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-// Copyright 2012 The Closure Library Authors. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS-IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-/**
- * @fileoverview Simple image loader, used for preloading.
- * @author nnaze@google.com (Nathan Naze)
- */
-
-goog.provide('goog.labs.net.image');
-
-goog.require('goog.events.EventHandler');
-goog.require('goog.events.EventType');
-goog.require('goog.net.EventType');
-goog.require('goog.result.SimpleResult');
-goog.require('goog.userAgent');
-
-
-/**
- * Loads a single image. Useful for preloading images. May be combined with
- * goog.result.combine to preload many images.
- *
- * @param {string} uri URI of the image.
- * @param {(Image|function(): !Image)=} opt_image If present, instead of
- * creating a new Image instance the function will use the passed Image
- * instance or the result of calling the Image factory respectively. This
- * can be used to control exactly how Image instances are created, for
- * example if they should be created in a particular document element, or
- * have fields that will trigger CORS image fetches.
- * @return {!goog.result.Result} An asyncronous result that will succeed
- * if the image successfully loads or error if the image load fails.
- */
-goog.labs.net.image.load = function(uri, opt_image) {
- var image;
- if (!goog.isDef(opt_image)) {
- image = new Image();
- } else if (goog.isFunction(opt_image)) {
- image = opt_image();
- } else {
- image = opt_image;
- }
-
- // IE's load event on images can be buggy. Instead, we wait for
- // readystatechange events and check if readyState is 'complete'.
- // See:
- // http://msdn.microsoft.com/en-us/library/ie/ms536957(v=vs.85).aspx
- // http://msdn.microsoft.com/en-us/library/ie/ms534359(v=vs.85).aspx
- var loadEvent = goog.userAgent.IE ? goog.net.EventType.READY_STATE_CHANGE :
- goog.events.EventType.LOAD;
-
- var result = new goog.result.SimpleResult();
-
- var handler = new goog.events.EventHandler();
- handler.listen(
- image,
- [loadEvent, goog.net.EventType.ABORT, goog.net.EventType.ERROR],
- function(e) {
-
- // We only registered listeners for READY_STATE_CHANGE for IE.
- // If readyState is now COMPLETE, the image has loaded.
- // See related comment above.
- if (e.type == goog.net.EventType.READY_STATE_CHANGE &&
- image.readyState != goog.net.EventType.COMPLETE) {
- return;
- }
-
- // At this point, we know whether the image load was successful
- // and no longer care about image events.
- goog.dispose(handler);
-
- // Whether the image successfully loaded.
- if (e.type == loadEvent) {
- result.setValue(image);
- } else {
- result.setError();
- }
- });
-
- // Initiate the image request.
- image.src = uri;
-
- return result;
-};