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

[cedlemo <ce...@gm...>]

Thomas,

When you use the GObjectInstrospection::Loader, you don't need to 
subclass GLib::Object. Look at the vte3 loader :
https://github.com/ruby-gnome2/ruby-gnome2/blob/master/vte3/lib/vte3.rb 
which is really simple

then if you do

irb -r vte3
 >Vte::Terminal.ancestors

[Vte::Terminal, Gtk::Scrollable, Gtk::Widget, Gtk::Buildable, 
Atk::Implementor, GLib::Interface, GLib::InitiallyUnowned, GLib::Object, 
GLib::Instantiatable, Object, Kernel, BasicObject]

All the hierarchy of classes, sub-class, dependencies have been done.


I didn't know about the interfaces or if they are supported. I am sure 
that Kou will give you a better answer on this advanced topic.



cedlemo

On 21/07/2016 21:00, Thomas Martitz wrote:
> 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
>
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