001    /* BasicTextFieldUI.java
002       Copyright (C) 2004, 2006,  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.basic;
040    
041    import java.awt.Color;
042    import java.beans.PropertyChangeEvent;
043    
044    import javax.swing.JComponent;
045    import javax.swing.UIDefaults;
046    import javax.swing.plaf.ColorUIResource;
047    import javax.swing.plaf.ComponentUI;
048    import javax.swing.text.Element;
049    import javax.swing.text.FieldView;
050    import javax.swing.text.View;
051    
052    public class BasicTextFieldUI extends BasicTextUI
053    {
054      public BasicTextFieldUI()
055      {
056        super();
057      }
058    
059      public View create(Element elem)
060      {
061        return new FieldView(elem);
062      }
063    
064      public static ComponentUI createUI(JComponent c)
065      {
066        return new BasicTextFieldUI();
067      }
068    
069      /**
070       * Returns the prefix for entries in the {@link UIDefaults} table.
071       *
072       * @return "TextField"
073       */
074      protected String getPropertyPrefix()
075      {
076        return "TextField";
077      }
078    
079      public void installUI(JComponent c)
080      {
081        super.installUI(c);
082      }
083    
084      /**
085       * Receives notification whenever one of the text component's bound
086       * properties changes. Here we check for the editable and enabled
087       * properties and adjust the background color accordingly.
088       *
089       * <p>The colors are only changed if they are not a
090       * <code>ColorUIResource</code>.</p>
091       *
092       * @param event the property change event
093       */
094      protected void propertyChange(PropertyChangeEvent event)
095      {
096        if (event.getPropertyName().equals("editable"))
097          {
098            // Changing the color only if the current background is an instance of
099            // ColorUIResource is the behavior of the RI.
100            if (textComponent.getBackground() instanceof ColorUIResource)
101              {
102                Color c = null;
103                Color old = textComponent.getBackground();
104                String prefix = getPropertyPrefix();
105                if (! textComponent.isEnabled())
106                  c = SharedUIDefaults.getColor(prefix + ".disabledBackground");
107                if (c == null && ! textComponent.isEditable())
108                  c = SharedUIDefaults.getColor(prefix + ".inactiveBackground");
109                if (c == null)
110                  c = SharedUIDefaults.getColor(prefix + ".background");
111                if (c != null && c != old)
112                  {
113                    textComponent.setBackground(c);
114                  }
115              }
116          }
117      }
118    }