/**

  * Copyright 2009 Timothy Johnston Licensed under the Apache 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.apache.org/licenses/LICENSE-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 com.timjohnstondev.unitconverter.view.listener;

 import java.awt.event.MouseAdapter;

 import java.awt.event.MouseEvent;

 import javax.swing.DefaultListModel;

 import javax.swing.JList;

 import com.timjohnstondev.unitconverter.controller.ModelController;

 /**

  * This listener allows reordering of a {@link JList} that is backed by a {@link DefaultListModel}.

  */

 public class ReorderAdapter extends MouseAdapter

 {

   private ModelController modelController;

   private JList list;

   private int pressIndex;

   private int releaseIndex;

   /**

    * @param newController controller

    * @param listToReorder list

    */

   public ReorderAdapter(final ModelController newController, final JList listToReorder)

   {

     if (!(listToReorder.getModel() instanceof DefaultListModel)) { throw new IllegalArgumentException(

         "List must have a DefaultListModel"); }

     modelController = newController;

     list = listToReorder;

   }

   @Override

   public final void mousePressed(final MouseEvent e)

   {

     pressIndex = list.locationToIndex(e.getPoint());

   }

   @Override

   public final void mouseReleased(final MouseEvent e)

   {

     releaseIndex = list.locationToIndex(e.getPoint());

     if (releaseIndex != pressIndex && releaseIndex != -1)

     {

       reorder();

       setPropertyOrderPreferences();

     }

   }

   @Override

   public final void mouseDragged(final MouseEvent e)

   {

     mouseReleased(e);

     pressIndex = releaseIndex;

   }

   private void reorder()

   {

     final DefaultListModel model = (DefaultListModel) list.getModel();

     final Object dragee = model.elementAt(pressIndex);

     model.removeElementAt(pressIndex);

     model.insertElementAt(dragee, releaseIndex);

   }

   private void setPropertyOrderPreferences()

   {

     modelController.setPropertyOrderPreferences(list);

   }

 }