mirror of https://github.com/zulip/zulip.git
102 lines
3.0 KiB
JavaScript
102 lines
3.0 KiB
JavaScript
var night_mode = (function () {
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var exports = {};
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var create_stylesheet = function () {
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var stylesheet = document.createElement('style');
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stylesheet.type = "text/css";
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stylesheet.classList.add("night-mode-stylesheet");
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// disable the stylesheet by default in case the user isn't running night mode.
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stylesheet.disabled = true;
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return stylesheet;
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};
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// this transforms an object into CSS. The top level keys of the object are
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// the CSS selectors and the second level keys are attributes which should have
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// valid CSS values.
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//
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// EXAMPLE:
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//
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// {
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// h1: { // h1 {
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// color: "red", // color: red;
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// }, // }
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// p: { // p {
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// "font-size": "1em", // font-size: 1em;
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// "line-spacing": 1.2, // line-spacing: 1.2;
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// }, // }
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// }
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//
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// All CSS selectors are supported, everything from `h1` to
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// complex selectors like `.night:not(.test)::after`.
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var object_to_css = function (object) {
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var css = "";
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// for each CSS selector.
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for (var selector in object) {
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// ensure the object properties are its own and not ones injected into
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// the Object.prototype.
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if (object.hasOwnProperty(selector)) {
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// create the `h1 {` line...
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css += selector + " {";
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// and for each of the properties of the selector...
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for (var attr in object[selector]) {
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if (object[selector].hasOwnProperty(attr)) {
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// add the attribute and its value like `attr: value;`.
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css += "\n\t" + attr + ": " + object[selector][attr] + ";";
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}
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}
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css += "\n}\n";
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}
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}
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// trim the excess newline.
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return css.trim();
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};
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(function () {
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// the object to be converted to CSS.
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// this should ONLY be used if there is no obvious way to perform this action
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// by prefixing the selector with `body.night-mode`.
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var css_skeleton = {
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"a:hover": {
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color: "#65c0ed",
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},
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};
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// create a stylesheet that can be appended to the <head>.
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var stylesheet = create_stylesheet();
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// convert to CSS.
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var css = object_to_css(css_skeleton);
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if (stylesheet.styleSheet) {
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stylesheet.styleSheet.cssText = css;
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} else {
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stylesheet.appendChild(document.createTextNode(css));
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}
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// append the stylesheet.
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(document.head || document.getElementsByTagName('head')[0]).appendChild(stylesheet);
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exports.enable = function () {
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// we can also query for this in the DOM with the
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// `.night-mode-stylesheet` class.
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stylesheet.disabled = false;
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$("body").addClass("night-mode");
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};
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exports.disable = function () {
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stylesheet.disabled = true;
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$("body").removeClass("night-mode");
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};
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}());
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return exports;
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}());
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if (typeof module !== 'undefined') {
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module.exports = night_mode;
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}
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window.night_mode = night_mode;
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