/* ComboBoxModel.java --
   Copyright (C) 2002, 2006, Free Software Foundation, Inc.

This file is part of GNU Classpath.

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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();
}