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import * as tinycolor from 'tinycolor2';
export type Theme = {
id: string;
name: string;
author: string;
desc?: string;
base?: 'dark' | 'light';
props: { [key: string]: string };
};
export const lightTheme: Theme = require('./themes/_light.json5');
export const darkTheme: Theme = require('./themes/_dark.json5');
export const builtinThemes = [
require('./themes/white.json5'),
require('./themes/black.json5'),
require('./themes/lavender.json5'),
require('./themes/halloween.json5'),
require('./themes/garden.json5'),
require('./themes/mauve.json5'),
require('./themes/elegant.json5'),
require('./themes/rainy.json5'),
require('./themes/urban.json5'),
require('./themes/cafe.json5'),
require('./themes/chocolate.json5'),
require('./themes/danboard.json5'),
require('./themes/olive.json5'),
require('./themes/tweetdeck.json5'),
];
let timeout = null;
export function applyTheme(theme: Theme, persist = true) {
if (timeout) clearTimeout(timeout);
document.documentElement.classList.add('changing-theme');
timeout = setTimeout(() => {
document.documentElement.classList.remove('changing-theme');
}, 1000);
// Deep copy
const _theme = JSON.parse(JSON.stringify(theme));
if (_theme.base) {
const base = [lightTheme, darkTheme].find(x => x.id == _theme.base);
_theme.props = Object.assign({}, base.props, _theme.props);
}
const props = compile(_theme);
for (const tag of document.head.children) {
if (tag.tagName === 'META' && tag.getAttribute('name') === 'theme-color') {
tag.setAttribute('content', props['html']);
break;
}
}
for (const [k, v] of Object.entries(props)) {
document.documentElement.style.setProperty(`--${k}`, v.toString());
}
if (persist) {
localStorage.setItem('theme', JSON.stringify(props));
}
}
function compile(theme: Theme): { [key: string]: string } {
function getColor(code: string): tinycolor.Instance {
// ref
if (code[0] == '@') {
return getColor(theme.props[code.substr(1)]);
}
// func
if (code[0] == ':') {
const parts = code.split('<');
const func = parts.shift().substr(1);
const arg = parseFloat(parts.shift());
const color = getColor(parts.join('<'));
switch (func) {
case 'darken': return color.darken(arg);
case 'lighten': return color.lighten(arg);
case 'alpha': return color.setAlpha(arg);
}
}
return tinycolor(code);
}
const props = {};
for (const [k, v] of Object.entries(theme.props)) {
props[k] = genValue(getColor(v));
}
return props;
}
function genValue(c: tinycolor.Instance): string {
return c.toRgbString();
}
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