From 3529625a6cd406883d12c69e4056ea2b7945f8c0 Mon Sep 17 00:00:00 2001
From: Jermolene <jeremy@osmosoft.com>
Date: Sun, 3 Aug 2014 12:35:53 +0100
Subject: [PATCH] Fix full screen button not supported

---
 core/modules/startup/rootwidget.js | 17 +++++++++--------
 core/modules/utils/dom/browser.js  |  9 +++++++--
 2 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/core/modules/startup/rootwidget.js b/core/modules/startup/rootwidget.js
index 2cae33040..222950825 100644
--- a/core/modules/startup/rootwidget.js
+++ b/core/modules/startup/rootwidget.js
@@ -67,14 +67,15 @@ exports.startup = function() {
 		});
 	});
 	var fullscreen = $tw.utils.getFullScreenApis();
-	$tw.rootWidget.addEventListener("tw-full-screen",function(event) {
-		if(document[fullscreen._fullscreenElement]) {
-			document[fullscreen._exitFullscreen]();
-		} else {
-			document.documentElement[fullscreen._requestFullscreen](Element.ALLOW_KEYBOARD_INPUT);
-		}
-	});
-
+	if(fullscreen) {
+		$tw.rootWidget.addEventListener("tw-full-screen",function(event) {
+			if(document[fullscreen._fullscreenElement]) {
+				document[fullscreen._exitFullscreen]();
+			} else {
+				document.documentElement[fullscreen._requestFullscreen](Element.ALLOW_KEYBOARD_INPUT);
+			}
+		});
+	}
 	// If we're being viewed on a data: URI then give instructions for how to save
 	if(document.location.protocol === "data:") {
 		$tw.rootWidget.dispatchEvent({
diff --git a/core/modules/utils/dom/browser.js b/core/modules/utils/dom/browser.js
index 5c397a065..090d5768b 100644
--- a/core/modules/utils/dom/browser.js
+++ b/core/modules/utils/dom/browser.js
@@ -135,8 +135,8 @@ Return the names of the fullscreen APIs
 */
 exports.getFullScreenApis = function() {
 	var d = document,
-		db = d.body;
-	return {
+		db = d.body,
+		result = {
 		"_requestFullscreen": db.webkitRequestFullscreen !== undefined ? "webkitRequestFullscreen" :
 							db.mozRequestFullScreen !== undefined ? "mozRequestFullScreen" :
 							db.msRequestFullscreen !== undefined ? "msRequestFullscreen" :
@@ -150,6 +150,11 @@ exports.getFullScreenApis = function() {
 							d.msFullscreenElement !== undefined ? "msFullscreenElement" :
 							d.fullscreenElement !== undefined ? "fullscreenElement" : ""
 	};
+	if(!result._requestFullscreen || !result._exitFullscreen || !result._fullscreenElement) {
+		return null;
+	} else {
+		return result;
+	}
 };
 
 })();