Module: GirFFI::InfoExt::ISignalInfo

Defined in:
lib/gir_ffi/info_ext/i_signal_info.rb

Overview

Extensions for GObjectIntrospection::ISignalInfo needed by GirFFI

Instance Method Summary collapse

Instance Method Details

#arguments_to_gvalue_array_pointer(object, args) ⇒ Object

TODO: Use argument info to convert out arguments and array lengths.



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# File 'lib/gir_ffi/info_ext/i_signal_info.rb', line 24

def arguments_to_gvalue_array_pointer object, args
  arr = arguments_to_gvalues object, args
  GirFFI::InPointer.from_array GObject::Value, arr
end

#arguments_to_gvalues(instance, arguments) ⇒ Object 



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# File 'lib/gir_ffi/info_ext/i_signal_info.rb', line 29

def arguments_to_gvalues instance, arguments
  arg_values = self.args.zip(arguments).map do |info, arg|
    info.argument_type.make_g_value.set_value(arg)
  end

  arg_values.unshift GObject::Value.wrap_instance(instance)
end

#create_callback(&block) ⇒ FFI::Function

Create a signal hander callback. Wraps the given block in such a way that arguments and return value are cast correctly to the ruby world and back.

Parameters:

  • block —

    The body of the signal handler

Returns:

  • (FFI::Function) —

    The signal handler, ready to be passed as a callback to C.

Raises:

  • (ArgumentError) 


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# File 'lib/gir_ffi/info_ext/i_signal_info.rb', line 12

def create_callback &block
  raise ArgumentError, "Block needed" unless block

  # TODO: Find the signal module directly, then retrieve the info
  # from that, instead of vice versa.
  bldr = Builders::SignalBuilder.new(self)
  wrapped = bldr.build_class.from(block)
  # FIXME: Logically, this should use CallbackBase#to_native
  FFI::Function.new return_ffi_type, ffi_callback_argument_types, &wrapped
end

#ffi_callback_argument_types ⇒ Object

TODO: Rename and clarify relation to argument_ffi_types: The types returned by ffi_callback_argument_types are more basic than those returned by argument_ffi_types. Is there a way to make these methods more related? Perhaps argument_ffi_types can return more basic types as well?



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# File 'lib/gir_ffi/info_ext/i_signal_info.rb', line 46

def ffi_callback_argument_types
  types = args.map do |arg|
    arg.to_callback_ffitype
  end
  types.unshift(:pointer).push(:pointer)
end

#gvalue_for_return_value ⇒ Object 



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# File 'lib/gir_ffi/info_ext/i_signal_info.rb', line 37

def gvalue_for_return_value
  return_type.make_g_value
end

#return_ffi_type ⇒ Object 



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# File 'lib/gir_ffi/info_ext/i_signal_info.rb', line 53

def return_ffi_type
  result = return_type.to_ffitype
  if result == GLib::Boolean
    :bool
  else
    result
  end
end