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79 lines
2.7 KiB
JavaScript
79 lines
2.7 KiB
JavaScript
/*****************************************************************************
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* Open MCT, Copyright (c) 2014-2017, 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(['zepto'], function ($) {
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/**
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* @typedef Context
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* @property {*} item
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* @property {HTMLElement} element
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* @property {Context} parent the containing context (may be undefined)
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* @memberof module:openmct
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*/
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function ContextManager() {
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this.counter = 0;
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this.contexts = {};
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}
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ContextManager.prototype.nextId = function () {
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this.counter += 1;
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return "context-" + this.counter;
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};
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ContextManager.prototype.context = function (item, htmlElement) {
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var $element = $(htmlElement);
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var id = $element.attr('data-context') || this.nextId();
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$element.attr('data-context', id);
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if (this.contexts[id] && this.contexts[id].item !== item) {
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this.release(htmlElement);
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}
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if (!this.contexts[id]) {
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var $parent = $element.closest('[data-context]');
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var parentId = $parent.attr('data-context');
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var parentContext = parentId ? this.contexts[parentId] : undefined;
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this.contexts[id] = {
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item: item,
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element: htmlElement,
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parent: parentContext
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};
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}
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return this.contexts[id];
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};
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ContextManager.prototype.release = function (htmlElement) {
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var $element = $(htmlElement);
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var id = $element.attr('data-context');
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if (id) {
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delete this.contexts[id];
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$element.removeAttr('data-context');
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}
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};
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return ContextManager;
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});
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