element.java

GEF初学者可以用来对照的小例子

/*
 * Created on 2005-1-24
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package com.example.model;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.io.Serializable;

/**
 * @author zhanghao
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public abstract class Element implements Cloneable, Serializable {

    PropertyChangeSupport listeners = new PropertyChangeSupport(this);

    public void addPropertyChangeListener(PropertyChangeListener l) {
        listeners.addPropertyChangeListener(l);
    }

    protected void firePropertyChange(String prop, Object old, Object newValue) {
        listeners.firePropertyChange(prop, old, newValue);
    }

    protected void fireStructureChange(String prop, Object child) {
        listeners.firePropertyChange(prop, null, child);
    }

//    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
//        in.defaultReadObject();
//        listeners = new PropertyChangeSupport(this);
//    }

    public void removePropertyChangeListener(PropertyChangeListener l) {
        listeners.removePropertyChangeListener(l);
    }

}