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}