shortcutter/jsnext/contexts.js

Tiny, dependency-free library to manage keyboard shortcuts in your application.

import { createContext } from './context';
const ERROR_NOT_ADDED = (name) => `Context '${name}' is not added.`;
const ERROR_ALREADY_ADDED = (name) => `Context '${name}' is already added.`;
export function useContexts() {
    const ACTIVE_CONTEXTS = new Set();
    const AVAILABLE_CONTEXTS = new Map();
    return {
        add(name) {
            if (AVAILABLE_CONTEXTS.has(name)) {
                throw new Error(ERROR_ALREADY_ADDED(name));
            }
            const shortcutContext = createContext(name);
            AVAILABLE_CONTEXTS.set(name, shortcutContext);
            return shortcutContext;
        },
        clear() {
            AVAILABLE_CONTEXTS.clear();
        },
        getActive() {
            return [...ACTIVE_CONTEXTS.values()];
        },
        get(name) {
            if (!AVAILABLE_CONTEXTS.has(name)) {
                throw new Error(ERROR_NOT_ADDED(name));
            }
            return AVAILABLE_CONTEXTS.get(name);
        },
        getAll() {
            return [...AVAILABLE_CONTEXTS.keys()];
        },
        has(name) {
            return AVAILABLE_CONTEXTS.has(name);
        },
        isActive(name) {
            return ACTIVE_CONTEXTS.has(name);
        },
        remove(name) {
            if (!AVAILABLE_CONTEXTS.has(name)) {
                throw new Error(ERROR_NOT_ADDED(name));
            }
            AVAILABLE_CONTEXTS.delete(name);
        },
        setActive(...contexts) {
            ACTIVE_CONTEXTS.clear();
            contexts.forEach((name) => {
                if (!AVAILABLE_CONTEXTS.has(name)) {
                    throw new Error(ERROR_NOT_ADDED(name));
                }
                ACTIVE_CONTEXTS.add(name);
            });
        },
    };
}