Source for javax.swing.plaf.metal.MetalSeparatorUI

   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;
  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: }