groupcommand.java

对eclipse gef进行封装,可以生成图形化编辑器

/*******************************************************************************
 * $Header: /cvsroot/EOS6/work_dir/niegy/com.primeton.studio.gef.ui/src/com/primeton/studio/gef/ui/commands/GroupCommand.java,v 1.2 2006/12/30 02:45:04 niegy Exp $
 * $Revision: 1.2 $
 * $Date: 2006/12/30 02:45:04 $
 *
 *==============================================================================
 *
 * Copyright (c) 2001-2006 Primeton Technologies, Ltd.
 * All rights reserved.
 * 
 * Created on 2006-12-6
 *******************************************************************************/


package com.primeton.studio.gef.ui.commands;

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

import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.gef.commands.Command;

import com.primeton.studio.gef.core.Node;
import com.primeton.studio.gef.core.CoreFactory;
import com.primeton.studio.gef.core.GroupNode;
import com.primeton.studio.gef.core.Location;
import com.primeton.studio.gef.core.NodeElement;
import com.primeton.studio.gef.core.Size;

/**
 * 组合节点命令
 *
 * @author niegy (mailto:[e-mail])
 */
/*
 * 修改历史
 * $Log: GroupCommand.java,v $
 * Revision 1.2  2006/12/30 02:45:04  niegy
 * 重构代码
 *
 * Revision 1.1  2006/12/08 07:04:32  niegy
 * 重构代码
 * 
 */
public class GroupCommand extends NodeCreateCommand {
	protected List children;
    protected GroupNode groupNode;
	public GroupCommand(List list,Node parent) {
        super("group Command",parent);
        children = list;
    }
      
	public GroupCommand(String name,Node parent) {
        super(name,parent);
        children = new ArrayList();
    }
	
    public void setGroupNode(GroupNode node) {
    	groupNode = node;    	
    }
    
	public boolean canUndo() {
		return true;
	}
    public void execute() {
    	setGroupNodeRec();
        String ndoeid = getNodeId(groupNode.getId());	  
	    String nameid = getNodeName(groupNode.getName());
	    groupNode.setId(ndoeid);
	    groupNode.setName(nameid);
    	parent.getNodes().add(0, groupNode);   	
        if (children.size() > 1)
            groupNode.groupAll(children);

    }
    
    public void undo() {
        groupNode.ungroupAll(children);
        parent.getNodes().remove(groupNode);
    }
    
	public void redo() {	    
		execute(); 
	}
    
    protected void setGroupNodeRec(){
    	Rectangle rec = getNewRectangle();
    	Location loc = CoreFactory.eINSTANCE.createLocation();
    	loc.setX(rec.x);
    	loc.setY(rec.y);
    	groupNode.setLocation(loc);
    	Size size = CoreFactory.eINSTANCE.createSize();
    	size.setWidth(rec.width);
    	size.setHeight(rec.height);
    	groupNode.setSize(size);
    }
    private Rectangle getRectangle(NodeElement nodeElement){
    	int x = nodeElement.getLocation().getX();
    	int y = nodeElement.getLocation().getY();
    	int width = nodeElement.getSize().getWidth();
    	int height = nodeElement.getSize().getHeight();
    	Rectangle rec = new Rectangle(x,y,width,height);
    	return rec;
    }
    
    private Rectangle getNewRectangle() {
        Rectangle rectangle = null;
        for (Iterator iter = children.iterator(); iter.hasNext();) {
            NodeElement nodeElement = (NodeElement) iter.next();
            Rectangle rectangle1 = getRectangle(nodeElement);
                     
            if(rectangle == null)
                rectangle = rectangle1;
            else
                rectangle.union(rectangle1);
        }
        return rectangle;
    }
}