Add WooCommerce flyout menu (https://github.com/woocommerce/woocommerce-admin/pull/6165)

* Unhide the submenu

* Add method to get items by category

* Add flyout menu items

* Sort items by menu ID

* Allow marketplace in flyout menu

* Remove unused styles on non-wc pages

plugins/woocommerce-admin/packages/navigation/src/style.scss

@@ -1,17 +0,0 @@
-// Hide elements on non-WooCommerce pages.
-body.js:not(.has-woocommerce-navigation) {
-	#adminmenu
-	li.toplevel_page_woocommerce.wp-has-submenu.wp-not-current-submenu.opensub:hover::after {
-		display: none;
-	}
-
-	.toplevel_page_woocommerce ul.wp-submenu {
-		display: none;
-
-		@include breakpoint( '<782px' ) {
-			.wp-first-item.hide-if-js {
-				display: list-item;
-			}
-		}
-	}
-}

plugins/woocommerce-admin/src/Features/Navigation/CoreMenu.php

@@ -36,6 +36,8 @@ class CoreMenu {
 	 */
 	public function init() {
 		add_action( 'admin_menu', array( $this, 'register_post_types' ) );
+		// Add this after we've finished migrating menu items to avoid hiding these items.
+		add_action( 'add_menu_classes', array( $this, 'add_dashboard_menu_items' ), PHP_INT_MAX );
 	}
 
 	/**
@@ -275,6 +277,64 @@ class CoreMenu {
 		Screen::register_post_type( 'shop_coupon' );
 	}
 
+	/**
+	 * Add the dashboard items to the WP menu to create a quick-access flyout menu.
+	 *
+	 * @param array $menu Menu.
+	 * @returna array
+	 */
+	public function add_dashboard_menu_items( $menu ) {
+		$top_level_items = Menu::get_category_items( 'woocommerce' );
+
+		// phpcs:disable
+		global $submenu;
+
+		if ( ! isset( $submenu['woocommerce'] ) ) {
+			return $menu;
+		}
+
+		foreach( $top_level_items as $item ) {
+			// Skip specific categories.
+			if (
+				in_array(
+					$item['id'],
+					array(
+						'woocommerce-tools',
+					),
+					true
+				)
+			) {
+				continue;
+			}
+
+			// Use the link from the first item if it's a category.
+			if ( ! isset( $item['url'] ) ) {
+				$category_items = Menu::get_category_items( $item['id'] );
+				$first_item     = $category_items[0];
+
+				$submenu['woocommerce'][] = array(
+					$item['title'],
+					$first_item['capability'],
+					isset( $first_item['url'] ) ? $first_item['url'] : null,
+					$item['title'],
+				);
+
+				continue;
+			}
+
+			// Show top-level items.
+			$submenu['woocommerce'][] = array(
+				$item['title'],
+				$item['capability'],
+				isset( $item['url'] ) ? $item['url'] : null,
+				$item['title'],
+			);
+		}
+		// phpcs:enable
+
+		return $menu;
+	}
+
 	/**
 	 * Get items excluded from WooCommerce menu migration.
 	 *

plugins/woocommerce-admin/src/Features/Navigation/Init.php

@@ -34,7 +34,6 @@ class Init {
 
 		if ( Loader::is_feature_enabled( 'navigation' ) ) {
 			add_action( 'in_admin_header', array( __CLASS__, 'embed_navigation' ) );
-			add_action( 'admin_enqueue_scripts', array( $this, 'maybe_enqueue_scripts' ) );
 
 			Menu::instance()->init();
 			CoreMenu::instance()->init();
@@ -146,24 +145,6 @@ class Init {
 		<?php
 	}
 
-	/**
-	 * Enqueue scripts on non-WooCommerce pages.
-	 */
-	public function maybe_enqueue_scripts() {
-		if ( Screen::is_woocommerce_page() ) {
-			return;
-		}
-
-		$rtl = is_rtl() ? '-rtl' : '';
-
-		wp_enqueue_style(
-			'wc-admin-navigation',
-			Loader::get_url( "navigation/style{$rtl}", 'css' ),
-			array(),
-			Loader::get_file_version( 'css' )
-		);
-	}
-
 	/**
 	 * Reloads the page when the option is toggled to make sure all nav features are loaded.
 	 *

plugins/woocommerce-admin/src/Features/Navigation/Menu.php

@@ -56,6 +56,15 @@ class Menu {
 	 */
 	protected static $menu_items = array();
 
+	/**
+	 * Store categories with menu item IDs.
+	 *
+	 * @var array
+	 */
+	protected static $categories = array(
+		'woocommerce' => array(),
+	);
+
 	/**
 	 * Registered callbacks or URLs with migration boolean as key value pairs.
 	 *
@@ -172,7 +181,9 @@ class Menu {
 			);
 		}
 
-		self::$menu_items[ $menu_item['id'] ] = $menu_item;
+		self::$menu_items[ $menu_item['id'] ]       = $menu_item;
+		self::$categories[ $menu_item['id'] ]       = array();
+		self::$categories[ $menu_item['parent'] ][] = $menu_item['id'];
 
 		if ( isset( $args['url'] ) ) {
 			self::$callbacks[ $args['url'] ] = $menu_item['migrate'];
@@ -230,7 +241,8 @@ class Menu {
 
 		$menu_item['menuId'] = self::get_item_menu_id( $menu_item );
 
-		self::$menu_items[ $menu_item['id'] ] = $menu_item;
+		self::$menu_items[ $menu_item['id'] ]       = $menu_item;
+		self::$categories[ $menu_item['parent'] ][] = $menu_item['id'];
 
 		if ( isset( $args['url'] ) ) {
 			self::$callbacks[ $args['url'] ] = $menu_item['migrate'];
@@ -644,7 +656,32 @@ class Menu {
 	 * @return array
 	 */
 	public static function get_items() {
-		return apply_filters( 'woocommerce_navigation_menu_items', self::$menu_items );
+		$menu_items = self::get_prepared_menu_item_data( self::$menu_items );
+		return apply_filters( 'woocommerce_navigation_menu_items', $menu_items );
+	}
+
+	/**
+	 * Get registered menu items.
+	 *
+	 * @return array
+	 */
+	public static function get_category_items( $category ) {
+		if ( ! isset( self::$categories[ $category ] ) ) {
+			return array();
+		}
+
+		$menu_item_ids = self::$categories[ $category ];
+
+		
+		$category_menu_items = array();
+		foreach ( $menu_item_ids as $id ) {
+			if ( isset( self::$menu_items[ $id ] ) ) {
+				$category_menu_items[] = self::$menu_items[ $id ];
+			}
+		}
+
+		$category_menu_items = self::get_prepared_menu_item_data( $category_menu_items );
+		return apply_filters( 'woocommerce_navigation_menu_category_items', $category_menu_items );
 	}
 
 	/**
@@ -659,10 +696,10 @@ class Menu {
 	/**
 	 * Gets the menu item data for use in the client.
 	 *
+	 * @param array $menu_items Menu items to prepare.
 	 * @return array
 	 */
-	public static function get_prepared_menu_item_data() {
+	public static function get_prepared_menu_item_data( $menu_items ) {
-		$menu_items = self::get_items();
 		foreach ( $menu_items as $index => $menu_item ) {
 			if ( $menu_item[ 'capability' ] && ! current_user_can( $menu_item[ 'capability' ] ) ) {
 				unset( $menu_items[ $index ] );
@@ -670,11 +707,17 @@ class Menu {
 		}
 
 		// Sort the menu items.
-		$order = array_column( $menu_items, 'order' );
+		$menuOrder = array(
-		$title = array_column( $menu_items, 'title' );
+			'primary'   => 0,
-		array_multisort( $order, SORT_ASC, $title, SORT_ASC, $menu_items );
+			'secondary' => 1,
+			'plugins'   => 2,
+		);
+		$menu      = array_map( function( $item ) use( $menuOrder ) { return $menuOrder[ $item['menuId'] ]; }, $menu_items );
+		$order     = array_column( $menu_items, 'order' );
+		$title     = array_column( $menu_items, 'title' );
+		array_multisort( $menu, SORT_ASC, $order, SORT_ASC, $title, SORT_ASC, $menu_items );
 
-		return array_values( $menu_items );
+		return $menu_items;
 	}
 
 	/**
@@ -685,7 +728,7 @@ class Menu {
 	 */
 	public function enqueue_data( $menu ) {
 		$data = array(
-			'menuItems'     => self::get_prepared_menu_item_data(),
+			'menuItems'     => array_values( self::get_items() ),
 			'rootBackUrl'   => apply_filters( 'woocommerce_navigation_root_back_url', get_dashboard_url() ),
 			'rootBackLabel' => apply_filters( 'woocommerce_navigation_root_back_label', __( 'WordPress Dashboard', 'woocommerce-admin' ) ),
 		);