Re: Subclassing a GObject in Typescript

[philip chimento gmail com]

On Tue, Nov 13, 2018 at 3:02 PM Tony Houghton <h realh co uk> wrote:

On Tue, 13 Nov 2018 at 18:23, <philip chimento gmail com> wrote:

On Tue, Nov 13, 2018 at 11:35 AM Tony Houghton <h realh co uk> wrote:

Yes, it does the job, but it seems a shame that I can't take advantage of all the facilities that should be available by using GObject with an OO language. I suppose a good way to proceed for now would be to compromise by deriving Typescript classes from GObject classes but assume that I can't override native virtual functions this way and use signals instead.

You can override the virtual functions, but they all start with vfunc_. You can find them in the documentation, for example Gtk.Widget's virtual functions start here: http://devdocs.baznga.org/gtk30~3.22.12/gtk.widget#vfunc-adjust_baseline_allocation

Yes, I saw the use of the vfunc_ prefix, but I figured that was something that registerClass sets up and overrides won't work properly without it. Or will vfuncs work and I only need to use registerClass to be able to add signals and properties etc?

You always need to use registerClass to inherit from a GObject class, or it simply won't work.

(Python gets around this requirement by having metaclasses, which register the GObject class when you create the class object. JS doesn't have these.)