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   *   Licensed to the Apache Software Foundation (ASF) under one
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   *  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
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   *
   *    https://www.apache.org/licenses/LICENSE-2.0
   *
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  package org.apache.cayenne.modeler.undo;
  
  import java.awt.event.ItemEvent;
  import java.awt.event.ItemListener;
  
  import javax.swing.JComboBox;
  import javax.swing.undo.UndoManager;
  
  import org.apache.cayenne.modeler.Application;
  
  public class JComboBoxUndoListener implements ItemListener {
  
      private Object deselectedItem;
      private boolean isUserAction = true;
  
      public void itemStateChanged(ItemEvent e) {
          int stateChange = e.getStateChange();
  
          switch (stateChange) {
              case ItemEvent.DESELECTED:
                  deselectedItem = e.getItem();
                  break;
              case ItemEvent.SELECTED:
                  // don't add event to undo list, if it was just the default setting
                  if (isUserAction) {
                      UndoManager undoManager = Application.getInstance().getUndoManager();
                      undoManager.addEdit(new JComboBoxUndoableEdit((JComboBox) e
                              .getSource(), deselectedItem, e.getItem(), this));
                      
                  }
                  //set back to default value after the selecting new option
                  isUserAction = true;
                  break;
  
          }
  
      }
  
      public void setIsUserAction(boolean isUserAction) {
          this.isUserAction = isUserAction;
      }
  }
  