From: Andy Tai <atai@atai.org>
To: Maxime Devos <maximedevos@telenet.be>
Cc: guile-user@gnu.org
Subject: Re: guile_gi question: gtk+ interface object?
Date: Tue, 14 Jun 2022 21:05:43 -0700 [thread overview]
Message-ID: <CAJsg1E-1TpFay5EU3043cEdcv1BXs1dt4JPS8y_=1OW+Evd79Q@mail.gmail.com> (raw)
In-Reply-To: <bf9e51509669ac87edef951ef0692223c28f699c.camel@telenet.be>
Hi, thanks for the reply. The interface in GObject level does not
necessarily translate as is to GOOPS at guile level...
the context of this question is
(let ((iter (make <GtkTreeIter>))
(model (make <GtkTreeModel>)))
(define selected (tree-selection:get-selected! selection model iter))
get_selected(GtkTreeModel out model, GtkTreeeIter out iter) has two
out parameters, model and iter, but I think GOOPS does type check on
arguments before invoking a method so both parameters must be
initialized to the expected types.
The model parameter normally is instance of a GOBject class
"implementing" the GtkTreeModel interface (at the GOBject level), and
I cannot pass in a concrete GOBject class that implements GtkTreeModel
as GOOPS will reject such calls--GOOPS does not understand "class
implementing an interface" at the GOBject level. So I don't know how
to initialize the model parameter.
On Tue, Jun 14, 2022 at 12:42 PM Maxime Devos <maximedevos@telenet.be> wrote:
>
> Andy Tai schreef op di 14-06-2022 om 11:52 [-0700]:
> > question: how to create object representing Gtk+ (version 3)
> > interfaces? For example.
> >
> > (let (model (make <GtkTreeModel>)))
> >
> > would fail because GtkTreeModel is an interface, not class derived
> > from GObject.
>
> By definition, you cannot instatiate interfaces, but you can
> instantiate classes derived from GtkTreeModel?
> Maybe guile-gi even supports defining an implementation yourself in
> Scheme with GOOPS ...
>
--
Andy Tai, atai@atai.org, Skype: licheng.tai, Line: andy_tai, WeChat: andytai1010
Year 2021 民國110年
自動的精神力是信仰與覺悟
自動的行為力是勞動與技能
next prev parent reply other threads:[~2022-06-15 4:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-14 18:52 guile_gi question: gtk+ interface object? Andy Tai
2022-06-14 19:42 ` Maxime Devos
2022-06-15 4:05 ` Andy Tai [this message]
2022-06-15 7:48 ` Maxime Devos
-- strict thread matches above, loose matches on Subject: below --
2022-06-14 18:46 Andy Tai
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.gnu.org/software/guile/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAJsg1E-1TpFay5EU3043cEdcv1BXs1dt4JPS8y_=1OW+Evd79Q@mail.gmail.com' \
--to=atai@atai.org \
--cc=guile-user@gnu.org \
--cc=maximedevos@telenet.be \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).