DatePickerBuilder typedef
DatePickerBuilder =
Future<DateTime?> Function(BuildContext context, DateTime currentDate)
Signature for a custom date-picker dialog.
context — the build context.
currentDate — the date currently shown in the text field (or
DatePickerTextField.initialDate on first open).
Return the selected DateTime or null if the user cancelled.
Implementation
typedef DatePickerBuilder = Future<DateTime?> Function(
BuildContext context,
DateTime currentDate,
);