64 lines
1.6 KiB
JavaScript
64 lines
1.6 KiB
JavaScript
export default class NamedEventHandler {
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constructor () {
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this._eventListener = new Map()
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this._stateListener = new Map()
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}
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_getListener (name) {
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let listeners = this._eventListener.get(name)
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if (listeners === undefined) {
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listeners = {
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once: new Set(),
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on: new Set()
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}
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this._eventListener.set(name, listeners)
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}
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return listeners
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}
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once (name, f) {
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let listeners = this._getListener(name)
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listeners.once.add(f)
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}
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on (name, f) {
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let listeners = this._getListener(name)
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listeners.on.add(f)
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}
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_initStateListener (name) {
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let state = this._stateListener.get(name)
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if (state === undefined) {
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state = {}
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state.promise = new Promise(function (resolve) {
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state.resolve = resolve
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})
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this._stateListener.set(name, state)
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}
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return state
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}
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when (name) {
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return this._initStateListener(name).promise
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}
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off (name, f) {
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if (name == null || f == null) {
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throw new Error('You must specify event name and function!')
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}
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const listener = this._eventListener.get(name)
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if (listener !== undefined) {
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listener.on.delete(f)
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listener.once.delete(f)
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}
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}
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emit (name, ...args) {
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this._initStateListener(name).resolve()
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const listener = this._eventListener.get(name)
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if (listener !== undefined) {
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listener.on.forEach(f => f.apply(null, args))
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listener.once.forEach(f => f.apply(null, args))
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listener.once = new Set()
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} else if (name === 'error') {
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console.error(args[0])
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}
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}
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destroy () {
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this._eventListener = null
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}
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}
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