Module: Dommy::CallableInvoker

Defined in:
lib/dommy/callable_invoker.rb

Overview

Invokes a callback that may be a JS-bridged object (responds to __js_call__) or a plain Ruby callable (responds to call). Centralizes the dispatch used by promises, the scheduler, and streams so the JS/Ruby fork lives in one place.

Class Method Summary collapse

Class Method Details

.invoke(callback, *args) ⇒ Object

Invoke callback with args. A JS-bridged callable goes through __js_call__("call", args); a Ruby callable through call(*args). A nil or non-callable callback is a no-op (returns nil).



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# File 'lib/dommy/callable_invoker.rb', line 13

def invoke(callback, *args)
  return if callback.nil?

  if callback.respond_to?(:__js_call__)
    callback.__js_call__("call", args)
  elsif callback.respond_to?(:call)
    callback.call(*args)
  end
end

.invoke_listener(listener, event, current_target = nil) ⇒ Object

Invoke a DOM event listener per the EventTarget rule: an object with handle_event, else a Ruby callable, else a JS-bridged callable (tried in that order). A JS function listener's this must be the event's currentTarget (the node the listener is attached to), so pass it through when the bridge supports an explicit receiver.



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# File 'lib/dommy/callable_invoker.rb', line 28

def invoke_listener(listener, event, current_target = nil)
  if listener.respond_to?(:handle_event)
    listener.handle_event(event)
  elsif listener.respond_to?(:call) && !listener.is_a?(Module)
    listener.call(event)
  elsif listener.respond_to?(:__js_call_with_this__)
    listener.__js_call_with_this__([event], current_target)
  elsif listener.respond_to?(:__js_call__)
    listener.__js_call__("call", [event])
  end
end