/**

  * 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.widgets.progress;

 import java.util.LinkedList;

 import org.kuali.student.common.ui.client.widgets.KSLightBox;

 import com.google.gwt.user.client.ui.HorizontalPanel;

 import com.google.gwt.user.client.ui.Image;

 import com.google.gwt.user.client.ui.Label;

 import com.google.gwt.user.client.ui.VerticalPanel;

 /**

  * This class handles a static list of BlockingTasks, when a blocking task is added to the list, the blocking

  * progress indicator is shown to the user and the user can perform no action until all blocking tasks are finished/removed.

  *

  * @author Bsmith

  *

  */

 public class KSBlockingProgressIndicator{

     private static LinkedList<BlockingTask> tasks = new LinkedList<BlockingTask>();

         private static final VerticalPanel mainPanel = new VerticalPanel();

         private static final VerticalPanel listPanel = new VerticalPanel();

         private static KSLightBox popupIndicator;

         private static boolean initialized = false;

     private static int width = 200;

     private static int height = 30;

         /**

          * Initializes the blocking progress indicator.  This must be called before

          * blocking task are added.

          *

          */

         public static void initialize(){

                 mainPanel.add(listPanel);

                 //popupIndicator = new KSLightBox(false);

                 popupIndicator = new KSLightBox(false);

                 //popupIndicator.setShowCloseLink(false);

                 popupIndicator.setWidget(mainPanel);

                 popupIndicator.setSize(200, 30);

                 popupIndicator.setGlassStyleName("KS-Blocking-Glass");

                 popupIndicator.showButtons(false);

                 setupDefaultStyle();

                 initialized = true;

         }

         /**

          * Adds a blocking task to the queue.  When all tasks are removed, the indicator

          * is no longer shown.

          *

          * @param task the task description to be added

          */

         public static void addTask(BlockingTask task) {

                 tasks.add(task);

                 updateIndicator();

         }

         /**

          * Removes the blocking task from the queue

          *

          * @param task the task to be removed from the blocking task queue

          */

         public static void removeTask(BlockingTask task) {

                 tasks.remove(task);

                 if (tasks.isEmpty()) {

                         hideIndicator();

                 } else {

                         updateIndicator();

                 }

         }

     public static void setSize(final int w, final int h) {

      width = w;

      height = h;

     }

         private static void updateIndicator() {

                 listPanel.clear();

                 BlockingTask task = tasks.getLast();

                 HorizontalPanel taskPanel = new HorizontalPanel();

             Image Image = new Image("images/common/twiddler3.gif");

                 taskPanel.add(Image);

                 taskPanel.add(new Label(task.getDescription()));

                 listPanel.add(taskPanel);

         showIndicator();                

         }

         private static void showIndicator(){

                 if(!initialized){

                         initialize();

                 }

                 popupIndicator.setSize(width, height);

                 popupIndicator.show();

         }

         private static void hideIndicator() {

                 popupIndicator.hide();

         }

         private static  void setupDefaultStyle(){

                 listPanel.addStyleName("KS-Blocking-Task-List");

                 mainPanel.addStyleName("KS-Blocking-Task-Main");

                 mainPanel.addStyleName("KS-Mouse-Normal");

         }

 }