[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/edit/src/actions/CancelAction.js

@@ -0,0 +1,51 @@
+/*global define*/
+
+/**
+ * The "Save" action; the action triggered by clicking Save from
+ * Edit Mode. Exits the editing user interface and invokes object
+ * capabilities to persist the changes that have been made.
+ */
+define(
+    function () {
+        'use strict';
+
+        function CancelAction($location, context) {
+            var domainObject = context.domainObject;
+
+            // Look up the object's "editor.completion" capability;
+            // this is introduced by EditableDomainObject which is
+            // used to insulate underlying objects from changes made
+            // during editing.
+            function getEditorCapability() {
+                return domainObject.getCapability("editor");
+            }
+
+            // Invoke any save behavior introduced by the editor.completion
+            // capability.
+            function doCancel(editor) {
+                return editor.cancel();
+            }
+
+            // Discard the current root view (which will be the editing
+            // UI, which will have been pushed atop the Browise UI.)
+            function returnToBrowse() {
+                $location.path("/browse");
+            }
+
+            return {
+                perform: function () {
+                    return doCancel(getEditorCapability())
+                        .then(returnToBrowse);
+                }
+            };
+        }
+
+        CancelAction.appliesTo = function (context) {
+            var domainObject = (context || {}).domainObject;
+            return domainObject !== undefined &&
+                domainObject.hasCapability("editor");
+        };
+
+        return CancelAction;
+    }
+);