[Tree] Continue breaking apart tree view

platform/commonUI/general/src/ui/ToggleView.js

@@ -0,0 +1,61 @@
+/*****************************************************************************
+ * Open MCT Web, Copyright (c) 2014-2015, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT Web is licensed under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * Open MCT Web includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+/*global define*/
+
+define([
+    'angular',
+    'text!../../res/templates/ui/toggle.html'
+], function (angular, toggleTemplate) {
+    function ToggleView(state) {
+        this.expanded = !!state;
+        this.callbacks = [];
+        this.el = angular.element(toggleTemplate);
+        this.el.on('click', function () {
+            this.model(!this.expanded);
+        }.bind(this));
+    }
+
+    ToggleView.prototype.model = function (state) {
+        this.expanded = state;
+
+        if (state) {
+            this.el.addClass('expanded');
+        } else {
+            this.el.removeClass('expanded');
+        }
+
+        this.callbacks.forEach(function (callback) {
+            callback(state);
+        });
+    };
+
+    ToggleView.prototype.observe = function (callback) {
+        this.callbacks.push(callback);
+        return function () {
+            this.callbacks = this.callbacks.filter(function (c) {
+                return c !== callback;
+            });
+        }.bind(this);
+    };
+
+    return ToggleView;
+});