using Gtk;

public class Activity : Box {

    private SpinButton spin_box;

    public Activity (){
        GLib.Object (orientation: Orientation.VERTICAL, spacing: 5);
    }

    construct {
        spin_box = new SpinButton.with_range (0, 130, 1);
        spin_box.adjustment.value = 35;

        homogeneous = true;
        add (spin_box);
    }
}

void main(string[] args) {
    Gtk.init (ref args);
    var win = new Window ();
    var act = new Activity ();
    win.add (act);
    win.show_all ();
    Gtk.main ();
}