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    1   /*
    2    * Copyright (c) 1997, 2005, Oracle and/or its affiliates. All rights reserved.
    3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    4    *
    5    * This code is free software; you can redistribute it and/or modify it
    6    * under the terms of the GNU General Public License version 2 only, as
    7    * published by the Free Software Foundation.  Oracle designates this
    8    * particular file as subject to the "Classpath" exception as provided
    9    * by Oracle in the LICENSE file that accompanied this code.
   10    *
   11    * This code is distributed in the hope that it will be useful, but WITHOUT
   12    * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   13    * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   14    * version 2 for more details (a copy is included in the LICENSE file that
   15    * accompanied this code).
   16    *
   17    * You should have received a copy of the GNU General Public License version
   18    * 2 along with this work; if not, write to the Free Software Foundation,
   19    * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   20    *
   21    * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   package javax.swing.plaf.basic;
   26   
   27   import javax.swing;
   28   import javax.swing.event;
   29   import javax.swing.border;
   30   
   31   import java.awt;
   32   
   33   import java.io.Serializable;
   34   
   35   
   36   /**
   37    * ComboBox renderer
   38    * <p>
   39    * <strong>Warning:</strong>
   40    * Serialized objects of this class will not be compatible with
   41    * future Swing releases. The current serialization support is
   42    * appropriate for short term storage or RMI between applications running
   43    * the same version of Swing.  As of 1.4, support for long term storage
   44    * of all JavaBeans<sup><font size="-2">TM</font></sup>
   45    * has been added to the <code>java.beans</code> package.
   46    * Please see {@link java.beans.XMLEncoder}.
   47    *
   48    * @author Arnaud Weber
   49    */
   50   public class BasicComboBoxRenderer extends JLabel
   51   implements ListCellRenderer, Serializable {
   52   
   53      /**
   54       * An empty <code>Border</code>. This field might not be used. To change the
   55       * <code>Border</code> used by this renderer directly set it using
   56       * the <code>setBorder</code> method.
   57       */
   58       protected static Border noFocusBorder = new EmptyBorder(1, 1, 1, 1);
   59       private final static Border SAFE_NO_FOCUS_BORDER = new EmptyBorder(1, 1, 1, 1);
   60   
   61       public BasicComboBoxRenderer() {
   62           super();
   63           setOpaque(true);
   64           setBorder(getNoFocusBorder());
   65       }
   66   
   67       private static Border getNoFocusBorder() {
   68           if (System.getSecurityManager() != null) {
   69               return SAFE_NO_FOCUS_BORDER;
   70           } else {
   71               return noFocusBorder;
   72           }
   73       }
   74   
   75       public Dimension getPreferredSize() {
   76           Dimension size;
   77   
   78           if ((this.getText() == null) || (this.getText().equals( "" ))) {
   79               setText( " " );
   80               size = super.getPreferredSize();
   81               setText( "" );
   82           }
   83           else {
   84               size = super.getPreferredSize();
   85           }
   86   
   87           return size;
   88       }
   89   
   90       public Component getListCellRendererComponent(
   91                                                    JList list,
   92                                                    Object value,
   93                                                    int index,
   94                                                    boolean isSelected,
   95                                                    boolean cellHasFocus)
   96       {
   97   
   98           /**if (isSelected) {
   99               setBackground(UIManager.getColor("ComboBox.selectionBackground"));
  100               setForeground(UIManager.getColor("ComboBox.selectionForeground"));
  101           } else {
  102               setBackground(UIManager.getColor("ComboBox.background"));
  103               setForeground(UIManager.getColor("ComboBox.foreground"));
  104           }**/
  105   
  106           if (isSelected) {
  107               setBackground(list.getSelectionBackground());
  108               setForeground(list.getSelectionForeground());
  109           }
  110           else {
  111               setBackground(list.getBackground());
  112               setForeground(list.getForeground());
  113           }
  114   
  115           setFont(list.getFont());
  116   
  117           if (value instanceof Icon) {
  118               setIcon((Icon)value);
  119           }
  120           else {
  121               setText((value == null) ? "" : value.toString());
  122           }
  123           return this;
  124       }
  125   
  126   
  127       /**
  128        * A subclass of BasicComboBoxRenderer that implements UIResource.
  129        * BasicComboBoxRenderer doesn't implement UIResource
  130        * directly so that applications can safely override the
  131        * cellRenderer property with BasicListCellRenderer subclasses.
  132        * <p>
  133        * <strong>Warning:</strong>
  134        * Serialized objects of this class will not be compatible with
  135        * future Swing releases. The current serialization support is
  136        * appropriate for short term storage or RMI between applications running
  137        * the same version of Swing.  As of 1.4, support for long term storage
  138        * of all JavaBeans<sup><font size="-2">TM</font></sup>
  139        * has been added to the <code>java.beans</code> package.
  140        * Please see {@link java.beans.XMLEncoder}.
  141        */
  142       public static class UIResource extends BasicComboBoxRenderer implements javax.swing.plaf.UIResource {
  143       }
  144   }

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