KMSubMenuPage.php

<?php
/**
 * Created by PhpStorm.
 * User: kofi
 * Date: 6/5/19
 * Time: 12:41 PM
 * @author kofi mokome
 * @version  1.0.4
 */

if ( ! class_exists( 'KMSubMenuPage' ) ) {

	#[AllowDynamicProperties]
	class KMSubMenuPage {
		private $page_title;
		private $menu_title;
		private $capability;
		private $menu_slug;
		private $parent_slug;
		private $function;
		private $position;
		private $tabs;

		/**
		 * @param array $data
		 *
		 * @since 1.0.0
		 */
		public function __construct( $data ) {
			$default_data = array(
				'parent_slug' => '',
				'page_title'  => '',
				'menu_title'  => '',
				'capability'  => '',
				'menu_slug'   => '',
				'position'    => 0,
				'function'    => null,
				'use_tabs'    => false
			);
			$data         = array_merge( $default_data, $data );
			$page_title   = sanitize_text_field( $data['page_title'] );
			$menu_title   = wp_kses_post( $data['menu_title'] );
			$capability   = sanitize_text_field( $data['capability'] );
			$menu_slug    = sanitize_text_field( $data['menu_slug'] );
			$position     = sanitize_text_field( $data['position'] );
			$parent_slug  = sanitize_text_field( $data['parent_slug'] );

			$this->page_title  = $page_title;
			$this->menu_title  = $menu_title;
			$this->capability  = $capability;
			$this->menu_slug   = $menu_slug;
			$this->position    = intval( $position );
			$this->parent_slug = $parent_slug;
			$this->function    = $data['function'];
			if ( $data['use_tabs'] ) {
				$this->function = array( &$this, 'show_tabs' );
			}
			$this->tabs = array();
		}

		/**
		 * @since 1.0.0
		 */
		public function show_tabs() {
			$current_tab = isset( $_GET['tab'] ) ? esc_html( $_GET['tab'] ) : null;
			?>
            <div class="wrap">
                <div id="icon-options-general" class="icon32"></div>
                <h1><?php echo esc_html( $this->page_title ) ?></h1>
				<?php if ( sizeof( $this->tabs ) > 0 ): ?>
                    <nav class="nav-tab-wrapper">
						<?php foreach ( $this->tabs as $id => $tab ): ?>
                            <a href="?page=<?php echo esc_html( $this->menu_slug ) ?>&tab=<?php echo esc_html( $id ) ?>"
                               class="nav-tab <?php if ( $id === $current_tab ): ?>nav-tab-active<?php endif; ?>"><?php echo esc_html( $tab['title'] ) ?></a>
						<?php endforeach; ?>

                    </nav>
					<?php
					$to_display = $current_tab == null ? array_shift( $this->tabs ) : $this->tabs[ $current_tab ];
					?>
					<?php echo is_callable( $to_display['contents'] ) ? $to_display['contents']( $to_display['args'] ) : $to_display; ?>
				<?php else: ?>
                    <div class="notice notice-error">
                        <p><strong>Please add a tab first, or set <code>use_tab</code> to false</strong></p>
                    </div>
				<?php endif; ?>


            </div>
			<?php
			//echo $this->default_content;
		}

		/**
		 * Adds a new tab to the page
		 *
		 * @param string $id ID of the tab
		 * @param string $title Title of the tab
		 * @param callable|string $contents Content to display in the tab
		 * @param array $args Arguments to pass to callback function
		 *
		 * @since 1.0.0
		 */
		public function add_tab( $id, $title, $contents, array $args = [] ) {
			$id                = trim( sanitize_text_field( $id ) );
			$this->tabs[ $id ] = array( 'title' => $title, 'contents' => $contents, 'args' => $args );
			// array_push($this->tabs, array($id, $title));
		}

		/**
		 * @since 1.0.0
		 */
		public function run() {
			$this->create_sub_menu_page();
		}


		/**
		 * @since 1.0.0
		 */
		public function create_sub_menu_page() {
			add_submenu_page(
				$this->parent_slug,
				$this->page_title,
				$this->menu_title,
				$this->capability,
				$this->menu_slug,
				$this->function,
				intval( $this->position )
			);
		}

		/**
		 * @since 1.0.1
		 */
		public function set_parent_slug( $slug ) {
			$this->parent_slug = $slug;
		}
	}
}