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/* ComboBoxModel.java --
   Copyright (C) 2002, 2006, Free Software Foundation, Inc.
 
This file is part of GNU Classpath.
 
GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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any later version.
 
GNU Classpath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.
 
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along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
 
Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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combination.
 
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
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or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
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exception statement from your version. */
 
package javax.swing;
 
import javax.swing.event.ListDataEvent;
import javax.swing.event.ListDataListener;
 
/**
 * The data model for a {@link JComboBox}. This model keeps track of elements
 * contained in the <code>JComboBox</code> as well as the current
 * combo box selection. Whenever the selection in the <code>JComboBox</code>
 * changes, the <code>ComboBoxModel</code> should fire a {@link ListDataEvent}
 * to the model's {@link ListDataListener}s.
 *
 * @author Andrew Selkirk
 */
public interface ComboBoxModel extends ListModel
{
  /**
   * Sets the selected item in the combo box. Classes implementing this
   * interface should fire a {@link ListDataEvent} to all registered
   * {@link ListDataListener}s to indicate that the selection has changed.
   *
   * @param item  the selected item (<code>null</code> permitted).
   */
  void setSelectedItem(Object item);
 
  /**
   * Returns the currently selected item in the combo box.
   *
   * @return The selected item (possibly <code>null</code>).
   */
  Object getSelectedItem();
}