/* * Copyright (c) 1997, 2000, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package javax.swing.plaf; import javax.swing.JComboBox; /** * Pluggable look and feel interface for JComboBox. * * @author Arnaud Weber * @author Tom Santos */public abstract class ComboBoxUI extends ComponentUI {     /**     * Set the visiblity of the popup     */    public abstract void setPopupVisible( JComboBox c, boolean v );     /**     * Determine the visibility of the popup     */    public abstract boolean isPopupVisible( JComboBox c );     /**     * Determine whether or not the combo box itself is traversable     */    public abstract boolean isFocusTraversable( JComboBox c );}