如何在我的矩形(自定义按钮)中添加鼠标监听器来重新执行java中的绘图组件？

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class CustomButton extends JPanel {

    private boolean isPressed = false;

    public CustomButton() {
        // 设置按钮的大小和背景颜色
        setPreferredSize(new Dimension(100, 50));
        setBackground(Color.gray);

        // 添加鼠标监听器
        addMouseListener(new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent e) {
                isPressed = true;
                repaint(); // 重新绘制按钮
            }

            @Override
            public void mouseReleased(MouseEvent e) {
                isPressed = false;
                repaint(); // 重新绘制按钮
            }
        });
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);

        Graphics2D g2d = (Graphics2D) g;
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

        // 根据按钮状态绘制不同的外观
        if (isPressed) {
            g2d.setColor(Color.darkGray);
        } else {
            g2d.setColor(Color.gray);
        }

        g2d.fillRect(0, 0, getWidth(), getHeight());

        // 绘制按钮文本
        g2d.setColor(Color.white);
        g2d.setFont(new Font("Arial", Font.BOLD, 16));
        String buttonText = "按钮";
        FontMetrics fm = g2d.getFontMetrics();
        int textWidth = fm.stringWidth(buttonText);
        int textHeight = fm.getHeight();
        int x = (getWidth() - textWidth) / 2;
        int y = (getHeight() - textHeight) / 2 + fm.getAscent();
        g2d.drawString(buttonText, x, y);
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Custom Button");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(new CustomButton());
        frame.pack();
        frame.setVisible(true);
    }
}