WP_Widget_Media::_register_one( int $number = -1 )

Source

public function _register_one( $number = -1 ) {
	parent::_register_one( $number );
	if ( $this->registered ) {
		return;
	}
	$this->registered = true;

	/*
	 * Note that the widgets component in the customizer will also do
	 * the 'admin_print_scripts-widgets.php' action in WP_Customize_Widgets::print_scripts().
	 */
	add_action( 'admin_print_scripts-widgets.php', array( $this, 'enqueue_admin_scripts' ) );

	if ( $this->is_preview() ) {
		add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_preview_scripts' ) );
	}

	/*
	 * Note that the widgets component in the customizer will also do
	 * the 'admin_footer-widgets.php' action in WP_Customize_Widgets::print_footer_scripts().
	 */
	add_action( 'admin_footer-widgets.php', array( $this, 'render_control_template_scripts' ) );

	add_filter( 'display_media_states', array( $this, 'display_media_state' ), 10, 2 );
}

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