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 <maximede...@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, a...@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
