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.client.login;
029
030import com.google.gwt.core.client.Scheduler;
031import com.google.gwt.core.client.Scheduler.RepeatingCommand;
032import com.google.gwt.dom.client.Element;
033import com.vaadin.v7.client.ui.VTextField;
034
035/**
036 * Abstract superclass for the user name and password fields of the login dialog.<p>
037 *
038 * Since these fields may be pre-filled by the browser password manager and not by the server side
039 * component, they require some special handling.<p>
040 */
041public class A_CmsLoginField extends VTextField {
042
043    /** True if the intial call to updateFieldContent has already occured. */
044    private boolean m_initialUpdateCalled;
045
046    /**
047     * Creates a new instance based on an existing dom input element.<p>
048     *
049     * @param element the input element to use for the widget
050     */
051    protected A_CmsLoginField(Element element) {
052
053        super(element);
054    }
055
056    /**
057     * @see com.vaadin.client.ui.VTextField#updateFieldContent(java.lang.String)
058     *
059     * We have to override this method to prevent its value being overwritten by Vaadin and to make
060     * sure that the real value is sent to the server.
061     */
062    @Override
063    public void updateFieldContent(String text) {
064
065        if (!m_initialUpdateCalled) {
066            m_initialUpdateCalled = true;
067            if ("".equals(text)) {
068                valueChange(false);
069                Scheduler.get().scheduleFixedDelay(new RepeatingCommand() {
070
071                    public boolean execute() {
072
073                        if (isAttached()) {
074                            valueChange(false);
075                            return true;
076                        } else {
077                            return false;
078                        }
079                    }
080                }, 100);
081                return;
082            }
083
084        }
085        super.updateFieldContent(text);
086    }
087
088}