Flutter Drawer Widget - change Scaffold.body content

Question

When using the Flutter Scaffold.Drawer - is it possible to have the links in the Drawer change the content (Scaffold.body) on the page?

Similarly to having links in

Answer 1

You can use this for body of Scaffold:

        body: _getDrawerItemWidget(_selectedDrawerIndex));

and then in the main or state class do like so:

class HomePageState extends State {
  int _selectedDrawerIndex = 0;

  _getDrawerItemWidget(int pos) {
    switch (pos) {
      case 0:
        return new MainFragment();
      case 1:
          return new CardMgmt();
}
}
}

CardMgmt and other classes in switch case have their own build method that will return a Widget and it will be place in body of your scaffold. Also they can be in the same dart file or even another file.
But I have another problem:
What to do if instead of drawer items, we have a button in another class like CardMgmt and we want it to return a Widget and update page?