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Irene Ros
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Nov 16, 2012
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| (function(global, _) { | ||
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| var Miso = global.Miso = (global.Miso || {}); | ||
|
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| /** | ||
| * Miso Events is a small set of methods that can be mixed into any object | ||
| * to make it evented. It allows one to then subscribe to specific object events, | ||
| * to publish events, unsubscribe and subscribeOnce. | ||
| */ | ||
| Miso.Events = { | ||
|
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| /** | ||
| * Triggers a specific event and passes any additional arguments | ||
| * to the callbacks subscribed to that event. | ||
| * Params: | ||
| * name - the name of the event to trigger | ||
| * .* - any additional arguments to pass to callbacks. | ||
| */ | ||
| publish : function(name) { | ||
| var args = _.toArray(arguments); | ||
| args.shift(); | ||
|
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| if (this._events && this._events[name]) { | ||
| _.each(this._events[name], function(subscription) { | ||
| subscription.callback.apply(subscription.context || this, args); | ||
| }, this); | ||
| } | ||
| return this; | ||
| }, | ||
|
|
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| /** | ||
| * Allows subscribing on an evented object to a specific name. | ||
| * Provide a callback to trigger. | ||
| * Params: | ||
| * name - event to subscribe to | ||
| * callback - callback to trigger | ||
| * options - optional arguments | ||
| * priority - allows rearranging of existing callbacks based on priority | ||
| * context - allows attaching diff context to callback | ||
| * token - allows callback identification by token. | ||
| */ | ||
| subscribe : function(name, callback, options) { | ||
| options = options || {}; | ||
| this._events = this._events || {}; | ||
| this._events[name] = this._events[name] || []; | ||
|
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| var subscription = { | ||
| callback : callback, | ||
| priority : options.priority || 0, | ||
| token : options.token || _.uniqueId('t'), | ||
| context : options.context || this | ||
| }; | ||
| var position; | ||
| _.each(this._events[name], function(event, index) { | ||
| if (!_.isUndefined(position)) { return; } | ||
| if (event.priority <= subscription.priority) { | ||
| position = index; | ||
| } | ||
| }); | ||
|
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| this._events[name].splice(position, 0, subscription); | ||
| return subscription.token; | ||
| }, | ||
|
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| /** | ||
| * Allows subscribing to an event once. When the event is triggered | ||
| * this subscription will be removed. | ||
| * Params: | ||
| * name - name of event | ||
| * callback - The callback to trigger | ||
| * options - optional arguments | ||
| * priority - allows rearranging of existing callbacks based on priority | ||
| * context - allows attaching diff context to callback | ||
| * token - allows callback identification by token. | ||
| */ | ||
| subscribeOnce : function(name, callback, options) { | ||
| this._events = this._events || {}; | ||
| options = options || {}; | ||
| var self = this; | ||
|
|
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| if (typeof options.token === "undefined") { | ||
| options.token = _.uniqueId('t'); | ||
| } | ||
|
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| return this.subscribe(name, function() { | ||
| self.unsubscribe(name, { token : options.token }); | ||
| callback.apply(this, arguments); | ||
| }, options); | ||
| }, | ||
|
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| /** | ||
| * Allows unsubscribing from a specific event | ||
| * Params: | ||
| * name - event to unsubscribe from | ||
| * identifier - callback to remove OR token. | ||
| */ | ||
| unsubscribe : function(name, identifier) { | ||
|
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| if (_.isUndefined(this._events[name])) { return this; } | ||
|
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| if (_.isFunction(identifier)) { | ||
| this._events[name] = _.reject(this._events[name], function(b) { | ||
| return b.callback === identifier; | ||
| }); | ||
|
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| } else if ( _.isString(identifier)) { | ||
| this._events[name] = _.reject(this._events[name], function(b) { | ||
| return b.token === identifier; | ||
| }); | ||
|
|
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| } else { | ||
| this._events[name] = []; | ||
| } | ||
| return this; | ||
| } | ||
|
|
||
| }; | ||
|
|
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| }(this, _)); |
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