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42 lines
1.3 KiB
CoffeeScript
42 lines
1.3 KiB
CoffeeScript
define [], () ->
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# Simple event emitter implementation, but has a slightly unusual API for
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# removing specific listeners. If a specific listener needs to be removed
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# (instead of all listeners), then it needs to use a "namespace":
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# Create a listener on the foo event with bar namespace: .on 'foo.bar'
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# Trigger all events for the foo event (including namespaces): .trigger 'foo'
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# Remove all listeners for the foo event (including namespaces): .off 'foo'
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# Remove a listener for the foo event with the bar namespace: .off 'foo.bar'
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class EventEmitter
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on: (event, callback) ->
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@events ||= {}
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[event, namespace] = event.split(".")
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@events[event] ||= []
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@events[event].push {
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callback: callback
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namespace: namespace
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}
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off: (event) ->
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@events ||= {}
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if event?
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[event, namespace] = event.split(".")
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if !namespace?
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# Clear all listeners for event
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delete @events[event]
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else
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# Clear only namespaced listeners
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remaining_events = []
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for callback in @events[event] or []
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if callback.namespace != namespace
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remaining_events.push callback
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@events[event] = remaining_events
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else
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# Remove all listeners
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@events = {}
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trigger: (event, args...) ->
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@events ||= {}
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for callback in @events[event] or []
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callback.callback(args...)
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emit: (args...) -> @trigger(args...)
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