зеркало из https://github.com/mozilla/gecko-dev.git
106 строки
2.8 KiB
JavaScript
106 строки
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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{
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function _isTextColorDark(r, g, b) {
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return (0.2125 * r + 0.7154 * g + 0.0721 * b) <= 110;
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}
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const inContentVariableMap = [
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["--newtab-background-color", {
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lwtProperty: "ntp_background"
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}],
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["--newtab-text-primary-color", {
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lwtProperty: "ntp_text",
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processColor(rgbaChannels, element) {
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if (!rgbaChannels) {
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element.removeAttribute("lwt-newtab");
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element.removeAttribute("lwt-newtab-brighttext");
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return null;
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}
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element.setAttribute("lwt-newtab", "true");
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const {r, g, b, a} = rgbaChannels;
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if (!_isTextColorDark(r, g, b)) {
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element.setAttribute("lwt-newtab-brighttext", "true");
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}
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return `rgba(${r}, ${g}, ${b}, ${a})`;
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},
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}],
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];
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/**
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* ContentThemeController handles theme updates sent by the frame script.
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* To be able to use ContentThemeController, you must add your page to the whitelist
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* in LightweightThemeChildListener.jsm
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*/
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const ContentThemeController = {
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/**
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* Tell the frame script that the page supports theming, and watch for updates
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* from the frame script.
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*/
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init() {
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addEventListener("LightweightTheme:Set", this);
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},
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/**
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* Handle theme updates from the frame script.
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* @param {Object} event object containing the theme update.
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*/
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handleEvent({ type, detail }) {
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if (type == "LightweightTheme:Set") {
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let {data} = detail;
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if (!data) {
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data = {};
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}
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this._setProperties(document.body, data);
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}
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},
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/**
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* Set a CSS variable to a given value
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* @param {Element} elem The element where the CSS variable should be added.
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* @param {string} variableName The CSS variable to set.
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* @param {string} value The new value of the CSS variable.
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*/
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_setProperty(elem, variableName, value) {
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if (value) {
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elem.style.setProperty(variableName, value);
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} else {
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elem.style.removeProperty(variableName);
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}
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},
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/**
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* Apply theme data to an element
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* @param {Element} root The element where the properties should be applied.
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* @param {Object} themeData The theme data.
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*/
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_setProperties(elem, themeData) {
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for (let [cssVarName, definition] of inContentVariableMap) {
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const {
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lwtProperty,
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processColor,
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} = definition;
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let value = themeData[lwtProperty];
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if (processColor) {
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value = processColor(value, document.body);
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} else if (value) {
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const {r, g, b, a} = value;
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value = `rgba(${r}, ${g}, ${b}, ${a})`;
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}
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this._setProperty(elem, cssVarName, value);
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}
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},
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};
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ContentThemeController.init();
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}
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