/* $Id: ActionLayout.java 17881 2010-01-12 21:09:28Z linus $

  *****************************************************************************

  * Copyright (c) 2009 Contributors - see below

  * All rights reserved. This program and the accompanying materials

  * are made available under the terms of the Eclipse Public License v1.0

  * which accompanies this distribution, and is available at

  * http://www.eclipse.org/legal/epl-v10.html

  *

  * Contributors:

  *    tfmorris

  *****************************************************************************

  *

  * Some portions of this file was previously release using the BSD License:

  */

 // Copyright (c) 1996,2009 The Regents of the University of California. All

 // Rights Reserved. Permission to use, copy, modify, and distribute this

 // software and its documentation without fee, and without a written

 // agreement is hereby granted, provided that the above copyright notice

 // and this paragraph appear in all copies.  This software program and

 // documentation are copyrighted by The Regents of the University of

 // California. The software program and documentation are supplied "AS

 // IS", without any accompanying services from The Regents. The Regents

 // does not warrant that the operation of the program will be

 // uninterrupted or error-free. The end-user understands that the program

 // was developed for research purposes and is advised not to rely

 // exclusively on the program for any reason.  IN NO EVENT SHALL THE

 // UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,

 // SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS,

 // ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF

 // THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF

 // SUCH DAMAGE. THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY

 // WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

 // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE

 // PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF

 // CALIFORNIA HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT,

 // UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

 package org.argouml.uml.ui;

 import java.awt.event.ActionEvent;

 import javax.swing.Action;

 import org.argouml.i18n.Translator;

 import org.argouml.ui.UndoableAction;

 import org.argouml.ui.targetmanager.TargetManager;

 import org.argouml.uml.diagram.ArgoDiagram;

 import org.argouml.uml.diagram.DiagramUtils;

 import org.argouml.uml.diagram.activity.layout.ActivityDiagramLayouter;

 import org.argouml.uml.diagram.activity.ui.UMLActivityDiagram;

 import org.argouml.uml.diagram.layout.Layouter;

 import org.argouml.uml.diagram.static_structure.layout.ClassdiagramLayouter;

 import org.argouml.uml.diagram.static_structure.ui.UMLClassDiagram;

 /**

  * Action to automatically lay out a diagram.

  *

  */

 public class ActionLayout extends UndoableAction {

     /**

      * The constructor.

      */

     public ActionLayout() {

         super(Translator.localize("action.layout"), null);

         // Set the tooltip string:

         putValue(Action.SHORT_DESCRIPTION, 

                 Translator.localize("action.layout"));

     }

     /**

      * Check whether we deal with a supported diagram type (currently only Class

      * and Activity diagrams).

      * <p>

      * NOTE: This is only called at initialization time by Swing, so the 

      * application is responsible for checking when the current diagram changes.

      * Currently done in 

      * {@link org.argouml.ui.cmd.GenericArgoMenuBar#setTarget()}.

      * 

      * @return true if the action is enabled

      */

     @Override

     public boolean isEnabled() {

         ArgoDiagram d;

         Object target = TargetManager.getInstance().getTarget();

         if (target instanceof ArgoDiagram) {

             d = (ArgoDiagram) target;

         } else {

             d = DiagramUtils.getActiveDiagram(); 

         }

         if (d instanceof UMLClassDiagram 

                 || d instanceof UMLActivityDiagram) {

             return true;

         }

         return false;

     }

     /*

      * This action performs the layout and triggers a redraw of the editor pane.

      * 

      * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)

      */

     @Override

     public void actionPerformed(ActionEvent ae) {

             super.actionPerformed(ae);

         ArgoDiagram diagram = DiagramUtils.getActiveDiagram();

         Layouter layouter;

         if (diagram instanceof UMLClassDiagram) {

             layouter = new ClassdiagramLayouter(diagram);

         } else if (diagram instanceof UMLActivityDiagram) {

             layouter = 

                  new ActivityDiagramLayouter(diagram);

         } else {

             return;

         }

         // Rearrange the diagram layout

         layouter.layout();

         diagram.damage();

     }

 }