How to import specific Widget to another file

Question

I have created this date picker

Widget completedDatePicker() => Column(
children: [
  buildDatePicker(),
  confirmButton(),
  ]);

and I want to import just this widget to another file like this enter image description here

how do I import it and should I use Stack class to make it like the picture above

Solution

I know it, so I use class to return widget to another file like this

class TestWidget extends StatelessWidget

{
  final Color bgColor;
  final String title;

  const TestWidget(Key key,this.title, this.bgColor) : super(key: key);
return (widget here);
}

Comments

[Somxhai]

and how do I import it just the date picker at the bottom of the screen without extra white screen