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WP_Widget_Text::_register_one( integer $number = -1 )

Add hooks for enqueueing assets when registering all widget instances of this widget class.

Parameters

$number

(integer) (Optional) The unique order number of this widget instance compared to other instances of the same class.

Default value: -1

Source

File: wp-includes/widgets/class-wp-widget-text.php 

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

		wp_add_inline_script( 'text-widgets', sprintf( 'wp.textWidgets.idBases.push( %s );', wp_json_encode( $this->id_base ) ) );

		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_print_scripts-widgets.php' action in WP_Customize_Widgets::print_scripts().
		add_action( 'admin_print_scripts-widgets.php', array( $this, 'enqueue_admin_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( 'WP_Widget_Text', 'render_control_template_scripts' ) );
	}

Uses

Uses Description
wp-includes/functions.wp-scripts.php: wp_add_inline_script()

Adds extra code to a registered script.
wp-includes/functions.php: wp_json_encode()

Encode a variable into JSON, with some sanity checks.
wp-includes/plugin.php: add_action()

Hooks a function on to a specific action.
wp-includes/class-wp-widget.php: WP_Widget::_register_one()

Registers an instance of the widget class.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/classes/wp_widget_text/_register_one