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const events = new Events(); * events.on('hello', wat => console.log(wat)); * events.trigger('hello', 'world'); * events.off('hello'); * events.dispose(); */ export default class Events { /** * Constructor. */ constructor() { this._events = new Map(); this._onQueue = []; this._offQueue = []; this._triggerDepth = 0; } /** * Destructor (disposes internal resources). * * @example * events.dispose(); * events = null; */ dispose() { this._events.clear(); this._onQueue = []; this._offQueue = []; this._triggerDepth = 0; } /** * Listen for given event. * * @param {string} name - Event name. * @param {Function} callback - Event callback. Arguments are passed here from trigger methods. * * @example * events.on('hello', wat => console.log(wat)); * events.trigger('hello', 'world'); */ on(name, callback) { if (typeof name !== 'string') { throw new Error('`name` is not type of String!'); } if (!(callback instanceof Function)) { throw new Error('`callback` is not type of Function!'); } const { _events, _triggerDepth, _onQueue } = this; if (_triggerDepth > 0) { _onQueue.push({ name, callback }); return; } if (!_events.has(name)) { _events.set(name, []); } _events.get(name).push(callback); } /** * Remove given callback from listeners of given event. * If callback is omitted, then all callbacks of given event are removed. * * @param {string} name - Event name. * @param {Function} callback - Event callback. * * @example * const cb = wat => console.log(wat); * events.on('hello', cb); * events.off('hello', cb); // remove callback. * events.off('hello'); // remove all callbacks. */ off(name, callback) { if (typeof name !== 'string') { throw new Error('`name` is not type of String!'); } const { _events, _triggerDepth, _offQueue } = this; if (!callback) { _events.delete(name); return; } if (!(callback instanceof Function)) { throw new Error('`callback` is not type of Function!'); } if (_triggerDepth > 0) { _offQueue.push({ name, callback }); return; } const callbacks = _events.get(name); if (!callbacks) { return; } const found = callbacks.indexOf(callback); if (found >= 0) { callbacks.splice(found, 1); if (callbacks.length === 0) { _events.delete(name); } } } /** * Triggers given event with given callback parameters. * * @param {string} name - Event name. * @param {...*} args - Event parameters. * * @example * events.on('hello', wat => console.log(wat)); * events.trigger('hello', 'world'); */ trigger(name, ...args) { this._trigger(name, false, ...args); } /** * Triggers given event with given callback parameters on next execution frame (delayed). * * @param {string} name - Event name. * @param {...*} args - Event parameters. * * @example * events.on('hello', wat => console.log(wat)); * events.triggerLater('hello', 'world'); */ triggerLater(name, ...args) { this._trigger(name, true, ...args); } _trigger(name, delayed, ...args) { if (typeof name !== 'string') { throw new Error('`name` is not type of String!'); } const { _events, _onQueue, _offQueue } = this; if (this._triggerDepth <= 0) { for (let i = 0, c = _onQueue.length; i < c; ++i) { const { name, callback } = _onQueue[i]; this.on(name, callback); } for (let i = 0, c = _offQueue.length; i < c; ++i) { const { name, callback } = _offQueue[i]; this.off(name, callback); } this._onQueue = []; this._offQueue = []; } const callbacks = _events.get(name); if (!callbacks) { return; } if (!!delayed) { for (let i = 0, c = callbacks.length; i < c; ++i) { setTimeout((callback) => { try { callback(...args); } catch (error) { console.error(error); } }, 0, callbacks[i]); } } else { ++this._triggerDepth; for (let i = 0, c = callbacks.length; i < c; ++i) { try { callbacks[i](...args); } catch (error) { console.error(error); } } --this._triggerDepth; } } } </code></pre> </div> <footer class="footer"> Generated by <a href="https://esdoc.org">ESDoc(1.1.0)<img src="./image/esdoc-logo-mini-black.png"></a> </footer> <script src="script/search_index.js"></script> <script src="script/search.js"></script> <script src="script/pretty-print.js"></script> <script src="script/inherited-summary.js"></script> <script src="script/test-summary.js"></script> <script src="script/inner-link.js"></script> <script src="script/patch-for-local.js"></script> </body> </html>