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50a0db7113
MozReview-Commit-ID: 4MaGKbkyuZ9 --HG-- extra : rebase_source : 622115120ac1349b63175b6de088269e9f17e1ed
44 lines
1.5 KiB
JavaScript
44 lines
1.5 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* eslint-env browser */
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"use strict";
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/*
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* Append a stylesheet to the provided XUL document.
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*
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* @param {Document} xulDocument
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* The XUL document where the stylesheet should be appended.
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* @param {String} url
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* The url of the stylesheet to load.
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* @return {Object}
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* - styleSheet {XMLStylesheetProcessingInstruction} the instruction node created.
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* - loadPromise {Promise} that will resolve/reject when the stylesheet finishes
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* or fails to load.
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*/
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function appendStyleSheet(xulDocument, url) {
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let styleSheetAttr = `href="${url}" type="text/css"`;
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let styleSheet = xulDocument.createProcessingInstruction(
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"xml-stylesheet", styleSheetAttr);
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let loadPromise = new Promise((resolve, reject) => {
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function onload() {
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styleSheet.removeEventListener("load", onload);
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styleSheet.removeEventListener("error", onerror);
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resolve();
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}
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function onerror() {
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styleSheet.removeEventListener("load", onload);
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styleSheet.removeEventListener("error", onerror);
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reject("Failed to load theme file " + url);
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}
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styleSheet.addEventListener("load", onload);
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styleSheet.addEventListener("error", onerror);
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});
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xulDocument.insertBefore(styleSheet, xulDocument.documentElement);
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return {styleSheet, loadPromise};
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}
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exports.appendStyleSheet = appendStyleSheet;
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