Source
File: wp-includes/widgets/class-wp-widget-media.php
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 );
}