jfoperationmodifytext.java

用Java开发的、实现类似Visio功能的应用程序源码

/**
 *    $Id:JFOperationModifyText.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 java.util.Comparator;
import java.util.Collections;

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.base.ObjectList;

import com.jfimagine.jfgraph.shape.union.JFPage;
import com.jfimagine.jfgraph.shape.union.JFLayer;
import com.jfimagine.jfgraph.shape.base.Label;



/**
 *  Class JFOperationModifyText is used to record a modify text operation.
 */
public class JFOperationModifyText extends JFOperation{


	/** object id of the object to be changed text.
	 */
	private int m_objectId	=0;
	
	/** old text of this object */
	private  String m_oldText	="";
	/** new text of this object */
	private  String m_newText	="";

	/**  
	 *    Constructor.
	 *    @param page A page that used to do opeation.
	 *    @param obj An object that to be changed text.
	 *    @param oldText Last text assigned.
	 *    @param newText A new text assigned.
	 */        
        public JFOperationModifyText(JFPage page,AbstractObject obj,String oldText,String newText){
        	m_page	=page;
		setActionId(JFOperation.OPER_MODIFY_TEXT);
		if (obj==null)  return;
		
		AbstractShape aShape	=(AbstractShape)obj;
		m_objectId	=aShape.getObjectId();
		m_oldText	=oldText;
		m_newText	=newText;
	}


	/** undo this operation 
	 *  @return new objects selected
	 */
	public List undo(){
		List ret	=new ArrayList();
		AbstractObject obj=getObject(m_objectId,false);
		if (obj!=null){
			AbstractShape aShape	=(AbstractShape)obj;
			aShape.getLabel().setText(m_oldText);
			ret.add(obj);
		}
		
		return ret;
	}


	/** redo this operation
	 *  @return new objects selected
	 */
	public List redo(){
		List ret	=new ArrayList();
		AbstractObject obj=getObject(m_objectId,false);
		if (obj!=null){
			AbstractShape aShape	=(AbstractShape)obj;
			aShape.getLabel().setText(m_newText);
			ret.add(obj);
		}
		
		return ret;
	}


	
}