Class: BubbleWrap::KVO::Registry

Inherits:
Object
  • Object
show all
Defined in:
motion/core/kvo.rb

Constant Summary collapse

COLLECTION_OPERATIONS = 
[ NSKeyValueChangeInsertion, NSKeyValueChangeRemoval, NSKeyValueChangeReplacement ]
OPTION_MAP = 
{
  new: NSKeyValueChangeNewKey,
  old: NSKeyValueChangeOldKey
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(value_keys = [:old, :new]) ⇒ Registry

Returns a new instance of Registry.



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# File 'motion/core/kvo.rb', line 30

def initialize(value_keys = [:old, :new])
  @keys = value_keys.inject([]) do |acc, key|
    value_change_key = OPTION_MAP[key]

    if value_change_key.nil?
      raise RuntimeError, "Unknown value change key #{key}. Possible keys: #{OPTION_MAP.keys}"
    end

    acc << value_change_key
  end

  @callbacks = Hash.new do |hash, key|
    hash[key] = Hash.new do |subhash, subkey|
      subhash[subkey] = Array.new
    end
  end
end

Instance Attribute Details

#callbacks ⇒ Object (readonly)

Returns the value of attribute callbacks.



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# File 'motion/core/kvo.rb', line 28

def callbacks
  @callbacks
end

#keys ⇒ Object (readonly)

Returns the value of attribute keys.



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# File 'motion/core/kvo.rb', line 28

def keys
  @keys
end

Instance Method Details

#add(target, key_path, &block) ⇒ Object 



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# File 'motion/core/kvo.rb', line 48

def add(target, key_path, &block)
  return if target.nil? || key_path.nil? || block.nil?

  block.weak! if BubbleWrap.use_weak_callbacks?

  callbacks[target][key_path.to_s] << block
end

#each_key_path ⇒ Object 



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# File 'motion/core/kvo.rb', line 77

def each_key_path
  callbacks.each do |target, key_paths|
    key_paths.each_key do |key_path|
      yield target, key_path
    end
  end
end

#registered?(target, key_path) ⇒ Boolean

Returns:



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# File 'motion/core/kvo.rb', line 69

def registered?(target, key_path)
  callbacks[target].has_key? key_path.to_s
end

#remove(target, key_path) ⇒ Object 



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# File 'motion/core/kvo.rb', line 56

def remove(target, key_path)
  return if target.nil? || key_path.nil?

  key_path = key_path.to_s

  callbacks[target].delete(key_path)

  # If there no key_paths left for target, remove the target key
  if callbacks[target].empty?
    callbacks.delete(target)
  end
end

#remove_all ⇒ Object 



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# File 'motion/core/kvo.rb', line 73

def remove_all
  callbacks.clear
end