class ProgressBarMixin implements Mixin {

    public void setShown(boolean shown) {
        if (shown) {
            View progressBar = getProgressBar();
            if (progressBar != null) {
                progressBar.setVisibility(View.VISIBLE);
            }
        } else {
            View progressBar = peekProgressBar();
            if (progressBar != null) {
                progressBar.setVisibility(View.GONE);
            }
        }
    }

    public  ProgressBarMixin(TemplateLayout layout);

}