Class: Three::EventDispatcher

Inherits:
Object
  • Object
show all
Defined in:
lib/three/core/event_dispatcher.rb

Defined Under Namespace

Classes: Event

Instance Method Summary collapse

Constructor Details

#initialize ⇒ EventDispatcher

Returns a new instance of EventDispatcher.



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# File 'lib/three/core/event_dispatcher.rb', line 7

def initialize
  @listeners = Hash.new { |hash, key| hash[key] = [] }
end

Instance Method Details

#add_event_listener(type, listener = nil, &block) ⇒ Object Also known as: on

Raises:

  • (ArgumentError) 


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# File 'lib/three/core/event_dispatcher.rb', line 11

def add_event_listener(type, listener = nil, &block)
  callback = listener || block
  raise ArgumentError, "listener or block is required" unless callback

  listeners = @listeners[type.to_sym]
  listeners << callback unless listeners.include?(callback)
  self
end

#dispatch_event(event, data = nil) ⇒ Object 



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# File 'lib/three/core/event_dispatcher.rb', line 33

def dispatch_event(event, data = nil)
  event = normalize_event(event, data)
  listeners = @listeners[event.type.to_sym]
  return self if listeners.empty?

  event.target = self
  listeners.dup.each { |listener| listener.call(event) }
  event.target = nil
  self
end

#has_event_listener?(type, listener) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/three/core/event_dispatcher.rb', line 22

def has_event_listener?(type, listener)
  @listeners[type.to_sym].include?(listener)
end

#remove_event_listener(type, listener) ⇒ Object Also known as: off 



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# File 'lib/three/core/event_dispatcher.rb', line 26

def remove_event_listener(type, listener)
  @listeners[type.to_sym].delete(listener)
  self
end