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/* SingleSelectionModel.java --

   Copyright (C) 2002, 2004 Free Software Foundation, Inc.

This file is part of GNU Classpath.

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it under the terms of the GNU General Public License as published by

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permission to link this library with independent modules to produce an

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package javax.swing;

import javax.swing.event.ChangeEvent;

import javax.swing.event.ChangeListener;

/**

 * A data model that is used in components that support at most one

 * selected element, like {@link JTabbedPane}, {@link JMenu} and

 * {@link JPopupMenu}.

 *

 * @author Andrew Selkirk

 */

public interface SingleSelectionModel

{

  /**

   * Returns the selected index or <code>-1</code> if there is no selection.

   *

   * @return The selected index.

   *

   * @see #setSelectedIndex(int)

   */

  int getSelectedIndex();

  /**

   * Sets the selected index and, if this is different to the previous

   * selection, sends a {@link ChangeEvent} to all registered listeners.

   *

   * @param index  the index (use <code>-1</code> to represent no selection).

   *

   * @see #getSelectedIndex()

   * @see #clearSelection

   */

  void setSelectedIndex(int index);

  /**

   * Clears the selection by setting the selected index to <code>-1</code> and

   * sends a {@link ChangeEvent} to all registered listeners.  If the selected

   * index is already <code>-1</code>, this method does nothing.

   */

  void clearSelection();

  /**

   * Returns <code>true</code> if there is a selection, and <code>false</code>

   * otherwise.

   *

   * @return A boolean.

   */

  boolean isSelected();

  /**

   * Registers a listener to receive {@link ChangeEvent} notifications from

   * this model whenever the selected index changes.

   *

   * @param listener the listener to add.

   */

  void addChangeListener(ChangeListener listener);

  /**

   * Deregisters a listener so that it no longer receives {@link ChangeEvent}

   * notifications from this model.

   *

   * @param listener the listener to remove.

   */

  void removeChangeListener(ChangeListener listener);

}