events.c

        else if (((ev->message_type == display_info->atoms[WIN_WORKSPACE_COUNT]) || 
                  (ev->message_type == display_info->atoms[NET_NUMBER_OF_DESKTOPS])) && (ev->format == 32))
        {
            TRACE ("root has received a win_workspace_count event");
            if (ev->data.l[0] != screen_info->workspace_count)
            {
                workspaceSetCount (screen_info, ev->data.l[0]);
                getDesktopLayout(display_info, screen_info->xroot, screen_info->workspace_count, &screen_info->desktop_layout);
            }
        }
#ifdef ENABLE_KDE_SYSTRAY_PROXY
        else if ((ev->message_type == display_info->atoms[MANAGER]) && (ev->data.l[1] == screen_info->net_system_tray_selection) && (ev->format == 32))
        {
            TRACE ("root has received a net_system_tray_manager event");
            screen_info->systray = getSystrayWindow (display_info, screen_info->net_system_tray_selection);
        }
#endif
        else if ((ev->message_type == display_info->atoms[NET_SHOWING_DESKTOP]) && (ev->format == 32))
        {
            TRACE ("root has received a net_showing_desktop event");
            screen_info->show_desktop = (ev->data.l[0] != 0);
            clientToggleShowDesktop (screen_info);
            setHint (display_info, screen_info->xroot, NET_SHOWING_DESKTOP, ev->data.l[0]);
        }
        else if (ev->message_type == display_info->atoms[NET_REQUEST_FRAME_EXTENTS])
        {
            TRACE ("window (0x%lx) has received a net_request_frame_extents event", c->name, ev->window);
            /* Size estimate from the decoration extents */
            setNetFrameExtents (display_info, ev->window, 
                                frameDecorationTop (screen_info),
                                frameDecorationLeft (screen_info),
                                frameDecorationRight (screen_info),
                                frameDecorationBottom (screen_info));
        }
        else
        {
            TRACE ("unidentified client message for window 0x%lx", ev->window);
        }
    }
}

static void
handleShape (DisplayInfo *display_info, XShapeEvent * ev)
{
    Client *c = NULL;

    TRACE ("entering handleShape");

    c = myDisplayGetClientFromWindow (display_info, ev->window, WINDOW);
    if (c)
    {
        if (ev->kind == ShapeBounding)
        {
            if ((ev->shaped) && !FLAG_TEST (c->flags, CLIENT_FLAG_HAS_SHAPE))
            {
                FLAG_SET (c->flags, CLIENT_FLAG_HAS_SHAPE);
            }
            else if (!(ev->shaped) && FLAG_TEST (c->flags, CLIENT_FLAG_HAS_SHAPE))
            {
                FLAG_UNSET (c->flags, CLIENT_FLAG_HAS_SHAPE);
            }
        }
        frameDraw (c, FALSE, TRUE);
    }
}

static void
handleColormapNotify (DisplayInfo *display_info, XColormapEvent * ev)
{
    Client *c = NULL;

    TRACE ("entering handleColormapNotify");

    c = myDisplayGetClientFromWindow (display_info, ev->window, WINDOW);
    if ((c) && (ev->window == c->window) && (ev->new))
    {
        if (c == clientGetFocus ())
        {
            clientInstallColormaps (c);
        }
    }
}

static void
handleMappingNotify (DisplayInfo *display_info, XMappingEvent * ev)
{
    GSList *screens;

    TRACE ("entering handleMappingNotify");

    /* Refreshes the stored modifier and keymap information */
    XRefreshKeyboardMapping (ev);

    /* Update internal modifiers masks if necessary */
    if (ev->request == MappingModifier)
    {
        TRACE ("handleMappingNotify: modifiers mapping has changed");
        initModifiers (display_info->dpy);
    }

    /* Regrab all keys if the notify is for keyboard (ie not pointer) */
    if (ev->request != MappingPointer)
    {
        TRACE ("handleMappingNotify: Regrab keys");
        for (screens = display_info->screens; screens; screens = g_slist_next (screens))
        {
            ScreenInfo *screen_info = (ScreenInfo *) screens->data;

            /* We need to reload all the settings to recompute the key bindings... */
            loadSettings (screen_info);

            /* ...then update all frames grabs... */
            clientUpdateAllFrames (screen_info, UPDATE_BUTTON_GRABS | UPDATE_KEY_GRABS);

            /* ...and regrab the keys we have on the root win... */
            myScreenGrabKeys (screen_info);
        }
    }
}

static void
handleEvent (DisplayInfo *display_info, XEvent * ev)
{
    TRACE ("entering handleEvent");

    /* Update the display time */
    myDisplayUpdateCurentTime (display_info, ev);

    sn_process_event (ev);
    compositorHandleEvent (display_info, ev);
    switch (ev->type)
    {
        case MotionNotify:
            handleMotionNotify (display_info, (XMotionEvent *) ev);
            break;
        case KeyPress:
            handleKeyPress (display_info, (XKeyEvent *) ev);
            break;
        case ButtonPress:
            handleButtonPress (display_info, (XButtonEvent *) ev);
            break;
        case ButtonRelease:
            handleButtonRelease (display_info, (XButtonEvent *) ev);
            break;
        case DestroyNotify:
            handleDestroyNotify (display_info, (XDestroyWindowEvent *) ev);
            break;
        case UnmapNotify:
            handleUnmapNotify (display_info, (XUnmapEvent *) ev);
            break;
        case MapRequest:
            handleMapRequest (display_info, (XMapRequestEvent *) ev);
            break;
        case MapNotify:
            handleMapNotify (display_info, (XMapEvent *) ev);
            break;
        case ConfigureNotify:
            handleConfigureNotify (display_info, (XConfigureEvent *) ev);
            break;
        case ConfigureRequest:
            handleConfigureRequest (display_info, (XConfigureRequestEvent *) ev);
            break;
        case EnterNotify:
            handleEnterNotify (display_info, (XCrossingEvent *) ev);
            break;
        case LeaveNotify:
            handleLeaveNotify (display_info, (XCrossingEvent *) ev);
            break;
        case FocusIn:
            handleFocusIn (display_info, (XFocusChangeEvent *) ev);
            break;
        case FocusOut:
            handleFocusOut (display_info, (XFocusChangeEvent *) ev);
            break;
        case PropertyNotify:
            handlePropertyNotify (display_info, (XPropertyEvent *) ev);
            break;
        case ClientMessage:
            handleClientMessage (display_info, (XClientMessageEvent *) ev);
            break;
        case ColormapNotify:
            handleColormapNotify (display_info, (XColormapEvent *) ev);
            break;
        case MappingNotify:
            handleMappingNotify (display_info, (XMappingEvent *) ev);
            break;
        default:
            if ((display_info->have_shape) && (ev->type == display_info->shape_event_base))
            {
                handleShape (display_info, (XShapeEvent *) ev);
            }
    }
    if (!gdk_events_pending () && !XPending (display_info->dpy))
    {
        if (xfwm4_reload)
        {
            reloadSettings (display_info, UPDATE_ALL);
            xfwm4_reload = FALSE;
        }
        else if (xfwm4_quit)
        {
            gtk_main_quit ();
        }
    }
}

XfceFilterStatus
xfwm4_event_filter (XEvent * xevent, gpointer data)
{
    DisplayInfo *display_info = (DisplayInfo *) data;
    
    g_assert (display_info);
    
    TRACE ("entering xfwm4_event_filter");
    handleEvent (display_info, xevent);
    TRACE ("leaving xfwm4_event_filter");
    return XEV_FILTER_STOP;
}

/* GTK specific stuff */

static void
menu_callback (Menu * menu, MenuOp op, Window xid, gpointer menu_data, gpointer item_data)
{
    Client *c = NULL;

    TRACE ("entering menu_callback");

    if (!xfwmWindowDeleted(&menu_event_window))
    {
        xfwmWindowDelete (&menu_event_window);
    }

    if ((menu_data != NULL) && (xid != None))
    {
        ScreenInfo *screen_info = (ScreenInfo *) menu_data;
        c = clientGetFromWindow (screen_info, xid, WINDOW);
    }

    if (c)
    {
        c->button_pressed[MENU_BUTTON] = FALSE;

        switch (op)
        {
            case MENU_OP_QUIT:
                gtk_main_quit ();
                break;
            case MENU_OP_MAXIMIZE:
            case MENU_OP_UNMAXIMIZE:
                if (CLIENT_CAN_MAXIMIZE_WINDOW (c))
                {
                    clientToggleMaximized (c, WIN_STATE_MAXIMIZED, TRUE);
                }
                break;
            case MENU_OP_MINIMIZE:
                if (CLIENT_CAN_HIDE_WINDOW (c))
                {
                    clientHide (c, c->win_workspace, TRUE);
                }
                frameDraw (c, FALSE, FALSE);
                break;
            case MENU_OP_MINIMIZE_ALL:
                clientHideAll (c, c->win_workspace);
                frameDraw (c, FALSE, FALSE);
                break;
            case MENU_OP_UNMINIMIZE:
                clientShow (c, TRUE);
                clientClearAllShowDesktop (c->screen_info);
                break;
            case MENU_OP_SHADE:
            case MENU_OP_UNSHADE:
                clientToggleShaded (c);
                break;
            case MENU_OP_STICK:
            case MENU_OP_UNSTICK:
                clientToggleSticky (c, TRUE);
                frameDraw (c, FALSE, FALSE);
                break;
            case MENU_OP_WORKSPACES:
                clientSetWorkspace (c, GPOINTER_TO_INT (item_data), TRUE);
                frameDraw (c, FALSE, FALSE);
                break;
            case MENU_OP_DELETE:
                frameDraw (c, FALSE, FALSE);
                clientClose (c);
                break;
            case MENU_OP_CONTEXT_HELP:
                clientEnterContextMenuState (c);
                frameDraw (c, FALSE, FALSE);
                break;
            case MENU_OP_ABOVE:
            case MENU_OP_NORMAL:
                clientToggleAbove (c);
                /* Fall thru */
            default:
                frameDraw (c, FALSE, FALSE);
                break;
        }
    }
    else
    {
        gdk_beep ();
    }
    menu_free (menu);
}

void
initMenuEventWin (void)
{
    xfwmWindowInit (&menu_event_window);
}

static gboolean
show_popup_cb (GtkWidget * widget, GdkEventButton * ev, gpointer data)
{
    ScreenInfo *screen_info = NULL;
    DisplayInfo *display_info = NULL;
    Menu *menu;
    MenuOp ops;
    MenuOp insensitive;
    Client *c = (Client *) data;
    gint x = ev->x_root;
    gint y = ev->y_root;
    
    TRACE ("entering show_popup_cb");

    if ((c) && ((ev->button == 1) || (ev->button == 3)))
    {
        c->button_pressed[MENU_BUTTON] = TRUE;
        frameDraw (c, FALSE, FALSE);
        y = c->y;
        ops = MENU_OP_DELETE | MENU_OP_MINIMIZE_ALL | MENU_OP_WORKSPACES;
        insensitive = 0;

        if (!FLAG_TEST (c->xfwm_flags, XFWM_FLAG_HAS_CLOSE))
        {
            insensitive |= MENU_OP_DELETE;
        }

        if (FLAG_TEST (c->flags, CLIENT_FLAG_MAXIMIZED))
        {
            ops |= MENU_OP_UNMAXIMIZE;
            if (!CLIENT_CAN_MAXIMIZE_WINDOW (c))
            {
                insensitive |= MENU_OP_UNMAXIMIZE;
            }
        }
        else
        {
            ops |= MENU_OP_MAXIMIZE;
            if (!CLIENT_CAN_MAXIMIZE_WINDOW (c))
            {
                insensitive |= MENU_OP_MAXIMIZE;
            }
        }

        if (FLAG_TEST (c->flags, CLIENT_FLAG_ICONIFIED))
        {
            ops |= MENU_OP_UNMINIMIZE;
            if (!CLIENT_CAN_HIDE_WINDOW (c))
            {
                insensitive |= MENU_OP_UNMINIMIZE;
            }
        }
        else
        {
            ops |= MENU_OP_MINIMIZE;
            if (!CLIENT_CAN_HIDE_WINDOW (c))
            {
                insensitive |= MENU_OP_MINIMIZE;
            }
        }

        if (FLAG_TEST (c->flags, CLIENT_FLAG_SHADED))
        {
            ops |= MENU_OP_UNSHADE;
        }
        else
        {
            ops |= MENU_OP_SHADE;
        }

        if (FLAG_TEST (c->flags, CLIENT_FLAG_STICKY))
        {
            ops |= MENU_OP_UNSTICK;
            if (!CLIENT_CAN_STICK_WINDOW(c))
            {
                insensitive |= MENU_OP_UNSTICK;
            }
        }
        else
        {
            ops |= MENU_OP_STICK;
            if (!CLIENT_CAN_STICK_WINDOW(c))
            {
                insensitive |= MENU_OP_STICK;
            }
        }
    
        /* KDE extension */
        clientGetWMProtocols(c);
        if (FLAG_TEST (c->wm_flags, WM_FLAG_CONTEXT_HELP))
        {
            ops |= MENU_OP_CONTEXT_HELP;
        }

        if (FLAG_TEST(c->flags, CLIENT_FLAG_ABOVE))
        {
            ops |= MENU_OP_NORMAL;
            if (clientIsValidTransientOrModal (c) || 
                FLAG_TEST (c->flags, CLIENT_FLAG_BELOW | CLIENT_FLAG_FULLSCREEN))
            {
                insensitive |= MENU_OP_NORMAL;
            }
        }
        else
        {
            ops |= MENU_OP_ABOVE;
            if (clientIsValidTransientOrModal (c) || 
                FLAG_TEST (c->flags, CLIENT_FLAG_BELOW | CLIENT_FLAG_FULLSCREEN))
            {
                insensitive |= MENU_OP_ABOVE;
            }
        }

        if (clientIsValidTransientOrModal (c)
            || !FLAG_TEST (c->xfwm_flags, XFWM_FLAG_HAS_STICK)
            || FLAG_TEST (c->flags, CLIENT_FLAG_STICKY))
        {
            insensitive |= MENU_OP_WORKSPACES;
        }
    }
    else
    {
        return (TRUE);
    }
    
    /* c is not null here */
    screen_info = c->screen_info;
    display_info = screen_info->display_info;
    
    if (screen_info->button_handler_id)
    {
        g_signal_handler_disconnect (GTK_OBJECT (myScreenGetGtkWidget (screen_info)), screen_info->button_handler_id);
    }
    screen_info->button_handler_id = g_signal_connect (GTK_OBJECT (myScreenGetGtkWidget (screen_info)),
                                              "button_press_event", GTK_SIGNAL_FUNC (show_popup_cb), (gpointer) NULL);

    if (!xfwmWindowDeleted(&menu_event_window))
    {
        xfwmWindowDelete (&menu_event_window);
    }
    /*
       Since all button press/release events are catched by the windows frames, there is some
       side effect with GTK menu. When a menu is opened, any click on the window frame is not
       detected as a click outside the menu, and the menu doesn't close.
       To avoid this (painless but annoying) behaviour, we just setup a no event window that
       "hides" the events to regular windows.
       That might look tricky, but it's very efficient and save plenty of lines of complicated
       code.
       Don't forget to delete that window once the menu is closed, though, or we'll get in
       trouble.
     */
    xfwmWindowTemp (screen_info,  
                    NULL, 0,
                    screen_info->xroot,
                    &menu_event_window, 0, 0, 
                    gdk_screen_get_width (screen_info->gscr),
                    gdk_screen_get_height (screen_info->gscr), 
                    NoEventMask);
    menu = menu_default (screen_info->gscr, c->window, ops, insensitive, menu_callback, 
                         c->win_workspace, screen_info->workspace_count, 
                         screen_info->workspace_names, screen_info->workspace_names_items,
                         display_info->xfilter, screen_info);

    if (!menu_popup (menu, x, y, ev->button, ev->time))
    {
        TRACE ("Cannot open menu");
        gdk_beep ();
        c->button_pressed[MENU_BUTTON] = FALSE;
        frameDraw (c, FALSE, FALSE);
        xfwmWindowDelete (&menu_event_window);
        menu_free (menu);
    }
    return (TRUE);
}

static gboolean
set_reload (GObject * obj, GdkEvent * ev, gpointer data)
{
    TRACE ("setting reload flag so all prefs will be reread at next event loop");
    xfwm4_reload = TRUE;
    return (TRUE);
}

static gboolean
dbl_click_time_cb (GObject * obj, GdkEvent * ev, gpointer data)
{
    DisplayInfo *display_info = (DisplayInfo *) data;
    GValue tmp_val = { 0, };

    g_return_val_if_fail (display_info, TRUE);
    
    g_value_init (&tmp_val, G_TYPE_INT);
    if (gdk_setting_get ("gtk-double-click-time", &tmp_val))
    {
        display_info->dbl_click_time = abs (g_value_get_int (&tmp_val));
    }

    return (TRUE);
}

static gboolean
client_event_cb (GtkWidget * widget, GdkEventClient * ev, gpointer data)
{
    TRACE ("entering client_event_cb");

    if (!atom_rcfiles)
    {
        atom_rcfiles = gdk_atom_intern ("_GTK_READ_RCFILES", FALSE);
    }

    if (ev->message_type == atom_rcfiles)
    {
        set_reload (G_OBJECT (widget), (GdkEvent *) ev, data);
    }

    return (FALSE);
}

void
initGtkCallbacks (ScreenInfo *screen_info)
{
    GtkSettings *settings;

    screen_info->button_handler_id = 
        g_signal_connect (GTK_OBJECT (myScreenGetGtkWidget (screen_info)),
                          "button_press_event", GTK_SIGNAL_FUNC (show_popup_cb), (gpointer) NULL);
    g_signal_connect (GTK_OBJECT (myScreenGetGtkWidget (screen_info)), "client_event",
                      GTK_SIGNAL_FUNC (client_event_cb), NULL);
    settings = gtk_settings_get_default ();
    if (settings)
    {
        g_signal_connect (settings, "notify::gtk-theme-name",
            G_CALLBACK (set_reload), NULL);
        g_signal_connect (settings, "notify::gtk-font-name",
            G_CALLBACK (set_reload), NULL);
        g_signal_connect (settings, "notify::gtk-double-click-time",
            G_CALLBACK (dbl_click_time_cb), (gpointer) (screen_info->display_info));
    }
}