abstractcelleditor.java

java jtable功能的实现

package view;
/*
 * %W% %E%
 *
 * Copyright 1997, 1998 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 * 
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer. 
 *   
 * - Redistribution in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution. 
 *   
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.  
 * 
 * This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY
 * DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT OF OR
 * RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE OR
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 * BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
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 */

import java.awt.Component;
import java.awt.event.*;
import java.awt.AWTEvent;
import com.sun.java.swing.*;
import java.util.EventObject;
import java.io.Serializable;

import javax.swing.CellEditor;
import javax.swing.event.CellEditorListener;
import javax.swing.event.ChangeEvent;
import javax.swing.event.EventListenerList;

/**
 * @version %I% %G% 
 * 
 * A base class for CellEditors, providing default implementations for all 
 * methods in the CellEditor interface and support for managing a series 
 * of listeners. 
 *
 * @author Philip Milne
 */

public class AbstractCellEditor implements CellEditor {

    protected EventListenerList listenerList = new EventListenerList();

    public Object getCellEditorValue() { return null; }
    public boolean isCellEditable(EventObject e) { return true; }
    public boolean shouldSelectCell(EventObject anEvent) { return false; }
    public boolean stopCellEditing() { return true; }
    public void cancelCellEditing() {}

    public void addCellEditorListener(CellEditorListener l) {
	listenerList.add(CellEditorListener.class, l);
    }

    public void removeCellEditorListener(CellEditorListener l) {
	listenerList.remove(CellEditorListener.class, l);
    }

    /**
     * Notify all listeners that have registered interest for
     * notification on this event type.  
     * @see EventListenerList
     */
    protected void fireEditingStopped() {
	// Guaranteed to return a non-null array
	Object[] listeners = listenerList.getListenerList();
	// Process the listeners last to first, notifying
	// those that are interested in this event
	for (int i = listeners.length-2; i>=0; i-=2) {
	    if (listeners[i]==CellEditorListener.class) {
		((CellEditorListener)listeners[i+1]).editingStopped(new ChangeEvent(this));
	    }	       
	}
    }

    /**
     * Notify all listeners that have registered interest for
     * notification on this event type.  
     * @see EventListenerList
     */
    protected void fireEditingCanceled() {
	// Guaranteed to return a non-null array
	Object[] listeners = listenerList.getListenerList();
	// Process the listeners last to first, notifying
	// those that are interested in this event
	for (int i = listeners.length-2; i>=0; i-=2) {
	    if (listeners[i]==CellEditorListener.class) {
		((CellEditorListener)listeners[i+1]).editingCanceled(new ChangeEvent(this));
	    }	       
	}
    }
}