A Draggable FAB wrapper widget which can dragged to any edge of the screen.

Add draggable_fab: ^0.1.1 in your pubspec.yaml dependencies. And import it:

import 'package:draggable_fab/draggable_fab.dart';

Create a standalone widget e.g. Floating Action Bar widget :

DraggableFab(
        child: FloatingActionButton(
          onPressed: _incrementCounter,
          child: Icon(Icons.add),
        ),
      );