为什么把菜单项目添加了加速器后,只有在打开了菜单时才起做用呢?exit.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,InputEvent.CTRL_MASK));
exit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}});
代码是这样的
exit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}});
代码是这样的
应该可以
给你哥源码参考import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.*;
import javax.swing.*;public class ImageMenu extends JPopupMenu {
private Font font = new Font("Dialog", Font.BOLD, 13);
private ImageIcon imageIcon = null;public ImageMenu(ImageIcon imageIcon) {
this.imageIcon = imageIcon;
}public ImageMenu(String text) {
this.imageIcon = createImage(text);
}private ImageIcon createImage(String text) {
BufferedImage bi = new BufferedImage(30, 1000, BufferedImage.TYPE_INT_ARGB);
ImageIcon image = new ImageIcon(bi);
Graphics2D g2d = bi.createGraphics();GradientPaint paint = new GradientPaint(0, 0, Color.yellow, 30, 10, Color.red, true);
g2d.setPaint(paint);g2d.fillRect(0, 0, bi.getWidth(), bi.getHeight());AffineTransform at = new AffineTransform();
at.rotate( -Math.PI / 2);g2d.setTransform(at);
g2d.setColor(Color.white);
g2d.setFont(font);
g2d.drawString(text, -180, bi.getWidth() / 2);return image;
}public Insets getInsets() {
Insets insets = (Insets)super.getInsets().clone();
insets.left += imageIcon.getIconWidth();
return insets;
}public void paint(Graphics g) {
super.paint(g);
if (imageIcon != null) {
Insets insets = getInsets();
g.drawImage(imageIcon.getImage(),
insets.left - imageIcon.getIconWidth(),
insets.top,
null);
}
}public static void main(String[] args) {
final JFrame frame = new JFrame();
frame.setSize(600, 500);
frame.setTitle("ImageMenu");
final ImageMenu menu = new ImageMenu("Windows XP Perfessional");
menu.add(new JMenuItem("Winzip 8.0"));
menu.addSeparator();
menu.add(new JMenuItem("Programs"));
menu.add(new JMenuItem("Document"));
menu.add(new JMenuItem("Settings"));
menu.add(new JMenuItem("Search"));
menu.add(new JMenuItem("Help and Support"));
menu.add(new JMenuItem("Run..."));
menu.addSeparator();
menu.add(new JMenuItem("Shut Down..."));
JLabel label = new JLabel("Right click me to show image popup menu.");
label.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseReleased(MouseEvent e) {
if (e.isPopupTrigger()) {
menu.show(frame, e.getPoint().x, e.getPoint().y);
}
}
});
frame.getContentPane().add(label, BorderLayout.CENTER);
frame.setVisible(true);
}
}