java7中使用透明时与输入法冲突

static {
System.setProperty("sun.java2d.noddraw", "true");
System.setProperty("sun.java2d.d3d", "false");
}

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;

public class Test {

public static class JTextField2 extends JTextField {
private static final long serialVersionUID = 1L;
private BufferedImage buffer = null;

@Override public void paintComponent(Graphics g) {
Component window = this.getTopLevelAncestor();
if (window instanceof Window && !((Window)window).isOpaque()) {
// This is a translucent window, so we need to draw to a buffer
// first to work around a bug in the DirectDraw rendering in Swing.
int w = this.getWidth();
int h = this.getHeight();
if (buffer == null || buffer.getWidth() != w || buffer.getHeight() != h) {
// Create a new buffer based on the current size.
GraphicsConfiguration gc = this.getGraphicsConfiguration();
buffer = gc.createCompatibleImage(w, h, BufferedImage.TRANSLUCENT);
}

// Use the super class's paintComponent implementation to draw to
// the buffer, then write that buffer to the original Graphics object.
Graphics bufferGraphics = buffer.createGraphics();
try {
super.paintComponent(bufferGraphics);
} finally {
bufferGraphics.dispose();
}
g.drawImage(buffer, 0, 0, w, h, 0, 0, w, h, null);
} else {
// This is not a translucent window, so we can call the super class
// implementation directly.
super.paintComponent(g);
}
}
}

public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override public void run() {
final JFrame frame = new JFrame();
frame.setUndecorated(true);
frame.setBackground(new Color(96, 128, 160, 192));

JTextField textField = new JTextField2();
JButton exitButton = new JButton("Exit");
exitButton.addActionListener(new ActionListener() {
@Override public void actionPerformed(ActionEvent e) {
frame.dispose();
}
});

frame.add(exitButton, BorderLayout.PAGE_START);
frame.add(textField, BorderLayout.PAGE_END);

frame.setSize(400, 400);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}