WordPress/wp-includes/customize/class-wp-customize-nav-menus-panel.php

<?php
/**
 * Customize API: WP_Customize_Nav_Menus_Panel class
 *
 * @package WordPress
 * @subpackage Customize
 * @since 4.4.0
 */

/**
 * Customize Nav Menus Panel Class
 *
 * Needed to add screen options.
 *
 * @since 4.3.0
 *
 * @see WP_Customize_Panel
 */
class WP_Customize_Nav_Menus_Panel extends WP_Customize_Panel {

	/**
	 * Control type.
	 *
	 * @since 4.3.0
	 * @access public
	 * @var string
	 */
	public $type = 'nav_menus';

	/**
	 * Render screen options for Menus.
	 *
	 * @since 4.3.0
	 * @access public
	 */
	public function render_screen_options() {
		// Essentially adds the screen options.
		add_filter( 'manage_nav-menus_columns', array( $this, 'wp_nav_menu_manage_columns' ) );

		// Display screen options.
		$screen = WP_Screen::get( 'nav-menus.php' );
		$screen->render_screen_options( array( 'wrap' => false ) );
	}

	/**
	 * Returns the advanced options for the nav menus page.
	 *
	 * Link title attribute added as it's a relatively advanced concept for new users.
	 *
	 * @since 4.3.0
	 * @access public
	 *
	 * @return array The advanced menu properties.
	 */
	public function wp_nav_menu_manage_columns() {
		return array(
			'_title'      => __( 'Show advanced menu properties' ),
			'cb'          => '<input type="checkbox" />',
			'link-target' => __( 'Link Target' ),
			'attr-title'  => __( 'Title Attribute' ),
			'css-classes' => __( 'CSS Classes' ),
			'xfn'         => __( 'Link Relationship (XFN)' ),
			'description' => __( 'Description' ),
		);
	}

	/**
	 * An Underscore (JS) template for this panel's content (but not its container).
	 *
	 * Class variables for this panel class are available in the `data` JS object;
	 * export custom variables by overriding WP_Customize_Panel::json().
	 *
	 * @since 4.3.0
	 * @access protected
	 *
	 * @see WP_Customize_Panel::print_template()
	 */
	protected function content_template() {
		?>
		<li class="panel-meta customize-info accordion-section <# if ( ! data.description ) { #> cannot-expand<# } #>">
			<button type="button" class="customize-panel-back" tabindex="-1">
				<span class="screen-reader-text"><?php _e( 'Back' ); ?></span>
			</button>
			<div class="accordion-section-title">
				<span class="preview-notice">
					<?php
					/* translators: %s: the site/panel title in the Customizer */
					printf( __( 'You are customizing %s' ), '<strong class="panel-title">{{ data.title }}</strong>' );
					?>
				</span>
				<button type="button" class="customize-help-toggle dashicons dashicons-editor-help" aria-expanded="false">
					<span class="screen-reader-text"><?php _e( 'Help' ); ?></span>
				</button>
				<button type="button" class="customize-screen-options-toggle" aria-expanded="false">
					<span class="screen-reader-text"><?php _e( 'Menu Options' ); ?></span>
				</button>
			</div>
			<# if ( data.description ) { #>
			<div class="description customize-panel-description">{{{ data.description }}}</div>
			<# } #>
			<div id="screen-options-wrap">
				<?php $this->render_screen_options(); ?>
			</div>
		</li>
	<?php
	}
}