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【Java】为菜单添加透明效果

作者:DDT / 发布于2012/6/12/ 482

为菜单添加透明效果

<div>public class CustomMenuItemUI extends BasicMenuItemUI {
public static ComponentUI createUI(JComponent c) {
return new CustomMenuItemUI();
}
<div>public void paint(Graphics g, JComponent comp) {
// paint to the buffered image
BufferedImage bufimg = new BufferedImage(</div>
<div>comp.getWidth(),
comp.getHeight(),
BufferedImage.TYPE_INT_ARGB);</div>
<div>Graphics2D g2 = bufimg.createGraphics();
// restore the foreground color in case the superclass 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);
}
<div>}
<div>public class CustomPopupMenuUI extends BasicPopupMenuUI {
public static ComponentUI createUI(JComponent c) {
return new CustomPopupMenuUI();
}
<div>public void installUI(JComponent c) {
super.installUI(c);
popupMenu.setOpaque(false);
}
<div>public Popup getPopup(JPopupMenu popup, int x, int y) {
Popup pp = super.getPopup(popup,x,y);
JPanel panel = (JPanel)popup.getParent();
panel.setOpaque(false);
return pp;
}
<div>}
<div>public class MenuTest {
public static void main(String[] args) throws Exception { 
UIManager.put("PopupMenuUI","CustomPopupMenuUI"); 
UIManager.put("MenuItemUI","CustomMenuItemUI");
JFrame frame = new JFrame();
JMenuBar mb = new JMenuBar();
frame.setJMenuBar(mb);
JMenu menu = new JMenu("File");
mb.add(menu);
menu.add(new JMenuItem("Open"));
menu.add(new JMenuItem("Save"));
menu.add(new JMenuItem("Close"));
menu.add(new JMenuItem("Exit"));
menu = new JMenu("Edit");
mb.add(menu);</div>
<div>menu.add(new JMenuItem("Cut"));
menu.add(new JMenuItem("Copy"));
menu.add(new JMenuItem("Paste"));
menu.add(new JMenuItem("Paste Special.."));
frame.getContentPane().setLayout(new BorderLayout());
frame.getContentPane().add("North",new JButton("Button"));
frame.getContentPane().add("Center",new JLabel("a label"));
frame.getContentPane().add("South",new JCheckBox("checkbox"));
frame.pack();
frame.setSize(200,150);
frame.show();
/*
UIManager.put("MenuItemUI","CustomMenuItemUI");
RepaintManager.setCurrentManager(new FullRepaintManager());
*/
}
}
</div>

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