/**

  * Copyright 2010 The Kuali Foundation Licensed under the

  * Educational Community 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

  *

  * http://www.osedu.org/licenses/ECL-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.kuali.student.common.ui.client.mvc.events;

 import org.kuali.student.common.ui.client.mvc.ApplicationEvent;

 import org.kuali.student.common.ui.client.mvc.View;

 /**

  * "Checked" event that is fired by the controller when the view is changed

  * 

  * @author Kuali Student Team

  */

 public class ViewChangeEvent extends ApplicationEvent<ViewChangeHandler> {

     public static final Type<ViewChangeHandler> TYPE = new Type<ViewChangeHandler>();

     private final View previousView;

     private final View newView;

     /**

      * This constructs a new ViewChangeEvent

      * 

      * @param previousView

      *            the previously displayed View, or null if this is the first view change

      * @param newView

      *            the new View to be displayed

      */

     public ViewChangeEvent(View previousView, View newView) {

         super();

         this.previousView = previousView;

         this.newView = newView;

     }

     /**

      * Returns the previously displayed view, or null if this is the first view change

      * 

      * @return

      */

     public View getPreviousView() {

         return previousView;

     }

     /**

      * Returns the new View to be displayed

      * 

      * @return

      */

     public View getNewView() {

         return newView;

     }

     @Override

     protected void dispatch(ViewChangeHandler handler) {

         handler.onViewChange(this);

     }

     @Override

     public Type<ViewChangeHandler> getAssociatedType() {

         return TYPE;

     }

 }