content: /*****************************************************************
   *   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 javax.swing.undo.CannotRedoException;
  import javax.swing.undo.CannotUndoException;
  import javax.swing.undo.UndoableEdit;
  
  import org.apache.cayenne.modeler.Application;
  import org.apache.cayenne.modeler.action.RedoAction;
  import org.apache.cayenne.modeler.action.UndoAction;
  import org.apache.cayenne.modeler.util.CayenneAction;
  
  public class CayenneUndoManager extends javax.swing.undo.UndoManager {
  
      private Application application;
  
      public CayenneUndoManager(Application application) {
          this.application = application;
          setLimit(100);
      }
  
      @Override
      public void discardAllEdits() {
          super.discardAllEdits();
          updateUI();
      }
  
      @Override
      public boolean addEdit(UndoableEdit anEdit) {
          boolean result = super.addEdit(anEdit);
          updateUI();
          return result;
      }
  
      @Override
      public void redo() throws CannotRedoException {
          UndoableEdit e = editToBeRedone();
  
          if (e instanceof TextCompoundEdit) {
              TextCompoundEdit edit = (TextCompoundEdit) e;
  
              edit.watchCaretPosition();
  
              super.redo();
  
              edit.stopWatchingCaretPosition();
          } else {
              super.redo();
          }
  
          updateUI();
      }
  
      @Override
      public void undo() throws CannotUndoException {
          UndoableEdit e = editToBeUndone();
  
          if (e instanceof TextCompoundEdit) {
              TextCompoundEdit edit = (TextCompoundEdit) e;
  
              edit.watchCaretPosition();
  
              super.undo();
  
              edit.stopWatchingCaretPosition();
          } else {
              super.undo();
          }
  
          updateUI();
      }
  
      private void updateUI() {
          CayenneAction undoAction = application.getActionManager().getAction(UndoAction.class);
  
          CayenneAction redoAction = application.getActionManager().getAction(RedoAction.class);
  
          undoAction.setEnabled(canUndo());
          redoAction.setEnabled(canRedo());
  
          undoAction.setName(getUndoPresentationName());
          redoAction.setName(getRedoPresentationName());
      }
  }
  