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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";
{
const prefersDarkQuery = window.matchMedia("(prefers-color-scheme: dark)");
function _isTextColorDark(r, g, b) {
return 0.2125 * r + 0.7154 * g + 0.0721 * b <= 110;
}
const inContentVariableMap = [
[
"--newtab-background-color",
{
lwtProperty: "ntp_background",
processColor(rgbaChannels) {
if (!rgbaChannels) {
return null;
}
const { r, g, b } = rgbaChannels;
// Drop alpha channel
return `rgb(${r}, ${g}, ${b})`;
},
},
],
[
"--newtab-background-color-secondary",
{
lwtProperty: "ntp_card_background",
},
],
[
"--newtab-text-primary-color",
{
lwtProperty: "ntp_text",
processColor(rgbaChannels, element) {
// We only have access to the browser when we're in a chrome
// docshell, so for now only set the color scheme in that case, and
// use the `lwt-newtab-brighttext` attribute as a fallback mechanism.
let browserStyle =
element.ownerGlobal?.docShell?.chromeEventHandler.style;
if (!rgbaChannels) {
element.removeAttribute("lwt-newtab");
element.toggleAttribute(
"lwt-newtab-brighttext",
prefersDarkQuery.matches
);
if (browserStyle) {
browserStyle.colorScheme = "";
}
return null;
}
element.setAttribute("lwt-newtab", "true");
const { r, g, b, a } = rgbaChannels;
let darkMode = !_isTextColorDark(r, g, b);
element.toggleAttribute("lwt-newtab-brighttext", darkMode);
if (browserStyle) {
browserStyle.colorScheme = darkMode ? "dark" : "light";
}
return `rgba(${r}, ${g}, ${b}, ${a})`;
},
},
],
[
"--in-content-zap-gradient",
{
lwtProperty: "zap_gradient",
processColor(value) {
return value;
},
},
],
[
"--lwt-sidebar-background-color",
{
lwtProperty: "sidebar",
processColor(rgbaChannels) {
if (!rgbaChannels) {
return null;
}
const { r, g, b } = rgbaChannels;
// Drop alpha channel
return `rgb(${r}, ${g}, ${b})`;
},
},
],
[
"--lwt-sidebar-text-color",
{
lwtProperty: "sidebar_text",
processColor(rgbaChannels, element) {
if (!rgbaChannels) {
element.removeAttribute("lwt-sidebar");
return null;
}
// TODO(emilio): Can we share this code somehow with LightWeightThemeConsumer?
const { r, g, b, a } = rgbaChannels;
element.setAttribute(
"lwt-sidebar",
_isTextColorDark(r, g, b) ? "light" : "dark"
);
return `rgba(${r}, ${g}, ${b}, ${a})`;
},
},
],
[
"--lwt-sidebar-highlight-background-color",
{
lwtProperty: "sidebar_highlight",
processColor(rgbaChannels, element) {
if (!rgbaChannels) {
element.removeAttribute("lwt-sidebar-highlight");
return null;
}
element.setAttribute("lwt-sidebar-highlight", "true");
const { r, g, b, a } = rgbaChannels;
return `rgba(${r}, ${g}, ${b}, ${a})`;
},
},
],
[
"--lwt-sidebar-highlight-text-color",
{
lwtProperty: "sidebar_highlight_text",
},
],
];
/**
* ContentThemeController handles theme updates sent by the frame script.
* To be able to use ContentThemeController, you must add your page to the whitelist
* in LightweightThemeChild.sys.mjs
*/
const ContentThemeController = {
/**
* Listen for theming updates from the LightweightThemeChild actor, and
* begin listening to changes in preferred color scheme.
*/
init() {
addEventListener("LightweightTheme:Set", this);
// We don't sync default theme attributes in `init()`, as we may not have
// a root element to attach the attribute to yet. They will be set when
// the first LightweightTheme:Set event is delivered during pageshow.
prefersDarkQuery.addEventListener("change", this);
},
/**
* Handle theme updates from the LightweightThemeChild actor or due to
* changes to the prefers-color-scheme media query.
* @param {Object} event object containing the theme or query update.
*/
handleEvent(event) {
const root = document.documentElement;
if (event.type == "LightweightTheme:Set") {
let { data } = event.detail;
if (!data) {
data = {};
}
this._setProperties(root, data);
} else if (event.type == "change") {
// If a lightweight theme doesn't apply, update lwt-newtab-brighttext to
// reflect prefers-color-scheme.
if (!root.hasAttribute("lwt-newtab")) {
root.toggleAttribute("lwt-newtab-brighttext", event.matches);
}
}
},
/**
* Set a CSS variable to a given value
* @param {Element} elem The element where the CSS variable should be added.
* @param {string} variableName The CSS variable to set.
* @param {string} value The new value of the CSS variable.
*/
_setProperty(elem, variableName, value) {
if (value) {
elem.style.setProperty(variableName, value);
} else {
elem.style.removeProperty(variableName);
}
},
/**
* Apply theme data to an element
* @param {Element} root The element where the properties should be applied.
* @param {Object} themeData The theme data.
*/
_setProperties(elem, themeData) {
for (let [cssVarName, definition] of inContentVariableMap) {
const { lwtProperty, processColor } = definition;
let value = themeData[lwtProperty];
if (processColor) {
value = processColor(value, elem);
} else if (value) {
const { r, g, b, a } = value;
value = `rgba(${r}, ${g}, ${b}, ${a})`;
}
this._setProperty(elem, cssVarName, value);
}
},
};
ContentThemeController.init();
}
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