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108 lines
3.1 KiB
JavaScript
108 lines
3.1 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
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* file, 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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* Colors for themes taken from:
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* https://developer.mozilla.org/en-US/docs/Tools/DevToolsColors
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*/
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const { Cu } = require("chrome");
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const { NetUtil } = Cu.import("resource://gre/modules/NetUtil.jsm", {});
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const Services = require("Services");
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const { gDevTools } = require("devtools/client/framework/devtools");
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const VARIABLES_URI = "chrome://devtools/skin/variables.css";
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const THEME_SELECTOR_STRINGS = {
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light: ":root.theme-light {",
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dark: ":root.theme-dark {"
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};
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let variableFileContents;
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/**
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* Returns a string of the file found at URI
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*/
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function readURI(uri) {
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let stream = NetUtil.newChannel({
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uri: NetUtil.newURI(uri, "UTF-8"),
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loadUsingSystemPrincipal: true}
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).open();
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let count = stream.available();
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let data = NetUtil.readInputStreamToString(stream, count, {
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charset: "UTF-8"
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});
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stream.close();
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return data;
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}
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/**
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* Takes a theme name and returns the contents of its variable rule block.
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* The first time this runs fetches the variables CSS file and caches it.
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*/
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function getThemeFile(name) {
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if (!variableFileContents) {
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variableFileContents = readURI(VARIABLES_URI);
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}
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// If there's no theme expected for this name, use `light` as default.
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let selector = THEME_SELECTOR_STRINGS[name] ||
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THEME_SELECTOR_STRINGS.light;
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// This is a pretty naive way to find the contents between:
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// selector {
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// name: val;
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// }
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// There is test coverage for this feature (browser_theme.js)
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// so if an } is introduced in the variables file it will catch that.
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let theme = variableFileContents;
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theme = theme.substring(theme.indexOf(selector));
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theme = theme.substring(0, theme.indexOf("}"));
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return theme;
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}
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/**
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* Returns the string value of the current theme,
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* like "dark" or "light".
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*/
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const getTheme = exports.getTheme = () => {
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return Services.prefs.getCharPref("devtools.theme");
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};
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/**
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* Returns a color indicated by `type` (like "toolbar-background", or
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* "highlight-red"), with the ability to specify a theme, or use whatever the
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* current theme is if left unset. If theme not found, falls back to "light"
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* theme. Returns null if the type cannot be found for the theme given.
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*/
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/* eslint-disable no-unused-vars */
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const getColor = exports.getColor = (type, theme) => {
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let themeName = theme || getTheme();
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let themeFile = getThemeFile(themeName);
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let match = themeFile.match(new RegExp("--theme-" + type + ": (.*);"));
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// Return the appropriate variable in the theme, or otherwise, null.
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return match ? match[1] : null;
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};
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/**
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* Mimics selecting the theme selector in the toolbox;
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* sets the preference and emits an event on gDevTools to trigger
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* the themeing.
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*/
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const setTheme = exports.setTheme = (newTheme) => {
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let oldTheme = getTheme();
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Services.prefs.setCharPref("devtools.theme", newTheme);
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gDevTools.emit("pref-changed", {
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pref: "devtools.theme",
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newValue: newTheme,
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oldValue: oldTheme
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});
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};
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/* eslint-enable */
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