Child widget

main.dart

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final counter = Provider.of<Counter>(context);
    return Scaffold(
      appBar: AppBar(
        title: Text("Provider Demo"),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '${counter.getCounter()}',
              style: Theme.of(context).textTheme.display1,
            ),
          ],
        ),
      ),
      floatingActionButton: Column(
        mainAxisAlignment: MainAxisAlignment.end,
        children: <Widget>[
          FloatingActionButton(
            onPressed: counter.increment,
            tooltip: 'Increment',
            child: Icon(Icons.add),
          ),
          SizedBox(height: 10),
          FloatingActionButton(
            onPressed: counter.decrement,
            tooltip: 'Increment',
            child: Icon(Icons.remove),
          )
        ],
      ),
    );
  }
}