/*
 * Licensed Materials - Property of Rogue Wave Software, Inc. 
 * © Copyright Rogue Wave Software, Inc. 2014, 2017 
 * © Copyright IBM Corp. 2009, 2014
 * © Copyright ILOG 1996, 2009
 * All Rights Reserved.
 *
 * Note to U.S. Government Users Restricted Rights:
 * The Software and Documentation were developed at private expense and
 * are "Commercial Items" as that term is defined at 48 CFR 2.101,
 * consisting of "Commercial Computer Software" and
 * "Commercial Computer Software Documentation", as such terms are
 * used in 48 CFR 12.212 or 48 CFR 227.7202-1 through 227.7202-4,
 * as applicable.
 */

package dnd;

import java.io.*;
import ilog.views.*;
import ilog.views.io.*;

/**
 * The <code>DeltaProperty</code> class allows you to associate
 * with an <code>IlvGraphic</code> the position of the mouse pointer inside it.
 * It is useful to remember this position during drag-and-drop operations.
 * @see DragAdapter
 * @see DropAdapter
 */
public class DeltaProperty extends IlvNamedProperty 
{ 
  private IlvPoint value;
  
  public static String NAME = "DELTA";

  public DeltaProperty(IlvInputStream stream) throws IlvReadFileException
  {
    super(stream);
    this.value = stream.readPoint("value");
  } 

  public DeltaProperty(IlvPoint delta)
  {
    super(NAME);
    value = delta;
  }

  public DeltaProperty(DeltaProperty source)
  {
    super(source);
    this.value = source.value;
  }

  Override
  public IlvNamedProperty copy()
  {
    return new DeltaProperty(this);
  }

  Override
  public boolean isPersistent()
  {
    return true;
  }

  Override
  public void write(IlvOutputStream stream) throws IOException
  {
    super.write(stream);
    stream.write("value", value);
  }

  public IlvPoint getDelta() 
  {
    return value;
  }
}