001/* 002 * This library is part of OpenCms - 003 * the Open Source Content Management System 004 * 005 * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com) 006 * 007 * This library is free software; you can redistribute it and/or 008 * modify it under the terms of the GNU Lesser General Public 009 * License as published by the Free Software Foundation; either 010 * version 2.1 of the License, or (at your option) any later version. 011 * 012 * This library is distributed in the hope that it will be useful, 013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 015 * Lesser General Public License for more details. 016 * 017 * For further information about Alkacon Software, please see the 018 * company website: http://www.alkacon.com 019 * 020 * For further information about OpenCms, please see the 021 * project website: http://www.opencms.org 022 * 023 * You should have received a copy of the GNU Lesser General Public 024 * License along with this library; if not, write to the Free Software 025 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 026 */ 027 028package org.opencms.gwt.client.ui; 029 030import com.google.gwt.event.shared.HandlerRegistration; 031import com.google.gwt.event.shared.HasHandlers; 032 033/** 034 * Interface to indicate that the implementing widget may have toggle event handlers.<p> 035 * 036 * @since 8.0.0 037 * 038 */ 039public interface I_CmsHasToggleHandlers extends HasHandlers { 040 041 /** 042 * Registers the toggle event handler.<p> 043 * 044 * @param handler the event handler 045 * 046 * @return the handler registration of this widget, may be used to remove the event handler 047 */ 048 HandlerRegistration addToggleHandler(I_CmsToggleHandler handler); 049}