54 lines
1.9 KiB
JavaScript
54 lines
1.9 KiB
JavaScript
/**
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@license
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Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
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This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
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The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
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The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
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Code distributed by Google as part of the polymer project is also
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subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
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*/
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/*
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Example library for adding document-level styles to ShadyCSS
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After DOMContentLoaded, synchronously add all document document level styles.
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Then, start a MutationObserver for dynamically added styles.
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Caveat: ShadyCSS will add a `scope` attribute to styles it controls, so do not add those styles.
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*/
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(function() {
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'use strict';
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const CustomStyleInterface = window.ShadyCSS.CustomStyleInterface;
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function shouldAddDocumentStyle(n) {
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return n.nodeType === Node.ELEMENT_NODE && n.localName === 'style' && !n.hasAttribute('scope');
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}
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function handler(mxns) {
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for (let i = 0; i < mxns.length; i++) {
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let mxn = mxns[i];
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for (let j = 0; j < mxn.addedNodes.length; j++) {
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let n = mxn.addedNodes[j];
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if (shouldAddDocumentStyle(n)) {
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CustomStyleInterface.addCustomStyle(n);
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}
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}
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}
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}
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const observer = new MutationObserver(handler);
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document.addEventListener('DOMContentLoaded', () => {
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const candidates = document.querySelectorAll('custom-style');
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for (let i = 0; i < candidates.length; i++) {
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const candidate = candidates[i];
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if (shouldAddDocumentStyle(candidate)) {
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CustomStyleInterface.addCustomStyle(candidate);
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}
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}
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observer.observe(document, {childList: true, subtree: true});
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});
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window.documentStyleFlush = () => {handler(observer.takeRecords())};
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})(); |