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/* * Copyright (c) 1997, 2005, 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.basic; import javax.swing.*;import javax.swing.event.*;import javax.swing.border.*; import java.awt.*; import java.io.Serializable;  /** * ComboBox renderer * <p> * <strong>Warning:</strong> * Serialized objects of this class will not be compatible with * future Swing releases. The current serialization support is * appropriate for short term storage or RMI between applications running * the same version of Swing.  As of 1.4, support for long term storage * of all JavaBeans<sup><font size="-2">TM</font></sup> * has been added to the <code>java.beans</code> package. * Please see {@link java.beans.XMLEncoder}. * * @author Arnaud Weber */public class BasicComboBoxRenderer extends JLabelimplements ListCellRenderer, Serializable {    /**    * An empty <code>Border</code>. This field might not be used. To change the    * <code>Border</code> used by this renderer directly set it using    * the <code>setBorder</code> method.    */    protected static Border noFocusBorder = new EmptyBorder(1, 1, 1, 1);    private final static Border SAFE_NO_FOCUS_BORDER = new EmptyBorder(1, 1, 1, 1);     public BasicComboBoxRenderer() {        super();        setOpaque(true);        setBorder(getNoFocusBorder());    }     private static Border getNoFocusBorder() {        if (System.getSecurityManager() != null) {            return SAFE_NO_FOCUS_BORDER;        } else {            return noFocusBorder;        }    }     public Dimension getPreferredSize() {        Dimension size;         if ((this.getText() == null) || (this.getText().equals( "" ))) {            setText( " " );            size = super.getPreferredSize();            setText( "" );        }        else {            size = super.getPreferredSize();        }         return size;    }     public Component getListCellRendererComponent(                                                 JList list,                                                 Object value,                                                 int index,                                                 boolean isSelected,                                                 boolean cellHasFocus)    {         /**if (isSelected) {            setBackground(UIManager.getColor("ComboBox.selectionBackground"));            setForeground(UIManager.getColor("ComboBox.selectionForeground"));        } else {            setBackground(UIManager.getColor("ComboBox.background"));            setForeground(UIManager.getColor("ComboBox.foreground"));        }**/         if (isSelected) {            setBackground(list.getSelectionBackground());            setForeground(list.getSelectionForeground());        }        else {            setBackground(list.getBackground());            setForeground(list.getForeground());        }         setFont(list.getFont());         if (value instanceof Icon) {            setIcon((Icon)value);        }        else {            setText((value == null) ? "" : value.toString());        }        return this;    }      /**     * A subclass of BasicComboBoxRenderer that implements UIResource.     * BasicComboBoxRenderer doesn't implement UIResource     * directly so that applications can safely override the     * cellRenderer property with BasicListCellRenderer subclasses.     * <p>     * <strong>Warning:</strong>     * Serialized objects of this class will not be compatible with     * future Swing releases. The current serialization support is     * appropriate for short term storage or RMI between applications running     * the same version of Swing.  As of 1.4, support for long term storage     * of all JavaBeans<sup><font size="-2">TM</font></sup>     * has been added to the <code>java.beans</code> package.     * Please see {@link java.beans.XMLEncoder}.     */    public static class UIResource extends BasicComboBoxRenderer implements javax.swing.plaf.UIResource {    }}