jfoperationmodifylayers.java

用Java开发的、实现类似Visio功能的应用程序源码

/**
 *    $Id:JFOperationModifyLayers.java $
 *
 *    Copyright 2004 ~ 2005  JingFei International Cooperation LTD. All rights reserved. *
 */
package com.jfimagine.jfgraph.shape.action;


import java.util.List;
import java.util.ArrayList;
import java.util.Iterator;

import com.jfimagine.jfgraph.geom.JFPoint;
import com.jfimagine.jfgraph.shape.base.AbstractObject;
import com.jfimagine.jfgraph.shape.base.AbstractShape;

import com.jfimagine.jfgraph.shape.union.JFPage;
import com.jfimagine.jfgraph.shape.union.CheckItem;

/**
 *  Class JFOperationModifyLayers is used to record a modifyLayers operation.
 */
public class JFOperationModifyLayers extends JFOperation{


	/** old layers' checkitem list*/
	private List m_oldLayers=null;
	
	/** new layers' checkitem list*/
	private List m_newLayers=null;

	/**  
	 *    Constructor.
	 *    @param page A page that used to do opeation.
	 *    @param oldLayers old layers checkitem list.
	 *    @param newLayers new layers checkitem list.
	 */        
        public JFOperationModifyLayers(JFPage page,List oldLayers, List newLayers){
        	m_page	=page;
		setActionId(JFOperation.OPER_MODIFY_LAYERS);
		
		m_oldLayers	=oldLayers;
		m_newLayers	=newLayers;		
	}


	/** undo this operation
	 *  @return new objects selected
	 */
	public List undo(){
		m_page.restoreLayerItemList(m_oldLayers);
		return null;
	}

	/** redo this operation
	 *  @return new objects selected
	 */
	public List redo(){
		m_page.restoreLayerItemList(m_newLayers);
		return null;
	}

}