001    /* MetalSeparatorUI.java
002       Copyright (C) 2005 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.metal;
040    
041    import java.awt.Color;
042    import java.awt.Graphics;
043    import java.awt.Rectangle;
044    
045    import javax.swing.JComponent;
046    import javax.swing.JSeparator;
047    import javax.swing.SwingUtilities;
048    import javax.swing.UIManager;
049    import javax.swing.plaf.ComponentUI;
050    import javax.swing.plaf.basic.BasicSeparatorUI;
051    
052    /**
053     * A UI delegate for the {@link JSeparator} component.
054     */
055    public class MetalSeparatorUI
056      extends BasicSeparatorUI
057    {
058    
059      // FIXME: maybe replace by a Map of instances when this becomes stateful
060      /** The shared UI instance for MetalSeparatorUIs */
061      private static MetalSeparatorUI instance;
062    
063      /**
064       * Constructs a new instance of <code>MetalSeparatorUI</code>.
065       */
066      public MetalSeparatorUI()
067      {
068        super();
069      }
070    
071      /**
072       * Returns a shared instance of <code>MetalSeparatorUI</code>.
073       *
074       * @param component the component for which we return an UI instance
075       *
076       * @return A shared instance of <code>MetalSeparatorUI</code>.
077       */
078      public static ComponentUI createUI(JComponent component)
079      {
080        if (instance == null)
081          instance = new MetalSeparatorUI();
082        return instance;
083      }
084    
085      /**
086       * The separator is made of two lines. The top line will be 
087       * the Metal theme color separatorForeground (or left line if it's vertical).
088       * The bottom or right line will be the Metal theme color
089       * separatorBackground.
090       * The two lines will 
091       * be centered inside the bounds box. If the separator is horizontal, 
092       * then it will be vertically centered, or if it's vertical, it will 
093       * be horizontally centered.
094       *
095       * @param g The Graphics object to paint with
096       * @param c The JComponent to paint.
097       */
098      public void paint(Graphics g, JComponent c)
099      {
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    }