[Forms] Add CompositeController

Add a controller for composite controls; this is used
to flag contained controls as required when they have
been partially filled in (to treat entering one of two
such fields as invalid.) WTD-593.

platform/forms/bundle.json

@@ -40,6 +40,10 @@
                 "key": "DateTimeController",
                 "implementation": "controllers/DateTimeController.js",
                 "depends": [ "$scope" ]
+            },
+            {
+                "key": "CompositeController",
+                "implementation": "controllers/CompositeController.js"
             }
         ],
         "templates": [

platform/forms/res/templates/controls/composite.html

@@ -1,7 +1,8 @@
-<ng-form name="mctFormItem" ng-repeat="item in structure.items">
+<span ng-controller="CompositeController as compositeCtrl">
+    <ng-form name="mctFormItem" ng-repeat="item in structure.items">
         <mct-control key="item.control"
                      ng-model="ngModel[field]"
-                 ng-required="ngRequired"
+                     ng-required="ngRequired || compositeCtrl.isNonEmpty(ngModel[field])"
                      ng-pattern="ngPattern"
                      options="item.options"
                      structure="row"
@@ -10,4 +11,5 @@
         <span class="composite-control-label">
             {{item.name}}
         </span>
-</ng-form>
+    </ng-form>
+</span>

platform/forms/src/controllers/CompositeController.js

@@ -0,0 +1,27 @@
+/*global define*/
+
+define(
+    [],
+    function () {
+        "use strict";
+
+        function CompositeController() {
+            function isDefined(element) {
+                return typeof element !== 'undefined';
+            }
+
+            function or(a, b) {
+                return a || b;
+            }
+
+            return {
+                isNonEmpty: function (value) {
+                    return (value || []).map(isDefined).reduce(or, false);
+                }
+            };
+        }
+
+        return CompositeController;
+
+    }
+);