jfoperationungroup.java

来自「用Java开发的、实现类似Visio功能的应用程序源码」· Java 代码 · 共 165 行

/**
 *    $Id:JFOperationUngroup.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.base.Port;

import com.jfimagine.jfgraph.shape.union.JFPage;
import com.jfimagine.jfgraph.shape.union.JFLayer;
import com.jfimagine.jfgraph.shape.union.JFGroup;

/**
 *  Class JFOperationUngroup is used to record an ungroup shape operation.
 */
public class JFOperationUngroup extends JFOperation{

	/** define an upgroup id object list,
	 *  here we don't use  JFOperation.m_objectIdList, 
	 *  in order to store both id integer objects and id integer list object.
	 *
	 *  for a list objects to be ungrouped, there will be single objects that
	 *  cannot be ungrouped or group objects that can be grouped in it.
	 */
	private List m_ungroupIdList	=new ArrayList();

	

	private static final int   IDTYPE_SINGLE	=1;
	private static final int   IDTYPE_GROUP		=2;
	/** an UngroupId class is used to store single object id or multi-id list*/
	private class UngroupId{
				
		private 	int m_idType	=IDTYPE_SINGLE;
		public int getIdType(){
			return m_idType;
		}
		
		private 	int m_id=0;
		public int getId(){
			return m_id;
		}
		
		private 	List m_idList;
		public List getIdList(){
			return m_idList;
		}
		
		
		public UngroupId(int id){
			m_idType	=IDTYPE_SINGLE;
			m_id		=id;
		}


		public UngroupId(int id, List idList){
			m_idType	=IDTYPE_GROUP;
			m_id		=id;
			m_idList	=idList;
		}
	}


	/**  
	 *    Constructor.
	 *    @param page A page that used to do opeation.
	 *    @param l An object collection to be ungrouped.
	 */        
        public JFOperationUngroup(JFPage page,List l){
        	m_page	=page;
		setActionId(JFOperation.OPER_UNGROUP);
		if (l==null || l.size()==0)
			return;

	
		Iterator it	=l.iterator();

		while (it!=null && it.hasNext()){

			AbstractObject obj	=(AbstractObject)it.next();

			if (!(obj instanceof JFGroup)){
				//simply add the object id to list
				m_ungroupIdList.add(new UngroupId(obj.getObjectId()));
			}else{

				//add sub object id list of group to list
				JFGroup g	=(JFGroup)obj;
				List idList	=getObjectIdList(g.getList().getList());
				m_ungroupIdList.add(new UngroupId(g.getObjectId(),idList));
			}
		}
	}



	/** undo this operation 
	 *  @return new objects selected
	 */
	public List undo(){

		List ret	=new ArrayList();
		
		Iterator it	=m_ungroupIdList.iterator();
		while (it!=null && it.hasNext()){
			UngroupId	gid	=(UngroupId)it.next();
			int id	=gid.getId();
			AbstractObject obj=null;
			
			switch (gid.getIdType()){
				case IDTYPE_SINGLE:
					//do nothing for a single object.
					obj	=getObject(id,false);
					break;
				case IDTYPE_GROUP:
					//re-group for multi-objects within a group.
					List objList	=getObjectList(gid.getIdList());
					obj		=m_page.groupShapes(objList);
					obj.setObjectId(id);
					break;
			}	
			
			if (obj!=null)
				ret.add(obj);
		}
		
		return ret;
	
	}


	/** redo this operation
	 *  @return new objects selected
	 */
	public List redo(){

		List objList	=new ArrayList();
		
		Iterator it	=m_ungroupIdList.iterator();
		while (it!=null && it.hasNext()){
			UngroupId	gid	=(UngroupId)it.next();
			int id		=gid.getId();
			Object obj	=getObject(id,false);
			
			if (obj!=null)
				objList.add(obj);
		}
		
		return m_page.ungroupShapes(objList);

	}


	
}