[Request] non-void signals about gi-crystal HOT 2 OPEN

You mean: Support signal return values?

Yes!

I never used (or remember to had used) signals with return values

FWIW, there's quite a few in GTK, here's some: Gtk::ComboBox::PopdownSignal, Gdk::Surface::EventSignal, Gtk::SpinButton::InputSignal

from gi-crystal.

You mean: Support signal return values?

Meanwhile it doesn't support, but yes, it's possible to have this.

First step is to let the signal macro register a signal with a return value, so we can inform to GObject the right GType used for the return type at:

https://github.com/hugopl/gi-crystal/blob/main/src/bindings/g_object/object.cr#L596

Then we also need to register a GObject::SignalAcumulator callback.

I never used (or remember to had used) signals with return values, so I would need to do some experiments in libtest to first see it working in C, to later change the macro to let it work in Crystal.

from gi-crystal.