1 /* BasicComboBoxRenderer.java -- 2 Copyright (C) 2004, 2005 Free Software Foundation, Inc. 3 4 This file is part of GNU Classpath. 5 6 GNU Classpath is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GNU Classpath is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GNU Classpath; see the file COPYING. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301 USA. 20 21 Linking this library statically or dynamically with other modules is 22 making a combined work based on this library. Thus, the terms and 23 conditions of the GNU General Public License cover the whole 24 combination. 25 26 As a special exception, the copyright holders of this library give you 27 permission to link this library with independent modules to produce an 28 executable, regardless of the license terms of these independent 29 modules, and to copy and distribute the resulting executable under 30 terms of your choice, provided that you also meet, for each linked 31 independent module, the terms and conditions of the license of that 32 module. An independent module is a module which is not derived from 33 or based on this library. If you modify this library, you may extend 34 this exception to your version of the library, but you are not 35 obligated to do so. If you do not wish to do so, delete this 36 exception statement from your version. */ 37 38 39 package javax.swing.plaf.basic; 40 41 import java.awt.Component; 42 import java.awt.Dimension; 43 import java.awt.FontMetrics; 44 import java.io.Serializable; 45 46 import javax.swing.JComboBox; 47 import javax.swing.JLabel; 48 import javax.swing.JList; 49 import javax.swing.ListCellRenderer; 50 import javax.swing.SwingConstants; 51 import javax.swing.SwingUtilities; 52 import javax.swing.border.Border; 53 import javax.swing.border.EmptyBorder; 54 55 /** 56 * A renderer for a {@link JComboBox}. 57 * 58 * @author Olga Rodimina 59 */ 60 public class BasicComboBoxRenderer 61 extends JLabel 62 implements ListCellRenderer, Serializable 63 { 64 /** 65 * A shared border instance for all renderers. 66 */ 67 protected static Border noFocusBorder = new EmptyBorder(0, 0, 0, 0); 68 69 /** 70 * Creates a new <code>BasicComboBoxRenderer</code> object. 71 */ BasicComboBoxRenderer()72 public BasicComboBoxRenderer() 73 { 74 setHorizontalAlignment(SwingConstants.LEFT); 75 setBorder(noFocusBorder); 76 } 77 78 /** 79 * Returns preferredSize of the renderer 80 * 81 * @return preferredSize of the renderer 82 */ getPreferredSize()83 public Dimension getPreferredSize() 84 { 85 return super.getPreferredSize(); 86 } 87 88 /** 89 * Returns a component that has been configured to display the given 90 * <code>value</code>. 91 * 92 * @param list List of items for which to the background and foreground 93 * colors 94 * @param value object that should be rendered in the cell 95 * @param index index of the cell in the list of items. 96 * @param isSelected draw cell highlighted if isSelected is true 97 * @param cellHasFocus draw focus rectangle around cell if the cell has 98 * focus 99 * 100 * @return Component that will be used to draw the desired cell. 101 */ getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus)102 public Component getListCellRendererComponent(JList list, Object value, 103 int index, boolean isSelected, 104 boolean cellHasFocus) 105 { 106 String s = value.toString(); 107 108 // String maybe larger than comboBox. 109 FontMetrics fm = getToolkit().getFontMetrics(list.getFont()); 110 int strWidth = SwingUtilities.computeStringWidth(fm, s); 111 int cbWidth = getSize().width; 112 if (cbWidth != 0 && strWidth > cbWidth) 113 { 114 char[] str = s.toCharArray(); 115 int currWidth = 0; 116 int i = 0; 117 String postStr = "... "; 118 cbWidth -= SwingUtilities.computeStringWidth(fm, postStr); 119 while (i < str.length && currWidth < cbWidth) 120 { 121 ++i; 122 currWidth = SwingUtilities.computeStringWidth(fm, new String(str, 0, i)); 123 } 124 setText(new String(str, 0, i) + postStr); 125 } 126 else 127 setText(s); 128 129 setOpaque(true); 130 131 if (isSelected || cellHasFocus) 132 { 133 setBackground(list.getSelectionBackground()); 134 setForeground(list.getSelectionForeground()); 135 } 136 else 137 { 138 setBackground(list.getBackground()); 139 setForeground(list.getForeground()); 140 } 141 142 setEnabled(list.isEnabled()); 143 setFont(list.getFont()); 144 return this; 145 } 146 147 /** 148 * A subclass of {@link BasicComboBoxRenderer} that implements the 149 * {@link javax.swing.plaf.UIResource} interface. 150 */ 151 public static class UIResource extends BasicComboBoxRenderer 152 implements javax.swing.plaf.UIResource 153 { 154 /** 155 * Creates a new <code>UIResource</code> object. 156 */ UIResource()157 public UIResource() 158 { 159 // Nothing to do here. 160 } 161 } 162 } 163