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+// A shim to implement the W3C Geolocation API Specification using Gears or the Ajax API
+if ( typeof navigator.geolocation == "undefined" || navigator.geolocation.shim ) (function(){
+
+// -- BEGIN GEARS_INIT
+(function() {
+ // We are already defined. Hooray!
+ if (window.google && google.gears) {
+ return;
+ }
+
+ var factory = null;
+
+ // Firefox
+ if (typeof GearsFactory != 'undefined') {
+ factory = new GearsFactory();
+ } else {
+ // IE
+ try {
+ factory = new ActiveXObject('Gears.Factory');
+ // privateSetGlobalObject is only required and supported on WinCE.
+ if (factory.getBuildInfo().indexOf('ie_mobile') != -1) {
+ factory.privateSetGlobalObject(this);
+ }
+ } catch (e) {
+ // Safari
+ if ((typeof navigator.mimeTypes != 'undefined')
+ && navigator.mimeTypes["application/x-googlegears"]) {
+ factory = document.createElement("object");
+ factory.style.display = "none";
+ factory.width = 0;
+ factory.height = 0;
+ factory.type = "application/x-googlegears";
+ document.documentElement.appendChild(factory);
+ }
+ }
+ }
+
+ // *Do not* define any objects if Gears is not installed. This mimics the
+ // behavior of Gears defining the objects in the future.
+ if (!factory) {
+ return;
+ }
+
+ // Now set up the objects, being careful not to overwrite anything.
+ //
+ // Note: In Internet Explorer for Windows Mobile, you can't add properties to
+ // the window object. However, global objects are automatically added as
+ // properties of the window object in all browsers.
+ if (!window.google) {
+ google = {};
+ }
+
+ if (!google.gears) {
+ google.gears = {factory: factory};
+ }
+})();
+// -- END GEARS_INIT
+
+var GearsGeoLocation = (function() {
+ // -- PRIVATE
+ var geo = google.gears.factory.create('beta.geolocation');
+
+ var wrapSuccess = function(callback, self) { // wrap it for lastPosition love
+ return function(position) {
+ callback(position);
+ self.lastPosition = position;
+ }
+ }
+
+ // -- PUBLIC
+ return {
+ shim: true,
+
+ type: "Gears",
+
+ lastPosition: null,
+
+ getCurrentPosition: function(successCallback, errorCallback, options) {
+ var self = this;
+ var sc = wrapSuccess(successCallback, self);
+ geo.getCurrentPosition(sc, errorCallback, options);
+ },
+
+ watchPosition: function(successCallback, errorCallback, options) {
+ geo.watchPosition(successCallback, errorCallback, options);
+ },
+
+ clearWatch: function(watchId) {
+ geo.clearWatch(watchId);
+ },
+
+ getPermission: function(siteName, imageUrl, extraMessage) {
+ geo.getPermission(siteName, imageUrl, extraMessage);
+ }
+
+ };
+})();
+
+var AjaxGeoLocation = (function() {
+ // -- PRIVATE
+ var loading = false;
+ var loadGoogleLoader = function() {
+ if (!hasGoogleLoader() && !loading) {
+ loading = true;
+ var s = document.createElement('script');
+ s.src = 'http://www.google.com/jsapi?callback=_google_loader_apiLoaded';
+ s.type = "text/javascript";
+ document.getElementsByTagName('body')[0].appendChild(s);
+ }
+ };
+
+ var queue = [];
+ var addLocationQueue = function(callback) {
+ queue.push(callback);
+ }
+
+ var runLocationQueue = function() {
+ if (hasGoogleLoader()) {
+ while (queue.length > 0) {
+ var call = queue.pop();
+ call();
+ }
+ }
+ }
+
+ window['_google_loader_apiLoaded'] = function() {
+ runLocationQueue();
+ }
+
+ var hasGoogleLoader = function() {
+ return (window['google'] && google['loader']);
+ }
+
+ var checkGoogleLoader = function(callback) {
+ if (hasGoogleLoader()) return true;
+
+ addLocationQueue(callback);
+
+ loadGoogleLoader();
+
+ return false;
+ };
+
+ loadGoogleLoader(); // start to load as soon as possible just in case
+
+ // -- PUBLIC
+ return {
+ shim: true,
+
+ type: "ClientLocation",
+
+ lastPosition: null,
+
+ getCurrentPosition: function(successCallback, errorCallback, options) {
+ var self = this;
+ if (!checkGoogleLoader(function() {
+ self.getCurrentPosition(successCallback, errorCallback, options);
+ })) return;
+
+ if (google.loader.ClientLocation) {
+ var cl = google.loader.ClientLocation;
+
+ var position = {
+ latitude: cl.latitude,
+ longitude: cl.longitude,
+ altitude: null,
+ accuracy: 43000, // same as Gears accuracy over wifi?
+ altitudeAccuracy: null,
+ heading: null,
+ velocity: null,
+ timestamp: new Date(),
+
+ // extra info that is outside of the bounds of the core API
+ address: {
+ city: cl.address.city,
+ country: cl.address.country,
+ country_code: cl.address.country_code,
+ region: cl.address.region
+ }
+ };
+
+ successCallback(position);
+
+ this.lastPosition = position;
+ } else if (errorCallback === "function") {
+ errorCallback({ code: 3, message: "Using the Google ClientLocation API and it is not able to calculate a location."});
+ }
+ },
+
+ watchPosition: function(successCallback, errorCallback, options) {
+ this.getCurrentPosition(successCallback, errorCallback, options);
+
+ var self = this;
+ var watchId = setInterval(function() {
+ self.getCurrentPosition(successCallback, errorCallback, options);
+ }, 10000);
+
+ return watchId;
+ },
+
+ clearWatch: function(watchId) {
+ clearInterval(watchId);
+ },
+
+ getPermission: function(siteName, imageUrl, extraMessage) {
+ // for now just say yes :)
+ return true;
+ }
+
+ };
+})();
+
+// If you have Gears installed use that, else use Ajax ClientLocation
+navigator.geolocation = (window.google && google.gears) ? GearsGeoLocation : AjaxGeoLocation;
+
+})();