[Common UI] Initial commonUI bundles

Bring in work on general-purpose and over-arching
user interface bundles from the sandbox transition
branch. WTD-574.

platform/commonUI/browse/src/windowing/FullscreenAction.js

@@ -0,0 +1,41 @@
+/*global define,screenfull,Promise*/
+
+/**
+ * Module defining FullscreenAction. Created by vwoeltje on 11/18/14.
+ */
+define(
+    ["../../lib/screenfull.min"],
+    function () {
+        "use strict";
+
+        var ENTER_FULLSCREEN = "Enter full screen mode.",
+            EXIT_FULLSCREEN = "Exit full screen mode.";
+
+        /**
+         *
+         * @constructor
+         */
+        function FullscreenAction(context) {
+            return {
+                perform: function () {
+                    screenfull.toggle();
+                },
+                getMetadata: function () {
+                    // We override getMetadata, because the glyph and
+                    // description need to be determined at run-time
+                    // based on whether or not we are currently
+                    // full screen.
+                    var metadata = Object.create(FullscreenAction);
+                    metadata.glyph = screenfull.isFullscreen ? "_" : "z";
+                    metadata.description = screenfull.isFullscreen ?
+                            EXIT_FULLSCREEN : ENTER_FULLSCREEN;
+                    metadata.group = "windowing";
+                    metadata.context = context;
+                    return metadata;
+                }
+            };
+        }
+
+        return FullscreenAction;
+    }
+);