Source for javax.swing.plaf.metal.MetalRootPaneUI

   1: /* MetalRootPaneUI.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 javax.swing.JComponent;
  42: import javax.swing.JRootPane;
  43: import javax.swing.plaf.ComponentUI;
  44: import javax.swing.plaf.basic.BasicRootPaneUI;
  45: 
  46: /**
  47:  * A UI delegate for the {@link JRootPane} component.  This class is not fully
  48:  * implemented.
  49:  * 
  50:  * @since 1.4
  51:  */
  52: public class MetalRootPaneUI
  53:   extends BasicRootPaneUI
  54: {
  55: 
  56:   // FIXME: maybe replace by a Map of instances when this becomes stateful
  57:   /** The shared UI instance for MetalRootPaneUIs */
  58:   private static MetalRootPaneUI instance = null;
  59: 
  60:   /**
  61:    * Constructs a shared instance of <code>MetalRootPaneUI</code>.
  62:    */
  63:   public MetalRootPaneUI()
  64:   {
  65:     super();
  66:   }
  67: 
  68:   /**
  69:    * Returns a shared instance of <code>MetalRootPaneUI</code>.
  70:    *
  71:    * @param component the component for which we return an UI instance
  72:    *
  73:    * @return A shared instance of <code>MetalRootPaneUI</code>.
  74:    */
  75:   public static ComponentUI createUI(JComponent component)
  76:   {
  77:     if (instance == null)
  78:       instance = new MetalRootPaneUI();
  79:     return instance;
  80:   }
  81: }