gomp-20050608-branch/libjava/classpath/javax/swing/plaf/basic/BasicSeparatorUI.java

   1 /* BasicSeparatorUI.java --
   2    Copyright (C) 2004 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.Color;
  42 import java.awt.Dimension;
  43 import java.awt.Graphics;
  44 import java.awt.Rectangle;
  45
  46 import javax.swing.JComponent;
  47 import javax.swing.JSeparator;
  48 import javax.swing.SwingUtilities;
  49 import javax.swing.UIManager;
  50 import javax.swing.plaf.ComponentUI;
  51 import javax.swing.plaf.SeparatorUI;
  52
  53 /**
  54  * The Basic Look and Feel UI delegate for JSeparator.
  55  */
  56 public class BasicSeparatorUI extends SeparatorUI
  57 {
  58   /** The shadow color. */
  59   protected Color shadow;
  60
  61   /** The highlight color. */
  62   protected Color highlight;
  63
  64   /**
  65    * Creates a new UI delegate for the given JComponent.
  66    *
  67    * @param c The JComponent to create a delegate for.
  68    *
  69    * @return A new BasicSeparatorUI.
  70    */
  71   public static ComponentUI createUI(JComponent c)
  72   {
  73     return new BasicSeparatorUI();
  74   }
  75
  76   /**
  77    * This method installs the UI for the given JComponent.
  78    * This can include installing defaults, listeners, and
  79    * initializing any instance data.
  80    *
  81    * @param c The JComponent that is having this UI installed.
  82    */
  83   public void installUI(JComponent c)
  84   {
  85     super.installUI(c);
  86
  87     if (c instanceof JSeparator)
  88       {
  89         JSeparator s = (JSeparator) c;
  90
  91         installDefaults(s);
  92         installListeners(s);
  93       }
  94   }
  95
  96   /**
  97    * Uninstalls the UI for the given JComponent. This
  98    * method reverses what was done when installing
  99    * 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 }