pulling full screen api detection out into is own file per ians suggestion

Gruntfile.js

@@ -13,6 +13,7 @@ module.exports = function(grunt) {
         minified = "build/openseadragon/openseadragon.min.js",
         sources = [
             "src/openseadragon.js",
+            "src/fullscreen.js",
             "src/eventhandler.js",
             "src/mousetracker.js",
             "src/control.js",

src/fullscreen.js

@@ -0,0 +1,78 @@
+/**
+ * Determines the appropriate level of native full screen support we can get 
+ * from the browser.
+ * Thanks to John Dyer for the implementation and research
+ * http://johndyer.name/native-fullscreen-javascript-api-plus-jquery-plugin/
+ * Also includes older IE support based on
+ * http://stackoverflow.com/questions/1125084/how-to-make-in-javascript-full-screen-windows-stretching-all-over-the-screen/7525760
+ * @name $.supportsFullScreen
+ */
+(function( $ ) {
+    var fullScreenApi = {
+            supportsFullScreen: false,
+            isFullScreen: function() { return false; },
+            requestFullScreen: function() {},
+            cancelFullScreen: function() {},
+            fullScreenEventName: '',
+            prefix: ''
+        },
+        browserPrefixes = 'webkit moz o ms khtml'.split(' ');
+ 
+    // check for native support
+    if (typeof document.cancelFullScreen != 'undefined') {
+        fullScreenApi.supportsFullScreen = true;
+    } else {
+        // check for fullscreen support by vendor prefix
+        for (var i = 0, il = browserPrefixes.length; i < il; i++ ) {
+            fullScreenApi.prefix = browserPrefixes[i];
+ 
+            if (typeof document[fullScreenApi.prefix + 'CancelFullScreen' ] != 'undefined' ) {
+                fullScreenApi.supportsFullScreen = true;
+ 
+                break;
+            }
+        }
+    }
+ 
+    // update methods to do something useful
+    if (fullScreenApi.supportsFullScreen) {
+        fullScreenApi.fullScreenEventName = fullScreenApi.prefix + 'fullscreenchange';
+ 
+        fullScreenApi.isFullScreen = function() {
+            switch (this.prefix) {
+                case '':
+                    return document.fullScreen;
+                case 'webkit':
+                    return document.webkitIsFullScreen;
+                default:
+                    return document[this.prefix + 'FullScreen'];
+            }
+        };
+        fullScreenApi.requestFullScreen = function( element ) {
+            return (this.prefix === '') ? 
+                element.requestFullScreen() : 
+                element[this.prefix + 'RequestFullScreen']();
+
+        };
+        fullScreenApi.cancelFullScreen = function( element ) {
+            return (this.prefix === '') ? 
+                document.cancelFullScreen() : 
+                document[this.prefix + 'CancelFullScreen']();
+        };
+    } else if ( typeof window.ActiveXObject !== "undefined" ){
+        // Older IE.
+        fullScreenApi.requestFullScreen = function(){
+            var wscript = new ActiveXObject("WScript.Shell");
+            if ( wscript !== null ) {
+                wscript.SendKeys("{F11}");
+            }
+            return false;
+        };
+        fullScreenApi.cancelFullScreen = fullScreenApi.requestFullScreen;
+    }
+
+ 
+    // export api
+    $.extend( $, fullScreenApi );
+
+})( OpenSeadragon );

src/openseadragon.js

@@ -1655,84 +1655,7 @@ window.OpenSeadragon = window.OpenSeadragon || function( options ){
 
     })();
 
-    /**
-     * Determines the appropriate level of native full screen support we can get 
-     * from the browser.
-     * Thanks to John Dyer for the implementation and research
-     * http://johndyer.name/native-fullscreen-javascript-api-plus-jquery-plugin/
-     * Also includes older IE support based on
-     * http://stackoverflow.com/questions/1125084/how-to-make-in-javascript-full-screen-windows-stretching-all-over-the-screen/7525760
-     * @name $.supportsFullScreen
-     */
-    (function() {
-        var fullScreenApi = {
-                supportsFullScreen: false,
-                isFullScreen: function() { return false; },
-                requestFullScreen: function() {},
-                cancelFullScreen: function() {},
-                fullScreenEventName: '',
-                prefix: ''
-            },
-            browserPrefixes = 'webkit moz o ms khtml'.split(' ');
     
-        // check for native support
-        if (typeof document.cancelFullScreen != 'undefined') {
-            fullScreenApi.supportsFullScreen = true;
-        } else {
-            // check for fullscreen support by vendor prefix
-            for (var i = 0, il = browserPrefixes.length; i < il; i++ ) {
-                fullScreenApi.prefix = browserPrefixes[i];
-     
-                if (typeof document[fullScreenApi.prefix + 'CancelFullScreen' ] != 'undefined' ) {
-                    fullScreenApi.supportsFullScreen = true;
-     
-                    break;
-                }
-            }
-        }
-     
-        // update methods to do something useful
-        if (fullScreenApi.supportsFullScreen) {
-            fullScreenApi.fullScreenEventName = fullScreenApi.prefix + 'fullscreenchange';
-     
-            fullScreenApi.isFullScreen = function() {
-                switch (this.prefix) {
-                    case '':
-                        return document.fullScreen;
-                    case 'webkit':
-                        return document.webkitIsFullScreen;
-                    default:
-                        return document[this.prefix + 'FullScreen'];
-                }
-            };
-            fullScreenApi.requestFullScreen = function( element ) {
-                return (this.prefix === '') ? 
-                    element.requestFullScreen() : 
-                    element[this.prefix + 'RequestFullScreen']();
-
-            };
-            fullScreenApi.cancelFullScreen = function( element ) {
-                return (this.prefix === '') ? 
-                    document.cancelFullScreen() : 
-                    document[this.prefix + 'CancelFullScreen']();
-            };
-        } else if ( typeof window.ActiveXObject !== "undefined" ){
-            // Older IE.
-            fullScreenApi.requestFullScreen = function(){
-                var wscript = new ActiveXObject("WScript.Shell");
-                if ( wscript !== null ) {
-                    wscript.SendKeys("{F11}");
-                }
-                return false;
-            };
-            fullScreenApi.cancelFullScreen = fullScreenApi.requestFullScreen;
-        }
-
-     
-        // export api
-        $.extend( $, fullScreenApi );
-
-    })();
 
 
     //TODO: $.console is often used inside a try/catch block which generally