如何在libgdx中禁用按钮？

import com.badlogic.gdx.scenes.scene2d.ui.Button;
import com.badlogic.gdx.scenes.scene2d.utils.Drawable;

public class CustomButton extends Button {
    private boolean disabled;

    public CustomButton(Drawable up, Drawable down, Drawable checked) {
        super(up, down, checked);
    }

    public void setDisabled(boolean disabled) {
        this.disabled = disabled;
    }

    @Override
    public void draw(Batch batch, float parentAlpha) {
        if (disabled) {
            // 绘制禁用状态的按钮外观
        } else {
            super.draw(batch, parentAlpha);
        }
    }

    @Override
    public boolean touchDown(float x, float y, int pointer, int button) {
        if (disabled) {
            return false; // 忽略触摸事件
        } else {
            return super.touchDown(x, y, pointer, button);
        }
    }
}