derby/lib/Controller.js

var EventEmitter = require('events').EventEmitter;
var util = require('racer/lib/util');
var Dom = require('./Dom');

module.exports = Controller;

function Controller(app, page, model) {
  EventEmitter.call(this);
  this.dom = new Dom(this);
  this.app = app;
  this.page = page;
  this.model = model;
  model.data.$controller = this;
}

util.mergeInto(Controller.prototype, EventEmitter.prototype);

Controller.prototype.emitCancellable = function() {
  var cancelled = false;
  function cancel() {
    cancelled = true;
  }

  var args = Array.prototype.slice.call(arguments);
  args.push(cancel);
  this.emit.apply(this, args);

  return cancelled;
};

Controller.prototype.emitDelayable = function() {
  var args = Array.prototype.slice.call(arguments);
  var callback = args.pop();

  var delayed = false;
  function delay() {
    delayed = true;
    return callback;
  }

  args.push(delay);
  this.emit.apply(this, args);
  if (!delayed) callback();

  return delayed;
};