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640fe52298
MozReview-Commit-ID: F6xUXCgdRE4 --HG-- extra : rebase_source : 65de1b0aba412d9044b5196115f74276caa058f2
98 lines
3.0 KiB
JavaScript
98 lines
3.0 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 Services = require("Services");
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const variableFileContents = require("theme-loader!devtools/client/themes/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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root: ":root {",
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};
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const THEME_PREF = "devtools.theme";
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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 there's no theme expected for this name, use `light` as default.
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const 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(THEME_PREF);
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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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const 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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const variableMatch = match ? match[1].match(/var\((.*)\)/) : null;
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// Check if the match is a color variable and retrieve the value of the color variable
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// if needed
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if (variableMatch) {
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themeFile = getThemeFile("root");
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match = themeFile.match(new RegExp(`${variableMatch[1]}: (.*);`));
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}
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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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* Set the theme preference.
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*/
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const setTheme = exports.setTheme = (newTheme) => {
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Services.prefs.setCharPref(THEME_PREF, newTheme);
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};
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/**
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* Add an observer for theme changes.
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*/
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const addThemeObserver = exports.addThemeObserver = observer => {
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Services.prefs.addObserver(THEME_PREF, observer);
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};
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/**
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* Remove an observer for theme changes.
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*/
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const removeThemeObserver = exports.removeThemeObserver = observer => {
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Services.prefs.removeObserver(THEME_PREF, observer);
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};
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/* eslint-enable */
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