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766ed60ab0
It appears for the sidebar document, this.contentWindow.top is null at the time of DOMContentLoaded. Accordingly we need to wait for pageshow. This patch waits for pageshow and ensures we don't update twice when pageshow shows up if we successfully updated on DOMContentLoaded. Differential Revision: https://phabricator.services.mozilla.com/D112124
86 lines
2.4 KiB
JavaScript
86 lines
2.4 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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var EXPORTED_SYMBOLS = ["LightweightThemeChild"];
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const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
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/**
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* LightweightThemeChild forwards theme data to in-content pages.
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* It is both instantiated by the traditional Actor mechanism,
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* and also manually within the sidebar JS global (which has no message manager).
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* The manual instantiation is necessary due to Bug 1596852.
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*/
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class LightweightThemeChild extends JSWindowActorChild {
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constructor() {
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super();
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this._initted = false;
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Services.cpmm.sharedData.addEventListener("change", this);
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}
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didDestroy() {
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Services.cpmm.sharedData.removeEventListener("change", this);
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}
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_getChromeOuterWindowID() {
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try {
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// Getting the browserChild throws an exception when it is null.
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let browserChild = this.docShell.browserChild;
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if (browserChild) {
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return browserChild.chromeOuterWindowID;
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}
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} catch (ex) {}
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// We don't have a message manager, so presumable we're running in a sidebar
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// in the parent process.
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return this.contentWindow.top?.docShell?.outerWindowID;
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}
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/**
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* Handles "change" events on the child sharedData map, and notifies
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* our content page if its theme data was among the changed keys.
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*/
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handleEvent(event) {
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switch (event.type) {
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// Make sure to update the theme data on first page show.
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case "pageshow":
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case "DOMContentLoaded":
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if (!this._initted && this._getChromeOuterWindowID()) {
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this._initted = true;
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this.update();
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}
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break;
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case "change":
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if (
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event.changedKeys.includes(`theme/${this._getChromeOuterWindowID()}`)
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) {
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this.update();
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}
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break;
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}
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}
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/**
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* Forward the theme data to the page.
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*/
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update() {
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const event = Cu.cloneInto(
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{
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detail: {
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data: Services.cpmm.sharedData.get(
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`theme/${this._getChromeOuterWindowID()}`
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),
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},
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},
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this.contentWindow
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);
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this.contentWindow.dispatchEvent(
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new this.contentWindow.CustomEvent("LightweightTheme:Set", event)
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);
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}
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}
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