myfocuslistener.java

来自「Java 简易小相册.帮你理解Drag and Drop 的功能.」· Java 代码 · 共 52 行

import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;

import javax.swing.JComponent;
/*
 * Created on 1/07/2006
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */

/**
 * @author Xuesong Le
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class MyFocusListener implements FocusListener
{
    JComponent 
    	picComp = null;
    
    MyFocusListener(JComponent picComp)
    {
        this.picComp = picComp;
    }
    
    public static void main(String[] args)
    {
    }

    /* (non-Javadoc)
     * @see java.awt.event.FocusListener#focusGained(java.awt.event.FocusEvent)
     */
    public void focusGained(FocusEvent arg0)
    {
        // TODO Auto-generated method stub
        // ask for a red rectangle
        picComp.repaint();
    }

    /* (non-Javadoc)
     * @see java.awt.event.FocusListener#focusLost(java.awt.event.FocusEvent)
     */
    public void focusLost(FocusEvent arg0)
    {
        // TODO Auto-generated method stub
        // ask for a black rectangle
        picComp.repaint();
    }
}