Source for javax.swing.plaf.ComboBoxUI

   1: /* ComboBoxUI.java --
   2:    Copyright (C) 2002, 2003, 2006, 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: package javax.swing.plaf;
  39: 
  40: import javax.swing.JComboBox;
  41: 
  42: /**
  43:  * An abstract base class for delegates that implement the pluggable
  44:  * look and feel for a {@link JComboBox}.
  45:  *
  46:  * @author Andrew Selkirk
  47:  * @author Sascha Brawer (brawer@dandelis.ch)
  48:  */
  49: public abstract class ComboBoxUI extends ComponentUI
  50: {
  51:   /**
  52:    * Constructs a new <code>ComboBoxUI</code>.
  53:    */
  54:   public ComboBoxUI()
  55:   {
  56:     // Nothing to do here.
  57:   }
  58: 
  59:   /**
  60:    * Sets the visibility of the popup button.
  61:    *
  62:    * @param c the <code>JComboBox</code> whose popup
  63:    *        is shown or hidden.
  64:    *
  65:    * @param visible <code>true</code> to show the popup, <code>false</code>
  66:    *        to hide it.
  67:    */
  68:   public abstract void setPopupVisible(JComboBox c, boolean visible);
  69: 
  70:   /**
  71:    * Determines whether the popup button is currently visible.
  72:    *
  73:    * @param c the <code>JComboBox</code> whose popup visibility
  74:    *        is retrieved.
  75:    *
  76:    * @return <code>true</code> if the popup button is currently
  77:    *         visible, <code>false</code> otherwise.
  78:    */
  79:   public abstract boolean isPopupVisible(JComboBox c);
  80: 
  81:   /**
  82:    * Determines whether the combo box can receive input focus.
  83:    *
  84:    * @param c <code>JComboBox</code> whose focus traversability
  85:    *        is to be retrieved.
  86:    *
  87:    * @return <code>true</code> if <code>c</code> can receive
  88:    *          input focus, <code>false</code> otherwise.
  89:    */
  90:   public abstract boolean isFocusTraversable(JComboBox c);
  91: 
  92: }