Widget.connectChildNotify

gulong connectChildNotify(T)(string detail =  null,  T callback,  Flag!"After" after =  No.After) if (isCallable!T
    &&  is(ReturnType!T ==  void)
   && (Parameters!T.length <  1 || (ParameterStorageClassTuple!T[0]  ==  ParameterStorageClass.none &&  is(Parameters!T[0]  ==  gobject.param_spec.ParamSpec)))
   && (Parameters!T.length <  2 || (ParameterStorageClassTuple!T[1]  ==  ParameterStorageClass.none &&  is(Parameters!T[1] :  gtk.widget.Widget)))
   &&  Parameters!T.length <  3)

Connect to ChildNotify signal.

The ::child-notify signal is emitted for each [child property][child-properties] that has changed on an object. The signal's detail holds the property name.

Parameters

`detail`	Signal detail or null (default)
`callback`	signal callback delegate or function to connect `void callback(gobject.param_spec.ParamSpec childProperty, gtk.widget.Widget widget)` `childProperty` the #GParamSpec of the changed child property (optional) `widget` the instance the signal is connected to (optional)
`after`	Yes.After to execute callback after default handler, No.After to execute before (default)

Returns

Signal ID