private function showControls()
    {
        //set controll btn class name
        $jsClassName = 'js-audio-widget-action';
        foreach($this->settings['controls'] as $key => $value) {
            if ($value) {
                $cssClassName = 'audio-widget-' . $key;
                $options['class'] = $cssClassName . ' ' . $jsClassName;
                $options['data-action'] = $key;
                //show controll btn
                echo Html::button($key, $options);
            }
        }
        $this->widgetSettings['controls'] = [
            'btnClass' => '.' . $jsClassName
        ];
    }