events

events.js

class foo {
  constructor(){
    this._listeners = {};
  }
  
  addEventLister(event,callback){
    if(!this._listeners[event]){
      this._listeners[event] = [];
    }
    this._listeners[event].push(callback);
    
    this.eventFramework.addEventListener(event,callback);
  }
  
  removeEventListener(event,callback){
    if(!this._listeners[event]){
      return;
    }
    
    if(!callback){
      for(let i = 0;i<this._listeners[event].length;i++){
       this.eventFramework.removeEventListener(event,this._listeners[event][i]); 
      }
      this._listeners[event] = [];
    } else {
      let _callbacks = [];
      for(let i = 0;i<this._listeners[event].length;i++){
        if(this._listeners[event][i] === callback){
          this.eventFramework.removeEventListener(event,callback);
        } else {
          _callbacks.push(this._listeners[event][i]);
        }
      }
      this._listeners[event] = _callbacks;
    }
  }
}