001    /* MetalCheckBoxUI.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 javax.swing.JCheckBox;
042    import javax.swing.JComponent;
043    import javax.swing.UIDefaults;
044    import javax.swing.plaf.ComponentUI;
045    
046    /**
047     * A UI delegate for the {@link JCheckBox} component.
048     */
049    public class MetalCheckBoxUI
050      extends MetalRadioButtonUI
051    {
052    
053      // FIXME: maybe replace by a Map of instances when this becomes stateful
054      /** The shared UI instance for JCheckBoxes. */
055      private static MetalCheckBoxUI instance;
056    
057      /**
058       * Constructs a new instance of MetalCheckBoxUI.
059       */
060      public MetalCheckBoxUI()
061      {
062        super();
063      }
064    
065      /**
066       * Returns a shared instance of <code>MetalCheckBoxUI</code>.
067       *
068       * @param component the component for which we return an UI instance
069       *
070       * @return A shared instance of <code>MetalCheckBoxUI</code>.
071       */
072      public static ComponentUI createUI(JComponent component)
073      {
074        if (instance == null)
075          instance = new MetalCheckBoxUI();
076        return instance;
077      }
078      
079      /**
080       * Returns the prefix for properties defined in the {@link UIDefaults} table.
081       * 
082       * @return The property prefix (<code>"CheckBox."</code>).
083       */
084      public String getPropertyPrefix()
085      {
086        return "CheckBox.";
087      }
088    }
089