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.ui.components.extensions;
029
030import org.opencms.ui.shared.components.CmsAutoGrowingTextAreaState;
031
032import com.vaadin.server.AbstractExtension;
033import com.vaadin.v7.ui.TextArea;
034
035/**
036 * Extension to add a CSS class to any component depending on it's scroll position.<p>
037 */
038public class CmsAutoGrowingTextArea extends AbstractExtension {
039
040    /** The serial version id. */
041    private static final long serialVersionUID = 8321661587169935234L;
042
043    /**
044     * Constructor.<p>
045     *
046     * @param textArea the text area to extend
047     * @param maxRows the maximal number of rows (<1 for unlimited)
048     */
049    public CmsAutoGrowingTextArea(TextArea textArea, int maxRows) {
050        super.extend(textArea);
051        getState().setMaxRows(maxRows);
052        getState().setMinRows(textArea.getRows());
053    }
054
055    /**
056     * Adds the text area auto grow extension to the given component.
057     *
058     * @param textArea the text area to extend
059     * @param maxRows the maximal number of rows (<1 for unlimited)
060     */
061    @SuppressWarnings("unused")
062    public static void addTo(TextArea textArea, int maxRows) {
063
064        new CmsAutoGrowingTextArea(textArea, maxRows);
065    }
066
067    /**
068     * @see com.vaadin.server.AbstractClientConnector#getState()
069     */
070    @Override
071    protected CmsAutoGrowingTextAreaState getState() {
072
073        return (CmsAutoGrowingTextAreaState)super.getState();
074    }
075
076}