1 /* 2 * Copyright (c) 1997, 2014, 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™ 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 @SuppressWarnings("serial") // Same-version serialization only 51 public class BasicComboBoxRenderer extends JLabel 52 implements ListCellRenderer, Serializable { 53 54 /** 55 * An empty <code>Border</code>. This field might not be used. To change the 56 * <code>Border</code> used by this renderer directly set it using 57 * the <code>setBorder</code> method. 58 */ 59 protected static Border noFocusBorder = new EmptyBorder(1, 1, 1, 1); 60 private final static Border SAFE_NO_FOCUS_BORDER = new EmptyBorder(1, 1, 1, 1); 61 62 public BasicComboBoxRenderer() { 63 super(); 64 setOpaque(true); 65 setBorder(getNoFocusBorder()); 66 } 67 68 private static Border getNoFocusBorder() { 69 if (System.getSecurityManager() != null) { 70 return SAFE_NO_FOCUS_BORDER; 71 } else { 72 return noFocusBorder; 73 } 74 } 75 76 public Dimension getPreferredSize() { 77 Dimension size; 78 79 if ((this.getText() == null) || (this.getText().equals( "" ))) { 80 setText( " " ); 81 size = super.getPreferredSize(); 82 setText( "" ); 83 } 84 else { 85 size = super.getPreferredSize(); 86 } 87 88 return size; 89 } 90 91 public Component getListCellRendererComponent( 92 JList list, 93 Object value, 94 int index, 95 boolean isSelected, 96 boolean cellHasFocus) 97 { 98 99 /**if (isSelected) { 100 setBackground(UIManager.getColor("ComboBox.selectionBackground")); 101 setForeground(UIManager.getColor("ComboBox.selectionForeground")); 102 } else { 103 setBackground(UIManager.getColor("ComboBox.background")); 104 setForeground(UIManager.getColor("ComboBox.foreground")); 105 }**/ 106 107 if (isSelected) { 108 setBackground(list.getSelectionBackground()); 109 setForeground(list.getSelectionForeground()); 110 } 111 else { 112 setBackground(list.getBackground()); 113 setForeground(list.getForeground()); 114 } 115 116 setFont(list.getFont()); 117 118 if (value instanceof Icon) { 119 setIcon((Icon)value); 120 } 121 else { 122 setText((value == null) ? "" : value.toString()); 123 } 124 return this; 125 } 126 127 128 /** 129 * A subclass of BasicComboBoxRenderer that implements UIResource. 130 * BasicComboBoxRenderer doesn't implement UIResource 131 * directly so that applications can safely override the 132 * cellRenderer property with BasicListCellRenderer subclasses. 133 * <p> 134 * <strong>Warning:</strong> 135 * Serialized objects of this class will not be compatible with 136 * future Swing releases. The current serialization support is 137 * appropriate for short term storage or RMI between applications running 138 * the same version of Swing. As of 1.4, support for long term storage 139 * of all JavaBeans™ 140 * has been added to the <code>java.beans</code> package. 141 * Please see {@link java.beans.XMLEncoder}. 142 */ 143 @SuppressWarnings("serial") // Same-version serialization only 144 public static class UIResource extends BasicComboBoxRenderer implements javax.swing.plaf.UIResource { 145 } 146 }