Recently someone tried to style a widget using CSS, https://github.com/StefanSalewski/gintro/issues/2#issuecomment-316167963 and so I discovered that there is still some labor for me... Before I start coding, maybe it is better to verify my understanding of the gobject interfaces... For example, we have https://developer.gnome.org/gtk3/stable/GtkStyleContext.html#gtk-style-context-add-provider which may be called from C like gtk_style_context_add_provider(gtk_widget_get_style_context(window), GTK_STYLE_PROVIDER(cssProvider), GTK_STYLE_PROVIDER_PRIORITY_USER); So the second parameter is of type GtkStyleProvider, which is an interface. GtkCssProvider provides that interface, so we can pass a variable of that type. GTK_STYLE_PROVIDER() is basically only a cast, a re-interpretation of the bit pattern, maybe with additional security checks. As we generally do not want such casts in higher level languages, we may just provide an additional function with the same name which accepts a GtkCssProvider. For this special case that is clear, and already tested. So I assume, that for all functions which has interfaces as parameters, I can just pass all objects (gobjects) which provides that interface? I even guess hat interfaces are fully abstract entities, so we will never pass an instance of an interface, but always only objects providing the interface. So we have only to provide functions which can accepts all the objects providing the that interface, but we do not really need functions which would accepts the interface parameter type itself? _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx https://mail.gnome.org/mailman/listinfo/gtk-list
