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/*! elementor - v0.7.1 - 18-08-2016 */ |
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// Backbone.Radio v1.0.4 |
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|
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(function (global, factory) { |
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typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('underscore'), require('backbone')) : |
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typeof define === 'function' && define.amd ? define(['underscore', 'backbone'], factory) : |
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(global.Backbone = global.Backbone || {}, global.Backbone.Radio = factory(global._,global.Backbone)); |
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}(this, function (_,Backbone) { 'use strict'; |
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|
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_ = 'default' in _ ? _['default'] : _; |
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Backbone = 'default' in Backbone ? Backbone['default'] : Backbone; |
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|
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var babelHelpers = {}; |
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babelHelpers.typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { |
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return typeof obj; |
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} : function (obj) { |
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return obj && typeof Symbol === "function" && obj.constructor === Symbol ? "symbol" : typeof obj; |
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}; |
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babelHelpers; |
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|
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var previousRadio = Backbone.Radio; |
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|
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var Radio = Backbone.Radio = {}; |
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|
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Radio.VERSION = '1.0.4'; |
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|
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// This allows you to run multiple instances of Radio on the same |
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// webapp. After loading the new version, call `noConflict()` to |
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// get a reference to it. At the same time the old version will be |
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// returned to Backbone.Radio. |
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Radio.noConflict = function () { |
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Backbone.Radio = previousRadio; |
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return this; |
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}; |
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|
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// Whether or not we're in DEBUG mode or not. DEBUG mode helps you |
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// get around the issues of lack of warnings when events are mis-typed. |
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Radio.DEBUG = false; |
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|
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// Format debug text. |
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Radio._debugText = function (warning, eventName, channelName) { |
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return warning + (channelName ? ' on the ' + channelName + ' channel' : '') + ': "' + eventName + '"'; |
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}; |
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|
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// This is the method that's called when an unregistered event was called. |
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// By default, it logs warning to the console. By overriding this you could |
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// make it throw an Error, for instance. This would make firing a nonexistent event |
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// have the same consequence as firing a nonexistent method on an Object. |
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Radio.debugLog = function (warning, eventName, channelName) { |
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if (Radio.DEBUG && console && console.warn) { |
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console.warn(Radio._debugText(warning, eventName, channelName)); |
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} |
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}; |
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|
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var eventSplitter = /\s+/; |
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|
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// An internal method used to handle Radio's method overloading for Requests. |
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// It's borrowed from Backbone.Events. It differs from Backbone's overload |
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// API (which is used in Backbone.Events) in that it doesn't support space-separated |
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// event names. |
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Radio._eventsApi = function (obj, action, name, rest) { |
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if (!name) { |
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return false; |
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} |
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|
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var results = {}; |
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|
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// Handle event maps. |
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if ((typeof name === 'undefined' ? 'undefined' : babelHelpers.typeof(name)) === 'object') { |
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for (var key in name) { |
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var result = obj[action].apply(obj, [key, name[key]].concat(rest)); |
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eventSplitter.test(key) ? _.extend(results, result) : results[key] = result; |
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} |
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return results; |
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} |
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|
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// Handle space separated event names. |
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if (eventSplitter.test(name)) { |
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var names = name.split(eventSplitter); |
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for (var i = 0, l = names.length; i < l; i++) { |
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results[names[i]] = obj[action].apply(obj, [names[i]].concat(rest)); |
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} |
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return results; |
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} |
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|
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return false; |
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}; |
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|
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// An optimized way to execute callbacks. |
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Radio._callHandler = function (callback, context, args) { |
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var a1 = args[0], |
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a2 = args[1], |
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a3 = args[2]; |
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switch (args.length) { |
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case 0: |
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return callback.call(context); |
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case 1: |
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return callback.call(context, a1); |
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case 2: |
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return callback.call(context, a1, a2); |
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case 3: |
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return callback.call(context, a1, a2, a3); |
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default: |
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return callback.apply(context, args); |
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} |
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}; |
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|
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// A helper used by `off` methods to the handler from the store |
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function removeHandler(store, name, callback, context) { |
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var event = store[name]; |
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if ((!callback || callback === event.callback || callback === event.callback._callback) && (!context || context === event.context)) { |
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delete store[name]; |
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return true; |
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} |
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} |
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|
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function removeHandlers(store, name, callback, context) { |
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store || (store = {}); |
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var names = name ? [name] : _.keys(store); |
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var matched = false; |
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|
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for (var i = 0, length = names.length; i < length; i++) { |
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name = names[i]; |
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|
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// If there's no event by this name, log it and continue |
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// with the loop |
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if (!store[name]) { |
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continue; |
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} |
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|
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if (removeHandler(store, name, callback, context)) { |
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matched = true; |
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} |
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} |
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return matched; |
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} |
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|
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/* |
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* tune-in |
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* ------- |
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* Get console logs of a channel's activity |
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* |
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*/ |
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|
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var _logs = {}; |
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|
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// This is to produce an identical function in both tuneIn and tuneOut, |
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// so that Backbone.Events unregisters it. |
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function _partial(channelName) { |
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return _logs[channelName] || (_logs[channelName] = _.partial(Radio.log, channelName)); |
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} |
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|
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_.extend(Radio, { |
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|
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// Log information about the channel and event |
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log: function log(channelName, eventName) { |
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if (typeof console === 'undefined') { |
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return; |
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} |
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var args = _.drop(arguments, 2); |
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console.log('[' + channelName + '] "' + eventName + '"', args); |
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}, |
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|
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// Logs all events on this channel to the console. It sets an |
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// internal value on the channel telling it we're listening, |
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// then sets a listener on the Backbone.Events |
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tuneIn: function tuneIn(channelName) { |
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var channel = Radio.channel(channelName); |
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channel._tunedIn = true; |
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channel.on('all', _partial(channelName)); |
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return this; |
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}, |
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|
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// Stop logging all of the activities on this channel to the console |
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tuneOut: function tuneOut(channelName) { |
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var channel = Radio.channel(channelName); |
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channel._tunedIn = false; |
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channel.off('all', _partial(channelName)); |
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delete _logs[channelName]; |
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return this; |
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} |
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}); |
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|
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/* |
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* Backbone.Radio.Requests |
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* ----------------------- |
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* A messaging system for requesting data. |
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* |
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*/ |
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|
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function makeCallback(callback) { |
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return _.isFunction(callback) ? callback : function () { |
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return callback; |
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}; |
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} |
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|
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Radio.Requests = { |
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|
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// Make a request |
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request: function request(name) { |
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var args = _.rest(arguments); |
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var results = Radio._eventsApi(this, 'request', name, args); |
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if (results) { |
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return results; |
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} |
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var channelName = this.channelName; |
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var requests = this._requests; |
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|
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// Check if we should log the request, and if so, do it |
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if (channelName && this._tunedIn) { |
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Radio.log.apply(this, [channelName, name].concat(args)); |
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} |
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|
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// If the request isn't handled, log it in DEBUG mode and exit |
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if (requests && (requests[name] || requests['default'])) { |
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var handler = requests[name] || requests['default']; |
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args = requests[name] ? args : arguments; |
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return Radio._callHandler(handler.callback, handler.context, args); |
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} else { |
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Radio.debugLog('An unhandled request was fired', name, channelName); |
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} |
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}, |
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|
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// Set up a handler for a request |
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reply: function reply(name, callback, context) { |
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if (Radio._eventsApi(this, 'reply', name, [callback, context])) { |
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return this; |
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} |
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|
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this._requests || (this._requests = {}); |
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|
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if (this._requests[name]) { |
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Radio.debugLog('A request was overwritten', name, this.channelName); |
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} |
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|
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this._requests[name] = { |
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callback: makeCallback(callback), |
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context: context || this |
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}; |
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|
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return this; |
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}, |
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|
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// Set up a handler that can only be requested once |
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replyOnce: function replyOnce(name, callback, context) { |
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if (Radio._eventsApi(this, 'replyOnce', name, [callback, context])) { |
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return this; |
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} |
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|
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var self = this; |
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|
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var once = _.once(function () { |
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self.stopReplying(name); |
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return makeCallback(callback).apply(this, arguments); |
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}); |
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|
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return this.reply(name, once, context); |
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}, |
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|
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// Remove handler(s) |
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stopReplying: function stopReplying(name, callback, context) { |
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if (Radio._eventsApi(this, 'stopReplying', name)) { |
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return this; |
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} |
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|
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// Remove everything if there are no arguments passed |
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if (!name && !callback && !context) { |
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delete this._requests; |
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} else if (!removeHandlers(this._requests, name, callback, context)) { |
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Radio.debugLog('Attempted to remove the unregistered request', name, this.channelName); |
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} |
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|
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return this; |
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} |
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}; |
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|
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/* |
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* Backbone.Radio.channel |
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* ---------------------- |
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* Get a reference to a channel by name. |
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* |
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*/ |
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|
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Radio._channels = {}; |
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|
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Radio.channel = function (channelName) { |
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if (!channelName) { |
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throw new Error('You must provide a name for the channel.'); |
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} |
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|
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if (Radio._channels[channelName]) { |
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return Radio._channels[channelName]; |
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} else { |
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return Radio._channels[channelName] = new Radio.Channel(channelName); |
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} |
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}; |
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|
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/* |
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* Backbone.Radio.Channel |
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* ---------------------- |
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* A Channel is an object that extends from Backbone.Events, |
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* and Radio.Requests. |
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* |
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*/ |
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|
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Radio.Channel = function (channelName) { |
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this.channelName = channelName; |
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}; |
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|
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_.extend(Radio.Channel.prototype, Backbone.Events, Radio.Requests, { |
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|
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// Remove all handlers from the messaging systems of this channel |
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reset: function reset() { |
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this.off(); |
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this.stopListening(); |
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this.stopReplying(); |
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return this; |
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} |
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}); |
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|
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/* |
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* Top-level API |
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* ------------- |
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* Supplies the 'top-level API' for working with Channels directly |
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* from Backbone.Radio. |
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* |
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*/ |
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|
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var channel; |
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var args; |
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var systems = [Backbone.Events, Radio.Requests]; |
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_.each(systems, function (system) { |
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_.each(system, function (method, methodName) { |
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Radio[methodName] = function (channelName) { |
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args = _.rest(arguments); |
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channel = this.channel(channelName); |
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return channel[methodName].apply(channel, args); |
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}; |
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}); |
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}); |
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|
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Radio.reset = function (channelName) { |
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var channels = !channelName ? this._channels : [this._channels[channelName]]; |
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_.invoke(channels, 'reset'); |
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}; |
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|
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return Radio; |
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|
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})); |
