001/*
002 * This library is part of OpenCms -
003 * the Open Source Content Management System
004 *
005 * Copyright (C) Alkacon Software (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.input.upload;
029
030/**
031 * Handler interface for upload buttons which is mainly used to perform actions when the selected file
032 * in a file input has been changed.<p>
033 */
034public interface I_CmsUploadButtonHandler {
035
036    /**
037     * Custom setup method for newly created file inputs.<p>
038     *
039     * @param fileInput the new file input
040     */
041    void initializeFileInput(CmsFileInput fileInput);
042
043    /**
044     * Notifies the button handler that the file input field's value has changed.<p>
045     *
046     * @param fileInput the file input
047     */
048    void onChange(CmsFileInput fileInput);
049
050    /**
051     * This method should be called when the handler is set on a button.<p>
052     *
053     * @param button the button for which the handler instance has been set
054     */
055    void setButton(I_CmsUploadButton button);
056}