【WordPress】HTML5のGeolocation APIを使ってBasic Google Maps Placemarksプラグインの地図を表示するショートコードに現在地へ移動するボタンを追加する方法

MY_BasicGoogleMapsPlacemarks.php

<?php
/**
 * Plugin Name: MY Basic Google Maps Placemarks
 * Version: 0.1-alpha
 * Description: PLUGIN DESCRIPTION HERE
 * Author: kurozumi
 * Author URI: http://a-zumi.net
 * Plugin URI: PLUGIN SITE HERE
 * Text Domain: my-basic-google-maps-placemarks
 * Domain Path: /languages
 * @package My-basic-google-maps-placemarks
 */

add_action('plugins_loaded', function() {
	
	if( !class_exists( 'BasicGoogleMapsPlacemarks' ) )
		return;

	class MY_BasicGoogleMapsPlacemarks extends BasicGoogleMapsPlacemarks
	{
		public function mapShortcode( $attributes )
		{
			if( !wp_script_is( 'googleMapsAPI', 'queue' ) || !wp_script_is( 'bgmp', 'queue' ) || !wp_style_is( self::PREFIX .'style', 'queue' ) )
			{
				$error = sprintf(
					__( '<p class="error">%s error: JavaScript and/or CSS files aren\'t loaded. If you\'re using do_shortcode() you need to add a filter to your theme first. See <a href="%s">the FAQ</a> for details.</p>', 'basic-google-maps-placemarks' ),
					BGMP_NAME,
					'http://wordpress.org/extend/plugins/basic-google-maps-placemarks/faq/'
				);
				
				// @todo maybe change this to use views/message.php
				
				return $error;
			}
			
			if( isset( $attributes[ 'categories' ] ) )
				$attributes[ 'categories' ]	= apply_filters( self::PREFIX . 'mapShortcodeCategories', $attributes[ 'categories' ] );		// @todo - deprecated b/c 1.9 output bgmpdata in post; can now just set args in do_shortcode() . also  not consistent w/ shortcode naming scheme and have filter for all arguments now. need a way to notify people
			
			
			$attributes = apply_filters( self::PREFIX . 'map-shortcode-arguments', $attributes );					// @todo - deprecated b/c 1.9 output bgmpdata in post...
			$attributes = $this->cleanMapShortcodeArguments( $attributes );
			
			ob_start();
			do_action( BasicGoogleMapsPlacemarks::PREFIX . 'meta-address-before' );
			// viewsの読み込み先を変更
			require_once( dirname( __FILE__ ) . '/views/shortcode-bgmp-map.php' );
			do_action( BasicGoogleMapsPlacemarks::PREFIX . 'shortcode-bgmp-map-after' );
			$output = ob_get_clean();
			
			return $output;
		}

	}

	$my_bgmp = new MY_BasicGoogleMapsPlacemarks;
}, 9999);