Replace source ready flag with loading/ready/error enum

src/ol/source/bingmapssource.js

@@ -9,6 +9,7 @@ goog.require('ol.TileRange');
 goog.require('ol.TileUrlFunction');
 goog.require('ol.extent');
 goog.require('ol.proj');
+goog.require('ol.source.State');
 goog.require('ol.source.TileImage');
 goog.require('ol.tilegrid.XYZ');
 
@@ -25,6 +26,7 @@ ol.source.BingMaps = function(options) {
     crossOrigin: 'anonymous',
     opaque: true,
     projection: ol.proj.get('EPSG:3857'),
+    state: ol.source.State.LOADING,
     tileLoadFunction: options.tileLoadFunction
   });
 
@@ -34,12 +36,6 @@ ol.source.BingMaps = function(options) {
    */
   this.culture_ = goog.isDef(options.culture) ? options.culture : 'en-us';
 
-  /**
-   * @private
-   * @type {boolean}
-   */
-  this.ready_ = false;
-
   var uri = new goog.Uri(
       '//dev.virtualearth.net/REST/v1/Imagery/Metadata/' + options.style);
   var jsonp = new goog.net.Jsonp(uri, 'jsonp');
@@ -139,16 +135,6 @@ ol.source.BingMaps.prototype.handleImageryMetadataResponse =
 
   this.setLogo(brandLogoUri);
 
-  this.ready_ = true;
-
-  this.dispatchChangeEvent();
+  this.setState(ol.source.State.READY);
 
 };
-
-
-/**
- * @inheritDoc
- */
-ol.source.BingMaps.prototype.isReady = function() {
-  return this.ready_;
-};