custommenuitemui.java

oraily的Swing hacks code

import java.awt.*;
import java.awt.image.*;
import javax.swing.*;
import javax.swing.plaf.*;
import javax.swing.plaf.metal.*;
import javax.swing.plaf.basic.*;

public class CustomMenuItemUI extends BasicMenuItemUI {

    public static ComponentUI createUI(JComponent c) {
        return new CustomMenuItemUI();
    }
    
    public void paint(Graphics g, JComponent comp) {
        // paint to the buffered image
        BufferedImage bufimg = new BufferedImage(comp.getWidth(),comp.getHeight(),
            BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2 = bufimg.createGraphics();        
        // restore the foreground color in case the super class needs it
        g2.setColor(g.getColor());
        super.paint(g2,comp);
        // do an alpha composite
        Graphics2D gx = (Graphics2D) g;
        gx.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,0.8f));
        gx.drawImage(bufimg,0,0,null);
    }
    
}