window.cpp

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            key_code = WXK_ESCAPE;
            break;

        // cursor and other extended keyboard keys
        case GDK_Delete:
            key_code = WXK_DELETE;
            break;

        case GDK_Home:
            key_code = WXK_HOME;
            break;

        case GDK_Left:
            key_code = WXK_LEFT;
            break;

        case GDK_Up:
            key_code = WXK_UP;
            break;

        case GDK_Right:
            key_code = WXK_RIGHT;
            break;

        case GDK_Down:
            key_code = WXK_DOWN;
            break;

        case GDK_Prior:     // == GDK_Page_Up
            key_code = WXK_PRIOR;
            break;

        case GDK_Next:      // == GDK_Page_Down
            key_code = WXK_NEXT;
            break;

        case GDK_End:
            key_code = WXK_END;
            break;

        case GDK_Begin:
            key_code = WXK_HOME;
            break;

        case GDK_Insert:
            key_code = WXK_INSERT;
            break;


        // numpad keys
        case GDK_KP_0:
        case GDK_KP_1:
        case GDK_KP_2:
        case GDK_KP_3:
        case GDK_KP_4:
        case GDK_KP_5:
        case GDK_KP_6:
        case GDK_KP_7:
        case GDK_KP_8:
        case GDK_KP_9:
            key_code = (isChar ? '0' : WXK_NUMPAD0) + keysym - GDK_KP_0;
            break;

        case GDK_KP_Space:
            key_code = isChar ? ' ' : WXK_NUMPAD_SPACE;
            break;

        case GDK_KP_Tab:
            key_code = isChar ? WXK_TAB : WXK_NUMPAD_TAB;
            break;

        case GDK_KP_Enter:
            key_code = isChar ? WXK_RETURN : WXK_NUMPAD_ENTER;
            break;

        case GDK_KP_F1:
            key_code = isChar ? WXK_F1 : WXK_NUMPAD_F1;
            break;

        case GDK_KP_F2:
            key_code = isChar ? WXK_F2 : WXK_NUMPAD_F2;
            break;

        case GDK_KP_F3:
            key_code = isChar ? WXK_F3 : WXK_NUMPAD_F3;
            break;

        case GDK_KP_F4:
            key_code = isChar ? WXK_F4 : WXK_NUMPAD_F4;
            break;

        case GDK_KP_Home:
            key_code = isChar ? WXK_HOME : WXK_NUMPAD_HOME;
            break;

        case GDK_KP_Left:
            key_code = isChar ? WXK_LEFT : WXK_NUMPAD_LEFT;
            break;

        case GDK_KP_Up:
            key_code = isChar ? WXK_UP : WXK_NUMPAD_UP;
            break;

        case GDK_KP_Right:
            key_code = isChar ? WXK_RIGHT : WXK_NUMPAD_RIGHT;
            break;

        case GDK_KP_Down:
            key_code = isChar ? WXK_DOWN : WXK_NUMPAD_DOWN;
            break;

        case GDK_KP_Prior: // == GDK_KP_Page_Up
            key_code = isChar ? WXK_PRIOR : WXK_NUMPAD_PRIOR;
            break;

        case GDK_KP_Next: // == GDK_KP_Page_Down
            key_code = isChar ? WXK_NEXT : WXK_NUMPAD_NEXT;
            break;

        case GDK_KP_End:
            key_code = isChar ? WXK_END : WXK_NUMPAD_END;
            break;

        case GDK_KP_Begin:
            key_code = isChar ? WXK_HOME : WXK_NUMPAD_BEGIN;
            break;

        case GDK_KP_Insert:
            key_code = isChar ? WXK_INSERT : WXK_NUMPAD_INSERT;
            break;

        case GDK_KP_Delete:
            key_code = isChar ? WXK_DELETE : WXK_NUMPAD_DELETE;
            break;

        case GDK_KP_Equal:
            key_code = isChar ? '=' : WXK_NUMPAD_EQUAL;
            break;

        case GDK_KP_Multiply:
            key_code = isChar ? '*' : WXK_NUMPAD_MULTIPLY;
            break;

        case GDK_KP_Add:
            key_code = isChar ? '+' : WXK_NUMPAD_ADD;
            break;

        case GDK_KP_Separator:
            // FIXME: what is this?
            key_code = isChar ? '.' : WXK_NUMPAD_SEPARATOR;
            break;

        case GDK_KP_Subtract:
            key_code = isChar ? '-' : WXK_NUMPAD_SUBTRACT;
            break;

        case GDK_KP_Decimal:
            key_code = isChar ? '.' : WXK_NUMPAD_DECIMAL;
            break;

        case GDK_KP_Divide:
            key_code = isChar ? '/' : WXK_NUMPAD_DIVIDE;
            break;


        // function keys
        case GDK_F1:
        case GDK_F2:
        case GDK_F3:
        case GDK_F4:
        case GDK_F5:
        case GDK_F6:
        case GDK_F7:
        case GDK_F8:
        case GDK_F9:
        case GDK_F10:
        case GDK_F11:
        case GDK_F12:
            key_code = WXK_F1 + keysym - GDK_F1;
            break;

        default:
            key_code = 0;
    }

    return key_code;
}

static inline bool wxIsAsciiKeysym(KeySym ks)
{
    return ks < 256;
}

static void wxFillOtherKeyEventFields(wxKeyEvent& event,
                                      wxWindowGTK *win,
                                      GdkEventKey *gdk_event)
{
    int x = 0;
    int y = 0;
    GdkModifierType state;
    if (gdk_event->window)
        gdk_window_get_pointer(gdk_event->window, &x, &y, &state);

    event.SetTimestamp( gdk_event->time );
    event.SetId(win->GetId());
    event.m_shiftDown = (gdk_event->state & GDK_SHIFT_MASK) != 0;
    event.m_controlDown = (gdk_event->state & GDK_CONTROL_MASK) != 0;
    event.m_altDown = (gdk_event->state & GDK_MOD1_MASK) != 0;
    event.m_metaDown = (gdk_event->state & GDK_MOD2_MASK) != 0;
    event.m_scanCode = gdk_event->keyval;
    event.m_rawCode = (wxUint32) gdk_event->keyval;
    event.m_rawFlags = 0;
    wxGetMousePosition( &x, &y );
    win->ScreenToClient( &x, &y );
    event.m_x = x;
    event.m_y = y;
    event.SetEventObject( win );
}


static bool
wxTranslateGTKKeyEventToWx(wxKeyEvent& event,
                           wxWindowGTK *win,
                           GdkEventKey *gdk_event)
{
    // VZ: it seems that GDK_KEY_RELEASE event doesn't set event->string
    //     but only event->keyval which is quite useless to us, so remember
    //     the last character from GDK_KEY_PRESS and reuse it as last resort
    //
    // NB: should be MT-safe as we're always called from the main thread only
    static struct
    {
        KeySym keysym;
        long   keycode;
    } s_lastKeyPress = { 0, 0 };

    KeySym keysym = gdk_event->keyval;

    wxLogTrace(TRACE_KEYS, _T("Key %s event: keysym = %ld"),
               event.GetEventType() == wxEVT_KEY_UP ? _T("release")
                                                    : _T("press"),
               keysym);

    long key_code = wxTranslateKeySymToWXKey(keysym, false /* !isChar */);

    if ( !key_code )
    {
        // do we have the translation or is it a plain ASCII character?
        if ( (gdk_event->length == 1) || wxIsAsciiKeysym(keysym) )
        {
            // we should use keysym if it is ASCII as X does some translations
            // like "I pressed while Control is down" => "Ctrl-I" == "TAB"
            // which we don't want here (but which we do use for OnChar())
            if ( !wxIsAsciiKeysym(keysym) )
            {
                keysym = (KeySym)gdk_event->string[0];
            }

            // we want to always get the same key code when the same key is
            // pressed regardless of the state of the modifies, i.e. on a
            // standard US keyboard pressing '5' or '%' ('5' key with
            // Shift) should result in the same key code in OnKeyDown():
            // '5' (although OnChar() will get either '5' or '%').
            //
            // to do it we first translate keysym to keycode (== scan code)
            // and then back but always using the lower register
            Display *dpy = (Display *)wxGetDisplay();
            KeyCode keycode = XKeysymToKeycode(dpy, keysym);

            wxLogTrace(TRACE_KEYS, _T("\t-> keycode %d"), keycode);

            KeySym keysymNormalized = XKeycodeToKeysym(dpy, keycode, 0);

            // use the normalized, i.e. lower register, keysym if we've
            // got one
            key_code = keysymNormalized ? keysymNormalized : keysym;

            // as explained above, we want to have lower register key codes
            // normally but for the letter keys we want to have the upper ones
            //
            // NB: don't use XConvertCase() here, we want to do it for letters
            // only
            key_code = toupper(key_code);
        }
        else // non ASCII key, what to do?
        {
            // by default, ignore it
            key_code = 0;

            // but if we have cached information from the last KEY_PRESS
            if ( gdk_event->type == GDK_KEY_RELEASE )
            {
                // then reuse it
                if ( keysym == s_lastKeyPress.keysym )
                {
                    key_code = s_lastKeyPress.keycode;
                }
            }
        }

        if ( gdk_event->type == GDK_KEY_PRESS )
        {
            // remember it to be reused for KEY_UP event later
            s_lastKeyPress.keysym = keysym;
            s_lastKeyPress.keycode = key_code;
        }
    }

    wxLogTrace(TRACE_KEYS, _T("\t-> wxKeyCode %ld"), key_code);

    // sending unknown key events doesn't really make sense
    if ( !key_code )
        return false;

    // now fill all the other fields
    wxFillOtherKeyEventFields(event, win, gdk_event);

    event.m_keyCode = key_code;
#if wxUSE_UNICODE
    if ( gdk_event->type == GDK_KEY_PRESS ||  gdk_event->type == GDK_KEY_RELEASE )
    {
        event.m_uniChar = key_code;
    }
#endif

    return true;
}


#ifdef __WXGTK20__
struct wxGtkIMData
{
    GtkIMContext *context;
    GdkEventKey  *lastKeyEvent;

    wxGtkIMData()
    {
        context = gtk_im_multicontext_new();
        lastKeyEvent = NULL;
    }
    ~wxGtkIMData()
    {
        g_object_unref(context);
    }
};
#endif

extern "C" {
static gint gtk_window_key_press_callback( GtkWidget *widget,
                                           GdkEventKey *gdk_event,
                                           wxWindow *win )
{
    DEBUG_MAIN_THREAD

    if (g_isIdle)
        wxapp_install_idle_handler();

    if (!win->m_hasVMT)
        return FALSE;
    if (g_blockEventsOnDrag)
        return FALSE;


    wxKeyEvent event( wxEVT_KEY_DOWN );
    bool ret = false;
    bool return_after_IM = false;

    if( wxTranslateGTKKeyEventToWx(event, win, gdk_event) )
    {
        // Emit KEY_DOWN event
        ret = win->GetEventHandler()->ProcessEvent( event );
    }
    else
    {
        // Return after IM processing as we cannot do
        // anything with it anyhow.
        return_after_IM = true;
    }

#ifdef __WXGTK20__
    // 2005.01.26 modified by Hong Jen Yee ([e-mail]):
    // When we get a key_press event here, it could be originate
    // from the current widget or its child widgets.  However, only the widget
    // with the INPUT FOCUS can generate the INITIAL key_press event.  That is,
    // if the CURRENT widget doesn't have the FOCUS at all, this event definitely
    // originated from its child widgets and shouldn't be passed to IM context.
    // In fact, what a GTK+ IM should do is filtering keyEvents and convert them
    // into text input ONLY WHEN THE WIDGET HAS INPUT FOCUS.  Besides, when current
    // widgets has both IM context and input focus, the event should be filtered
    // by gtk_im_context_filter_keypress().
    // Then, we should, according to GTK+ 2.0 API doc, return whatever it returns.
    if ((!ret) && (win->m_imData != NULL) && ( wxWindow::FindFocus() == win ))
    {
        // We should let GTK+ IM filter key event first. According to GTK+ 2.0 API
        // docs, if IM filter returns true, no further processing should be done.
        // we should send the key_down event anyway.
        bool intercepted_by_IM = gtk_im_context_filter_keypress(win->m_imData->context, gdk_event);
        win->m_imData->lastKeyEvent = NULL;
        if (intercepted_by_IM)
        {
            wxLogTrace(TRACE_KEYS, _T("Key event intercepted by IM"));
            return true;