99 lines
3.6 KiB
JavaScript
99 lines
3.6 KiB
JavaScript
/*****************************************************************************
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* Open MCT Web, Copyright (c) 2014-2015, United States Government
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* as represented by the Administrator of the National Aeronautics and Space
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* Administration. All rights reserved.
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*
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* Open MCT Web is licensed under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0.
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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* Open MCT Web includes source code licensed under additional open source
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* licenses. See the Open Source Licenses file (LICENSES.md) included with
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* this source code distribution or the Licensing information page available
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* at runtime from the About dialog for additional information.
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*****************************************************************************/
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/*global define,Promise*/
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/**
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* Module defining NavigationService. Created by vwoeltje on 11/10/14.
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*/
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define(
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[],
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function () {
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"use strict";
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/**
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* The navigation service maintains the application's current
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* navigation state, and allows listening for changes thereto.
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* @constructor
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*/
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function NavigationService() {
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var navigated,
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callbacks = [];
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// Getter for current navigation
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function getNavigation() {
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return navigated;
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}
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// Setter for navigation; invokes callbacks
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function setNavigation(value) {
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if (navigated !== value) {
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navigated = value;
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callbacks.forEach(function (callback) {
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callback(value);
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});
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}
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}
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// Adds a callback
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function addListener(callback) {
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callbacks.push(callback);
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}
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// Filters out a callback
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function removeListener(callback) {
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callbacks = callbacks.filter(function (cb) {
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return cb !== callback;
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});
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}
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return {
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/**
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* Get the current navigation state.
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*/
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getNavigation: getNavigation,
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/**
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* Set the current navigation state. Thiswill invoke listeners.
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* @param {DomainObject} value the domain object to navigate
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* to
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*/
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setNavigation: setNavigation,
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/**
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* Listen for changes in navigation. The passed callback will
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* be invoked with the new domain object of navigation when
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* this changes.
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* @param {function} callback the callback to invoke when
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* navigation state changes
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*/
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addListener: addListener,
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/**
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* Stop listening for changes in navigation state.
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* @param {function} callback the callback which should
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* no longer be invoked when navigation state
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* changes
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*/
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removeListener: removeListener
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};
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}
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return NavigationService;
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}
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); |