org.eclipse.osee.ats/src/org/eclipse/osee/ats/workflow/editor/model/commands/ShapeSetConstraintCommand.java

/*******************************************************************************
 * Copyright (c) 2004, 2005 Donald G. Dunne and others.
 * 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:
 *    Donald G. Dunne - initial API and implementation
 *******************************************************************************/
package org.eclipse.osee.ats.workflow.editor.model.commands;

import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.gef.RequestConstants;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.requests.ChangeBoundsRequest;
import org.eclipse.osee.ats.workflow.editor.model.Shape;

/**
 * A command to resize and/or move a shape. The command can be undone or redone.
 * 
 * @author Donald G. Dunne
 */
public class ShapeSetConstraintCommand extends Command {
   /** Stores the new size and location. */
   private final Rectangle newBounds;
   /** Stores the old size and location. */
   private Rectangle oldBounds;
   /** A request to move/resize an edit part. */
   private final ChangeBoundsRequest request;

   /** Shape to manipulate. */
   private final Shape shape;

   /**
    * Create a command that can resize and/or move a shape.
    * 
    * @param shape the shape to manipulate
    * @param req the move and resize request
    * @param newBounds the new size and location
    * @throws IllegalArgumentException if any of the parameters is null
    */
   public ShapeSetConstraintCommand(Shape shape, ChangeBoundsRequest req, Rectangle newBounds) {
      if (shape == null || req == null || newBounds == null) {
         throw new IllegalArgumentException();
      }
      this.shape = shape;
      this.request = req;
      this.newBounds = newBounds.getCopy();
      setLabel("move / resize");
   }

   /* (non-Javadoc)
    * @see org.eclipse.gef.commands.Command#canExecute()
    */
   @Override
   public boolean canExecute() {
      Object type = request.getType();
      // make sure the Request is of a type we support:
      return (RequestConstants.REQ_MOVE.equals(type) || RequestConstants.REQ_MOVE_CHILDREN.equals(type) || RequestConstants.REQ_RESIZE.equals(type) || RequestConstants.REQ_RESIZE_CHILDREN.equals(type));
   }

   /* (non-Javadoc)
    * @see org.eclipse.gef.commands.Command#execute()
    */
   @Override
   public void execute() {
      oldBounds = new Rectangle(shape.getLocation(), shape.getSize());
      redo();
   }

   /* (non-Javadoc)
    * @see org.eclipse.gef.commands.Command#redo()
    */
   @Override
   public void redo() {
      shape.setSize(newBounds.getSize());
      shape.setLocation(newBounds.getLocation());
   }

   /* (non-Javadoc)
    * @see org.eclipse.gef.commands.Command#undo()
    */
   @Override
   public void undo() {
      shape.setSize(oldBounds.getSize());
      shape.setLocation(oldBounds.getLocation());
   }
}