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99 lines
3.7 KiB
JavaScript
99 lines
3.7 KiB
JavaScript
/*****************************************************************************
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* Open MCT, Copyright (c) 2014-2023, 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 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 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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define([], function () {
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const helperFunctions = {
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listenTo: function (object, event, callback, context) {
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if (!this._listeningTo) {
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this._listeningTo = [];
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}
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const listener = {
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object: object,
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event: event,
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callback: callback,
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context: context,
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_cb: context ? callback.bind(context) : callback
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};
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if (object.$watch && event.indexOf('change:') === 0) {
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const scopePath = event.replace('change:', '');
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listener.unlisten = object.$watch(scopePath, listener._cb, true);
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} else if (object.$on) {
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listener.unlisten = object.$on(event, listener._cb);
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} else if (object.addEventListener) {
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object.addEventListener(event, listener._cb);
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} else {
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object.on(event, listener._cb);
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}
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this._listeningTo.push(listener);
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},
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stopListening: function (object, event, callback, context) {
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if (!this._listeningTo) {
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this._listeningTo = [];
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}
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this._listeningTo.filter(function (listener) {
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if (object && object !== listener.object) {
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return false;
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}
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if (event && event !== listener.event) {
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return false;
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}
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if (callback && callback !== listener.callback) {
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return false;
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}
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if (context && context !== listener.context) {
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return false;
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}
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return true;
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})
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.map(function (listener) {
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if (listener.unlisten) {
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listener.unlisten();
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} else if (listener.object.removeEventListener) {
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listener.object.removeEventListener(listener.event, listener._cb);
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} else {
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listener.object.off(listener.event, listener._cb);
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}
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return listener;
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})
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.forEach(function (listener) {
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this._listeningTo.splice(this._listeningTo.indexOf(listener), 1);
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}, this);
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},
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extend: function (object) {
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object.listenTo = helperFunctions.listenTo;
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object.stopListening = helperFunctions.stopListening;
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}
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};
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return helperFunctions;
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});
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