Added code to check for screensharing support.

html/main.html

@@ -23,7 +23,7 @@
             <ul class="nav navbar-nav navbar-right right">
                 <li class="ng-cloak">
                     <button title="{{_('Present a file')}}" class="btn aenablebtn" ng-show="status=='connected' || status=='conference' || layout.presentation" ng-model="layout.presentation" btn-checkbox><i class="fa fa-folder-open-o"></i></button>
-                    <button title="{{_('Share your screen')}}" class="btn aenablebtn" ng-show="isChrome && webrtcDetectedVersion >= 32 && (status=='connected' || status=='conference' || layout.screenshare)" ng-model="layout.screenshare" btn-checkbox><i class="fa fa-desktop"></i></button>
+                    <button title="{{_('Share your screen')}}" class="btn aenablebtn" ng-disabled="!supported.screensharing" ng-show="status=='connected' || status=='conference' || layout.screenshare" ng-model="layout.screenshare" btn-checkbox><i class="fa fa-desktop"></i></button>
                     <button title="{{_('Chat')}}" class="btn" ng-class="{messagesunseen: chatMessagesUnseen>0}" ng-model="layout.chat" btn-checkbox btn-checkbox-true="true" btn-checkbox-false="false"><i class="fa fa-comments-o"></i><span class="badge" ng-show="chatMessagesUnseen" ng-bind="chatMessagesUnseen"></span></button>
                     <button title="{{_('Mute microphone')}}" class="btn amutebtn" ng-model="microphoneMute" btn-checkbox btn-checkbox-true="true" btn-checkbox-false="false"><i class="fa fa-microphone-slash"></i></button>
                     <button title="{{_('Turn camera off')}}" class="btn amutebtn" ng-model="cameraMute" btn-checkbox btn-checkbox-true="true" btn-checkbox-false="false"><i class="fa fa-eye-slash"></i></button>

static/js/controllers/mediastreamcontroller.js

@@ -20,7 +20,7 @@
  */
 define(['underscore', 'bigscreen', 'moment', 'sjcl', 'modernizr', 'webrtc.adapter'], function(_, BigScreen, moment, sjcl, Modernizr) {
 
-	return ["$scope", "$rootScope", "$element", "$window", "$timeout", "safeDisplayName", "safeApply", "mediaStream", "appData", "playSound", "desktopNotify", "alertify", "toastr", "translation", "fileDownload", "localStorage", function($scope, $rootScope, $element, $window, $timeout, safeDisplayName, safeApply, mediaStream, appData, playSound, desktopNotify, alertify, toastr, translation, fileDownload, localStorage) {
+	return ["$scope", "$rootScope", "$element", "$window", "$timeout", "safeDisplayName", "safeApply", "mediaStream", "appData", "playSound", "desktopNotify", "alertify", "toastr", "translation", "fileDownload", "localStorage", "screensharing", function($scope, $rootScope, $element, $window, $timeout, safeDisplayName, safeApply, mediaStream, appData, playSound, desktopNotify, alertify, toastr, translation, fileDownload, localStorage, screensharing) {
 
 		/*console.log("route", $route, $routeParams, $location);*/
 
@@ -119,6 +119,11 @@ define(['underscore', 'bigscreen', 'moment', 'sjcl', 'modernizr', 'webrtc.adapte
 		$scope.webrtcDetectedBrowser = $window.webrtcDetectedBrowser;
 		$scope.webrtcDetectedVersion = $window.webrtcDetectedVersion;
 
+		// Add support status.
+		$scope.supported = {
+			screensharing: screensharing.supported
+		}
+
 		// Default scope data.
 		$scope.status = "initializing";
 		$scope.id = null;

static/js/services/screensharing.js

@@ -0,0 +1,51 @@
+/*
+ * Spreed WebRTC.
+ * Copyright (C) 2013-2014 struktur AG
+ *
+ * This file is part of Spreed WebRTC.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+define(['webrtc.adapter'], function() {
+
+	// screensharing
+	return ["$window", function($window) {
+
+		// Check if we can do screensharing.
+		var supported = false;
+		if ($window.webrtcDetectedBrowser === "chrome") {
+			if ($window.webrtcDetectedVersion >= 32 &&
+				$window.webrtcDetectedVersion < 37) {
+				// Support for flag based developer screen sharing came in Chrome 32.
+				// It was removed in Chrome 37 in favour of chrome.chooseDesktopMedia
+				// https://code.google.com/p/chromium/issues/detail?id=347641
+				supported = true;
+			} else if ($window.webrtcDetectedVersion >= 37) {
+				// We need a extension to support screen sharing. See
+				// https://developer.chrome.com/extensions/desktopCapture#method-chooseDesktopMedia
+				// for details.
+			}
+		} else {
+			// Currently Chrome only.
+		}
+
+		// public API.
+		return {
+			supported: supported
+		}
+
+	}];
+
+});

static/js/services/services.js

@@ -51,7 +51,8 @@ define([
 	'services/localstorage',
 	'services/animationframe',
 	'services/dialogs',
-	'services/geolocation'], function(_,
+	'services/geolocation',
+	'services/screensharing'], function(_,
 desktopNotify,
 playSound,
 safeApply,
@@ -82,7 +83,8 @@ buddySession,
 localStorage,
 animationFrame,
 dialogs,
-geolocation) {
+geolocation,
+screensharing) {
 
 	var services = {
 		desktopNotify: desktopNotify,
@@ -115,7 +117,8 @@ geolocation) {
 		localStorage: localStorage,
 		animationFrame: animationFrame,
 		dialogs: dialogs,
-		geolocation: geolocation
+		geolocation: geolocation,
+		screensharing: screensharing
 	};
 
 	var initialize = function(angModule) {