tiptap/packages/core/src/EventEmitter.ts

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2020-04-02 03:15:23 +08:00
export default class EventEmitter {
_callbacks: { [key: string]: Function[] } = {}
on(event: string, fn: Function) {
if (!this._callbacks[event]) {
this._callbacks[event] = []
}
this._callbacks[event].push(fn)
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2020-04-02 03:15:23 +08:00
return this
}
emit(event: string, ...args: any) {
const callbacks = this._callbacks[event]
if (callbacks) {
callbacks.forEach(callback => callback.apply(this, args))
}
return this
}
off(event: string, fn?: Function) {
const callbacks = this._callbacks[event]
if (callbacks) {
if (fn) {
this._callbacks[event] = callbacks.filter(callback => callback !== fn)
} else {
delete this._callbacks[event]
}
}
return this
}
removeAllListeners() {
this._callbacks = {}
}
}