Source for javax.swing.plaf.basic.BasicComboBoxRenderer

   1: /* BasicComboBoxRenderer.java --
   2:    Copyright (C) 2004  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.basic;
  40: 
  41: import java.awt.Component;
  42: import java.awt.Dimension;
  43: import java.io.Serializable;
  44: 
  45: import javax.swing.JLabel;
  46: import javax.swing.JList;
  47: import javax.swing.ListCellRenderer;
  48: import javax.swing.SwingConstants;
  49: import javax.swing.UIDefaults;
  50: import javax.swing.UIManager;
  51: import javax.swing.border.Border;
  52: import javax.swing.border.EmptyBorder;
  53: 
  54: /**
  55:  * This class is renderer for the combo box. 
  56:  *
  57:  * @author Olga Rodimina
  58:  */
  59: public class BasicComboBoxRenderer extends JLabel implements ListCellRenderer,
  60:                                                              Serializable
  61: {
  62:   /**
  63:    * This border is used whenever renderer doesn't have a focus.
  64:    */
  65:   protected static Border noFocusBorder = new EmptyBorder(0, 0, 0, 0);
  66: 
  67:   /**
  68:    * Creates a new BasicComboBoxRenderer object.
  69:    */
  70:   public BasicComboBoxRenderer()
  71:   {
  72:     setHorizontalAlignment(SwingConstants.LEFT);
  73:   }
  74: 
  75:   /**
  76:    * Returns preferredSize of the renderer
  77:    *
  78:    * @return preferredSize of the renderer
  79:    */
  80:   public Dimension getPreferredSize()
  81:   {
  82:     return super.getPreferredSize();
  83:   }
  84: 
  85:   /**
  86:    * getListCellRendererComponent
  87:    *
  88:    * @param list List of items for which to the background and foreground
  89:    *        colors
  90:    * @param value object that should be rendered in the cell
  91:    * @param index index of the cell in the list of items.
  92:    * @param isSelected draw cell highlighted if isSelected is true
  93:    * @param cellHasFocus draw focus rectangle around cell if the cell has
  94:    *        focus
  95:    *
  96:    * @return Component that will be used to draw the desired cell.
  97:    */
  98:   public Component getListCellRendererComponent(JList list, Object value,
  99:                                                 int index, boolean isSelected,
 100:                                                 boolean cellHasFocus)
 101:   {
 102:     String s = value.toString();
 103:     setText(s);
 104:     setOpaque(true);
 105: 
 106:     UIDefaults defaults = UIManager.getLookAndFeelDefaults();
 107: 
 108:     if (isSelected)
 109:       {
 110:     setBackground(list.getSelectionBackground());
 111:     setForeground(list.getSelectionForeground());
 112:       }
 113:     else
 114:       {
 115:     setBackground(list.getBackground());
 116:     setForeground(list.getForeground());
 117:       }
 118: 
 119:     setEnabled(list.isEnabled());
 120:     setFont(list.getFont());
 121: 
 122:     // Use focusCellHighlightBorder when renderer has focus and 
 123:     // noFocusBorder otherwise
 124:     if (cellHasFocus)
 125:       setBorder(UIManager.getBorder("List.focusCellHighlightBorder"));
 126:     else
 127:       setBorder(noFocusBorder);
 128: 
 129:     return this;
 130:   }
 131: 
 132:   public static class UIResource extends BasicComboBoxRenderer
 133:     implements javax.swing.plaf.UIResource
 134:   {
 135:     /**
 136:      * Creates a new UIResource object.
 137:      */
 138:     public UIResource()
 139:     {
 140:     }
 141:   }
 142: }