001 /* BasicSeparatorUI.java -- 002 Copyright (C) 2004 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.plaf.basic; 040 041 import java.awt.Color; 042 import java.awt.Dimension; 043 import java.awt.Graphics; 044 import java.awt.Rectangle; 045 046 import javax.swing.JComponent; 047 import javax.swing.JSeparator; 048 import javax.swing.SwingUtilities; 049 import javax.swing.UIManager; 050 import javax.swing.plaf.ComponentUI; 051 import javax.swing.plaf.SeparatorUI; 052 053 /** 054 * The Basic Look and Feel UI delegate for JSeparator. 055 */ 056 public class BasicSeparatorUI extends SeparatorUI 057 { 058 /** The shadow color. */ 059 protected Color shadow; 060 061 /** The highlight color. */ 062 protected Color highlight; 063 064 /** 065 * Creates a new UI delegate for the given JComponent. 066 * 067 * @param c The JComponent to create a delegate for. 068 * 069 * @return A new BasicSeparatorUI. 070 */ 071 public static ComponentUI createUI(JComponent c) 072 { 073 return new BasicSeparatorUI(); 074 } 075 076 /** 077 * This method installs the UI for the given JComponent. 078 * This can include installing defaults, listeners, and 079 * initializing any instance data. 080 * 081 * @param c The JComponent that is having this UI installed. 082 */ 083 public void installUI(JComponent c) 084 { 085 super.installUI(c); 086 087 if (c instanceof JSeparator) 088 { 089 JSeparator s = (JSeparator) c; 090 091 installDefaults(s); 092 installListeners(s); 093 } 094 } 095 096 /** 097 * Uninstalls the UI for the given JComponent. This 098 * method reverses what was done when installing 099 * the UI on the JComponent. 100 * 101 * @param c The JComponent that is having this UI uninstalled. 102 */ 103 public void uninstallUI(JComponent c) 104 { 105 if (c instanceof JSeparator) 106 { 107 JSeparator s = (JSeparator) c; 108 109 uninstallListeners(s); 110 uninstallDefaults(s); 111 } 112 } 113 114 /** 115 * This method installs the defaults that are given by 116 * the Basic Look and Feel. 117 * 118 * @param s The JSeparator that is being installed. 119 */ 120 protected void installDefaults(JSeparator s) 121 { 122 shadow = UIManager.getColor("Separator.shadow"); 123 highlight = UIManager.getColor("Separator.highlight"); 124 s.setOpaque(false); 125 } 126 127 /** 128 * This method removes the defaults that were given 129 * by the Basic Look and Feel. 130 * 131 * @param s The JSeparator that is being uninstalled. 132 */ 133 protected void uninstallDefaults(JSeparator s) 134 { 135 shadow = null; 136 highlight = null; 137 } 138 139 /** 140 * This method installs any listeners that need 141 * to be attached to the JSeparator or any of its 142 * components. 143 * 144 * @param s The JSeparator that is being installed. 145 */ 146 protected void installListeners(JSeparator s) 147 { 148 // Separators don't receive events. 149 } 150 151 /** 152 * This method uninstalls any listeners that 153 * were installed during the install UI process. 154 * 155 * @param s The JSeparator that is being uninstalled. 156 */ 157 protected void uninstallListeners(JSeparator s) 158 { 159 // Separators don't receive events. 160 } 161 162 /** 163 * The separator is made of two lines. The top line will be 164 * the shadow color (or left line if it's vertical). The bottom 165 * or right line will be the highlight color. The two lines will 166 * be centered inside the bounds box. If the separator is horizontal, 167 * then it will be vertically centered, or if it's vertical, it will 168 * be horizontally centered. 169 * 170 * @param g The Graphics object to paint with 171 * @param c The JComponent to paint. 172 */ 173 public void paint(Graphics g, JComponent c) 174 { 175 Rectangle r = new Rectangle(); 176 SwingUtilities.calculateInnerArea(c, r); 177 Color saved = g.getColor(); 178 179 JSeparator s; 180 if (c instanceof JSeparator) 181 s = (JSeparator) c; 182 else 183 return; 184 185 if (s.getOrientation() == JSeparator.HORIZONTAL) 186 { 187 int midAB = r.height / 2; 188 g.setColor(shadow); 189 g.drawLine(r.x, r.y + midAB - 1, r.x + r.width, r.y + midAB - 1); 190 191 g.setColor(highlight); 192 g.fillRect(r.x, r.y + midAB, r.x + r.width, r.y + midAB); 193 } 194 else 195 { 196 int midAD = r.height / 2 + r.y; 197 g.setColor(shadow); 198 g.drawLine(r.x, r.y, r.x, r.y + r.height); 199 200 g.setColor(highlight); 201 g.fillRect(r.x + midAD, r.y + r.height, r.x + midAD, r.y + r.height); 202 } 203 g.setColor(saved); 204 } 205 206 /** 207 * This method returns the preferred size of the 208 * JComponent. 209 * 210 * @param c The JComponent to measure. 211 * 212 * @return The preferred size. 213 */ 214 public Dimension getPreferredSize(JComponent c) 215 { 216 Dimension pref = new Dimension(2, 0); 217 if (c instanceof JSeparator) 218 { 219 JSeparator s = (JSeparator) c; 220 if (s.getOrientation() == JSeparator.HORIZONTAL) 221 pref = new Dimension(0, 2); 222 } 223 return pref; 224 } 225 226 /** 227 * This method returns the minimum size of the 228 * JComponent. 229 * 230 * @param c The JComponent to measure. 231 * 232 * @return The minimum size. 233 */ 234 public Dimension getMinimumSize(JComponent c) 235 { 236 return new Dimension(0, 0); 237 } 238 239 /** 240 * This method returns the maximum size of the 241 * JComponent. 242 * 243 * @param c The JComponent to measure. 244 * 245 * @return The maximum size. 246 */ 247 public Dimension getMaximumSize(JComponent c) 248 { 249 return new Dimension(Short.MAX_VALUE, 250 Short.MAX_VALUE); 251 } 252 }