       1 /*
       2  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
       3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
       4  *
       5  * This code is free software; you can redistribute it and/or modify it
       6  * under the terms of the GNU General Public License version 2 only, as
       7  * published by the Free Software Foundation.  Oracle designates this
       8  * particular file as subject to the "Classpath" exception as provided
       9  * by Oracle in the LICENSE file that accompanied this code.
      10  *
      11  * This code is distributed in the hope that it will be useful, but WITHOUT
      12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
      13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      14  * version 2 for more details (a copy is included in the LICENSE file that
      15  * accompanied this code).
      16  *
      17  * You should have received a copy of the GNU General Public License version
      18  * 2 along with this work; if not, write to the Free Software Foundation,
      19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
      20  *
      21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
      22  * or visit www.oracle.com if you need additional information or have any
      23  * questions.
      24  */
      25 package javax.swing;
      26
      27 /**
      28  * A data model for a combo box. This interface extends <code>ListDataModel</code>
      29  * and adds the concept of a <i>selected item</i>. The selected item is generally
      30  * the item which is visible in the combo box display area.
      31  * <p>
      32  * The selected item may not necessarily be managed by the underlying
      33  * <code>ListModel</code>. This disjoint behavior allows for the temporary
      34  * storage and retrieval of a selected item in the model.
      35  *
      36  * @param <E> the type of the elements of this model
      37  *
      38  * @author Arnaud Weber
      39  * @since 1.2
      40  */
      41 public interface ComboBoxModel<E> extends ListModel<E> {
      42
      43   /**
      44    * Set the selected item. The implementation of this  method should notify
      45    * all registered <code>ListDataListener</code>s that the contents
      46    * have changed.
      47    *
      48    * @param <E> the type of the elements of this model.
      49    * @param anItem the list object to select or <code>null</code>
      50    *        to clear the selection
      51    */
      52   void setSelectedItem(E anItem);
      53
      54   /**
      55    * Returns the selected item
      56    * @return The selected item or <code>null</code> if there is no selection
      57    */
      58   E getSelectedItem();
      59 }