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