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export class EventEmitter { private _events: any = {}; private _count = 0;
private _bind(eventName: string, callback: any, is_one:number, context: any) { if (typeof(eventName) !== 'string' || typeof(callback) !== 'function') { throw new Error('_bind args is not safe!') } if (!Object.prototype.hasOwnProperty.call(this._events,eventName)) { this._events[eventName] = {}; } this._events[eventName][++this._count] = [callback, is_one, context]; return [eventName, this._count]; }
private _each(obj: [], callback: any) { for (let key in obj) { if(obj.hasOwnProperty(key)) { callback(key, obj[key]); } } }
private _emitFunc(eventName: string, args: any) { if (Object.prototype.hasOwnProperty.call(this._events,eventName)){ this._each(this._events[eventName], (key: number, item: any) => { item[0].apply(item[2], args); if (item[1]) delete this._events[eventName][key]; }); } }
on(eventName: string, callback: any, context?: any) { context = context || this; return this._bind(eventName, callback, 0, context); }
once(eventName: string, callback: any, context?: any) { context = context || this; return this._bind(eventName, callback, 1, context); }
off(event: string | [string, number]) { if (typeof(event) === 'string') { if(Object.prototype.hasOwnProperty.call(this._events,event)) { delete this._events[event]; return true; } return false; } else if (typeof(event) === 'object') { let eventName = event[0]; let key = event[1]; if (Object.prototype.hasOwnProperty.call(this._events, eventName) && Object.prototype.hasOwnProperty.call(this._events[eventName], key)) { delete this._events[eventName][key]; return true; } return false; } }
emit(eventName: string, ...array: Array<any>) { setTimeout(() => { this._emitFunc(eventName, array); }); }
clearAll() { this._events = {}; } }
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