Re: [ruby-gnome2-devel-en] How-To Interfaces

[Thomas M. <ku...@ro...>]

Am 21.07.2016 um 20:49 schrieb cedlemo:
> Hi Thomas, I don't really understand what you are calling an interface.
> Are you building a Peas ruby module
> based on the GObjectInstrospection::Loader?
>
> I don't understand why you try to create a subclass of GLib::Object
> directly.
>
> If you could explain me this, I should be more helpful.


PeasActivatable is a GObject interface, see [1] and [2]. I want to 
create a ruby class that implements this interface. Finally I want 
libpeas (a C library) to interact with instances of that class (have 
libpeas call activate, deactivate and update_state methods()).

In ruby, a module seems to correspond largely to an interface in GObject.

libpeas provides a typelib, therefore I use 
GObjectInstrospection::Loader to load the typelib and import libpeas 
bindings into Ruby space. This part seems to work fine, as I'm able to 
introspect most (if not all) of libpeas bindings.

In GObject, interfaces can have "prerequisite type", which means that 
implementations of the interface must also be a subclass of that class 
type. PeasActivatable specifies G_TYPE_OBJECT as the prerequisite. 
Therefore I want to subclass GLib::Object.

[1] 
https://developer.gnome.org/gobject/stable/gtype-non-instantiable-classed.html
[2] https://developer.gnome.org/libpeas/stable/PeasActivatable.html

Best regards