get_context( xdisplay );
 719
 720     if (!PANGO_IS_CONTEXT(ret))
 721         wxLogError( wxT("No pango context.") );
 722
 723     return ret;
 724 }
 725 #endif
 726
 727 WXColormap wxApp::GetMainColormap(WXDisplay* display)
 728 {
 729     if (!display) /* Must be called first with non-NULL display */
 730         return m_mainColormap;
 731
 732     int defaultScreen = DefaultScreen((Display*) display);
 733     Screen* screen = XScreenOfDisplay((Display*) display, defaultScreen);
 734
 735     Colormap c = DefaultColormapOfScreen(screen);
 736
 737     if (!m_mainColormap)
 738         m_mainColormap = (WXColormap) c;
 739
 740     return (WXColormap) c;
 741 }
 742
 743 Window wxGetWindowParent(Window window)
 744 {
 745     wxASSERT_MSG( window, _T("invalid window") );
 746
 747     return (Window) 0;
 748
 749 #ifndef __VMS
 750    // VMS chokes on unreacheable code
 751    Window parent, root = 0;
 752 #if wxUSE_NANOX
 753     int noChildren = 0;
 754 #else
 755     unsigned int noChildren = 0;
 756 #endif
 757     Window* children = NULL;
 758
 759     // #define XQueryTree(d,w,r,p,c,nc)     GrQueryTree(w,p,c,nc)
 760     int res = 1;
 761 #if !wxUSE_NANOX
 762     res =
 763 #endif
 764         XQueryTree((Display*) wxGetDisplay(), window, & root, & parent,
 765              & children, & noChildren);
 766     if (children)
 767         XFree(children);
 768     if (res)
 769         return parent;
 770     else
 771         return (Window) 0;
 772 #endif
 773 }
 774
 775 void wxApp::Exit()
 776 {
 777     wxApp::CleanUp();
 778
 779     wxAppConsole::Exit();
 780 }
 781
 782 // Yield to other processes
 783
 784 bool wxApp::Yield(bool onlyIfNeeded)
 785 {
 786     // Sometimes only 2 yields seem
 787     // to do the trick, e.g. in the
 788     // progress dialog
 789     int i;
 790     for (i = 0; i < 2; i++)
 791     {
 792         static bool s_inYield = FALSE;
 793
 794         if ( s_inYield )
 795         {
 796             if ( !onlyIfNeeded )
 797             {
 798                 wxFAIL_MSG( wxT("wxYield called recursively" ) );
 799             }
 800
 801             return FALSE;
 802         }
 803
 804         s_inYield = TRUE;
 805
 806         // Make sure we have an event loop object,
 807         // or Pending/Dispatch will fail
 808         wxEventLoop* eventLoop = wxEventLoop::GetActive();
 809         wxEventLoop* newEventLoop = NULL;
 810         if (!eventLoop)
 811         {
 812             newEventLoop = new wxEventLoop;
 813             wxEventLoop::SetActive(newEventLoop);
 814         }
 815
 816         // Call dispatch at least once so that sockets
 817         // can be tested
 818         wxTheApp->Dispatch();
 819
 820         while (wxTheApp && wxTheApp->Pending())
 821             wxTheApp->Dispatch();
 822
 823 #if wxUSE_TIMER
 824         wxTimer::NotifyTimers();
 825 #endif
 826         ProcessIdle();
 827
 828         if (newEventLoop)
 829         {
 830             wxEventLoop::SetActive(NULL);
 831             delete newEventLoop;
 832         }
 833
 834         s_inYield = FALSE;
 835     }
 836
 837     return TRUE;
 838 }
 839
 840 #ifdef __WXDEBUG__
 841
 842 void wxApp::OnAssert(const wxChar *file, int line, const wxChar* cond, const wxChar *msg)
 843 {
 844     // While the GUI isn't working that well, just print out the
 845     // message.
 846 #if 1
 847     wxAppBase::OnAssert(file, line, cond, msg);
 848 #else
 849     wxString msg2;
 850     msg2.Printf("At file %s:%d: %s", file, line, msg);
 851     wxLogDebug(msg2);
 852 #endif
 853 }
 854
 855 #endif // __WXDEBUG__
 856