MenuToolButton.connectShowMenu

gulong connectShowMenu(T)(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] :  gtk.menu_tool_button.MenuToolButton)))
   &&  Parameters!T.length <  2)

Connect to ShowMenu signal.

The ::show-menu signal is emitted before the menu is shown.

It can be used to populate the menu on demand, using [gtk.menu_tool_button.MenuToolButton.setMenu].

Note that even if you populate the menu dynamically in this way, you must set an empty menu on the #GtkMenuToolButton beforehand, since the arrow is made insensitive if the menu is not set.

Parameters

`callback`	signal callback delegate or function to connect `void callback(gtk.menu_tool_button.MenuToolButton menuToolButton)` `menuToolButton` 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