001/* MetalCheckBoxUI.java
002   Copyright (C) 2005 Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038
039package javax.swing.plaf.metal;
040
041import javax.swing.JCheckBox;
042import javax.swing.JComponent;
043import javax.swing.UIDefaults;
044import javax.swing.plaf.ComponentUI;
045
046/**
047 * A UI delegate for the {@link JCheckBox} component.
048 */
049public 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}