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