101 lines
2.8 KiB
JavaScript
101 lines
2.8 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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this.EXPORTED_SYMBOLS = ["PageStyle"];
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const Ci = Components.interfaces;
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/**
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* The external API exported by this module.
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*/
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this.PageStyle = Object.freeze({
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collect: function (docShell, frameTree) {
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return PageStyleInternal.collect(docShell, frameTree);
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},
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restoreTree: function (docShell, data) {
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PageStyleInternal.restoreTree(docShell, data);
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}
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});
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// Signifies that author style level is disabled for the page.
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const NO_STYLE = "_nostyle";
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var PageStyleInternal = {
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/**
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* Collects the selected style sheet sets for all reachable frames.
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*/
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collect: function (docShell, frameTree) {
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let result = frameTree.map(({document: doc}) => {
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let style;
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if (doc) {
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// http://dev.w3.org/csswg/cssom/#persisting-the-selected-css-style-sheet-set
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style = doc.selectedStyleSheetSet || doc.lastStyleSheetSet;
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}
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return style ? {pageStyle: style} : null;
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});
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let markupDocumentViewer =
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docShell.contentViewer;
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if (markupDocumentViewer.authorStyleDisabled) {
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result = result || {};
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result.disabled = true;
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}
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return result && Object.keys(result).length ? result : null;
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},
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/**
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* Restores pageStyle data for the current frame hierarchy starting at the
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* |docShell's| current DOMWindow using the given pageStyle |data|.
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*
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* Warning: If the current frame hierarchy doesn't match that of the given
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* |data| object we will silently discard data for unreachable frames. We may
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* as well assign page styles to the wrong frames if some were reordered or
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* removed.
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*
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* @param docShell (nsIDocShell)
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* @param data (object)
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* {
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* disabled: true, // when true, author styles will be disabled
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* pageStyle: "Dusk",
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* children: [
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* null,
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* {pageStyle: "Mozilla", children: [ ... ]}
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* ]
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* }
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*/
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restoreTree: function (docShell, data) {
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let disabled = data.disabled || false;
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let markupDocumentViewer =
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docShell.contentViewer;
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markupDocumentViewer.authorStyleDisabled = disabled;
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function restoreFrame(root, data) {
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if (data.hasOwnProperty("pageStyle")) {
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root.document.selectedStyleSheetSet = data.pageStyle;
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}
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if (!data.hasOwnProperty("children")) {
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return;
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}
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let frames = root.frames;
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data.children.forEach((child, index) => {
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if (child && index < frames.length) {
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restoreFrame(frames[index], child);
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}
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});
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}
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let ifreq = docShell.QueryInterface(Ci.nsIInterfaceRequestor);
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restoreFrame(ifreq.getInterface(Ci.nsIDOMWindow), data);
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}
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};
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