Widget.connectUnmapEvent

gulong connectUnmapEvent(T)(T callback,  Flag!"After" after =  No.After) if (isCallable!T
    &&  is(ReturnType!T ==  bool)
   && (Parameters!T.length <  1 || (ParameterStorageClassTuple!T[0]  ==  ParameterStorageClass.none &&  is(Parameters!T[0]  ==  gdk.event_any.EventAny)))
   && (Parameters!T.length <  2 || (ParameterStorageClassTuple!T[1]  ==  ParameterStorageClass.none &&  is(Parameters!T[1] :  gtk.widget.Widget)))
   &&  Parameters!T.length <  3)

Connect to UnmapEvent signal.

The ::unmap-event signal will be emitted when the widget's window is unmapped. A window is unmapped when it becomes invisible on the screen.

To receive this signal, the #GdkWindow associated to the widget needs to enable the #GDK_STRUCTURE_MASK mask. GDK will enable this mask automatically for all new windows.

Parameters

`callback`	signal callback delegate or function to connect `bool callback(gdk.event_any.EventAny event, gtk.widget.Widget widget)` `event` the #GdkEventAny which triggered this signal (optional) `widget` the instance the signal is connected to (optional) `Returns` true to stop other handlers from being invoked for the event. false to propagate the event further.
`after`	Yes.After to execute callback after default handler, No.After to execute before (default)

Returns

Signal ID