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29 lines
1023 B
CoffeeScript
29 lines
1023 B
CoffeeScript
_ = require 'underscore'
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module.exports =
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subscribe: (eventEmitter, eventName, callback) ->
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eventEmitter.on eventName, callback
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@subscriptions ?= []
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@subscriptionsByObject ?= new WeakMap
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@subscriptionsByObject.set(eventEmitter, []) unless @subscriptionsByObject.has(eventEmitter)
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subscription = cancel: -> eventEmitter.off eventName, callback
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@subscriptions.push(subscription)
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@subscriptionsByObject.get(eventEmitter).push(subscription)
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subscribeToCommand: (view, eventName, callback) ->
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view.command eventName, callback
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@subscriptions ?= []
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@subscriptions.push(cancel: -> view.off eventName, callback)
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unsubscribe: (object) ->
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if object?
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for subscription in @subscriptionsByObject?.get(object) ? []
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subscription.cancel()
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_.remove(@subscriptions, subscription)
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@subscriptionsByObject?.delete(object)
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else
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subscription.cancel() for subscription in @subscriptions ? []
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@subscriptions = null
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@subscriptionsByObject = null
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