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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
/* eslint-env browser */
"use strict";
(function () {
const { require } = ChromeUtils.importESModule(
);
const {
gDevTools,
const {
appendStyleSheet,
const {
getTheme,
getAutoTheme,
addThemeObserver,
removeThemeObserver,
const documentElement = document.documentElement;
let os;
const platform = navigator.platform;
if (platform.startsWith("Win")) {
os = "win";
} else if (platform.startsWith("Mac")) {
os = "mac";
} else {
os = "linux";
}
documentElement.setAttribute("platform", os);
// no-theme attributes allows to just est the platform attribute
// to have per-platform CSS working correctly.
if (documentElement.getAttribute("no-theme") === "true") {
return;
}
const devtoolsStyleSheets = new WeakMap();
let gOldTheme = "";
/*
* Notify the window that a theme switch finished so tests can check the DOM
*/
function notifyWindow() {
window.dispatchEvent(new CustomEvent("theme-switch-complete", {}));
}
/*
* Apply all the sheets from `newTheme` and remove all of the sheets
* from `oldTheme`
*/
function switchTheme(newTheme) {
if (newTheme === gOldTheme) {
return;
}
const oldTheme = gOldTheme;
gOldTheme = newTheme;
const oldThemeDef = gDevTools.getThemeDefinition(oldTheme);
let newThemeDef = gDevTools.getThemeDefinition(newTheme);
// The theme might not be available anymore (e.g. uninstalled)
// Use the default one.
if (!newThemeDef) {
newThemeDef = gDevTools.getThemeDefinition(getAutoTheme());
}
// Store the sheets in a WeakMap for access later when the theme gets
// unapplied. It's hard to query for processing instructions so this
// is an easy way to access them later without storing a property on
// the window
devtoolsStyleSheets.set(newThemeDef, []);
const loadEvents = [];
for (const url of newThemeDef.stylesheets) {
const { styleSheet, loadPromise } = appendStyleSheet(document, url);
devtoolsStyleSheets.get(newThemeDef).push(styleSheet);
loadEvents.push(loadPromise);
}
Promise.all(loadEvents).then(() => {
// Unload all stylesheets and classes from the old theme.
if (oldThemeDef) {
for (const name of oldThemeDef.classList) {
documentElement.classList.remove(name);
}
for (const sheet of devtoolsStyleSheets.get(oldThemeDef) || []) {
sheet.remove();
}
if (oldThemeDef.onUnapply) {
oldThemeDef.onUnapply(window, newTheme);
}
}
// Load all stylesheets and classes from the new theme.
for (const name of newThemeDef.classList) {
documentElement.classList.add(name);
}
if (newThemeDef.onApply) {
newThemeDef.onApply(window, oldTheme);
}
// Final notification for further theme-switching related logic.
gDevTools.emit("theme-switched", window, newTheme, oldTheme);
notifyWindow();
}, console.error);
}
function handleThemeChange() {
switchTheme(getTheme());
}
// Check if the current document or the embedder of the document enforces a
// theme.
const forcedTheme =
documentElement.getAttribute("force-theme") ||
window.top.document.documentElement.getAttribute("force-theme");
if (forcedTheme) {
switchTheme(forcedTheme);
} else {
switchTheme(getTheme());
addThemeObserver(handleThemeChange);
window.addEventListener(
"unload",
function () {
removeThemeObserver(handleThemeChange);
},
{ once: true }
);
}
})();