Make ol.style.Image a base class for Icon and Circle

src/ol/style/imagestyle.js

@@ -1,10 +1,7 @@
-// FIXME decide default value for snapToPixel
-
 goog.provide('ol.style.Image');
 goog.provide('ol.style.ImageState');
 
 goog.require('goog.array');
-goog.require('goog.asserts');
 goog.require('goog.events');
 goog.require('goog.events.EventTarget');
 goog.require('goog.events.EventType');
@@ -21,15 +18,24 @@ ol.style.ImageState = {
 };
 
 
+/**
+ * @typedef {{anchor: ol.Pixel,
+ *            imageState: ol.style.ImageState,
+ *            rotation: number,
+ *            size: ol.Size,
+ *            snapToPixel: (boolean|undefined),
+ *            subtractViewRotation: boolean}}
+ */
+ol.style.ImageOptions;
+
+
 
 /**
  * @constructor
- * @param {olx.style.ImageOptions=} opt_options Options.
+ * @param {ol.style.ImageOptions} options Options.
  * @extends {goog.events.EventTarget}
  */
-ol.style.Image = function(opt_options) {
-
-  var options = goog.isDef(opt_options) ? opt_options : {};
+ol.style.Image = function(options) {
 
   goog.base(this);
 
@@ -38,20 +44,10 @@ ol.style.Image = function(opt_options) {
    */
   this.anchor = options.anchor;
 
-  /**
-   * @type {HTMLCanvasElement|HTMLVideoElement|Image}
-   */
-  this.image = goog.isDefAndNotNull(options.image) ?
-      options.image : new Image();
-  if (!goog.isNull(options.crossOrigin)) {
-    this.image.crossOrigin = options.crossOrigin;
-  }
-
   /**
    * @type {ol.style.ImageState}
    */
-  this.imageState = goog.isDef(options.imageState) ?
-      options.imageState : ol.style.ImageState.IDLE;
+  this.imageState = options.imageState;
 
   /**
    * @type {number|undefined}
@@ -73,86 +69,26 @@ ol.style.Image = function(opt_options) {
    */
   this.subtractViewRotation = options.subtractViewRotation;
 
-  /**
-   * @private
-   * @type {Array.<number>}
-   */
-  this.imageListenerKeys_ = null;
-
-  /**
-   * @private
-   * @type {string|undefined}
-   */
-  this.src_ = options.src;
-
 };
 goog.inherits(ol.style.Image, goog.events.EventTarget);
 
 
 /**
- * @private
+ * @protected
  */
-ol.style.Image.prototype.dispatchChangeEvent_ = function() {
+ol.style.Image.prototype.dispatchChangeEvent = function() {
   this.dispatchEvent(goog.events.EventType.CHANGE);
 };
 
 
 /**
- * Tracks loading or read errors.
- *
- * @private
+ * @param {number} pixelRatio Pixel ratio.
+ * @return {HTMLCanvasElement|HTMLVideoElement|Image} Image element.
  */
-ol.style.Image.prototype.handleImageError_ = function() {
-  this.imageState = ol.style.ImageState.ERROR;
-  this.unlistenImage_();
-  this.dispatchChangeEvent_();
-};
-
-
-/**
- * Tracks successful image load.
- *
- * @private
- */
-ol.style.Image.prototype.handleImageLoad_ = function() {
-  this.imageState = ol.style.ImageState.LOADED;
-  if (goog.isNull(this.size)) {
-    this.size = [this.image.width, this.image.height];
-  }
-  if (goog.isNull(this.anchor)) {
-    this.anchor = [this.size[0] / 2, this.size[1] / 2];
-  }
-  this.unlistenImage_();
-  this.dispatchChangeEvent_();
-};
+ol.style.Image.prototype.getImage = goog.abstractMethod;
 
 
 /**
  * Load not yet loaded URI.
  */
-ol.style.Image.prototype.load = function() {
-  if (this.imageState == ol.style.ImageState.IDLE) {
-    goog.asserts.assert(goog.isDef(this.src_));
-    goog.asserts.assert(goog.isNull(this.imageListenerKeys_));
-    this.imageState = ol.style.ImageState.LOADING;
-    this.imageListenerKeys_ = [
-      goog.events.listenOnce(this.image, goog.events.EventType.ERROR,
-          this.handleImageError_, false, this),
-      goog.events.listenOnce(this.image, goog.events.EventType.LOAD,
-          this.handleImageLoad_, false, this)
-    ];
-    this.image.src = this.src_;
-  }
-};
-
-
-/**
- * Discards event handlers which listen for load completion or errors.
- *
- * @private
- */
-ol.style.Image.prototype.unlistenImage_ = function() {
-  goog.asserts.assert(!goog.isNull(this.imageListenerKeys_));
-  goog.array.forEach(this.imageListenerKeys_, goog.events.unlistenByKey);
-  this.imageListenerKeys_ = null;
-};
+ol.style.Image.prototype.load = goog.abstractMethod;