primo-events/eventable.js

Eventing infrastructure for PrimoJS

var _ = require('underscore')
var EventContainer = require('./eventcontainer');
  
var Eventable = function() {
  this.eventListeners = {};
  this.eventDepth = 0;
  this.proxies = []
};

Eventable.prototype = {
  autoHook: function(container) {
    for(var key in container) { 
      if(key.indexOf('on') === 0) {
        this.on(key.substr(2), container[key], container);
      }   
    }
  },
  autoUnhook: function(container) {
    for(var key in container) { 
      if(key.indexOf('on') === 0) {
        this.off(key.substr(2), container[key], container);
      }   
    }
  },
  clearListeners: function() {
    this.eventListeners = {};
    this.eventDepth = 0;
    this.proxies = []
  },
  once: function(eventName, callback, context) {
    var self = this;
    var wrappedCallback = function(data, sender) {
      callback.call(this, data, sender);
      self.off(eventName, wrappedCallback, context);
    };
    this.on(eventName, wrappedCallback, context);
  },
  
  on: function(eventName, callback, context) {
    this.eventContainerFor(eventName).add(callback, context);
  },
  
  off: function(eventName, callback, context) {
    this.eventContainerFor(eventName).remove(callback, context);
  },
  raise: function(eventName, data, sender) {
    var container = this.eventListeners[eventName];

    if(container)
      container.raise(sender || this, data);

    var proxies = this.proxies
    for(var i = 0 ; i < proxies.length ; i++)
      proxies[i].raise(eventName, data, sender || this)
  },
  addProxy: function(proxy) {
    this.proxies.push(proxy)
  },
  removeProxy: function(proxy) {
    this.proxies = _.without(this.proxies, proxy)
  },
  eventContainerFor: function(eventName) {
    var container = this.eventListeners[eventName];
    if(!container) {
      container =  new EventContainer(this);
      this.eventListeners[eventName] = container;
    }
    return container;
  }
};

module.exports = Eventable;