If you type Japanese into a transparent JFrame, the background will turn white.

If you enter Japanese into JTextArea with JFrame transparent, the frame will turn white.
Once it turns white, it remains white unless it is redisplayed.Does anyone know how to avoid this phenomenon?

public static void main(String[]args){
    JFrame frame = new JFrame();
    frame.setSize(670,500);
    frame.setLocation(600,420);
    frame.setUndecorated(true);                             
    frame.setBackground(new Color(0x00000000, true));       
    frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);

    JTextArea text=new JTextArea();
    text.setBackground (Color.RED);
    text.setBounds (85, 120, 265, 240);

    JPanel panel = new JPanel();
    panel.setOpaque(false);
    panel.setLayout(null);
    panel.add(text);
    Container content=frame.getContentPane();
    content.add(panel);
    frame.setVisible(true);
}

environment:windows7java8

java

2022-09-30 21:30

1 Answers

There was a similar question and answer in my home SO.

According to the answer, it seems to be caused by a bug in the DirectDraw pipeline in Swing.
By disabling DirectDraw rendering, we avoided the problem.

public static void main(String[]args){
    System.setProperty("sun.java2d.noddraw", "true"); // Add this line
    JFrame frame = new JFrame(); // Same as below
    // Omitted
}

The above is a quick fix.
If you want to disable DirectDraw for individual JTextArea, see your SO answer to inherit JTextArea and override paintComponent.

2022-09-30 21:30

If you have any answers or tips

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