Class: Volt::EventBinding

Inherits:
BaseBinding show all
Defined in:
lib/volt/page/bindings/event_binding.rb

Instance Attribute Summary collapse

Attributes inherited from BaseBinding

#target, #volt_app

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from BaseBinding

#browser, #dom_section, #getter_fail, #remove_anchors

Constructor Details

#initialize(volt_app, target, context, binding_name, event_name, call_proc) ⇒ EventBinding 



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# File 'lib/volt/page/bindings/event_binding.rb', line 35

def initialize(volt_app, target, context, binding_name, event_name, call_proc)
  super(volt_app, target, context, binding_name)

  # Map blur/focus to focusout/focusin
  @event_name = case event_name
  when 'blur'
    'focusout'
  when 'focus'
    'focusin'
  else
    event_name
  end


  handler = proc do |js_event, *args|
    event = JSEvent.new(js_event)
    event.prevent_default! if event_name == 'submit'

    # When the event is triggered via ```trigger(..)``` in a controller,
    # it will pass its self as the first argument.  We set that to
    # ```controller``` on the event, so it can be easily accessed.
    if args[0].is_a?(Volt::ModelController)
      args = args.dup
      event.controller = args.shift
    end

    args << event

    self.class.call_handler_proc(@context, call_proc, event, args)
  end

  @listener = browser.events.add(@event_name, self, handler)
end

Instance Attribute Details

#binding_name ⇒ Object

Returns the value of attribute binding_name.



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# File 'lib/volt/page/bindings/event_binding.rb', line 33

def binding_name
  @binding_name
end

#context ⇒ Object

Returns the value of attribute context.



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# File 'lib/volt/page/bindings/event_binding.rb', line 33

def context
  @context
end

Class Method Details

.call_handler_proc(context, call_proc, event, args) ⇒ Object 



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# File 'lib/volt/page/bindings/event_binding.rb', line 69

def self.call_handler_proc(context, call_proc, event, args)
  # When the EventBinding is compiled, it converts a passed in string to
  # get a Method:
  #
  # Example:
  #   <a e-awesome="some_method">...</a>
  #
  # The call_proc will be passed in as:  Proc.new { method(:some_method) }
  #
  # So first we call the call_proc, then that returns a method (or proc),
  # which we call passing in the arguments based on the arity.
  #
  # If the e- binding has arguments passed to it, we just use those.
  result = context.instance_exec(event, &call_proc)
  # Trim args to match arity

  # The proc returned a
  if result && result.is_a?(Method)
    args = args[0...result.arity]

    result.call(*args)
  end

  result
end

Instance Method Details

#remove ⇒ Object

Remove the event binding



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# File 'lib/volt/page/bindings/event_binding.rb', line 96

def remove
  browser.events.remove(@event_name, self)
end