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.input;
029
030import com.google.gwt.event.dom.client.KeyUpEvent;
031import com.google.gwt.event.dom.client.KeyUpHandler;
032import com.google.gwt.event.logical.shared.ValueChangeEvent;
033import com.google.gwt.user.client.ui.TextBox;
034
035/**
036 * A simple text box firing change events whenever a key is pressed and the value has changed.<p>
037 */
038public class CmsSimpleTextBox extends TextBox {
039
040    /** The previous value. */
041    private String m_previousValue;
042
043    /**
044     * Constructor.<p>
045     */
046    public CmsSimpleTextBox() {
047
048        super();
049        addDomHandler(new KeyUpHandler() {
050
051            public void onKeyUp(KeyUpEvent event) {
052
053                fireChange();
054            }
055        }, KeyUpEvent.getType());
056    }
057
058    /**
059     * @see com.google.gwt.user.client.ui.ValueBoxBase#setValue(java.lang.Object, boolean)
060     */
061    @Override
062    public void setValue(String value, boolean fireEvents) {
063
064        m_previousValue = value;
065        super.setValue(value, fireEvents);
066    }
067
068    /**
069     * Triggered on key press to fire event if the value changed.<p>
070     */
071    void fireChange() {
072
073        ValueChangeEvent.fireIfNotEqual(this, m_previousValue, getValue());
074        m_previousValue = getValue();
075    }
076}