Gtk.Widget::child-notify

function callback(widget, child_property:GObject.ParamSpec, ):void;

The ::child-notify signal is emitted for each <link linkend="child-properties">child property</link> that has changed on an object. The signal's detail holds the property name.

widget: instance of Gtk.Widget that is emitting the signal
child_property: the GObject.ParamSpec of the changed child property