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   *   Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
   *  with the License.  You may obtain a copy of the License at
   *
   *    https://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
   *  software distributed under the License is distributed on an
   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   *  KIND, either express or implied.  See the License for the
   *  specific language governing permissions and limitations
   *  under the License.
   ****************************************************************/
  package org.apache.cayenne.modeler.undo;
  
  import java.awt.event.ItemListener;
  
  import javax.swing.JComboBox;
  import javax.swing.undo.AbstractUndoableEdit;
  import javax.swing.undo.CannotRedoException;
  import javax.swing.undo.CannotUndoException;
  
  public class JComboBoxUndoableEdit extends AbstractUndoableEdit {
  
      
      
      private JComboBox comboBox;
      private Object deselectedItem;
      private Object selectedItem;
      private ItemListener undoItemListener;
      
      public JComboBoxUndoableEdit(JComboBox comboBox, Object deselectedItem,
              Object selectedItem, ItemListener undoItemListener) {
          super();
          this.comboBox = comboBox;
          this.deselectedItem = deselectedItem;
          this.selectedItem = selectedItem;
          this.undoItemListener = undoItemListener;
      }
      
      @Override
      public String getPresentationName() {
          return "Selection";
      }
  
      @Override
      public boolean canRedo() {
          return true;
      }
  
      @Override
      public void redo() throws CannotRedoException {
          comboBox.removeItemListener(undoItemListener);
  
          try {
              comboBox.setSelectedItem(selectedItem);
          }
          finally {
             comboBox.addItemListener(undoItemListener);
          }
      }
  
      @Override
      public void undo() throws CannotUndoException {
          comboBox.removeItemListener(undoItemListener);
          try {
              comboBox.setSelectedItem(deselectedItem);
          }
          finally {
              comboBox.addItemListener(undoItemListener);
          }
      }
  }
  