001 /* DefaultTableCellRenderer.java -- 002 Copyright (C) 2002, 2004, 2005, 2006, Free Software Foundation, Inc. 003 004 This file is part of GNU Classpath. 005 006 GNU Classpath is free software; you can redistribute it and/or modify 007 it under the terms of the GNU General Public License as published by 008 the Free Software Foundation; either version 2, or (at your option) 009 any later version. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 019 02110-1301 USA. 020 021 Linking this library statically or dynamically with other modules is 022 making a combined work based on this library. Thus, the terms and 023 conditions of the GNU General Public License cover the whole 024 combination. 025 026 As a special exception, the copyright holders of this library give you 027 permission to link this library with independent modules to produce an 028 executable, regardless of the license terms of these independent 029 modules, and to copy and distribute the resulting executable under 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 036 exception statement from your version. */ 037 038 039 package javax.swing.table; 040 041 import java.awt.Color; 042 import java.awt.Component; 043 import java.awt.Rectangle; 044 import java.io.Serializable; 045 046 import javax.swing.JLabel; 047 import javax.swing.JTable; 048 import javax.swing.UIManager; 049 import javax.swing.border.Border; 050 import javax.swing.border.EmptyBorder; 051 052 /** 053 * Class to display every cells. 054 */ 055 public class DefaultTableCellRenderer extends JLabel 056 implements TableCellRenderer, Serializable 057 { 058 static final long serialVersionUID = 7878911414715528324L; 059 060 protected static Border noFocusBorder = new EmptyBorder(1, 1, 1, 1); 061 062 public static class UIResource extends DefaultTableCellRenderer 063 implements javax.swing.plaf.UIResource 064 { 065 public UIResource() 066 { 067 super(); 068 } 069 } 070 071 /** 072 * Stores the color set by setForeground(). 073 */ 074 Color foreground; 075 076 /** 077 * Stores the color set by setBackground(). 078 */ 079 Color background; 080 081 /** 082 * Creates a default table cell renderer with an empty border. 083 */ 084 public DefaultTableCellRenderer() 085 { 086 super(); 087 } 088 089 /** 090 * Assign the unselected-foreground. 091 * 092 * @param c the color to assign 093 */ 094 public void setForeground(Color c) 095 { 096 super.setForeground(c); 097 foreground = c; 098 } 099 100 /** 101 * Assign the unselected-background. 102 * 103 * @param c the color to assign 104 */ 105 public void setBackground(Color c) 106 { 107 super.setBackground(c); 108 background = c; 109 } 110 111 /** 112 * Look and feel has changed. 113 * 114 * <p>Replaces the current UI object with the latest version from 115 * the UIManager.</p> 116 */ 117 public void updateUI() 118 { 119 super.updateUI(); 120 background = null; 121 foreground = null; 122 } 123 124 /** 125 * Get the string value of the object and pass it to setText(). 126 * 127 * @param table the JTable 128 * @param value the value of the object. For the text content, 129 * null is rendered as an empty cell. 130 * @param isSelected is the cell selected? 131 * @param hasFocus has the cell the focus? 132 * @param row the row to render 133 * @param column the cell to render 134 * 135 * @return this component (the default table cell renderer) 136 */ 137 public Component getTableCellRendererComponent(JTable table, Object value, 138 boolean isSelected, 139 boolean hasFocus, 140 int row, int column) 141 { 142 setValue(value); 143 setOpaque(true); 144 145 if (table == null) 146 return this; 147 148 if (isSelected) 149 { 150 super.setBackground(table.getSelectionBackground()); 151 super.setForeground(table.getSelectionForeground()); 152 } 153 else 154 { 155 if (background != null) 156 super.setBackground(background); 157 else 158 super.setBackground(table.getBackground()); 159 if (foreground != null) 160 super.setForeground(foreground); 161 else 162 super.setForeground(table.getForeground()); 163 } 164 165 Border b = null; 166 if (hasFocus) 167 { 168 if (isSelected) 169 b = UIManager.getBorder("Table.focusSelectedCellHighlightBorder"); 170 if (b == null) 171 b = UIManager.getBorder("Table.focusCellHighlightBorder"); 172 } 173 else 174 b = noFocusBorder; 175 setBorder(b); 176 177 setFont(table.getFont()); 178 179 // If the current background is equal to the table's background, then we 180 // can avoid filling the background by setting the renderer opaque. 181 Color back = getBackground(); 182 setOpaque(back != null && back.equals(table.getBackground())); 183 184 return this; 185 } 186 187 /** 188 * Overriden for performance. 189 * 190 * <p>This method needs to be overridden in a subclass to actually 191 * do something.</p> 192 * 193 * @return always true 194 */ 195 public boolean isOpaque() 196 { 197 return true; 198 } 199 200 /** 201 * Overriden for performance. 202 * 203 * <p>This method needs to be overridden in a subclass to actually 204 * do something.</p> 205 */ 206 public void validate() 207 { 208 // Does nothing. 209 } 210 211 public void revalidate() 212 { 213 // Does nothing. 214 } 215 216 /** 217 * Overriden for performance. 218 * 219 * <p>This method needs to be overridden in a subclass to actually 220 * do something.</p> 221 */ 222 public void repaint(long tm, int x, int y, int width, int height) 223 { 224 // Does nothing. 225 } 226 227 /** 228 * Overriden for performance. 229 * 230 * <p>This method needs to be overridden in a subclass to actually 231 * do something.</p> 232 */ 233 public void repaint(Rectangle r) 234 { 235 // Does nothing. 236 } 237 238 /** 239 * Overriden for performance. 240 * 241 * <p>This method needs to be overridden in a subclass to actually 242 * do something.</p> 243 */ 244 protected void firePropertyChange(String propertyName, Object oldValue, 245 Object newValue) 246 { 247 // Does nothing. 248 } 249 250 /** 251 * Overriden for performance. 252 * 253 * <p>This method needs to be overridden in a subclass to actually 254 * do something.</p> 255 */ 256 public void firePropertyChange(String propertyName, boolean oldValue, 257 boolean newValue) 258 { 259 // Does nothing. 260 } 261 262 /** 263 * Sets the String for this cell. 264 * 265 * @param value the string value for this cell; if value is null it 266 * sets the text value to an empty string 267 */ 268 protected void setValue(Object value) 269 { 270 if (value != null) 271 setText(value.toString()); 272 else 273 // null is rendered as an empty cell. 274 setText(""); 275 } 276 }