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    REPORT.md clock.js event_emitter.js model.js score_keeper.js tetrimino.js tetrimino_factory.js tetris.js tetris_control.js tetris_view.js util.js

  • event_emitter.js

  • ¶ 
    Tetris.js - A Tetris clone for HTML5
Copyright (C) 2014  Chris Barrick <cbarrick1@gmail.com>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

    
define(function (require, exports, module) {
	'use strict';
  • ¶

    A simple event emitter.

    	var EventEmitter = module.exports = function () {
		this._events = {};
	};


	EventEmitter.prototype = {
  • ¶

    e.on(event, callback)

  • ¶

    Registers a callback to be called whenever the event is triggered

    Params

    • event (String): The name of the event for which to listen.
    • callback (Function): The function to be called when the event is triggered. The context of the function is the EventEmitter instance.
    		on: function (event, callback) {
			var events = this._events;
			if (!events[event]) events[event] = [];
			events[event].push(callback);
		},
  • ¶

    e.off([event, [callback]])

  • ¶

    Remove event listeners. If no event is given, all event listeners are removed. If no callback is given, all listeners for the event are removed. Else the callback given is removed as a listener for the given event.

    Params

    • event (String): The event to for which to remove listeners.
    • callback (Function): The listener to be removed.
    		off: function (event, callback) {
			var events = this._events;
			if (event) {
				if (callback) {
					var index = events[event].indexOf(callback);
					events[event].splice(index, 1);
				} else {
					events[event] = [];
				}
			} else {
				this._events = {};
			}
		},
  • ¶

    e.once(event, callback)

  • ¶

    Registers a callback to be invoked once on the next instance of an event.

    Params

    • event (String): The name of the event to listen for
    • callback (Function): The function to be called when the event is triggered. The context of the function is the EventEmitter instance.
    		once: function (event, callback) {
			var oneTime = function () {
				callback.apply(this, arguments);
				this.off(event, oneTime);
			}.bind(this);
			this.on(event, oneTime);
		},
  • ¶

    e.trigger(event)

  • ¶

    Triggers all listeners for an event.

    Params

    • event (String): The event to emitt.
    		trigger: function (event) {
			var args = Array.prototype.slice.call(arguments, 1);
			var e = this._events[event];
			if (e) {
				e.forEach(function (callback) {
					callback.apply(this, args);
				}.bind(this));
			}
		}

	};

});