old-autovect-branch/libjava/classpath/javax/swing/plaf/metal/MetalSeparatorUI.java

   1 /* MetalSeparatorUI.java
   2    Copyright (C) 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.metal;
  40
  41 import java.awt.Color;
  42 import java.awt.Graphics;
  43 import java.awt.Rectangle;
  44
  45 import javax.swing.JComponent;
  46 import javax.swing.JSeparator;
  47 import javax.swing.SwingUtilities;
  48 import javax.swing.UIManager;
  49 import javax.swing.plaf.ComponentUI;
  50 import javax.swing.plaf.basic.BasicSeparatorUI;
  51
  52 /**
  53  * A UI delegate for the {@link JSeparator} component.
  54  */
  55 public class MetalSeparatorUI
  56   extends BasicSeparatorUI
  57 {
  58
  59   // FIXME: maybe replace by a Map of instances when this becomes stateful
  60   /** The shared UI instance for MetalSeparatorUIs */
  61   private static MetalSeparatorUI instance = null;
  62
  63   /**
  64    * Constructs a new instance of <code>MetalSeparatorUI</code>.
  65    */
  66   public MetalSeparatorUI()
  67   {
  68     super();
  69   }
  70
  71   /**
  72    * Returns a shared instance of <code>MetalSeparatorUI</code>.
  73    *
  74    * @param component the component for which we return an UI instance
  75    *
  76    * @return A shared instance of <code>MetalSeparatorUI</code>.
  77    */
  78   public static ComponentUI createUI(JComponent component)
  79   {
  80     if (instance == null)
  81       instance = new MetalSeparatorUI();
  82     return instance;
  83   }
  84
  85   /**
  86    * The separator is made of two lines. The top line will be
  87    * the Metal theme color separatorForeground (or left line if it's vertical).
  88    * The bottom or right line will be the Metal theme color
  89    * separatorBackground.
  90    * The two lines will
  91    * be centered inside the bounds box. If the separator is horizontal,
  92    * then it will be vertically centered, or if it's vertical, it will
  93    * be horizontally centered.
  94    *
  95    * @param g The Graphics object to paint with
  96    * @param c The JComponent to paint.
  97    */
  98   public void paint(Graphics g, JComponent c)
  99   {
 100     Rectangle r = new Rectangle();
 101     SwingUtilities.calculateInnerArea(c, r);
 102     Color saved = g.getColor();
 103     Color c1 = UIManager.getColor("Separator.foreground");
 104     Color c2 = UIManager.getColor("Separator.background");
 105     JSeparator s;
 106     if (c instanceof JSeparator)
 107       s = (JSeparator) c;
 108     else
 109       return;
 110
 111     if (s.getOrientation() == JSeparator.HORIZONTAL)
 112       {
 113         int midAB = r.height / 2;
 114         g.setColor(c1);
 115         g.drawLine(r.x, r.y + midAB - 1, r.x + r.width, r.y + midAB - 1);
 116
 117         g.setColor(c2);
 118         g.fillRect(r.x, r.y + midAB, r.x + r.width, r.y + midAB);
 119       }
 120       else
 121       {
 122         int midAD = r.height / 2 + r.y;
 123         g.setColor(c1);
 124         g.drawLine(r.x, r.y, r.x, r.y + r.height);
 125
 126         g.setColor(c2);
 127         g.fillRect(r.x + midAD, r.y + r.height, r.x + midAD, r.y + r.height);
 128       }
 129     g.setColor(saved);
 130   }
 131 }