private void emitChanges() {
        for (SettingsChangesListener listener : listeners) {
            listener.chatLoggingChanged( isEventEnabled("log-chat") );
            listener.topicVisibilityChanged( isViewEnabled("display-topic") );
            String format = isViewEnabled("timestamp-enabled") ? getViewTimestampFormat() : "";
            listener.timestampFormatChanged(format);
        }
    }