SpinButton.connectInput

gulong connectInput(T)(T callback,  Flag!"After" after =  No.After) if (isCallable!T
    &&  is(ReturnType!T ==  int)
   && (Parameters!T.length <  1 || (ParameterStorageClassTuple!T[0]  ==  ParameterStorageClass.out_ &&  is(Parameters!T[0]  ==  double)))
   && (Parameters!T.length <  2 || (ParameterStorageClassTuple!T[1]  ==  ParameterStorageClass.none &&  is(Parameters!T[1] :  gtk.spin_button.SpinButton)))
   &&  Parameters!T.length <  3)

Connect to Input signal.

The ::input signal can be used to influence the conversion of the users input into a double value. The signal handler is expected to use [gtk.entry.Entry.getText] to retrieve the text of the entry and set new_value to the new value.

The default conversion uses [glib.global.strtod].

Parameters

`callback`	signal callback delegate or function to connect `int callback(out double newValue, gtk.spin_button.SpinButton spinButton)` `newValue` return location for the new value (optional) `spinButton` the instance the signal is connected to (optional) `Returns` true for a successful conversion, false if the input was not handled, and [gtk.types.INPUT_ERROR] if the conversion failed.
`after`	Yes.After to execute callback after default handler, No.After to execute before (default)

Returns

Signal ID