73 lines
1.8 KiB
TypeScript
73 lines
1.8 KiB
TypeScript
// Copyright 2021 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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/* eslint-disable no-restricted-syntax */
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import type { NativeThemeState } from '../types/NativeThemeNotifier.d';
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export type Callback = (change: NativeThemeState) => void;
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export interface MinimalIPC {
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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send(channel: string, ...args: ReadonlyArray<any>): void;
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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sendSync(channel: string): any;
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on(
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channel: string,
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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listener: (event: unknown, ...args: ReadonlyArray<any>) => void
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): this;
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}
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type SystemThemeType = 'dark' | 'light';
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export type SystemThemeHolder = { systemTheme: SystemThemeType };
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export type NativeThemeType = {
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getSystemTheme: () => SystemThemeType;
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subscribe: (fn: Callback) => void;
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update: () => SystemThemeType;
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};
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export function createNativeThemeListener(
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ipc: MinimalIPC,
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holder: SystemThemeHolder
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): NativeThemeType {
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const subscribers = new Array<Callback>();
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let theme = ipc.sendSync('native-theme:init');
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let systemTheme: SystemThemeType;
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function update(): SystemThemeType {
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const nextSystemTheme = theme.shouldUseDarkColors ? 'dark' : 'light';
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// eslint-disable-next-line no-param-reassign
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holder.systemTheme = nextSystemTheme;
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return nextSystemTheme;
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}
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function subscribe(fn: Callback): void {
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subscribers.push(fn);
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}
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ipc.on(
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'native-theme:changed',
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(_event: unknown, change: NativeThemeState) => {
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theme = change;
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systemTheme = update();
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for (const fn of subscribers) {
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fn(change);
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}
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}
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);
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systemTheme = update();
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return {
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getSystemTheme: () => systemTheme,
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subscribe,
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update,
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};
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}
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