package org.jtheque.core.managers.undo;

 /*

  * This file is part of JTheque.

  *

  * JTheque is free software: you can redistribute it and/or modify

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

  * the Free Software Foundation, either version 3 of the License.

  *

  * JTheque is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License

  * along with JTheque.  If not, see <http://www.gnu.org/licenses/>.

  */

 import org.jtheque.core.managers.ManagerException;

 import org.jtheque.core.managers.Managers;

 import org.jtheque.core.managers.log.ILoggingManager;

 import javax.swing.Action;

 import javax.swing.undo.CannotUndoException;

 import javax.swing.undo.UndoManager;

 import javax.swing.undo.UndoableEdit;

 /**

  * An undo-redo manager implementation.

  *

  * @author Baptiste Wicht

  */

 public final class UndoRedoManager extends UndoManager implements IUndoRedoManager {

     private Action undoAction;

     private Action redoAction;

     private boolean enabled = true;

     @Override

     public void preInit() {

         //Nothing to do

     }

     @Override

     public void close(){

         //Nothing to do

     }

     @Override

     public void init() throws ManagerException {

         stateChanged();

     }

     @Override

     public boolean isEnabled() {

         return enabled;

     }

     @Override

     public void setEnabled(boolean enabled) {

         this.enabled = enabled;

     }

     @Override

     public synchronized boolean addEdit(UndoableEdit arg0) {

         boolean add = super.addEdit(arg0);

         stateChanged();

         return add;

     }

     @Override

     public void setUndoAction(Action undoAction){

         this.undoAction = undoAction;

     }

     @Override

     public void setRedoAction(Action redoAction){

         this.redoAction = redoAction;

     }

     @Override

     public synchronized void undo() {

         try {

             super.undo();

         } catch (CannotUndoException e) {

             Managers.getManager(ILoggingManager.class).getLogger(getClass()).error(e);

         } finally {

             stateChanged();

         }

     }

     @Override

     public synchronized void redo() {

         try {

             super.redo();

         } catch (CannotUndoException e) {

             Managers.getManager(ILoggingManager.class).getLogger(getClass()).error(e);

         } finally {

             stateChanged();

         }

     }

     /**

      * Update the state of the undo/redo action.

      */

     private void stateChanged() {

         undoAction.putValue(Action.NAME, getUndoPresentationName());

         redoAction.putValue(Action.NAME, getRedoPresentationName());

         undoAction.setEnabled(canUndo());

         redoAction.setEnabled(canRedo());

     }

 }