Class: Volt::DocumentEvents

Inherits:
Object show all
Defined in:
lib/volt/page/document_events.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ DocumentEvents

Returns a new instance of DocumentEvents.



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# File 'lib/volt/page/document_events.rb', line 3

def initialize
  @events = {}
end

Instance Method Details

#add(event, binding, handler) ⇒ Object 



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# File 'lib/volt/page/document_events.rb', line 7

def add(event, binding, handler)
  # Track each document event based on the event, element id, then binding.object_id
  unless @events[event]
    # We haven't defined an event of type event yet, lets attach it to the
    # document.

    @events[event] = {}

    that = self

    `
    $('body').on(event, function(e) {
      that.$handle(event, e, e.target || e.originalEvent.target);
    });
  `

  end

  @events[event][binding.binding_name]                    ||= {}
  @events[event][binding.binding_name][binding.object_id] = handler
end

#handle(event_name, event, target) ⇒ Object 



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# File 'lib/volt/page/document_events.rb', line 29

def handle(event_name, event, target)
  element = `$(#{target})`

  loop do
    # Lookup the handler, make sure to not assume the group
    # exists.
    # TODO: Sometimes the event doesn't exist, but we still get
    # an event.
    handlers = @events[event_name]

    element_id = `(element && element[0] && element[0].id) || ''`

    handlers = handlers[element_id] if handlers

    if handlers
      handlers.values.each do |handler|
        # Call each handler for this object
        handler.call(event)
      end
    end

    if `element.length` == 0
      break
    else
      `element = element.parent()`
    end
  end

  nil
end

#remove(event, binding) ⇒ Object 



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# File 'lib/volt/page/document_events.rb', line 60

def remove(event, binding)
  # Remove the event binding
  @events[event][binding.binding_name].delete(binding.object_id)

  # if there are no more handlers for this binding_name (the html id), then
  # we remove the binding name hash
  if @events[event][binding.binding_name].size == 0
    @events[event].delete(binding.binding_name)
  end

  # if there are no more handlers in this event, we can unregister the event
  # from the document
  if @events[event].size == 0
    @events.delete(event)

    # Remove the event from the body
    `
      $('body').unbind(event);
    `
  end
end