Scale.connectFormatValue

gulong connectFormatValue(T)(T callback,  Flag!"After" after =  No.After) if (isCallable!T
    &&  is(ReturnType!T ==  string)
   && (Parameters!T.length <  1 || (ParameterStorageClassTuple!T[0]  ==  ParameterStorageClass.none &&  is(Parameters!T[0]  ==  double)))
   && (Parameters!T.length <  2 || (ParameterStorageClassTuple!T[1]  ==  ParameterStorageClass.none &&  is(Parameters!T[1] :  gtk.scale.Scale)))
   &&  Parameters!T.length <  3)

Connect to FormatValue signal.

Signal which allows you to change how the scale value is displayed. Connect a signal handler which returns an allocated string representing value. That string will then be used to display the scale's value.

If no user-provided handlers are installed, the value will be displayed on its own, rounded according to the value of the #GtkScale:digits property.

Here's an example signal handler which displays a value 1.0 as with "-->1.0<--".

static gchar*
 format_value_callback (GtkScale *scale,
                        gdouble   value)
 {
   return g_strdup_printf ("-->\%0.*g<--",
                           gtk_scale_get_digits (scale), value);
  }

Parameters

`callback`	signal callback delegate or function to connect `string callback(double value, gtk.scale.Scale scale)` `value` the value to format (optional) `scale` the instance the signal is connected to (optional) `Returns` allocated string representing value
`after`	Yes.After to execute callback after default handler, No.After to execute before (default)

Returns

Signal ID